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the circuit of the multifunctional protector for electric mo

2016-09-24 04:35  
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the circuit of the multifunctional protector for electric motor(1)
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.