Improved rotor structures for increasing flux per pole of permanent magnet synchronous motor
This study proposes an improved rotor structure that can increase the flux per pole of a permanent magnet synchronous motor. The air-gap flux density of the improved rotor-type motor is calculated using an equivalent magnetic circuit and compared with the calculation result that is obtained using fi...
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Published in | IET electric power applications Vol. 12; no. 3; pp. 415 - 422 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
The Institution of Engineering and Technology
01.03.2018
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Subjects | |
Online Access | Get full text |
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Summary: | This study proposes an improved rotor structure that can increase the flux per pole of a permanent magnet synchronous motor. The air-gap flux density of the improved rotor-type motor is calculated using an equivalent magnetic circuit and compared with the calculation result that is obtained using finite element analysis (FEA). In addition, the no-load fundamental air-gap flux density of the surface-mounted permanent magnet motor, interior permanent magnet motor, spoke-type motor, and improved rotor-type motor are compared using FEA. Changes in the no-load fundamental air-gap flux density according to changes in the rotor diameter and permanent magnet usage are examined for each rotor type. A comparison of the fundamental air-gap flux densities of the five rotor types, including the improved rotor-type conducted using FEA demonstrated that the air-gap flux density of the improved rotor-type was highest. A comparison of the no-load phase back EMF of the five types was conducted after designing them in the four-pole six-slot structure. Each rotor type is applied to 80 W-grade fan motors, and the torque ripple and iron loss are compared. A prototype of the improved rotor-type motor is developed, and the no-load phase back EMF and load test result are verified through experiments. |
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ISSN: | 1751-8660 1751-8679 1751-8679 |
DOI: | 10.1049/iet-epa.2017.0432 |