Stepper motor subdivision drive circuit

The utility model discloses a subdividing drive circuit of a step-type motor, which mainly comprises a microprocessor and a driving module which is corresponding to a tapped-winding of the step-type motor. The subdividing drive circuit is characterized in that the driving module comprises a D/A converter which is connected with a digital output interface of the microprocessor, an electrical level transformation circuit and a power amplifying circuit, wherein the output of the power amplifying circuit is connected with an electrical connector which is connected with the tapped-winding of the step-type motor. Since the subdividing drive circuit adopts the electrical subdividing driving method based on that the subdividing drive circuit a single chip microcomputer controls and outputs the linear direct current and the voltage drives, the subdividing drive circuit has the characteristics of simple circuit and high subdividing precision, and can realize the 128 micro-step driving, the actual measurement shows that the maximum error of the circuit is 15%, and the mean square error is 3.9%.