VP17-06 Comprehensive investigation on high-frequency rotational magnetic properties of core materials for high-speed motors
Creators: Ming Yang
Yongjian Li
Shuaichao Yue
Zunyan Hu
Jianqiu Li
Qingxin Yang
Minggao Ouyang
Publisher: name: IEEE
Year: 2025

The development of electric vehicles requires the permanent magnet synchronous motors to be miniaturized and used at high speed. As a key component in motors, soft magnetic materials can directly affect the overall performance of the motor. Ultra-thin silicon steel and nanocrystalline alloys have thin strip sizes and high resistivity, which makes them have low eddy current losses at high frequencies. Meanwhile, both materials have great magnetic properties, and can better meet the design requirements of high-speed motors. However, there are usually different rotational magnetic fields in the stator yoke of the motor [1-2]. The magnetic properties and loss of core material are greatly different from those under alternating magnetization. To improve the reliability of the motor, the variation of material magnetic properties at high frequency from alternating to circular magnetization should be further studied [3]. In this paper, the rotational magnetic properties of non-oriented ultra-thin silicon steel ST100 (200Hz - 5kHz) and nanocrystalline alloy 1K107B (1kHz - 20kHz) under high-frequency conditions are measured by the novel two-dimensional magnetic properties tester shown in Fig.1. Based on the experimental results, the anisotropy of the above materials under different flux densities is analyzed. The anisotropy change of the material under circular magnetization is explained by analyzing the B-H phase difference at different flux densities and frequencies. Taking the elliptical magnetization of ST100 at 1 kHz as an example, the magnetic properties of ST100 with different levels of rotational magnetization are studied, as shown in Fig.2. The unidirectional magnetic properties of ST100 under rotational magnetization are systematically analyzed. By comparing the B-H phase difference and the H harmonic content at different conditions, the factors affecting the nonlinearity of the rotational magnetization are analyzed, and the variation of core loss under rotational conditions is investigated. It can provide theoretical and data support for the magnetic design and loss evaluation of the motor.References: [1] O. de la Barriere, C. Appino, C. Ragusa, F. Fiorillo, M. LoBue, F. Mazaleyrat, IEEE Transactions on Magnetics., Vol. 54, p.2001415 (2018). [2] S. Yue, Y. Li, Q. Yang, K. Zhang, C. Zhang, IEEE Transactions on Magnetics., Vol. 55, p.6100705 (2019). [3] L. Chen, T. Ben, H. Zhao, C. Fang, Y. Wang, AIP Advances., Vol. 9, p.035316 (2019).
The development of electric vehicles requires the permanent magnet synchronous motors to be miniaturized and used at high speed. As a key component in motors, soft magnetic materials can directly affect the overall performance of the motor. Ultra-thin silicon steel and nanocrystalline alloys have thin strip sizes and high resistivity, which makes them have low eddy current losses at high frequencies. Meanwhile, both materials have great magnetic properties, and can better meet the design requirements of high-speed motors. However, there are usually different rotational magnetic fields in the stator yoke of the motor [1-2]. The magnetic properties and loss of core material are greatly different from those under alternating magnetization. To improve the reliability of the motor, the variation of material magnetic properties at high frequency from alternating to circular magnetization should be further studied [3]. In this paper, the rotational magnetic properties of non-oriented ultra-thin silicon steel ST100 (200Hz - 5kHz) and nanocrystalline alloy 1K107B (1kHz - 20kHz) under high-frequency conditions are measured by the novel two-dimensional magnetic properties tester shown in Fig.1. Based on the experimental results, the anisotropy of the above materials under different flux densities is analyzed. The anisotropy change of the material under circular magnetization is explained by analyzing the B-H phase difference at different flux densities and frequencies. Taking the elliptical magnetization of ST100 at 1 kHz as an example, the magnetic properties of ST100 with different levels of rotational magnetization are studied, as shown in Fig.2. The unidirectional magnetic properties of ST100 under rotational magnetization are systematically analyzed. By comparing the B-H phase difference and the H harmonic content at different conditions, the factors affecting the nonlinearity of the rotational magnetization are analyzed, and the variation of core loss under rotational conditions is investigated. It can provide theoretical and data support for the magnetic design and loss evaluation of the motor.References: [1] O. de la Barriere, C. Appino, C. Ragusa, F. Fiorillo, M. LoBue, F. Mazaleyrat, IEEE Transactions on Magnetics., Vol. 54, p.2001415 (2018). [2] S. Yue, Y. Li, Q. Yang, K. Zhang, C. Zhang, IEEE Transactions on Magnetics., Vol. 55, p.6100705 (2019). [3] L. Chen, T. Ben, H. Zhao, C. Fang, Y. Wang, AIP Advances., Vol. 9, p.035316 (2019).