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4 Pole Ring Magnet

4 pole ring magnet multipole ring magnet

A 4 pole ring magnet is a specialized type of multipole ring magnet that finds extensive application in brushless DC motors including coreless motors. These magnets can exhibit either radial anisotropic or polar anisotropic properties, and are commonly designed in a cylindrical shape, often referred to as a hollow ring magnet. 

The 4 pole ring magnet offers the advantage of producing a more uniform magnetic field, which is crucial for the efficient functioning of BLDC motors. With its unique design and properties, this magnet enables motors to achieve impressive rotational speeds ranging from 130,000 to 160,000 RPM.

BLDC motor - segmented magnets
(a) 4 segmented magnets
back EMF waveform signals of segmented type
BLDC motor - 4 pole ring magnet
(b) 4 pole ring magnet
back EMF waveform signals of 4 pole ring magnet

On the right, we observe two different structures of brushless DC motors: (a) segmented magnet with a trapezoidal back electromotive force (EMF), and (b) ring magnet with a sinusoidal back EMF.

Source: A New Cost Effective Sensorless Commutation Method for Brushless DC Motors Without Phase Shift Circuit and Neutral Voltage 南台科大電機系 Adviser : Ying-Shieh.

Take the next step to boost your technological innovations with Tengye. We specialize in multipole ring magnets and our team is dedicated to providing magnet solutions that empower tech companies. Whether you need radial anisotropic or polar anisotropic 4 pole ring magnets, we’ve got you covered. Our experts will work closely with you to deliver top-notch magnet solutions tailored to your needs. Get in touch with us today to discuss your requirements and see how Tengye can help drive your technological advancements. Let’s shape a magnetic future together!

At Tengye, we empower tech companies and product designers with premium magnets and electrical/electronic components. With our technical innovation and exceptional service, we are your reliable partner for success. Backed by ISO 9001 and IATF 16949 certifications, we guarantee the highest quality standards. Contact us to explore comprehensive solutions and elevate your projects.

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Jonah Jin

Jonah Jin
Managing Director

Every customer deserves to be treated professionally and responsively.