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High-Speed Stepper Motor and DC Input Driver Package

RBK Series

2-Phase Stepper Motor and Driver Package - RBK Series

The RBK Series is a stepper motor and driver package consisting of a 2-phase stepper motor and DC input microstepping driver. The RBK Series offers a High-Torque or Standard stepper motor, a terminal box type stepper motor which is IP65 rated or a Planetary geared stepper motor. The RBK Series offers the highest torque for the entire speed range and adopts our Smooth Drive technology, allowing for maximum performance without changing your controller output pulses.

The RBK Series is available with 5 frame sizes of 1.10 in. (28mm), 1.38 in. (35mm), 1.65 in. (42 mm), 2.22 in. (56.4mm) [2.36 in. (60 mm) Geared] and 3.35 in. (85mm), geared type stepper motors and encoder options.

Advanced SearchSafety Marks

Microstep Function

The microstepping driver electronically divides the basic step angle of the motor (1.8°/step) by up to 128 steps without the use of a reduction mechanism or other mechanical element. 16 different resolutions levels are available. The available range of resolution settings is 200 (1.8°/step) to 25600 (0.0140625°/step). The step angle can be easily set using the built-in switches on the driver. This function enables low-vibration and low-noise operation.


Smooth Drive Function

The Smooth Drive Function automatically controls the stepper motor's microstep drive operation at the same travel and speed as in the full-step mode, without the operator having to change the speed settings of the driver's pulse input. It enables low-vibration operation available with the microstepping drive to be achieved with the flick of a switch.

Smooth Drive

Third Harmonic Waveform Correction Function

This function corrects stepper motor drive current waveforms. It provides improved angle accuracy and reduced vibration.

Third Harmonic Waveform

Vibration Suppression Function

This function improves vibrations in the medium speed range of stepper motors. It enables reduced risk of missteps due to vibrations.Vibration Suppression

Wide Voltage Range Driver

RBK Driver

The RBK Series utilizes a constant current driver with a wide voltage range of 20 to 75 VDC (20 to 40 VDC
for High-Torque and Planetary Geared models). This enables it to support a wide range of power sources and raising the power supply voltage enables increased torque during high speed operation.


Wide Voltage Range

NOTE: Raising the power supply voltage enables increased torque during high speed operation.

Available Motors

High Torque Type Stepper Motors

The high-torque type stepper motor adopts new technology and design. The motor produces approximately 30 ~ 50% higher torque than a conventional stepper motor of the same size.

High Torque Type

PS/PL Geared Type Stepper Motors

PL Gear

  • Planetary Geared
  • High Permissible Torque
  • In-line Output Shaft
  • Low Backlash [35 arc minutes (0.58°)]
  • Gear ratios: 5:1, 10:1, 36:1*
    (*not available for 28mm)

Terminal Box Type Stepper Motors

terminal box

  • Conforms to IP65 standard
  • Protects against ingress from dust or water
  • Can be wired directly from motor terminal block


Encoder Option Available

  • Encoder option is available for more reliability. (Except for 1.10 in. frame size and PL Geared type)
  • Save time ordering parts, assembling and inspecting.
  • 4 encoder types: 200 or 400 pulses/rev (P/R), 2 or 3 channels.


Product Lineup

Motor Frame Size

Basic Step

Max. Holding
w/o Encoder
w/ Encoder
High Torque
1.8° High-Torque

A high-torque motor has approx. 1/3 ~ 1.5 times more torque when compared to a step angle 1.8° standard stepper motor.

20 ~ 40 VDC


9.2 ~ 15.6 oz-in
(0.065 ~ 0.11 N·m)
28 ~ 52 oz-in
(0.2 ~ 0.37 N·m)
68 ~ 132 oz-in
(0.48 ~ 0.93 N·m)
1.8° Standard

The basic model offers a good balance of torque and low vibration / noise characteristics.

20 ~ 75 VDC
68 ~ 240 oz-in
(0.48 ~ 1.75 N·m)
310 ~ 930 oz-in
(2.2 ~ 6.6 N·m)
Terminal Box
1.8° Terminal Box

A terminal box motor conforms to the IP65 standard of ingress protection against dust and water.

20 ~ 75 VDC
68 ~ 240 oz-in
(0.48 ~ 1.75 N·m)
310 ~ 930 oz-in
(2.2 ~ 6.6 N·m)

A geared stepper motor with planetary gear mechanism offering low backlash and high strength.

20 ~ 40 VDC
0.18°, 0.36°
42 ~ 71 oz-in
(0.3 ~ 0.5 N·m)
0.05° - 0.36°
8.8 ~ 26 lb-in
(1 ~ 3 N·m)
30 ~ 70 lb-in
(3.5 ~ 8 N·m)

View Products = View all available part numbers for RBK Series Stepper Motor and Driver Systems

System Configuration

Build a complete system online by selecting your base motor and driver and adding all necessary accessories and/or controller.

Build a System

Couplings / Brackets

Flexible Couplings

Motor Cables

This three-piece coupling adopts an aluminum alloy hub and a resin spider. The simple construction ensures that the high torque generated by a gear motor can be transmitted reliably. The proper elasticity of the spider suppresses motor vibration.

Motor Mounting Brackets

Mounting Bracket

Mounting brackets are convenient for installation and securing a stepper motor or geared stepper motor.



General-Purpose Cables

General-Purpose CablesThese are dedicated 15-conductor cables for connecting the I/O signal connector and programmable controller. They are high-quality noise-blocking, double shielded cables.

Encoder Cable
(included with package)

Encoder Cable

This encoder cable is available for use with the appropriate motors with encoders. [An encoder cable of 2 ft. (0.6 m) is included with the motor with encoder and driver packages.]


Clean Dampers

Clean DamperMechanical dampers suppress stepper motor vibration and improve high-speed performance. An inertia body and silicon gel are hermetically sealed in a plastic case.

(For use with Double Shaft motors)


Cables / Connectors

Connection Cable for Terminal Box Type Motor

Connection CableA cable for connection between the terminal box type and driver (with protective earth wire)

Connection Cables for Connector Type Motors
(included with package)


This lead wire connection cable with a conveniently crimped connector is for connector-coupled motor, and for connecting motors and drivers. [A connection cable of 2 ft. (0.6 m) is included with the motor with connector and driver packages.]

DIN Rail Mounting Plate

DIN Rail Mounting Plate

This mounting plate is convenient for installing the driver on DIN rails with ease.




Controllers are devices that output pulse signals needed to operate a stepper motor. Controllers let you make various settings to control your motor and also permit connection with a host programmable controller and sensors or PC. Select a controller that best suits your system.



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