Energy Efficient Control of an Induction Machine under Load Torque Step Change

TL;DR

This paper develops an optimal control strategy for induction motors to minimize power losses during load torque changes, considering practical limitations like bandwidth and saturation, validated through hardware experiments.

Contribution

It introduces a feedback-based optimal control method for induction motors that accounts for saturation and bandwidth constraints, with experimental validation.

Findings

Optimal control reduces power losses during load changes.

Sub-optimal control performs well under saturation conditions.

Hardware experiments confirm theoretical results.

Abstract

Optimal control of magnetizing current for minimizing induction motor power losses during load torque step change was developed. Obtained strategy has feedback form and is exactly optimal of ideal speed controller performance and absence of saturation in motor. The impact of limited bandwidth of real speed controller is analyzed. For case of main induction saturation the sub-optimal optimal control is suggested. Relative accuracy of sub-optimality is studied. Hardware implementation of optimal strategy and experimentation conducted with induction motors under vector control.