Cymotorix, a China motor driver manufacturer and supplier, provides motor drivers matched to our own motor range — stepper motor drivers for the 2-phase, 3-phase, and closed-loop lines, and servo motor drivers for the AC servo range. The point of buying the driver with the motor is that we size and tune the pair before it ships: drive current, microstepping, and gain settings are set up for the specific motor, so you get a working set rather than two parts to commission. Stepper drivers support selectable microstepping for smooth low-speed motion; servo drives run position, speed, and torque modes over pulse or bus communication. The sections below break the range down by driver type.
Stepper motor drivers and servo drives matched to our full motor range, from NEMA 8 steppers to 5.5kW AC servos.
Microstepping support for smooth low-speed motion, with switch- or software-selectable step resolutions on the stepper line.
Servo drives run position, speed, and torque modes, with pulse/direction, RS485, CANopen, or EtherCAT communication.
Stepper motor and driver, or servo and drive, supplied and tested as a set, so current, microstepping, and tuning are sorted before delivery.
We build three main types of stepper motors — 2-phase, 3-phase, and closed loop. The 2-phase hybrid is our highest-volume product, covering NEMA 8 through NEMA 42. If your application needs lower vibration at higher speeds, go with 3-phase. If you need position feedback and anti-lost-step protection, the closed loop series is the right fit.
| Stepper Driver | Closed Loop Driver | Servo Drive | |
|---|---|---|---|
| CONTROL | Open loop | Closed loop (encoder) | Closed loop (encoder) |
| DRIVES | 2/3-phase steppers | Closed loop steppers | AC servo motors |
| STEP / MICROSTEP | Yes, selectable | Yes, with feedback | Continuous |
| MODES | Pulse/direction | Pulse/direction | Position / speed / torque |
| BEST FOR | Low-cost positioning | Anti-lost-step | High speed, high dynamics |
· Stepper drivers for 2-phase, 3-phase, and closed-loop motors
· Servo drives and brushless motor drivers for the AC servo range, up to 5.5kW
· Microstepping on the stepper line for smooth low-speed motion
· Matched and tuned to the motor before shipping
· Drive current matched to motor rated current with headroom
· Bus voltage chosen to hold high-speed torque
· Microstepping set for the smoothest motion the motor allows
· Over-current, over-voltage, and over-temperature protection
· Open-loop stepper driver: pulse/direction, selectable microstepping
· Closed loop stepper driver: reads the encoder, corrects lost steps
· Servo drive: position, speed, torque modes
· Communication: pulse/direction, RS485, CANopen, EtherCAT
· Current and microstepping set per motor
· Servo commutation, gain, and inertia matching pre-tuned
· Wiring diagram and pinout shipped with the set
· Custom communication or voltage on request
Stepper motor and servo motor manufacturer in Changzhou, China since 2004. We run 5 production lines with annual output over 1,000,000 motors, serving OEM customers in 30+ countries.
About Us facility Solutions CertificationsA motor driver is the power electronics between the controller and the motor. The controller sends a low-power signal — step/direction pulses for a stepper, or a position/speed/torque command for a servo — and the driver switches the high current the motor needs to follow it. Without the right driver, a motor can't run: the driver sets the current, the step resolution, and (on a servo) closes the feedback loop. We build our stepper motor drivers and servo drives to match our motors so the pairing is correct out of the box.
Two numbers matter most. The driver's rated output current should be at least 1.4 times the motor's rated phase current, so it can deliver peak torque without clipping. And the bus voltage should sit well above the motor's rated voltage — higher voltage holds torque as speed rises. Match those, set the microstepping, and the motor runs smooth and cool. We do this pairing for you when you buy the motor and driver together.
A stepper driver runs a stepper open loop — it pulses current into the phases in sequence, with no feedback, and the rotor follows. A servo drive runs a servo closed loop — it reads the encoder and adjusts current every cycle to track position, speed, or torque. Steppers and stepper drivers cost less and hold position well at low speed; servos and servo drives handle high speed and dynamic loads. A closed-loop stepper driver sits between the two, adding encoder correction to a stepper.
Microstepping divides each full step into smaller increments by shaping the phase current into a finer sinusoid. It gives smoother motion and less vibration, especially at low speed, and higher apparent resolution. The trade-off is that micro- and half-stepping deliver roughly 30% less torque than full step, so it's a resolution-versus-torque choice. Our stepper drivers offer selectable microstepping so you can tune that balance for your application.
Our servo drives support pulse/direction for simple step-style control, plus RS485, CANopen, and EtherCAT for bus-based motion systems, depending on the model. They run position, speed, and torque modes, with adjustable electronic gear ratio, gain, and inertia matching. Tell us your controller and protocol and we'll confirm the right drive.
Yes — that's the main reason to buy them together. We size the driver to the motor, set drive current and microstepping (steppers) or commutation, gain, and inertia matching (servos), and test the pair before it ships. You get a working motor-and-driver set with a wiring diagram, not two parts to commission yourself.
A working reference for engineers and procurement teams pairing a driver with a stepper or servo motor. It covers what a driver does, how to match it to the motor, the difference between stepper drivers and servo drives, and why microstepping and bus voltage matter.
A motor driver — sometimes called a stepper drive or servo drive — is the power stage that sits between the controller and the motor. The controller can only put out a low-power logic signal; the motor needs amps. The driver bridges that: it reads the command and switches the right current into the motor windings at the right time. For a stepper, that means pulsing current into the phases in the correct sequence so the rotor steps. For a servo, it means closing a loop around the encoder and adjusting current every cycle. Pick the wrong driver and the motor either won't run or runs badly — which is why we build ours to match our motors.
This is where most pairing problems start. Two specs decide whether a motor runs well:
When you buy the motor and driver from us as a set, we set both of these and the microstepping for you, so the pair is matched before it arrives.
| Stepper Driver | Servo Drive | |
|---|---|---|
| Control | Open loop (or closed with encoder) | Closed loop, always |
| Feedback | None / encoder on closed loop | Encoder |
| Control signal | Pulse / direction | Pulse or bus, multi-mode |
| Best speed range | Low to mid | Mid to high |
| Cost | Lower | Higher |
Match the driver to the motor type: a stepper driver for a stepper, a servo drive for a servo, a closed-loop stepper driver for an encoder-equipped stepper. They are not interchangeable.
Microstepping shapes the phase current into a finer sinusoid, splitting each full step into smaller ones. The payoff is smoother motion and lower vibration, especially at low speed, plus higher apparent resolution. The cost is torque: micro- and half-stepping give roughly 30% less torque than full step. A couple of practical notes — a high microstep count doesn't guarantee perfectly even increments, and the torque is set by the current, not the microstep number. Our stepper drivers offer selectable microstepping so you can pick the balance that fits the job.
A servo drive does more than switch current — it runs the control loop. Ours support three modes: position (follow a commanded angle), speed (hold a commanded rpm), and torque (hold a commanded force). Communication options cover pulse/direction for simple setups and RS485, CANopen, or EtherCAT for networked motion systems. Electronic gear ratio, gain, and inertia matching are adjustable, and because we tune the drive to its servo motor before shipping, commutation and basic gains are already set.
A motor and a driver are one system, not two products. Mismatched current, voltage, or tuning is the most common reason a motion axis underperforms. When you order the pair from us, we handle the matching — current and microstepping for steppers, commutation and gain for servos — and test the set before it leaves. You get a wiring diagram, a known-good pair, and one supplier to call if anything needs adjusting. Send us the motor model or the application and we'll confirm the right driver.
