# US 10,312,769 B2 · Motor having air path of stator, or fan cleanable, and cleaning system of motor

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- Number: US 10,312,769 B2
- Document ID: US10312769B2
- Status: Granted
- Kind: B2
- Application number: 14/876,901
- Filed: 2015-10-07
- Published: 2016-04-14
- Granted: 2019-06-04
- Earliest claimed: 2014-10-10
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Yasuyuki Nakazawa
- Web page: https://patentgrep.com/patent/US10312769B2

## CPC

- H02K 9/04: having means for generating a flow of cooling medium
- H02K 5/207: {with openings in the casing specially adapted for ambient air}
- H02K 15/00: Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

Provided is a motor enabling more simple and efficient cleaning of the inside of an air path. The motor includes a stator, a housing which holds the stator, a fan arranged outside the stator, a fan cover which houses the fan and is mounted on the housing, an air path including an inlet and an outlet for a cooling gas, and a first cleaning hole extending from a first opening that faces and opens to the air path at a position closer to the outlet than the inlet to a second opening which opens to the outside.

## Claims

### Claim 1

A motor comprising:
a stator having a proximal end and a distal end;
a housing which holds the stator, the housing having a proximal end and a distal end;
a fan arranged outside the stator near the stator's distal end, the fan generating a cooling gas flow that flows in a direction from the proximal end of the stator to the distal end of the stator;
a fan cover mounted on the distal end of the housing so as to house the fan;
an air path provided at the stator or the housing, and including an inlet located at the proximal end of the stator or the housing and an outlet located at the distal end of the stator or the housing for the cooling gas flow, the air path having an air path axial centerline passing through the inlet and the outlet;
a first cleaning hole formed at the stator, the housing, or the fan cover, and extending axially from a first opening which faces the outlet at a position downstream of the cooling gas flow to a second opening which opens to an outside, the first cleaning hole including a portion extending axially from the first opening, the portion having a center line parallel to the air path axial centerline; and
a removable plug located in the first cleaning hole which can be removed in order to provide compressed air into the first cleaning hole to perform a cleaning operation.

### Claim 2 (depends on 1)

The motor according to claim 1, comprising:
a plurality of air paths; and
a plurality of first cleaning holes arranged to face the respective air paths.

### Claim 3 (depends on 1)

The motor according to claim 1, wherein the first opening is arranged at a position separated from the outlet so as to face the outlet.

### Claim 4 (depends on 1)

The motor according to claim 1, wherein an inner wall of the first cleaning hole is threaded.

### Claim 5 (depends on 1)

The motor according to claim 1, wherein the housing includes a hollow part extending between the stator and the fan cover, and having an inner space which is in fluid communication with the air path and the inside of the fan cover,
the first cleaning hole is formed at the hollow part.

### Claim 6 (depends on 1)

A cleaning system for cleaning the inside of the motor according to claim 1, comprising:
a fluid supply device which supplies a compressed fluid into the first cleaning hole; and
a controller which controls the fluid supply device.

### Claim 7 (depends on 1)

The motor according to claim 1, further comprising a second cleaning hole formed at the stator, the housing, or the fan cover, and extending from a third opening which opens to face the fan to a fourth opening which opens to the outside.

### Claim 8 (depends on 7)

The motor according to claim 7, wherein the second opening and the fourth opening are the same one opening,
the second cleaning hole extends from the third opening so as to be connected to the first cleaning hole.