Analytical calculation of no-load air gap magnetic field of V-type interior permanent magnet synchronous motors

Aiming at the analytical calculation issue of the air gap magnetic field of V-type interior permanent magnet motor, a new analytical calculation model was proposed for the no-load air gap magnetic field of a V-shaped interior permanent magnet synchronous motor. This model is based on the two-dimensional accurate subdomain method. Five equivalent key criteria were proposed, the initial V-magnet motor model was replaced with an equivalent analytical magnet motor model. The analytical model was divided into five domains: stator slot, slot opening, air gap, sector region and annular-shaped region. Laplace equations were established in the stator slot, slot opening and air gap regions, and Poisson equations were established in the sector and ring regions. The variable separation method was used to solve the vector magnetic potential expression of each region, and the harmonic coefficients were obtained in the vector magnetic potential expression according to the boundary conditions and junction conditions of each solution domain. The calculation results of the finite element method were compared with the calculation results of the analytical model. The error is 0. 97%, which proves that the analytical calculation model established by the equivalent criterion can effectively calculate the no-load air gap magnetic field of the V-type interi- or permanent magnet synchronous motor. © 2023 Editorial Department of Electric Machines and Control. All rights reserved.