Working method of silent power-saving type alternating current contactor

Abstract

The invention relates to a working method of a silent power-saving type alternating current contactor. The working method comprises the following steps of: when a bridge-type rectification circuit is electrified, starting a relaxation oscillator and vibrating in higher frequency; a pulse signal output by a second base electrode of a double base diode in the relaxation oscillator is output from a sixth resistor and loaded to a control electrode of a thyristor, and a conduction angle of the thyristor is ensured to be at a maximum state, the direct current of a loop of a sucking coil is ensured to be a maximum value, and an armature and an iron core of the alternating current contactor are attracted instantly; when the armature and the iron core are sucked, a resistance of a resistance strain gage is increased instantly, thereby increasing charging and discharging time constants of an RC (Resistor Capacitor) circuit in the relaxation oscillator, decreasing the charging current of a capacitor, promoting the relaxation oscillator to reduce the vibration frequency, ensuring the conduction angle of the thyristor to be at a minimum state and the direct current obtained from the sucking coil to be a minimum value, and stabilizing the alternating current contactor at a sucking state due to the direct current of the minimum value.

Description

technical field [0001] The invention relates to a working method of 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 i...

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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