We all know that electromagnets can be switched on and off by controlling the electricity. Yet some may wonder can a permanent magnet be turned off too? Or how to turn off a permanent magnet?
In general sense, a permanent magnet remains its magnetic force permanently as that’s why it’s called. The word “permanent” means they stay magnetized for a long time. They are always on. You can’t “switch off” permanent magnets without destroying their magnetic properties, but there is a way you can make them act as though they are switched on and off. To achieve that, an on/off switch or lever needs to be added.
If you have a permanent magnet sandwiched between two magnetic materials where its orientation can be changed, you can get the magnetic force to switch on or off. Between the two iron plates is a non-magnetic section of aluminium. When the magnets poles are aligned with the alloy, no magnetism is felt at the base. When the magnets poles are aligned with the iron, the magnetic circuit is completed and the base is magnetic.
They work by connecting the magnetic fields to pole pieces or shunting the magnetic field away from the pole pieces, which are flat surfaces with two or more “conductor” strips and non-metallic spacers. They are used to attract and hold metal objects for machining of other purposes, yet by moving the lever, they “fall away” from the metal object. These units do not use any electricity.
How to Demagnetize A Permanent Magnet?
A permanent magnet contains many microscopic domains, each of them like a miniature magnet. All of these are lined up in the same orientation, so the magnet as a whole has a substantial net magnetic field. Turning off a permanent magnet is the demagnetization process of it.
Heating the magnet to high temperatures or generating a magnetic field with an alternating current in the vicinity of the magnet are two ways to demagnetize it (assuming you want to do so). The simplest way to demagnetize it, however, is with a hammer.
Demagnetization by alternating current, is the invention and production of a permanent electromagnet, which can be switched on and off by electric connection.
Each thing comes with pros and cons. And so is it with magnets. There are advantages and disadvantages for permanent and electromagnets. Is there any way we can combine the benefits of these two types of magnets together? Sure, there is.
HVR MAG, a professional manufacturer of electro-permanent magnet, focus on the research and development of this unique type of magnetic technology. We offer versatile magnetic solutions for various industrial applications, including lifting magnets, magnetic mold clamping systems, workholding magnetic chucks, magnetic grippers for robots.
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