Microstepping with nonlinear torque modulation for position tracking control in permanent magnet stepper motors

Design and research of permanent magnet synchronous motor controller for electric vehicle

“…If the driving/braking control strategy of the four‐wheel drive is inappropriate it is very easy to cause serious problems to vehicle economy and stability, such as increased energy consumption on the high adhesion road surface and sudden turn braking, which pose a serious threat to the safety of passengers. Although distributed drive vehicles have achieved good performance and have certain technical foresight, these experimental models still need a long time to be commercialized 7,8 . Motor drive systems are used in large quantities in electric vehicles, it is, therefore, necessary to balance the cost and performance of the motor in the production process 9 .…”

“…The inverter uses a space vector pulse width modulation (SVPWM) algorithm to output three‐phase alternating current, whose frequency, phase, and amplitude are determined by the rotor position signal. The PMSM has stable output torque, stable speed, and low noise, which can reduce the impact of torque fluctuations on the motor bearings and increase the service life of the whole machine system 8,15 . The main disadvantage of the PMSM is that the controller needs a high‐precision position sensor and a high‐performance processing chip 16…”