Abstract
This paper presents an analytical model for the computation of the electromagnetic performance in interior permanent magnet (IPM) machines that accounts for the stator and the complex rotor structure. Using the subdomain method, we propose a simplified analytical model that considers the magnetic properties of the IPM machine. The analytical solutions are derived by solving the field-governing equations in each simple and regular subdomain, i.e., magnet, barrier, air gap, slot opening, and slot, and then applying the boundary conditions to the interfaces between these subdomains. The analytical model accurately accounts for the influence of the interaction between the slots, the relative recoil permeability of the magnets, and the boundary conditions. The magnetic field and electromagnetic performance obtained using the analytical method are compared with those obtained using finite element analysis. Finally, the analytical predictions are compared with the measured data in order to confirm the validity of the methods proposed in this paper.
Highlights
Interior permanent magnet (IPM) machines outperform conventional machines in terms of efficiency, power, and torque densities, and are increasingly popular in domestic, industrial, and aerospace applications.[1]
There are three reasons that IPM machine topologies are generally considered in applications
It is challenging to describe IPM machines using an effective analytical model because of the difficult to predict flux path in the rotor structure; analytical methods remain an important tool for understanding, initial designing, and sizing permanent magnets (PMs) machines
Summary
Interior permanent magnet (IPM) machines outperform conventional machines in terms of efficiency, power, and torque densities, and are increasingly popular in domestic, industrial, and aerospace applications.[1]. It is challenging to describe IPM machines using an effective analytical model because of the difficult to predict flux path in the rotor structure; analytical methods remain an important tool for understanding, initial designing, and sizing PM machines. The FE method boasts high precision, but it is a time-consuming endeavor when every FE analysis model must be analyzed. Some hybrid models, such as combining the FE method in the iron material with an analytical solution in the air gap, have been proposed that do not sacrifice the ability for nonlinear analysis;[11,12] it is generally difficult to provide straightforward physical relationships between the performance and parameters. Combination with several key assumptions in order to compute the electromagnetic performance in IPM machines
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