Publication Date

Spring 2026

Document Type

Student Project

First Advisor

Mansour Tahernezhadi

Degree Name

B.S. (Bachelor of Science)

Department

Department of Electrical Engineering

Abstract

Common-mode current is a critical diagnostic parameter for predicting radiated electromagnetic emissions in variable-frequency drives (VFDs). At Danfoss, these measurements have traditionally been performed manually by sliding a current transformer along a mains cable—an approach that is slow, operator-dependent, and prone to inconsistent sensor positioning. As regulatory standards tighten and development cycles accelerate, the limitations of 6 this manual process create risks: longer test times, higher labor costs, and an increased likelihood of failing expensive anechoic chamber compliance tests. This project set out to design an automated measurement apparatus capable of improving repeatability, reducing operator workload, and supporting both continuous and step-based scanning modes. The team designed and built a 5-meter automated linear motion apparatus capable of positioning a current-measuring device along a mains cable with high consistency, integrating an Arduino-based motor controller, a dedicated power system, and a full emergency-stop safety circuit. The intended functionality was to reduce operator workload, improve measurement repeatability, and support both continuous and step-based testing modes. The completed system successfully demonstrated significant reductions in test time, improved measurement consistency, and enhanced operator efficiency, showing clear potential to strengthen Danfoss’s internal compliance testing workflow and reduce the risk of costly anechoic chamber retesting.

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