the circuit of the multifunctional protector for electric motor(1)

Published:2011/6/28 8:11:00 Author:Ariel Wang | Keyword: multifunctional protector , electric motor | From:SeekIC

When 51 is pressed,the AC contactor KM is conducted to pull in.Three pairs of normally open contacts are connected.The electric motor M works.The AC voltage of L2 and L3 is reduced by C1,commutated by VD1～VD4,current limited by R3,regulated by VS1 and filtered by C2.Then it generates +12V voltage.It is for the control & protection circuit.At the same time,V1 is lighted.The +12V voltage is branched by R13 and R12.It provides reference voltage for inverting input ends of N1～N3 and non-inverting end of N4.TAI～TA3 are used to detect the two-phase power supply line of electric motor.And it generates 3 voltage signals for detect at R14～R16.



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