Abstract

In the presented work a new identification method of difficult measured internal quantities of IM, such as components of magnetic flux vector and electromagnetic torque, is proposed. Commonly measurable quantities of IM like stator currents, stator voltage frequency and mechanical angular speed are used for identification to determine a feedback effect of the rotor flux vector on vector of stator currents of IM. Based on this feedback it is also possible to identify actual value of the rotor resistance, which can alter during IM operation. This has a significant impact on precision of identified quantities as well as on master control of IM. Stability of the identification structure is guaranteed by position of roots of characteristic equation of its linear transfer function. Results obtained from simulation measurements confirm quality, effectivity, feasibility, and robustness of the proposed identification method.

Highlights

  • The use of induction motors (IMs) in electric drives introduces indisputable advantages consisting in their simple design, maintenance, operational reliability and efficiency

  • This paper proposes a new high-quality dynamic identification structure for IM based on its mathematical model and allowing to identify rotor magnetic fluxes and IM electromagnetic torque simultaneously with an on-line adaptation of the rotor resistance

  • The properties of the rotor flux and torque identification method are verified by the simulation in various operating states

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Summary

Introduction

The use of induction motors (IMs) in electric drives introduces indisputable advantages consisting in their simple design, maintenance, operational reliability and efficiency. For high quality control algorithms it is necessary to identify motor parameters and internal quantities that are changed during operation of the electric drive system, for example due to temperature fluctuations or magnetic flux saturation. In the literature many approaches to determine basic stationary parameters of IMs are presented, such as winding resistances, main and leakage inductances and moment of inertia on the motor shaft, where their exact determination can significantly affect precision of the IM control. The literature [6] compares two methods of determining parameters of IM in steady state, while saturation of the magnetic circuit is considered. A review article on methods of on-line and off-line identification of IM parameters is given in [9]

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