Optimal Design and Experimental Test of Surface-Mounted Permanent Magnet Motors with Cost-Effective Magnet Utilization to Suppress Torque Pulsations.
- Title
- Optimal Design and Experimental Test of Surface-Mounted Permanent Magnet Motors with Cost-Effective Magnet Utilization to Suppress Torque Pulsations.
- Author
- 권병일
- Issue Date
- 2018-04
- Publisher
- IEEE
- Citation
- 2018 IEEE International Magnetics Conference (INTERMAG), Page. 1-1
- Abstract
- The surface-mounted permanent magnet (SPM) motors with
NdFeB magnets, offering high torque density and high efficiency, have been
widely applied to various domestic and industrial applications [1]. However,
the adoption of NdFeB magnets not only brings high torque density, but
also leads to high torque pulsations and high magnet cost. The approaches
to suppress torque pulsations in SPM motors have been heavily investigated
through drive control or motor design methods [2], [3]. In particular,
the suppression of cogging torque has received great attention along with
numerous methods, such as skewing [4], auxiliary slots [5], teeth notching
[6], and slot-opening shifting [7], etc. However, most of the methods to
suppress cogging torque may not result in low torque ripple due to the effects
of armature reaction fields. Hence, the approaches to suppress both cogging
torque and torque ripple simultaneously are more desired. It is well known
that the magnet flux density distribution has a significant effect on torque
performance. Accordingly, extensive magnet shaping methods, such as
magnet pole shape optimization [8] and sinusoidal magnet poles [9], have
been reported to obtain a sinusoidal magnet flux density distribution, thus
to reduce torque pulsations. However, these reported methods inevitably
lead to manufacturing difficulty and performance degradation. Regarding to
the magnet cost saving, the approaches by using ferrite magnets, or hybrid
ferrite and NdFeB magnets are investigated, but generally neglecting the
issues on torque pulsations [10]. In this paper, an optimal design is proposed
for the SPM motor to reduce the cogging torque and toque ripple, and save
the magnet cost using multi-grade NdFeB and ferrite magnets. Based on a
conventional SPM motor with single-grade NdFeB magnets, the proposed
SPM motor is designed with three-grade NdFeB and ferrite magnets, and
then optimized to further reduce torque pulsations and save the magnet cost
by maintaining the high average torque using the Kriging method and a
genetic algorithm. All the motor characteristics are first predicted using
the finite element method (FEM) at the same operating conditions. Then
the experimental test is performed for the optimized model to validate the
optimal design and analysis results.
- URI
- https://ieeexplore.ieee.org/document/8508733https://repository.hanyang.ac.kr/handle/20.500.11754/105467
- ISSN
- 2150-4601
- DOI
- 10.1109/INTMAG.2018.8508733
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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