Design of Novel Overhang Structure for Separated Pole-Piece Type Ferrite Magnet Motor

Title
Design of Novel Overhang Structure for Separated Pole-Piece Type Ferrite Magnet Motor
Author
이주
Keywords
Electric vehicle; EV; rotor overhang; separated pole-piece type ferrite magnet motor; FMM
Issue Date
2015-03
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON MAGNETICS, v. 51, NO 3, Page. 1-4
Abstract
A separated pole-piece type ferrite magnet motor (FMM) is a novel type of motor that can maximize reluctance torque and reduce leakage flux by separating the pole pieces and the web. However, when this type of motor has a short stack length and a large area of pole pieces, the leakage flux in the axial direction has significant influence on the motor's performance. A rotor overhang structure is one of the most crucial design parameters that compensate for the side effects of leakage flux. A conventional overhang structure increases magnetic torque but raises the level of induced voltage. This limits the operation speed range. To overcome such problems, this paper presents a novel multilevel overhang structure. Based on the unique structure of the separated pole-piece type FMM, the overhang length of the pole pieces was set to be shorter than the other parts of the rotor. It was observed that the operating speed range was widened, and more reluctance torque was generated, compared to motors with conventional overhang structures. The proposed overhang structure was optimized by 3-D finite element analysis, and the model was validated by comparing the actual experimental results with its predicted performance.
URI
http://ieeexplore.ieee.org/document/7093510/http://hdl.handle.net/20.500.11754/23223
ISSN
0018-9464; 1941-0069
DOI
10.1109/TMAG.2014.2346081
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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