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This paper proposes the rotor structure of Interior Permanent Magnet Synchronous Motor (IPMSM) using ferrite magnets that can improve the total torque. Three kinds of motor models including the basic motor model are shown, and the torque performance and the demagnetization of the magnet are discussed for each motor model. A two-dimensional finite element method is introduced to mainly analyze torque...
This paper discusses the arrangement of the flux barriers in the stator of the outer rotor type IPMSM. IPMSM usually has the flux barriers for preventing the short circuit of magnetic flux near the permanent magnet. However, the flux barriers are used in the stator to improve the efficiency in this study. A two-dimensional finite element method (2D-FEM) is introduced to analyze the various modified...
Recently, the requirement for a high efficiency motor has increased; further, considerable attention has been paid to a permanent magnet (PM) motor, which has been studied in many researches. Therefore, we have studied a line-start permanent magnet synchronous motor (LSPMM), which can start as an induction motor and operate as a PM motor. In this paper, for the purpose of calculating asynchronous...
This paper describes the better shape design of the permanent magnet to improve the efficiency in the outer rotor type of IPMSM. Using the finite element method, characteristics of the modified motors are analyzed and compared with those of the basic motor. As a result, we have found the better shape design of the permanent magnet.
Line start permanent magnet motors (LSPMMs), which consist of a squirrel-cage rotor that contains a few permanent magnets, can be considered as being more efficient than high-efficiency induction motors. However, methods to improve the starting and running characteristics of LSPMMs have not been clarified in detail. In this paper, we propose the basic concepts of an analytical calculation method of...
This paper describes the better shape design of the permanent magnet to reduce the torque ripple in interior permanent magnet synchronous motors (IPMSMs) without deteriorating other performances. We make various motor models to analyze the cogging torque and the torque ripple. Using the two-dimensional finite element method, these motor models are discussed under the same condition. As a result, we...
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