However, placing the permanent magnet in the rotor causes it to have a magnetic polarity due to the differences in reluctance. On the other hand, IPM motors could prevent the scattering of permanent magnets during high-speed operation because the permanent magnet is embedded in the rotor. Because the permanent magnet is attached to the surface of the rotor in SPM motors, it is necessary to fabricate a non-magnetic-material tube for preventing the magnet from scattering during high-speed operation. These permanent magnet motors can be divided into two types depending on the shape of the rotor: surface-mounted permanent magnet (SPM) motors and interior permanent magnet (IPM) motors. Through the development of permanent magnet manufacturing technology, the use of permanent magnet electric motors having the advantages of high efficiency and high output power is increasing. Finally, the validity of the constructed equivalent magnetic circuit was verified by comparing the results with those obtained via the FEM analysis and experiments. We derived the stator natural frequency to evaluate the resonance possibility between the electrical frequency and the stator natural frequency. The stability of the rotor was determined by presenting a safety factor based on the maximum stress generated at the rotor for each speed. In this study, we analyzed the magnetic field characteristics of an IPM motor using its equivalent magnetic circuit while considering the magnetic saturation in the bridge region. Therefore, it is important to analyze the stress that occurs in the rotor during high-speed rotation in the rotor design stage of the IPM. When the stress generated in the bridge region exceeds the yield stress of the rotor iron core material, the bridge part is destroyed. Consequently, according to the rotor shape characteristics of the IPM, the stress is concentrated in the thin bridge region during high-speed rotation. In addition, because the rotor of the IPM rotates at a high speed directly in connection with the load, the stress generated from the rotor must be stably distributed. Thus, to design an IPM motor, the magnetic saturation effects should be considered along with the rotor shape. Therefore, in the bridge region, the magnetic saturation is generated due to the shape of the permanent magnet, which affects the magnetic flux density distribution in the air gap and the characteristics of the IPM motor. IPM motors have a specific shape of rotor in which the permanent magnets are embedded. This paper is about the magnetic field analysis of an interior permanent magnet motor (IPM motor) by using the equivalent magnetic circuit method (EMC method), which requires a small amount of computation time compared with the finite element method (FEM).
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