Temperature-Dependent Demagnetization Model of Permanent Magnets for Finite Element Analysis

Zhou, Ping; Lin, D.; Xiao, Yumin; Lambert, N.; Rahman, M.A.

doi:10.1109/tmag.2011.2172395

Cited by 131 publications

(67 citation statements)

References 8 publications

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“…The PM demagnetization curve is sensitive to temperature, while the temperature-dependent PM B-H curve can be derived in [4]. Based on a set of discrete data describing PM B-H curve at reference temperature T0, the permeability of the PM recoil line at any temperature can be modeled as:…”

Section: Demagnetization Modeling and Analysismentioning

confidence: 99%

Electromagnetic Loss Modeling and Demagnetization Analysis for High Speed Permanent Magnet Machine

2018

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This paper presents a research work on the electromagnetic loss modeling and demagnetization analysis for a high speed permanent magnet machine (HSPMM). The iron loss is estimated by improved modeling considering harmonics and rotational magnetic field effects to achieve high precision; rotor eddy current loss is researched and comprehensively investigated using finite element method (FEM). The auxiliary slot and PM beveling are also proposed to reduce the rotor eddy current loss for machine at high speed operation. Temperature-dependent PM demagnetization modeling is utilized in HSPMM FEM analysis to investigate machine performance due to temperature variation, while optimized rotor structures are proposed and comparatively researched by FEM to improve the machine anti-demagnetization capability in harsh conditions. The HSPMM temperature is estimated based on the calculated loss results and machine computational fluid dynamic (CFD) modeling. Experimental measurements on the prototype machine verify the effectiveness of the machine electromagnetic and thermal modeling in the study.Index Terms-Demagnetization, finite element method, high speed permanent magnet machine, magnetic field.

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Section: Demagnetization Modeling and Analysismentioning

confidence: 99%

Electromagnetic Loss Modeling and Demagnetization Analysis for High Speed Permanent Magnet Machine

2018

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“…Irreversible demagnetization is generally induced by the increasing temperature of motors [7] and the sudden three-phase short circuit and overcurrent that are generated by inter-turn faults [8], [9]. The irreversible demagnetization of PMs is mainly caused by the armature reaction that occurs when the demand for starting torque is high [10].…”

Section: Three Types Of Demagnetization Patterns and Pole-slot Comentioning

confidence: 99%

Demagnetization Detection for IPM-type BLDCMs According to Irreversible Demagnetization Patterns and Pole-Slot Coefficients

Kang¹,

Kim²,

Park³

et al. 2016

Journal of Power Electronics

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This paper proposes a method for detecting irreversible demagnetization using the harmonic analysis of back electromotive force (BEMF) in interior permanent magnet-type brushless DC motors. First, demagnetization patterns, such as equality, inequality, and weighted demagnetizations, are defined and classified by considering the possibility of demagnetization resulting from motor operating characteristics. Second, an available diagnostic model for the harmonic analysis of BEMFs is defined according to pole-slot coefficients because the characteristics of BEMFs under demagnetization conditions are affected by the combination of poles and slots. Third, BEMFs and their harmonic components under normal and demagnetization conditions are analyzed through simulation and experiment to verify the proposed demagnetization detection technique.

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“…For example, in the linear part of the B-H curve, for temperature below about 100 °C, the remanence Br and coercive force Hc of magnets vary linearly versus temperature, which can be expressed as [30,31]:…”

Section: Influence Of Temperature On Magnetsmentioning

confidence: 99%

Steady-State Characteristics Analysis of Hybrid-Excited Flux-Switching Machines with Identical Iron Laminations

2015

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Abstract:Since the air-gap field of flux-switching permanent magnet (FSPM) machines is difficult to regulate as it is produced by the stator-magnets alone, a type of hybrid-excited flux-switching (HEFS) machine is obtained by reducing the magnet length of an original FSPM machine and introducing a set of field windings into the saved space. In this paper, the steady-state characteristics, especially for the loaded performances of four prototyped HEFS machines, namely, PM-top, PM-middle-1, PM-middle-2, and PM-bottom, are comprehensively compared and evaluated based on both 2D and 3D finite element analysis. Also, the influences of PM materials including ferrite and NdFeB, respectively, on the characteristics of HEFS machines are covered. Particularly, the impacts of magnet movement in the corresponding slot on flux-regulating performances are studied in depth. The best overall performances employing NdFeB can be obtained when magnets are located near the air-gap. The FEA predictions are validated by experimental measurements on corresponding machine prototypes.

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Temperature-Dependent Demagnetization Model of Permanent Magnets for Finite Element Analysis

Cited by 131 publications

References 8 publications

Electromagnetic Loss Modeling and Demagnetization Analysis for High Speed Permanent Magnet Machine

Electromagnetic Loss Modeling and Demagnetization Analysis for High Speed Permanent Magnet Machine

Demagnetization Detection for IPM-type BLDCMs According to Irreversible Demagnetization Patterns and Pole-Slot Coefficients

Steady-State Characteristics Analysis of Hybrid-Excited Flux-Switching Machines with Identical Iron Laminations

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