Measurement Setup Consideration and Implementation for Inductively Coupled Online Impedance Extraction

TL;DR

This thesis develops an improved inductive coupling measurement setup and calibration techniques for online impedance extraction, addressing challenges like probe coupling effects and electrical noise, with applications in motor fault detection and power device characterization.

Contribution

It introduces a novel measurement setup and calibration method for more accurate online impedance extraction using inductive coupling techniques.

Findings

Enhanced measurement accuracy through three-term calibration.

Effective online detection of motor stator faults.

Non-intrusive capacitance extraction of SiC MOSFETs.

Abstract

This thesis is organized as follows: Chapter 1 introduces the background, motivation, objectives, and contributions of this thesis. Chapter 2 presents a review of existing online impedance extraction approaches. Chapter 3 proposes the improved measurement setup of the inductive coupling approach and introduces the theory behind time-variant online impedance extraction. Chapter 4 develops a three-term calibration technique for the proposed measurement setup to deembed the effect of the probe-to-probe coupling between the inductive probes with the objective to improve the accuracy of online impedance extraction. Chapter 5 discusses the additional measurement setup consideration in industrial applications where significant electrical noise and power surges are present. Chapter 6 discusses and demonstrates the application of the inductive coupling approach in online detection of the incipient stator faults in the inverter-fed induction motor. Chapter 7 further extends the application of this approach for non-intrusive extraction of the voltage-dependent capacitances of the silicon carbide (SiC) power metal-oxide-semiconductor field-effect transistor (MOSFET). Finally, Chapter 8 concludes this thesis and proposes future works that are worth exploring.