Double stator permanent magnet machine

A double stator permanent magnet machine comprises:

• an inner stator, further comprising a back iron, a set of inner stator poles connected to and extending radially outward from the back iron spaced at a set of equal inner angular intervals, a set of inner stator windings disposed within the set of inner stator poles, and a first shaft;
• a rotor, further comprising a set of segments, an outer cage attached to the set of segments, and a second shaft connected to the outer cage, each segment of the set of segments further comprising a permanent magnet, rotatively connected to the inner stator;
• wherein the first shaft and the second shaft share a common axis;
• the first shaft fixed with respect to the common axis;
• the second shaft rotatable about the common axis;
• a first segment of the set of segments including a first permanent magnet with a polarity that is substantially tangential to a direction of motion the rotor;
• an outer stator, further comprising a set of outer stator poles spaced at a set of equal outer angular intervals and a set of outer stator windings disposed within the set of outer stator poles rotatively connected to the rotor;
• a set of phases, each phase further comprising a subset of the set of inner stator windings and a subset of the set of outer stator windings;
• wherein
• a first subset of outer stator windings of the set of outer stator windings of a first phase of the set of phases on a first side of a center axis of the double stator permanent magnet machine,
• a second subset of outer stator windings of the set of outer stator windings of the first phase on a second side of the center axis that is opposite to the first side,
• a first subset of inner stator windings of the set of inner stator windings of the first phase on the second side of the center axis and adjacent to the second subset of outer stator windings, and
• a second subset of inner stator windings of the set of inner stator windings of the first phase on the first side of the center axis and adjacent the first subset of outer stator windings are connected directly in series;
• and,
• wherein a current is selectively connected to the set of phases to effect a rotation of the rotor about the shaft.

A method for operating a double stator permanent magnet machine comprising the steps of:

• providing an inner stator, further comprising a back iron, a set of inner stator poles connected to the back iron, and a first shaft;
• providing a rotor, further comprising an outer cage, a second shaft connected to the outer cage, and a set of segments connected to the outer cage, each segment further comprising a permanent magnet, rotatively coupled to the inner stator;
• wherein the first shaft and the second shaft share a common axis;
• the first shaft fixed with respect to the common axis;
• the second shaft rotatable about the common axis;
• providing a first segment of the set of segments including a first permanent magnet with a polarity that is substantially tangential to a direction of motion the rotor;
• providing an outer stator, further comprising a set of outer stator poles, rotatively coupled to the rotor;
• providing a set of inner stator windings disposed between each of the inner stator poles;
• providing a set of outer stator windings disposed between each of the outer stator poles;
• providing a set of phases, each phase further comprising a subset of the set of inner stator windings, a subset of the set of outer stator windings, and a flux linkage surrounding the subset of the set of inner stator windings and the subset of outer stator windings;
• connecting directly in series:
• a first subset of outer stator windings of the set of outer stator windings of a first phase of the set of phases on a first side of a center axis of the double stator permanent magnet machine,
• a second subset of outer stator windings of the set of outer stator windings of the first phase on a second side of the center axis that is opposite to the first side,
• a first subset of inner stator windings of the set of inner stator windings of the first phase on the second side of the center axis and adjacent to the second subset of outer stator windings, and
• a second subset of inner stator windings of the set of inner stator windings of the first phase on the first side of the center axis and adjacent the first subset of outer stator windings;
• and,
• selectively energizing the set of phases with a current.

A double stator permanent magnet machine, comprising:

• an inner stator, further comprising a back iron, a set of inner stator poles connected to the back iron, and a first shaft;
• a rotor, further comprising an outer cage and a second shaft connected to the outer cage, rotatively coupled to the inner stator;
• wherein the first shaft is fixed with respect to the back iron;
• wherein the first shaft has a collinear axis with the second shaft;
• wherein the second shaft is rotatable about the collinear axis;
• a set of segments, each segment further comprising a permanent magnet, connected to the outer cage;
• a first segment of the set of segments including a first permanent magnet with a polarity that is substantially tangential to a direction of motion the rotor;
• an outer stator, having an end portion, further comprising a set of outer stator poles, rotatively coupled to the rotor;
• wherein the end portion is rotationally coupled with the rotor and is adapted for connecting a load to the second shaft of the rotor;
• a set of inner stator windings disposed between each of the inner stator poles;
• a set of outer stator windings disposed between each of the outer stator poles;
• a set of phases, each phase further comprising a subset of the set of inner stator windings and a subset of the set of outer stator windings;
• and,
• whereby, when a current is selectively connected to the set of phases, one or more substantially axial flux paths are generated, the rotor rotates with respect to the inner stator and the outer stator, a reluctance torque is produced by the rotor, and a reaction torque is produced by the rotor at a ratio of at least 1:3.