Date of Award

5-2026

Degree Name

Master of Science in Engineering

Department

Electrical and Computer Engineering

First Advisor

Sandun Kuruppu, Ph.D.

Second Advisor

Damon Miller, Ph.D.

Third Advisor

Radu Babiceanu, Ph.D.

Keywords

Extremum seeking control, field-oriented control, permanent magnet synchronous motors, pmsm, position sensor offset error, speed-controlled motor drives

Access Setting

Masters Thesis-Open Access

Abstract

Position sensor offset errors present a persistent challenge in speed-controlled permanent magnet synchronous motor drives operating under field-oriented control. Even small, constant offsets in the measured rotor position can reduce torque effectiveness, requiring increased current and voltage demand to maintain the commanded speed and resulting in degraded speed regulation performance across a range of operating conditions. These effects are particularly problematic in speed-controlled systems, where speed loop dynamics cause increased electrical effort and limit overall performance. Many existing detection and compensation approaches are either dependent on the system model, require offline calibration, or are primarily designed for torque-controlled operation. This restricts practical usage in speed-regulated drives.

This work presents a model-independent, real-time compensation strategy for rotor position sensor offset errors in speed-controlled drives. The proposed method is based on the observation that the steadystate q-axis voltage reference exhibits a unimodal dependence on the magnitude of the position sensor offset. By utilizing this relationship, an extremum seeking control algorithm is used to compensate and estimate the offset online without requiring explicit knowledge of the motor parameters or additional sensing hardware. The offset correction is applied directly within the control system to adjust the rotor position used by the field-oriented control transformations.

The effectiveness of the proposed approach is evaluated through simulation and experimental testing under varying speed and load conditions. Results demonstrate reliable online compensation and quantified estimation of position sensor offsets, leading to improved and restored system performance. These results indicate that extremum seeking control provides a practical and effective framework for real-time adaptation in speed-controlled permanent magnet synchronous motor drives affected by rotor position sensor offset error.

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