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Power optimization of an electric propulsion system based on variable speed rotor blades
Renfang Huang +3 more
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Electric powertrain for helicopter tail rotor
2016 6th International Electric Drives Production Conference (EDPC), 2016The design of multi-phase permanent magnet brushless motor for an electrical helicopter tail rotor is introduced and described. The presented electric machine allows a substitution of the actual mechanisms in tail rotor system matching envelope, weights and performances. In order to obtain high torque with small overall dimensions of the motor, a spoke-
Castellini, Luca +2 more
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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
B.H. Smith, D. Platt
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Exact solutions of the rigid rotor in the electric field
International Journal of Quantum Chemistry, 2020AbstractWe first present a new constraint condition on the confluent Heun functionHC(α,β,γ,δ,η;z) (β,γ ≥ 0,z∈ [0, 1]) and then illustrate how to solve the rigid rotor in the electric field. We find its exact solutions unsolved previously through solving the Wronskian determinant.
Chang‐Yuan Chen +4 more
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Understanding rotor balance for electric motors
Conference Record of 2014 Annual Pulp and Paper Industry Technical Conference, 2014A balanced rotor is essential for smooth operation of rotating equipment. There are many factors that can cause unbalance in rotating machineries. This paper discusses some common causes of unbalance, different balancing methods and how they apply to rigid and flexible rotors, the difference and the relationship between balancing grades, vibration as a
Walt Herbert, Papa Diouf
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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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Life-Time-Assessment for Rotors for Electric Drives [PDF]
2018 Third International Conference on Engineering Science and Innovative Technology (ESIT), 2018 The rotors of electric motors for vehicle drives are subject to time-varying loads in customer use due to mechanical, magnetic, electrical and thermal forces. To ensure the operational safety of the electric motor throughout the design life, a computational or experimental life-time assessment has to be performed.
Peter Haefele, Markus Thum, Timo Knerr
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ELECTRIC TUBULAR MOTOR WITH COMPOSITE ROTOR
Electric Machines & Power Systems, 1979Abstract An analytical and experimental investigation is presented for electric tubular induction motor having a rotor consisting of alternate rings of copper and steel mounted on a solid-steel core. A one dimensional-field analysis is carried out to study the effect of the different rotor parameters on the thrust.
Azza A. Fahim +3 more
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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.
Ioan Calin Rosca +2 more
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Phenomenon Rotor Fault-Multiple Electrical Rotor Asymmetries in Induction Machines
IEEE Transactions on Power Electronics, 2009In the literature the effects caused by a single or several adjacently broken rotor bars, or a broken end ring are thoroughly investigated. The phenomenon of various non-adjacently broken rotor bars has not been studied, so far. Since non-adjacently broken rotor bars may give rise to fault signatures which are not directly related with the fault extent,
Anton Haumer +4 more
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