Date on Master's Thesis/Doctoral Dissertation

12-2024

Document Type

Master's Thesis

Degree Name

M.S.

Department

Electrical and Computer Engineering

Degree Program

Electrical Engineering, MS

Committee Chair

McIntyre, Michael

Committee Co-Chair (if applicable)

Naber, John

Committee Member

Naber, John

Committee Member

Latham, Joseph

Author's Keywords

Linear compressor; square wave control; single-phase field-oriented control

Abstract

In this thesis, a novel control strategy for an inverter-driven linear compressor system is proposed in which the overall electrical losses of a coupled inverter-linear motor system are reduced through the use of a modified square wave inverter modulation scheme to minimize inverter switching losses at the expense of a modest increase in conduction losses. The controller is based on a single-phase field-oriented control strategy, and to achieve the FOC control objectives, the fundamental and dc components of the applied square wave voltage are matched to the corresponding values requested by the current controller. To validate the efficiency improvements offered by the square wave controller, the switching losses of a 4 kHz PWM control scheme were determined through empirical testing and the conduction losses of both a baseline PWM controller and the proposed square wave controller were quantified via simulation. The results showed that the square wave controller reduced the total electrical losses by 0.366 W at typical operating conditions for a household refrigerator.

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