Patent ID: 6923618

Claim:
A rotary motor comprising: a housing having a circular cavity of a cavity diameter, the circular cavity being bounded by a cavity wall, and the housing having an inlet and an outlet that provide fluid communication to and from the circular cavity; a rotor having a circular body, the circular body being of a rotor diameter that is smaller than the cavity diameter, the rotor being positioned within the circular cavity with the rotor being spaced apart and in a generally concentric manner with the circular cavity to define an expansion track; and at least one sealing fin, the sealing fin being attached to the circular body and extending from the circular body to the cavity wall sealing the expansion track, the sealing fin being positioned along the circular body such that there is only one sealing fin between the inlet and the outlet during rotation of the circular body, so that delivery of a pressurized gas through the inlet allows expansion of the gas in the expansion track and against the sealing fin, urging the rotation of the rotor.