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

Zhang, Yue; McLoone, Séamus; Cao, Wenping

doi:10.1109/tmag.2017.2759247

Cited by 23 publications

(7 citation statements)

References 4 publications

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“…It is clearly shown in Fig. 7 that the incremental relative permeability is not evenly distributed on the solid rotor, which means, according to (2), that the penetration depths for a particular harmonic are different in different rotor positions. Therefore, accurate modeling of the rotor permeability is of critical importance.…”

Section: B Hybrid Excited Vpmhm Models For Determination Of Rotor Edmentioning

confidence: 96%

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Petrov

Pyrhönen

2019

IEEE Access

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High-speed induction machines equipped with a solid steel rotor are capable of achieving a high-rotating speed than other types of machines, because of their simpler and more robust rotor structure. At the same time, however, the eddy-current losses in the solid rotor may be critical, because of the high conductivity of the rotor material, which makes it easy for axial eddy currents to travel in the solid rotor. To efficiently mitigate the rotor eddy-current losses, it is important to accurately determine the rotor eddycurrent losses induced by a particular harmonic in advance. In this paper, an improved virtual permanent magnet harmonic machine (VPMHM) model equipped with a sinusoidally magnetized virtual magnet based on the finite element method (FEM) is proposed for determination of the rotor eddy-current harmonic losses. The 2-D fast Fourier transform was used to accurately analyze the time-spatial air-gap flux density harmonics. The VPMHM model was enhanced to ensure that it was able to exactly produce the required flux density harmonics in the air gap. Two algorithms for the improved VPMHM models with different hybrid excitations were proposed to determine the harmonic losses together with the other important harmonic behavior. The model was further investigated to separate the electromagnetic transients from different harmonics. Finally, the simulation time for the harmonic losses required by the enhanced VPMHM model was significantly reduced by separating the harmonic transients. All the results and conclusions presented in this paper are based on the FEM analysis. INDEX TERMS Solid-rotor high-speed induction machine (IM), finite element method (FEM), 2-D fast Fourier transform, eddy-current losses, improved virtual permanent magnet harmonic machine (VPMHM).

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Section: B Hybrid Excited Vpmhm Models For Determination Of Rotor Edmentioning

confidence: 96%

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Petrov

Pyrhönen

2019

IEEE Access

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“…The rise in temperature in the motor is primarily attributed to electromagnetic losses that occur during the motor's operation under load [26,27]. The motor's internal components have a compact structure, limiting heat dissipation generated by losses.…”

Section: Motor Loss Analysismentioning

confidence: 99%

Design and temperature field analysis of conical outer rotor hub motor

Wang,

Zhou,

et al. 2024

IEICE Electron. Express

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To make the motor perform better during operation, a conical outer rotor structure is proposed based on the traditional outer rotor permanent magnet vernier motor (PMVM) structure. The electromagnetic characteristics of PMVM and COR-PMVM are compared and analyzed. The parameters of COR-PMVM are optimized, and the motor's temperature rise is simulated and analyzed by magneto-thermal coupling. Simulation results demonstrate a 39.3% increase in electromagnetic torque of the engine, and a 33.3% reduction in torque ripple. The stator and winding can reach a temperature of 101.72 °C, whereas the rotor and permanent magnet remain cooler at 70 °C. Lastly, a temperature rise experiment is conducted on the permanent magnet motor to validate the precision of the magnetothermal coupling analysis method.

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“…Iron loss accounts for the majority of PMSM losses. The formula for calculating the iron core loss is as follows [17]:…”

Section: Core Lossmentioning

confidence: 99%

An Efficient and High-Precision Electromagnetic–Thermal Bidirectional Coupling Reduced-Order Solution Model for Permanent Magnet Synchronous Motors

Yu,

Zhao,

Goh

et al. 2023

Actuators

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The traditional electromagnetic–thermal bidirectional coupling model (EMTBCM) of permanent magnet synchronous motors (PMSMs) requires a long time to solve, and the temperature-induced torque change is not accounted for in the finite element (FE) numerical calculation of the EM field. This paper presents a precise and efficient EMTBC reduced-order solution model. The specific methods are as follows: First, a torque control technology based on the current injection method is proposed for determining the effect of temperature on the properties of EM materials and EM torque in an EM field, and the accuracy of the FE numerical calculation model is improved. Second, we use the improved EM field finite element numerical calculation model (FEMNCM) to analyze the correlation between the EM loss, the temperature, and the load, and we replace the FEMNCM with the EM field reduction model using the least-squares method. Then, we analyze the law of the PMSM’s internal temperature distribution. We choose the GA-BP algorithm with as few samples as possible and a high accuracy and stability to build the regression prediction model of the temperature field. We use this regression prediction model to replace the complex temperature field calculation. After analyzing the EMTBCM solution strategy, the original complex EMTBC numerical calculation model is substituted with iterations of the magnetic field reduction model and the temperature field regression prediction model. The FE numerical calculation is then used to validate the reduced-order model. The proposed model is validated through numerical simulations. The numerical results indicate that the proposed reduced-order EMTBC model in this paper is accurate and computationally efficient.

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

Cited by 23 publications

References 4 publications

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Design and temperature field analysis of conical outer rotor hub motor

An Efficient and High-Precision Electromagnetic–Thermal Bidirectional Coupling Reduced-Order Solution Model for Permanent Magnet Synchronous Motors

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