Results 261 to 270 of about 116,656 (313)
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PERFORMANCE OF ELECTRIC MEDIUM-SIZED VARIABLE-RPM ROTOR AND SHROUDED ROTOR
2022Electric variable RPM rotors are increasingly being used for propulsion and control of unmanned air vehicles. As these vehicles scale to carry heavier payloads of 50 to 400 lbs (20 to 180 kgs) in the group 2 and 3 UAS category, there are concerns about their aerodynamic performance and handling quality degradation. Therefore, there is a need to develop
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Twin rotor drive for an electric vehicle
IEE Proceedings B Electric Power Applications, 1993An original electric machine is described which has a single stator and two rotors, each core being of a disc geometry, with the stator sandwiched between the two rotors. The rotors carry squirrel cage windings, and are mounted on individual, independent shafts driving two wheels of an electric vehicle. The torque generated by each rotor depends on the
D. Platt, B.H. Smith
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Modal test of an electrical machine rotor
2010 12th International Conference on Optimization of Electrical and Electronic Equipment, 2010The aim of this paper is to present an experimental procedure used to determine the fundamental natural frequency and the damping ratio of an electrical machine rotor. There are described both the experimental set-up and the damping ratio calculation, using classical methods of modal testing.
M. Filip, I.C. Rosca, E. Helerea
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Balancing flexible rotors of large electrical machines
2010 Record of Conference Papers Industry Applications Society 57th Annual Petroleum and Chemical Industry Conference (PCIC), 2010This paper describes how rotors of large electrical machines with bending modes within the speed range can be balanced. A method is described, that allows for high speed balancing in a safe environment (a balancing facility) and avoids correctional balancing in the complete machine setup.
Martin Regener, Lutz Huebner
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Airgapless Electric Motors With an External Rotor
IEEE Transactions on Industrial Electronics, 2018This paper proposes a new family of electric motors based on the concept of an airgapless device. In this type of device, the rotor is allowed to touch the stator at a contact point, which maximizes the internal flux and, therefore, the electromagnetic torque. A higher torque density motor is proposed in this paper due to a reduced reluctance caused by
Maryam Alibeik +4 more
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The rotor bearings of electricity meters
Journal of the Institution of Electrical Engineers, 1929In this paper an accumulation of experimental and statistical data which have been obtained by the author has been brought under review for the purpose of discussing the leading problem in the sphere of meter maintenance, namely that of worn bearings.Attention is drawn to the necessity for improving the reliability of meters in service in consequence ...
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Electric generator using a triangular diamagnetic levitating rotor system
Review of Scientific Instruments, 2009This paper describes a feasibility study of creating a small low friction and low maintenance generator using a diamagnetically stabilized levitating rotor. The planar rotor described in this paper uses a triangular configuration of magnets that generates emf by passing over coils placed below the rotor.
Joe Nhut, Ho, Wei-Chih, Wang
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Finite-Element Analysis for a Rolling-Rotor Electrical Machine
IEEE Transactions on Magnetics, 2010A method for finite-element analysis of a rolling-rotor electrical machine was developed. The conventional moving-band technique for modeling motion was replaced by an element structure of radial bands in the air gap. This finite-element scheme allows a large distortion of the elements at the contact point of stator and rotor without suffering of ...
Biernat, Adam +7 more
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2009 IEEE Power & Energy Society General Meeting, 2009
In this paper, decoupled control of rotor torque and rotor electric power in a reluctance wound rotor brushless doubly fed machine, (BDFM), is presented. The machine stator windings are fed from two separate voltage source inverters. The proposed control technique is applied to the inverters such that the BDFM is capable of producing mechanical torque ...
A. S. Abdel-Khalik +4 more
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In this paper, decoupled control of rotor torque and rotor electric power in a reluctance wound rotor brushless doubly fed machine, (BDFM), is presented. The machine stator windings are fed from two separate voltage source inverters. The proposed control technique is applied to the inverters such that the BDFM is capable of producing mechanical torque ...
A. S. Abdel-Khalik +4 more
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8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016), 2016
This paper investigates the torque and vibration signal spectra of wound rotor induction machines when subjected to different levels of rotor electrical unbalance. A harmonic machine model numerical study is first performed to identify the electromagnetic torque signal spectral components related to operation without or with electrical unbalance.
D.S. Vilchis-Rodriguez +5 more
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This paper investigates the torque and vibration signal spectra of wound rotor induction machines when subjected to different levels of rotor electrical unbalance. A harmonic machine model numerical study is first performed to identify the electromagnetic torque signal spectral components related to operation without or with electrical unbalance.
D.S. Vilchis-Rodriguez +5 more
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