Analysis of magnets in brushless motors
The brushless motor use electronic commutation, the coil does not move, and the magnetic pole rotates. The brushless DC motor uses a set of electronic equipment to sense the position of the permanent magnet pole through the Hall sensor. According to this perception, the electronic circuit is used to switch the direction of the current in the coil at the right time to ensure that the magnetic force in the correct direction is generated to drive Motor, so the magnet is very important for brushless motor.
Nd2Fe14B magnet called “magnet king”,Almost 100% of the "magnet king" used in brushless motors, it is worthy to use the magnet king to describe Nd2Fe14B magnet ,Nd2Fe14B magnet are the common black ferrite magnets in our lives 3 times! Of course, the price is more than 10 times that of ferrite magnets. The brushless motor ultimately belongs to the permanent magnet motor, and the power and characteristics of the permanent magnet motor completely depend on the magnet. Basically, the size and grade of the magnet determine the maximum power of the motor.
Today I mainly talked about the temperature resistance of brushless motor magnets. How much temperature does a brushless motor magnet need?
Answer: Magnets used in brushless motors generally choose more than 120°-150° temperature resistance. According to the temperature classification of neodymium iron boron: M (80-100°), H (100-120°), SH (120-150°), UH (150-180°), EH (180-200°).
How about the surface treatment of brushless motor magnets?
Brushless motor magnets generally choose electroplated nickel, and some neodymium iron boron tile magnets will choose passivation and phosphating.
Let me tell you that not all magnets can be called brushless motor magnets. First, it must be resistant to high temperatures, and second, it must be meet standard of N38H.
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