Magnetic flux analysis of various flux switching motors using segmental rotor for hybrid electric vehicles
Recently the researchers are much concern in flux switching motor (FSM) in which all flux producing sources are positioned in the stator with robust rotor. Development of research has been with toothed rotor structures which exploits changes of paths for the stator teeth, whilst the bipolar flux pro...
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| Main Authors: | , , , |
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| Format: | Article |
| Published: |
Journal of Electrical Systems
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8339/ http://eprints.uthm.edu.my/8339/1/AMPE2015_JES_7_.pdf |
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| Summary: | Recently the researchers are much concern in flux switching motor (FSM) in which all flux producing sources are positioned in the stator with robust rotor. Development of research has been with toothed rotor structures which exploits changes of paths for the stator teeth, whilst the
bipolar flux produces the flux linkage in the stator. Yet, the flux path through teeth of rotor takes longer cycle results in less torque generation. Therefore, in more recent work researchers have developed the use of a segmental rotor construction, which gives significant gains. The primary function of the segments in this design is to provide a defined magnetic path for conveying the field flux to adjacent stator armature coils as the rotor rotates. As this design gives shorter end-windings than with the toothed rotor structure which requires fully-pitched coils. Hence, permanent magnet FSM (PMFSM) and field excitation FSM (FEFSM) using segmental rotor have been developed. However, due to their infirmity of less torque generation inherit from less flux linkage, both existing designs have been combined and a new structure of
hybrid excitation FSM (HEFSM) is proposed. With a novelty of hybrid excitation from PM and field excitation coil (FEC), the proposed design confirms smooth flux distribution over the stator and rotor, hence promising higher torque production. Additionally, the proposed design
has also been improved by relocating the position of PM from tip of the stator pole to a new position sandwiched between the FEC slots. This paper also presents analysis and comparison of magnetic flux distribution, magnetic flux lines, flux strengthening and torque characteristics
with existing PMFSM and FEFSM at several conditions of initial, improved and optimized designs of HEFSM. The novel structure of HEFSM using segmental rotor has attained smooth
flux distribution with flux strength of 58.6mWb and maximum torque of 33.8Nm, approximately 48% more than the initial design. The final design HEFSM with segmental rotor has also
produce slightly higher performances than existing PMFSM and FEFSM, proving their suitability to be applied for hybrid electrical vehicles (EVs) |
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