Bipolar stepper motor wires are terminated with bare leads.

Bipolar stepper motor wiring diagram.

Overview

This hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 670 mA at 4.5 V, allowing for a holding torque of 950 g-cm (13 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 or one of our Tic Stepper Motor Controllers. In particular, the Tics make control easy because they support six different interfaces (USB, TTL serial, I²C, RC, analog voltages, and quadrature encoder) and are configurable over USB with our free configuration utility.

Our 5 mm universal mounting hub can be used to mount objects on the stepper motor’s 5 mm-diameter output shaft.

Specifications

• Size: 28 mm square × 45 mm, not including the shaft (NEMA 11)
• Weight: 140 g (5 oz)
• Shaft diameter: 5 mm “D”
• Steps per revolution: 200
• Current rating: 670 mA per coil
• Voltage rating: 4.5 V
• Resistance: 6.8 Ω per coil
• Holding torque: 950 g-cm (13 oz-in)
• Inductance: 4.9 mH per coil
• Lead length: 30 cm (12″)
• Output shaft supported by two ball bearings

More specifications are available in the datasheet (45k pdf).

Dimensions

The following diagram shows the stepper motor dimensions in mm. The dimension labeled “Length” is 45 mm. The output shaft has a length of 20 mm and a 5 mm diameter with a section that is flattened by 0.5 mm. This shaft works with our 5 mm universal mounting hub.

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 SY28STH45-0674A.

People often buy this product together with:

Pololu Universal Aluminum Mounting Hub for 5mm Shaft, #4-40 Holes (2-Pack)

Stepper Motor: Bipolar, 200 Steps/Rev, 20×30mm, 3.9V, 0.6 A/Phase

Stepper Motor: Bipolar, 200 Steps/Rev, 28×32mm, 3.8V, 0.67 A/Phase