What material is usually used to make the magnet of a permanent magnet iron remover

The magnetic force of a permanent magnet iron remover comes from the permanent magnet installed inside it, and the magnetic performance of the permanent magnet mainly depends on the material used. The following is a detailed introduction to commonly used materials for permanent magnet iron remover magnets:

1. Ferrite: mainly includes barium ferrite and strontium ferrite. This type of permanent magnet has high resistivity and high coercive force, which can be well applied to the design of atmospheric gap magnetic circuits and is also suitable for manufacturing permanent magnets in small generators and motors. Ferrites do not contain precious metals such as nickel and cobalt. It has a wide variety of raw materials, simple processing technology, and low cost. It can be used as a substitute for aluminum nickel cobalt permanent magnets, making magnetic separators, magnetic thrust bearings, microwave devices, speakers, etc. However, its magnetic energy product is generally not high, its temperature stability is poor, its texture is brittle and fragile, and it is not suitable for making measurement instruments and magnetic devices that require precision in impact and vibration.

2. Rare earth permanent magnets: mainly made of rare earth cobalt, neodymium iron boron and other permanent magnetic materials. The former is an intermetallic compound composed of rare earth elements such as cerium, praseodymium, lanthanum, neodymium, cobalt, etc. Its magnetic energy product can reach 150 times that of carbon steel, 3-5 times that of aluminum nickel cobalt permanent magnet materials, 8-10 times that of aluminum nickel cobalt permanent magnet materials, with low temperature coefficient, stable magnetic properties, and a coercivity of up to 800KA/M. It is mainly used in magnetic systems such as low-speed torque motors, starting motors, sensors, and magnetic thrust bearings. Neodymium iron boron permanent magnet materials belong to the third generation of rare earth permanent magnet materials. Compared with the former, its residual magnetism, coercive force, and magnetic energy product are all higher than the former. It is not fragile, has good mechanical properties, low alloy density, and is conducive to the lightweight of magnetic components. However, its high magnetic temperature coefficient limits its application.

3. Composite permanent magnet material: It is made of permanent magnet powder and plastic as a binder. Due to the presence of a certain proportion of binder, its magnetic properties are significantly lower than those of corresponding magnetic materials without binder. Except for metal composite permanent magnet materials, other composite permanent magnet materials are limited by the heat resistance of adhesives, and the operating temperature is relatively low, generally not exceeding 150 degrees Celsius. Composite permanent magnet materials have high dimensional accuracy and good mechanical properties. The performance uniformity of each part of the magnet is excellent, making it easy to stop the radial orientation and multipole magnetization of the magnet. It is commonly used in the manufacturing of instruments, communication equipment, rotating machinery, magnetic therapy equipment, and sports equipment.