Rotordynamics modelling and analysis of high‐speed permanent magnet electrical machine rotors

Huang, Ziyuan; Le, Yun

doi:10.1049/iet-epa.2017.0739

Cited by 15 publications

(7 citation statements)

References 19 publications

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“…ere are two major methods: finite element method (FEM) and transfer matrix method (TMM). In FEM, rotors are divided into the small elements and analyzed through the FEM software, which has the advantage of high accuracy [6]. e dynamic characteristics of the misaligned rigid rotor system were analyzed based on FEM [7].…”

Section: Introductionmentioning

confidence: 99%

A Modified Transfer Matrix Method for Modal Analysis of Stepped Rotor Assembly Applied in the Turbomolecular Pump

Zhang

Tang

Tong

2022

Shock and Vibration

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An accurate modal analysis of the stepped rotor assembly is significant in the design process of rotors. The transfer matrix method (TMM) is widely used in the modal analysis of the rotor. However, the influences of the step and the assembling modes are not considered in the traditional TMM. In this paper, a modified transfer matrix method is presented for the modal calculation of the rotor in the turbomolecular pump. The stiffness reduction of stepped segments and the effect of assembled components are considered in this modified method. First of all, the traditional transfer matrix model is built. Then, the stepped segments of the rotor are changed into conical segments and the lumped mass model of conical segments is calculated. Next, the conicities of conical segments are analyzed and relations between conicities and dimensions of the rotor are discovered. Finally, the stiffness factors which can describe the effects of different assembling modes are introduced and optimized. The optimized stiffness factors are analyzed and explained from the perspective of contact stress. The modal of the stepped rotor assembly could be computed with high accuracy by using this method.

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Section: Introductionmentioning

confidence: 99%

A Modified Transfer Matrix Method for Modal Analysis of Stepped Rotor Assembly Applied in the Turbomolecular Pump

Zhang

Tang

Tong

2022

Shock and Vibration

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“…These combined factors affect the rotor stiffness, thus changing the natural frequency [26], [27]. However, few researches can be found about the thermal-structure-rotor dynamics coupling theory of HSPMMs till now, and the influence of temperature on rotor dynamics has been neglected in previous studies [8], [14], [20], [28].…”

Section: Introductionmentioning

confidence: 99%

Rotor Stress and Dynamics Analysis of a High-Speed Permanent Magnet Machine for a Micro Gas Turbine Considering Multiphysics Factors

2020

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For high-speed permanent magnet machines (HSPMMs), the precise analysis of rotor stress and rotor dynamics is essential to ensure the stable operation of rotor under high-speed conditions. This work conducts an in-depth research on the rotor of an HSPMM for a micro gas turbine with predetermined geometrical sizes. Firstly, the mechanical and electromagnetic losses are investigated by both, empirical methods and finite element method (FEM) respectively, and then the 3D steady-state temperature distribution of the HSPMM is evaluated on this basis. Then, considering the non-isothermal temperature field of the rotor, the 3D thermal-structural coupling method is adopted to analyze the influence of the carbon fiber wrapping direction and the epoxy resin adhesive between permanent magnets (PMs) and rotor core on the rotor thermal stress. Furthermore, in the steady-state thermal field, considering the change in elastic modulus and the generation of thermal stress caused by temperature rise, the results of the modal analysis are compared with those of room temperature to analyze the effect of temperature on the natural frequency of the rotor. Finally, two prototypes of 80 kW, 60000 rpm HSPMMs are fabricated to test the capability of the HSPMM. The experimental results of back-to-back drag test and modal test verify the accuracy of the temperature characteristics and modal analysis, respectively.INDEX TERMS Coupling analysis, high-speed permanent magnet machines, rotor dynamics, thermal stress.

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“…Interior permanent magnet (IPM) synchronous motors are widely used in various industrial applications such as automotive applications, pumps, compressors, centrifuges and many other fields [1][2][3][4]. The most important advantages of IPM over their counterparts are high power density, high efficiency, wide range and adjustable speed operation, high power factor, and low weight [2].…”

Section: Introductionmentioning

confidence: 99%

“…The interior permanent magnet (IPM) synchronous motor rotors are more mechanically robust as opposed to the surface mounted permanent magnet synchronous motors; however, the permanent magnet-based machines might be in general less mechanically robust compared to induction machines due to the fact that they contain relatively fragile mechanical components, such as permanent magnets and their protecting metal sleeves and aluminum alloy shields for eddy current reduction [2]. These components reduce the rotor stiffness, which may lead to undesirable resonance critical speeds close to the operation range, which need to be precisely calculated and foreseen during the process of the development and design of the electrical machine [2].…”

Section: Introductionmentioning

confidence: 99%

“…Such complete mechanical analysis should include both static modal analysis for vibration analysis of geometrical and material properties of the machine components and the rotor dynamics in order to investigate the vibration of the rotating parts. The modal analysis of the machines' stator has already been extensively reported for different types of electrical machines [5][6][7][8][9][10][11][12][13][14], while the rotor dynamic has mostly studied for the mechanical design of high speed machines constructed for special applications [1,2,4,[15][16][17][18][19][20][21][22][23][24][25]. To the best of the authors' knowledge, the complete mechanical analysis of the stator and rotor components of the same machine by the modal and rotor dynamic analysis has not been reported.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modal Analysis and Rotor-Dynamics of an Interior Permanent Magnet Synchronous Motor: An Experimental and Theoretical Study

Čorović¹,

Miljavec²

2020

Applied Sciences

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This paper investigates mechanical vibrations of an interior permanent magnet (IPM) synchronous electrical motor designed for a wide range of speeds by virtue of the modal and rotordynamic theory. Mechanical vibrations of the case study IPM motor components were detected and analyzed via numerical, analytical and experimental investigation. First, a finite element-based model of the stator assembly including windings was set up and validated with experimental and analytical results. Second, the influence of the presence of the motor housing on the natural frequencies of the stator and windings was investigated by virtue of numerical modal analysis. The experimental and numerical modal analyses were further carried out on the IPM rotor configuration. The results show that the natural frequencies of the IPM rotor increase due to the presence of the magnets. Finally, detailed numerical rotordynamic analysis was performed in order to investigate the most critical speeds of the IPM rotor with bearings. Based on the obtained results, the key parameters related to mechanical vibrations response phenomena, which are important when designing electrical motors with interior permanent magnets, are provided. The main findings reported here can be used for experimental and theoretical mechanical vibration analysis of other types of rotating electrical machines.

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Rotordynamics modelling and analysis of high‐speed permanent magnet electrical machine rotors

Cited by 15 publications

References 19 publications

A Modified Transfer Matrix Method for Modal Analysis of Stepped Rotor Assembly Applied in the Turbomolecular Pump

A Modified Transfer Matrix Method for Modal Analysis of Stepped Rotor Assembly Applied in the Turbomolecular Pump

Rotor Stress and Dynamics Analysis of a High-Speed Permanent Magnet Machine for a Micro Gas Turbine Considering Multiphysics Factors

Modal Analysis and Rotor-Dynamics of an Interior Permanent Magnet Synchronous Motor: An Experimental and Theoretical Study

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