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基于可控漏磁的反凸极永磁同步电机设计与优化
基于可控漏磁的反凸极永磁同步电机设计与优化
Design and optimization of reverse salient permanent magnet synchronous motor based on controllable leakage flux
Authors: Longxin Du, Xiping Liu, Jiesheng Fu, Jianwei Liang, and Chaozhi Huang
DOI:10.30941/CESTEMS.2021.00020
https://ieeexplore.ieee.org/document/9473195
In this paper, a controllable leakage flux reverse salient permanent magnet synchronous motor (CLF-RSPMSM) is designed, which has the advantages of wide speed range and low irreversible demagnetization risk. Firstly, the principle of controllable leakage flux and reverse saliency effect is introduced, and the design of the rotor flux barrier is emphatically discussed. Secondly, multiple design variables are stratified by the comprehensive sensitivity method, and the main variables are screened out. Then the relationship between the main variables and the optimization goal is discussed according to the response surface diagram. Thirdly, a sequential nonlinear programming algorithm (SNP) is used to optimize the three optimization objectives comprehensively. Finally, the electromagnetic performance of the proposed motor is compared with the initial IPM motor, the mechanical strength of the proposed rotor is analyzed, and the results verify the effectiveness of the design and optimization method of the proposed motor.
In this paper, a controllable leakage flux reverse salient permanent magnet synchronous motor (CLF-RSPMSM) is designed by combining the characteristics of controllable leakage flux and reverse saliency. Fig.1 shows the rotor topology evolution of the three motors. The proposed motor is shown in Fig. 1(c). First, an elliptical magnetic barrier is set at the edge of the rotor along the q-axis to form two leakage flux bypasses. It can not only reduce the q-axis inductance, but also provide a variable path for leakage flux under different working conditions. Secondly, the arc-shaped magnetic barrier close to the inside of the rotor can reduce q-axis inductance. The parallel magnetic barriers on both sides of the d-axis magnetic circuit can not only prevent the strong cross-coupling magnetic saturation between the d-axis and the q-axis, but also reduce torque ripple. Finally, a magnetic bridge is added between the V-shaped PMs, which can effectively increase the d-axis inductance and obtain the reverse saliency characteristic of Ld>Lq.
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Based on the above analysis, in order to achieve the best performance of all aspects of the proposed motor, multiple parameters need to be comprehensively optimized to obtain the optimal value. Firstly, the optimization objectives of CLF-RSPMSM are determined, which are electromagnetic torque, torque ripple and reverse saliency ratio of Ld/Lq. According to the previous design experience and motor size to determine the design variables and ranges, as shown in Fig.2. Secondly, sensitivity method is used to analyze the influence degree and trend of multiple design variables on the optimization objectives. In order to improve the overall optimization efficiency of the motor, the comprehensive sensitivity analysis method is used to select the primary variables. The response surface is used to analyze the influence of several primary variables on the optimization objectives. Finally, in order to make a reasonable trade-off design among the three optimization objectives, a sequential nonlinear programming method is adopted to obtain the comprehensive optimal solution, as shown in Fig.3.
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Fig.2. Parameterization of the proposed CLF-RSPMSM rotor structure
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Fig.3. The relationship between the three optimization objectives
In order to verify the effectiveness of the proposed motor design and optimization method, the electromagnetic performance of the CLF-RSPMSM is evaluated by comparing the initial IPM motor. The research results show that the d-axis inductance of the proposed motor is greater than the q-axis inductance at different current amplitudes, and the reverse saliency characteristic is obtained. Since the proposed motor adds a magnetic bridge at the d-axis, the PM appears self-leakage. Although the optimized electromagnetic torque has been improved, it is still smaller than that of the initial IPM motor. The optimized torque ripple of the proposed motor is much smaller than that of the initial IPM motor. In addition, the speed range of the proposed motor is increased by 3400 rpm compared to the initial IPM motor. On the one hand, the d-axis inductance of the CLF-RSPMSM is larger than that of the initial IPM motor. On the other hand, the proposed motor has controllable leakage flux characteristic. During the high-speed flux-weakening operation, the q-axis current decreases, the inter-pole leakage flux increases, the main PM flux decreases, and the motor operating speed increases accordingly. Then the iron loss of the CLF-RSPMSM in the flux-weakening state is also much smaller than that of the initial IPM motor. At the same time, the PM of the proposed motor have strong resistance to irreversible demagnetization under different magnetization states. Moreover, the irreversible demagnetization risk of the proposed motor is much smaller than that of the initial IPM motor under different large currents.
In this paper, a controllable leakage flux reverse salient permanent magnet synchronous motor is introduced. By designing the magnetic barrier reasonably, the controllable leakage flux characteristic and the reverse saliency characteristic is realized. Then, a comprehensive sensitivity method and multi-objective optimization method are used to optimize the design objectives of the proposed motor. Finally, the performance of the CLF-RSPMSM and the initial IPM motor are compared and analyzed. The results show that the CLF-RSPMSM has smaller torque ripple, better flux-weakening ability, wider speed range, lower iron loss and stronger resistance to demagnetization. The rationality of the proposed motor design and optimization method is also verified.
引用本文
L. X. Du, X. P. Liu, J. S. Fu, J. W.Liang and C. Z.Huang, "Design and optimization of reverse salient permanent magnet synchronous motor based on controllable leakage flux," CES Transactions on Electrical Machines and Systems, vol. 5, no. 2, pp. 163-173, June 2021,
DOI: 10.30941/CESTEMS.2021.00020.
本文作者
LONGXIN DUwas born in China, in 1997. He received his B.S. degree in Electrical Engineering and Automation from Hunan University of Engineering, Hunan, China, in 2019. He is presently working toward his M.S. degree in Control Engineering at the Jiangxi University of Science and Technology, Ganzhou, China. His current research interests include the design of permanent magnet motors, the controllable leakage flux PMSMs and their multi-objective optimization method.
XIPING LIU received his B.S. degree from Hohai University, Nanjing, China, in 1999; his M.S. degree from the Jiangxi University of Science and Technology, Ganzhou, China, in 2004; and his Ph.D. degree in Electrical Engineering from Southeast University, Nanjing, China, in 2009. He is presently working as a Professor in the Department of Electrical Engineering and Automation, Jiangxi University of Science and Technology. His current research interests include the analysis and design of permanent magnet synchronous machine, and wind power technology.
JIESHENG FU was born in China, in 1992. He received his B.S. degree in Electrical Engineering and Automation from Jiangxi University of Science and Technology, Jiangxi, Ganzhou, China, in 2016. He is presently working toward his M.S. degree in Control engineering at the Jiangxi University of Science and Technology, Jiangxi, Ganzhou, China. His current research interests include the design and optimization of permanent magnet motor for electric vehicle.
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