3331_0 - 57STH56 NEMA-23 Bipolar Gearless Stepper

This high-speed bipolar stepper with a rear shaft has a 1.8° step angle and 11 kg·cm of torque at low speeds.

Product Description


This NEMA-23 motor generates 12.6 kg-cm of holding torque at 2.8 Amps. It comes with the rear shaft exposed, so you can mount an encoder or shaft coupler.

When connected to a 1067 - PhidgetStepper Bipolar HC, the 3331 has a maximum speed of 3000 RPM.


Motor Controller and Connection


The 3331 stepper motor connects to a bipolar motor controller such as the 1067 - PhidgetStepper Bipolar HC.

The following diagram shows how to connect the motor wires to the board connectors to produce a clockwise rotation in the stepper motor when increasing position. To wire for counter-clockwise rotation when increasing position, reverse the red and blue wires.


Note: Make sure to unplug the power cord from the motor controller before switching wires around.

The rear shaft of this motor can be equipped with the HKT22 Optical Encoder for applications where you need to keep track of the exact position, velocity, or acceleration of the motor.



Mounting Bracket


The mounting holes on this motor are compatible with the 3339 - Mounting Bracket (NEMA23).


Product Specifications


Motor Properties

Motor Type Bipolar Stepper
Manufacturer Part Number 57STH56-2804B
Step Angle 1.8°
Step Accuracy ± 5 %
Holding Torque 12.6 kg·cm
Rated Torque 11 kg·cm
Maximum Speed (w/1067 Motor Controller) 3000 RPM
Acceleration at Max Speed
(w/1067 Motor Controller)
300000 1/16 steps/sec²


Electrical Properties

Recommended Voltage 12 V DC
Rated Current 2.8 A
Coil Resistance 900 mΩ
Phase Inductance 2.5 mH


Physical Properties

Shaft Diameter 6.4 mm
Rear Shaft Diameter 3.9 mm
Mounting Plate Size NEMA - 23
Weight 686 g
Number of Leads 4
Wire Length 300 mm




warning Connecting the motor directly to a power supply will destroy the motor and void the warranty. If you want to check your motor make sure it is connected to a constant current / chopper drive controller.