基于分布磁路法的非晶合金高速磁浮直线电机悬浮力计算

doi:10.19595/j.cnki.1000-6753.tces.221852

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Abstract As a low-loss core magnetic conductive material, amorphous alloy can replace silicon steel as the ferromagnetic material of motor to greatly reduce the iron loss of high-speed maglev linear motor. In order to prove the feasibility of the application of amorphous alloy in high-speed magnetic levitation linear motor, the improved distributed magnetic circuit method was used to calculate the air gap magnetic density of silicon steel and amorphous alloy long stator linear motor, and the virtual displacement method was adopted to calculate the static levitation force of the two materials.
Firstly, the high-speed maglev linear motor has some unique structures, such as unequal pole distance between the long stator and mover, cogging on the polar surface of the mover, and discontinuity of the mover yoke. For this structure, the magnetic permeability was characterized in sections, the magnetic pressure drop was calculated in segments, and the distributed magnetic circuit method was improved. Then the accurate air gap magnetic density of silicon steel and amorphous long stator under different excitation currents was calculated. On this basis, the virtual displacement method was used to calculate the suspension force of a linear motor with a long stator made of two materials, and finite element verification was carried out. Finally, the static levitation force of this linear motor was measured, and both can meet the levitation requirements of high-speed maglev trains. The accuracy of the analytical results and the rationality of the amorphous alloy long-stator maglev linear motor were further verified.
The results of the air gap flux density of the linear motor show that the improved distributed magnetic circuit method is more accurate than the original method because the generator cogging and mover yoke's discontinuity are considered. Accordingly, the analytical calculation results of the levitation force of the silicon steel and amorphous alloy long stator linear motor show that: (1) The static levitation force of the amorphous long-stator linear motor is slightly lower than that of the silicon steel long-stator linear motor under the same excitation current; (2) The levitation force of a linear motor with a long stator made of two materials increases with the increase of excitation current, and the saturation trend of amorphous materials changes slightly faster than that of silicon steel. When the excitation current is rated at 25 A, the long stator made of two materials can meet the requirement of 40 kN suspension force of the train. When the current exceeds 30 A, the linear motors of both materials enter the saturation zone. When it reaches 45 A, the static suspension force must be no less than 90 kN to ensure the stable suspension of the train under fault. In this case, the long stator linear motor made of two materials also meets the requirements. The simulation and experimental results of the levitation force show that the improved distributed magnetic circuit method has a high accuracy in calculating the static levitation force of the linear motor.
The following conclusions can be drawn from the analysis of calculation results: (1) The air gap flux density waveform of the high-speed maglev linear motor obtained by the improved distributed magnetic circuit method agrees with the finite element simulation results. (2) The levitation force level of an amorphous alloy long stator is slightly lower than that of a silicon steel long stator. However, from the perspective of application requirements, the suspension force of amorphous alloy as long stator core material still meets the requirements of the high-speed maglev linear motor. The feasibility of using amorphous alloy instead of silicon steel as the long stator core material of linear motor in terms of static levitation force of the linear motor is verified.

Key words： High-speed maglev linear motor amorphous alloy distributed magnetic circuit method levitation force

Received: 30 September 2022

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TM359.4

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	Bao Mujian
	Sun Yuxi
	Chen Chuntao
	Zheng Xiaoqin

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Bao Mujian,Sun Yuxi,Chen Chuntao等. Calculation of Suspension Force of Amorphous Alloy High-Speed Maglev Linear Motor Based on Distributed Magnetic Circuit Method[J]. Transactions of China Electrotechnical Society, 2023, 38(14): 3678-3688.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221852 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I14/3678

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