Title :
Analytical method for predicting the air-gap flux of interior-type permanent-magnet machines
Author :
Mi, Chunting ; Filippa, Mariano ; Liu, Weiguo ; Ma, Ruiqing
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Michigan, Dearborn, MI, USA
Abstract :
This paper presents an analytical method to calculate the air-gap magnetic flux of interior-type permanent-magnet (IPM) machines taking into account the assembly gap and saturation in stator and rotor. Special considerations are given to the calculation of leakage flux in the nonlinear magnetic short circuit or the "magnetic bridges." An equivalent magnetic circuit was developed, and a computer-aided graphic analysis program calculated the magnet operating point. The Norton equivalent of flux concentration structures was studied. Agreements have been obtained between the results of the analytical model, finite-element analysis, and test results on prototype motors.
Keywords :
AC motors; magnetic flux; numerical analysis; permanent magnet motors; stators; Norton equivalent; air-gap flux prediction; assembly gap; computer-aided design; computer-aided graphic analysis program; equivalent magnetic circuit; finite-element analysis; flux concentration structures; graphic theory; interior-type permanent-magnet machines; magnet operating point; magnetic bridges; nonlinear magnetic short circuit; permanent magnets; permanent-magnet motors; rotor saturation; stator saturation; Air gaps; Assembly; Bridge circuits; Circuit analysis computing; Magnetic analysis; Magnetic circuits; Magnetic flux; Nonlinear magnetics; Saturation magnetization; Stators;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.821562
