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US 11,081,922 B2Granted
Hairpin winding electric machine
AssigneeFord Global Technologies, LLC
InventorsAdeeb Ahmed, Jacob Krizan
Life of this patent
Estimating the term…
Abstract
An electric machine includes a stator core defining circumferentially-arranged slots each having radial pin positions arranged to define radial layers and a hairpin winding including a first path of interconnected hairpins disposed in the stator core. The hairpins are arranged such that a leg portion of each hairpin is routed through a radial pin position of each slot wherein at least one uniquely-pitched hairpin is provided along the first path to induce a first shift in a trailing portion of the first path.
Claims19
An electric machine comprising:
- a stator core defining circumferentially-arranged slots each having radial pin positions arranged to define radial layers;
- and
- a hairpin winding including a first path of interconnected regular hairpins disposed in the stator core such that a leg portion of each regular hairpin is routed through a radial pin position of each of the slots, wherein each of the regular hairpins has a regular pitch defined by a crown pitch span and two twist pitch spans having same value, wherein at least one uniquely-pitched hairpin is provided along the first path to induce a first shift in a trailing portion of the first path, and wherein the at least one uniquely-pitched hairpin has a unique pitch defined by the crown pitch span, one of the twist pitch spans, and a shorter other twist pitch span having a value less than the same value.
An electric machine comprising:
- a stator core defining circumferentially-arranged slots, each slot having radial pin positions arranged in adjacent pairs to define radial layers;
- and
- a first electrical phase of a hairpin winding including a plurality of first hairpins interconnected to each other in series around two inner radial layers, and a plurality of second hairpins interconnected to each other in series around two outer radial layers, the second hairpins being connected at a leading edge to the first hairpins via a uniquely-pitched hairpin, wherein the uniquely-pitched hairpin has a unique pitch defined by a crown pitch span, a first twist pitch span, and a second twist pitch span shorter than the first twist pitch span.
An electric machine comprising:
- a stator core defining circumferentially-arranged slots, each slot having radial pin positions arranged in adjacent pairs to define radial layers;
- a first phase of a hairpin winding having a plurality of first hairpins interconnected to each other in series and positioned in at least one inner radial layer, and a plurality of second hairpins interconnected to each other in series and connected to a trailing edge of the first hairpins by a first unique-pitched hairpin and positioned in at least one outer radial layer, wherein the first uniquely-pitched hairpin has a unique pitch defined by a crown pitch span, a first twist pitch span, and a second twist pitch span shorter than the first twist pitch span;
- a second phase of the hairpin winding having a plurality of third hairpins interconnected to each other in series and positioned in at least one inner radial layer, and a plurality of fourth hairpins interconnected to each other in series and connected to a trailing edge of the third hairpins by a second unique-pitched hairpin and positioned in at least one outer radial layer;
- a third phase of the hairpin winding having a plurality of fifth hairpins interconnected to each other in series and positioned in at least one inner radial layer, and a plurality of sixth hairpins interconnected to each other in series and connected to a trailing edge of the fifth hairpins by a third unique-pitched hairpin and positioned in at least one outer radial layer, wherein each of the first phase, the second phase, and the third phase are interleaved such that a plurality of the slots include a hairpin leg portion from both the first and second electrical phases within in a single slot.
1 more element
Dependencies are inferred from the claim text.