Electromagnetic Characteristic Analysis of High-Speed Motors With Rare-Earth and Ferrite Permanent Magnets Considering Current Harmonics

Woo, Jong-Hyeon; Bang, Tae-Kyoung; Lee, Hoon-Ki; Kim, Kyong‐Hwan; Shin, Seung-Ho; Choi, Jang-Young

doi:10.1109/tmag.2020.3016163

Cited by 18 publications

(8 citation statements)

References 7 publications

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“…Eddy current loss and wind friction loss in high-speed PM motors are prominent. The rotor eddy current loss is mainly caused by the time and space harmonics of the armature magneto-dynamic potential and the stator slotting effect [85]. For eddy current loss, there are usually two ways to calculate.…”

Section: Rotor Designmentioning

confidence: 99%

Design and Analysis of the High-Speed Permanent Magnet Motors: A Review on the State of the Art

Shen

Zhou

et al. 2022

Machines

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This paper provides an overview of the design and analysis of high-speed PM motors by focusing on prominent issues such as motor losses, temperature rise, rotor strength and vibration. The design challenges of high-speed PM motors are briefly described, and the application of various stator and rotor structures and materials is presented in electromagnetic design. Combined with the temperature distribution of the motor, various heat dissipation measures to suppress the temperature rise are summarized. Strength and dynamics analysis of the rotor are outlined with respect to the safety of rotor operation. The current status of coupled multi-physics domain design used to improve the comprehensive design capability of high-speed PM motors is reviewed. Future directions of technologies related to the design of high-speed PM motors are pointed out.

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Section: Rotor Designmentioning

confidence: 99%

Design and Analysis of the High-Speed Permanent Magnet Motors: A Review on the State of the Art

Shen

Zhou

et al. 2022

Machines

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“…Simultaneously, N s should equal N s * and the motor operation achieves a steady-state characteristic. Moreover, the current loop forces the actual currents to track the commanded current [8][9][10]. The purpose of the PWM inverter is to implement a sinusoidal three-phase AC voltage using the DC link voltage.…”

Section: Dynamic Simulation Model With Hpmsm and Svpwm Invertermentioning

confidence: 99%

“…The operating current (including harmonics) is very useful when analyzing the electromagnetic losses of HPMSMs. Compared with reference [10], the current harmonics were accurately predicted by accurately analyzing the flux linkage and inductance considering the stator end winding and rotor shaft. The estimated current was similar to the measured current in terms of the magnitude and harmonic components.…”

Section: Dynamic Simulation Model With Hpmsm and Svpwm Invertermentioning

confidence: 99%

Investigation of Electromagnetic Losses Considering Current Harmonics in High-Speed Permanent Magnet Synchronous Motor

Lee

Sung²,

Cho

et al. 2022

Energies

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This paper presents a characteristic analysis and experimental verification for predicting the electromagnetic losses in high-speed permanent magnet synchronous motors. To predict the operating characteristics (such as speed and input current), dynamic modeling is conducted that combines models for the space vector pulse width modulation (SVPWM) inverter and high-speed permanent magnet synchronous motor (HPMSM). By applying the predicted harmonic currents to the electromagnetic analysis, DC and AC copper losses of the stator winding, and eddy current loss of the rotor sleeve and rotor permanent magnet, are comprehensively analyzed using the finite element (FE) method. In particular, by analyzing the magnetic field behavior of magnetic flux density according to harmonics, a core loss analysis technique was presented. The validity of the hybrid analysis, which combines the stator copper loss and rotor eddy current loss derived from the FE analysis and the proposed core loss analysis, was verified through comparison with the experimental results under various operating conditions. Compared with the experimental results, the error of total losses using the hybrid analysis with a sinusoidal current was about 47.39%, and total losses using the hybrid analysis with a harmonic current was significantly improved to within 3.7%.

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“…Therefore, studies to find an alternative to the series of rare earth PMs are being conducted. In particular, ferrite magnets have a low residual magnetic flux density compared with the rare earth magnets, and extensive research is underway pertaining to the use of a ferrite magnet as a rare-earth substitute because of their low price and stable supply [3][4][5][6]. Therefore, studies on a model based on a ferrite magnet providing reluctance torque and on a model based on a consequent-pole (CP) structure to reduce the use of magnets are being studied.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of a Novel Consequent-Pole Interior Permanent Magnet Motor with Flared-Structured Rotor

Yoon,

You

2024

Applied Sciences

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Interior permanent magnet motors are widely used in applications requiring high power density and high efficiency due to their high torque-generating capabilities. Recently, given the price fluctuations and unstable supply of rare earth permanent magnets, alternative configurations with reduced use of permanent magnets are being sought. Among the various candidates related to this, the consequent-pole type rotor structure can halve the number of permanent magnets used compared with conventional structures. However, in a no-load analysis, the waveform of the back electromotive force becomes asymmetric, generating a harmonic component. As a result, there is a disadvantage that the torque ripple increases. To overcome these shortcomings, we propose a novel rotor structure that applies a consequent-pole structure to an embedded permanent-magnet motor structure, wherein a number of permanent magnets are arranged in a flared structure to constitute a single polarity. In the proposed flared-structured magnet arrangement, it is possible to adjust the angle of the permanent magnet and the polar angle to mitigate the asymmetry of the back-EMF waveform. The proposed structure was optimized with a genetic algorithm and a prototype of the optimal model was constructed and experimentally evaluated to verify its validity. Finally, the performance improvement and validity of the proposed structure were verified by comparing the analysis results of the optimal model with the experimental results.

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Electromagnetic Characteristic Analysis of High-Speed Motors With Rare-Earth and Ferrite Permanent Magnets Considering Current Harmonics

Cited by 18 publications

References 7 publications

Design and Analysis of the High-Speed Permanent Magnet Motors: A Review on the State of the Art

Design and Analysis of the High-Speed Permanent Magnet Motors: A Review on the State of the Art

Investigation of Electromagnetic Losses Considering Current Harmonics in High-Speed Permanent Magnet Synchronous Motor

Optimal Design of a Novel Consequent-Pole Interior Permanent Magnet Motor with Flared-Structured Rotor

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