Pololu 1474 - Stepper Motor: Bipolar, 200 Steps/Rev, 57A—56mm, 2.5V, 2.8 A/Phase

Bipolar stepper motor wires are terminated with bare leads.

Bipolar stepper motor wiring diagram.

Overview

This high-torque hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 2.8 A at 2.5 V, allowing for a holding torque of 13 kg-cm (180 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 1/4" universal mounting hub can be used to mount objects on the stepper motor’s 1/4"-diameter output shaft.

Specifications

• Size: 56.4 mm square A— 56 mm, not including the shaft (NEMA 23)
• Weight: 0.7 kg (25 oz)
• Shaft diameter: 1/4" (6.35 mm) “D”
• Steps per revolution: 200
• Current rating: 2.8 A per coil
• Voltage rating: 2.5 V
• Resistance: 0.9 Ohm per coil
• Holding torque: 13 kg-cm (180 oz-in)
• Inductance: 2.5 mH per coil
• Lead length: 12 in

More specifications are available in the datasheet (49k 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 (note: the diagram below incorrectly lists this flattened width as 6 mm when it is really 5.85 mm). This shaft works with our 1/4" 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 SY57STH56-2804A.