Research on control systems for high-speed, high-overload permanent magnet synchronous motors

Ma, Hongtai

Research on control systems for high-speed, high-overload permanent magnet synchronous motors

Ma, Hongtai

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Publication Type:: Thesis
Issue Date:: 2025

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Field	Value	Language
dc.contributor.author	Ma, Hongtai
dc.date.accessioned	2026-05-07T06:15:55Z
dc.date.available	2026-05-07T06:15:55Z
dc.date.issued	2025
dc.identifier.uri	http://hdl.handle.net/10453/194899
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_US.UTF-8
dc.description.abstract	Battery-powered intelligent equipment has stringent power density requirements for power electronic drive systems. The design of high-power density equipment poses significant challenges to the current loop and electromagnetic interference performance of motors. Under high-intensity magnetic fields, the motor core will experience saturation, and the combined effect of motor slots introduces nonlinearity to the motor model. The classic linear control of motors at high speeds would result in decoupling failure of the current loop control and even decreased stability. Moreover, the utilization of wide-bandgap devices and dense layout wiring can worsen the electromagnetic environment, thereby reducing system reliability. The main research objectives and innovative contributions of this thesis are as follows: 1) For permanent magnet synchronous motors, a nonlinear model based on data considering cross-coupling and slotting effects is established, and a distributed parameter high-frequency system model developed for the drive system. 2) The latch and delay of inverters in digital control systems are modeled. Based on the model, a flux-based complex vector controller is proposed based on the motor's nonlinear model to improve the bandwidth and stability of saturated motors under low modulation ratio. 3) Harmonics analysis is performed for active zero vector pulse width modulation and near state pulse width modulation. Then, a hybrid spread spectrum modulation method is proposed based on the motor's nonlinear model, which could extend the current spectrum, maintain current harmonics, and reduce electromagnetic conducted emission. 4) To validate the proposed control strategies, an experimental prototype is designed and fabricated. The prototype adopts a layered design, resembling the shape of the motor, allowing heat dissipation through the motor casing to reduce volume and weight. Additionally, a set of control software is developed, and human-machine interface software is written to control the high-power density motor developed in the laboratory, verifying the effectiveness of the proposed highly saturated permanent magnet synchronous motor current control and spreading control algorithms. These innovative contributions enhance the control performance of high-power density power electronic drive systems, mitigate electromagnetic interference to external systems, and improve the stability and reliability of the system itself. This research significantly contributes to the enhancement of power density in battery powered power electronic devices, such as electric vehicles, biomimetic robots, and electric aircraft.	en_US.UTF-8
dc.format	Thesis (PhD)
dc.language.iso	en_US	en_US.UTF-8
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	© 2025 Hongtai Ma
dc.rights	au.edu.uts.lib/nph
dc.title	Research on control systems for high-speed, high-overload permanent magnet synchronous motors	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

Battery-powered intelligent equipment has stringent power density requirements for power electronic drive systems. The design of high-power density equipment poses significant challenges to the current loop and electromagnetic interference performance of motors. Under high-intensity magnetic fields, the motor core will experience saturation, and the combined effect of motor slots introduces nonlinearity to the motor model. The classic linear control of motors at high speeds would result in decoupling failure of the current loop control and even decreased stability. Moreover, the utilization of wide-bandgap devices and dense layout wiring can worsen the electromagnetic environment, thereby reducing system reliability. The main research objectives and innovative contributions of this thesis are as follows: 1) For permanent magnet synchronous motors, a nonlinear model based on data considering cross-coupling and slotting effects is established, and a distributed parameter high-frequency system model developed for the drive system. 2) The latch and delay of inverters in digital control systems are modeled. Based on the model, a flux-based complex vector controller is proposed based on the motor's nonlinear model to improve the bandwidth and stability of saturated motors under low modulation ratio. 3) Harmonics analysis is performed for active zero vector pulse width modulation and near state pulse width modulation. Then, a hybrid spread spectrum modulation method is proposed based on the motor's nonlinear model, which could extend the current spectrum, maintain current harmonics, and reduce electromagnetic conducted emission. 4) To validate the proposed control strategies, an experimental prototype is designed and fabricated. The prototype adopts a layered design, resembling the shape of the motor, allowing heat dissipation through the motor casing to reduce volume and weight. Additionally, a set of control software is developed, and human-machine interface software is written to control the high-power density motor developed in the laboratory, verifying the effectiveness of the proposed highly saturated permanent magnet synchronous motor current control and spreading control algorithms. These innovative contributions enhance the control performance of high-power density power electronic drive systems, mitigate electromagnetic interference to external systems, and improve the stability and reliability of the system itself. This research significantly contributes to the enhancement of power density in battery powered power electronic devices, such as electric vehicles, biomimetic robots, and electric aircraft.

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http://hdl.handle.net/10453/194899