Very-high-speed permanent magnet motors: Mechanical rotor stresses analytical model

Burnand, Guillaume; Araujo, Douglas Martins; Perriard, Yves

doi:10.1109/iemdc.2017.8002066

Cited by 26 publications

(15 citation statements)

References 11 publications

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“…[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]. The PM rotors are usually modeled as the multifaceted cylinders in most analytical techniques.…”

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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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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“…The enclosure is mounted with an interference, inducing a compressive stress on the magnet. The equations to compute the mechanical stresses in the rotor can be found in [27]. For the following optimization, the chosen material for the enclosure is titanium grade 5, the magnet is NdFeB and the shaft is stainless steel.…”

Section: G Rotor Mechanical Strengthmentioning

confidence: 99%

Very-High-Speed Miniaturized Permanent Magnet Motors: Design and Optimization

Burnand

Perriard

2019

2019 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper aims to present an optimization method for very-high-speed electrical machines based on multiphysical analytical models. Analytical models allow a fast design but have to be robust and reliable. The set of models presented is very complete and covers the mechanical design of the rotor, the computation of the losses and the computation of the back EMF and torque constants. All the models have been validated on a 400 krpm prototype, which is, to the authors' knowledge, one of the smallest and fastest electrical motor ever operated. Several optimization scenarios are presented and analyzed to get the best performance of very-high-speed machines. Index Terms-Very-high-speed motor, synchronous motor, miniaturized motor, permanent magnet, losses modeling, heuristic optimization.

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“…For the second load case it is important to account for the change in interference due to rotation [13].…”

Section: Plane Stress Approachmentioning

confidence: 99%

“…The analysis methodology is otherwise identical to that for the plane stress case with stresses due to interference and rotation being found individually and then summed. Again, as [13] observe, it is important to account for the change in interference when analyzing the combined rotation and interference load case. The impact of this can be seen in Figure 7 for a cylinder pair with the properties given in Table 1 and an initial interference of 0.03 mm.…”

Section: Plane Strain Approachmentioning

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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Very-high-speed permanent magnet motors: Mechanical rotor stresses analytical model

Cited by 26 publications

References 11 publications

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

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

Very-High-Speed Miniaturized Permanent Magnet Motors: Design and Optimization

Mechanical Design of Rotors with Surface Mounted Permanent Magnets

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