Analyses on Electromagnetic and Temperature Fields of Superhigh-Speed Permanent-Magnet Generator With Different Sleeve Materials

Li, Wei Li; Qiu, H.; Zhang, Xiaochen; Cao, Junci; Yi, Ran

doi:10.1109/tie.2013.2251740

Cited by 79 publications

(38 citation statements)

References 16 publications

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“…In Eqs. (7) and (8), s is the change in radius of the segment and ds is the change in the radial dimension, as indicated in Figure 5. To maintain compatibility:…”

Section: Thick Walled Cylinder or Disk Analysismentioning

confidence: 99%

Mechanical Design of Rotors with Surface Mounted Permanent Magnets

Barrans¹,

Mallin²

2018

Electric Machines for Smart Grids Applications - Design, Simulation and Control

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Electric machines with permanent magnet rotors are becoming increasingly popular due to the high power density that they offer relative to other configurations. Where the speed of rotation is high, the magnets are typically mounted on the surface of the rotor and retained by an outer sleeve. In the literature, a variety of analytical models have been proposed to aid the mechanical design process. Many of these models contain inherent assumptions about the stress and strain field in the rotor which may not always be apparent. In this article the range of rotor stress models are presented and explained and the limitations due to the inherent assumptions are investigated. This will allow the designer of such rotors to assess mechanical performance without introducing unforeseen errors.

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“…In Eqs. (7) and (8), s is the change in radius of the segment and ds is the change in the radial dimension, as indicated in Figure 5. To maintain compatibility:…”

Section: Thick Walled Cylinder or Disk Analysismentioning

confidence: 99%

Mechanical Design of Rotors with Surface Mounted Permanent Magnets

Barrans¹,

Mallin²

2018

Electric Machines for Smart Grids Applications - Design, Simulation and Control

View full text Add to dashboard Cite

show abstract

“…One key problem of the rotor eddy current loss attenuation, which relates to the rotor temperature rise, is unique to these types of machine because of the poor heat dissipation environment of the rotor and large current harmonics under voltage-source inverter (VSI) supply. Researchers found that a conductive sleeve over the rotor can reduce the eddy current losses (ECLs) significantly, and a great deal of research has been conducted into the performance of different configurations and structure parameters [1][2][3][4]. Meanwhile, continuous efforts have been devoted to the harmonic suppression algorithm of the currents produced by VSI [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A Novel Rotor Eddy Current Loss Estimation Method for Permanent Magnet Synchronous Machines with Small Inductance and a Conductive Rotor Sleeve

Pei

Guo

et al. 2019

Energies

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Typically, permanent magnet synchronous machines (PMSMs) with small inductance can achieve a higher power density and higher power factor. Thus, in many industrial applications, more and more PMSMs are being designed with small inductance. Compared with traditional PMSMs, current harmonics in small inductance PMSMs are much more abundant, and the amplitudes are usually high. These current harmonics will cause large eddy current losses (ECLs) on the rotor, making the estimation of ECLs necessary in the design stage. Currently, ECL estimation methods are usually based on frequency order information, which cannot tell the travelling direction of the harmonic magneto-wave, resulting in the inaccuracy of the estimation. This article proposes a novel estimation method based on the mechanism of the formation of space-vector pulse width modulation (PWM), which considers both the frequency order and travelling direction of the harmonic wave, resulting in the improvement of the accuracy. Besides this, by using double Fourier analysis (DFA) instead of traditional fast Fourier analysis (FFA), the predicted frequencies of the current harmonics are more accurate and free of the troubles caused by traditional FFA-based methods. Simulation study and experiments are conducted to show the effectiveness of the proposed method.

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“…Copper plating, has high conductivity, and the advantages of copper sleeves in reducing eddy-current losses was presented [14,15], and the influence of copper layer thickness on rotor eddy-current losses and temperature distribution was analyzed. In [16], the electromagnetic and temperature fields of machine with different sleeve materials were researched.…”

Section: Introductionmentioning

confidence: 99%

Research on Strategies and Methods Suppressing Permanent Magnet Demagnetization in Permanent Magnet Synchronous Motors Based on a Multi-Physical Field and Rotor Multi-Topology Structure

Lin

et al. 2017

Energies

Self Cite

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Abstract:In this paper, a permanent magnet synchronous motor (PMSM) with sleeves on the rotor outer surface is investigated. The purpose of sleeves is to fix the permanent magnets and protect them from being destroyed by the large centrifugal force. However, the sleeve material characteristics have a great influence on the PMSM, and therewith, most of the rotor eddy-current losses are generated in the rotor sleeve, which could increase the device temperature and even cause thermal demagnetization of the magnets. Thus, a sleeve scheme design with low eddy-current losses is necessary, and a method suppressing the local temperature peak of permanent magnets is presented. The 3-D electromagnetic finite element model of a 12.5 kW, 2000 r/min PMSM with a segmented sleeve is established, and the electromagnetic field is calculated by using the finite element method. The results show the effectiveness of the presented method in reducing the eddy current losses in the rotor. Using the thermal method, it can be found that the maximum temperature position and zone of permanent magnet will change. Thus, some strategies are comparatively analyzed in order to obtain the change rule of the position and zone. The obtained conclusions may provide a useful reference for the design and research of PMSMs.

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Analyses on Electromagnetic and Temperature Fields of Superhigh-Speed Permanent-Magnet Generator With Different Sleeve Materials

Cited by 79 publications

References 16 publications

Mechanical Design of Rotors with Surface Mounted Permanent Magnets

Mechanical Design of Rotors with Surface Mounted Permanent Magnets

A Novel Rotor Eddy Current Loss Estimation Method for Permanent Magnet Synchronous Machines with Small Inductance and a Conductive Rotor Sleeve

Research on Strategies and Methods Suppressing Permanent Magnet Demagnetization in Permanent Magnet Synchronous Motors Based on a Multi-Physical Field and Rotor Multi-Topology Structure

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