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This paper deals with a finite-element method based design of a liquid-rheostat reduced-voltage starter for three phase squirrel-cage induction motors which typically drive irrigation pump loads.
This paper presents an initial study to provide further insight on the conditions under which a natural bar breakage was reproduced experimentally. With this aim several magnitudes at a rotor bar's narrowing (hot spot) in an induction motor during heavy transients: long startup and plug stopping, are calculated in order to compare it with the experimental data, which suggested that the bar breakage...
This paper presents a high-frequency (HF) model and the parameter identification of electrical machines in hybrid or electric vehicles. For improved results, the winding design in the finite element analysis (FEA) considers individual wires and parallel wire strands. A linear approximation of the BH characteristic of the iron sheets is carried out for the determination of the frequency dependent self...
This paper proposes a method of finite elements analysis (FEA) of the rotor cage induction motor. In case of an induction motor supplied with constant voltage, the current during starting process is not constant. For that reason, FEA in frequency domain at constant current is not appropriate for direct start simulation. A motion analysis is required, the rotor speed being computed according to magnetic...
This paper deals with deep bar effect in squirrel cage rotors. Induction machines using this type of rotor are widespread. Some cages enhance the deep bar effect to improve the starting performances. In cited references, the analytical calculation of the equivalent circuit parameters has only been investigated for single-cage and double-cage rotors. In this paper, an analytical model is developed...
In this paper, the current in the end ring of a submersible motor is studied by finite-element method. Since the resistance and the electromagnetic force of end ring are related to its current, it is essential to study the current distributed characteristics in detail. Based on the Maxwell's equations and equivalent circuits, the final current density in the end ring is calculated. Then, the characteristics...
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...
This paper will describe how finite element analysis can be utilize to design and model the performance of rotary electrical machines. Special interest placed on the induction motor since the design is simple, and has greatest influence in operation of electrical power system. Transient AC analysis has been studied as it is necessary to examine the motor's performance dynamically. Opera 2D software...
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 realization of a vector control for the operation of induction motors often takes advantage of ordinary equivalent circuit models. Some simplified models are consisting of a reduced number of system parameters and allow a very basically identification procedure by no-load tests in the lab. Fictive identification tests could fortunately be carried out by the finite element method during the development...
A method for calculating the performance of double-sided linear induction motor (DLIM) with short secondary is presented in this paper. The analytical solution of air gap flux density is firstly deduced from one-dimensional (1-D) electromagnetic field equations, then in the equivalent circuit of the motor, to take both longitudinal and transverse end effects into account, the correction coefficients...
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...
The skin effect of rotor current is one of key factors which affect the simulation accuracy of three-phase induction motors with deep rotor bars. This paper proposes an improved dynamic model considering the skin effect of three-phase induction motors at arbitrary operation, from the starting to rated-load operation. The simulation results using the proposed model are compared with those from the...
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