A hydrodynamic bearing system for a motor. The motor is illustrated and described as driving a pump for an artificial heart. The motor stator has a cylindrical bore which is closed at one end. The rotor is slidable and rotatable in the bore. The rotor has affixed to its shaft an impeller with its outside...http://www.google.de/patents/US4382199?utm_source=gb-gplus-sharePatent US4382199 - Hydrodynamic bearing system for a brushless DC motor
