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.
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.
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