Products for USB Sensing and Control
3320_0 - 28STH32 NEMA-11 Bipolar Gearless Stepper Motor
Quantity Price
In Stock
Qty: 458

Product Features

This tiny stepper with a rear shaft has a 1.8° step angle and 520 g·cm of torque at low speeds.
Product Description

This NEMA-11 motor generates 600 g-cm of holding torque at 0.67 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 3320 has a maximum speed of approximately 426 RPM.

Motor Controller and Connection

The 3320 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 3337 - Mounting Bracket (NEMA11).

Product Specifications

Motor Properties

Motor TypeBipolar Stepper
Manufacturer Part Number28STH32-0674B
Step Angle1.8°
Step Accuracy± 5 %
Holding Torque600 g·cm
Rated Torque520 g·cm
Maximum Speed (w/1067 Motor Controller)426 RPM
Acceleration at Max Speed
(w/1067 Motor Controller)
2.2E+06 1/16 steps/sec²

Electrical Properties

Recommended Voltage12 V DC
Rated Current670 mA
Coil Resistance5.6 Ω
Phase Inductance3.4 mH

Physical Properties

Shaft Diameter5 mm
Rear Shaft Diameter3.9 mm
Mounting Plate SizeNEMA - 11
Weight111.4 g
Number of Leads4
Wire Length300 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.