Modeling and design of air vane motors for minimal torque ripples

Cheng Wei Cheng, Chao-Chieh Lan, Chun Yi Tseng

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


This paper presents the analysis and design of a novel air vane motor. Air motors have a very high specific power. They require compressed air rather than electricity to produce motion; thus, they avoid sparks and can be used in demanding environments. Similar to other types of rotary machines, air vane motors exhibit torque fluctuations. The varying torque curve is a result of unmatched torques generated by the vanes in one revolution. Accompanying the torque fluctuations are dynamic speed ripples that produce undesirable vibration on the load side. Rather than using auxiliary flywheels or dampers to smoothen the fluctuation, we propose a new motor with noncircular stator profile so as to increase the flexibility of balancing vane torques. Through numerical optimization of the parametric noncircular profile, a nearly constant torque curve can be achieved. Experiments validate that the speed ripples are greatly suppressed without compromising performance, when compared with traditional air vane motors that employ circular stator profiles. We expect that the noncircular stator profile design can be applied to air vane motors of various sizes to minimize torque and speed ripples.

Original languageEnglish
Article number051003
JournalJournal of Mechanical Design, Transactions of the ASME
Issue number5
Publication statusPublished - 2012 Apr 24

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design


Dive into the research topics of 'Modeling and design of air vane motors for minimal torque ripples'. Together they form a unique fingerprint.

Cite this