Axial flux motor for percutaneous circulatory support device

An axial flux motor, comprising:

• a housing;
• a drive shaft disposed within the housing;
• at least one rotor having a diameter from 0.5 mm to 20 mm, the at least one rotor comprising a diametrically-magnetized single pole pair magnetic ring having a rotor aperture defined through the center of the magnetic ring, wherein the drive shaft extends through the rotor aperture and wherein the at least one rotor is fixed to the drive shaft;
• and
• at least one stator, the at least one stator comprising a plurality of conductive windings arranged around the drive shaft and a stator aperture, wherein the drive shaft extends through the stator aperture and wherein the drive shaft is rotatable within the aperture, wherein the at least one stator does not include a stator core, and wherein the at least one stator is configured to generate an axial magnetic field that causes the at least one rotor to rotate, thereby rotating the drive shaft;
• a first bearing rotatably coupled to the drive shaft;
• a second bearing rotatably coupled to the drive shaft, such that the at least one rotor and the at least one stator are disposed between the first bearing and the second bearing;
• a first Hiperco alloy flux return disc disposed between the first bearing and the at least one rotor and the at least one stator;
• and
• a second Hiperco alloy flux return disc disposed between the second bearing and the at least one rotor and the at least one stator;
• wherein the motor is configured to drive an impeller of a percutaneous mechanical circulatory support device, wherein the impeller is coupled to the drive shaft.

A percutaneous mechanical circulatory support device, comprising:

• a housing;
• a drive shaft disposed within the housing;
• an impeller configured to be driven by the drive shaft;
• a plurality of rotors each having a diameter from 0.5 mm to 20 mm, each of the plurality of rotors comprising a diametrically-magnetized single pole pair magnetic ring having a rotor aperture defined through the center of the magnetic ring, wherein the drive shaft extends through the rotor aperture and wherein the rotor is fixed to the drive shaft;
• and
• a plurality of stators, each stator of the plurality of stators comprising a plurality of conductive windings and a stator aperture, wherein the drive shaft extends through the stator aperture and wherein the drive shaft is rotatable within the aperture, and wherein each stator of the plurality of stators is configured to generate an axial magnetic field that causes at least one adjacent rotor of the plurality of rotors to rotate, thereby rotating the drive shaft and the impeller;
• a first bearing rotatably coupled to the drive shaft;
• a second bearing rotatably coupled to the drive shaft, such that the plurality of rotors and the plurality of stators are disposed between the first bearing and the second bearing;
• a first Hiperco alloy flux return disc disposed between the first bearing and the plurality of rotors and the plurality of stators;
• and
• a second Hiperco alloy flux return disc disposed between the second bearing and the plurality of rotors and the plurality of stators.