Method for Evaluating the Eddy Current Loss of a Permanent Magnet in a PM Motor Driven by an Inverter Power Supply Using Coupled 2-D and 3-D Finite Element Analyses

The 2-D time-stepping finite element method is adopted to systematically analyze the effect of DC supply voltage of inverter on eddy current loss in permanent magnet of PMSM for EV application. The finite element model and inverter model are built to calculate the winding currents, eddy current losses in permanent magnet and air-gap flux densities with different DC supply voltages when the motor runs in flux-weakening area. Analysis shows that, the eddy current increases significantly with the increase of DC supply voltage, although the fundamental winding current decreases. The temperature-rise experiment of permanent magnet is carried out, proving the validity of analysis.

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Loss Analysis of a Reactor under Inverter Power Supply Taking Account of Anomalous Eddy Current Loss

Journal of the Magnetics Society of Japan ◽

10.3379/msjmag.0901rg8032 ◽

2009 ◽

Vol 33 (2) ◽

pp. 54-59 ◽

Cited By ~ 1

Author(s):

Y. Gao ◽

K. Muramatsu ◽

K. Fujiwara ◽

S. Fukuchi ◽

T. Takahata

Keyword(s):

Eddy Current ◽

Power Supply ◽

Eddy Current Loss ◽

Current Loss ◽

Loss Analysis ◽

Inverter Power Supply

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Calculation and Analysis of Permanent Magnet Eddy Current Loss Fault with Magnet Segmentation

Mathematical Problems in Engineering ◽

10.1155/2016/7308631 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Bing Li ◽

Ming Li

Keyword(s):

Finite Element ◽

Permanent Magnet ◽

Eddy Current ◽

Permanent Magnet Synchronous Motor ◽

Element Model ◽

Synchronous Motor ◽

Eddy Current Loss ◽

Space Harmonic ◽

Current Loss ◽

Finite Element Software

This paper investigates the problem of calculating and analyzing the effect of the permanent magnet eddy current loss fault due to magnet segmentation. Taking an interior permanent magnet synchronous motor with inverter supplied as an example, the rated power of motor was 2.2 kW. Three-dimensional finite-element model was firstly established based on finite-element software. Then, the model mesh and boundary conditions were handled specially; permanent magnet eddy current loss fault was calculated and analyzed theoretically with magnet segmentation from space harmonic and time harmonic, respectively. Finally, calculation results were compared and explained. A useful conclusion for permanent magnet synchronous motor design has been obtained.

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Design of Axial Flux Type Permanent Magnet Coupling with Halbach Magnet Array for Optimal Performance Considering Eddy Current Loss Reduction Using 3-D Finite Element Method

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.34.18960 ◽

2018 ◽

Vol 7 (3.34) ◽

pp. 184

Author(s):

Gang Hyeon Jang ◽

Sung Won Seo ◽

Chang Woo Kim ◽

Kyung Hun Shin ◽

Junghyo Nah ◽

...

Keyword(s):

Finite Element ◽

Permanent Magnet ◽

Eddy Current ◽

Design Method ◽

Eddy Current Loss ◽

Outer Radius ◽

Loss Reduction ◽

3D Fem ◽

Axial Flux ◽

Current Loss

Background/Objectives: This study proposes and verifies a design method that considers the permanent magnet (PM) loss reduction of axial flux permanent magnet coupling (PMC), to replace mechanical coupling.Methods/Statistical analysis: In this study, the design of an axial magnetic flux PMC is performed using a three–dimensional (3D) commercial finite element (FEM) analysis program, and an optimum design is performed through parametric analysis. In addition, we designed a PMC that minimizes loss by analyzing the PM eddy current loss when using divided magnets.Findings: We found that some parameters (thickness of the PM, number of poles, ratio of inner radius to outer radius) act on the magnetic torque of the axial flux coupling. Using these results, we could obtain the design point. Further, to reduce the PM eddy current loss in the designed coupling, we used the PMs divided radially and circumferentially to obtain the magnet shape to minimize the loss. In addition, the fabricated coupling proved that the design results of the 3D FEM matched with the experimental results.Improvements/Applications: We propose an optimal design method of an axial flux PMC using 3D FEM, and a method to reduce eddy current loss using divided magnets

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Performance analysis of magnetic gear with Halbach array for high power and high speed

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209410 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 959-967

Author(s):

Se-Yeong Kim ◽

Tae-Woo Lee ◽

Yon-Do Chun ◽

Do-Kwan Hong

Keyword(s):

Permanent Magnet ◽

Eddy Current ◽

High Power ◽

High Speed ◽

Torque Ripple ◽

Eddy Current Loss ◽

Element Analysis ◽

Current Loss ◽

Halbach Array ◽

Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

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