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Design and optimisation of outer-rotor hybrid excitation flux switching motor

Ahmad , Md. Zarafi (2016) Design and optimisation of outer-rotor hybrid excitation flux switching motor. PhD thesis, Universiti Tun Hussein Onn Malaysia.


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Permanent Magnet Flux Switching Motor (PMFSM) with outer-rotor configuration recently reported in the literature can potentially lead to a very compact in-wheel electric vehicle (EV) drive design and increased cabin space through the elimination of mechanical transmission gears. Nevertheless, the output torque is still insufficient to drive heavier EV especially at starting and climbing conditions. On the other hand, with the permanent magnets placed along the radial V-shaped segmented stator, the PMFSM is prone to excitation flux leakage and demagnetization, making optimisation of the rotor and stator dimensions a difficult objective to achieve, while keeping the PM volume constant. In this thesis, design and optimisation of high torque capability salient stator outer-rotor hybrid excitation flux switching motor (OR-HEFSMs) are investigated. With the additional DC field excitation coil (FEC) as a secondary flux source, the proposed motor offers advantage of flux control capability that is suitable for various operating conditions. The design restrictions and specifications of the proposed motor are kept similar as interior permanent magnet synchronous motor (IPMSM) employed in the existing hybrid electric vehicle (HEV) Toyota Lexus RX400h. The JMAG-Designer ver.14.1 was used as 2D-finite elements analysis (FEA) solver to verify the motor’s operating principle and output torque performance characteristics. The subsequent optimisation work carried out using deterministic optimisation approach (DOA) has produced a very promising 12S-14P OR-HEFSM configuration, where a maximum torque density of 12.4 Nm/kg and power density of 5.97 kW/kg have been obtained. These values are respectively 30% and 68% more than that produced by IPMSM of comparable dimensions. A reduced-scale prototype 12S-14P OR-HEFSM has also been fabricated to minimize the manufacturing cost and no-load laboratory measurements have been carried out to validate the simulation results. The results obtained show that they are in good agreement and has potential to be applied for in-wheel drive EV.

Item Type: Thesis (PhD)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2000-2891 Dynamoelectric machinery and auxiliaries
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 02 Aug 2017 09:09
Last Modified: 02 Aug 2017 09:09
URI: http://eprints.uthm.edu.my/id/eprint/9215
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