Electric machine
A multi-phase electric machine includes a stator core defining slots and hairpins coils disposed of in the slots and selectively joined at connections to form windings is provided. The present invention also includes a round-wide double-layer distributed winding arrangement for the multi-phase machine. The winding arrangements are winding with non-integer slots per pole per phase.
1. A multi-phase electric machine, comprising;
a stator core; and
a rotor disposed within the stator core; the rotor having poles thereon; the stator core including non-integer slots being circumferentially arranged around the rotor; a plurality of windings disposed in the stator core; wherein the windings are arranged with the non-integer slots per pole per phase thereby reducing third harmonics of a back-EMF substantially to zero;
wherein a winding factor distribution of the third harmonic is a zero.
2. The multi-phase electric machine according to claim 1 , wherein the electric machine further comprises five phases.
3. The multi-phase electric machine according to claim 1 , wherein the windings have a fractional coil pitch.
4. The multi-phase electric machine according to claim 3 , wherein the electric machine has five phases.
5. The multi-phase electric machine according to claim 1 , wherein the windings further comprise a round-wide double-layer winding arrangement.
6. The multi-phase electric machine according to claim 5 , wherein the electric machine has five phases.
7. The multi-phase electric machine according to claim 1 , wherein the windings further comprise a hairpin winding arrangement.
8. The multi-phase electric machine according to claim 7 , wherein the electric machine has five phases.
9. The multi-phase electric machine according to claim 1 , wherein the rotor is selected from a group comprising one of a surface mount type, a W-type, a delta-type multi-layer, a V-type, interior type and a U-type.
10. A multi-phase electric machine, comprising;
a stator core having at least non-integer slots being circumferentially arranged around a rotor having a plurality of poles; a plurality of windings disposed in the stator core; wherein the windings are arranged with the non-integer slots per pole per phase thereby reducing third harmonics of a back-EMF substantially to zero; wherein a winding factor distribution of the third harmonic is a zero.
11. The multi-phase electric machine according to claim 10 , wherein the electric machine further comprises five phases.
12. The multi-phase electric machine according to claim 10 , wherein the windings have a fractional coil pitch.
13. The multi-phase electric machine according to claim 10 , wherein the windings further comprise a round-wide double-layer winding arrangement.
14. The multi-phase electric machine according to claim 10 , wherein the windings further comprise a hairpin winding arrangement.
15. The multi-phase electric machine according to claim 10 , wherein the rotor is selected from a group comprising one of a surface mount type, a W-type, a delta-type multi-layer, a V-type, interior type and a U-type.