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Three-phase electromotor low-speed operation circuit

2016-09-03 22:44  
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Three-phase electromotor low-speed operation circuit
The Three-phase electromotor low-speed operation circuit is as shown: Some times we need the electromotor to work in the low-speed operation state, and we do not want to use the mechanical reducer, so we can use this circuit to achieve. As the figure shows, we connect the VD1~VD3 with the three-phase winding in series, and add the normally open contact point KM2 to the three-phase winding, then we press ST1, KM1 will close, VD1, VD2 and VD3 connect with the winding, the electromotor M will operate in the low-speed state. IF we press ST2, KM2 closes to short connect the VD1, VD2 and VD3, the electromotor M will run at full speed with the rated voltage.