# Stepper Motor: Bipolar, 200 Steps/Rev, 57×76mm, 3.2V, 2.8 A/Phase **Type:** Product page · **SKU:** POLOLU-1478 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-57-76mm-3-2v-2-8-a-phase.html ([markdown](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-57-76mm-3-2v-2-8-a-phase.html.md)) ## Retired product This product is retired and no longer available for purchase. Search the catalogue for an alternative. ## Description | [![](https://a.pololu-files.com/picture/0J2286.250.jpg?03f2124d8ece1d326e1806a964cd3b30)](https://a.pololu-files.com/picture/0J2286.1200.jpg?03f2124d8ece1d326e1806a964cd3b30) | |---| | Bipolar stepper motor wires are terminated with bare leads. | | ![](https://a.pololu-files.com/picture/0J2296.250.gif?d8febaea0bdf653188644bc9354bd0a5) | |---| | Bipolar stepper motor wiring diagram. | This high-torque hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 2.8 A at 3.2 V, allowing for a holding torque of 19 kg-cm (270 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 Pololu recommend using an appropriately powerful [bipolar stepper motor driver](https://core-electronics.com.au/breakout-boards-and-modules/motor-drivers-controllers/stepper-motor-drivers.html), such as Pololu's [High-Power Stepper Motor Driver 36v4](https://core-electronics.com.au/pololu-high-power-stepper-motor-driver-36v4.html), or Pololu's [Tic 36v4 High-Power Stepper Motor Controller](https://core-electronics.com.au/pololu-tic-36v4-usb-multi-interface-high-power-stepper-motor-controller.html). 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. | [![](https://a.pololu-files.com/picture/0J6183.300.jpg?496e3d2d90dc809fe0de05eee1250932)](https://a.pololu-files.com/picture/0J6183.1200.jpg?496e3d2d90dc809fe0de05eee1250932) | |---| | NEMA 23 stepper motor (item #1475) mounted with a steel L-bracket for NEMA 23 stepper motors. | Pololu's [1/4" universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-1-4-shaft-4-40-holes-2-pack.html) and [1/4" scooter wheel adapter](https://core-electronics.com.au/pololu-aluminum-scooter-wheel-adapter-for-1-4-shaft.html) can be used to mount objects on the stepper motor’s 1/4"-diameter output shaft, and Pololu carry a [NEMA 23 steel bracket](https://core-electronics.com.au/steel-l-bracket-for-nema-23-stepper-motors.html) 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: 2.8 A per coil - Voltage rating: 3.2 V - Resistance: 1.13 O per coil - Holding torque: 19 kg-cm (270 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 (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. This shaft works with Pololu's [1/4" universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-1-4-shaft-4-40-holes-2-pack.html) and [1/4" scooter wheel adapter](https://core-electronics.com.au/pololu-aluminum-scooter-wheel-adapter-for-1-4-shaft.html). | ![](https://a.pololu-files.com/picture/0J4513.600.jpg?4ad62fecd520b9c9a7bb1d8109806188) | |---| | [![](https://a.pololu-files.com/picture/0J2297.300.jpg?d80d29ad1a0ae226923b71c68ddcbf9c)](https://a.pololu-files.com/picture/0J2297.1200.jpg?d80d29ad1a0ae226923b71c68ddcbf9c) | |---| | 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 | [![](https://a.pololu-files.com/picture/0J4511.600.jpg?bbe10f56dcfa8d58f2cce527dd1f1b13)](https://a.pololu-files.com/picture/0J4511.1200.jpg?bbe10f56dcfa8d58f2cce527dd1f1b13) | |---| | Pololu’s assortment of stepper motors. | **Note:** This stepper motor is SOYO part number SY57STH76-2804A. **People often buy this product together with:** | [![Pololu Universal Aluminum Mounting Hub for 1/4](https://a.pololu-files.com/picture/0J5002.100.jpg?3a06a2d8159fd097193759742ede4eb9)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-1-4-shaft-4-40-holes-2-pack.html) | [Pololu Universal Aluminum Mounting Hub for 1/4" (6.35mm) Shaft, #4-40 Holes (2-Pack)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-1-4-shaft-4-40-holes-2-pack.html) | |---|---| | [![Steel L-Bracket for NEMA 23 Stepper Motors](https://a.pololu-files.com/picture/0J6182.100.jpg?6051cf154aadaac8d12ba80a9dbb5521)](https://core-electronics.com.au/steel-l-bracket-for-nema-23-stepper-motors.html) | [Steel L-Bracket for NEMA 23 Stepper Motors](https://core-electronics.com.au/steel-l-bracket-for-nema-23-stepper-motors.html) | |---|---| | [![DRV8825 Stepper Motor Driver Carrier, High Current](https://a.pololu-files.com/picture/0J4226.100.jpg?a92e8e8b3227558d31d2fa4af96c7d83)](https://core-electronics.com.au/drv8825-stepper-motor-driver-carrier-high-current.html) | [DRV8825 Stepper Motor Driver Carrier, High Current](https://core-electronics.com.au/drv8825-stepper-motor-driver-carrier-high-current.html) | |---|---| **Dimensions** | Size: | 56.4 mm square × 76 mm[1](https://core-electronics.com.au/#note1) | |---|---| | NEMA size: | 23 | | Weight: | 1000 g | | Shaft diameter: | 6.35 mm | **General specifications** | Shaft type: | 1/4 inch "D" | |---|---| | Current rating: | 2800 mA[2](https://core-electronics.com.au/#note2) | | Voltage rating: | 3.2 V | | Holding torque: | 270 oz·in | | Steps per revolution: | 200 | | Resistance: | 1.13 Ohm[2](https://core-electronics.com.au/#note2) | | Inductance per phase: | 3.6 mH | | Number of leads: | 4 | | Lead length: | 30 cm | **Notes:** 1Not including the shaft.2Per coil. **File downloads** - **SY57STH76-2804A stepper motor datasheet (49k pdf)** - **3D model of the SY57STH76-2804A stepper motor (Pololu item #1478) (3MB step)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/s/t/stepper_motor_bipolar_200_steps_rev_57x76mm_3.2v_2.8_a_phase__pololu_1478__00.jpg)