DC motor start circuit controlled by counter electromotive force

Published:2012/9/17 1:39:00 Author:Ecco | Keyword: DC motor start , counter electromotive force | From:SeekIC

When breaker QF is closed, pressing the start button ST will make DC contactor KM pull in, the motor M connected to R1 , R2, R3 in series is started. With the speed increaseing, the counter electromotive force increases, the voltage at both ends of the motor M is increased gradually, so that 1KM, 2KM, 3KM operate in an order, the main contacts will sequentially shorting connect R1, R2, R3, and finally the motor M is put into full pressure operation. 1KM, 2KM, 3KM are DC contactors, the pull-in coil's rated voltage must meet U1KM < U2KM < U3KM.



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