与FWSY相比，HSY用永磁提供所需的励磁安匝，降低了励磁输入，从而减小了控制单元体积。
If compared to FWSY, much of the required MMF is provided by permanent magnets, which implies lower excitation input, and smaller size of control unit.
与FWSY相比，HSY用永磁提供所需的励磁安匝，降低了励磁输入，从而减小了控制单元体积。
If compared to FWSY, much of the required MMF is provided by permanent magnets, which implies lower excitation input, and smaller size of control unit.
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