In this paper, firstly, we establish the mode of the VR stepper motor on open-loop system of the stepper motor. Secondly,
we control the exciting model, realize simulation of the circuit of unipolar driver and chop constant current control.
Finally, we analyze the simulation results. And the results shows that these control methods can be applied to the actual
motion of the system, which can improve the characteristics of the motion system of the stepper motor.
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