Canned electric motor

Patent metadata

Field	Value
Publication number	US-11705772-B2
Application number	US-201816972616-A
Country	US
Kind code	B2
Filing date	Jun 8, 2018
Priority date	Jun 8, 2018
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

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.

First claim

What is claimed is:

1. A canned electric motor for a fluid pump, the canned electric motor comprising:
a static motor frame which extends substantially radially;
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,
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.

2. The canned electric motor as recited in claim 1 , wherein the separating can is made of a thermosetting plastic.

3. The canned electric motor as recited in claim 1 , 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.

4. The canned electric motor as recited in claim 1 , 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.

5. The canned electric motor as recited in claim 1 , wherein the first axial support comprises a plurality of support teeth which are distributed merlon-like along a circumference of the separating can.

6. The canned electric motor as recited in claim 1 , 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.

7. A canned electric motor for a fluid pump, the canned electric motor comprising:
a one-piece static motor frame which extends substantially radially;
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 one-piece 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 one-piece static motor frame, the first axial direction being opposite to the second axial direction.

8. A canned electric motor for a fluid pump, the canned electric motor comprising:
a static motor frame which extends substantially radially;
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;
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; and
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.

9. The canned electric motor as recited in claim 8 , 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.

10. The canned electric motor as recited in claim 8 , 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.

11. The canned electric motor as recited in claim 10 , 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.

12. The canned electric motor as recited in claim 8 , wherein the first axial support comprises a plurality of support teeth which are distributed merlon-like along a circumference of the separating can.

13. The canned electric motor as recited in claim 8 , 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.

14. A canned electric motor for a fluid pump, the canned electric motor comprising:
a static motor frame which extends substantially radially;
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;
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; and

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.

15. The canned electric motor as recited in claim 14 , 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.

16. The canned electric motor as recited in claim 15 , wherein,
the separating can reception ring compr

Assignees

• Pierburg Pump Technology Gmbh

Inventors

• Hohmann Jan
• Helmis Martin
• Sauer Andreas
• Loekes Andreas

Classifications

• H02K5/128 Primary

  using air-gap sleeves or air-gap discs · CPC title

• H02K5/124

  Sealing of shafts · CPC title

• H02K5/16

  Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields (magnetic bearings H02K7/09) · CPC title

• H02K7/14 Primary

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title

• F04D13/0626

  Details of the can · CPC title