Demagnetization analysis of outer-rotor-type BLDC motors considering permanent magnet overhang structure
Source abstract
Abstract
This paper presents an analysis of demagnetization of an outer rotor type brushless DC (BLDC) motor with a permanent magnet (PM) overhang structure. The proposed model converts the operating points of PM to consider such a three-dimensional (3D) structure in two dimensions (2D). In addition, the rotor yoke thickness of the proposed model is increased to consider the housing rotor. Ferrite PMs require demagnetization analysis owing to their decreasing coercivity at lower temperatures compared with rare-earth PMs. Hence, demagnetization analysis is conducted using a proposed model while considering, the PM overhang structure. The demagnetization analysis results are compared with the results of proposed model and 3D FEA analyses.
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Research context
OpenAlex topics: Electric Motor Design and Analysis · Magnetic Properties and Applications · Magnetic Bearings and Levitation Dynamics
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Affiliations
Department. of Electrical Engineering, Chungnam National University 1 , 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
Department of Biosystems Machinery Engineering, Chungnam National University 2 , 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
Department of Electrical Engineering, Changwon National University 3 , Changwon 51140, Republic of Korea
Funding
Ministry of Trade, Industry and Energy · National Research Foundation of Korea
References (5)
Show source-provided references
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2. Experimental verification and 2D equivalent analysis techniques of BLDC motor with permanent magnet overhang and housing- integrated rotor core10.1109/TASC.2020.2972233 ↗
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4. Analysis of irreversible magnet demagnetization in line-start motors based on the finite-element method10.1109/tmag.2003.810330 ↗
5. Temperature coefficients of rare earth permanent magnets10.1109/20.800495 ↗