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Simple three-phase motor short braking circuit

2016-09-04 02:54  
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Simple three-phase motor short braking circuit
The stator windings maintain the opening state at this moment. The EMF does not produce current and dose not produce braking torque. Thus it is called free brake. If the stator winding is disconnected from the grid as shown in the figure and is short connection by KM2, the remanence potential of the stator windings can be generated to produce current. And the resulting braking effect is called short brake”. When the 5.5kW motor short-circuit brakes, short-circuit current is with duration of 100 milliseconds. It is better than free braking, whose braking time is 3 / 4 of the free braking time.