High Efficiency High Density Motor and Generator with Multiple Airgaps

A system comprising:

• a stator with an inner surface and an outer surface, wherein:
• a plurality of first slots is distributed along the inner surface and is separated from each other by a plurality of first teeth;
• a plurality of second slots distributed along the outer surface and is separated from each other by a plurality of second teeth;
• and
• a plurality of windings is located between the inner surface and the outer surface, each of the plurality of windings comprising a plurality of first conductors in a first slot and a plurality of second conductors in a second slot adjacent to the first slot;
• a plurality of rotors magnetically coupled to the stator, wherein a first rotor faces the inner surface of the stator and a second rotor faces the outer surface of the rotor;
• a first airgap between the inner surface of the stator and the first rotor, and a second airgap between the outer surface of the stator and the second rotor, wherein the plurality of first conductors, the first airgap, and the first rotor form a first submotor, and the plurality of second conductors, the second airgap, and the second rotor form a second submotor;
• and
• a plurality of power converters coupled to the plurality of windings, wherein the plurality of power converters are configured to control currents in the plurality of windings so that the first submotor and the second submotor are configured to produce mechanical torques in a same direction in an operation mode.

A method comprising:

• providing a stator with an inner surface and an outer surface, wherein:
• a plurality of first slots is distributed along the inner surface and is separated from each other by a plurality of first teeth;
• and
• a plurality of second slots is distributed along the outer surface and is separated from each other by a plurality of second teeth;
• arranging a plurality of windings between the inner surface and the outer surface, each of the plurality of windings comprising a plurality of first conductors in a first slot and a plurality of second conductors in a second slot adjacent to the first slot;
• providing a plurality of rotors magnetically coupled to the stator, wherein a first rotor of the plurality of rotors faces the inner surface of the stator and a second rotor of the plurality of rotors faces the outer surface of the stator;
• arranging a first airgap between the inner surface of the stator and the first rotor, and a second airgap between the outer surface of the stator and the second rotor;
• and
• configuring the plurality of first conductors, the first airgap, and the first rotor to form a first submotor, and the plurality of second conductors, the second airgap, and the second rotor to form to a second submotor, so that the first submotor and the second submotor produce mechanical torques in a same direction in an operation mode.