This hybrid stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 1.2 A at 4 V, allowing for a holding torque of 3.2 kg-cm (44 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.
|6-lead, unipolar/bipolar stepper motor wires are terminated with bare leads.|
|6-lead, unipolar/bipolar stepper motor wiring diagram.|
Pololu's 5 mm universal mounting hub can be used to mount objects on the stepper motor’s 5 mm-diameter output shaft, and Pololu's NEMA 17 aluminum bracket offers a variety of options for mounting this stepper motor in your project. A similar NEMA17 stepper motor is available with a threaded rod output shaft that converts its rotations into linear motion of the included traveling nut.
- Size: 42.3 mm square × 48 mm, not including the shaft (NEMA 17)
- Weight: 350 g (13 oz)
- Shaft diameter: 5 mm “D”
- Steps per revolution: 200
- Current rating: 1.2 A per coil
- Voltage rating: 4 V
- Resistance: 3.3 Ω per coil
- Holding torque: 3.2 kg-cm (44 oz-in)
- Inductance: 2.8 mH per coil
- Lead length: 30 cm (12″)
More specifications are available in the datasheet (189k pdf).
The following diagram shows the stepper motor dimensions in mm. The dimension labeled “length” is 48 mm. The output D-shaft has 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:
- CNC machines
- 3D printer/prototyping machines (e.g. RepRap)
- Laser cutters
- Pick and place machines
- Linear actuators
- Hard drives
Note: This stepper motor is SOYO part number SY42STH47-1206A.
This product is listed in:
Documentation and Resources:
- The Maker Revolution
- Motor Drivers vs. Motor Controllers
If you’ve ever built a robot with wheels, or any motorised parts really, you’ll have come across the issue of needing to drive it from your microcontroller. Because a standard chip is only able to output a small amount of current, you&rsq...
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