Air motor with increased dwell at max vane extension

A pneumatic motor configured, the pneumatic motor comprising:

• a stator disposed within the housing, the stator having a stator inner wall including a dwell region;
• a rotor eccentrically disposed within the stator, the rotor configured to rotate about an axis of rotation and having an outer surface;
• and
• a plurality of vanes disposed around the rotor, each vane of the plurality of vanes configured to slide within a respective slot formed in the outer surface of the rotor between a fully retracted position and a fully extended position as the rotor rotates about the axis of rotation to maintain contact with the stator inner wall;
• wherein the stator inner wall has a radius relative to the axis of rotation that is substantially constant within the dwell region so that vanes of the plurality of vanes are in the fully extended position within the dwell region.

A pneumatic motor configured to supply a motive force, the pneumatic motor comprising:

• a stator disposed within the housing, the stator having a stator inner wall including a dwell region;
• a rotor eccentrically disposed within the stator, the rotor configured to rotate about an axis of rotation and having an outer surface;
• and
• a plurality of vanes disposed around the rotor, each vane of the plurality of vanes configured to slide within a respective slot formed in the outer surface of the rotor between a fully retracted position and a fully extended position as the rotor rotates about the axis of rotation to maintain contact with the stator inner wall;
• wherein the stator inner wall has a radius relative to the axis of rotation that is substantially constant within the dwell region so that vanes of the plurality of vanes are in the fully extended position within the dwell region, and
• where the stator inner wall has a cam geometry following a cycloidal cam profile that eases the transition of the plurality of vanes as they slide between the fully retracted position and the fully extended position.