Abstract

A novel speed-flux tracking controller for induction motors has been developed and experimentally verified. Direct rotor flux field oriented controller is designed for current-fed induction motor model on the base of full order hybrid continuous time-sliding mode flux observer. Controller guarantees local asymptotic speed-flux tracking and asymptotic direct field-orientation under condition of unknown constant load torque. The flux subsystem is invariant with respect to limited rotor resistance variations due to special structure of the flux observer. The efficiency of the proposed solution is confirmed by the results of experimental studies, which demonstrate the improved robustness properties in all motor operating conditions including nearby zero speeds.

Highlights

  • Vector controlled Induction Motor (IM) drives are widely used electromechanical systems suitable for medium and high performance applications including general industrial and electric traction fields

  • The experiments were performed in order to compare dynamic performances and efficiency of the two algorithms: proposed direct field oriented control with rotor resistance invariant observer (4) (I-DFOC) and robust indirect field oriented control [6] (R-IFOC)

  • The Rapid Prototyping Station (RPS) includes: a personal computer acting as the operator interface for programming, debugging, virtual oscilloscope function; a custom floating-point Digital Signal Processor board (TMS320F28335); 20A/380V three-phase inverter, fPWM =10 kHz during experiments; two 2.2 kW induction motors, whose rated data are listed in the Appendix

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Summary

Introduction

Vector controlled Induction Motor (IM) drives are widely used electromechanical systems suitable for medium and high performance applications including general industrial and electric traction fields. Vector Field Oriented Control (FOC) [1] of IM established a de-facto industrial standard for such applications. Different modifications of indirect and direct field oriented controllers (IFOC, DFOC) have been developed during last few decades to improve dynamic performance and efficiency of the drive systems. In all solutions, based on FOC concept, the flux control subsystem is sensitive to IM parameters variation, especially the rotor resistance (see [3] and references included). As a consequence of rotor resistance perturbations the field orientation is missed, leading to errors in rotor flux vector control (modulus and angle). The wrong field orientation causes degradation of torque and speed transient performance and reduced efficiency of the electromechanical energy conversion

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