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This document discusses, among other things, a stator with transposition between the windings or coils. The coils are free from transposition to increase the fill factor of the stator slots. The transposition at the end connections between an inner coil and an outer coil provide transposition to red

This document discusses, among other things, a stator with transposition between the windings or coils. The coils are free from transposition to increase the fill factor of the stator slots. The transposition at the end connections between an inner coil and an outer coil provide transposition to reduce circulating current loss. The increased fill factor reduces further current losses. Such a stator is used in a dual rotor, permanent magnet machine, for example, in a compressor pump, wind turbine gearbox, wind turbine rotor.

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We claim: 1. A permanent magnet machine, comprising: at least one permanent magnet rotor comprising an inner rotor component and an outer rotor component; at least one stator positioned between the inner rotor component and the outer rotor component, the stator comprising inner slots adjacent the i

We claim: 1. A permanent magnet machine, comprising: at least one permanent magnet rotor comprising an inner rotor component and an outer rotor component; at least one stator positioned between the inner rotor component and the outer rotor component, the stator comprising inner slots adjacent the inner rotor component and outer slots adjacent the outer rotor component; a plurality of polyphase inner windings associated with the inner slots, wherein at least one inner winding includes a first inner strand and a second inner strand, wherein the first inner strand is closer to the inner rotor component than the second inner strand, a plurality of polyphase outer windings associated with the outer slots, wherein at least one outer winding includes a first outer strand and a second outer strand, wherein the first outer strand is closer to the outer rotor component than the second outer strand, wherein the first inner strand is connected to the second outer strand at a first connection, and wherein the second inner strand is connected to the first outer strand at a second connection, and wherein the first and second connections provide transposition between the at least one inner winding and the at least one outer winding. 2. The machine of claim 1, wherein the first outer strand and the second outer strand are each a flat bar radially outwardly stacked on each other. 3. The machine of claim 1, wherein the first inner strand and the second inner strand are each a flat bar radially outwardly stacked on each other. 4. The machine of claim 1, wherein at least one of the first inner strand, the second inner strand, first outer strand, the second outer strand comprise copper. 5. A permanent magnet machine, comprising: at least one permanent magnet rotor comprising an inner rotor component and an outer rotor component; at least one stator positioned between the inner rotor component and the outer rotor component, the stator comprising a core, a plurality of inner windings, and a plurality of outer windings, wherein at least one inner winding includes a first inner strand adjacent the inner rotor component and a second inner strand adjacent the first inner strand, and wherein at least one outer winding includes a first outer strand adjacent the outer rotor component and a second outer strand adjacent the first outer strand, and wherein the first inner strand is connected to the second outer strand at a first connection, and wherein the second inner strand is connected to the first outer strand at a second connection, and wherein the first connection and the second connection provide transposition to reduce circulating currents in the stator. 6. The machine of claim 5, wherein both the inner windings and the outer windings comprise stacked bars. 7. The machine of claim 6,wherein the stator includes inner slots that are completely filled by the inner, stacked bar winding, and wherein the stator includes outer slots that are completely filled by the outer, stacked bar winding. 8. A stator for a permanent magnet generator, comprising: a core with a generally hollow cylindrical shape having a central inner opening; a plurality of inner windings adjacent the central inner opening, at least one of the inner windings including a first strand and a second strand stacked on the first strand, the first strand being closer to the inner opening than the second strand at the innermost turn of the inner winding; a plurality of outer windings radially outwardly of the inner windings, at least one of the outer windings including a third strand and a fourth strand stacked on the third strand, the fourth strand being outward of the third strand at an outermost turn of the outer winding, the fourth strand being connected to the second strand at a first connection, and the third stand being connected to the first strand at a second connection, wherein the first connection and the second connection provide transposition between the a first coil and a second coil. 9. The stator of claim 8, wherein the third strand and the fourth strand are each a flat bar radially outwardly stacked on each other. 10. The stator of claim 8, wherein the first strand and the second strand are each a flat bar radially outwardly stacked on each other. 11. The stator of claim 8, wherein at least one of the first strand, the second strand, the third outer strand, and the fourth strand comprise copper. 12. The stator of claim 8, wherein the inner windings further include inner windings of a first phase connected together. 13. The stator of claim 12, wherein the outer windings further include outer windings of a first phase connected together. 14. The stator of claim 8, wherein the first coil includes a first strand, a second strand, and a third strand, each separated by an insulator, the first strand being proximal a rotor, the second strand being intermediate the first strand and the third strand, the third strand being distal a rotor, and wherein the second coil includes a fourth strand, a fifth strand and a sixth strand, each separated by an insulator, the fourth strand being proximal a rotor, the fifth strand being intermediate the fourth strand and the sixth strand, the sixth strand being distal a rotor. 15. The stator of claim 14, wherein the first strand is connected to the sixth stand, wherein the second strand is connected to the fourth strand, and wherein the third strand is connected to the fifth strand. 16. The stator of claim 8, wherein the first coil includes a first strand and a second strand, the first strand being proximal a rotor and the second strand being distal a rotor, and wherein the second coil includes a third strand and a fourth strand coil, the third strand being proximal a rotor and connected to the second strand, and the fourth strand being distal a rotor and connected to the first strand.