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This paper describes a new flux observer with voltage error compensation for sensorless AC motor drives. Incorporated with conventional open loop sensorless drive, the proposed observer gives good performance on the speed control like closed loop sensorless drive. Furthermore, the proposed drive system shows robust feature concerned with parameter variation from set-values without direct parameter...
An automatic dynamic balancer is installed on a rotor system in order to reduce radial vibrations caused by eccentricities. However, it is found that due to rolling friction between the balancing balls and race, the ball may not be able to be precisely settled at the desired equilibrium position for each rotor speed-up. This inconsistence of ball mis-positioning results in even larger residual vibrations...
This paper presents the experimental implementation and performance evaluation of a nonlinear controller based speed control of an induction motor (IM) drive. Neglecting the iron loss in an induction motor model causes performance deterioration. In this work, an adaptive backstepping based nonlinear controller incorporating the iron loss in IM model is developed under the parameter uncertainties....
It has been well established in the literature that inverter non-linearity effects afflict saliency based sensorless drives operating in the low and zero speed region. The inverter non-linearity leads to the generation of signals that corrupt the useful position signals. In certain cases, the magnitude of the former signals is comparable if not higher to the latter. Various compensation techniques...
In this paper, we present a Direct Torque and Flux Control (DTFC) scheme of an induction motor operating with a stator resistance PI estimator. The variation of stator resistance due to changes in temperature or frequency degrades the performance of this control strategy, and therefore is a big issue of DTFC. In order to solve this issue, a method of stator resistance estimation using a proportional-...
A robust rotor flux oriented control (RFOC) requires the compensation for the effect of rotor resistance. The variation of rotor resistance due to changes in temperature or frequency degrade the performance of RFOC controller by introducing errors in the estimated flux linkage magnitude, position and the electromagnetic torque. So the compensation for the effect of rotor resistance variation then...
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