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The circuit parameters involving the stray load loss and harmonic torques of high speed induction motors driven by inverters are determined by both finite element analysis and experiments. In the analysis, the parameters are directly determined from the electromagnetic field distribution of the motors under load conditions. On the other hand, in the experiment, the parameters are determined from no-load,...
Rotary machines have limitations at linear moving systems. So linear motors make good used of linear actuator. The purpose of this paper is concerned with the characteristic analysis to thickness of secondary conductor in TLIM using axisymmetric model. Characteristic equations of TLIM are obtained from voltage equation. Using finite element method (FEM), parameters of voltage equation are calculated...
A novel equivalent circuit of induction motors is investigated by the finite element method in order to take into account the effects of stray load loss and harmonic torques. The characteristics of the motor obtained by the proposed and conventional circuits are compared to the measured results in order to confirm the validity and usefulness of the proposed circuit. It is revealed that the result...
In this paper, the core loss effect of silicon sheet is studied in three phase induction motor. In induction motor, the core loss is affect core loss resistance in equivalent circuit which is connected parallel to excitation inductance. The loss resistance is changed by the loss of material. The effect of three varieties of steel materials on core loss resistance and rated current has been investigated.
The aim of this paper is to analyze the positional variation of starting torque in a 3-phase induction motor. This can depend on different factors: manufacture of the rotor (fabricated or cast), skewing of the rotor bars, broken bars (and position of the break), rotor eccentricities, and other possible asymmetries. In the study, different rotors are experimentally tested and a hybrid analytical/finite...
This paper presents the analysis of single-sided linear induction motors (SLIMs) for the application in various systems demanding direct linear motion. In order to investigate the characteristics of linear induction motor according to secondary conductor structures, five types of secondary slot shape usually used in rotary motors, were set and the equivalent circuit of SLIM is proposed and the equivalent...
The paper deals with the experimental validations of the corrective coefficient used to take into account the skin effect in the equivalent circuit rotor resistance of induction motors with squirrel cages. Locked rotor tests have been performed at several supply frequencies on different induction motors; the collected experimental data have been used to validate the rotor parameters analytical estimation...
A new approach employing the circuit analysis theory instead of electromagnetic field theory is presented to calculate the rotor resistances and inductances of single-phase induction motors. The resistance and inductance parameters are obtained at positive sequence and negative sequence frequencies, respectively, with skin effect consideration. The rotor bar is divided into many thin-layers with their...
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