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US 10,707,713 B2Granted
Balanced hairpin winding electric machine
AssigneeFord Global Technologies, LLC
InventorsFeng Liang, Franco Leonardi, Becky Sue Morris, Michael W. Degner
Life of this patent
Estimating the term…
Abstract
An electric machine includes a stator core defining slots having radial layers that each include adjacent first and second pin positions. Pins are disposed in corresponding ones of the slots and are interconnected to form a winding path. The path occupies the first and second positions of each layer, and, for each of the corresponding slots, the pins are in a same layer.
Claims17
An electric machine comprising:
- a stator defining slots grouped into poles;
- and
- a plurality of hairpins interconnected with select ones of the hairpins to form a plurality of winding paths corresponding to one of three phases of the electric machine and being configured to carry a same amount current, wherein each of the paths is disposed in corresponding ones of the slots, wherein the slots include radial layers of the hairpins that each have at least radially adjacent inner and outer hairpins positions, and, for each of the poles, each of the paths occupies the inner and outer hairpin positions of each of the layers once, and wherein the hairpins include a regular hairpin spanning nine slots, a short-pitch hairpin spanning eight slots, and a carryover hairpin spanning eleven slots.
An electric machine comprising:
- a stator core defining slots having radial layers that each include radially adjacent first and second pin positions;
- and
- pins disposed in corresponding ones of the slots and interconnected to form a winding path, wherein the path occupies the first and second positions of each of the layers, and, for each of the corresponding slots, the pins are in a same layer, wherein the pins include a first type of pin having a first leg disposed in a first one of the corresponding slots and a second leg disposed in a second one of the corresponding slots that is spaced apart from the first one by a first span of slots, and a second type of pin having a first leg disposed in a third one of the corresponding slots and a second leg disposed in a fourth one of the corresponding slots that is spaced apart from the first one by a second span of slots that is less than the first span, wherein the first and second legs of the first type are disposed in a same layer, and the first and second legs of the second type are disposed in different layers.
A stator for an electric machine comprising:
- a stator core defining slots circumferentially arranged and extending radially outward from an inner diameter of the core;
- and
- a plurality of hairpins interconnected with select ones of the hairpins and disposed in corresponding ones of the slots to form a plurality of winding paths each corresponding to one of three phases of the electric machine and configured to pass a same amount of current therethrough, wherein the slots include radial layers of the hairpins that each have at least radially adjacent outer and inner hairpins positions, and wherein each of the paths occupies the outer and inner positions of each layer of the corresponding ones of the slots, and, for each of the corresponding slots, the hairpins are in a same layer, and wherein each of the paths occupy all of the radial layers a same number of the times, wherein the hairpins include at least first, second, and third types of hairpins, and the first type of hairpins has a span of nine slots, the second type of hairpins has a span of eight slots, and the third type of hairpins has a span of eleven slots.
Dependencies are inferred from the claim text.