The magnet in the brushless motor is installed on the rotor and is one of the important parts of the brushless motor. So what requirements does the brushless motor have for the magnet? For example, magnetic performance requirements, shape, number of poles, etc., let me introduce to you today.
Where are the brushless motor magnets located?
Magnet performance requirements for brushless motors
The brushless motor mainly uses high-performance rare earth NdFeB magnets. Because the power of the motor is closely related to the performance of the magnet, it can be basically understood that the volume and grade of the neodymium magnet determine the maximum power of the motor.
Magnet Shape Requirements for Brushless Motors
The shapes of brushless motor magnets mainly include square magnets, tile-shaped (arc) magnets, ring magnets, and bread-shaped magnets.
Advantages of square-shaped magnets: simple processing, relatively cheap price, and a good choice for motors that pursue cost.
Advantages of arc magnets: The arc can ensure that the air gap between the magnet and the silicon steel sheet is always consistent, and it seems that the power and efficiency are better than the square magnet.
Advantages of bread-shaped magnets: According to professionals, they believe that this type of magnet is more effective than arc-shaped magnets.
Ring magnet advantages: easy installation, superior performance, high-end general use ring!
Number of magnet poles required for brushless motors
Common magnet types of brushless motor magnet;
You are now seeing the specifications of this magnet ring OD 13mm, bore diameter 8mm, thickness of 3.5mm, the surface of the black epoxy, due to the reason of the photo may look like a ferrite, the actual bonded ring magnets, suitable for a variety of types of motor, sensor, and electric appliances....
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N42SH grade radial hollow cylindrical magnet 6.3x3x11mm for high speed motors...
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