Optimal Angle Combination for Improving Electromagnetic Torque in Induction Motor With Double-Skewed Rotor

Xu, Wei; Bao, Xiaohua; Di, Chong; Wang, Lang; Chen, Yuanyang

doi:10.1109/tmag.2017.2707239

Cited by 8 publications

(10 citation statements)

References 11 publications

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“…Although many empirical rules have been established for correctly carrying out the skewing of stator and rotor, as to limit the maximum audible magnetic noise level radiated from the WHM-PMSM, none of these empirical rules have considered the stator's natural frequencies or variable-speed-analysis. The literature contains papers which have been recently published using empirical-based approaches to choose skewing angle [20][21][22][23][24][25] and numerical-based studies to minimize vibration and noise [21,26] without considering the natural frequencies, as well as variable-speed analysis in some cases. This study demonstrates how these important considerations can change the choice of skewing angle.…”

Section: Research Gap and Original Contributionsmentioning

confidence: 99%

Magnetic Noise Reduction of In-Wheel Permanent Magnet Synchronous Motors for Light-Duty Electric Vehicles

2020

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This paper presents study of a multi-slice subdomain model (MS-SDM) for persistent low-frequency sound, in a wheel hub-mounted permanent magnet synchronous motor (WHM-PMSM) with a fractional-slot non-overlapping concentrated winding for a light-duty, fully electric vehicle applications. While this type of winding provides numerous potential benefits, it has also the largest magnetomotive force (MMF) distortion factor, which leads to the electro-vibro-acoustics production, unless additional machine design considerations are carried out. To minimize the magnetic noise level radiated by the PMSM, a skewing technique is targeted with consideration of the natural frequencies under a variable-speed-range analysis. To ensure the impact of the minimization technique used, magnetic force harmonics, along with acoustic sonograms, is computed by MS-SDM and verified by 3D finite element analysis. On the basis of the studied models, we derived and experimentally verified the optimized model with 5 dBA reduction in A-weighted sound power level by due to the choice of skew angle. In addition, we investigated whether or not the skewing slice number can be of importance on the vibro-acoustic objectives in the studied WHM-PMSM.

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Section: Research Gap and Original Contributionsmentioning

confidence: 99%

Magnetic Noise Reduction of In-Wheel Permanent Magnet Synchronous Motors for Light-Duty Electric Vehicles

2020

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“…Regardless of the skewing effect, the expressions of stator and rotor magnetic flux densities are similar to each other. Relative to the corresponding coordinate systems, the stator and rotor harmonic magnetic flux densities in straight-slot induction motor are expressed respectively as [6] (1) (2) where B νb and B µa are separately the amplitudes of stator and rotor harmonic flux densities, φ νb and φ µa are the initial phase angles of corresponding harmonics, ω 1 is the angular frequency of power supply and ω r is the electrical angular velocity of rotor.…”

Section: Slot Harmonic Magnetic Fieldmentioning

confidence: 99%

“…The corresponding ν a th stator spatial harmonic is changed with an electrical angle Δθ r ν a . Thus, the phase difference and time difference could be related as (5) By substituting equation (5) into equation (2), the rotor spatial harmonic magnetic field at the moment of Δt+t could be simplified as (6) The period of rotor spatial harmonic T r = 2π/(Z 2 k 2a ) could be attained by comparing equations (2) with (6). Obviously, the least common multiple of the period of rotor harmonic is equal to one rotor slot pitch t 2 .…”

Section: Slot Harmonic Magnetic Fieldmentioning

confidence: 99%

“…As the skewed angle should not be bigger than necessary, there exists an optimal value for certain performance of the machine [5]. This principle also fits to the dual skewed cage rotor induction motor in which the decreased skewed angle is relevant to a higher fundamental torque [6].…”

Section: Introductionmentioning

confidence: 99%

“…The value of skewed angle is gradually decreased from the 1.0 rotor slot pitch which is always considered as a routine skewed angle [1]. Although different angle combinations could result in the identical skewing effect [6], the stagger angle here is constantly equal to half a rotor slot pitch for the rapidity of calculation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Dual Skewed Rotor in Cage Induction Motor for Reducing Synchronous Parasitic Torque

Xu¹,

Bao²,

Xu³

et al. 2019

JMAG

Self Cite

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Dual skewed rotor is an improved skewed rotor pattern in suppressing the slot harmonics. However, in order to lessen synchronous parasitic torque, the relevant structural parameters should be modified for different slot combinations. According to the unified expressions of magnetic flux densities, the general harmonic torque could be calculated with the virtual displacement method. Then, the synchronous torque ratio is proposed to reflect the effect of synchronous parasitic torque on the starting torque. Under the premise of the assumed parameter range, the rotor type and minimized skewed angle are determined for three kinds of slot combinations. The normal skewed rotor could be seen as a special topology of dual skewed rotor. Finally, the validity of designing process is verified by the comparison of simulation study and experimental results.

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Rotor eddy current analysis and optimisation design of intermediate ring in novel double squirrel‐cage induction motor

Bao

Cheng

et al. 2020

IET Electric Power Applications

Self Cite

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The intermediate ring (IR) in the novel squirrel-cage rotor is vulnerable to electrical faults for its relatively small dimension. With the investigation of IR current features, this study mainly proposes an optimisation design strategy of IR to avoid excessive thermal stress at a start-up instant. The amplitude and phase relations of various rotor currents are reflected in the proposed current phasor diagram. In terms of the internal distribution of one concrete current, the circuit analysis theory is applied by dividing the whole conductor into multiple subconductors. The leakage flux around the conductors is simplified, respectively, according to the spatial symmetry. With reference to the existing bar design, the IR design scheme is mainly guided by two essential principles regarding the current-related parameters. Finally, the validity of the designing process of IR is verified by the coupled simulations and temperature-rise experiments. The surface temperature of the designed IR is not the highest, and the partial temperature difference is limited and reasonable.

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Optimal Angle Combination for Improving Electromagnetic Torque in Induction Motor With Double-Skewed Rotor

Cited by 8 publications

References 11 publications

Magnetic Noise Reduction of In-Wheel Permanent Magnet Synchronous Motors for Light-Duty Electric Vehicles

Magnetic Noise Reduction of In-Wheel Permanent Magnet Synchronous Motors for Light-Duty Electric Vehicles

Design of Dual Skewed Rotor in Cage Induction Motor for Reducing Synchronous Parasitic Torque

Rotor eddy current analysis and optimisation design of intermediate ring in novel double squirrel‐cage induction motor

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