# US 2018/0026491 A1 · Screwed stator frame for an electric motor and associated manufacturing process

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- Number: US 2018/0026491 A1
- Document ID: US20180026491A1
- Status: Published application
- Kind: A1
- Application number: 15/655,313
- Filed: 2017-07-20
- Published: 2018-01-25
- Earliest claimed: 2016-07-22
- Assignees: Alstom Transport Technologies
- Applicants: Alstom Transport Technologies
- Inventors: Bruno RAGUIN; Jean-Pierre LOMBARD; Gaëtan TRIMAILLE
- Web page: https://patentgrep.com/patent/US20180026491A1

## CPC

- H02K 5/06: Cast metal casings
- H02K 1/185: {to outer stators}
- H02K 5/04: Casings or enclosures characterised by the shape, form or construction thereof
- H02K 5/15: Mounting arrangements for bearing-shields or end plates
- H02K 15/14: Casings; Enclosures; Supports
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A motor stator frame including two plates in cast iron; at least one steel bar connecting both plates, each bar having two threaded ends; and at least one threaded bushing. Where each of the plates has at least one orifice being used as a seat for each threaded bushing the threaded ends of each bar being engaged into the threaded bushings.

## Claims

### Claim 1

A motor stator frame comprising:
two plates in cast iron;
at least one steel bar connecting both plates, each bar having two threaded ends; and
at least one threaded bushing,
wherein each of the plates comprises at least one orifice being used as a seat for each threaded bushing, the threaded ends of each bar being engaged into the threaded bushings.

### Claim 2 (depends on 1)

The frame according to claim 1, wherein each orifice of each plate in cast iron is a through-orifice and opens onto an inner face and an outer face of the plate.

### Claim 3 (depends on 2)

The frame according to claim 2, wherein each orifice includes an inner segment opening onto the inner face of the plate and an outer segment opening onto the outer face of the plate, the inner segment having a diameter of less than the diameter of the outer segment, and the threaded bushing engaged into the orifice having a complementary shoulder of the orifice.

### Claim 4 (depends on 1)

The frame according to claim 1, wherein each threaded bushing is flushed with an outer face of the plate including the orifice.

### Claim 5 (depends on 4)

The frame according to claim 4, wherein each end of each bar is flushed with the outer face.

### Claim 6 (depends on 1)

The frame according to claim 1, wherein each end of each bar has a threaded orifice receiving a screw for attaching an end flange.

### Claim 7 (depends on 1)

A method for manufacturing a frame according to claim 1, comprising the following steps:
providing two plates in cast iron, having at least one orifice;
providing at least one steel bar having two threaded ends;
providing threaded bushings;
inserting one of the threaded bushings in each orifice of each plate; and
screwing each threaded end of each bar into one of the threaded bushings placed in one of the orifices of one of the plates.

### Claim 8 (depends on 7)

The manufacturing method according to claim 7, comprising a step of piercing the outer face of each plate in order to form an outer segment at each orifice, said outer conduit being able to cooperate with a shoulder of each threaded bushing maintaining said threaded bushing in place.

### Claim 9 (depends on 8)

The manufacturing method according to claim 8, comprising a step for leveling a tightening head of each threaded bushing in order to make the threaded bushing and the end of the bar flush with the outer face of the plate.

### Claim 10 (depends on 9)

The manufacturing method according to claim 9, comprising a step of piercing a threaded orifice receiving a screw for attaching an end flange in each end of at least one bar.