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Pot Magnet: an Underrated Magnetic Component

Pot Magnet: an Underrated Magnetic Component

Most users think that the production process of pot magnets is very simple, but this is not true. In order to meet various requirements, manufacturers need to consider many factors to meet the tension specified by the customers.


1. What is a pot magnet?


The magnet of a pot magnet is covered by a steel shell, which is shaped like a pot. So, we call it a pot magnet. The tensile force of the steel shell will increase through the magnetic circuit design.


The distribution of magnetic field lines of simple magnets and pot magnets can be clearly seen through simulation software. The magnetic field lines of simple magnets are freely distributed in the air. The permeability of the steel shell is much better than that of air, so the magnetic field line is easier to pass through in the steel shell than in the air. The magnetic field lines will be focused on the working surface through the introduction of the magnetic circuit.


As the figure shows, the magnetic force lines are much more focused than the simple magnet after the pot magnet is in contact with the working surface. Therefore, its pulling force is 32 times that of the simple magnet.


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2. Different components of a pot magnet


(1) Magnet: The pot magnet only shows one side, which is unlike a simple magnet. The magnetization direction of the pot magnet is axial. NdFeB, SmCo, and ferrite are suitable for the pot magnet.


(2) Steel shell: The steel shell helps the magnet to be free from cracks and debris. Most magnets are brittle, and the steel shell can ensure the threaded holes and short column insert assembly. The most important function of the steel shell is to increase the magnetic field.


(3) Spacer: The spacer can be made of plastic, epoxy, and brass. The spacer is located between the magnet and the steel shell to prevent the magnet from demagnetizing from the steel.


3. Classification of pot magnets


There are five main types of pot magnets: counterbore, rod, through-hole, internal thread, and bipolar.

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