Experimental and Finite Element Analysis of Solid Rotor End Effects

Aho, Tuomo; Nerg, Janne; Pyrhönen, Juha

doi:10.1109/isie.2007.4374776

Cited by 18 publications

(23 citation statements)

References 4 publications

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“…Numerical methods [8], [9], [13], [21], [23]- [26], [29]- [31], [34]- [40] (finite elements in particular) are more frequently used when analysing general HSIMs. This has to do with their reliability and practicability which allows modelling from simple structures to more complex topologies.…”

Section: Electromagnetic Methods To Analyse Hsimsmentioning

confidence: 99%

“…This has to do with their reliability and practicability which allows modelling from simple structures to more complex topologies. Time-stepping numerical methods [24], [29], [34]- [37] are also used regularly to obtain better accuracy in the predictions of the motor operation and also to optimise the design, because it takes into account the nonlinear behaviour of the materials in the machine. A finer mesh usually provides more accurate results; however, this also increases the processing time.…”

Section: Electromagnetic Methods To Analyse Hsimsmentioning

confidence: 99%

“…[28] presented an approach to analyse these type of rotors. In the high-speed area, slitted SRs have been researched by a number of authors [4], [20], [21], [26], [29]- [34]. The rotor slitting improves the penetration depth of the flux density in the rotor material and has a significant impact in the rotor performance producing better torque properties, higher…”

Section: Laminated Rotor Hsimsmentioning

confidence: 99%

“…Literature Review -High-Speed Electrical Machines reasonable time [34]. For this reason, a number of approaches can be adopted when stepping-time is required.…”

Section: Chaptermentioning

confidence: 99%

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Electromagnetic modelling of high speed induction motors

Velázquez¹,

Smith²

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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Improvement in the power density of induction machines can be achieved when they operate at high rotational speeds using frequency converters that provide a higher frequency supply to the motor. Applications such as compressors require intrinsically high-speed operation. In these cases the mechanical integrity is prioritized over the electromagnetic performance and solid rotors are normally used instead of laminated rotors so they can withstand the peripheral and radial stresses caused by the high speeds. Small skin depths are associated with solid rotor structures; this complicates the electromagnetic analysis when FE modelling is used because a fine mesh is typically required. Although analytical methods in general tend to be less accurate than FE models, they can provide faster and reasonably accurate results. This thesis evaluates the use of an analytical multi-layer model as a preliminary design tool for determining the electromagnetic performance of high-speed copper-coated solid rotors. A simple FE model is developed in order to validate the results obtained from the analytical model. The input to the analytical multi-layer and FE models is normally current; consequently they are modified to work with voltage as the input reference. The multi-layer model is compared under constant current operation and constant voltage operation. The limitations of the analytical multi-layer model are highlighted. Declaration 13 Declaration No portion of the work referred to in the thesis has been submitted in support of an application for another degree or qualification of this or any other university or other institute of learning.

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Section: Electromagnetic Methods To Analyse Hsimsmentioning

confidence: 99%

Section: Electromagnetic Methods To Analyse Hsimsmentioning

confidence: 99%

Section: Laminated Rotor Hsimsmentioning

confidence: 99%

“…Literature Review -High-Speed Electrical Machines reasonable time [34]. For this reason, a number of approaches can be adopted when stepping-time is required.…”

Section: Chaptermentioning

confidence: 99%

See 2 more Smart Citations

Electromagnetic modelling of high speed induction motors

Velázquez¹,

Smith²

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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“…In order to reduce the machine losses and increase the machine efficiency, the rotor magnetic core is usually realized with a laminated sheets. However, there are some applications in which the solid rotor structure is required to increase the mechanical strength, such as in high speed machines [17] or in transportation applications for good starting performance [18]. In literature, several papers presents analytical models to evaluate the rotor eddy-current losses in PM machines [5], [9] [11], [15], [19]- [22].…”

Section: Introductionmentioning

confidence: 99%

Impact of the rotor back-iron resistivity on the rotor eddy-current losses in fractional-slot concentrated windings PM machines

Cavagnino

Lazzari

Miotto

et al. 2011

2011 IEEE Energy Conversion Congress and Exposition

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It is well known that in fractional-slot concentrated windings the eddy-current losses in the permanent magnets can be relevant and, for this reason, they must be evaluated in the machine design procedure. The paper investigates the influence of the rotor back-iron resistivity on the rotor eddy-current losses in this machine typology. In particular, a external rotor annulus shape PM machine with fractional-slot non-overlapping concentrated windings is considered. The machine is a scaled representative prototype of starters/generators embedded in aircraft engines. Both the rotor back-iron and permanent magnet eddy-currents are simultaneously considered by means of bidimensional transient FEM simulations, including effects of stator slotting, rotor motion and material saturation. The analysis is conducted increasing the rotor back-iron resistivity from an ideal situation of a high-conducting material up to the opposite ideal condition of a non-conducting material. Adjusting the rotor backiron resistivity, the space MMF harmonic components influence on the machine torque is qualitatively investigated and discussed too.

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High‐speed solid rotor induction motor design with improved efficiency and decreased harmonic effect

Gülbahçe

Kocabaş

2018

IET Electric Power Applications

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Depending on its mechanical and thermal advantages, solid rotor induction motors (SRIMs) are widely used in demanding high-speed applications. Since eddy currents are set free in SRIMs, great part of rotor losses is caused by space harmonics created in the air-gap. Rotor losses are increased tremendously in high-speed applications with the remarkable increase in driving frequency. Here, an innovative design representing a novel stator and rotor combination that is not achieved in previous studies is proposed by structural changes to stator to eliminate major effective space harmonics. An unconventional stator slotting pattern and winding distribution is calculated by nature-inspired numerical optimisation techniques while keeping the fundamental winding factor relatively high. An example design where novel concepts are implemented is presented and a comparison is given in terms of important operational quantities with that of a standard SRIM.

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Experimental and Finite Element Analysis of Solid Rotor End Effects

Cited by 18 publications

References 4 publications

Electromagnetic modelling of high speed induction motors

Electromagnetic modelling of high speed induction motors

Impact of the rotor back-iron resistivity on the rotor eddy-current losses in fractional-slot concentrated windings PM machines

High‐speed solid rotor induction motor design with improved efficiency and decreased harmonic effect

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