EP1941600A1 - Stator cooling - Google Patents
Stator coolingInfo
- Publication number
- EP1941600A1 EP1941600A1 EP06784242A EP06784242A EP1941600A1 EP 1941600 A1 EP1941600 A1 EP 1941600A1 EP 06784242 A EP06784242 A EP 06784242A EP 06784242 A EP06784242 A EP 06784242A EP 1941600 A1 EP1941600 A1 EP 1941600A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- housing
- cooling
- volume
- cooling fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
Definitions
- the present invention relates to cooling of an electric motor driving a shaft in an arbitrary application, for example spindles for milling, grinding, drilling and so forth.
- Figure 1 shows diagrammatically an embodiment of the invention
- Figure 2 shows another variation of the invention
- Figure 3 shows a section along the line A-A in Figure 2.
- Ia and Ib designate an essentially cylindrical housing, which has centrally the stator iron 3 of an electric motor connected to the housing Ia, and a shaft 4.
- the shaft 4, bearing the tool or the parts it is desired to rotate, can be mounted relative to the housing by any bearing method, for example fluid bearings, magnetic bearings, ball bearings or roller bearings.
- 7 designates the rotor of an electric motor, which rotor is fastened to the shaft 4.
- the stator winding 2 of the electric motor is, together with its stator iron 3, received in a space 10 in the housing Ia, Ib.
- the parts 2, 3 of the electric motor, sealing sleeves 5 and the housing Ia, Ib are cooled by a coolant which is introduced through an inlet 11 (lateral side of the housing in Fig. 1; end wall side of the housing in Fig. 2), flows through the stator winding 2 and the stator iron 3 via channels 8 (winding slots) and leaves the space 10 through an outlet 12 (lateral side of the housing in Fig. 1 ; end wall side of the housing in Fig. 2).
- the space 10 is thus sealed completely in relation to the rotating parts, the rotor 7 and the shaft 4, with the aid of the cylindrical sealing sleeves 5 arranged between the stator winding 2 and the rotor 7 with the shaft 4, which on the one hand seal in relation to the stator iron, the winding slots 8 of which are sealed in the region 9 between the stator winding and the rotor, and on the other hand are sealed by O rings for example in relation to the housing Ia and Ib.
- the design of the cooling system as described contributes considerably to the compact design of the unit. 15 indicates diagrammatically electric cables and other connections to the stator of the rotor.
- the active tool which is fixed to the shaft 4, is not illustrated in the drawing, but it is to be understood that such a tool functions in a known manner.
- the space 10 is flowed through by a coolant (inlet 11, outlet 12) which cools the stator iron, the stator winding and the housing Ia, Ib.
- a coolant inlet 11, outlet 12
- these must be insulated against direct contact with the coolant because the coolant can be electrically conductive or corrosive. This can suitably be effected by means of a thin, heat-conducting film made of a material which is not electrically conductive and is not affected by the coolant.
- a machinable material 14 which tolerates the coolant has been applied firmly to the outside diameter of the stator iron before the protective film is applied, whereupon the outside diameter of the stator can be machined exactly.
- 16 designates barriers which are arranged axially, extending from the inside of the housing end wall (on the right in Figure 3) to the stator iron 3
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
Arrangement for cooling a housing (Ia, Ib) with an inlet (11) and an outlet (12) and enclosing in its volume (10) a stator comprising stator winding (2) and stator iron (3) of an electric motor, which drives a rotor (7) with its shaft (4). The invention is characterized in that the volume (10) is arranged separated from the rotatable parts (7, 4) in a sealed manner.
Description
Stator cooling
The present invention relates to cooling of an electric motor driving a shaft in an arbitrary application, for example spindles for milling, grinding, drilling and so forth.
Many applications require both very efficient cooling of the stator of the electric motor and cost-effective and simple design, the requirements for the unit moreover being low weight and small volume. This is achieved in part by using an efficient and low-volume cooling method. This has been achieved by the invention having been provided with the feature indicated in Patent Claim 1.
The invention will be described in greater detail in the form of examples with reference to the drawing, in which Figure 1 shows diagrammatically an embodiment of the invention, Figure 2 shows another variation of the invention and Figure 3 shows a section along the line A-A in Figure 2.
In Figure 1 and Figure 2, Ia and Ib designate an essentially cylindrical housing, which has centrally the stator iron 3 of an electric motor connected to the housing Ia, and a shaft 4. The shaft 4, bearing the tool or the parts it is desired to rotate, can be mounted relative to the housing by any bearing method, for example fluid bearings, magnetic bearings, ball bearings or roller bearings.
In the drawing, 7 designates the rotor of an electric motor, which rotor is fastened to the shaft 4. The stator winding 2 of the electric motor is, together with its stator iron 3, received in a space 10 in the housing Ia, Ib. The parts 2,
3 of the electric motor, sealing sleeves 5 and the housing Ia, Ib are cooled by a coolant which is introduced through an inlet 11 (lateral side of the housing in Fig. 1; end wall side of the housing in Fig. 2), flows through the stator winding 2 and the stator iron 3 via channels 8 (winding slots) and leaves the space 10 through an outlet 12 (lateral side of the housing in Fig. 1 ; end wall side of the housing in Fig. 2). The space 10 is thus sealed completely in relation to the rotating parts, the rotor 7 and the shaft 4, with the aid of the cylindrical sealing sleeves 5 arranged between the stator winding 2 and the rotor 7 with the shaft 4, which on the one hand seal in relation to the stator iron, the winding slots 8 of which are sealed in the region 9 between the stator winding and the rotor, and on the other hand are sealed by O rings for example in relation to the housing Ia and Ib. The design of the cooling system as described contributes considerably to the compact design of the unit. 15 indicates diagrammatically electric cables and other connections to the stator of the rotor.
The active tool, which is fixed to the shaft 4, is not illustrated in the drawing, but it is to be understood that such a tool functions in a known manner.
As mentioned, the space 10 is flowed through by a coolant (inlet 11, outlet 12) which cools the stator iron, the stator winding and the housing Ia, Ib. In order to make cooling of the stator winding and the stator iron possible, these must be insulated against direct contact with the coolant because the coolant can be electrically conductive or corrosive. This can suitably be effected by means of a thin, heat-conducting film made of a material which is not electrically conductive and is not affected by the coolant. In order to make it possible to machine a close tolerance on the outside diameter of the stator without the stator iron being exposed, a machinable material 14 which tolerates the coolant has been applied firmly to the outside diameter of the stator iron before the
protective film is applied, whereupon the outside diameter of the stator can be machined exactly.
In Figure 3, 16 designates barriers which are arranged axially, extending from the inside of the housing end wall (on the right in Figure 3) to the stator iron 3
(its right end in the figure), and bring about reduced direct communication between the volumes at the inlet 11 and the outlet 12. This forces the bulk of the coolant to pass via the inlet 11 through the stator to its left side in the figure and back through the stator to the outlet 12. The purpose of this arrangement of the inlet and the outlet is that the coolant can be connected to the unit on only one side of the stator.
Claims
1. Arrangement for cooling a housing (Ia, Ib) with an inlet (11) and an outlet (12) and enclosing in its volume (10) a stator comprising stator winding (2) and stator iron (3) of an electric motor, which drives a rotor (7) with its shaft (4), characterized in that the volume (10) is arranged separated from the rotatable parts (7, 4) in a sealed manner.
2. Arrangement for cooling according to Claim 1, characterized in that a cooling fluid, such as gas or liquid, is arranged to pass in the housing around and/or through the parts (2, 3) of the stator, which have been sealed, at least in the regions where the parts of the stator are exposed to contact with the cooling fluid, with a heat-conducting surface coating resistant to the cooling fluid made of a material which is not electrically conductive.
3. Arrangement for cooling according to any one of the preceding claims, characterized in that the volume (10) of the housing (Ia, Ib) contains barriers (16) for guiding the flow path of the cooling fluid in the housing from the inlet (11) to the outlet (12) of the housing.
4. Method for sealing the rotor according to Claim 2, characterized in that a machinable material (14) resistant to the coolant is applied firmly to the outside diameter of the stator, a sealing protective film made of a material resistant to the coolant is applied to the stator iron and the stator winding, and the machinable material of the stator iron is machined to the desired exact diameter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0502035A SE529854C2 (en) | 2005-09-15 | 2005-09-15 | Apparatus for cooling a house and method |
| PCT/SE2006/050329 WO2007032740A1 (en) | 2005-09-15 | 2006-09-14 | Stator cooling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1941600A1 true EP1941600A1 (en) | 2008-07-09 |
Family
ID=37865229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06784242A Withdrawn EP1941600A1 (en) | 2005-09-15 | 2006-09-14 | Stator cooling |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1941600A1 (en) |
| DE (1) | DE112006002417T5 (en) |
| GB (1) | GB2443592A (en) |
| SE (1) | SE529854C2 (en) |
| WO (1) | WO2007032740A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2500040B (en) * | 2012-03-07 | 2018-07-04 | Nidec Sr Drives Ltd | Cooling of electrical machines |
| DE102013204047B4 (en) | 2013-03-08 | 2018-08-30 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Electrical device with a coil |
| EP3153191A1 (en) * | 2015-10-09 | 2017-04-12 | ECP Entwicklungsgesellschaft mbH | Blood pump |
| CN109194037B (en) * | 2018-10-30 | 2021-06-01 | 清华大学 | Oil-cooled motor for isolating space where motor stator and rotor are located |
| SE543340C2 (en) * | 2019-04-16 | 2020-12-08 | Scania Cv Ab | A rotary electric machine and a vehicle provided therewith |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1053647B (en) * | 1954-07-01 | 1959-03-26 | Westinghouse Electric Corp | Hermetically sealed, electric motor-pump unit |
| DE19637671C1 (en) * | 1996-09-16 | 1998-02-12 | Clouth Gummiwerke Ag | Dynamoelectric machine with a cooling jacket through which liquid flows |
| DE19904148C1 (en) * | 1999-02-03 | 2000-10-12 | Pierburg Ag | Electric feed pump |
-
2005
- 2005-09-15 SE SE0502035A patent/SE529854C2/en not_active IP Right Cessation
-
2006
- 2006-09-14 WO PCT/SE2006/050329 patent/WO2007032740A1/en not_active Ceased
- 2006-09-14 GB GB0804201A patent/GB2443592A/en not_active Withdrawn
- 2006-09-14 DE DE112006002417T patent/DE112006002417T5/en not_active Withdrawn
- 2006-09-14 EP EP06784242A patent/EP1941600A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2007032740A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| SE529854C2 (en) | 2007-12-11 |
| GB0804201D0 (en) | 2008-04-16 |
| DE112006002417T5 (en) | 2008-08-21 |
| WO2007032740A1 (en) | 2007-03-22 |
| SE0502035L (en) | 2007-03-16 |
| GB2443592A (en) | 2008-05-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20080410 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: LIND GAS BEARING TECHNOLOGY AB |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20170401 |