Machine Design and Precision Current Regulation for the Parallel DPNV Bearingless Motor Winding

Nathan Petersen, Anvar Khamitov, Timothy Slininger, Eric L. Severson

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The parallel dual-purpose no-voltage (DPNV) winding topology offers appreciable advantages for high speed and significant power bearingless motor designs. Precision current regulation is required to realize the high-performance potential of bearingless motors using parallel DPNV windings. The performance of the machine hinges on the ability to decouple the voltage disturbance between the torque and suspension systems at all operating conditions, including high electrical frequencies. Two pathways are investigated to achieve precision actuation: 1) machine design and/or feedforward control to systematically reduce the voltage disturbance, and 2) direct digital design of the current regulator for high-speed operation. Analytical models are constructed, which gives insight into the root cause of the cross-coupling as a function of the physical winding design. It is shown that all practical machine designs produce some level of voltage disturbance which can be directly eliminated via a feedforward voltage added to the torque winding current regulator. The state-of-The-Art current regulation methods for the parallel DPNV winding are progressed to enable extended operating ranges for the targeted high speed and bandwidth conditions. By codesigning the machine and controls, more optimized designs are possible by trading off torque ripple and force density.

Original languageEnglish (US)
Pages (from-to)7000-7011
Number of pages12
JournalIEEE Transactions on Industry Applications
Issue number6
StatePublished - 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 1972-2012 IEEE.


  • Bearingless motor
  • combined winding
  • current regulation
  • machine design
  • self-bearing motor


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