Abstract
Abstract Wide use of induction motor drives makes the problems related to induction motors very topical. One of such problems is the maximal utilization of torque and velocity of induction motors. In this regard the use and accurate adjustment of rotor magnetic flux observers may be helpful. The technique of observer adjustment is subject of special interest. This technique can be regarded as optimal if it ensures constant acceleration that, in turn, corresponds to constant magnitude of active and magnetizing components of stator current. In contrast, nonoptimal tuning of the magnetic flux observer creates a transient response caused by variation of magnetic and active components of the stator current resulting in changing acceleration of the motor. However, the parameters of non-optimal process can be used for fine tuning of the observer which considers the variation of the time constants obtained analyzing the drive's magnetic circuit saturation. It is possible to conclude that implementation of fine adjustment of rotor magnetic flux observer is of critical importance for induction motor torque and velocity maximum utilization.
Highlights
Induction motors with squirrel-cage rotors are generally used in the industry nowadays
The distinctive feature of such controlling system is the occurrence of the rotor magnetic field observer for phase coordinates transformation determination [1,2,3]
The first group consists of the observers, which use the information about stator line currents and rotor position or velocity [4,5,6,7]
Summary
Induction motors with squirrel-cage rotors are generally used in the industry nowadays. The application of the first group observers is preferred more in the cases when the dominant requirement is the support of fast response in torque loop and wide range of regulation. The observers from the second group support considerably smaller range of regulation and weaker performance of torque loop, but allow diminishing the cost of the electric motor drive. Apart from the types of the used observers, to ensure the integrity of the controlling system requires the estimation of motor parameters including those the direct determination of which is difficult or impossible. They are rotor characteristic time Tr and stator-rotor mutual inductance L12. The observer parameters should be corrected depending on external factors
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