指出了现有中小型发电机定子接地保护原理的不足。
The drawbacks of present stator ground fault protection principle for the small and medium sized generators are pointed out.
在中小型直流调速系统中，一般都取消了测速发电机，而以电枢电压作为电机转速信号。
In general, tachometer generators are eliminated in the small and medium power DC rotating speed governing systems, and armature voltage is used as motor speed signal.
电机与电器的研究领域包括：电力系统中的大型发电机、电动机，有着广泛应用的中小型电机。
The research domain of electric machinery and electric equipment includes: The large dynamo in power system, electromotor, those who having wide application is medium or small electric machinery.
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