我所做的智能家居安防系统由煤气传感器，人体红外传感器，声控传感器，门磁开关等部分组成。

I do intelligent household security system by gas sensor, infrared sensor, televox body sensor, door magnetic switch components.

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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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