Strength analytical solution to ultra-high-speed permanent magnet rotor considering temperature gradient and segmental permanent magnet effect

Cheng, Wenjie; Deng, Zhikai; Xiao, Longfei; Zhong, B.; Zhang, Chao

doi:10.1177/1687814019842034

Cited by 5 publications

(3 citation statements)

References 14 publications

(14 reference statements)

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“…Zhang [22] studied the influence of different protective sleeves on stress distribution using an analytical method. Chen [23,24] established a rotor stress analytical model based on the plane stress problem for a high-speed surface-mounted permanent magnet synchronous motor rotor, and then analyzed the relationship between speed, protective sleeve thickness, fit amount and rotor strength.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Magneto-Thermal Bidirectional Coupling Strength of Macro and Micro Integration for Self-Starting Permanent Magnet Hysteresis Synchronous Motors

Xiao,

Zheng,

Dou

et al. 2023

Machines

Self Cite

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High-speed permanent magnet synchronous motors (PMSMs) are usually started with the hybrid low-speed open-loop and high-speed closed-loop control mode. However, low-speed open-loop control produces large starting current, or even current overload, resulting in demagnetization and motor damage. Therefore, there is an urgent need to develop a high-speed permanent magnet synchronous motor with self-starting ability at low speed, that is, a permanent magnet hysteresis motor (PMHM). This paper takes the permanent magnet ring hysteresis column rotor structure as the research object. Firstly, the performance of this type of rotor is improved using the micro level of effective layer material AlNiCo, and the mechanical properties of AlNiCo are calculated. Secondly, based on the thick-walled cylinder theory, the analytical model for calculating the strength of the composite rotor considering the temperature effect is deduced, and the tangential and radial stress distribution for each part of the rotor under no-load and load conditions are obtained. Then, the electromagnetic losses and temperature field distribution of the rotor are obtained using the magneto-thermal bidirectional coupling finite element method. Finally, strength of the thermal rotor is analyzed by substituting the temperature rise curve function and AlNiCo parameters at the operating temperature. The comparison of the stress calculation results of the semi-analytical solution and the finite element method showed that the error between both of them is less than 5%, which verified that the semi-analytical solution can accurately analyze the thermal stress distribution of the rotor during high-speed rotation.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Magneto-Thermal Bidirectional Coupling Strength of Macro and Micro Integration for Self-Starting Permanent Magnet Hysteresis Synchronous Motors

Xiao,

Zheng,

Dou

et al. 2023

Machines

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hong et al [11] conducted a mechanical analysis according to the thickness of a metallic sleeve and shrink fitting, as well as an electromagnetic analysis considering eddy currents in a metallic sleeve. Cheng et al [12] proposed analytical models of a metallic sleeve considering three types of stress sources, interference fit, centrifugal force and temperature gradient. Ahn et al [13], Shang et al [14] and Xu et al [15] presented numerical analyses of metallic sleeves in different high speed applications.…”

Section: Introductionmentioning

confidence: 99%

Rotor Design, Analysis and Experimental Validation of a High-Speed Permanent Magnet Synchronous Motor for Electric Turbocharger

Lee

Hong

2022

IEEE Access

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We developed a high-speed surface mounted permanent magnet synchronous motor (SPMSM) and a pulse width modulation (PWM)-driven inverter for a turbocharger with an additional electrically driven compressor (TEDC). These systems operate at 70,000 rpm and are intended to fit 1.6L diesel vehicles to reduce turbo lag to within 0.4 sec. There are key issues in the design of rotors for SPM type machines. To prevent the PM from scattering during high-speed operation, a retaining sleeve is necessary in the rotor. Several studies have reported on rotor design and the effect of retaining sleeve materials, but no papers have applied appropriate modeling and analysis to composite material sleeves. In this study, a specialized tool was used to obtain accurate results for a composite material sleeve. The results of theoretical analyses and finite element analyses (FEA) of rotors with metallic and composite sleeves were compared, considering various stress sources such as interference fit, centrifugal force and temperature gradient. In addition, rotor dynamics and transient response analyses were performed using the proposed models to verify structural stability and response time. The proposed rotor was assembled with the stator and tested in connection with the 1.6L diesel engine. It was confirmed that the transient acceleration performance was improved by 49.14%.

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“…However, it is found that when the segmented magnets are under tensile stress, sleeve stress concentration will occur due to the magnet edging effect [16]. Meanwhile, the seam between the segmental PM should be filled with a certain material to decrease the stress concentration caused by edges of the segmental PM [20].…”

Section: Introductionmentioning

confidence: 99%

Rotor electrical conductivity and eddy current loss analysis of high‐speed permanent magnet machine with a novel composite rotor

Luo

Zhang

et al. 2021

IET Electric Power Appl

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The high-temperature rise of rotor permanent magnet (PM) in high-speed PM machine (HSPMM) is one of the main bottlenecks that limits the development of HSPMM. The main reason for the increase of the PM temperature is the eddy current loss caused by highfrequency harmonics. In this study, a new type of composite magnetic material is studied, which greatly reduces the electrical conductivity of the PM and thus reduces the eddy current loss under the condition of ensuring the magnetic properties. The electrical conductivity of magnetic powder composites is calculated by introducing the improved effective medium model of the magnetic powder packing coefficient. Through the calculation of the porosity of the magnetic powder composite, the effects of the particle size, gradation and shape of the magnetic powder on the electrical conductivity of the composite were obtained. The model solves the problem of calculating the electrical conductivity of the powder structure composite rotor in eddy current loss calculation. The accuracy of the calculation is verified by the four-probe method, which provides guidance for the design of a composite rotor HSPMM.

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Strength analytical solution to ultra-high-speed permanent magnet rotor considering temperature gradient and segmental permanent magnet effect

Cited by 5 publications

References 14 publications

Analysis of the Magneto-Thermal Bidirectional Coupling Strength of Macro and Micro Integration for Self-Starting Permanent Magnet Hysteresis Synchronous Motors

Analysis of the Magneto-Thermal Bidirectional Coupling Strength of Macro and Micro Integration for Self-Starting Permanent Magnet Hysteresis Synchronous Motors

Rotor Design, Analysis and Experimental Validation of a High-Speed Permanent Magnet Synchronous Motor for Electric Turbocharger

Rotor electrical conductivity and eddy current loss analysis of high‐speed permanent magnet machine with a novel composite rotor

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