关键词: 闭口槽定子, 内置式转子, 磁网络模型, 空载漏磁系数, 永磁电机

Abstract: The no-load flux leakage coefficient in permanent magnet machines serves as an indicator of the effective utilization of permanent magnets. Accurately calculating this coefficient plays a crucial role in motor design and analysis. To address this issue,a no-load magnetic flux leakage calculation method based on magnetic network model is proposed. The no-load magnetic flux distribution characteristics of the closed-slot interior permanent magnet machine are analyzed, and three primary categories of magnetic flux leakage are identified. An equivalent magnetic network model combining lumped parameter permeance and cross-shaped network permeance is established, and the calculation process of magnetic flux
leakage coefficient is given. The effects of stator slot parameters and rotor structural parameters on the leakage coefficient are systematically investigated. A 4-pole 18 - slot,power 25 kW closed-slot interior submersible permanent magnet machine is fabricated. Experimental results demonstrate the accuracy of the proposed model in calculating the no-load flux leakage coefficient for closed-slot interior permanent magnet machines reaches 95. 14%, which provided a reference for the rapid design and optimization of the interior submersible machine.

Key words: closed-slot stator, interior rotor, equivalent magnetic network model, no-load magnetic flux leakage coefficient, permanent magnet machine