Modeling and control of interior permanent magnet synchronous machines at low switching-to-fundamental frequency ratios

Electric vehicles have the potential to reduce carbon emissions and transform the transportation sector. An interior permanent magnet synchronous machine (IPMSM) offers high-power density and can operate over a wide speed range which makes it an attractive option for electric vehicles. Furthermore, it is more mechanically robust in comparison to a surface-mounted permanent magnet synchronous machine (SPMSM) due to the magnets being embedded within the rotor. Electric vehicles tend to operate at low ratios of switching-to fundamental frequency which can lead to challenges from a current control perspective. This thesis investigates control algorithms for IPMSMs when operating at a low ratio of switching-to-fundamental frequency. This work first examines the conventional scalar current control approach used and identifies its shortcomings. It then proposes an alternative current controller that has the potential to improve performance at low frequency ratios. A complex vector model of an IPMSM is derived in order to design the proposed complex vector controller. Simulations are performed to verify that the designed controller does indeed allow for adequate current control of the machine. Preliminary experimental results are presented showing that the controller has the potential to lead to controller performance improvements primarily at low switching-to-fundamental frequency ratios. Finally, the thesis concludes with a summary of the contributions and results and provides insight into future work that can be completed in this area.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Electrical & Computer Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2022

Author dc:creator

• Tungare, Samira

Contributors dc:contributor

• Banerjee, Arijit

• Interior Permanent Magnet Synchronous Machines
• Electric Drives
• Current Control

Statement dc:rights

• Copyright 2022 Samira Tungare

Language dc:language

en, eng

Handle dc:identifier

https://hdl.handle.net/2142/115625

OAI record oai:identifier

https://www.ideals.illinois.edu/oai-pmh?verb=GetRecord&metadataPrefix=etdms&identifier=oai%3Awww.ideals.illinois.edu%3A2142%2F115625