Sensorless Control of Brushless DC Motor Based on Improved Super-Twisting Sliding Mode Observer
A sensorless control method for brushless DC motors based on an improved super-twisting sliding mode observer is proposed to address the issues of high frequency jitter and poor disturbance resistance of traditional sliding mode observers.On the basis of the super-twisting sliding mode algorithm,a linear super-twisting sliding mode observer with additional linear links is adopted to improve the observation performance,and design adaptive gain parameters to enable automatic adjustment of observer gain parameters.At the same time,in order to reduce system jitter caused by switching,the softsign function is used instead of discontinuous sign functions.In order to further improve the system's ability to resist disturbances,an active disturbance rejection control structure is added to the speed loop to enhance the stability of the system.A simulation model of the system was constructed,and the experimental results showed that the proposed method is well adapted to operate over a wide speed range,with fast tracking and estimation accuracy.
brushless DC motorsuper-twisting sliding mode observersensorless controlactive disturbance rejection control
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