# US 2024/0204584 A1 · Electric motor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2024/0204584 A1
- Document ID: US20240204584A1
- Status: Published application
- Kind: A1
- Application number: 18/540,920
- Filed: 2023-12-15
- Published: 2024-06-20
- Earliest claimed: 2022-12-19
- Assignees: Yamaha Hatsudoki Kabushiki Kaisha
- Applicants: Yamaha Hatsudoki Kabushiki Kaisha
- Inventors: Jin ITO
- Web page: https://patentgrep.com/patent/US20240204584A1

## CPC

- H02K 1/16: Stator cores with slots for windings
- H02K 1/165: {Shape, form or location of the slots}
- H02K 1/20: with channels or ducts for flow of cooling medium
- H02K 3/24: with channels or ducts for cooling medium between the conductors
- H02K 3/30: Windings characterised by the insulating material
- H02K 3/345: {between conductor and core, e.g. slot insulation}
- H02K 3/487: Slot-closing devices
- H02K 5/203: {specially adapted for liquids, e.g. cooling jackets}
- H02K 9/197: in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A resin portion of a stator includes a filling portion that is formed between two adjacent tooth portions and positioned closer to a rotor than a coil. Each of the plurality of tooth portions includes a facing surface, which is an end surface facing the rotor, a first protrusion that protrudes in the rotation direction and includes the facing surface, and a second protrusion that is positioned closer to the rotor than the coil. This structure enables to more reliably partition a channel of coolant for cooling the stator and a housing chamber that houses the rotor.

## Claims

### Claim 1

An electric motor comprising:
a motor body including a rotor and a stator, the rotor being rotatable around an axis;
a housing that houses the motor body;
a stator cooling channel that is defined inside the housing and is configured to be filled with coolant, and in which the stator is disposed; and
a rotor housing chamber that is defined in the housing, and in which the rotor is disposed,
wherein
the stator includes a stator core, a resin portion, and a coil,
the stator core includes a plurality of tooth portions arranged in a rotation direction, electric wires of the coil being disposed in two adjacent tooth portions,
the resin portion includes a filling portion that is formed between the two adjacent tooth portions and positioned closer to the rotor than the electric wires of the coil, and
each of the plurality of tooth portions includes a facing surface, which is an end surface facing the rotor, each of the plurality of tooth portions includes a first protrusion and a second protrusion, the first protrusion protruding in the rotation direction and forming the facing surface, and the second protrusion being positioned closer to the rotor than the electric wires of the coil.

### Claim 2 (depends on 1)

The electric motor according to claim 1, wherein
the second protrusion protrudes from the first protrusion in a radial direction.

### Claim 3 (depends on 1)

The electric motor according to claim 1, wherein
the second protrusion protrudes from the tooth portion in the rotation direction.

### Claim 4 (depends on 1)

The electric motor according to claim 1, wherein
a slot is formed between two adjacent tooth portions, the electric wires of the coil is disposed within the slot, and
the resin portion includes a portion that is formed between an inner surface of the slot and the electric wires of the coil.

### Claim 5 (depends on 1)

The electric motor according to claim 1, wherein
a slot is formed between two adjacent tooth portions, and
the stator includes an insulating sheet that is disposed between an inner surface of the slot and the electric wires of the coil.

### Claim 6 (depends on 1)

The electric motor according to claim 1, wherein
a gap is formed between the electric wire of the coil and a side surface of the tooth portion, and
the second protrusion has a greater protrusion amount than the gap.