ClearPath

An Easy to Use, All-In-One Brushless Servo System

All-in-one Solution

ClearPath is a brushless servo motor, encoder, servo drive, and controller all rolled into one compact package.

Precise Control

State-of-the-art, closed-loop, AC vector servo gives you smooth, quiet and repeatable motion and control of position, speed & torque in any direction.

Supremely Easy to Use

Just connect power and two or three simple digital logic lines, and get precisely regulated speed control and smooth, accurate positioning.

Simple Installation

No separate drive to mount (and take up space). No bulky, expensive motor cable to route.

Versatile

Use ClearPath in place of steppers, AC induction motors, DC brush motors, and non-integrated servo motors up to 1.3 hp peak.

Reliable

ClearPath requires no maintenance, eliminates failure-
prone cables, and comes with an industry-leading 3-year warranty.

Great Prices

Single-piece prices start at $254 for a NEMA 23 brushless servo motor with integrated drive and
controller (2/3 hp peak power).
And significant volume discounts are available.

Risk-free

Try ClearPath for 90 days. Give it a full workout. If you're not happy for any reason, return it for a 100% refund.

The first brushless servo system
affordable enough for all your motor needs.

Prices Start at Only

$254(Qty. 1-9)

Which ClearPath® series is right for you?

ClearPath MC Series: Motion Controller Motion Controller

The MC series has a built-in motion controller that allows you to precisely control position, velocity, or torque using only simple digital inputs (switches, pushbuttons, PLC outputs, etc.).

  MC Series: Motion Controller Motion Controller

The SD series has a high-speed step & direction interface to allow it to be used with your motion controller as a drop-in replacement for stepper motor systems and digital servos.

Models      
Model Names Velocity ControllerVelocity Controller Position & VelocityPosition & Velocity   Stepper Killer"Stepper Killer" High PowerHigh Power
Price (Qty 1-9)

$254
to
$388

$314
to
$486

 

$257
to
$424

$492
to
$695

Integrated Components      
Brushless motor & optical encoder Checkmark Checkmark   Checkmark Checkmark
Vector AC servo drive Checkmark Checkmark   Checkmark Checkmark
Motion Controller Checkmark Checkmark   - -
Control Modes      
Precision, full-range velocity control Checkmark Checkmark   Checkmark1 Checkmark1
Position control (point to point) Limited Checkmark   Checkmark1 Checkmark1
Torque control mode Checkmark Checkmark   - -
Control with simple I/O Checkmark Checkmark   - -
Example Applications      
Point-to-point positioning systems Limited Checkmark   Checkmark Checkmark
Replace AC induction / VFD systems Checkmark CheckmarkShaft Seal   Limited Limited
Replace pneumatic cylinders Checkmark CheckmarkShaft Seal   Checkmark Checkmark
Drop-in replacement for stepper Limited Limited   CheckmarkShaft Seal CheckmarkShaft Seal
CNC contouring - -   Checkmark2 Checkmark2
  Find Out More About ClearPath-MC Models   Find Out More About ClearPath-SD Models
      1. Exact capabilities depend on your motion controller
2. Your motion controller must have CNC capability.
ClearPath MC Integrated servo with a motion controller

Control speed, position and torque with the built-in motion controller. Check out all 11 videos.

  1. Pulse Positioning

    4. Pulse Positioning
    VC
    Velocity Controller
    $254 to $388
    PV
    Position & Velocity
    $314 to $486
    Pulse Burst Positioning

    Use a timer/counter on your PLC (or a simple circuit) to send a burst of pulses to ClearPath, and it will move a distance proportional to the number of pulses sent, at your preselected speed and acceleration. This mode gives you most of the flexibility of a "step & direction" motion controller without the cost and added complexity.

    Checkmark
    Step and Direction

    This is for when you need a drop-in replacement for a stepper motor (with much higher power and performance) or a step & direction servo (at a fraction of the cost). Use a motion control indexer to send ClearPath step & direction inputs to precisely control speed and position.

    Use ClearPath-SD
  2. Torque Control

    3. Torque Control
    VC
    Velocity Controller
    $254 to $388
    PV
    Position & Velocity
    $314 to $486
    Follow Digital Torque Command

    Apply a variable torque (or force or tension) in proportion to a digital command (PWM or frequency)

    Checkmark Checkmark
  3. Speed Control

    2. Speed Control
    VC
    Velocity Controller
    $254 to $388
    PV
    Position & Velocity
    $314 to $486
    Ramp Up/Down to Selected Velocity

    By changing digital inputs (from your PLC, switches, etc.), ClearPath will smoothly ramp to one of four preset speeds in either direction.

    Checkmark Checkmark
    Manual Speed Control

    Fine control of speed from zero to max speed at the turn of a knob. Remembers your last set speed or resets to zero speed when motor is enabled.

    Checkmark Checkmark
    Spin on Power Up

    Just turn on power and smoothly ramp to your preset speed. For when all you need is reliable, constant speed from a brushless motor, and a bare minimum of wiring. It doesn't get any easier than this.

    Checkmark Checkmark
    Follow Digital Velocity Command

    Connect a digital waveform from your PLC or other device, and ClearPath will run at a speed proportional to the waveform. Or, connect the PWM output of an H-bridge drive of a DC brush motor setup to make a high-performance, drop-in replacement.

    Checkmark Checkmark
  4. Position Control

    1. Position Control
    VC
    Velocity Controller
    $254 to $388
    PV
    Position & Velocity
    $314 to $486
    Move to Sensor Position

    Trigger ClearPath to move in either direction and it will smoothly ramp up to a chosen speed and stop when it detects a sensor (or switch).

    Checkmark Checkmark
    Move to Absolute Position (2 positions)

    Trigger ClearPath to move to one of the two preset positions. Perfect for replacing air cylinders that move between two positions, but where more power and finesse is needed.

    Checkmark Checkmark
    Move to Absolute Position (4 positions)

    Trigger ClearPath to move to one of four preset positions. Perfect for replacing air cylinders where more power and finesse is needed, and you want to position at more than just two positions.

    Checkmark
    Move Incremental Distance

    Trigger ClearPath to move a user-defined distance (one of four) from its current position. You can also send multiple, quick trigger pulses to tell ClearPath to travel a multiple of any of its user-defined distances in one smooth move.

    Checkmark
ClearPath MC Integrated servo with step & direction interface

If you already have a motion indexer, but still want a brushless motor, encoder and drive all in one package.

  • Use your existing indexer and software: ClearPath-SD is a drop-in replacement for stepper motor systems and pulse input digital servo systems. No need to rewrite any software, or change from your preferred pulse output controller.
  • Power for faster machines: ClearPath-SD is available in two power classes - the "SK" model, which is 2 to 3 times the power of equal sized steppers and lower cost; and the "HP" model, which is modestly more expensive than equal size steppers, but 8 to 15 times more power, giving you a huge boost in throughput.
  • Servo performance: ClearPath-SD has the same state-of-the-art servo performance as other ClearPath models.
  • Great Prices: Whether you're replacing a stepper system to eliminate lost steps, and get quiet, smooth, faster motion, or you want to replace an existing digital servo with an all-in-one solution at a great price, there's a ClearPath-SD model for you.
SD Image
Easy Upgrade

Replace noisy, low performance steppers
Simply plug ClearPath-SDSK (or -SDHP) into your stepper's motion controller/indexer and immediately get servo performance and faster throughput.

Replace expensive, complicated digital servos
Easily replace your digital input servos with a ClearPath-SDHP drive/motor/encoder solution, and get state-of-the-art, brushless servo performance in a clean, all-in-one package.

ClearPath MC vs. steppers and other digital servos

Hover over each row to reveal details and notes

  Stepper Motors ClearPath-SD SK Other Digital Servos ClearPath-SD HP
Price Range (Qty. 1-9)

$277
to
$548

$257
to
$424

$645
to
$1195

$492
to
$695

Accuracy & Repeatability
No Lost Steps
Smoothness
Quietness
Vibration
Load Handling
Efficiency
Integrated Drive/Motor/Encoder
Power
Details/Notes
Details/Notes

Generally pretty good, but degraded by a variety of factors: friction, inertia, static forces, temperature, detent torque, etc.

Very good, and ClearPath's proprietary anti-hunt feature eliminates most hunting. Encoder disk runout is minimized by using a precision machined shaft, a zero runout disk mount design, and a fixed rear bearing.

Very good, although some servos hunt (dither) if they use high resolution encoders. Also encoder disk runout affects accuracy.

Very good, and ClearPath's proprietary anti-hunt feature eliminates most hunting. Encoder disk runout is minimized by using a precision machined shaft, a zero runout disk mount design, and a fixed rear bearing.

Details/Notes

Stepper motor systems can lose position or stall if not designed with a large safety margin.

Servo systems can not lose steps or stall like stepper motor systems.

Servo systems can not lose steps or stall like stepper motor systems.

Servo systems can not lose steps or stall like stepper motor systems.

Details/Notes

Steppers need to jump through speeds where they naturally resonate, which causes jerk on start and stop of motion.

Servos have no resonant zones like steppers, and ClearPath-SD SK will apply a small amount of jerk-limiting (and jerk-derivative limiting) to help smooth out any imperfections in the motion profile input.

Servos have no resonant zones like steppers. Smoothness of motion depends on the quality of the motion profile and tracking accuracy of the servo.

Servos have no resonant zones like steppers, and ClearPath-SD HP will apply as much jerk-limiting (and jerk-derivative limiting) as required to reduce machine vibration and improve settling time.

Details/Notes

The large detent torque of steppers, and the way they operate, causes them to run noisy.

Brushless servo systems are generally much quieter than stepper systems, and ClearPath uses special techniques to further reduce noise: vector AC commutation, skewed stator laminations, exterior rotor magnet design, oversized precision bearings, and others.

Brushless servo systems are generally much quieter than stepper systems.

Brushless servo systems are generally much quieter than stepper systems, and ClearPath uses special techniques to further reduce noise: vector AC commutation, skewed stator laminations, exterior rotor magnet design, oversized precision bearings, and others.

Details/Notes

For the same reasons that steppers are noisy, they also create a substantial amount of high frequency vibration.

Brushless servo systems generally have much less vibration than stepper systems, and ClearPath further reduces vibration due to the torque chatter common to many servo systems that use acceleration feedforward and/or aggressive torque loop gains.

Brushless servo systems generally have much less vibration than stepper systems.

Brushless servo systems generally have much less vibration than stepper systems, and ClearPath further reduces vibration due to the torque chatter common to many servo systems that use acceleration feedforward and/or aggressive torque loop gains.

Details/Notes

Steppers must be mechanically "tuned" to the load friction and inertia in order to work properly. Stepper performance can not be optimized with software.

ClearPath automatically optimizes itself for whatever load is connected. Numerous servo control innovations allow ClearPath to easily handle load-to-motor inertia mismatches of more than 150:1.

Servos can be tuned to be a wide range of loads, but most servo manufacturers recommend staying within a 10:1 load-to-motor inertia ratio for acceptable performance.

ClearPath automatically optimizes itself for whatever load is connected. Numerous servo control innovations allow ClearPath to easily handle load-to-motor inertia mismatches of more than 150:1.

Details/Notes

Steppers typically run with at least 50% of full current at all times even when running at constant velocity or standing still. This wastes a large amount of energy and causes steppers to run hot even with low loads.

Servos are energy efficient because (in theory) they only use current in proportion to the amount of torque needed. ClearPath uses resistance feedforward, back-EMF compensation and inductance cross-coupling to come very close to theoretical maximum efficiency. This means that very little energy is consumed when the motor is running at constant speed or at rest.

Servos are energy efficient because (in theory) they only use current in proportion to the amount of torque needed. Motor resistance, speed and inductance effects degrade theoretical efficiency.

Servos are energy efficient because (in theory) they only use current in proportion to the amount of torque needed. ClearPath uses resistance feedforward, back-EMF compensation and inductance cross-coupling to come very close to theoretical maximum efficiency. This means that very little energy is consumed when the motor is running at constant speed or at rest.

Details/Notes

Expect to pay at least a $150 premium over the prices shown above to get an integrated stepper system (more with an encoder).

The ClearPath SD models priced above combine a brushless, permanent magnet servo motor, encoder and vector sinewave drive with a step and direction interface, all in one compact package.

Expect to pay at least a $200 premium over the prices shown above to get an integrated servo system (other than ClearPath).

The ClearPath SD models priced above combine a brushless, permanent magnet servo motor, encoder and vector sinewave drive with a step and direction interface, all in one compact package.

Details/Notes

High inductance and high pole count design causes torque to drop off rapidly with speed, leading to low power output.

ClearPath-SD SK servo systems have 2-3 times the power of similar sized steppers and cost less.

Most brushless servo systems have constant torque out to relatively high speed which means lots of power.

ClearPath-SD HP servo systems have 8-15 times the power of similar sized steppers, and more power than many similar sized servos due to their vector sinewave torque control and high energy rare-earth magnetics.

Details/Notes

Typical single-piece price for NEMA 23-34 non-integrated stepper systems (without encoders) and one-third to one-half the shaft power of a ClearPath-SD SK brushless servo.

Single-piece prices for the range of available ClearPath motor sizes. Significant volume discounts are available.

Typical single-piece price for NEMA 23-34 non-integrated brushless servo systems and about the same shaft power of a ClearPath-SD HP model.

Single-piece prices for the range of available ClearPath motor sizes. Significant volume discounts are available.

ClearPath

The first servo system you can afford to use in any motor control application.

Do the research and see for yourself. You won't find anything at this price that compares to ClearPath in terms of power, performance, and quality.

ClearPath is the clear choice.

Ready to Get Started?

Prices Start at Only

$254(Qty. 1-9)

More User Benefits

Set Up Via USB
With a standard USB port and cable you can configure ClearPath and use its diagnostic tools. There are no switches, potentiometers, or jumpers to manually set. You can also quickly save and recall set-ups for simple and reliable installations.

Configurable Status Output
By using ClearPath's "HLFB" (High Level Feedback) output you can get rich status information by reading just one bit. For example, HLFB can tell you when you have reached your target position (within a user-defined tolerance) and have been settled at that position for a specified amount of time. You can also set the HLFB to control a brake, provide speed feedback, and more.

RAS™ Jerk Limiting Technology
RAS Jerk Limiting TechnologyTeknic uses a proprietary algorithm in all of its products that can convert traditional motion profiles into profiles that are jerk limited and jerk-derivative limited. This makes the motion ultra-smooth, resulting in quieter, cooler operation, and longer life for mechanical parts.

User-definable Global Torque Limiting
You can adjust each ClearPath motor to limit its maximum torque to protect your mechanics.

Automatic Torque Foldback
In some cases, you want to use full torque except at certain times, for example, to clamp or insert something, or when you encounter an obstacle or hard stop. ClearPath can be set up to automatically limit the torque (to a value different from the global torque limit) in these situations and more. You can also use this feature to gently move into a hard stop to set a home position without using a home sensor.

Hold Position with No Drift
Even in vertical applications, when subjected to external forces, ClearPath will accurately hold its commanded position.

Runs Smoothly at Low (or Zero) Speed
Unlike AC motors and stepper motors, ClearPath's vector servo control allows it to run smoothly at all speeds, and to lock into position when commanded to go zero speed.

Power Density
Compared to AC induction motors and non-integrated servo motors, ClearPath has 3 to 5 times the shaft power per cubic inch of space. Its rare earth, Neodymium-Iron-Boron permanent magnets and 200ºC-rated winding insulation means that ClearPath can be pushed hard without worry.

Dynamic Braking
ClearPath can be configured to use its regenerated enegy as a source to stop its own motion in cases where the motor is disabled by the user or if it shuts down due to an error condition.

Helpful Diagnostics
Helpful DiagnosticsYou can use ClearPath's powerful scope function to measure performance and debug problems. You can clearly view motion profiles, torque usage, tracking accuracy, voltage headroom, and many other important variables. Separate strip chart traces show exception events (like torque saturation, voltage saturation, speed limits, shutdowns, etc.) time-aligned with the data shown on the scope.

Brush Motor Replacement Mode
You can connect ClearPath MC models directly to the H-bridge outputs of a brush motor amplifier to use it as a drop-in replacement for brush motors. ClearPath SD models are powerful replacements for brush motors used with digital input servos.

Wide Range of Input Power (24-75 VDC)
ClearPath runs off a wide range of DC voltages. Running off of these relatively low DC voltages is safer than running motors off of AC line voltages and causes less electrical noise. Also ClearPath does not need a regulated supply. It does its own regulation so you can use an inexpensive bulk power supply (like the E3PS12-75 or SSt-EMF75).

Regulatory Certifications (pending): UL, CE, RoHS

Regulatory Certifications

No Maintenance Ever
The only components in ClearPath that are subject to wear are the shaft bearings. That's why we only use sealed, permanently lubricated bearings, and over-size them for extra design margin. In most applications, the average lifetime for the front bearing is expected to be more than 25 billion revolutions. At 1,000 RPM, running 24 hours a day, that's almost 50 years!

Advanced Technology, Yet Easy to Use

Despite it being widely accepted that top-quality servo-controlled systems deliver the best motion performance across the board, the complexity and cost of servos have made users reluctant to use them except for the most demanding applications. You've read to this point, so you know ClearPath has solved the cost issue, but what about servo complexity?

ClearPath is simplicity itself. If you can understand these equations, you can use ClearPath:

Equation

Just kidding.

Thankfully, we have people that deal with stuff like this, so the rest of us don't have to. Teknic's R&D team has worked hard to take the best control technology from our high-end OEM products, combine it with some truly innovative new technology, and wrap it in a system that makes all that complexity completely transparent to you.

Innovations

Adaptive Position Error Compensation:
Unlike servos using common control strategies like PID in which the response to position error is in simple proportion to the error, ClearPath uses a non-linear, adaptive control algorithm that automatically and dynamically adjusts its response to current performance in real time.

Automatic High Inertia Compensation:
Most servo manufacturers recommend load inertias of no more than 10 to 20 times the motor's inertia to avoid servo ringing, instability, and low stiffness. ClearPath's IMT (Inertia Matching Technology) automatically compensates for the effects of large inertial mismatch allowing you to use smaller motors and less gearing. Our customers regularly build systems with inertial mismatches of more than 100 to 1 using Teknic products with the IMT feature.

Automatic Sensor Calibration:
Servo systems can exhibit erratic performance when critical current feedback sensors drift over time and temperature. If you can't measure the controlled variable accurately, you can't control it very well. ClearPath uses proprietary circuitry and firmware to continuously minimize the effects of sensor inaccuracies.

Automatic Anti-hunting Protection:
This feature allows ClearPath to have high stiffness and disturbance rejection yet minimal hunting (i.e., the tendency for servos to constantly dither 1 or 2 encoder counts when they should be sitting still).

Automatic Resonance Detection/Avoidance:
All mechanical systems have resonant frequencies. If there are any significant resonances within the bandwidth of a typical servo system connected to the mechanics, the servo may become unstable (or, at a minimum, make loud, unpleasant sounds much like what happens when you put a microphone too close to its loudspeaker). ClearPath automatically detects and compensates for low, medium and high frequency system resonances.

Automatic Input Voltage Regulation:
ClearPath's vector torque compensator automatically compensates for fluctuations in your DC bus power supply. This means you can use an inexpensive unregulated power supply to power ClearPath, and you don't have to worry about typical AC line fluctuations causing performance problems.

Quality, Ruggedness and Reliability

It's probably obvious that the fully integrated design of ClearPath, by its very nature, will increase the ruggedness and reliability of your system. The most failure-prone element in all motion systems—the cabling—has been greatly reduced. In fact, the motor-drive cable, the most complex and troublesome cable, is altogether eliminated. But ClearPath has numerous design features, beyond the integration of the motor, encoder, drive and controller, that further enhance reliability. Read on to see how quality and reliability has been designed into every aspect of ClearPath, and you'll see why we're able to provide the longest warranty in the industry.

Motor Design and Construction Features
Every component in the construction of ClearPath motors has been carefully engineered using the highest quality materials, design, and manufacturing processes.

The rare-earth magnets are fully sintered, not bonded together with plastic; the wire insulation exceeds Class H temperature specs; the finish is anodized, not painted or raw; the extra-large bearings are permanently sealed; and more. Browse through the photos below which show the internal construction, and see for yourself.

Helical stator design provides smoother motion

ClearPath stator laminations (left) are aligned in a partial helix rather than straight up and down to reduce torque ripple and cogging. This results in better velocity regulation, less vibration, better dynamic servo control, and less servo hunting.

Helical

Pressed and laced end turns are quiet and reliable

Winding end-turns are pressed tightly together and laced to form a nearly solid mass of copper for better thermal performance. Tightly packed wires vibrate less as current flow changes, so they are audibly quieter and their insulation doesn't abrade and fail over time.

Helical

Powerful rare-earth permanent magnets generate maximum power

"Bonded" neodymium ring magnets (right) are made by mixing NdFeB powder with a plastic resin. ClearPath uses magnets made of virtually pure NdFeB that has been "sintered" into solid bricks (left). These sintered magnets are extremely powerful compared to the plastic bonded magnets. AC induction motors, which use electromagnets rather than permanent magnets, only have about 25% as much power as ClearPath for the same size motor.

Helical

Hard anodized finish is rugged and doesn't peel or flake

The sapphire-hard, anodized finish on ClearPath motors (left) resists scratches much better than paint or epoxy (right), and won't ever peel, flake or chip. The heat-stable, inorganic black dye is integral to the finish, and gives ClearPath a rich, metallic look that will not fade or discolor over time.

Hard Anodized Finish

Precision machined shaft allows higher side loading

The shaft diameter transition in all ClearPath motors is smoothly radiused. Motor shafts with abrupt diameter transitions (right) have severe internal stress concentrations that can cause their shafts to break when side-loaded.

Precision Machined

Feather-style keyway doesn't jam or vibrate loose

Feather keys are fully contained in the shaft so they can't come loose, they don't rock and get jammed like Woodruff keys or shift axially like square and flat keys, and their curved ends guide the key into the keyway for easy assembly.

Feater-style Keyway

Overlapping coils further enhance motor smoothness and power

Compared to the common and simple one-coil-per-tooth stators (right), ClearPath stators (left) use an overlapping, alternate-slot fill pattern with two coil sections per slot. This reduces torque ripple, cogging, and detent torque, improves electrical responsiveness, and increases power output.

Overlapping Coils

Compression-fit housing helps cool the motor

ClearPath has a compression fit, aluminum housing surrounding the stator that provides a low-resistance path to conduct heat out of the motor and into the mounting suface (which typically acts as a big heat sink). This increases continuous power output and improves reliability. Many motors have no housing (exposed laminations) and so have a poor heat path to the mounting surface.

Compression Fit

Individually custom-balanced rotors reduce vibration and fatigue

ClearPath's custom-made, brass balancing weights (left) are more precise and secure than common balancing putty (right). The weight is held captive by the shaft (under the bearing) so that it can not come loose like balancing putty often does.

Custom Balance

IP65 Protection rating means no worries about dust and waterspray

For extra protection beyond ClearPath's close-tolerance, closed mechanical design, an optional dynamic shaft seal is available. ClearPath's high quality shaft seal is spring tensioned, has a Viton® lip for minimal compression set and excellent high temperature properties, and a PTFE coating for low friction and wear. It also has a metal outer case for greater structural rigidity, and a Viton® outer coating for a better OD seal and more tolerance to thermal expansion differentials.

Shaft Seal (TEKN-Mtr-0229-WG)

Drive and Motor Protection Features: Rugged design and construction is great for long life under tough conditions, but ClearPath also has many features that protect it from mishaps that might cause immediate death for other motors—reversed wiring, shorted inputs or outputs, voltage overloads, mechanical jams, etc. Here are some of the protection features built into every ClearPath motor:

  • Input Protection: ClearPath’s control inputs are all optically isolated, and protected against damage from accidental reverse polarity wiring. They are also capable of sustaining a continuous overvoltage condition of up to 30 volts DC.
  • Output Protection: ClearPath’s digital output will comfortably survive a sustained or repetitive direct short circuit. It is also capable of handling accidental reverse polarity wiring (up to 1 amp of reverse current).
  • Operational Protection: Sometimes things go wrong in a motion system. The mechanics jam, the software or operator sets too high a speed or acceleration, the power supply drops out, and so on. ClearPath motors will reliably protect themselves against damage in these situations and more.
  • A built-in thermal sensor keeps the electronics well within their safe operating temperature, and also ensures that the motor windings stay a full 65ºC below their rated maximum temperature of 200ºC (most motor windings are only rated for 135-155ºC).
  • ClearPath will protectively shutdown if it can’t follow your motion command as closely as expected. (For example, if the mechanics jam, or the operator sets too high a speed.)
  • If the average torque load exceeds the maximum capability of the motor, ClearPath will safely shut down. so there’s no need to worry about burning up a motor when something goes wrong with the mechanics.

In all these shutdown situations, ClearPath will dynamically brake the moving load. Other motors just freewheel when they shut down, allowing your mechanics to crash.

Production Quality and Warranty
Every single ClearPath motor receives a full suite of in-line and post-production tests to assure you of the highest incoming quality. This includes testing for:

  • Electromagnetic performance
  • Magnet field strength
  • Encoder integrity
  • Rotor balance
  • Commutation sensor accuracy
  • Critical mechanical tolerances
  • Insulation system (hipot)
  • Complete functional test
  • HASS (Highly Accelerated Stress Screening) to test each motor beyond its published specifications
Three Year Warranty

Unsurpassed Warranty
ClearPath is warranted to be free from defects in material and workmanship for a full three years. These systems are built to last.

You may be wondering...

...how we're able to offer an industrial-quality, state-of-the-art, complete servo system at prices that compete with DC brush and AC induction motor systems. Well, frankly, one of the ways we achieved ClearPath’s low price was by simply leaving out certain features. To help us decide what to leave out, we consulted a large number of our most experienced users, and asked them which features they'd miss the least. If the features were costly, we just left them out. Doing this, we may have made ClearPath a little less attractive for some applications, but it means now you can use a servo system where you could never afford to before.
Read what we left out.

General purpose I/O. ClearPath’s I/O is dedicated to control its own functions. If you need I/O for other machine functions, you’ll need to use the I/O from another source (e.g., your PLC or a GPIO card).

Encoder output connector. Being a servo, ClearPath uses an integrated encoder to maintain accurate position and velocity, but we reduced cost and space (and got rid of potential noise problems) by not running the encoder signals to the outside world. ClearPath does have a digital status output, however, to tell you when moves are done or target speeds are reached.

Network interface. There’s no CAN bus, no etherCAT, no Profibus, etc. because we didn’t want to add a network interface and its associated hardware. ClearPath is more like a traditional stepper or servo drive in this sense. If you want to control ClearPath via a network, you’ll have to control it with networked I/O (e.g., your PLC)

Memory for downloaded programs To use ClearPath, you configure it to your desired mode of operation and then control it with digital I/O or step & direction signals (or even switches and buttons). There’s enough built-in control capability to do some pretty sophisticated tasks (see the overview video) but for any “if-then” sort of functionality, you’ll have to use the capabilities of your PC or PLC. But at least you won’t have to learn a new programming language.

Of course, we did a lot more to reduce cost than just leave out a few features.
Here are the biggest reasons that ClearPath can offer high quality and high performance at such a low price:

  • Innovative firmware takes the place of expensive hardware. We use advanced firmware algorithms—some newly developed, and many borrowed from our other high-performance products—to greatly reduce hardware cost (and provide better servo performance at the same time).
  • Economies of scale reduce cost and improve lead time. ClearPath benefits from economies of scale because it uses many of the same components and production systems as Teknic’s popular Hudson motor line.
  • Integration eliminates even more hardware. Integrating everything into one package was a tough design challenge, but it got rid of connectors, cables, circuit boards, and cases…and a whole lot of cost.
  • You buy directly from Teknic. With ClearPath, there are no middlemen. You save the 30-40% markup that typically goes to distributors. You won’t have a local sales guy, but on the other hand, you’ll get your technical support directly from the experts on the product (that’s us).

More Benefits

More User Benefits

Set Up Via USB
With a standard USB port and cable you can configure ClearPath and use its diagnostic tools. There are no switches, potentiometers, or jumpers to manually set. You can also quickly save and recall set-ups for simple and reliable installations.

Configurable Status Output
By using ClearPath's "HLFB" (High Level Feedback) output you can get rich status information by reading just one bit. For example, HLFB can tell you when you have reached your target position (within a user-defined tolerance) and have been settled at that position for a specified amount of time. You can also set the HLFB to control a brake, provide speed feedback, and more.

RAS™ Jerk Limiting Technology
RAS Jerk Limiting TechnologyTeknic uses a proprietary algorithm in all of its products that can convert traditional motion profiles into profiles that are jerk limited and jerk-derivative limited. This makes the motion ultra-smooth, resulting in quieter, cooler operation, and longer life for mechanical parts.

User-definable Global Torque Limiting
You can adjust each ClearPath motor to limit its maximum torque to protect your mechanics.

Automatic Torque Foldback
In some cases, you want to use full torque except at certain times, for example, to clamp or insert something, or when you encounter an obstacle or hard stop. ClearPath can be set up to automatically limit the torque (to a value different from the global torque limit) in these situations and more. You can also use this feature to gently move into a hard stop to set a home position without using a home sensor.

Hold Position with No Drift
Even in vertical applications, when subjected to external forces, ClearPath will accurately hold its commanded position.

Runs Smoothly at Low (or Zero) Speed
Unlike AC motors and stepper motors, ClearPath's vector servo control allows it to run smoothly at all speeds, and to lock into position when commanded to go zero speed.

Power Density
Compared to AC induction motors and non-integrated servo motors, ClearPath has 3 to 5 times the shaft power per cubic inch of space. Its rare earth, Neodymium-Iron-Boron permanent magnets and 200ºC-rated winding insulation means that ClearPath can be pushed hard without worry.

Dynamic Braking
ClearPath can be configured to use its regenerated enegy as a source to stop its own motion in cases where the motor is disabled by the user or if it shuts down due to an error condition.

Helpful Diagnostics
Helpful DiagnosticsYou can use ClearPath's powerful scope function to measure performance and debug problems. You can clearly view motion profiles, torque usage, tracking accuracy, voltage headroom, and many other important variables. Separate strip chart traces show exception events (like torque saturation, voltage saturation, speed limits, shutdowns, etc.) time-aligned with the data shown on the scope.

Brush Motor Replacement Mode
You can connect ClearPath MC models directly to the H-bridge outputs of a brush motor amplifier to use it as a drop-in replacement for brush motors. ClearPath SD models are powerful replacements for brush motors used with digital input servos.

Wide Range of Input Power (24-75 VDC)
ClearPath runs off a wide range of DC voltages. Running off of these relatively low DC voltages is safer than running motors off of AC line voltages and causes less electrical noise. Also ClearPath does not need a regulated supply. It does its own regulation so you can use an inexpensive bulk power supply (like the E3PS12-75 or SSt-EMF75).

Regulatory Certifications (pending): UL, CE, RoHS

Regulatory Certifications

No Maintenance Ever
The only components in ClearPath that are subject to wear are the shaft bearings. That's why we only use sealed, permanently lubricated bearings, and over-size them for extra design margin. In most applications, the average lifetime for the front bearing is expected to be more than 25 billion revolutions. At 1,000 RPM, running 24 hours a day, that's almost 50 years!

Servo Technology

Advanced Technology, Yet Easy to Use

Despite it being widely accepted that top-quality servo-controlled systems deliver the best motion performance across the board, the complexity and cost of servos have made users reluctant to use them except for the most demanding applications. You've read to this point, so you know ClearPath has solved the cost issue, but what about servo complexity?

ClearPath is simplicity itself. If you can understand these equations, you can use ClearPath:

Equation

Just kidding.

Thankfully, we have people that deal with stuff like this, so the rest of us don't have to. Teknic's R&D team has worked hard to take the best control technology from our high-end OEM products, combine it with some truly innovative new technology, and wrap it in a system that makes all that complexity completely transparent to you.

Innovations

Adaptive Position Error Compensation:
Unlike servos using common control strategies like PID in which the response to position error is in simple proportion to the error, ClearPath uses a non-linear, adaptive control algorithm that automatically and dynamically adjusts its response to current performance in real time.

Automatic High Inertia Compensation:
Most servo manufacturers recommend load inertias of no more than 10 to 20 times the motor's inertia to avoid servo ringing, instability, and low stiffness. ClearPath's IMT (Inertia Matching Technology) automatically compensates for the effects of large inertial mismatch allowing you to use smaller motors and less gearing. Our customers regularly build systems with inertial mismatches of more than 100 to 1 using Teknic products with the IMT feature.

Automatic Sensor Calibration:
Servo systems can exhibit erratic performance when critical current feedback sensors drift over time and temperature. If you can't measure the controlled variable accurately, you can't control it very well. ClearPath uses proprietary circuitry and firmware to continuously minimize the effects of sensor inaccuracies.

Automatic Anti-hunting Protection:
This feature allows ClearPath to have high stiffness and disturbance rejection yet minimal hunting (i.e., the tendency for servos to constantly dither 1 or 2 encoder counts when they should be sitting still).

Automatic Resonance Detection/Avoidance:
All mechanical systems have resonant frequencies. If there are any significant resonances within the bandwidth of a typical servo system connected to the mechanics, the servo may become unstable (or, at a minimum, make loud, unpleasant sounds much like what happens when you put a microphone too close to its loudspeaker). ClearPath automatically detects and compensates for low, medium and high frequency system resonances.

Automatic Input Voltage Regulation:
ClearPath's vector torque compensator automatically compensates for fluctuations in your DC bus power supply. This means you can use an inexpensive unregulated power supply to power ClearPath, and you don't have to worry about typical AC line fluctuations causing performance problems.

Quality/Reliability

Quality, Ruggedness and Reliability

It's probably obvious that the fully integrated design of ClearPath, by its very nature, will increase the ruggedness and reliability of your system. The most failure-prone element in all motion systems—the cabling—has been greatly reduced. In fact, the motor-drive cable, the most complex and troublesome cable, is altogether eliminated. But ClearPath has numerous design features, beyond the integration of the motor, encoder, drive and controller, that further enhance reliability. Read on to see how quality and reliability has been designed into every aspect of ClearPath, and you'll see why we're able to provide the longest warranty in the industry.

Motor Design and Construction Features
Every component in the construction of ClearPath motors has been carefully engineered using the highest quality materials, design, and manufacturing processes.

The rare-earth magnets are fully sintered, not bonded together with plastic; the wire insulation exceeds Class H temperature specs; the finish is anodized, not painted or raw; the extra-large bearings are permanently sealed; and more. Browse through the photos below which show the internal construction, and see for yourself.

Helical stator design provides smoother motion

ClearPath stator laminations (left) are aligned in a partial helix rather than straight up and down to reduce torque ripple and cogging. This results in better velocity regulation, less vibration, better dynamic servo control, and less servo hunting.

Helical

Pressed and laced end turns are quiet and reliable

Winding end-turns are pressed tightly together and laced to form a nearly solid mass of copper for better thermal performance. Tightly packed wires vibrate less as current flow changes, so they are audibly quieter and their insulation doesn't abrade and fail over time.

Helical

Powerful rare-earth permanent magnets generate maximum power

"Bonded" neodymium ring magnets (right) are made by mixing NdFeB powder with a plastic resin. ClearPath uses magnets made of virtually pure NdFeB that has been "sintered" into solid bricks (left). These sintered magnets are extremely powerful compared to the plastic bonded magnets. AC induction motors, which use electromagnets rather than permanent magnets, only have about 25% as much power as ClearPath for the same size motor.

Helical

Hard anodized finish is rugged and doesn't peel or flake

The sapphire-hard, anodized finish on ClearPath motors (left) resists scratches much better than paint or epoxy (right), and won't ever peel, flake or chip. The heat-stable, inorganic black dye is integral to the finish, and gives ClearPath a rich, metallic look that will not fade or discolor over time.

Hard Anodized Finish

Precision machined shaft allows higher side loading

The shaft diameter transition in all ClearPath motors is smoothly radiused. Motor shafts with abrupt diameter transitions (right) have severe internal stress concentrations that can cause their shafts to break when side-loaded.

Precision Machined

Feather-style keyway doesn't jam or vibrate loose

Feather keys are fully contained in the shaft so they can't come loose, they don't rock and get jammed like Woodruff keys or shift axially like square and flat keys, and their curved ends guide the key into the keyway for easy assembly.

Feater-style Keyway

Overlapping coils further enhance motor smoothness and power

Compared to the common and simple one-coil-per-tooth stators (right), ClearPath stators (left) use an overlapping, alternate-slot fill pattern with two coil sections per slot. This reduces torque ripple, cogging, and detent torque, improves electrical responsiveness, and increases power output.

Overlapping Coils

Compression-fit housing helps cool the motor

ClearPath has a compression fit, aluminum housing surrounding the stator that provides a low-resistance path to conduct heat out of the motor and into the mounting suface (which typically acts as a big heat sink). This increases continuous power output and improves reliability. Many motors have no housing (exposed laminations) and so have a poor heat path to the mounting surface.

Compression Fit

Individually custom-balanced rotors reduce vibration and fatigue

ClearPath's custom-made, brass balancing weights (left) are more precise and secure than common balancing putty (right). The weight is held captive by the shaft (under the bearing) so that it can not come loose like balancing putty often does.

Custom Balance

Precision fit components means no worries about dust and water splashes

For extra protection beyond ClearPath's close-tolerance, closed mechanical design, an optional dynamic shaft seal is available. ClearPath's high quality shaft seal is spring tensioned, has a Viton® lip for minimal compression set and excellent high temperature properties, and a PTFE coating for low friction and wear. It also has a metal outer case for greater structural rigidity, and a Viton® outer coating for a better OD seal and more tolerance to thermal expansion differentials.

Shaft Seal (TEKN-Mtr-0229-WG)

Drive and Motor Protection Features: Rugged design and construction is great for long life under tough conditions, but ClearPath also has many features that protect it from mishaps that might cause immediate death for other motors—reversed wiring, shorted inputs or outputs, voltage overloads, mechanical jams, etc. Here are some of the protection features built into every ClearPath motor:

  • Input Protection: ClearPath’s control inputs are all optically isolated, and protected against damage from accidental reverse polarity wiring. They are also capable of sustaining a continuous overvoltage condition of up to 30 volts DC.
  • Output Protection: ClearPath’s digital output will comfortably survive a sustained or repetitive direct short circuit. It is also capable of handling accidental reverse polarity wiring (up to 1 amp of reverse current).
  • Operational Protection: Sometimes things go wrong in a motion system. The mechanics jam, the software or operator sets too high a speed or acceleration, the power supply drops out, and so on. ClearPath motors will reliably protect themselves against damage in these situations and more.
  • A built-in thermal sensor keeps the electronics well within their safe operating temperature, and also ensures that the motor windings stay a full 65ºC below their rated maximum temperature of 200ºC (most motor windings are only rated for 135-155ºC).
  • ClearPath will protectively shutdown if it can’t follow your motion command as closely as expected. (For example, if the mechanics jam, or the operator sets too high a speed.)
  • If the average torque load exceeds the maximum capability of the motor, ClearPath will safely shut down. so there’s no need to worry about burning up a motor when something goes wrong with the mechanics.

In all these shutdown situations, ClearPath will dynamically brake the moving load. Other motors just freewheel when they shut down, allowing your mechanics to crash.

Production Quality and Warranty
Every single ClearPath motor receives a full suite of in-line and post-production tests to assure you of the highest incoming quality. This includes testing for:

  • Electromagnetic performance
  • Magnet field strength
  • Encoder integrity
  • Rotor balance
  • Commutation sensor accuracy
  • Critical mechanical tolerances
  • Insulation system (hipot)
  • Complete functional test
  • HASS (Highly Accelerated Stress Screening) to test each motor beyond its published specifications
Three Year Warranty

Unsurpassed Warranty
ClearPath is warranted to be free from defects in material and workmanship for a full three years. These systems are built to last.

So, What's the Catch?

You may be wondering...

...how we're able to offer an industrial-quality, state-of-the-art, complete servo system at prices that compete with DC brush and AC induction motor systems. Well, frankly, one of the ways we achieved ClearPath’s low price was by simply leaving out certain features. To help us decide what to leave out, we consulted a large number of our most experienced users, and asked them which features they'd miss the least. If the features were costly, we just left them out. Doing this, we may have made ClearPath a little less attractive for some applications, but it means now you can use a servo system where you could never afford to before.
Read what we left out.

General purpose I/O. ClearPath’s I/O is dedicated to control its own functions. If you need I/O for other machine functions, you’ll need to use the I/O from another source (e.g., your PLC or a GPIO card).

Encoder output connector. Being a servo, ClearPath uses an integrated encoder to maintain accurate position and velocity, but we reduced cost and space (and got rid of potential noise problems) by not running the encoder signals to the outside world. ClearPath does have a digital status output, however, to tell you when moves are done or target speeds are reached.

Network interface. There’s no CAN bus, no etherCAT, no Profibus, etc. because we didn’t want to add a network interface and its associated hardware. ClearPath is more like a traditional stepper or servo drive in this sense. If you want to control ClearPath via a network, you’ll have to control it with networked I/O (e.g., your PLC)

Memory for downloaded programs To use ClearPath, you configure it to your desired mode of operation and then control it with digital I/O or step & direction signals (or even switches and buttons). There’s enough built-in control capability to do some pretty sophisticated tasks (see the overview video) but for any “if-then” sort of functionality, you’ll have to use the capabilities of your PC or PLC. But at least you won’t have to learn a new programming language.

Of course, we did a lot more to reduce cost than just leave out a few features.
Here are the biggest reasons that ClearPath can offer high quality and high performance at such a low price:

  • Innovative firmware takes the place of expensive hardware. We use advanced firmware algorithms—some newly developed, and many borrowed from our other high-performance products—to greatly reduce hardware cost (and provide better servo performance at the same time).
  • Economies of scale reduce cost and improve lead time. ClearPath benefits from economies of scale because it uses many of the same components and production systems as Teknic’s popular Hudson motor line.
  • Integration eliminates even more hardware. Integrating everything into one package was a tough design challenge, but it got rid of connectors, cables, circuit boards, and cases…and a whole lot of cost.
  • You buy directly from Teknic. With ClearPath, there are no middlemen. You save the 30-40% markup that typically goes to distributors. You won’t have a local sales guy, but on the other hand, you’ll get your technical support directly from the experts on the product (that’s us).

ClearPath Volume Discount Policy

Teknic allows you to accumulate the purchases you make via our web store over time in order to earn quantity discounts. We will keep track of your purchases in each product family (described below) over a continuously running twelve month period and always offer you the prices that correspond to your accumulated quantity.

We accumulate quantities separately for each of these product families: ClearPath motors, Power Supplies, and Cables. We offer additional discounts for each family when your purchases over the last twelve months for that family reach the following quantities: 10, 50, 100, 200 and several higher volume points.

All product pages on this site will show volume pricing after you fill out a short registration form.

ClearPath Qualified OEM Program

If you’re a large OEM and expect to purchase at least $50,000 of Teknic products per year, we may designate you a “Qualified OEM” which means you can purchase directly through Teknic’s OEM sales group as well as via the web store. This can provide more order and shipping flexibility, as well as potentially better pricing, and a dedicated account manager. Contact Teknic for further details.