Novel rotor design for high-speed solid rotor induction machines

McGuiness, Daniel; Gülbahçe, Mehmet Onur; Kocabaş, Derya Ahmet

doi:10.1109/eleco.2015.7394607

Cited by 9 publications

(12 citation statements)

References 12 publications

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“…The Gibbs's rotor end factor K Gibbs is taken as basis, which is more accurate for smooth solid rotor mentioned in section IV. By modifying the equivalent pole pitch according to (10), (12) and (13), the end factor of slitted solid rotor shown in (15) will increase with the slip rather than remain constant as in (4). Good agreement with the measured results is found later in this paper by the following slitted rotor's end factor K slit .…”

Section: B Under Small Slip Conditionsupporting

confidence: 76%

“…The depth and width of rotor slit is 10 mm and 2 mm, respectively. For the slitted solid rotor, the proposed end factors of slitted solid rotor in (15) are noted as K 36slits and K 72slits , respectively. Together with the other five smooth rotor's end factors, the end factors are compared in Fig.…”

Section: B Induction Motors With Slitted Solid Rotormentioning

confidence: 99%

“…There are some rotor end factors described in literatures [5][6][7][8][9]. In the 2-D FEA model, several literatures multiplied the rotor resistivity linearly by the rotor end factor to consider the end effect of rotor [2]- [4], [10][11][12][13][14][15][16][17]. However, the definition and the usage of rotor end factor should be explicit, which will be discussed in this paper.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rotor end factors for 2-D FEA of induction motors with smooth or slitted solid rotor

Wang

Huang

Sun

et al. 2017

Trans. Electr. Mach. Syst.

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Modifying the equivalent rotor resistivity with rotor end factor in 2-dimension (2-D) finite element analysis (FEA) is an effective way to analyze the 3-dimension (3-D) solid rotor problems. For the smooth solid rotor, five different rotor end factors are discussed and compared with each other. It is theoretically clarified that the resistivity of rotor in 2-D FEA should be multiplied by the square of rotor end factors to take the 3-D end effect of solid rotor into account. For the slitted solid rotor, an improved rotor end factor is proposed based on the equivalent area algorithm of eddy currents in rotor, since the end factors of smooth solid rotor are not applicable. Finally, the timeharmonic finite element method (FEM) combined with the rotor end factor is applied to analyze the performance of solid rotor induction motor. The tested and computed results are in good agreement, which proves the effectiveness of rotor end factor for the simplication of 3-D solid rotor problems.

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Section: B Under Small Slip Conditionsupporting

confidence: 76%

Section: B Induction Motors With Slitted Solid Rotormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rotor end factors for 2-D FEA of induction motors with smooth or slitted solid rotor

Wang

Huang

Sun

et al. 2017

Trans. Electr. Mach. Syst.

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“…Several methods are applied to refine the drawbacks of SRIM which are installing end rings on both ends of rotor, opening axial slits on rotor surface, or coating the rotor surface with a highly conductive material [2,[5][6][7][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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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“…Since CRIM and smooth SRIM were shown to be the worst for high-speed operations [18], only performance results of AS-SRIM, CC-SRIM and SAS-SRIM with end-rings are compared. lower efficiency is its higher rotor impedance, higher reluctance of solid steel than that of a laminated steel, higher eddy currents and greater adverse effects of harmonics [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Shielded axially slitted solid rotor design for high‐speed solid rotor induction motors

Gülbahçe

McGuiness²,

Kocabaş

2018

IET Electric Power Applications

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With its simple construction, excellent mechanical and thermal capabilities to withstand stress, solid rotor induction motors (SRIMs) have become widely used in the areas of high-speed and high-pressure application fields. In this study, a novel solid rotor structure with slits in axial directions, of which the top of the rotor iron teeth is coated with copper, is presented. The design of the novel construction is discussed in detail and all rotor geometrical design parameters are optimised. The performance of the novel rotor design is compared with that of equivalent axial-slit and copper-coated solid rotors. To determine the performances, the systems were simulated by two-dimensional time stepping finite-element analysis. In the novel structure, the fundamental flux can penetrate much deeper than that of a smooth-type induction motor because of the presence of slits. In addition, because of the existence of coating on the top of the teeth, the rotor creates decreased torque ripple resulting in less vibration. The novel rotor design provides a better efficiency with less rotor loss together with a disadvantage of decreased power factor.

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Novel rotor design for high-speed solid rotor induction machines

Cited by 9 publications

References 12 publications

Rotor end factors for 2-D FEA of induction motors with smooth or slitted solid rotor

Rotor end factors for 2-D FEA of induction motors with smooth or slitted solid rotor

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

Shielded axially slitted solid rotor design for high‐speed solid rotor induction motors

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