2026-09-24T15:18:45Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/129994 2025-10-25 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

application/pdf en text Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms The student, Nina Ayar, accepted the attached license on 2025-07-25 at 07:46. The student, Nina Ayar, submitted this Thesis for approval on 2025-07-25 at 07:52. This Thesis was approved for publication on 2025-07-25 at 11:32. DSpace SAF Submission Ingestion Package generated from Vireo submission #22736 on 2025-10-20 at 20:15:48 Design and analysis of a compact high-torque permanent magnet vernier machine for a portable MRI system Ayar, Nina 2025-07-25 Haran, Kiruba S. Permanent Magnet Machine Vernier Compact Machine Torque Density Maximization Portable Medical Devices Mri eng 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. 2025-08 Text https://hdl.handle.net/2142/129994 Copyright 2025 Nina Ayar Electrical & Computer Eng Electrical & Computer Engr University of Illinois Urbana-Champaign M.S. Thesis