scholarly journals A study on reducing eddy current loss of sleeve and improving torque density using ferrofluid of a surface permanent magnet synchronous motor

2021 ◽  
Author(s):  
Si‐Woo Song ◽  
Min‐Jae Jeong ◽  
Kwang‐Soo Kim ◽  
Ju Lee ◽  
Won‐Ho Kim
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Eddy Current Loss ◽  
Current Loss ◽  
Torque Density

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

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
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.

scholarly journals Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5082
Author(s):  
Jae-Woo Jung ◽  
Byeong-Hwa Lee ◽  
Kyu-Seob Kim ◽  
Sung-Il Kim
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Permanent Magnets ◽  
Permanent Magnet Synchronous Motor ◽  
Core Loss ◽  
Synchronous Motor ◽  
Eddy Current Loss ◽  
Equivalent Circuit Analysis ◽  
Current Loss ◽  
Interior Permanent Magnet

We designed and analyzed an interior permanent magnet synchronous motor (IPMSM) to prevent irreversible demagnetization of the permanent magnets (PMs). Irreversible demagnetization of NdFeB PMs mainly occurs due to high temperature, which should thus be minimized. Therefore, it is necessary to reduce the eddy current loss in the PM through optimal design. The shape of the rotor core was optimized using finite element analysis (FEA) and response surface methodology. Three-dimensional (3-D) FEA is required for accurate computation of the eddy current loss, but there is huge time, effort, and cost consumption. Therefore, a method is proposed for indirectly calculating the eddy current loss of PMs using 2-D FEA. A thermal equivalent circuit analysis was used to calculate the PM temperature of the optimized model. For the thermal analysis, the copper loss, core loss, and eddy current loss in PMs were estimated and applied as a heat source. Based on the results, we confirmed the stability of the optimum model in terms of the PM demagnetization.

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