Design and analysis of a compact high-torque permanent magnet vernier machine for a portable MRI system
Ayar, Nina
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https://hdl.handle.net/2142/129994
Description
Title
Design and analysis of a compact high-torque permanent magnet vernier machine for a portable MRI system
Author(s)
Ayar, Nina
Issue Date
2025-07-25
Director of Research (if dissertation) or Advisor (if thesis)
Haran, Kiruba S.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Permanent Magnet Machine
Vernier
Compact Machine
Torque Density Maximization
Portable Medical Devices
Mri
Language
eng
Abstract
Low-field magnetic resonance imaging (MRI) has gained interest in recent years as a more accessible and economical alternative to conventional high-field MRI systems. Advancements in hardware design and machine learning algorithms have improved the clinical viability of low-field systems, enhancing their suitability for widespread medical usage and contributing to more equitable access to diagnostic imaging. An innovative portable low-field MRI device utilizes three rotating magnet arrays to provide spatial information required for imaging. In this system, strict size constraints necessitate compact motors capable of deliver- ing high torque consistently. Permanent magnet vernier machines (PMVM) have emerged as a promising alternative, offering high torque at low speeds through the magnetic gearing effect. This topology has been successfully employed in other direct-drive applications and is well-suited for this use case. This thesis presents the design, analysis, and assembly of a compact, torque-dense PMVM tailored for use with a novel portable MRI system. Emphasis is placed on achieving a small form factor, high torque production, and fine angular resolution. The combined electromagnetic design and control scheme establish a solid foundation for prototyping and deploying the machine in practical, high-torque, space-limited applications.
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