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Induction machines play a pivotal role in industry and there is a strong demand for their reliable and safe operation. They are generally reliable but eventually do wear out. Faults and failures of induction machines can lead to excessive downtimes and generate large losses in terms of maintenance and lost revenues, and this motivates the examination of on-line condition monitoring. On-line condition...
An universal structure of the speed observer is proposed for induction machines. The speed observer is based on extended model of induction machine, in which additional variables are added to a set of state variables. Properties of the proposed observer are presented using simulations of full control systems for the induction machine and experimental results.
Indirect field oriented control of an induction machine requires knowledge of the rotor time constant to estimate the rotor flux linkages. An online method is described for estimating the rotor time constant and the stator resistance both of which vary during operation of the machine due to ohmic heating. The method formulates the problem using a nonlinear least-squares criterion and is guaranteed...
This paper presents a new induction motor model specifically developed for simulating self-sensored variable speed drives which employ signal injection based sensorless control techniques. The model is to be used to investigate improved filtering algorithms and closed loop speed controllers. The model employs a simple state space equivalent circuit based model of the induction machine, which is enhanced...
This paper presents analysis of closed loop and sensorless control of induction machine with broken rotor bar for on-line diagnostics purposes. Closed loop control system synthesis of induction motor is based on symmetrical model of the machine. In case of induction machine operation with broken rotor bars, rotor speed pulsation is compensated by the control system. Simulation of multiscalar control...
Natural Field Orientation (NFO) Control proposed in the 1980psilas is an alternative low cost control method for induction machines. The NFO Control has shown to have some stability issues in regeneration which have been partially addressed in the previous papers. In the present paper a linearised stability analysis is presented for the motor/drive system based on both the non-augmented and the augmented...
Induction motors are critical components in many industrial processes. In spite of their robustness they do occasionally fail and their resulting unplanned downtime can prove very costly. Therefore, condition monitoring of electrical machines has received considerable attention in recent years. A suitable model enables motor faults to be simulated and the change in corresponding parameters to be predicted...
The design of a speed sensorless PWM robust control scheme for an induction motor drive in order to control the rotor speed is proposed. The proposed design is divided in two parts. In the first one it is designed a speed estimator to estimate the rotor speed. In the second one it is developed the proposed robust control. This robust control comprises two parts, the so called inverse dynamic technique...
A differential-algebraic method is used to estimate the rotor time constant TR of an induction motor without measurements of the rotor speed/position. The method consists of solving for the roots of a polynomial equation in TR whose coefficients depend only on the stator currents, stator voltages, and their derivatives. Experimental results are presented
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