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Three-phase motor for against phase-phase short circuit comm

2016-09-04 00:08  
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Three-phase motor for against phase-phase short circuit commutation circuit
During the revering of the motor, the contactor’s main contacts may cause rather serious arcing phenomenon due to operation or for some other reasons. If the arc has not been completely extinguished, the reverse AC contactor pulls to cause phase-phase short circuit. Just as shown in the circuit, an AC contactor KM is used to solve the phase-phase short circuit. During the reversing process of positive and negative, the forward contactor KMF powers off. And the contactor KM (that is the additional one) also disconnect. Therefore, four break interrupters are created. It can effectively extinguish the arc and avoid the phase-phase short circuit failure.