Abstract: The design scheme of common unipolar and bipolar driving circuits for BYG general series of two phase stepping motors were introduced, which illustrates control methods for two phases stepping motor theoretically and increases the flexibility of driving circuit design for stepping motor. The AT89S52 online programmable singlechip computer was used as controller in both unipolar and bipolar driving circuit designs for two phase stepping motor, and driving circuits were composed of TIP142 darlington power transistors. The structure of designed circuit is simple, and the design thread is clear. The feature, difference and selection method in use of unipolar and bipolar driving circuits design schemes were analyzed and compared in this paper.

Key words: stepping motor, driving circuit, unipolar, bipolar, controller, driver