Is the current flowing through the excitation current of synchronous motor rotor (with the current of the rotor, the equivalent of a magnet, a N pole and S pole), during normal operation, the current is generated by an external DC voltage on the rotor. Previously this DC voltage is supplied by a DC motor, and is now mostly supplied by a silicon controlled rectifier. We usually refer to the silicon controlled rectifier system as the excitation device, which can turn off and turn off the normal current and overload current.

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