What’s the difference between two magnets and four magnets for permanent magnet brushless motor stator?

Friends who often dismantle DC motors will find that the stator of the motor is basically two ferrite magnets. At this time, netizens will ask, why are two magnets? Can’t four magnets work? If it’s 4 magnets, can you remove 2 carbon brushes? Will it get faster? If the two ferrite magnets in the brushless DC motor are replaced by NdFeB multipole magnets, can the motor operate normally? And so on.

The two magnets of DC permanent magnet motor are two poles, similar to AC motor. So here are two carbon brushes. There are also four poles, so we need four carbon brushes. Most of the starting motors of 125 motorcycles are four magnets and four carbon brushes. It’s quadrupole. This kind of motor has lower speed and higher torque than 2-pole motor.

1527734631802536 - What's the difference between two magnets and four magnets for permanent magnet brushless motor stator?

What is the difference between two and four permanent magnet motor stator magnets?

No, removing a pair of magnets and brushes will change both speed and power.
The original use of ferrite to replace NdFeB may have an impact, coils and other appropriate adjustments, because the magnetic force of NdFeB is much larger than ferrite, of course, the most important is the cost, will increase a lot more than ferrite, so this is why ferrite magnetic steel is selected.

What is the difference between two and four permanent magnet stator magnets?

The number of blocks of the magnetic tiles of the motor with high power must be more, some of which are stacked together. Generally, if the ordinary motor uses ferrite materials, if it is to be high-speed and efficient, NdFeB will be used.

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