AC electromagnetic coil with protection device

Abstract

The invention belongs to an electromagnetic coil used in equipment such as an AC electromagnet and an AC contactor, more particularly relates to an AC electromagnetic coil having a protection device. The AC electromagnetic coil is composed of a coil fixing plate (1), a coil frame (3), a coil (2) and a middle iron core hole (4). The protection device is fixed between the side surface of the coil frame (3) the outer side of the coil (2) and consists of a housing (5), a connection terminal (10), and an upper-layer circuit board (8), a lower-layer circuit board (9) and an indicator (6) lamp, wherein, the upper-layer circuit board (8), the lower-layer circuit board (9) and the indicator (6) are arranged in the housing; a DC start circuit (11), a holding circuit (12), a degaussing circuit (13),a time delay circuit (14) and a power indicator lamp circuit (15) are arranged on the upper-layer and the lower-layer circuit boards (8, 9) in the protection device, and the upper-layer and the lower-layer circuit boards (8, 9) are packaged with the circuit as a whole. The AC electromagnetic coil having the protection device has prolonged service life, improved power utilization efficiency and nonoise, and has dustproof, fireproof and anti-vibration functions.

Description

technical field [0001] The invention belongs to electromagnetic coils used in equipment such as AC electromagnets and AC contactors, and particularly relates to an AC electromagnetic coil with a protection device. Background technique [0002] Traditional AC electromagnets and AC contactors are directly controlled by AC because of the pull-in and hold of the electromagnetic coil. The periodicity of AC makes the iron core periodically pull in, and the iron core produces the same vibration as the AC cycle. If the combination is unstable, it will generate noise, increase energy consumption, increase heat generation, and shorten the service life. In addition, the inductive reactance is generated by alternating current in the coil, and the size of the inductive reactance affects the magnitude of the current in the coil. The inductive reactance of the coil in the AC electromagnet and the AC contactor is very small when the iron core is not closed, and a large current will pass thr...

AI Technical Summary

Problems solved by technology

[0002] Traditional AC electromagnets and AC contactors are directly controlled by AC because of the pull-in and hold of the electromagnetic coil. The periodicity of AC makes the iron core periodically pull in, and the iron core produces the same vibration as the AC cycle. If the combination is unstable, it will generate noise, increase energy consumption, increase heat generation, and shorten the service life

In addition, the inductive reactance is generated by alternating current in the coil, and the size of the inductive reactance affects the magnitude of the current in the coil. The inductive reactance of the coil in the AC electromagnet and the AC contactor is very small when the iron core is not closed, and a large current will pass through. When the iron core of the AC electromagnet and the AC contactor electromagnet are dirty or eccentric, and the iron core is not closed tightly, the current in the coil will increase exponentially, causing the coil to burn out in a short time, resulting in accidents such as shutdown.

In mines, cement plants and other areas where the power supply voltage is unstable, when using AC electromagnets and AC contactors, it is easy to cause the iron cores of the AC electromagnets and AC contactors to not absorb tightly or the coils cannot withstand overvoltage and overcurrent and burn out, causing damage to the enterprise. loss

[0003] Existing similar products such as externally installed box-type "AC contactor energy-saving protector" and "AC contactor energy-saving coil" have good energy-saving and protective effects, but there are still deficiencies: externally installed box-type AC contactor energy-saving protector , due to space constraints, the distance between the components in the switchboard design is compact, there is no position, the wiring is more complicated, it is easy to connect the wrong wires, the installation is difficult, time-consuming and laborious; due to the excessive current during the starting process, the energy consumption is high; the starting and maintenance are completely mechanical Switch conversion, easy to wear, high failure rate, unsafe

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