# US 2021/0242745 A1 · Canned electric motor

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- Number: US 2021/0242745 A1
- Document ID: US20210242745A1
- Status: Published application
- Kind: A1
- Application number: 16/972,616
- Filed: 2018-06-08
- Published: 2021-08-05
- Earliest claimed: 2018-06-08
- Assignees: Pierburg Pump Technology GmbH
- Applicants: Pierburg Pump Technology GmbH
- Inventors: JAN HOHMANN; MARTIN HELMIS; ANDREAS SAUER; ANDREAS LOEKES
- Web page: https://patentgrep.com/patent/US20210242745A1

## CPC

- H02K 5/128: using air-gap sleeves or air-gap discs
- F04D 13/0626: {Details of the can}
- H02K 5/124: Sealing of shafts
- H02K 5/16: Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields (magnetic bearings H02K7/09)
- H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A canned electric motor for a fluid pump. The canned electric motor includes a static motor frame, a rotor shaft, a rotatable motor rotor which is co-rotatably connected with the rotor shaft, a static motor stator having a stator body which is directly fixed to the static motor frame, and a separating can which fluidically separates the static motor stator from the rotatable motor rotor. The separating can has a first axial support which protrudes radially from an outside of the separating can. The separating can is supported in a first axial direction by the stator body via the first axial support and in a second axial direction by the static motor frame. The first axial direction is opposite to the second axial direction.

## Claims

### Claim at position 1

1-8. (canceled)

### Claim 9

A canned electric motor for a fluid pump, the canned electric motor comprising:
a static motor frame;
a rotor shaft;
a rotatable motor rotor which is co-rotatably connected with the rotor shaft;
a static motor stator comprising a stator body, the stator body being directly fixed to the static motor frame; and
a separating can which is configured to fluidically separate the static motor stator from the rotatable motor rotor, the separating can comprising a first axial support which is arranged to protrude radially from an outside of the separating can, the separating can being supported in a first axial direction by the stator body via the first axial support and in a second axial direction by the static motor frame, the first axial direction being opposite to the second axial direction.

### Claim 10 (depends on 9)

The canned electric motor as recited in claim 9, wherein the separating can is made of a thermosetting plastic.

### Claim 11 (depends on 9)

The canned electric motor as recited in claim 9, wherein,
the separating can further comprises a second axial support,
the separating can is unilaterally supported via the first axial support in the first axial direction, and
the separating can is unilaterally supported in the second axial direction via the second axial support.

### Claim 12 (depends on 9)

The canned electric motor as recited in claim 9, wherein the static motor frame comprises a separating can reception ring which protrudes axially from the static motor frame and which is configured to radially support and position the separating can.

### Claim 13 (depends on 12)

The canned electric motor as recited in claim 12, wherein,
the separating can reception ring comprises at least one positioning recess, and
the separating can further comprises at least one positioning nose which corresponds to the at least one positioning recess, the at least one positioning nose being configured to radially protrude from the first axial support and to engage into the at least one positioning recess so as to rotationally position the separating can with respect to the static motor frame.

### Claim 14 (depends on 9)

The canned electric motor as recited in claim 9, further comprising:
a seal ring which is configured to fluidically seal a gap between the separating can and the static motor frame,
wherein,
the separating can further comprises a seal support ring which is arranged to surround the separating can and which is configured to axially support the seal ring.

### Claim 15 (depends on 9)

The canned electric motor as recited in claim 9, wherein the first axial support comprises a plurality of support teeth which are distributed merlon-like along a circumference of the separating can.

### Claim 16 (depends on 9)

The canned electric motor as recited in claim 9, further comprising:
a rotor shaft bearing which is configured to support the rotor shaft,
wherein,
the separating can further comprises a rotor shaft reception which is only supported by the separating can, the rotor shaft reception being configured to receive and to support the rotor shaft bearing.