Stepper motor drivers for CNC

Choose the right stepper motor driver for your CNC machine, automation system or motion control application. PoLabs stepper drivers offer precise current control, microstepping and reliable motor control in compact, easy-to-integrate designs.

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Which stepper motor driver do i choose?

The right stepper motor driver depends primarily on the motor’s phase current, supply voltage, required microstepping resolution and the application in which the motor will be used.

For CNC machines and precision motion applications, the PoStep25-256 provides up to 2.5 A phase current and up to 256 microsteps. It is suitable for applications where smooth motion, precise control and compact dimensions are important.

For larger motors and more demanding CNC applications, the PoStep60-256 provides up to 6 A phase current and supports supply voltages up to 50 V DC. It also provides advanced configuration, diagnostics and communication options.

When selecting a driver, always compare the electrical specifications of the motor with the maximum current and voltage supported by the driver.

How to select stepper motor driver for your application?

FeaturePoStep25-256PoStep60-256PoStepVID6606
ApplicationCNC & motion controlHigh-power CNC & motion controlCNC & motor control
Maximum phase currentUp to 2.5 AUp to 6 A—
MicrosteppingUp to 1/256Up to 1/256—
Supply voltage10–30 V DC10–50 V DC—
Step/Direction control✓✓✓
USB configuration—✓—
Advanced configuration✓✓—
Protection functions✓✓—
PoKeys integration✓✓✓
Recommended usePrecision CNC and automationLarger CNC machines and high-current motorsIntegrated motor control for instrument steppers

Always check the individual product page for the latest and complete technical specifications.

Why choose stepper motor drivers from PoLabs?

PoLabs stepper motor drivers are designed for reliable and precise motion control in CNC machines, automation systems and other demanding applications. With high-resolution microstepping, adjustable motor current and built-in protection features, they provide smooth and dependable motor operation. PoStep drivers are also designed for easy integration with PoLabs PoKeys CNC controllers, while standard Step/Direction interfaces make them compatible with a wide range of CNC controllers. Compact construction, flexible configuration and practical diagnostic features make PoLabs stepper motor drivers a reliable choice for both new machine designs and CNC retrofit projects.

Stepper motor drivers for PoKeys CNC controllers

PoLabs stepper motor drivers can be combined with PoKeys CNC controllers to create a flexible and scalable CNC motion-control system.

The PoKeys controller handles motion control, machine inputs and outputs, while the external PoStep driver provides the power stage required to drive the stepper motor.

This modular approach allows the motor driver to be selected according to the motor’s current requirements.

For example, a CNC machine can use a PoKeys controller with multiple PoStep25-256 drivers for moderate-current motors, while larger axes can use PoStep60-256 drivers.

This makes the system suitable for CNC routers, milling machines, plasma cutters, woodworking machines and CNC

How to match a stepper motor with a driver

The most important parameter when selecting a stepper motor driver is the motor phase current.

The driver must be capable of supplying the current required by the motor. The motor’s rated current should always be considered when configuring the driver.

Other important parameters include:

  • Motor phase current
  • Motor winding configuration
  • Supply voltage
  • Required motor speed
  • Required torque
  • Microstepping resolution
  • Control interface
  • Cooling requirements
  • Available space
  • Required protection and diagnostic functions

For CNC applications, motor speed and acceleration are particularly important. A stepper motor’s available torque generally decreases as rotational speed increases, so the driver and power supply must be selected together with the motor and mechanical system.

Stepper motor driver power supply

The power supply is an important part of the stepper motor system.

The driver supply voltage affects the motor’s ability to maintain torque at higher speeds. In general, a higher supply voltage can help a stepper motor maintain performance at higher rotational speeds, provided that the driver and motor are designed for it.

The PoStep25-256 and PoStep60-256 have different supply-voltage ranges, so the power supply should be selected according to the driver, motor and required operating conditions.

The power supply should also provide sufficient current for the complete system and should be selected with appropriate safety margins.

What you should know before purchasing stepper motor driver?

A stepper motor driver is an electronic device that controls the current flowing through the windings of a stepper motor. It receives control signals from a CNC or motion controller and supplies the electrical power required by the motor.

Yes, when using external stepper motors. A CNC controller generally provides control signals but does not directly supply the current required by the motor. A dedicated stepper motor driver is therefore required.

The CNC controller generates and coordinates the motion commands. The stepper motor driver receives those commands and supplies the required electrical current to the motor.

They perform different functions but work together as part of the CNC motion-control system.

Yes. PoLabs CNC controllers can be used with Mach3 and Mach4, while PoStep drivers provide the motor-driving stage between the controller and the stepper motors.

Yes, provided that the motor’s electrical specifications are within the driver’s operating limits.

The important parameter is the motor’s phase current, not simply the NEMA frame size.

It can be suitable for a NEMA 34 motor if the motor’s electrical requirements are compatible with the driver’s voltage and current specifications.

Always check the motor datasheet before selecting the driver.

Not necessarily. Higher microstepping mainly improves motion smoothness and can reduce vibration and resonance.

The actual positioning accuracy depends on the complete mechanical and control system.

The PoStep25-256 and PoStep60-256 support up to 256 microsteps per full motor step.

Yes. PoStep drivers can be used as part of CNC retrofit systems, preferably together with PoKeys CNC controllers and CNC software such as Mach3 or Mach4.

Yes. The drivers can be used with controllers that provide compatible Step/Direction control signals. This makes them suitable for a wide range of CNC and motion-control systems.

Build your complete CNC motion control system

A stepper motor driver is only one part of a complete CNC motion-control system.

PoLabs provides a range of CNC controllers, stepper motor drivers, motors, CNC pendants, I/O modules and other CNC accessories that can be combined to create a complete motion-control solution.

Whether you are building a new CNC machine, upgrading an existing machine or developing an automation system, PoLabs products provide the hardware needed for reliable digital motion control.