A downhole submersible fluid pump having a progressive cavity motor section driving a rotary pump such as a centrifugal or axial pump. In the motor section an inner helical member is fixed relative to an outer rotatable member having helical threads. By forcing power fluid into the motor chamber between...http://www.google.com/patents/US6019583?utm_source=gb-gplus-sharePatent US6019583 - Reverse moineau motor
