# US 2021/0344244 A1 · Stator, rotary electric machine, and work machine

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- Number: US 2021/0344244 A1
- Document ID: US20210344244A1
- Status: Published application
- Kind: A1
- Application number: 17/274,516
- Filed: 2019-08-16
- Published: 2021-11-04
- Earliest claimed: 2018-09-25
- Assignees: Komatsu Ltd.
- Applicants: Komatsu Ltd.
- Inventors: Atsuyoshi KOSHIBA; Takaaki KIMURA; Kousuke MIKAMI; Teiichirou CHIBA
- Web page: https://patentgrep.com/patent/US20210344244A1

## CPC

- H02K 3/28: Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32)
- H02K 15/0421: and consisting of single conductors, e.g. hairpins
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A stator includes a stator core (6); and a coil wound around the stator core. The coil includes a basic coil segment (22) including a pair of first legs (31) and a first transition portion (32) disposed on a first end surface (14) side of the stator core, and a transition coil segment (23) including a pair of second legs (41) and a second transition portion (42). The second transition portion includes a pair of shoulders (43) and a pair of second rising portions (44). An inclination angle of the second rising portion is larger than an angle of the shoulder with respect to a first end surface, so that the second transition portion is in contact with the first transition portion.

## Claims

### Claim 1

A stator comprising:
a stator core including a plurality of teeth and a plurality of slots; and
a coil wound around the plurality of slots at a predetermined pitch,
wherein the coil includes
a basic coil segment including a pair of first legs that are inserted into a pair of first slots located apart from each other by a first interval in a circumferential direction of the stator core, and a first transition portion that connects the pair of first legs and is disposed on a side of a first end surface in an axial direction of the stator core, and
a transition coil segment including a pair of second legs that are inserted into a pair of second slots located apart from each other in the circumferential direction by a second interval wider than the first interval, and a second transition portion that connects the pair of second legs and is disposed such that the first transition portion is located between the second transition portion and the first end surface in the axial direction,
the first transition portion of the basic coil segment includes a pair of first rising portions that extend obliquely to be apart from the first end surface in the axial direction while the pair of first rising portions approach each other from the first legs in the circumferential direction,
the second transition portion of the transition coil segment includes a pair of shoulders that extend from the second legs in a direction to approach each other, and a pair of second rising portions that extend obliquely to be apart from the first end surface in the axial direction while the pair of second rising portions approach each other from tips in an extending direction of the shoulders, and
an inclination angle of the second rising portion with respect to the first end surface is larger than an angle of the shoulder with respect to the first end surface, so that the second transition portion is in contact with the first transition portion.

### Claim 2 (depends on 1)

The stator according to claim 1,
wherein the second transition portion includes a flat portion that connects tips in an extending direction of the pair of second rising portions and extends parallel to the first end surface of the stator core, and
the flat portion is in contact with tips in an extending direction of the first rising portions of a plurality of the basic coil segments.

### Claim 3 (depends on 1)

The stator according to claim 1,
wherein the second rising portion of the second transition portion is in parallel contact with the first rising portion of the first transition portion.

### Claim 4 (depends on 1)

The stator according to claim 1,
wherein the plurality of slots each have a plurality of layers arranged in a radial direction of the stator core,
one first leg or one second leg is inserted into each of the layers,
the pair of first legs of the basic coil segment are inserted into two layers adjacent to each other in the radial direction, and
the pair of second legs of the transition coil segment are inserted into two layers located apart from each other by two or more layers in the radial direction.

### Claim 5 (depends on 1)

A rotary electric machine comprising:
a rotor; and
the stator according to claim 1, the stator accommodating the rotor.

### Claim 6 (depends on 5)

A work machine comprising:
the rotary electric machine according to claim 5.