Analysis of high speed permanent magnet synchronous motor rotor supported by air foil bearings

Lin, Hao; Geng, Haipeng; Du, Tingchen; Xu, Xin; Zhang, Yanyan; Cheng, Wenjie; Yu, Lie

doi:10.3233/jae-171157

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…Stability analysis is closely related to the rotor bearing system, and the main bearings used in high-speed PM motors are ball bearings, oil film bearings, air bearings, and magnetic levitation bearings [82]. Figure 23 shows the distribution of the various bearing schemes reported in [6,7,13,40,50,53,82,93,[123][124][125][126][127] relative to the power and speed of the high-speed PM motor.…”

Section: Rotor Dynamics Analysismentioning

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 Dynamics Analysismentioning

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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“…Ring-shaped structures are typically used in practical engineering, for example, the gear rings of planetary transmissions, 1 stators and rotors of electric motors, 2 and inner and outer rings and cages of rolling ball bearings. 3 These structures rotate eccentrically owing to manufacturing errors, installation errors, or even structural restrictions, which can significantly change the dynamic response.…”

Section: Introductionmentioning

confidence: 99%

Dynamic instability of an eccentrically rotating ring-shaped structure

Wei,

Wang,

Wang

2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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Ring-shaped structures are widely used in engineering. However, their rotation axes are typically not coincident with the geometric axes, thus resulting in a rotational centrifugal force and significant vibration. This study focuses on the dynamic instability caused by constant and time-varying eccentricities. An analytical model is established using Hamilton’s principle and the Galerkin method, in which the rotational centrifugal forces resulting from constant and time-varying eccentricities are incorporated. Based on this model, the effects of rotation, revolution, eccentricity ratio, and damping on instability behaviors are examined. The instabilities caused by constant eccentricity are predicted using eigensolutions, whereas those caused by time-varying eccentricity with single- and multifrequency components are estimated by applying the Floquét theory. The results show that the instability domains from the multifrequency eccentricity are not a simple superposition of those from the single-frequency eccentricity but contain more instability domains originating from their combinations. The instability suppressions imposed by damping and gyroscopic effects are compared. Finally, the instability domains from constant and time-varying eccentricities are verified via numerical calculations.

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“…Among these literatures, the elastic foil is designed uniformly. The application of foil bearings in high-temperature working conditions 17 and multispan rotor systems 18 has proved its thermal immunity and dynamical stability, which enhances its engineering potential in turbocharged engines, 19 microgas turbines, 20 and in generators. 21 Our laboratory experience shows that the foil bearings with enough flexibility in light load and stiffness in heavy load are beneficial to the operation of a rotor system.…”

Section: Introductionmentioning

confidence: 99%

Feasibility investigation of a compressor rotor supported by gas foil bearings with inhomogeneous bump foils

Geng

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, a rotordynamic experiment on a compressor rotor system is presented and the feasibility of gas foil bearings with inhomogeneous bump foils is verified. A push–pull device is designed to obtain the stiffness curve and the nominal clearance of foil bearings. Operating points and dynamic coefficients of the rotor system at each rotating speed are predicted. In rotordynamic analysis, an alternative model of the impeller is proposed and the critical speed is predicted by employing the finite element method, in which the dynamic coefficients of inhomogeneous foil bearings are taken into account. Compared with the experimental result, the accuracy of the prediction for the critical speed is verified to be about 14% error. Two sets of foil bearings with 22 and 41 μm nominal clearance are manufactured and tested. Test results indicate that the vibration amplitude can be greatly reduced by diminishing the bearing clearance. When foil bearings with 22 μm clearance are used, the high-order harmonic frequencies of rotor vibration are significantly inhibited, and the amplitude of the rotating frequency is obviously restricted. Thus, the foil bearing with inhomogeneous bump foils tested in this paper can meet the speed requirement of the compressor when the nominal clearance is set at 22 μm.

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Analysis of high speed permanent magnet synchronous motor rotor supported by air foil bearings

Cited by 7 publications

References 14 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

Dynamic instability of an eccentrically rotating ring-shaped structure

Feasibility investigation of a compressor rotor supported by gas foil bearings with inhomogeneous bump foils

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