A magnetically driven centrifugal pump includes a sealed housing enclosing a magnetically driven rotor on an axle of rotation contained within the housing, the axle being attached to the back inside wall of the housing and extending therefrom into the rotor, the rotor having impellers attached to the...http://www.google.es/patents/US4927337?utm_source=gb-gplus-sharePatente US4927337 - Magnetically driven pump
