Slide mode variable structure control for BLDC electric actuator

Slide mode variable structure control method is used for designing a digital controller of BLDC electric actuator in this paper. Firstly, the mathematic model of electric actuator is built according to the selected BLDC motor. Secondly, two slide mode algorithms, proportion switching algorithm and velocity trending law algorithm, are designed for the electric actuation system. Thirdly, we design a DSP digital controller using the sliding mode variable structure control algorithms. Fourthly, the system simulation and experiment are carried out. Based on results, we get the rule about the influence on the system performance by selecting different parameters. Experiments are made in the sequence and could well validate the results of simulation. Finally, we discuss the characteristics of the two algorithms, and summarize the method to design a slide mode variable structure controller for BLDC electric actuator.