Prototypes of axially driven permanent maglev centrifugal pump with streamlined impeller

Three prototypes of axially driven permanent maglev centrifugal pumps have been developed in authors’ laboratory. The first one has a DC motor, which drives the pump via magnetic coupling; the second has a motor coil, which drives the pump directly with a rotating magnetic field, thus the length of the device has been reduced from 120 mm to 70 mm; the third for in vivo application has the diameter decreased from 45 mm of the second one to 30 mm. In each prototype, the rotor is bore by permanent magnetic bearings and has no mechanical contact with the stator; the impellers have a streamlined design and thus the pump’s H-Q curves are straight lines, indicating there is neither mechanical friction loss nor turbulent flow loss in the device.