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12 pole magnetic ring refers to a ring-shaped magnet with 12 magnetic poles distributed on the surface of the magnetic ring, namely 6 N poles and 6 S poles, arranged alternately in N-S. Some people also call it a 6-pole magnetic ring. This number of poles is mainly used for brushless motor rotors and Hall speed detection. The following is an introduction to the application advantages of this magnetic ring.
Advantage 1: Higher signal resolution
12 pole magnetic ring magnetized by NS can form 12 magnetic poles per turn, which can be used for Hall speed detection to obtain a higher number of pulses (6 pulses/revolution).
Advantage 2: More suitable for low-speed and high torque applications
At the same frequency, the more poles there are, the lower the speed. The 12 pole magnetic ring is particularly suitable for applications that require high torque and low speed, such as electric vehicles, power tools, etc.
Magnetic pole distribution diagram for a 12-pole magnetic ring (30° per pole)
Advantage 3: Improve the smoothness of motor operation, reduce vibration and noise
When driving a motor, the number of magnetic ring poles directly affects the back electromotive force waveform and commutation characteristics. This experience difference is very obvious in brushless fans, water pumps, and small drive motors.
Advantage 4: Strong compatibility
The common stator pole numbers for small brushless motors include 9 slots, 12 slots, 18 slots, etc. The 12 pole magnetic ring has a high matching degree with these stator pole numbers, such as 12 slots to 12 poles (classic 1:1) and 9 slots to 12 poles.
The above are the four main advantages of 12 pole magnetic rings. Currently, customers mainly use injection molded ferrite, bonded neodymium iron boron, and sintered ferrite materials. If you need samples, please consult our online customer service for product prices.
Recommended specifications for 12-pole magnetic rings;
Radial 12 pole ferrite rotor magnet ring 18 x 10 x 17.5 mm
Radial 12 pole rotor ferrite ring 12 x 8.5mm 1080 Gauss
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