Synchronous electric motor chokes down according to the stator current excitation circuit


Posted on Mar 28, 2007

Circuit shown in Figure 3-189. Figure, SA controls switch; SBi is closing button; SBz to trip button; Yaa de-excitation switch is closing coil; YR3 is off trip coil magnetic sw


Synchronous electric motor chokes down according to the stator current excitation circuit
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itch; figure, for the excitation switch contacts QF3 each touch point. Excitation switch, a circuit breaker is made with the restructuring. Power synchronous motor is controlled by the circuit breaker QFi. When you start, disconnect breaker QF2, synchronous motor through the reactance L is step-down start until the motor reaches synchronous speed and quasi or more, closing the circuit breaker QFz shorting reactor L, the synchronous motor running at full pressure. When the excitation switch QF3 closing, the normally closed contacts disconnect de-excitation circuit resistance RM, exciter for synchronous motor into line excitation; when QFa trip exciter exits synchronous motor field circuit, but will destroy magnetoresistance RM access synchronous motor field circuit will be de-excitation. Excitation current size can be changed by adjusting the rheostat RP. in graph. Marked virtual circuit is a light box to start the control circuit; labeled virtual circuit frame for the resumption of automatic control circuit.




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