Sensorless Control of Vernier Motor Based on Improved Super-twisting Sliding Mode Observer
For the position sensorless control of a vernier motor,this article analyzed the magnetic field and points out that the vernier motor generates multiple working harmonics through modulation,which required vector control based on the synthesized back EMF.Meanwhile,due to the multipole structure of the rotor,the accuracy requirements for position signals are more stringent during operation.Small position signal er-rors can cause significant control angle differences.How to ensure the observation accuracy of the vernier motor in sensorless control plays a crucial role in its operational performance.This article took an external ro-tor split tooth vernier motor as the object,analyzed its operating principle,established a mathematical model based on synthetic back EMF,and adopted a position free control strategy based on an improved super-twisit-ing sliding mode observer to ensure the steady-state and dynamic performance of the sensorless control of the vernier motor.
PMVMsynthetic back EMFsensorless controlimproved super-twisiting sliding mode observer