Combined UHV insulation system

Patent metadata

Field	Value
Publication number	US-11394283-B2
Application number	US-202016867745-A
Country	US
Kind code	B2
Filing date	May 6, 2020
Priority date	May 14, 2019
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

Abstract

A stator unit of an electric motor for driving a hermetic compressor including a stator core and a coil separator cage, which is inserted into the stator core and includes a substantially annular disc-shaped base part and elongated separating webs distributed over the circumference of the base part, with their longitudinal axes extending in the axial direction relative to the stator core, wherein the annular disc-shaped base part is fastened to a first end face of the stator core, and a separating web engages in each stator slot, such that one of the separating webs is arranged between two adjacent coils, wherein each gap between the coil separator cage and the coil windings is filled with an insulating filler.

First claim

What is claimed is:

1. A stator unit of an electric motor for driving a hermetic compressor, comprising:
a stator core with a substantially hollow-cylindrical stator yoke, an inside of the stator core has coil webs evenly distributed over a circumference of the stator core and the coil webs are directed radially inward in relation to a cross-section of the stator core, wherein stator slots are formed between adjacent ones of the coil webs in a circumferential direction, and lead wires are wound around the coil webs to form coils; and
a coil separator cage, inserted into the stator core, the coil separator cage further comprising a substantially annular disc-shaped base part and elongated separating webs distributed over a circumference of the annular disc-shaped base part, and longitudinal axes of the elongated separating webs extending in an axial direction relative to the stator core, a cross-section of each of the elongated separating webs respectively corresponding to a shape of one of a plurality of recesses in the annular disc-shaped base part and which, together with a corresponding the one of the recesses, form axial channels over an entire length of the coil separator cage, wherein the annular disc-shaped base part is fastened to a first end face of the stator core and each of the elongated separating webs engages in each of the stator slots, such that one of the elongated separating webs is arranged between two adjacent ones of the coils, wherein a gap between each of the coil separator cage and windings of the coils is filled with an insulating filler material, whereas the axial channels remain free for cooling, wherein the stator unit further comprises an inner closing ring, attached to the coil separator cage in an area of a second end face of the stator core, which is situated opposite the first end face, such that end areas of the elongated separating webs opposite the annular disc-shaped base part abut with inward-directed sides against an outer wall of the inner closing ring and are distributed over a periphery thereof, whereby the gap between each of the coil separator cage, the coil windings and the inner closing ring is filled with the insulating filler material.

2. The stator unit according to claim 1 , wherein the elongated separating webs abut with a respective outward directed side against an inner wall of the stator yoke or a base insulation of the inner wall.

3. The stator unit according to claim 1 , wherein the insulating filler material is an adhesive or other binder.

4. The stator unit according to claim 1 , wherein the insulating filler material is an adhesive or other binder based on epoxy resin.

5. The stator unit according to claim 1 , wherein a cross-section of the elongated separating webs is U-shaped.

6. The stator unit according to claim 1 , wherein a cross-section of the elongated separating webs is V-shaped.

7. A method for assembling a stator insulation system for a stator unit, the method comprising steps of:
a 1 ) inserting a coil separator cage in an axial direction into a stator core, the coil separator cage having a substantially annular disc-shaped base part and elongated separating webs distributed over a circumference of the annular disc-shaped base part and extending with longitudinal axes of the elongated separating webs in the axial direction relative to the stator core, a cross-section of each of the elongated separating webs corresponding to a shape of each of a plurality of recesses in the annular disc-shaped base part, and which, together with the corresponding recesses, form axial channels extending over an entire length of the coil separator cage, such that between two adjacent coils, one of the elongated separating webs is inserted in the axial direction and the annular disc-shaped base part is fastened to a first end face of the stator core, wherein the stator core has coil webs on an inside of a substantially hollow-cylindrically shaped stator yoke, the coil webs uniformly distributed over a circumference of the stator core and directed radially inward relative to a cross-section of the stator core, wherein stator slots are formed between adjacent ones of the coil webs in a circumferential direction and lead wires are wound around the coil webs to form coils, and b) filling a gap between each of the coil separator cage and the coils with an insulating filler whereas the axial channels remain free for cooling, wherein the method further comprises a step a 2 ) following step a 1 ) and preceding method step b), attaching an inner closing ring to the coil separator cage, such that end areas of the elongated separating webs, which are opposite the annular disc-shaped base part, abut with inward-directed sides against an outer wall of the inner closing ring, and are distributed over a circumference thereof, such that the elongated separating webs are supported from an inside by the inner closing ring, and in method step b), the gap between each of the coil separator cage, the coils and the inner closing ring is filled with the insulating filler.

8. The method according to claim 7 , wherein the insulating filler is introduced into the gap as a potting compound.

Assignees

• Hanon Systems

Inventors

• Walisko David
• Mau Frank
• Hombitzer Marco

Classifications

• H02K15/105 Primary

  to the windings · CPC title

• H02K3/34

  between conductors or between conductor and core, e.g. slot insulation · CPC title

• H02K3/522

  for generally annular cores with salient poles · CPC title

• H02K3/38 Primary

  around winding heads, equalising connectors, or connections thereto · CPC title

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title