Magnetic Variables Control

Abstract

The sections in this article are Mathematical Modeling of an Induction Machine Principles of Vector Control of Induction Machines Parameter Variation Effects in Rotor Flux Oriented Induction Machines Compensation of Parameter Variation Effects Optimal Efficiency Control Speed‐Sensorless Control Trends in Vector Control of Induction Machines

Experimental evaluation of parameter variation effects in indirect rotor‐flux oriented induction‐motor drives

“…Operation with reduced rotor flux leads to an increase in the magnetising inductance in the machine. It is therefore necessary to compensate for this variation, either by embedding the magnetising curve in the control system [2,7,8] or by providing online identification of the magnetising inductance [9]. The simpler of the two approaches, implemented in the drive used here, is to modify the vector control scheme by including the magnetising curve in it.…”

“…Main flux saturation is compensated by embedding the inverse magnetising curve of the machine in the controller. As shown in [7], an indirect feed-forward rotor-flux oriented controller with partial compensation of main flux saturation can be described with the following equations: [2,7].…”

“…It is therefore possible to further simplify eqs. (2) to (3), by neglecting the rate of change of the rotor flux reference. Hence from eqs.…”

“…All the vector control schemes require utilisation of some of the machine parameters in the control part of the drive, so that any discrepancies between the parameter values assumed in the controller and the actual values in the machine lead to detuned operation. The issues of parameter variation effects and means for their compensation have been the subject of major interest in recent past and remain to attract considerable attention of the research community [2]. Theoretical foundations of detuned operation in both steady-states and transients are well established and all the possible detuning sources have been analysed in considerable depth [2].…”

“…The issues of parameter variation effects and means for their compensation have been the subject of major interest in recent past and remain to attract considerable attention of the research community [2]. Theoretical foundations of detuned operation in both steady-states and transients are well established and all the possible detuning sources have been analysed in considerable depth [2].…”