All-in-One Systems

ClearPath-SD combines a step & direction vector servo drive, brushless servo motor, and high-resolution encoder into one compact package.

Two models are available: the SK model, which has 2-3 times the power of similar size stepper systems; and the HP model, which has 8-15 times the power of similar size steppers.

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ClearPath-SD

VS. STEPPERS AND OTHER DIGITAL SERVOS

ClearPath-SDSK Stepper Motors ClearPath-SDHP Other Digital Servos
3
ClearPath-SDSK servo systems have 2-3 times the power of similar sized steppers and cost less.
1
High inductance and high pole count causes torque to drop off rapidly with speed, leading to lower power output.
5
ClearPath-SDHP servo systems have 8-15 times the power of similar sized steppers, and more power than many similar sized servos due to the vector sinewave torque control and high energy rare-earth magnetics.
5
Most brushless servo systems have constant torque out to relatively high speed, which means lots of power.
5
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.
3
Generally pretty good, but degraded by a variety of factors: friction, inertia, static forces, temperature, detent torque, etc.
5
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.
4
Very good, although some servos hunt (dither) if they use high resolution encoders. Also encoder disk runout affects accuracy.
5
Servo systems can not lose steps or stall like stepper motor systems.
1
Stepper motor systems can lose position or stall if not designed with a large safety margin.
5
Servo systems can not lose steps or stall like stepper motor systems.
5
Servo systems can not lose steps or stall like stepper motor systems.
3
Servos have no resonant zones like steppes, and ClearPath-SDSK will apply a small amount of jerk-limiting (and jerk-derivative limiting) to help smooth out any imperfections in the motion profile output.
1
Steppers need to jump through speeds where they naturally resonate, which causes jerk on start and stop of motion.
5
Servos have no resonant zones like steppers, and ClearPath-SDHP will apply as much jerk-limiting (and jerk-derivative limiting) as required to reduce machine vibration and improve settling time.
3
Servos have no resonant zones like steppers. Smoothness of motion depends on the quality of the motion profile and tracking accuracy of the servo.
5
Brushless servo systems are generally much quieter than stepper systems, and ClearPath uses special techniques to futher reduce noise: vector AC commutation, skewed stator laminations, exterior rotor magnet design, oversized precision bearings, and others.
1
The large detent torque of steppers, and the way they operate, causes them to run noisy.
5
Brushless servo systems are generally much quieter than stepper systems, and ClearPath uses special techniques to futher reduce noise: vector AC commutation, skewed stator laminations, exterior rotor magnet design, oversized precision bearings, and others.
5
Brushless servo systems are generally much quieter than stepper systems.
5
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 100:1.
1
Steppers must be mechanically "tuned" to the load friction and inertia in order to work properly. Stepper performance can not be optimized with software.
5
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 100:1.
3
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.
4
Brushless servos systems general have much less vibration than stepper systems, and ClearPath further reduces vibration due to the vector chatter common to many servo systems that use acceleration feedforward and/or aggressive torque loop gains.
1
For the same reasons that steppers are noisy, they also create a substantial amount of high frequency vibration.
5
Brushless servos systems general have much less vibration than stepper systems, and ClearPath further reduces vibration due to the vector chatter common to many servo systems that use acceleration feedforward and/or aggressive torque loop gains.
4
Brushless servo systems generally have much less vibration than stepper systems.
5
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.
1
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.
5
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.
4
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.
5
The ClearPath-SD models priced below combine a brushless, permanent magnet servo motor, encoder, and vector sinewave drive with a step and direction interface, all in one compact package.
1
Expect to pay at least a $150 premium over the prices shown above to get an integrated stepper system (more with an encoder).
5
The ClearPath-SD models priced below combine a brushless, permanent magnet servo motor, encoder, and vector sinewave drive with a step and direction interface, all in one compact package.
2
Expect to pay at least a $200 premium over the prices shown below to get an integrated servo system (other than ClearPath).
ClearPath Servos vs.
Stepper Motors
Learn How to Implement
ClearPath-SD
Do you ever get frustrated with your stepper motor losing steps, but hesitate to buy a servo motor because you think they are too expensive or complicated? With this video, learn the differences between ClearPath-SD servo motors and stepper motors as we take an objective look at power, price, performance, and simplicity. In this video, we'll demonstrate key features of ClearPath-SD, including Teknic's proprietary "RAS"; technology, which improves motion profiles by converting them on the fly to ultra-smooth, jerk-limited and jerk-derivative-limited profiles. We'll also learn more about the differences between SDSK models and SDHP models.

Choose a ClearPath-SD Model


Both models share the same state-of-the-art servo performance.
Choose based on power and price.

SDSK Models
"Stepper Killer"
SDHP Models
High Power
Power Power
  • ▸  2-3 times the power of
    similar size steppers
  • ▸  8-15 times the power of
    similar size steppers
Price Price
  • ▸ 1-Piece: $257 & up
  • ▸ 100/year: $211 & up
  • ▸ 1-Piece: $492 & up
  • ▸ 100/year: $404 & up
Show Me SDSK Models Show Me SDHP Models
Show Me All SD Models