Unipolar Stepper Motor Driver Circuit

Sunday, July 8th, 2012 - Electronic Hobby

Stepper motor driver circuit is used to control a unipolar stepper motor rotation. With a stepper motor driver circuit, the stepper motor movements can be controlled in two (2) direction, by way of set logic high (1) or low (0) in the direction control input lines. In addition to the rotational direction input to the control, stepper motor driver circuit also requires a pulse stepper motor rotation control step on the path to the input clock, which controls the frequency of the pulse determines the speed of stepper motor rotation.

Unipolar Stepper Motor Driver Circuit

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Stepper motor driver circuit in the image above, using the principal components of an XOR logic IC (74LS86) and a JK flip-flop IC (74LS76). Series with both the IC is working to produce four output pulses in sequence, and the order can be reversed by applying a certain logic in the circuit. The circuit requires a clock pulse to be able to operate. Output circuit stepper motor drivers are four (pin 15, 14, 11, 10 of the IC 74LS76). Pins will generate pulses that can drive unipolar stepper motors. Stepper motor driver circuit output is still need power to drive the stepper motor driver with a great power. This is because the ability IC74LS76 in low current drain. To generate pulses with large current (about 1-3 A), can use the type TIP31 NPN power transistor as a solid state switch on the power stepper motor drivers.

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