Stepper Motor: Bipolar, 200 Steps/Rev, 57×56mm, 2.5V, 2.8 A/Phase

Stepper Motor: Bipolar, 200 Steps/Rev, 57×56mm, 2.5V, 2.8 A/Phase
Pololu item #: 1474 70 in stock

Price break Unit price (US$)
1 39.95
10 35.96


backorders allowed

This NEMA 23-size 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).

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 Description Specifications (13) Pictures (6) Resources (1) FAQs (2) 

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 × 56 mm, not including the shaft (NEMA 23)
  • Weight: 0.7 kg (25 oz)
  • Shaft diameter: 6.35 mm (0.25″) “D”
  • Steps per revolution: 200
  • Current rating: 2.8 A per coil
  • Voltage rating: 2.5 V
  • Resistance: 0.9 Ω per coil
  • Holding torque: 13 kg-cm (180 oz-in)
  • Inductance: 2.5 mH per coil
  • Lead length: 30 cm (12″)

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 (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 SY57STH56-2804A.