Design and optimisation of outer-rotor hybrid excitation flux switching motor
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 ou...
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| Format: | Thesis |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/9215/ http://eprints.uthm.edu.my/9215/1/Md._Zarafi_Ahmad.pdf |
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| Summary: | 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. |
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