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Author: search.filters.author.Chat-Uthai, C.Subject: search.filters.subject.induction motors

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    Estimation of induction motor parameters based on field test coupled with genetic algorithm
    (2002-01-01)
    Phumiphak, T.
    ;
    Chat-Uthai, C.
    This paper proposed a technique for estimating the parameters of three-phase induction motor in order to conduct on-site energy audits of existing motors, which are then used to project a cost savings. This proposed technique uses only a few sets of data (voltage, current, speed, power factor or torque if possible) from the field test of motor (on-site), instead of the no-load and blocked rotor tests, coupled with the genetic algorithm for evaluating the equivalent circuit parameters. Once these parameters are known it is possible to obtain the operating performances (50-100%) of the motor such as efficiency, current, torque. This technique could be suitable for the general purpose drive applications when the motor cannot operate at no-load since its shaft is permanently connected to its load. To illustrate how well the performances of the estimated model matches that of the actual motor obtained from load test, the results of 3 HP and 5 HP induction motors will be presented and compared.
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    A study of harmonics effect on performances of three-phase induction motor using BSRG
    (2002-01-01)
    Lumyong, P.
    ;
    Chat-Uthai, C.
    This paper proposes the technique of brushless synchronous reluctance generator (BSRG) combined with the utility power supply for generating a three-phase nonsinusoidal voltage waveform. The three-phase harmonic voltage waveforms obtained from the BSRG have a phase angle of 120 electrical degree of its order. The amplitude, frequency and sequence direction of three-phase harmonic voltage waveform referenced with the fundamental can be controlled. The nonsinusoidal three-phase voltage source of the fundamental combined with the 2<sup>nd</sup> to 11<sup>th</sup> order harmonic at various voltage-distortion factor (VDF) having positive or negative sequence direction is then supplied for a real load test to investigate the effect on performances of three-phase induction motor. The test results are illustrated and discussed about the order of harmonic having effect on input current and power loss of the motor.