Results 301 to 310 of about 116,465 (358)
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Rotor Optimization to Reduce Electric Motor Noise
SAE International Journal of Advances and Current Practices in Mobility, 2023<div class="section abstract"><div class="htmlview paragraph">Electric motor is among the main sources of noise and vibration for electrified propulsion systems. This paper focuses on the electric motor rotor NVH optimization, which is identified as a key enabler to reduce the motor whine, and balances other performance such as motor torque
Song He +3 more
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Internal rotor airgap-less electric motors
2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017This paper proposes a new family of electric motors based on the concept of an airgap-less device with an internal rotor. The internal flux and therefore electromagnetic torque is maximized because the rotor is allowed to touch the stator. The proposed family of motors are competitive in applications where hydraulic motors are prevalent, i.e., low ...
Omar Nezamuddin +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
Papa Diouf, Walt Herbert
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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.
MAHMOUD A. SALEH +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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Electrical Rotors in the Heart
1991Electrophysiological processes in the heart are responsible for impulse formation and conduction. The normal action of these processes is necessary for the production of an efficient contraction. Interruption of impulse formation or conduction [3, 18] by either biological, pathological, or toxicological mechanisms can cause a disruption of the normal ...
P. A. Guse +4 more
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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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