Steady State Analysis and Open Loop Modeling of Permanent Magnet Stepper Motor

摘要

A stepper motor is an incremental actuator that can operate when driven by a digital pulse train. Of all the types of stepper motor the permanent magnet stepper motor (PMSM) is widely preferred due to it being the cheapest and its parameters such that the enhancement of its performance characteristic is still an upcoming area of research. Existing literature review shows that the determination of the transient rather than steady-state performance is in existence. In this paper linear differential equations of the PMSM are obtained from review and the steady-state equations of the PMSM in constant torque mode for a single step is resolved using numerical integration. The results are validated with the simulation carried out using MATLAB-Simulink in open loop for micro-step. It is observed that the speed of the stepper motor is dependent on the frequency of the input pulse train and the load torque.