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To be part of a permanent magnetic motor, what are the magnets’ requirements?

Home / How to make a suitable magnets for permenent magnetic motor / To be part of a permanent magnetic motor, what are the magnets’ requirements?

NF-Magnetics
September 25, 2023
9:29 pm
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Sintered Neodymium Iron Boron (NdFeB) magnets are very powerful magnets, often with high magnetic properties, but at the same time require special handling and design to meet the requirements of motor applications.
1. Size and shape: Sintered NdFeB magnets can usually be manufactured into various shapes, such as cylindrical, square, ring, etc., to meet the design needs of the motor. Dimensions should be customized to the specific specifications of the motor to ensure optimal performance and fit.
2. Thickness: The thickness of the magnet is critical to motor performance. Typically, increasing the thickness of a magnet improves its magnetic properties, but also increases cost and weight. Therefore, these factors need to be weighed in the design to ensure optimal performance in the motor.
3. Residual magnetism (magnetic induction): Residual magnetism is the magnetism that a magnet still retains after the external magnetic field is removed. High residual magnetism ensures the motor retains its magnetism when power is removed, improving efficiency. Residual magnetism is usually expressed in terms of magnetic induction intensity (unit: Gauss or Tesla), and the specific value should be determined according to the motor design.
4. Coercivity: Coercivity is the strength of the magnetic field required for a magnet to change from a non-magnetic state to a magnetic state. For permanent magnet motors, high coercivity is usually an advantage because it improves the 5.Performance of the motor.Temperature Stability: The performance stability of permanent magnets at different temperatures is a key consideration. Generally, sintered NdFeB magnets will lose part of their magnetic properties at high temperatures, so caution needs to be considered when using them in high temperature environments.
6. Anti-corrosion and protection: Sintered NdFeB magnets are susceptible to corrosion and therefore often require surface coating or encapsulation to protect them from moisture and chemicals.

NF-Magnetics

Hi, I'm Gang, the funder of nfmagnetics.com, I’ve been running a factory in China that makes NdFeB magnets and related magnetic assemblies for several years now, and the purpose of this article is to share with you the knowledge related to magnets from a Chinese supplier’s perspective.

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