Control of a High-speed (<50,000 rpm) Interior Permanent Magnet Synchronous Motor
type: CreativeWork
description: High-speed interior permanent magnet synchronous motors (HS-IPMSMs) play a critical role in modern industrial and automotive applications, yet their performance is often constrained by losses, parameter variations, and deadtime effects. This thesis investigates advanced field-oriented control (FOC) strategies to address these challenges, with a particular focus on improving efficiency and robustness in HS-IPMSM operation. A comprehensive review of existing control methods highlights the limitations of conventional maximum torque per ampere (MTPA) and loss minimization control (LMC) strategies under parameter variations, particularly in the presence of core loss. To enhance system performance, an improved MTPA strategy that explicitly accounts for core loss is proposed, alongside a novel LMC method that incorporates the partial derivative of core loss resistance with respect to the d-axis current. Analytical and experimental validation on a HS-IPMSM (5kW, 50,000 rpm) demonstrate that these methods effectively reduce electrical losses. Additionally, a hybrid trajectory combining MTPA and LMC is developed to balance efficiency and torque output across varying load conditions. Further investigation into motor parameter variations reveals their substantial impact on both MTPA and LMC performance. A systematic analysis identifies optimal parameter selection strategies, enhancing robustness in real-world applications. To overcome the limitations of polynomial-fitting-based methods, a novel Taylor-series-based approach is proposed for both LMC and MTPA control method (under torque control mode), enabling real-time adaptation to parameter fluctuations through lookup-table-based online estimation. Experimental results confirm its effectiveness in improving efficiency with negligible influence on dynamic performance. The thesis also addresses deadtime-induced distortions, proposing a compensation technique for both static inductance measurement and real-time current control. A…
abstract: High-speed interior permanent magnet synchronous motors (HS-IPMSMs) play a critical role in modern industrial and automotive applications, yet their performance is often constrained by losses, parameter variations, and deadtime effects. This thesis investigates advanced field-oriented control (FOC) strategies to address these challenges, with a particular focus on improving efficiency and robustness in HS-IPMSM operation. A comprehensive review of existing control methods highlights the limitations of conventional maximum torque per ampere (MTPA) and loss minimization control (LMC) strategies under parameter variations, particularly in the presence of core loss. To enhance system performance, an improved MTPA strategy that explicitly accounts for core loss is proposed, alongside a novel LMC method that incorporates the partial derivative of core loss resistance with respect to the d-axis current. Analytical and experimental validation on a HS-IPMSM (5kW, 50,000 rpm) demonstrate that these methods effectively reduce electrical losses. Additionally, a hybrid trajectory combining MTPA and LMC is developed to balance efficiency and torque output across varying load conditions. Further investigation into motor parameter variations reveals their substantial impact on both MTPA and LMC performance. A systematic analysis identifies optimal parameter selection strategies, enhancing robustness in real-world applications. To overcome the limitations of polynomial-fitting-based methods, a novel Taylor-series-based approach is proposed for both LMC and MTPA control method (under torque control mode), enabling real-time adaptation to parameter fluctuations through lookup-table-based online estimation. Experimental results confirm its effectiveness in improving efficiency with negligible influence on dynamic performance. The thesis also addresses deadtime-induced distortions, proposing a compensation technique for both static inductance measurement and real-time current control. A…
author: Gao, Minghao
language: en
keywords: IPMSM, efficiency,, motor control, high-speed, anzsrc-for: 400806 Electrical machines and drives
license: https://purl.org/coar/access_right/c_abf2
license: https://creativecommons.org/licenses/by/4.0/
date published: 2025
date modified: 2026-07-24T05:32:40Z
provider: University of New South Wales
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: UNSW, Sydney

PropertyValue
property ID: Handle
value: http://hdl.handle.net/1959.4/105089

PropertyValue
property ID: DOI
value: 10.26190/unsworks/31194