How to choose brushless(bldc) motor magnet?

Addtime:2022-05-10 10:54:24 Click:26

Today, when I was visiting a motor forum, I found that a netizen asked how to choose the magnetic steel of the brushless DC motor? What are the effects of the remanence, coercive force and magnetic energy product of the magnetic steel in the brushless DC motor on the performance of the magnetic steel? Then there is how to select the correct magnetic steel performance parameters according to the conditions of the motor. If the parameters such as remanence are the same, what is the difference between ferrite and rare earth?

This is almost the case. In the magnetic steel, the residual magnetism br refers to the magnetic induction intensity of the magnet at this time after the magnetic field is magnetized to the technical saturation under the action of the external magnetic field of the magnet. ) Intrinsic coercive force HCJ refers to the reverse magnetic field strength required to reduce the magnetization of the magnet to zero, (whether the magnet can continue to work at high temperature and how much temperature it can withstand, mainly depends on HCJ) Magnetic energy product (BH) max refers to the product of B and H at any point in the demagnetization curve, and the maximum value of BXH is called the maximum magnetic energy product. (Comprehensive parameters, the selection of magnetic steel mainly depends on BR and HCJ)

brushless(bldc) motor magnet

What kind of magnet should the bldc motor choose?

This mainly depends on the comprehensive consideration of your application field, power, maximum operating temperature, and even original design experience, Generally, more neodymium arc magnets are used.

What is the difference between ferrite and rare earth magnets?

Both ferrite and rare earth neodymium magnets belong to permanent magnets. Permanent magnets are a general term. Sintered ferrite magnets, injection molded ferrites, sintered NdFeB magnets, bonded NdFeB magnets, etc. are all types of permanent magnets. The magnetic properties, plasticity, machinability and economy of various materials are different, depending on how you choose.

The above motor magnets can be customized by our company. Customers with drawings are welcome to send drawings to our business for quotation, and look forward to your consultation.

Brushless motors may also use the following magnets;

Bonded neodymium magnet


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Y10 4 pole ceramic ferrite ring 10 x 4.6 x 4 mm

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Axially magnetized ring magnet [price sale custom]

​Axial magnetized ring magnets can be made of neodymium, ceramic ferrite, or samarium cobalt. No matter what you want, our company can provide you with it. You can ask us for the size you want. Grade, if not available, it can also be customized for you. The ferrite ring can also be multi-pole magnetized. Welcome to inquire....

N45SH Black Coated Super Strong Arc Magnets

Under Neodymium Arc Magnets, you can find many shapes of Motor Arc Magnets, if you need a specific size, which is not available on our website, please contact us to get a factory quotation for custom Arc Magnets, delivery time....