Cogging torque reduction of 6s-4p spoke-type IPMSM using a new combination of rotor design
Cogging torque is one of the vital issues in permanent magnet motors (PMM). Reducing cogging torque, which may cause vibration and acoustic noises, has become an increasingly critical issue in PMM. Low cogging torque significantly reduces acoustic noises and vibration, and enhances the positioning c...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2017
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/779/2/24p%20FATIHAH%20SHAFIQAH%20BAHRIM.pdf http://eprints.uthm.edu.my/779/1/FATIHAH%20SHAFIQAH%20BAHRIM%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/779/3/FATIHAH%20SHAFIQAH%20BAHRIM%20WATERMARK.pdf |
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| Summary: | Cogging torque is one of the vital issues in permanent magnet motors (PMM). Reducing cogging torque, which may cause vibration and acoustic noises, has become an increasingly critical issue in PMM. Low cogging torque significantly reduces acoustic noises and vibration, and enhances the positioning control of the motor for electric vehicle drive application. Therefore, this thesis exemplifies the significance of various rotor-PM configurations of three-phase 6S-4P Spoke-type (IPMSM). Initially, conventional cogging torque reduction techniques of skewing (Sk), notching (Not), radial pole pairing (Pop), and axial pole pairing (App) were analysed. Then, a new combination such as skewing with pole pairing (SkPop), skewing with pole axial pairing (SkApp), notching with pole pairing (NotPop), and notching with pole axial pairing (NotApp) were proposed and compared. The validity of the proposed designed techniques has been confirmed by 3-D Finite Element Analysis (FEA) executed in commercial JMAG designer version 14.1, under open circuit and short circuit conditions. Simulation results showed that the conventional techniques have reduced the cogging torque of 6S-4P Spoke-type IPMSM by 70.59%, 21.57%, 32.35%, and 48.04% for Sk, Not, Pop, and App respectively from the original value of 1.01Nm. The new proposed combination techniques reduce the cogging torque by 71.86%, 63.55%, 30.93%, and 51.55% for SkPop, SkApp, NotPop, and NotApp simultaneously. In addition, the cogging torque in 6S-4P Spoke-type IPMSM has been successfully reduced and the best technique is NotPop with 30.93% of cogging torque reduction, as well as the highest torque and power capabilities of 7.643 Nm and 959.03 W respectively. Finally, design analysis to improve NotPop performance has been done in this thesis. As a result, a new 6S4P Spoke-type IPMSM with low cogging torque and 19.05% torque improvement has been successfully designed. |
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