Study On The Drive And Control Technology Of Hybrid Excitation Switched Reluctance Motor

Hybrid Excitation Switched Reluctance Motor-HESRM is a new genre of motor , it is created by putting permanent magnet between adjacent stators of the conventional switched reluctance motor-SRM. So it not only inherits the advantages from the conventional SRM, but also possesses many advantages of permanent magnet motor, such as its high power density, large output torque etc. It is valued to research and useful to apply.At first, the development and global application background of SRM are introduced; the advantages and disadvantages of SRM are discussed in this paper. And based on the compares between the different power converters and between the different control strategies, the advantages and disadvantages of the converters and control strategies are analyzed.Secondly, compare the HESRM and the conventional SRM, and explain the structure and working principle of HESRM in details; then a equation of electromagnetic torque is educed by the way of mathematic method. Based on the equation, a new method that can improve the deferent torque is brought forward. This new method uses the improved power converter, that can short the established time of the on-phase current and the continuous current time of the off-phase current, and the deferent torque can be increased by the method. Because of the additional permanent magnets of HESRM, the winding flux is augmented. At the same time, the augment speed of the deferent torque can be accelerated by using the improved power converter. So, the performance of the motor is improved. This theory is validated by MATHEMATIC simulation and the experiment platform which is established by the project group.Finally, the speed control system of HESRM is designed in the paper, the system uses the double closed-loop control method. And the idle load characteristics of the motor is simulated by MATLAB, then the simulated results of speed is given.