NEMA 8 Bipolar Stepper Motor: 200 Steps/Rev, 3.9V, 0.6 A/Phase

This 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 just 60g, this is one of the smallest SOYO stepper motors we carry.

The motor has four colour-coded wires terminated with bare leads: black and green connect to one coil; red and blue connect to the other. These leads connect to the stepper motor through a removable JST-ZHR-5 connector. The motor can be controlled by a pair of suitable H-bridges (one for each coil), but we recommend using a bipolar stepper motor driver.

Our 4 mm universal mounting hub can be used to mount objects on the stepper motor’s 4 mm-diameter output shaft.

Note: This stepper motor is SOYO part number SY20STH30-0604A.

Specifications

• 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″)
• Output shaft supported by two ball bearings

More specifications are available in the datasheet.

Dimensions

The following diagram shows the stepper motor dimensions in mm. The dimension labelled “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 our 4 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:

• Printers
• CNC machines
• 3D printer/prototyping machines
• Laser cutters
• Pick and place machines
• Linear actuators
• Hard drives

Resources

• SY20STH30-0604A stepper motor datasheet
• 3D Model