Bipolar stepper motor drive circuit diagram

The drive circuit of a bipolar stepper motor is shown in the figure. It uses eight transistors to drive two sets of phases. Bipolar drive circuits can drive four-wire or six-wire stepper motors at the same time. Although four-wire motors can only use bipolar drive circuits, it can significantly reduce the cost of mass production applications. The number of transistors in a bipolar stepper motor drive circuit is twice that of a unipolar drive circuit. The four lower-end transistors are usually directly driven by a microcontroller, and the upper-end transistors require a higher-cost upper-end drive circuit. The transistor of a bipolar drive circuit only needs to withstand the motor voltage, so it does not require a clamping circuit like a unipolar drive circuit.

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