交流调磁型永磁同步电机磁通协同调控最大转矩铜耗比控制

doi:10.19595/j.cnki.1000-6753.tces.230602

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Abstract In recent years, due to the depletion of fossil resources and the continuous intensification of air pollution, vigorously developing electric vehicles has become the consensus worldwide. However, the single excitation source motor (electric excitation motor or permanent magnet excitation motor) used in electric vehicles fails to meet multiple technical requirements simultaneously. This paper investigates an AC flux-regulation permanent magnet synchronous motor (ACFR-PMSM) and innovatively proposes a maximum torque per copper loss (MTPCL) control to improve electric vehicle drive motors'efficiency and flux regulation ability.
The investigated object is a novel ACFR-PMSM with a radial stator and windings similar to traditional radial-flux permanent magnet motors. The axial side of the rotor is equipped with an additional axial stator and windings. The radial and axial windings are independent and can be controlled separately by two independent inverters. The radial and axial magnetic circuits are coupled in the rotor.
The operation principle and mode of ACFR-PMSM are first analyzed, and the equivalent magnetic circuit model and the steady state mathematical model in the radial and axial d-q coordinate system are established. A detailed comparison of characteristics is conducted between ACFR-PMSM and traditional permanent magnet motors applied in electric vehicle drive systems. Secondly, by analyzing the inductance and output torque characteristics of ACFR-PMSM, the proposed MTPCL control principle based on radial-axial magnetic flux co-regulation is explained theoretically. Furthermore, the Lagrange multiplier and current selection exhaustive methods are used to obtain the optimal current selection scheme for MTPCL control, demonstrating good agreement between the two methods. Considering the constraints of electrical load limitation and inverter capacity, the partitioned Lagrange multiplier method obtains the optimal trajectory of the radial/axial d-q axis current of ACFR-PMSM. In addition, simulations of the classical i_d=0 vector control and the proposed MTPCL control are conducted, verifying the feasibility of the proposed MTPCL strategy. Finally, a 200 W ACFR-PMSM prototype with 6 poles and 36 slots is manufactured, and the radial/axial inverter and testing platform are specifically designed. The primary electromagnetic performance of ACFR-PPMSM and the proposed MTPCL control is tested.
The following conclusions can be drawn: (1) ACFR-PMSM has independent radial/axial AC windings and a radial-axial coupling magnetic circuit, thus possessing multiple operating modes and high control degrees of freedom. (2) MTPCL control based on radial-axial magnetic flux co-regulation is feasible and more efficient for ACFR-PMSM. (3) For the MTPCL control of ACFR-PMSM, a regional Lagrange multiplier method is proposed to obtain the best current control trajectory rapidly. (4) Through prototype testing, it is shown that the proposed MTPCL control has good dynamic performance and low copper consumption, which reduces copper consumption by 12.9% compared with the traditional i_d=0 control.

Key words： AC flux-regulation permanent magnet synchronous motor maximum torque per copper loss control magnetic flux co-regulation

Received: 26 April 2023

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TM341

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	Wang Bingdong
	Wang Daohan
	Wang Xiaoji
	Xu Guangsheng
	Wang Xiuhe

Cite this article:

Wang Bingdong,Wang Daohan,Wang Xiaoji等. A Maximum Torque Per Copper Loss Control for AC Flux-Regulation Permanent Magnet Synchronous Motor with Magnetic Flux Co-Regulation[J]. Transactions of China Electrotechnical Society, 2024, 39(12): 3630-3645.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230602 OR https://dgjsxb.ces-transaction.com/EN/Y2024/V39/I12/3630

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