Experimental Verification and 2D Equivalent Analysis Techniques of BLDC Motor With Permanent Magnet Overhang and Housing-Integrated Rotor Core

This paper proposes 2D equivalent analysis techniques for BLDC motors with 3D structures that are permanent magnet (PM) overhang and housing-integrated rotor core. These 3D structures require 3D analysis method for accuracy of analysis. However, being a time consuming process, 3D analysis method is not a suitable choice for initial motor design. In this paper, it is proposed that this limitation can be addressed by replacing 3D structures with 2D equivalent analysis techniques. First, PM overhang is corrected to have same magnetic energy as in 2D analysis model. Second, housing-integrated rotor core is corrected to consider magnetic flux in radial direction. Finally, the 2D equivalent analysis techniques is validated by comparing experimental results of electromagnetic performance with corrected and uncorrected 2D analysis models.