3321 - 28STH32 NEMA-11 Bipolar Stepper with 27:1 Gearbox
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This NEMA-11 motor has an integrated Planetary gearbox with a 26103/121 :1 ratio. 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 3321 has a maximum speed of 120 RPM. At the output of the gearbox, the step angle approximately 0.067°. When using the step angle in calculations, you should derive the exact step angle by dividing 1.8° by the gearbox reduction ratio.
The 3321 stepper motor connects to a bipolar motor controller such as the 1067 - PhidgetStepper Bipolar HC.
The following table 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.
| Wire Color | Black | Green | Red | Blue |
| Board Connector | A | B | C | D |
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.
Motor Properties
| Motor Type | Bipolar Stepper |
| Manufacturer Part Number | 28STH32-0674B / 28JXS40K27 |
| Step Angle | 0.067° |
| Step Accuracy | ± 5 % |
| Holding Torque | 16.1 kg·cm |
| Rated Torque | 14 kg·cm |
| Maximum Speed (w/1067 Motor Controller) | 120 RPM |
| Acceleration at Max Speed (w/1067 Motor Controller) |
1.8E+06 1/16 steps/sec² |
Electrical Properties
| Recommended Voltage | 12 V DC |
| Rated Current | 670 mA |
| Coil Resistance | 5.6 Ω |
Physical Properties
| Shaft Diameter | 6 mm |
| Rear Shaft Diameter | 3.9 mm |
| Mounting Plate Size | NEMA - 11 |
| Weight | 217.5 g |
| Number of Leads | 4 |
| Wire Length | 300 mm |
Gearbox Properties
| Gearbox Type | Planetary |
| Gear Ratio | 26 103⁄121 : 1 |
| Backlash Error | 1 1⁄2° |
| Maximum Strength of Gears | 20 kg·cm |
| Shaft Maximum Axial Load | 25 N |
| Shaft Maximum Radial Load | 35 N |
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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. |