WO2010108848A1 - Elektrische maschine - Google Patents
Elektrische maschine Download PDFInfo
- Publication number
- WO2010108848A1 WO2010108848A1 PCT/EP2010/053540 EP2010053540W WO2010108848A1 WO 2010108848 A1 WO2010108848 A1 WO 2010108848A1 EP 2010053540 W EP2010053540 W EP 2010053540W WO 2010108848 A1 WO2010108848 A1 WO 2010108848A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cage
- pole housing
- individual magnets
- electrical machine
- brushes
- Prior art date
Links
Classifications
-
- 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
- H02K5/14—Means for supporting or protecting brushes or brush holders
- H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
- H02K5/145—Fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
Definitions
- the DE 34 26 996 A1 relates to an electric motor which is used to drive a fuel delivery pump.
- the electric motor comprises a rotor and a magnet system belonging to a stator of the electric motor, which has an annular, ferromagnetic yoke body and at least one permanent magnet magnet segment arranged on its inner wall.
- the magnet segment is fixed in a well-defined position by means of a tube-like holding device, which is inserted in a suitable manner into the return ring and locked against the return ring.
- a particularly effective way of securing the magnet system in the return ring is achieved in that the holding device for each magnet segment has a breakthrough whose size is matched to the projection dimensions of the magnet resulting from radial observation and the holding device further comprises spring means which the magnetic segment against the Press the inner wall of the return ring.
- the holding device is designed to fit the return ring and inserted into this and is locked by means of a protruding on the outer circumference of the nose, which is received in an open-edge groove of the return ring, against this.
- DE 101 48 652 A1 relates to a direct current machine and a method for fixing magnets to a pole housing of a DC machine.
- a magnetic holding device is attached to which the magnets, which are in particular permanent magnets, are held.
- the magnet holding device is fixed to the inner periphery of the pole housing and formed by an annular holding cage.
- the holding cage is provided with a continuous slot extending in the axial direction and spring-loaded. table, preferably formed in one piece.
- the holding cage is worked out of a board, preferably punched and then brought by rolling into its ring shape.
- the holding cage according to DE 101 48 652 A1 is held non-positively in the pole housing of the DC machine.
- the frictional connection is generated due to material-related restoring forces of the rolled in its annular shape holding cage, which are possibly still be increased by overpressing the rolled holding cage.
- the holding cage has pockets for receiving in each case a magnet.
- the magnet holder which was previously designed in several parts, is then fixed by means of stampings or impressions which are applied in the pole housing, then the positional accuracy of the magnets and of the brushes is defined by the accuracy of these impressions or stampings. If inaccuracies occur during the introduction of the stampings into the material of the pole housing, this tolerance is added to the already very long tolerance chain.
- the preferably made of a part cage for receiving the individual magnets, in particular the permanent magnets, i. the stator magnet encloses the rotor, i. the rotor of the electric machine and the recorded on the rotor shaft commutator.
- the commutator in turn, brushes are associated in brushes, which in turn are attached to a base plate of a brush holder assembly.
- the brush holder assembly i. the base plate for receiving the brushes is also aligned by the cage.
- the cage which is manufactured in a particularly simple manufacturing technology as a plastic injection molded component, the possibility of one hand to receive the individual magnets, in particular the permanent magnets and on the other hand at the same time the base plate for receiving the brush holder, which serve to accommodate the brush align. This minimizes the angular tolerance of these components with respect to each other. Spring elements for fixing the individual magnets to the
- Inner peripheral surface of the pole housing can be omitted, as well openings that were previously provided on the rod-shaped river iron components in order to attach and lock these projections on the inside of the pole housing can also be omitted.
- the inventively proposed solution of using a common cage for receiving the individual magnets, in particular the permanent magnets, and for aligning the base plate for the brushes allows a reduction in the angular tolerance between the circumferential position of the individual magnets and the position of the carbon brushes.
- the solution proposed according to the invention minimizes the angular tolerance between the center line of the brushes and the center line of the individual magnets when installed to a minimum. This can be achieved in a particularly simple manufacturing process and wall of the commutation of the electrical machine can be ensured.
- the cage which is preferably made as a one-piece plastic injection molded component, is provided with a number of positioning cams, for example three positioning cams on one of the rings between which the longitudinal ribs extend in the axial direction, on the outer circumference of one of the rings or both rings for example, are formed in a 120 ° division.
- positioning cams can be in manufacturing technology particularly simple manner during injection molding of
- a recess for example a semicircular indentation
- a recess can be formed by way of the plastic injection molding process, which aligns with punches or recesses to be inserted later in the material of the pole housing, so that the cage engages in the indentations formed on the inner circumferential surface and fixed in its circumferential position on the one hand in the pole housing and on the other hand remains aligned in a defined position.
- the cage for receiving the individual magnets in particular the permanent magnets of the stator and for aligning the base plate of the carbon brushes pedestals are molded in a number that corresponds to the number noted herein.
- the pods molded onto the cage-side end of the cage are molded onto one of the rings of the cage and, in accordance with the number of carbon brushes to be fixed, in a 90.degree.
- FIG. 2 shows a view of prior art fixation of river iron on the inner circumferential surface of the pole housing
- FIG. 3 shows the angular offset to be minimized between the center line of brushes and that of individual magnets which are accommodated on the inner circumferential surface of the pole housing
- FIG. 4 shows the resulting tolerance chain in the solution according to the prior art using many individual components
- FIG. 5 shows a perspective view of the cage of the electric machine proposed according to the invention, the brushes on the one hand, and the individual magnets on the other hand,
- Figure 6 is a perspective view of the cage according to Figure 5 in a
- Figure 7 shows a stocked with individual magnets and river iron cage with a number of positioning cams.
- FIG. 1 shows a multi-part magnet holder of an electrical machine according to the prior art.
- FIG. 1 shows that a pole housing 10 encloses a multipart magnet holder 12. This comprises two rings, which are connected to each other by longitudinal webs. Each of the rings is fixed and aligned by corresponding positioning cams on the inner peripheral surface of the pole housing 10. Along the magnetic holder 12, individual river iron, see chisel 16, and individual magnets 14 extend.
- the illustration in accordance with FIG. 2 shows that the pole housing 10 has individual magnets 14 and flux iron 16 arranged therebetween on an inner circumferential surface 30 in an alternating sequence. These are at the inner peripheral surface 30 of the pole housing 10 arranged in an alternating order in the circumferential direction.
- the representation according to FIG. 2 shows that the river iron 16 comprises retaining hooks 24 and openings 18. Protrusions 20, which are formed on the inner peripheral surface 30 of the PoI housing 12, project into the openings 20 of the river iron 16 and fix the river iron 16 in its installed position.
- FIG. 3 shows an electrical machine in which the center lines of brushes and individual magnets, which are accommodated on the inner circumferential surface of the pole housing, extend in an angular tolerance with respect to one another.
- Reference numeral 50 denotes a winding connection on the stator 56 of the electric machine 52, which are arranged by the individual on the inner peripheral surface 30 of the pole housing 10
- the brushes 40 are each received in brush boilers 42.
- the illustration according to FIG. 4 shows how the tolerance chain in the solutions according to the prior art is usually composed.
- the protrusions 20 formed on the inner peripheral surface 30 of the pole housing 10 are provided with a 1. Tolerance 32 suffers with regard to its dimensioning.
- the cams 20 are enclosed by the openings 18 of the river iron 16, wherein the production of these openings 18 of the river iron 16 may be subject to a third tolerance 36.
- 16 latching hooks 24 are formed at the openings 18 of the river iron 16 opposite ends of the river iron.
- the production-related with a second tolerance 34 are afflicted.
- pole housing 10, river iron 16 and base plate 26 of the brush holder assembly occur three tolerances 32, 34 and 36, while 10 relative to the pole housing angle tolerances 38 occur.
- FIG. 5 shows a perspective view of the cage proposed according to the invention for an electric machine for aligning the brushes and for accommodating individual magnets, in particular permanent magnets.
- the one-piece cage 62 can be manufactured in a particularly simple manner in terms of production technology as a plastic injection-molded component.
- the cage 62 according to the perspective representation in FIG. 5 comprises individual longitudinal ribs 68 extending in the axial direction of the electric machine 52.
- the longitudinal ribs 68 which extend between two spaced-apart rings 64 and 66 of the cage 62 provide free spaces 70.
- the free spaces 70 are used to hold the individual magnets 14 and the inclusion of the river iron 16.
- the positioning cam 78 can be attached to one of the rings 64, 66 in 120 ° pitch or 90 ° pitch. In manufacturing technology particularly simple manner, the positioning cam 78 can be injection-molded directly in the production of the cage 62 by means of plastic injection molding process. On one of the two rings 64 and 66 of the cage 62 are also also extending in the axial direction individual pedestals 76. The pedestals 76 are also manufactured in a particularly simple manufacturing technology in one operation during injection molding of the cage 62 made of plastic material and require none treatment.
- a corresponding number of pedestals 76 are provided at the brush holder end of the cage 62.
- the angle tolerance 38 between the position of the brushes 40 and the position of the individual magnets 14 is minimized, since the individual magnets 14 are received in the cage 62 and the brushes 40 are aligned therethrough.
- the tolerance chain is thus considerably shortened.
- Each of the clearances 70 is defined by a longitudinal side 72 formed by an outer side of the longitudinal rib 68 and by a peripheral side 74, i. limited by segments of the rings 64 and 66 corresponding to the diameter of the cage 62.
- FIG. 6 shows the perspective reproduction of the preassembled cage in the pole housing.
- the illustration according to FIG. 5 shows that a single magnet 14, which is preferably a permanent magnet, and a flux iron 16 are integrated in a free space 70 which extends between two longitudinal ribs 68.
- the positioning cams 78 injection-molded on the outer circumference of the ring 66 correspond in each case to the geometry of stampings 22 in the material of the pole housing.
- the punches 22 in the material of the pole housing are punched in a corresponding to the pitch of the positioning cam 78 at one of the rings corresponding pitch in the material of the pole housing 10 or introduced introduced in some other way.
- the individual positioning cam 78 are provided with rounded recesses 80, in which engage the stampings in the material of the pole housing for fixing one of the rings 64 and 66 of the cage 62 made of plastic material.
- the cage 62 which is manufactured as a one-piece component, is fixed to only one of the rings 64, 66 on the inner circumferential surface 30 of the pole housing 10.
- a first ring 64 of the cage 62 are the already indicated in the perspective view of Figure 5 podiums 76, which engage behind the brush holder 42, in which the brushes 40, which cooperate with the commutator 48 and support.
- the base plate 26 of the brush holder arrangement defining the angular position of the brush holder 42 in the illustration according to FIG. 4 can be advantageously aligned. This results from the illustrated in Figure 7 preassembled cage assembly 62 on the one hand, an alignment of the individual magnets 14 and the river iron 16 side by side in a free space 70 on the circumference of the cage 62 and by the pedestals 76, on the other hand, an exact alignment of the base plate 26, in which the brush holder 42 are accommodated for receiving the brush 40.
- the angular tolerance 38 according to FIGS. 3 and 4 is drastically reduced, which is due to the shortening of the tolerance chain to a component, namely the cage 62.
- the cage 62 can be fixed to the inner peripheral surface 30 of the pole housing 10 as shown in FIG. 6 at only three points, ie three stamped areas 22 which are circumferentially divided by 120.degree Pol housing 10 are arranged can be achieved.
- the tolerance chain can be shortened by reducing the number of components by a component, namely the cage 62, used to align the base plate 26 of the brush 40 for receiving and positioning of the individual magnets 14 and for fixing in the pole housing 10 ,
- the cage 62 proposed according to the invention is preferably made of plastic injection molding material, so that the positioning cams 78, the pedestals 76 as well as the free spaces delimited by the longitudinal ribs 68, in one operation, i. with minimal tolerance in relation to each other.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Motor Or Generator Frames (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10710287A EP2412075A1 (de) | 2009-03-25 | 2010-03-18 | Elektrische maschine |
CN2010800133516A CN102362409A (zh) | 2009-03-25 | 2010-03-18 | 电机 |
BRPI1010012A BRPI1010012A2 (pt) | 2009-03-25 | 2010-03-18 | motor elétrico |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009001837.9 | 2009-03-25 | ||
DE200910001837 DE102009001837A1 (de) | 2009-03-25 | 2009-03-25 | Elektrische Maschine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010108848A1 true WO2010108848A1 (de) | 2010-09-30 |
Family
ID=42358606
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/053540 WO2010108848A1 (de) | 2009-03-25 | 2010-03-18 | Elektrische maschine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2412075A1 (de) |
CN (1) | CN102362409A (de) |
BR (1) | BRPI1010012A2 (de) |
DE (1) | DE102009001837A1 (de) |
WO (1) | WO2010108848A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010063514A1 (de) * | 2010-12-20 | 2012-06-21 | Robert Bosch Gmbh | Elektrische Maschine mit Befestigungsvorrichtung für Magneten |
DE102013225968A1 (de) * | 2012-12-20 | 2014-06-26 | Robert Bosch Gmbh | Vorrichtung zur Fixierung von Magneten in elektrischen Maschinen |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4071794A (en) * | 1975-11-10 | 1978-01-31 | General Motors Corporation | DC motor with permanent magnet retaining structure |
DE3426996A1 (de) | 1984-07-21 | 1986-02-06 | Robert Bosch Gmbh, 7000 Stuttgart | Elektromotor, insbesondere zum antreiben einer kraftstoffoerderpumpe |
US4851729A (en) * | 1986-03-17 | 1989-07-25 | Johnson Electric Industrial Manufactory, Limited | Electric motor |
DE10148652A1 (de) | 2001-10-02 | 2003-04-17 | Bosch Gmbh Robert | Gleichstrommaschine und Verfahren zum Befestigen von Magneten an einem Polgehäuse einer Gleichstrommaschine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3025421A (en) * | 1958-06-27 | 1962-03-13 | Barber Colman Co | Brush mounting for small commutator type motors |
DE19517668A1 (de) * | 1995-05-13 | 1996-11-14 | Vdo Schindling | Gehäuse |
JP2004120916A (ja) * | 2002-09-27 | 2004-04-15 | Aichi Electric Co Ltd | 回転子 |
-
2009
- 2009-03-25 DE DE200910001837 patent/DE102009001837A1/de not_active Withdrawn
-
2010
- 2010-03-18 BR BRPI1010012A patent/BRPI1010012A2/pt not_active Application Discontinuation
- 2010-03-18 WO PCT/EP2010/053540 patent/WO2010108848A1/de active Application Filing
- 2010-03-18 EP EP10710287A patent/EP2412075A1/de not_active Withdrawn
- 2010-03-18 CN CN2010800133516A patent/CN102362409A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4071794A (en) * | 1975-11-10 | 1978-01-31 | General Motors Corporation | DC motor with permanent magnet retaining structure |
DE3426996A1 (de) | 1984-07-21 | 1986-02-06 | Robert Bosch Gmbh, 7000 Stuttgart | Elektromotor, insbesondere zum antreiben einer kraftstoffoerderpumpe |
US4851729A (en) * | 1986-03-17 | 1989-07-25 | Johnson Electric Industrial Manufactory, Limited | Electric motor |
DE10148652A1 (de) | 2001-10-02 | 2003-04-17 | Bosch Gmbh Robert | Gleichstrommaschine und Verfahren zum Befestigen von Magneten an einem Polgehäuse einer Gleichstrommaschine |
Non-Patent Citations (1)
Title |
---|
See also references of EP2412075A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102362409A (zh) | 2012-02-22 |
EP2412075A1 (de) | 2012-02-01 |
BRPI1010012A2 (pt) | 2016-04-19 |
DE102009001837A1 (de) | 2010-09-30 |
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