EP2719061A2 - Locking key - Google Patents
Locking keyInfo
- Publication number
- EP2719061A2 EP2719061A2 EP12743351.4A EP12743351A EP2719061A2 EP 2719061 A2 EP2719061 A2 EP 2719061A2 EP 12743351 A EP12743351 A EP 12743351A EP 2719061 A2 EP2719061 A2 EP 2719061A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- wedge
- closure
- base
- wedges
- grooves
- 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.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
- H02K3/487—Slot-closing devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
- H02K3/487—Slot-closing devices
- H02K3/493—Slot-closing devices magnetic
Definitions
- the invention relates to locking wedges for insertion into the keyways of electric motors or power generators.
- the rotor and the stator of an electric motor comprise pole shoes which are separated from one another by slots, between which coil windings, usually made of copper wire, run. Not only, but above all stabilization of the system against vibration, these grooves are closed after insertion of the coil windings with sealing wedges.
- closure wedges are nowadays usually made of plastics, especially glass fiber reinforced plastics (GRPs), on the one hand a layer structure and on the other hand, a filling with magnetic materials such as iron powder, have proven.
- GRPs glass fiber reinforced plastics
- the latter serves to give the wedge magnetic properties.
- the wedges are usually made by milling composite panels.
- the cross-sectional shape of the sealing wedges must be adapted precisely to those of the grooves in order to ensure the most stable possible seating in the groove. In Fig. 1, some known cross-sectional shapes are shown.
- Disadvantages of all known embodiments include, inter alia, that at an excessive content of magnetic filling, such as iron content, although the electrical and magnetic properties of the wedge are improved, but the mechanical strength decreases sharply.
- magnetic filling such as iron content
- the mechanical strength decreases sharply.
- delamination of the individual layers occurs, which can lead to breakage of the wedge and, as a consequence, to engine failure.
- spacers between the coil and the magnetic wedge which are not always completely wetted by the impregnating resin when the motor or generator is impregnated.
- the bond is not always complete, but there are areas of low adhesion, where the wedge thus sits slightly looser and can be further loosened by the constant mechanical and magnetic load until it can move so strong that delamination occurs.
- the aim of the invention was therefore to provide closure wedges, with which the above problems can be at least partially solved.
- a sealing wedge for insertion into a keyway of an electric motor or current generator, which is characterized in that it has a base on its inside and / or outside.
- a pedestal is herein understood to mean an extension of the wedge, which has a smaller width than the maximum width of the wedge and which protrudes into the groove or into the air gap above it.
- the maximum width of the wedge corresponds to the maximum distance between the Nutzähnen, in which the respective wedge is to be used.
- the wedge is secured against tilting and stabilized its seat in the groove, for which especially one of the inside provided, ie suitable in the groove protruding base.
- a provided on the outside of the wedge, ie up to the air gap protruding Socket also facilitates the heat dissipation to the outside.
- an internal base can itself serve as a previously described "spacer", which makes such a superfluous one-in particular, if several spacers are used.
- the dimensions of the pedestals are not particularly limited except for their width, which should substantially correspond to that of the groove at the respective location, and a person skilled in the art can easily achieve the optimum between material and manufacturing costs of a capped closure wedge without undue experimentation and determine the benefits that can be achieved thereby.
- the limitation of the height of the base results for internal plinths from the depth of the groove and for external plinths from the height to the air gap.
- the side walls of the base are preferably adapted to the respective course of the groove.
- the wedge itself is mirror-symmetrical about a central plane, i. the points of maximum width at the edges of the closure wedge lie substantially on a horizontal plane or at the same height, seen from the lowest point of the closure wedge - with or without lower base - from.
- This has the advantage that the fit in the keyways, which are usually at the same radial distance from the center of the engine, is easier to accomplish and the wedge sits more stress-free in the grooves.
- the entire closure wedge i. including the upper and / or lower base according to the invention, about a central plane mirror-symmetrical, but the base can also be shaped asymmetrically in special cases.
- the closure wedge according to the invention is integrally connected to the base (s), which increases the stability, improves the thermal conductivity and simplifies manufacture, since the closure wedge can be manufactured in one piece.
- the corners of the base (s) are preferably rounded or flattened.
- the closure wedge according to the invention preferably consists of a glass fiber reinforced plastic (GRP), so that conventional starting materials for the production of the new sealing wedges can be used.
- the closure wedge of the invention consists of a magnetic material, in particular of a fiberglass filled with iron powder.
- GRP glass fiber reinforced plastic
- Such embodiments have particular advantages, namely that the presence of additional magnetic material in the groove improves the electrical properties so that better heating and lower iron losses reduce the heating of the machine. Furthermore, this magnetic material has better thermal conductivity and thereby improves the dissipation of heat when it fills the groove instead of one or more spacers, which further reduces the heating of the machine.
- closure wedges according to the invention have recesses provided in the longitudinal direction and serving as ventilation slots, for example grooves or grooves, whereby the heat dissipation is improved.
- These ventilation slots can be mounted in the wedge, for example, by milling or pressing.
- the closure wedge of the invention may be at least partially coated with an insulating material.
- This insulating material can be applied in any manner, for example by spraying, dipping or coating coating or bonding.
- the insulating material is laminated to the closure wedge.
- Suitable insulating materials are all materials known for this purpose. Examples are polyethylene-felts, woven or unwoven, aramids (for example Nomex ®), or inorganic material-based products (eg. B. TufQUIN ® -Lamina- te).
- Fig. 1 shows some conventional cross-sectional shapes of prior art sealing wedges.
- FIG. 2 shows examples of the cross-sectional shape of closure wedges according to the invention.
- Fig. 3 shows examples of the shape of optional vents.
- FIG. Fig. 2a shows a closure wedge 1 with an inner base 2, i. the socket 2 extends to the bottom of the groove when the wedge is used.
- Fig. 2b shows an embodiment with two sockets, namely a base 2 on the inside and a base 3 on the outside.
- the "core" of the closure wedge i. the corresponding closing wedge without base, called. This corresponds in the embodiments shown in FIG. 2, the wedge of the prior art of Fig. 1 d, ie a double-sided wedge with flattened lateral tips.
- FIG. 3 shows two examples of optional ventilation slots in the closure wedges according to the invention, wherein FIG. 3a shows a polygonal and FIG. 3b a round embodiment of the ventilation slots.
- the production of the capped locking wedges according to the invention can be carried out by any shaping process, for example by conventional milling of blocks, preferably glass fiber reinforced synthetic resin, in particular epoxy resin, optionally containing one or more conventional fillers.
- the capped locking wedges of the invention shown in Fig. 2 were prepared and compared with the non-pedestal locking wedge corresponding thereto, as shown in Fig. 1d. Even without much effort was difficult to determine that even with great effort a deliberate tilting of the wedge is no longer possible.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Lock And Its Accessories (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HUU1400115U HU4697U (en) | 2011-06-10 | 2012-06-08 | Slot wedge for rotor of electric motor or generator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATGM332/2011U AT12977U1 (en) | 2011-06-10 | 2011-06-10 | CLOSING WEDGE |
PCT/AT2012/050080 WO2012167299A2 (en) | 2011-06-10 | 2012-06-08 | Locking key |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2719061A2 true EP2719061A2 (en) | 2014-04-16 |
Family
ID=47296530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12743351.4A Ceased EP2719061A2 (en) | 2011-06-10 | 2012-06-08 | Locking key |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP2719061A2 (en) |
CN (1) | CN103858320A (en) |
AT (1) | AT12977U1 (en) |
DE (1) | DE202012013657U1 (en) |
FI (1) | FI10598U1 (en) |
HU (1) | HU4697U (en) |
WO (1) | WO2012167299A2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014207468A1 (en) * | 2014-04-17 | 2015-10-22 | Zf Friedrichshafen Ag | Cooling for a winding head of an electric machine |
DE102015222276A1 (en) * | 2015-11-12 | 2017-05-18 | Volkswagen Aktiengesellschaft | Nut cover for frictional support against two opposite side walls in a stator |
DE102016201048A1 (en) * | 2016-01-26 | 2017-07-27 | Volkswagen Aktiengesellschaft | Rotor, electric machine and method of manufacture |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB259611A (en) * | 1925-10-09 | 1927-01-06 | British Thomson Houston Co Ltd | Improvements in and relating to magnetic wedges |
CH652254A5 (en) * | 1980-01-15 | 1985-10-31 | Westinghouse Electric Corp | Slot closer for dynamo-electric machines |
WO1986003070A1 (en) * | 1984-11-14 | 1986-05-22 | General Electric Company | Dynamoelectric machine slot wedges with abrasion resistant layer |
US5214839A (en) * | 1989-05-19 | 1993-06-01 | General Electric Company | Method of making dynamoelectric machines including metal filled glass cloth slot closure wedges |
CN1111411A (en) * | 1994-05-05 | 1995-11-08 | 陈启星 | Electric machine with stacked slot wedge of alternated ferromagnetic material and nonmagnetic material |
EP2169809A1 (en) * | 2008-09-30 | 2010-03-31 | Ansaldo Sistemi Industriali S.p.A. | A ferromagnetic wedge for closing slots of a rotating electric machine and a machine structure which incorporates the wedge |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE359410B (en) * | 1971-12-27 | 1973-08-27 | Asea Ab | |
YU35205B (en) * | 1972-06-14 | 1980-09-25 | Elektrotehnicki Inst Preduzeca | Magnetically conductive wedge for closing slots |
SE429592B (en) * | 1980-01-03 | 1983-09-12 | Westinghouse Electric Corp | Slot wedge for an electrical machine |
US5093597A (en) * | 1990-10-01 | 1992-03-03 | Westinghouse Electric Corp. | Brushless exciter saturable reactor diode snubber |
JP3574221B2 (en) * | 1995-06-09 | 2004-10-06 | 三菱電機株式会社 | Rotating electric machine rotor |
FI970943A (en) * | 1997-03-05 | 1998-09-06 | Jarmo Alamaeki | Method and apparatus for reworking magnetic flux |
JPH1155885A (en) * | 1997-08-05 | 1999-02-26 | Hitachi Ltd | Motor-driven blower and electric cleaner using the same |
US6844653B2 (en) * | 2003-03-31 | 2005-01-18 | Valeo Electrical Systems, Inc. | Stator design for permanent magnet motor with combination slot wedge and tooth locator |
CN2850124Y (en) * | 2006-01-25 | 2006-12-20 | 包头长安永磁电机研发有限公司 | Improved permanent magnet DC brushless speed change constant voltage wind driven generator |
US8129880B2 (en) * | 2007-11-15 | 2012-03-06 | GM Global Technology Operations LLC | Concentrated winding machine with magnetic slot wedges |
CN201230241Y (en) * | 2008-07-17 | 2009-04-29 | 哈尔滨电机厂有限责任公司 | Stator end slot wedge for turbine generator |
JP2010200578A (en) * | 2009-02-27 | 2010-09-09 | Hitachi Ltd | Rotary electric machine |
-
2011
- 2011-06-10 AT ATGM332/2011U patent/AT12977U1/en not_active IP Right Cessation
-
2012
- 2012-06-08 WO PCT/AT2012/050080 patent/WO2012167299A2/en unknown
- 2012-06-08 EP EP12743351.4A patent/EP2719061A2/en not_active Ceased
- 2012-06-08 CN CN201280036304.2A patent/CN103858320A/en active Pending
- 2012-06-08 DE DE202012013657.7U patent/DE202012013657U1/en not_active Expired - Lifetime
- 2012-06-08 HU HUU1400115U patent/HU4697U/en unknown
-
2014
- 2014-05-13 FI FIU20144105U patent/FI10598U1/en not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB259611A (en) * | 1925-10-09 | 1927-01-06 | British Thomson Houston Co Ltd | Improvements in and relating to magnetic wedges |
CH652254A5 (en) * | 1980-01-15 | 1985-10-31 | Westinghouse Electric Corp | Slot closer for dynamo-electric machines |
WO1986003070A1 (en) * | 1984-11-14 | 1986-05-22 | General Electric Company | Dynamoelectric machine slot wedges with abrasion resistant layer |
US5214839A (en) * | 1989-05-19 | 1993-06-01 | General Electric Company | Method of making dynamoelectric machines including metal filled glass cloth slot closure wedges |
CN1111411A (en) * | 1994-05-05 | 1995-11-08 | 陈启星 | Electric machine with stacked slot wedge of alternated ferromagnetic material and nonmagnetic material |
EP2169809A1 (en) * | 2008-09-30 | 2010-03-31 | Ansaldo Sistemi Industriali S.p.A. | A ferromagnetic wedge for closing slots of a rotating electric machine and a machine structure which incorporates the wedge |
Non-Patent Citations (1)
Title |
---|
See also references of WO2012167299A2 * |
Also Published As
Publication number | Publication date |
---|---|
HU4697U (en) | 2017-02-28 |
WO2012167299A3 (en) | 2013-07-18 |
DE202012013657U1 (en) | 2019-02-15 |
WO2012167299A2 (en) | 2012-12-13 |
CN103858320A (en) | 2014-06-11 |
AT12977U1 (en) | 2013-03-15 |
FI10598U1 (en) | 2014-08-28 |
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