|6-lead, unipolar/bipolar stepper motor wires are terminated with bare leads.|
|6-lead, unipolar/bipolar stepper motor wiring diagram.|
This high-torque hybrid stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 2 A at 3.6 V, allowing for a holding torque of 9 kg-cm (125 oz-in). The motor has six color-coded wires terminated with bare leads that allow it to be controlled by both unipolar and bipolar stepper motor drivers. When used with a unipolar stepper motor driver, all six leads are used. When used with a bipolar stepper motor driver, the center-tap yellow and white wires can be left disconnected (the red-blue pair gives access to one coil and the black-green pair gives access to the other coil). Pololu recommend using it as a bipolar stepper motor.
Pololu's 1/4″ universal mounting hub can be used to mount objects on the stepper motor’s 1/4″-diameter output shaft.
- Size: 56.4 mm square × 56 mm, not including the shaft (NEMA 23)
- Weight: 0.7 kg (25 oz)
- Shaft diameter: 6.35 mm (0.25″) “D”
- Steps per revolution: 200
- Current rating: 2 A per coil
- Voltage rating: 3.6 V
- Resistance: 1.8 Ω per coil
- Holding torque: 9 kg-cm (125 oz-in)
- Inductance: 2.5 mH per coil
- Lead length: 30 cm (12″)
More specifications are available in the datasheet (49k pdf).
The following diagram shows the stepper motor dimensions in mm. The output D-shaft has a 0.25″ (6.35 mm) diameter with a section that is flattened by 0.5 mm (note: the diagram below incorrectly lists this flattened width as 6 mm when it is really 5.85 mm). This shaft works with Pololu's 1/4″ 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:
- 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 SY57STH56-2006A.
Documentation and Resources:
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