Hairpin wire motor stator

A hairpin wire motor stator comprising:

• a ring-shaped stator core defining a rotor accommodation space at a center of the stator core, wherein the stator core comprises an insertion side and an extension side allowing a plurality of hairpin wires to be inserted from the insertion side and protruded out from the extension side;
• a plurality of slot-positions disposed on the stator core and surrounding the rotor accommodation space circumferentially, the slot-positions forming a plurality of radially-adjacent slot-position layers, the stator core comprising a plurality of polar regions, each polar region comprising a plurality of phases, each phase comprising a plurality of phase slots, the phase slots being disposed circumferentially adjacent and comprising at least a leftmost phase slot and a rightmost phase slot, each phase slot comprising the slot-positions that are radially-adjacent;
• the hairpin wires configured to be disposed into the slot-positions of the phase slots of the same phases of the polar regions, the hairpin wires being connected to form a plurality of windings, each winding is routed through immediately-adjacent two of the slot-position layers at the insertion side and the extension side, and configured to be:
• at the extension side, routed through the same phases of all the polar regions by a span of a pole pitch;
• at the insertion side, routed through a first phase slot and a second phase slot of the same phases of all the polar regions, wherein the second phase slot is immediately-adjacent to a third phase slot that is spaced from the first phase slot by a pole pitch,
• wherein the hairpin wires comprise a plurality of transpolar hairpin wires, all hairpin wires that are routed through the same the transpolar immediately-radially-adjacent two of the slot-position layers have a same span at the insertion side;
• and
• at least a trans-layer connection wire connected between two of the windings that are routed through different immediately-radially-adjacent two of the slot-position layers, each winding comprises all the transpolar hairpin wires that are routed through the same immediately-radially-adjacent two of the slot-position layers, and each winding has two ends disposed into the leftmost phase slot and the rightmost phase slot of the phase slots of the same phases across the polar regions, wherein the trans-layer connection wire has two ends disposed into the leftmost phase slot and the rightmost phase slot of the phase slots of the same phases across the polar regions.

A hairpin wire motor stator comprising:

• a ring-shaped stator core comprising a first side and an opposite second side, wherein the first side is an insertion side of the stator core;
• a plurality of slot-positions disposed on the stator core allowing a plurality of hairpin wires to be configured through, the slot-positions disposed on the stator core in a circumferential direction to form adjacent slots and a plurality of radially-adjacent slot-position layers, the stator core comprising a plurality of polar regions, each polar region comprising a group of the slot-positions, each polar region comprising a plurality of phases, each phase comprising a plurality of phase slots, the phase slots being disposed circumferentially adjacent and comprising at least a leftmost phase slot and a rightmost phase slot;
• a plurality of windings, each winding composed of the hairpin wires connected and disposed across the polar regions, wherein all the connected hairpin wires are disposed across immediately-adjacent two of the slot-position layers, and have a span, in the circumferential direction at the first side, equal to:
• a pole pitch plus an adjacent slot;
• or
• a pole pitch minus an adjacent slot;
• or
• a combination of a pole pitch plus an adjacent slot and a pole pitch minus an adjacent slot,
• wherein the hairpin wires comprise a plurality of transpolar hairpin wires, all the transpolar hairpin wires that are routed through the same immediately-radially-adjacent two of the slot-position layers have a same span at the insertion side;
• and
• at least a trans-layer connection wire connected between two of the windings that are routed through different immediately-radially-adjacent two of the slot-position layers, each winding comprises all the transpolar hairpin wires that are routed through the same immediately-radially-adjacent two of the slot-position layers, and each winding has two ends disposed into the leftmost phase slot and the rightmost phase slot of the phase slots of the same phases across the polar regions, wherein the trans-layer connection wire has two ends disposed into the leftmost phase slot and the rightmost phase slot of the phase slots of the same phases across the polar regions.