Research Of Multi-modal Switch Control Algorithm Of Hybrid Excitation Synchronous Motor For Electric Vehicles

HESM combines the advantages of both PMSM and electrically excited synchronous motor, which overcomes their deficiencies. So in the field of electric vehicles the value of HESM is very high, which is becoming a new hotspot. However, its control system has not yet formed a mature theory, especially how to coordinate the relationship between armature current and field current, which having a lot of work still needs to be further depth researched. Therefore, HESM multi-modal switching algorithm is proposed to achieving motor dynamic switching. The control idea is that the motor control is divided into conventional torque and dynamic enhanced magnetic zone. Determine the area switching by current distributor, different zones with using different control methods, the motor can exhibit good dynamic performance. Meanwhile, the function of the algorithm is realized by hardware platform and software system. The entire drive system is tested and analysed.Firstly, under the the background of energy crisis, development meaning of electric vehicles and significance of this paper is explained. At the same time, study status of the structure and control algorithm of HESM is analyzed. Further, operating characteristics of HESM sample is researched. And the mathematical model of the motor is established under the stator and rotor coordinates. Under different coordinates, flux equation, voltage equation, the power equation and torque equation are given. The multi-modal switch algorithm is researched, based on HESM mathematical model.Secondly, according to the mathematical model and multi-modal switch algorithm, HESM driver system software is designed with analysing hardware platform. Based on the modular idea, the software system interruption, sampling, PID and SVPWM routines are taken modular design and analysed.At last. HESM generation and experimental studies conducted with load are tested by motors testing experimental platform. Experimental tests includeing:motor power experiment, the motor running experiments and multi-modal switch experiments. Experiments show that the proposed multi-modal switch algorithm can effectively increase torque at rated speed or below. And the motor is running stable, having good dynamic performance.