Stepper Motor - Bipolar, 3.9V, 0.6 A/Phase (200 Steps/Rev) 20×30mm
The Pololu Stepper Motor - Bipolar, 3.9V, 0.6 A/Phase (200 Steps/Rev) is a small NEMA 8-size hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 600 mA at 3.9 V, allowing for a holding torque of 180 g-cm (2.5 oz-in). With a weight of 60 g, this is one of the smallest stepper motors we carry.
This small hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 600 mA at 3.9 V, allowing for a holding torque of 180 g-cm (2.5 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.
A 4 mm universal mounting hub can be used to mount objects on the stepper motor’s 4 mm-diameter output shaft.
- Size: 20 mm square × 30 mm, not including the shaft (NEMA 8)
- Weight: 60 g (2 oz)
- Shaft diameter: 4 mm “D”
- Steps per revolution: 200
- Current rating: 600 mA per coil
- Voltage rating: 3.9 V
- Resistance: 6.5 Ω per coil
- Holding torque: 180 g-cm (2.5 oz-in)
- Inductance: 1.7 mH per coil
- Lead length: 30 cm (12″)
More specifications are available in the datasheet (51k pdf).
The schematic diagram shows the stepper motor dimensions in mm. The dimension labeled “Length” is 30 mm. The output D-shaft has a length of 15 mm and a 4 mm diameter with a section that is flattened by 0.5 mm. This shaft works with a4 mm universal mounting hub.
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:
- CNC machines
- 3D printer/prototyping machines
- Laser cutters
- Pick and place machines
- Linear actuators
- Hard drives
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