Battery-type electric permanent magnet and positive and reverse excitation method thereof

Abstract

The invention discloses a battery-type electric permanent magnet and a positive and reverse excitation method thereof. The electric permanent magnet comprises a battery, a controller and an electric permanent magnet body. The controller comprises excitation circuit units connected in parallel and freewheeling circuit units connected in series with the excitation circuit units one to one. Each excitation circuit unit comprises a first switch and a second switch between which an excitation coil in the electric permanent magnet body is connected. The first switch and the second switch are both single-pole double-throw switches. Both ends of an excitation coil are connected with the movable ends of the first switch and the second switch. The fixed ends of the first switch and the second switchare connected to the positive pole of the battery and the freewheeling circuit unit respectively. The freewheeling circuit units are connected to the negative pole of the battery. The battery-type electric permanent magnet of the invention has the advantages of large excitation current, a large lifting capacity, no need to wait for freewheeling time, multi-channel fast triggering and simple structure. The positive and negative excitation method of the electric permanent magnet provided by the invention has simple steps and high safety performance.

Description

technical field [0001] The invention relates to the field of magnetic devices, in particular to a storage battery type electric permanent magnet and its forward and reverse excitation methods. Background technique [0002] The principle of the battery-type electro-permanent magnet is to use the battery to supply power to the controller, so that the controller outputs a forward or reverse current to excite the excitation coil inside the electro-permanent magnet, so that the reversible magnetic steel around it is excited, and the same The same or opposite magnetic field of the permanent magnet attracts or releases the target magnetic conductor. Usually the excitation coil inside the electro-permanent magnet is a large inductive load, so when the excitation process ends, the excitation current cannot change abruptly, but requires a certain freewheeling time. Existing large-scale electric permanent magnets require a large excitation current, and the voltage and current that the...

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Problems solved by technology

Existing large-scale electric permanent magnets require a large excitation current, and the voltage and current that the battery can provide are limited. Therefore, the charging and demagnetization operations generally need to be divided into multiple groups sequentially, but each group has to wait after the completion of charging and demagnetization. The next set of operations can only be performed after the freewheeling is completed, so the charging and demagnetization time is longer

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