Stepper Motor: Bipolar, 200 Steps/Rev, 42x38mm, 2.8V, 1.7 A/Phase
This hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 1.7 A at 2.8 V, allowing for a holding torque of 3.7 kg-cm (51 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. Our DRV8825 stepper motor driver carrier is probably the best option for this stepper motor.
Bipolar stepper motor wires are terminated with bare leads.
Bipolar stepper motor wiring diagram.
Our 5 mm universal mounting hub can be used to mount objects on the stepper motor’s 5 mm-diameter output shaft, and our NEMA 17 aluminum bracket offers a variety of options for mounting this stepper motor in your project. This NEMA17 stepper motor is also available with threaded rod output shafts in lengths of 18 cm, 28 cm, or 38 cm that convert its rotations into linear motion of the included traveling nut.
- Size: 42.3 mm square × 38 mm, not including the shaft (NEMA 17)
- Weight: 285 g (10 oz)
- Shaft diameter: 5 mm “D”
- Steps per revolution: 200
- Current rating: 1.68 A per coil
- Voltage rating: 2.8 V
- Resistance: 1.65 Ω per coil
- Holding torque: 3.7 kg-cm (51 oz-in)
- Inductance: 3.2 mH per coil
- Lead length: 30 cm (12″)
- Output shaft supported by two ball bearings
More specifications are available in the datasheet (39k pdf).
The following diagram shows the stepper motor dimensions in mm. The dimension labeled “length” is 38 mm. The output D-shaft has a 5 mm diameter with a section that is flattened by 0.5 mm. This shaft works with our 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
Pololu’s assortment of stepper motors.
Note: This stepper motor is SOYO part number SY42STH38-1684A.
42.3 mm square × 38 mm
|Shaft diameter:||5 mm|
|Shaft type:||5 mm "D"|
|Current rating:||1680 mA2|
|Voltage rating:||2.8 V|
|Holding torque:||51 oz·in|
|Steps per revolution:||200|
|Inductance per phase:||3.2 mH|
|Number of leads:||4|
|Lead length:||30 cm|
- SY42STH38-1684A stepper motor datasheet (39k pdf)
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