ClearPath all-in-one servo: brushless servo motor, high resolution encoder, digital servo drive, and motion controller
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The first servo system affordable for all your motor needs.

Supremely Easy to Use Precise Control
User-friendly software lets you easily customize ClearPath for your specific needs. Controlling speed and position is done with simple digital signals or intuitive software commands. Don't be fooled by ClearPath's low price. It's a state-of-the-art, brushless servo system. Its closed-loop design gives you quiet and repeatable control of position, speed, and torque in any direction.
Versatile Simple Installation
Replace non-integrated servos, steppers, and AC induction motors up to 1.3 hp peak to get a low-cost, high-performance upgrade. With ClearPath's built-in controller and drive, there are no separate electronics to mount, and no bulky motor cable to route. Installation couldn't be easier.
ClearPath all-in-one brushless servo NEMA 23 and 34 sizes from 1/8 to 1.3 HP NEMA 23 ClearPath all-in-one brushless servo: integrated servo; drive, brushless motor, and motion controller NEMA 34 ClearPath all-in-one brushless servo: integrated servo; drive, brushless motor, and motion controller Rear side of ClearPath all-in-one brushless servo: heat sink allows for higher drive performance; USB allows simple set-up

* Try ClearPath risk-free for 3 months. Full refund if you're not 100% impressed!

ClearPath integrated servo motor, drive, and encoder, fit in your hand and have a 3 year warranty

Which ClearPath® series is right for you?

SD Series
Step & Direction
MC Series
Motion Control
SC Series
Software Control
ClearPath SD motors receive step and direction signals for near drop-in stepper and servo replacements ClearPath MC motors receive simple I/O from PLC’s, Arduinos, BeagleBone and other devices ClearPath SC motors receive motion commands from a C++ program; free, rich, intuitive C++ libraries for easy programming
Control with Step & Direction Control with Digital I/O Control with Software API
If you have a PLC, indexer, or a CNC controller with step & direction outputs, you can use ClearPath-SD to get servo-controlled performance in a compact, low-cost package.

ClearPath-SD is also an easy upgrade over stepper motors giving you smoother, quieter, and more precise closed-loop motion.
The MC-series is the easiest way to get high-performance motion control. Select one of ten operation modes, and control position, velocity, or torque with just simple digital signals.

Control with simple switches, sensors, or programmable devices like microcontrollers or PLCs.
Get full software control of ClearPath with the SC-series. Change motion parameters, capture encoder position, get diagnostic data, and more.

Rich, intuitive C++ library makes programming easy and efficient. Download for free.
Learn About SD Series Learn About MC Series Learn About SC Series

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 or potentiometers to manually set. You can also quickly save and recall set-ups for simple and reliable installations.

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. ClearPath will also servo lock to any desired position unlike AC motors.

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.

Regulatory Certifications: 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.

ClearPath stator laminations (left) are aligned in a partial helix to reduce torque ripple & cogging for smoother motion

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.

Winding end-turns are pressed tightly together for better thermal performance, are quiet, and reliable

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.

ClearPath uses rare-earth permanent NdFeB magnets (left); provides about 4 times the power of same sized AC induction motors

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.

ClearPath motors' sapphire-hard, anodized finish (left) won’t peal, flake, chip, fade, or discolor with time (unlike epoxy)

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.

ClearPath motor’s shaft diameter smooth transition (left) minimizes stress concentrations and increase side-load strength

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.

ClearPath motor’s feather keyway (left) doesn’t jam or vibrate loose (like Woodruff keys)

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.

ClearPath motor’s overlapping coils (left) enhance motor smoothness and power; reduces torque ripple, cogging, and detent

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.

ClearPath motor’s compression-fit, aluminum housing provides low-resistance path to cool the motor

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.

ClearPath motor's custom, brass balancing weights (left) are more precise and secure than balancing putty (right)

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.

ClearPath motor’s spring-tensioned, PTFE coated, Vitron shaft seal option improves dust and water protection

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 12,800 count per revolution 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. And you can query ClearPath-SC’s encoder position via software or capture position (with the advanced firmware option) on the fly.

Memory for downloaded programs To use ClearPath, you configure it to your desired mode of operation and then control it with: (1) digital I/O or switches and buttons (ClearPath-MC), (2) step & direction signals (ClearPath-SD), or (3) software commands from an external Windows or Linux CPU (ClearPath-SC). There’s enough built-in control capability to do some pretty sophisticated tasks (see the overview video), and with ClearPath-SC and C++, you can get virtually unlimited flexibility, but there’s no built-in memory to run stand-alone programs. 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).