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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
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Title Analysis of the Eccentric Characteristics of the Brushless Motor by the Rotor Structure
Authors Byoung-Ook Son ; Ju Lee
DOI http://dx.doi.org/10.5207/JIEIE.2010.24.12.156
Page pp.156-163
ISSN 1225-1135
Keywords Brushless Motor ; Step-Skew Rotor ; Eccentricity ; Cogging Torque ; Local Radial Force
Abstract The brushless motor is getting widely applied to the automotive component with the advantage of the high efficiency, high reliability and etc.. Most of the motor applications require the low vibration and acoustic noise. The cogging torque is the one of the main cause of the noise and vibration. The step-skewed rotor is used to reduce the cogging torque. We analyze the characteristics of the step-skewed rotor and non skewed rotor with the same stator by using 2-dimensional FEM. And then we analyze the characteristics variation according to the rotor eccentricity. The prototype is made and tested. As the results, the step-skewed rotor structure reduce the cogging torque and local radial force but it is more sensitive to rotor eccentricity.