# US 11,121,601 B2 · Stator attachment mechanism

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- Number: US 11,121,601 B2
- Document ID: US11121601B2
- Status: Granted
- Kind: B2
- Application number: 16/365,238
- Filed: 2019-03-26
- Published: 2020-10-01
- Granted: 2021-09-14
- Earliest claimed: 2019-03-26
- Assignees: Ford Global Technologies, LLC
- Applicants: Ford Global Technologies, LLC
- Inventors: Bradley Ronald Heuver
- Web page: https://patentgrep.com/patent/US11121601B2

## CPC

- H02K 1/185: {to outer stators}
- H02K 5/22: Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- Y02T 10/64: Electric machine technologies in electromobility
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A stator system for an electric vehicle motor may include a stator forming a back iron and a plurality of teeth extending inwardly therefrom, the stator including a plurality of attachment points protruding radially outwardly from the back iron, and a case configured to house the stator and defining a plurality of case openings, each configured to receive one of the attachment points, wherein each attachment point defines at least one T-slot configured to receive a nut that cooperates with a bolt extending through the case to connect the case to the stator.

## Claims

### Claim 1

A stator system for an electric vehicle motor, comprising:
a stator forming a back iron and a plurality of teeth extending inwardly therefrom, the stator including a plurality of attachment points protruding radially outwardly from the back iron; and
a case configured to house the stator and defining a plurality of case openings, each configured to receive one of the attachment points, wherein each attachment point defines at least one T-slot having a proximal portion and a distal portion, the proximal portion having a larger dimension than the distal portion and configured to receive a nut that cooperates with a bolt extending through the case to connect the case to the stator.

### Claim 2 (depends on 1)

The system of claim 1, wherein the bolt and the nut provide a clamping force between each attachment point and the case.

### Claim 3 (depends on 2)

The system of claim 2, wherein the stator comprises a plurality of laminations.

### Claim 4 (depends on 1)

The system of claim 1, wherein the stator comprises four attachment points.

### Claim 5 (depends on 1)

The system of claim 1, wherein the attachment points are equidistantly spaced around the back iron.

### Claim 6 (depends on 1)

The system of claim 1, wherein the stator is formed of a plurality of stator laminations.

### Claim 7

A stator system for an electric vehicle, comprising:
a stator forming a back iron and a plurality of teeth extending inwardly therefrom,
at least one attachment point protruding radially outwardly from the back iron and configured to engage with a case;
the attachment point defining at least one slot configured to receive a nut that cooperates with a bolt to connect the case to the stator, wherein the at least one slot is a T-slot having a proximal portion and a distal portion, the proximal portion having a larger dimension than the distal portion.

### Claim 8 (depends on 7)

The system of claim 7, wherein the T-slot is configured to receive the nut within the proximal portion and abut the distal portion, the nut and bolt configured to apply a clamping force to the attachment point and the case to affix the case to the stator.

### Claim 9 (depends on 8)

The system of claim 8, wherein the bolt includes a bolt head configured to abut an outer periphery of the case and cause the case to engage with the stator as the bolt is tightened.

### Claim 10 (depends on 7)

The system of claim 7, wherein the stator comprises four attachment points.

### Claim 11 (depends on 7)

The system of claim 7, wherein the at least one attachment point includes a plurality of attachment points equidistantly spaced around the back iron.

### Claim 12

A stator attachment mechanism, comprising:
at least one bolt ear protruding radially outwardly from a back iron of a stator and configured to engage with a case, the bolt ear defining at least one T-slot configured to maintain a nut in a proximal portion of the T-slot, the nut configured to receive a bolt extending through the case and through a distal portion of the T-slot wherein the bolt tightens to the nut to fix the case to the stator.

### Claim 13 (depends on 12)

The mechanism of claim 12, wherein the proximal portion has a larger dimension than the distal portion.

### Claim 14 (depends on 12)

The mechanism of claim 12, wherein the bolt includes a bolt head configured to abut an outer periphery of the case and cause the case to engage with the stator during the tightening to the nut.