| CPC H02K 1/16 (2013.01) [H02K 3/12 (2013.01); H02K 3/28 (2013.01); H02K 15/0428 (2013.01)] | 11 Claims |
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1. A stator comprising:
a stator core having a plurality of slots formed in a circumferential direction;
a plurality of coil bundles respectively inserted into each of the plurality of slots;
a plurality of connection coils each having one side joined to one of the plurality of coil bundles, and the other side joined to another of the plurality of coil bundles; and
a plurality of layers being respectively formed in each of the plurality of slots in a radial direction of the stator core,
wherein the plurality of coil bundles each comprises a plurality of hairpins each comprising a crown portion protruding toward one side in an axial direction of the stator core, and a leg portion protruding toward the other side in the axial direction, and
wherein at least one connection coil of the plurality of connection coil comprises:
a first extension region extending in a first direction;
a second extension region extending in a second direction and having one end portion connected to one end portion of the first extension region;
a first joint region connected to the other end portion of the first extension region and joined to the leg portion extended from a hairpin of the plurality of hairpins; and
a second joint region connected to the other end portion of the second extension region and joined to the leg portion extended from another hairpin of the plurality of hairpins, and
wherein the first extension region and the first joint region have a shape symmetric to the second extension region and the second joint region,
wherein the plurality of coil bundles is supplied with three-phase-current,
wherein the plurality of coil bundles comprises:
a first coil bundle configured to be supplied with U-phase current of the three-phase current;
a second coil bundle configured to be supplied with V-base current of the three-phase current; and
a third coil bundle configured to be supplied with W-phase current of the three-phase current, and
wherein the connection coils comprise:
a first connection coil joined to the plurality of hairpins provided in the first coil bundle;
a second connection coil joined to the plurality of hairpins provided in the secondi coil bundle; and
a third connection coil joined to the plurality of hairpins in the third coil bundle,
wherein at least one of the connection coils are respectively joined to the two hairpins provided in an outermost or innermost layer of the plurality of hairpins in the radial direction,
wherein the first coil bundle comprises a first-parallel coil comprising an extension line and a neutral line disposed at one end portion and the other end portion thereof, and the neutral line of the first-first parallel coil is disposed adjacent to the outermost or innermost layer in the radial direction
wherein the first coil bundle further comprises a first second parallel coil comprising an extension line and a neutral line disposed at one end portion and the other end portion thereof, and the neutral line of the first-second parallel coil is disposed adjacent to the outermost or innermost layer in the radial direction,
wherein the stator core has forty-eight slots in the circumferential direction, and live layers are disposed in each of the slots in the radial direction, and
wherein the first-first parallel coil and the first-second parallel coil are respectively inserted into the slots to have a combination of five slot pitches, six slot pitches, and seven slot pitches.
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