Characteristic analysis and experimental verification of the axially asymmetric structured outer-rotor type permanent magnet motor

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Abstract

In this study, we have dealt with a design characteristic of outer-rotor type permanent magnet (PM) motor applied for Engine Cooling Fan (ECF). When we design a motor with structure like this type, it is required as a requisite to consider 3-Dimensional (3-D) effect by implementing a non-linear Finite Element Analysis (FEA) due to a yoke-ceiling, which is perpendicular to the axis of rotation. We have analyzed identical models under three different conditions. The analysis has been performed through a non-linear 2-Dimensional (2-D) and 3-D FEA. Finally, the results have been compared with Back Electro-Motive Force (BEMF) value of actual motor model. As a result, a yokeceiling function as an additional flux path and the operating point on B-H curve of rotor material is shifted to non-saturation region relatively. Accordingly, magnetic flux linkage can be increased and motor size can be decreased under same input condition to satisfy ECF specification, such as torque.

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Seo, M. K., Lee, T. Y., Park, K., Kim, Y. J., & Jung, S. Y. (2016). Characteristic analysis and experimental verification of the axially asymmetric structured outer-rotor type permanent magnet motor. Journal of Electrical Engineering and Technology, 11(4), 898–904. https://doi.org/10.5370/JEET.2016.11.4.898

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