Silent electricity-saving type alternating current contactor

Abstract

The invention relates to a silent electricity-saving type alternating current contactor which comprises a resistor R2, a resistor R3, a resistance strain gage R7, a resistor R4 and a capacitor C1 which are sequentially connected between a positive electrode and a negative electrode of a rectifying circuit in series; an anode of D2 is connected with the connected point of the R2 and the R3; a cathode of the D2 is connected with the negative electrode of the rectifying circuit; an anode of a silicon controlled rectifier (SCR) is connected with the positive electrode of the rectifying circuit; the cathode of the SCR is connected with one end of an absorption coil L1 in the alternating current contactor; the other end of the L1 is connected with the negative electrode of the rectifying circuit; the connected point of the R3 and the R7 is connected with a first base electrode of a double base diode BT through R5; a second base electrode of the BT is connected with a control electrode of the SCR; and a transmitting electrode of the BT is connected with connecting points of the R4 and the C1. According to the silent electricity-saving type alternating current contactor disclosed by the invention, the power supply of the L1 is controlled by using resistance mutation of the R7, so that the L1 has heavy current at the beginning of electrifying and the actuation of an armature of the contactor is ensured. Meanwhile, the resistance of the R7 is quickly increased and the current of the L1 is reduced and stabilized in a holding state.

Description

technical field [0001] The invention relates to a silent power-saving AC contactor. Background technique [0002] AC contactors are widely used as breaking and control circuits for electric power. As an actuator, it can automatically control the start and operation, reverse and stop of the motor frequently and remotely. According to the capacity level of the product, it can short-term connect and break the overload exceeding several times the rated current, and it can operate 1200 times per hour. It has the advantages of safe use and low price. It is widely used in industrial and mining enterprises, transportation and automatic control systems. It is widely used in China; but there are also disadvantages such as high noise and short life. [0003] The existing AC electromagnetic contactor is composed of an attraction coil, an iron core, an armature, a contact system, an arc extinguishing system, a body or a supporting part and the like. When the coil is energized, a magne...

AI Technical Summary

Problems solved by technology

In this way, when the magnetic flux Φ1 passes through zero, Φ2 is not zero and generates suction, attracting the armature, so that the armature is always attracted by the iron core; the loss of the iron core and the loss of the short-circuit ring account for a large proportion, and although the vibration and noise are reduced, the Large power consumption, vibration and noise can not be completely eliminated

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