Control of Surface-Mounted Permanent Magnet Synchronous Motor Based on New Sliding Mode Observer
There are some problems in the sensorless control system of permanent magnet synchronous mo-tor(PMSM)using traditional sliding mode observer(SMO),such as strong chattering,large difference be-tween the actual speed and the expected speed,and fluctuations.In response to these problems,the general approach law was used in the sliding mode control instead of the constant rate reaching law of traditional sliding mode observer,and replaced the traditional signum function with a smooth Sigmoid function.At the same time,the parameters in the exponential reaching law were adaptively adjusted by the fuzzy control system,suppressed the chattering generated in sensorless control of surface-mounted PMSM,and improved the observation accuracy of SMO.The stability of method is judged and verified by using Lyapunov second method.The simulation model of PMSM control system based on sliding mode observer is built by MAT-LAB/Simulink simulation platform,and the simulation results were compared with those of traditional slid-ing mode observer.According to the research results,it can be found that the new sliding mode observer can track the position of the rotor more quickly and has better stability.
permanent magnet synchronous motorsliding mode observerapproach lawswitch functionfuzzy control system
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万方数据
维普
