The Combined Effect of Time Harmonics and Winding Discreteness on the Thrust of a Linear Induction Motor

Saleh, Malaka A.; Abu-Faddan, Hassan I.; Makky, A-R.A.M.; El-Gendi, Mohamed S.

doi:10.1080/07313568008955396

Cited by 1 publication

(3 citation statements)

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“…This can be achieved by introducing the following changes [B. J. Chalmers, 1977, A.M. Saleh, 2001: i-all reactances have a value of "n" times their value at the fundamental frequency f 1 , ii-the operating slip is the harmonic slip s n . The equivalent circuit of a solid-rotor induction motor with nonsinusoidal voltage supply appears to have the same configuration as the familiar equivalent circuit of a conventional induction motor under the same supply voltage as shown in Fig.…”

Section: Harmonic Equivalent Circuitmentioning

confidence: 99%

“…In addition to the unidirectional harmonic torques, a pulsating torque is developed due to interaction between air-gap flux and rotor current belonging to different harmonics. This pulsating torque whose frequency is the difference between the frequencies under consideration [A. M. Saleh, 2001]. For example, the pulsating torque pulsating at 6f 1 is generated when fundamental flux reacts with either fifth or seventh harmonic rotor currents.…”

Section: Torque Pulsationmentioning

confidence: 99%

“…An external reactance can be added to a low reactance machines to reduce the torque pulsation [A. M. Saleh, 2001]. However, this may effect the fundamental torque and it is applicable to small machine of low output torque.…”

Section: Torque Pulsationmentioning

confidence: 99%

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Effect of Harmonics on a Solid-Rotor Induction Motor

Saleh,

Radhi

2006

jcoeng

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The paper records a study of an investigating the performance of a solid-rotor induction motor witha rectilinear inverter excitation to identify the effects of the associated time harmonics. Theperformance is determined experimentally by using a stator of a three-phase laboratory inductionmotor that is fitted with a solid-steel rotor and compared with the theoretical model developedwhich uses the Fourier components of the supply voltage waveform. Final conclusions are drawnfrom comparing motor performances with sinusoidal and inverter excitations. An equivalent circuitmodel is developed to determine the harmonic currents. The development of the theoretical modelmake use of the results of existing field analyses. Harmonic currents and other performance detailsincluding the possible interactions between the co-existing harmonics are determined and discussed.The measured values of torque, input current and power over full speed range with the two types ofexcitation are presented, and compared with the theoretical values. The waveforms of current, phaseand line voltages are analyzed experimentally and compared with simulation results. The theoreticalresults correlate well with measured results and the significant harmonic effects are identified

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Section: Harmonic Equivalent Circuitmentioning

confidence: 99%

Section: Torque Pulsationmentioning

confidence: 99%