WO2007032740A1 - Stator cooling - Google Patents

Stator cooling Download PDF

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Publication number
WO2007032740A1
WO2007032740A1 PCT/SE2006/050329 SE2006050329W WO2007032740A1 WO 2007032740 A1 WO2007032740 A1 WO 2007032740A1 SE 2006050329 W SE2006050329 W SE 2006050329W WO 2007032740 A1 WO2007032740 A1 WO 2007032740A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
housing
cooling
volume
cooling fluid
Prior art date
Application number
PCT/SE2006/050329
Other languages
French (fr)
Inventor
Björn Lind
Original Assignee
Lind Finance & Development Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lind Finance & Development Ab filed Critical Lind Finance & Development Ab
Priority to DE112006002417T priority Critical patent/DE112006002417T5/en
Priority to GB0804201A priority patent/GB2443592A/en
Priority to EP06784242A priority patent/EP1941600A1/en
Publication of WO2007032740A1 publication Critical patent/WO2007032740A1/en

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

- A -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.
PCT/SE2006/050329 2005-09-15 2006-09-14 Stator cooling WO2007032740A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE112006002417T DE112006002417T5 (en) 2005-09-15 2006-09-14 stand cooling
GB0804201A GB2443592A (en) 2005-09-15 2006-09-14 Stator cooling
EP06784242A EP1941600A1 (en) 2005-09-15 2006-09-14 Stator cooling

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
SE0502035-9 2005-09-15

Publications (1)

Publication Number Publication Date
WO2007032740A1 true WO2007032740A1 (en) 2007-03-22

Family

ID=37865229

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2006/050329 WO2007032740A1 (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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013204047B4 (en) 2013-03-08 2018-08-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Electrical device with a coil
CN109194037A (en) * 2018-10-30 2019-01-11 清华大学 A kind of oil-cooled motor can isolate motor stator, rotor place space
WO2020214074A1 (en) * 2019-04-16 2020-10-22 Scania Cv Ab A rotary electric machine and a vehicle provided therewith
JP2021094413A (en) * 2015-10-09 2021-06-24 エーツェーペー エントヴィッケルングゲゼルシャフト エムベーハー Blood pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2500040B (en) * 2012-03-07 2018-07-04 Nidec Sr Drives Ltd Cooling of electrical machines

Citations (3)

* Cited by examiner, † Cited by third party
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
US5929543A (en) * 1996-09-16 1999-07-27 Isad Electronic Systems Gmbh & Co. Kg Electric machine having a cooling jacket
US6293769B1 (en) * 1999-02-03 2001-09-25 Pierburg Ag Canned pump with dry rotor compartment

Patent Citations (3)

* Cited by examiner, † Cited by third party
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
US5929543A (en) * 1996-09-16 1999-07-27 Isad Electronic Systems Gmbh & Co. Kg Electric machine having a cooling jacket
US6293769B1 (en) * 1999-02-03 2001-09-25 Pierburg Ag Canned pump with dry rotor compartment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013204047B4 (en) 2013-03-08 2018-08-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Electrical device with a coil
JP2021094413A (en) * 2015-10-09 2021-06-24 エーツェーペー エントヴィッケルングゲゼルシャフト エムベーハー Blood pump
JP7206306B2 (en) 2015-10-09 2023-01-17 エーツェーペー エントヴィッケルングゲゼルシャフト エムベーハー blood pump
JP2023033367A (en) * 2015-10-09 2023-03-10 エーツェーペー エントヴィッケルングゲゼルシャフト エムベーハー blood pump
US11826501B2 (en) 2015-10-09 2023-11-28 Ecp Entwicklungsgesellschaft Mbh Blood pump
CN109194037A (en) * 2018-10-30 2019-01-11 清华大学 A kind of oil-cooled motor can isolate motor stator, rotor place space
WO2020214074A1 (en) * 2019-04-16 2020-10-22 Scania Cv Ab A rotary electric machine and a vehicle provided therewith

Also Published As

Publication number Publication date
GB0804201D0 (en) 2008-04-16
EP1941600A1 (en) 2008-07-09
GB2443592A (en) 2008-05-07
SE529854C2 (en) 2007-12-11
SE0502035L (en) 2007-03-16
DE112006002417T5 (en) 2008-08-21

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