Magnet protection system for power fail of electromagnet

Abstract

The invention discloses a magnetic protecting system after the electromagnet loses electricity, comprising an operation and display unit, a charging module 3-phase bridge, an electricity storage circuit, a processing unit and an H bridge IGBT unit; when magnetic property is absorbed and protected, the processing unit sends a positive conductive pulse to the H bridge IGBT unit so as to positively load the voltage at the two ends of the battery onto an electromagnetic disc; and when the magnetic property is released and protected, the processing unit sends a negative conductive pulse to the H bridge IGBT unit so as to reversely load the voltage at the two ends of the battery onto the electromagnetic disc. The method for releasing and protecting the magnetic property comprises the following steps: firstly, the magnetic protecting system carries out real time monitoring to the voltage at the two ends of the electromagnetic disc; when the voltage at the two ends of the electromagnetic discis lower than a set valve, the battery loads reverse voltage to the two ends of the electromagnetic disc; and after the magnetic releasing and protecting time reaches a set value, the voltage loadingto the electromagnetic disc should be stopped. The system is characterized by easy operation and convenient maintenance, and the like, and is suitable to be widely promoted in the fields where electromagnets are used for industrial production.

Description

technical field [0001] The invention relates to a system for maintaining magnetism after power failure of an electromagnet, in particular to a system for absorbing and maintaining magnetism or discharging magnetism for an electromagnet by using a storage battery when the mains power fails. Background technique [0002] The original industrial field magnetic disk control part is made into a screen cabinet, which is bulky, bulky, and unsightly. The circuit board and power components are exposed, which is easily affected by the field environment. The industrial field environment is extremely harsh. , the dust pollution is very large, and it is easy for copper and iron filings to fall on the surface of the components. After long-term accumulation, short circuits in electrical or electronic circuits are prone to occur, resulting in damage to components, and components are exposed, without any anti-interference measures, malfunctions High rate, prone to danger. Their circuit boar...

AI Technical Summary

Problems solved by technology

[0002] The original industrial field magnetic disk control part is made into a screen cabinet, which is bulky, bulky, and unsightly. The circuit board and power components are exposed, which is easily affected by the field environment. The industrial field environment is extremely harsh. , the dust pollution is very large, and it is easy for copper and iron filings to fall on the surface of the components. After long-term accumulation, short circuits in electrical or electronic circuits are prone to occur, resulting in damage to components, and components are exposed, without any anti-interference measures, malfunctions High rate, prone to danger

Their circuit boards are all controlled by analog quantities, which are prone to temperature drift, poor intuition, and difficult to maintain. When a fault occurs, the on-site maintenance personnel do not know how to start. They can only test each point based on experience to judge the fault point. , and some tests require power transmission measurement, which increases the impact on the maintenance personnel's own safety, and accidents may occur if there is a slight carelessness

The original industrial field uses electric disks to control the magnetic preservation part. The contactor is used as the main work and isolation element. When the contactor is switched, a large electric arc is generated, which is easy to burn out the contacts and has a high failure rate.

[0003] The magnetizing part of the original electromagnetic disk control panel cabinet on site is mainly composed of a contactor and a magnetizing resistor. When the contactor is in use, it is very easy to damage. When the magnetizing part of the original electromagnetic disk control panel cabinet fails, it will cause the The heavy objects absorbed by the magnetic disk cannot be put down by magnetization, and it takes a long time to wait. For objects with magnetism and light weight, they cannot even be put down. This makes the production unable to continue. The work can only be continued after the magnetizing part of the disk control panel cabinet is repaired, resulting in delays in on-site production and the reduction in output and economic losses caused by the delays

At the same time, when the mains power failure occurs during the magnetization, the general driver's cab personnel can't judge it immediately. They need to toggle the button or the operating lever of the crane to judge the presence or absence of the mains power. Some drivers' cab personnel even need to meet with the ground personnel. Confirm whether the mains power is off or the original electric disk control panel on site is faulty. This time can range from 1 or 2 minutes to more than 10 minutes, resulting in production delays and economic losses caused by on-site production delays.

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