Bipolar stepper motor wires are terminated with bare leads.

Bipolar stepper motor wiring diagram.

Overview

This small hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 600 mA at 3.9 V, allowing for a holding torque of 180 g-cm (2.5 oz-in). The motor has four color-coded wires terminated with bare leads: black and green connect to one coil; red and blue connect to the other. It can be controlled by a pair of suitable H-bridges (one for each coil), but we recommend using a bipolar stepper motor driver.

Our 4 mm universal mounting hub can be used to mount objects on the stepper motor’s 4 mm-diameter output shaft.

Specifications

  • Size: 20 mm square × 30 mm, not including the shaft (NEMA 8)
  • Weight: 60 g (2 oz)
  • Shaft diameter: 4 mm “D”
  • Steps per revolution: 200
  • Current rating: 600 mA per coil
  • Voltage rating: 3.9 V
  • Resistance: 6.5 Ω per coil
  • Holding torque: 180 g-cm (2.5 oz-in)
  • Inductance: 1.7 mH per coil
  • Lead length: 30 cm (12″)
  • Output shaft supported by two ball bearings

More specifications are available in the datasheet (51k pdf).

Dimensions

The following diagram shows the stepper motor dimensions in mm. The dimension labeled “Length” is 30 mm. The output D-shaft has a length of 15 mm and a 4 mm diameter with a section that is flattened by 0.5 mm. This shaft works with our 4 mm universal mounting hub.

The inside of a bipolar stepper motor.

Stepper Motor Applications

Stepper motors are generally used in a variety of applications where precise position control is desirable and the cost or complexity of a feedback control system is unwarranted. Here are a few applications where stepper motors are often found:

  • Printers
  • CNC machines
  • 3D printer/prototyping machines
  • Laser cutters
  • Pick and place machines
  • Linear actuators
  • Hard drives

Pololu’s assortment of stepper motors.

Note: This stepper motor is SOYO part number SY20STH30-0604A.


Specifications

Dimensions

Size: 20 mm square × 30 mm1
NEMA size: 8
Weight: 60 g
Shaft diameter: 4 mm

General specifications

Shaft type: 4 mm "D"
Current rating: 600 mA2
Voltage rating: 3.9 V
Holding torque: 2.5 oz·in
Steps per revolution: 200
Resistance: 6.5 Ohm2
Inductance per phase: 1.7 mH
Number of leads: 4
Lead length: 30 cm

Notes:

1
Not including the shaft.
2
Per coil.

Resources

File downloads

SY20STH30-0604A stepper motor datasheet (51k pdf)

(PL-1204)

SKU PL-1204
Brand Pololu

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