Hybrid Excitation Doubly Salient Motor Electromagnetic Design And Optimized Control

Hybrid excitation doubly salient(HEDS) motor has a simple and firm structure, dynamic response time is short, speed and pressure regulating a wide range and application fields are widely. But when the HEDS motor is running at high speed, the output torque is too low and the torque ripple is large. And HEDS motor as the new direction of doubly salient motor field to explore, theory of motor, the control method and control strategy has not in-depth study, especially in the control system design and control method is still there is no in-depth study, and in the motor speed control system, the traditional PID control has not been able to meet the needs of industry. Therefore, to solve problems of torque and to design a kind of control system which is suitable for HEDS motor are both the main contents of this article.Firstly, when the HEDS motor is running at high speed, the output torque is too low and the torque ripple is large, the application field of HEDS motor is greatly reduced.In order to solve the problem of both the above, this article from the motor structural level to improve it. By initial design formulas to estimate the structural dimensions of the motor 750 W motor and using Ansys software to establish HEDS motor model; then, the effect of the output torque of the motor is studied by adjusting the length of the motor air gap, the relative length of the stator and rotor, and the rotor pole arc, through the analysis of the torque waveform to determine the optimum structure parameters of the motor.Moreover, HEDS motor speed control strategy using vector control, when the control link uses the traditional PID control, system overshoot and anti disturbance ability is not enough to achieve the expected, and the vibration of the torque is also relatively high, especially in the face of high speed and the need for a relatively high degree of accuracy is not enough to meet the needs, thus the introduction of integral separation PID control thought. Through the comparative analysis of the experimental data of the system model in Matlab/Simulink, the results show that the integral separation PID control performance is excellent.Finally, because of the integral separation PID controller in the parameter tuning is through the experience of man-made, so it is difficult to achieve the optimization of the three parameters, relatively easy to form buffeting and excessive overshoot. Firefly(GSO) algorithm as a new bionic algorithm, according to the fluorescence mechanism of fireflies can be automatic adjustment and optimization of the three parameters of integral separation PID. However, conventional GSO algorithm has some defects, such as easy to fall into the region, slow convergence rate and lack of accuracy. In order to solve this problem, the strategy of adaptive step size is introduced, and the vector control system of HEDS motor is built on the basis of improved firefly algorithm. According to the experimental results, it is proved that the integral separation PID controller based on improved GSO algorithm has a series of advantages such as fast response, good stability and so on.