An Efficient Torque Sharing Function for Optimizing the Commutation Zone Control Strategy of Switched Reluctance Motors
Yang Fan1,2,3,4, Chen Hao1,2,3,4, Li Xiaodong5, Miguel Pablo Aguirre6, Muhammad Asghar Saqib7
1. School of Electrical Engineering, China University of Mining and Technology Xuzhou 221116 China;
2. International Joint Research Center of Central and Eastern European Countries on New Energy Electric Vehicle Technology and Equipment, Xuzhou, 221008 China;
3. International Cooperation Joint Laboratory of New Energy Power Generation and Electric Vehicles of Jiangsu Province Colleges and Universities,Xuzhou 221008 China;
4. Xuzhou Key Laboratory of new energy electric vehicle technology and equipment Xuzhou 221008 China;
5. Faculty of Innovation Engineering, Macau University of Science and Technolog Macau;
6. Instituto Tecnológico de Buenos Aires, Department of Electronic Engineering Argentina;;
7. Department of Electrical Engineering, University of Engineering and Technology Pakistan
The development of electric vehicles can effectively solve the problem of energy shortage. At the same time, the torque ripple and efficiency are important characteristics of the operational performance of electric vehicles. Switched reluctance motor (SRM) is widely used in electric vehicles due to its strong robustness, fast speed, low cost. Therefore, it is very important to effectively reduce the torque ripple and improve the efficiency of switched reluctance motors. It is usually necessary to realize the following two aspects to achieve efficient control and low torque ripple: 1. Distribute more torque to the phase with stronger torque generation ability in the commutation area. The outgoing phase has higher torque generation ability at the initial position of the commutation zone. Then, more torque should be allocated to the outgoing phase in this area. The efficiency of the motor will be improved. At this situation, the actual torque can better track the reference torque when the incoming phase torque generation ability is weak. The torque ripple of the motor will also be reduced; 2. Reduce the negative torque of the motor. However, most previous studies have mainly considered one aspect. In order to solve the above problem, a new TSF control method is proposed, which divides the motor commutation area into two areas and these two areas are controlled separately. At the end of the latter area, the phase current of the outgoing phase will decrease to zero, and the negative torque can be reduced. Meanwhile, less torque will be distributed to the incoming phase when incoming phase has less torque generation ability.
Firstly, the proposed torque sharing function (TSF) based on the sigmoid function is divided into two parts in the commutation area. Then the two regions of the commutation area will be controlled separately. Secondly, a simple adaptive control strategy is adopted to obtain the relevant parameters of the proposed method. The optimal control parameters can be effectively obtained under different loads and speeds when the adaptive control strategy is adopted. In general, the complexity of the algorithm will be reduced and the computational costs will also be reduced.
The experimental results of an actual switched reluctance motor show that the peak phase current is 17A, the torque ripple is 38.89%, and the motor efficiency is 31.2% when the sinusoidal TSF control strategy is adopted at 500r/min and 0.6N·m. However, the peak phase current is 12A, the torque ripple is 20.67%, and the motor efficiency is 36.7% when the proposed TSF control strategy is adopted at 500r/min and 0.6N·m. At 1000r/min and 0.6 N·m, the peak phase current is 18.1A, the torque ripple is 47.77%, and the efficiency of the motor is 40.4% when the sinusoidal TSF control strategy is adopted. When the proposed TSF control strategy is adopted, the peak phase current is 14.5A, the torque ripple is 28.45%, and the efficiency of the motor is 44.3%. At 1500r/min and 0.6 N·m, the peak phase current is 20.7A, torque ripple is 52.22%, and the efficiency of the motor is 42.9% when the sinusoidal TSF control strategy is adopted. Under the proposed TSF control strategy, the peak phase current is 16.2A, torque ripple is 31.33%, and the efficiency of the motor is 46.1%. The results show that the peak current of the proposed control strategy will be reduced and the efficiency of the motor will also be improved at different working conditions. Meanwhile, the torque ripple will also be reduced when the proposed method is adopted. Therefore, it can be concluded that the proposed control strategy can effectively reduce the torque ripple of the motor while also improving the efficiency of the motor.
杨帆, 陈昊, 李晓东, Miguel Pablo Aguirre, Muhammad Asghar Saqib. 一种优化开关磁阻电机换相区控制策略的高效率转矩分配函数[J]. 电工技术学报, 0, (): 20235424-20235424.
Yang Fan, Chen Hao, Li Xiaodong, Miguel Pablo Aguirre, Muhammad Asghar Saqib. An Efficient Torque Sharing Function for Optimizing the Commutation Zone Control Strategy of Switched Reluctance Motors. Transactions of China Electrotechnical Society, 0, (): 20235424-20235424.
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