Stepper Motor: Bipolar, 200 Steps/Rev, 35×36mm, 2.7V, 1 A/Phase

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 1 A at 2.7 V, allowing for a holding torque of 1.4 g-cm (20 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 recommends using a bipolar stepper motor driver.

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

Specifications

• Size: 35 mm square × 36 mm, not including the shaft (NEMA 14)
• Weight: 180 g (6 oz)
• Shaft diameter: 5 mm “D”
• Steps per revolution: 200
• Current rating: 1 A per coil
• Voltage rating: 2.7 V
• Resistance: 2.7 Ω per coil
• Holding torque: 1.4 kg-cm (20 oz-in)
• Inductance: 4.3 mH per coil
• Lead length: 30 cm (12?)

More specifications are available in the datasheet (182k pdf).

Dimensions

The following diagram shows the stepper motor dimensions in mm. The dimension labeled “length” is 36 mm. The output D-shaft has a length of 21 mm and a 5 mm diameter with a section that is flattened by 0.5 mm. This shaft works with Pololu's 5 mm 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 SY35ST36-1004A.