Patent ID: 8905733

Claim:
A progressing cavity pump/motor, comprising: a stator having an interior surface with two or more spiraling lobes; a rotor having an exterior surface with one or more spiraling lobes, the one or more lobes of the rotor cooperating with the two or more lobes of the stator to form progressing cavities between the stator and the rotor during rotation of the rotor within the stator; and a plurality of spaced grooves formed on a portion of a spiraling lobe on at least one of the stator interior surface and the rotor exterior surface to disrupt the flow of fluid flowing through a gap between the stator interior surface and the rotor exterior surface to reduce fluid leakage between the stator and the rotor; wherein ach of the plurality of spaced grooves is parallel to a centerline of the spiraling lobe on which the spaced groove is formed.