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

Zheng, Ming; Huang, Wenhao; Gao, Chuang

doi:10.1109/access.2020.3017788

Cited by 12 publications

(5 citation statements)

References 28 publications

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“…It was found that the error caused in the natural frequencies by neglecting the thermal expansion effect can be 4%. M. Zheng et al analysed the thermal expansion effect on the natural frequencies of a micro gas turbine rotor system with a surface mounted permanent magnet machine [16]. The carbon fibre wrapping direction impact was considered in the thermal stress analysis.…”

Section: A Load Modelling In Rotating Electrical Machinesmentioning

confidence: 99%

See 1 more Smart Citation

A Manufacturing Driven Design Methodology to Lightweighting of the Structural Elements of a Permanent Magnet Electrical Machine Rotor

et al. 2022

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It is common practice for electrical machines to be designed with a focus predominantly on the electromagnetic performance. The mechanical design is then subsequently undertaken to meet various mechanical performance criteria, with this finalised design then passed on for manufacture. In many cases, the manufacturing constraints have not been taken fully into consideration during the electromagnetic or more particularly the mechanical design and hence some changes are required to the design to make it manufacturable. This in turn can lead to a non-optimal machine being manufactured. If manufacturing constraints and opportunities are regarded as key quantitative inputs to the design process, not only can these post-design changes be minimised, but benefits of the manufacturing process can be exploited to produce a superior product. This paper proposes a methodology to fully integrate the mechanical design and manufacturing process routes into electrical machine design and illustrates its utility within the context of light-weighting of a permanent magnet rotor for an aerospace electrical machine. Within the proposed methodology, several alternative configurations of the rotor are considered with applicable manufacturing routes identified at the initial stages of design and an analytical design procedure to fulfil the application and performance criteria is developed. Different manufacturing materials and constraints as well as the impact of manufacturing process are identified to be embedded into the design procedures. Finally, the paper demonstrates an application of this methodology together with a discussion of the features which offer promise in achieving economically lighter weight design through integration of manufacturing into the design procedure.

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Section: A Load Modelling In Rotating Electrical Machinesmentioning

confidence: 99%

“…Some more specific results are also notable such as use of cast aluminium which doesn't seem to be an appropriate choice due to degradation of mechanical properties. (16). Note that the stiffness of 3.61e07 N/m is adopted for the three design options.…”

Section: Case Studymentioning

confidence: 99%

A Manufacturing Driven Design Methodology to Lightweighting of the Structural Elements of a Permanent Magnet Electrical Machine Rotor

et al. 2022

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“…Stress computation techniques are categorized into finite element and analytical analysis. [22], [23] use the finite element method, while numerous other research articles proposed an analytical computation model [24]- [29]. [24] suggested a simplified analytical approach based on the premise that the rotor is severely rotational symmetry.…”

Section: Figure 1 Proposed Rotor Topologymentioning

confidence: 99%

“…[22], [23] use the finite element method, while numerous other research articles proposed an analytical computation model [24]- [29]. [24] suggested a simplified analytical approach based on the premise that the rotor is severely rotational symmetry. The displacement technique was proposed for the computation of a high-speed PM machine with a non-magnetic alloy enclosure [25] and [26].…”

Section: Figure 1 Proposed Rotor Topologymentioning

confidence: 99%

Design and Performance Investigation of 3-Slot/2-Pole High Speed Permanent Magnet Machine

Khan

et al. 2021

IEEE Access

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High-speed rotating mechanical machinery is a developed, mature and reliable technology for many engineering applications. In high-speed permanent magnet machines, the rotor's permanent magnet PM is not strong enough to withstand the centrifugal force resulting from excessive rotational speed; thus, the PM material must be protected by a non-magnetic alloy sleeve. This paper presents a novel high-speed PM machine with solid rotor PM covered by a titanium retaining sleeve. The rotor stress condition is simplified as a plane stress problem according to the strength measurement of solid PM rotors in the high-speed PM motors. The analytical formulas for rotor stress are presented based on the polar coordinate displacement method. The proposed model is compared with a conventional model having auxiliary slots in stator teeth. Using a finite element analysis environment, the performance analysis shows that the proposed design has reduced magnet eddy current loss, cogging torque, and iron losses. The initial design is also optimized using a deterministic optimization algorithm that increases output torque by 26% compared to the initial design. INDEX TERMS Airgap flux density, finite element method, high-speed permanent magnet machine, magnet eddy current loss, retaining sleeve, rotor design, stress analysis.

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“…The heating condition of an ordinary motor may be relatively low, but the heating condition of a high-speed motor is serious due to the higher speed and greater power. The temperature has a great impact on the stability of a high-speed motor [18][19][20]. It is valuable to focus on the relationship between temperature and rotor strength of a high-speed motor.…”

Section: Introductionmentioning

confidence: 99%

Influence of Interference Fit and Temperature on High-Speed Permanent Magnet Motor

Zeng,

Yang,

Yang

et al. 2023

Applied Sciences

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A high-speed permanent magnet motor is the core driving component of a centrifugal air compressor. The power of the centrifugal air compressor is output by the motor. Its safety and reliability are embodied in the stability of the rotor structure, which greatly affects the stability and working efficiency of the centrifugal air compressor. Much research has focused on the material strength, structural characteristics, and fit clearance of a high-speed rotor, whereas few research articles have focused on the influence of interference fit of high-speed and ultra-high-speed permanent magnet motors, and there is also little research on the thermal failure caused by temperature in high-speed motors. In this paper, the influence of the interference fit and temperature of the high-speed permanent magnet motor is studied. Using finite element analysis conducted by Ansys to obtain simulation data, the influencing factors of the strength of the interference are analyzed comprehensively in the centrifugal compressor rotor system. The interference value and rotational speed range are determined via numerical calculation. Under the condition of minimum interference, when the calculated speed reaches 137,628.82 rpm, the structure of the rotor is loose and fails, which is a mechanical failure caused by the relative sliding of the magnet and the sheath. The calculated speed value differs from the simulation result by about 1.2%. The simulation results show that the maximum stress of the structure can be reduced from 1186.1 MPa to 308.42 MPa by adding chamfer to the end covers in interference fit structure. The effects of interference value, rotational speed, temperature, and sheath thickness on the structure are also analyzed. From the perspective of temperature on structural reliability, the failure temperature of the structure decreases when the interference value increases. The lowest failure temperature is 182.3 °C when the interference value is 70 μm. After that, the interference value increases and the failure temperature increases. The reason for this is the interaction between radial stress and contact stress. These results are caused by the interaction between interference fit and temperature, which should be paid attention to when the structure of a high-speed permanent magnet motor is designed.

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

Cited by 12 publications

References 28 publications

A Manufacturing Driven Design Methodology to Lightweighting of the Structural Elements of a Permanent Magnet Electrical Machine Rotor

A Manufacturing Driven Design Methodology to Lightweighting of the Structural Elements of a Permanent Magnet Electrical Machine Rotor

Design and Performance Investigation of 3-Slot/2-Pole High Speed Permanent Magnet Machine

Influence of Interference Fit and Temperature on High-Speed Permanent Magnet Motor

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