A Fast Calculation Method of Electromagnetic Performance of Skewed Eccentric Brushless DC Motor
This paper investigates a fast calculation method for electromagnetic performance, including back electromotive force (EMF), cogging torque, and electromagnetic torque, of brushless DC motor (BLDCM) with skewed stator core and static rotor eccentricity. The idea of the algorithm is that the whole eccentric skewed motor is divided into several equal-thickness slices along the axial direction, and the straight slot motors are used instead of these slices to participate in the performance calculation. 2-D finite element (FE) method is adopted to calculate these straight slot motors, and the calculated results are superimposed according to the designed rules. The selection rule of slice number is discussed in detail, and the electromagnetic performance of healthy motor and eccentric motor is compared. Compared with the 3-D FE method, this method can greatly reduce the calculation amount and shorten the solution time. Experimental results show the effectiveness of the algorithm. The research results can provide reference for performance calculation of skewed eccentric BLDCM.