A New Scroll-type Air Motor with Magnetic Spirals

Xing Luo, Jihong Wang, Leon Shpanin, Mark Dooner

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
57 Downloads (Pure)


The scroll-type air motor, also named the scroll expander, has been widely used for different applications due to its characteristics of compact structure and high energy conversion efficiency. However, the leakage and the friction result in non-negligible energy losses. This paper presents the recent work on developing a new scroll-type air motor with mounted permanent magnetic spirals and investigates its potential in leakage reduction and efficiency improvement, especially at low-pressure air supply conditions. A method for the implementation of the magnetic scroll air motor is proposed. A prototype is manufactured and initial experimental tests are conducted to study the generalized torque distribution. A mathematical model for the magnetic scroll air motor is developed and a corresponding simulation study is presented. The study shows that the proposed magnetic scroll air motor structure is feasible in terms of manufacturing and has the potential to reduce the air leakage and thus to improve the energy efficiency by a maximum of around 15% at a supply pressure of Pa with a flank leakage clearance reference of 0.06mm.

Original languageEnglish
Pages (from-to)459-468
Number of pages10
JournalIEEE/ASME Transactions on Mechatronics
Issue number1
Early online date17 Nov 2017
Publication statusPublished - Feb 2018

Bibliographical note

This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/


  • Scroll-type Air Motor
  • Prime Mover of Generator
  • Magnetic
  • Mathematical Modelling and Energy Efficiency


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