Stepper Motor NEMA 8 (200 Steps/Rev, 3.9V, 600mA, Bipolar)
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.
The 4mm universal mounting hub can be used to mount objects on the stepper motor’s 4mm-diameter output shaft.
- Size: 20 mm square x 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 Ohm per coil
- Holding torque: 180 g-cm (2.5 oz-in)
- Inductance: 1.7 mH per coil
- Lead length: 12 in
The following diagram shows the stepper motor dimensions in mm. The dimension labeled “Length” is 30 mm. The output shaft has a length of 15 mm and a diameter of 4 mm. Though not shown in the diagram, the output is a D-shaft with a section that is flattened by 0.5 mm.
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