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• W1497325486 abstract "Traditional design/prototype/test cycles have improved the efficiencies of small induction motors to high levels. To achieve still higher efficiencies, motor performance must be studied in a more detailed and integrated manner. The authors present a nonlinear, time-dependent computer simulaton modeling the performance of a permanent-splitcapacitor induction motor. The effects of nonlinear permeability and time varying terminal voltages are included in the model. Two-dimensional finite element magnetic field equations are coupled with the electri~: circuit equations and solved using the Newton-Raphson and Crank-Nicholson methods. The simulation predicts main and aWJ;iliary winding cur· rents, induced rotor currents, hysteresis losses and motor torque as functions of time. Due to the detailed nature of the results a deeper understanding of motor perfonnance factors, normally difficult to determine, can be obtained. INTRODUCTION Induction motor design involves the prediction and evaluation of performance parameters such as torque, line current and losses at any given slip and tenninal conditions. These parameters can be accurately determined only with knowledge of the magnetic field distribution within the machine. Approximate analytical methods [I] have been used in the past with some success. Continued pressure to conserve energy dictates improved motor performance. This requires an even more detailed knowledge of the magnetic fields occurring within motors. Two-dimensional statioruu:y magnetic field problems have been investigated by many authors [2,3]. The nonlinear penneability or saturation characteristics of steel require iterative methods for the solution of these problems. Tandon, Armor and Chari [4] were first to combine the Newton· Rapbson technique with the CrankNicholson central difference scheme to solve transient field problems in electrical machines. The disadvantage of these methods is that they rely on apriori knowledge of the c~ts or current densities in the device. The problem is much more complicated when current densities are unknown and terminal conditions must be considered. Potter and Cambrell [S] combined a twe>dimensional finite element field solution and circuit equations to simulate an indu~:tion motor. In their work the stator field was rq>laced with a current sbeet at slip ftequency. Strangas and Theis [6] also combined the finite element field solution with circuit equations to model a shaded-pole motor. Their approach used a time-dependent grid for rotor movement. This paper expands the above techniques to model a pennanent-splitA capacitor induction motor. The two-dimensional magnetic field equations are combined with electric circuit equations describing end and elCtemal effects. The partial derivatives" @default.
• W1497325486 created "2016-06-24" @default.
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• W1497325486 date "1992-01-01" @default.
• W1497325486 modified "2023-09-26" @default.
• W1497325486 title "Induction Motor Modeling Using Coupled Magnetic Field and Electric Circuit Equations" @default.
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