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Stepper motors are, in effect, DC motors with a twist. Instead of being powered by a continuous flow of current, as with regular DC motors, they are driven by pulses of electricity. Each pulse drives the shaft of the motor a little bit. The more pulses that are fed to the motor, the more the shaft turns. As such, stepper motors are inherently “digital” devices, a fact that will come in handy when you want to control your robot by computer. Unipolar motors have two coils, but each one has a centre tap. They are readily recognizable because they have 5, 6 or even 8 leads. It is possible to drive 6 or 8 lead unipolar motors as bipolar motors if you ignore the centre tap wires. A 5 lead motor has both centre taps connected, so re-wiring them to a 4 lead version requires at least opening the motor, if it can be done at all. The main beauty of unipolar motors is that you can step them without having to reverse the direction of current in any coil, which makes the electronics simpler. Some early RepRap prototypes used this trick. Because the centre tap is used to energise only half of each coil at a time, unipolar motors generally have less torque than bipolar motors

Motor Connections

motor connections
Number Wire Color Connection
1 Blue Coil A 1
2 Pink Coil B1
3 Yellow Coil A 2
4 Orange Common
5 Red Coil B 2
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Unipolar Stepper Motor

Product Code: (H-ELC-MOT-STP-2)


in stock


General Specifications
Shaft Diameter 5mm
Step Angle 5.625° /64
Motor Type Unipolar Stepper Motor
Number of Leads 5
Power Supply
Phase Voltage 5V