Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 57×76mm, 4.5V, 2 A/Phase

6-lead, unipolar/bipolar stepper motor wires are terminated with bare leads.

6-lead, unipolar/bipolar stepper motor wiring diagram.

This high-torque hybrid stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 2 A at 4.5 V, allowing for a holding torque of 14 kg-cm (190 oz-in). The motor has six color-coded wires terminated with bare leads that allow it to be controlled by both unipolar and bipolar stepper motor drivers. When used with a unipolar stepper motor driver, all six leads are used. When used with a bipolar stepper motor driver, the center-tap yellow and white wires can be left disconnected (the red-blue pair gives access to one coil and the black-green pair gives access to the other coil). Pololu recommend using it as a bipolar stepper motor and controlling it with an appropriately powerful bipolar stepper motor driver, such as Pololu's High-Power Stepper Motor Driver 36v4, or Pololu's Tic 36v4 High-Power Stepper Motor Controller. In particular, the Tic makes control easy because it supports six different interfaces (USB, TTL serial, I²C, RC, analog voltages, and quadrature encoder) and is configurable over USB with Pololu's free configuration utility.

NEMA 23 stepper motor (item #1475) mounted with a steel L-bracket for NEMA 23 stepper motors.

Pololu's 1/4" universal mounting hub and 1/4" scooter wheel adapter can be used to mount objects on the stepper motor’s 1/4"-diameter output shaft, and Pololu carry a NEMA 23 steel bracket for securely mounting this stepper motor to a flat surface.

Specifications

• Size: 56.4 mm square × 76 mm, not including the shaft (NEMA 23)
• Weight: 1 kg (35 oz)
• Shaft diameter: 6.35 mm (0.25") “D”
• Steps per revolution: 200
• Current rating: 2 A per coil
• Voltage rating: 4.5 V
• Resistance: 2.25 O per coil
• Holding torque: 14 kg-cm (190 oz-in)
• Inductance: 3.6 mH per coil
• Lead length: 30 cm (12")
• Output shaft supported by two ball bearings

More specifications are available in the datasheet (39k pdf).

Dimensions

The following diagram shows the stepper motor dimensions in mm. The output D-shaft has a 0.25" (6.35 mm) diameter with a section that is flattened by 0.5 mm. This shaft works with Pololu's 1/4" universal mounting hub and 1/4" scooter wheel adapter.

The inside of a bipolar stepper motor (SOYO NEMA 14-size).

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 (e.g. RepRap)
• Laser cutters
• Pick and place machines
• Linear actuators
• Hard drives

Pololu’s assortment of stepper motors.

Note: This stepper motor is SOYO part number SY57STH76-2006A.

People often buy this product together with:

Pololu Universal Aluminum Mounting Hub for 1/4" (6.35mm) Shaft, #4-40 Holes (2-Pack)

Steel L-Bracket for NEMA 23 Stepper Motors

DRV8825 Stepper Motor Driver Carrier, High Current

Dimensions

General specifications

Notes:

1

Not including the shaft.

2

Per coil.

File downloads

• SY57STH76-2006A stepper motor datasheet (39k pdf)

• 3D model of the SY57STH76-2006A stepper motor (Pololu item #1475) (3MB step)