EP4070438A1 - Verbindung rotorwelle zu blechpaket - Google Patents
Verbindung rotorwelle zu blechpaketInfo
- Publication number
- EP4070438A1 EP4070438A1 EP20808430.1A EP20808430A EP4070438A1 EP 4070438 A1 EP4070438 A1 EP 4070438A1 EP 20808430 A EP20808430 A EP 20808430A EP 4070438 A1 EP4070438 A1 EP 4070438A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor shaft
- rotor
- elevations
- electric motor
- recesses
- 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- Withdrawn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
-
- 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
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
Definitions
- the present invention relates to a rotor for an electric motor, with a rotor shaft and a rotor lamination attached to the rotor shaft with a number of lamination sheets arranged along an axis of the rotor lamination.
- the present invention also relates to an electric motor with a rotor.
- Electric motors in particular brushless electric motors, with a stator and a rotor rotating in the stator are largely known from the prior art.
- the German patent application DE 102010031399 A1 shows, for example, a rotor according to the prior art.
- a rotor for an electric motor usually consists of a number of stacked laminations to form a so-called laminated stack and a rotor shaft which is positioned through a central opening in the laminated stack.
- the laminated core and the rotor shaft are connected to one another so that they cannot rotate.
- the connection usually takes place via a radial press fit or press fit of the rotor shaft in the laminated core.
- the rotor shaft in the event of abrupt braking or high torque surges from the electric motor, the rotor shaft must in some cases transmit high torsional loads to the laminated core.
- a radial press fit can lead to slipping in the case of high torsional load peaks and unfavorable tolerance pairs. This leads to a reduction in the power of the electric motor.
- the object of the present invention is therefore to provide a rotor for an electric motor and an electric motor with which the above-mentioned problem can be solved and power losses can be reduced.
- the object is correspondingly achieved by the subject matter of independent claims 1 and 4. Further advantageous embodiments of the invention can be found in the corresponding subclaims.
- a rotor for an electric motor with a rotor shaft and a rotor lamination attached to the rotor shaft with a number of laminations arranged along an axis of the rotor lamination.
- each lamination stack contains a central recess with a contour, penetrated by the rotor shaft, which contains at least two radially extending elevations and at least two recesses positioned between the elevations, with a distance between the free ends to form a press fit of the laminations on the rotor shaft of the elevations is smaller than a diameter of the rotor shaft and wherein a channel extending peripherally on the rotor shaft is formed by the respective recess of the stacked laminations arranged one behind the other.
- the press-fit contact between the rotor shaft and the laminated core is interrupted several times by the recesses. In these interruptions, which can also be referred to as air pockets, the magnetic field lines of the laminated core are shielded from the rotor shaft. This reduces the penetration of the magnetic field lines from the stacked laminations into the rotor shaft.
- the rotor is provided for an electric motor of a machine tool, in particular a hammer drill, a saw, a grinding device or the like.
- the rotor shaft may contain at least one groove running in a spiral around a lateral surface.
- the electric motor is designed as a brushless electric motor.
- FIG. 1 a perspective view of a rotor with a number of laminations and a rotor shaft
- FIG. 2a shows a front view of the rotor with the rotor shaft and the laminations according to a first embodiment
- FIG. 2b shows a front view of a package sheet according to a second embodiment
- FIG. 3 shows a perspective view of a rotor shaft
- FIG. 4 shows a perspective view of a single lamination stack on the rotor shaft
- FIG. 5 shows a perspective sectional view through a rotor with plastic injected between the laminations and the rotor shaft.
- FIG. 1 shows a schematic representation of a rotor 1 according to the invention for an electric motor.
- the electric motor can in turn serve as a drive for generating a torque in a machine tool.
- the machine tool can be designed as a drill, hammer drill, saw, grinder or the like. Neither the electric motor nor the machine tool are shown in the figures.
- the rotor 1 essentially contains a laminated rotor core 2 (also just called a laminated core) and a rotor shaft 3.
- the rotor shaft 3 is designed to be essentially cylindrical.
- the rotor shaft 3 has a uniform diameter D2.
- FIG. 2a shows a package sheet 4 according to a first embodiment
- FIG. 2b shows a package sheet 4 according to a second embodiment.
- Each individual package sheet 4 essentially contains a central recess 5 and several recesses 7.
- the package sheet 4 according to the first and second embodiment each contains four recesses 7.
- the four recesses 7 are circular around the central recess 5 arranged and each serve to accommodate a magnet 8.
- the magnets 8 can be permanent magnets. The magnets 8 are indicated in FIG.
- the package sheet 4 according to the first embodiment contains a first, second, third and fourth elevation 9 around the central recess 5, see FIG. 2a.
- the package sheet 4 according to the second embodiment contains a first, second and third elevation 9 around the central recess 5, see FIG. 2b.
- the elevation 9 can also be referred to as a web.
- Each elevation 9 has a first end 9a and a second end 9b.
- the elevation 9 is positioned with the first end 9a on the inner circumferential surface of the central recess 5.
- the second end 9b of each elevation 5, which can also be referred to as the free end 9b, extends in the radial direction to the center of the central recess 5 of the stacking sheet 4.
- each elevation 9 also extends in the radial direction to the center of the central recess 5 .
- two elevations 9 are positioned opposite one another around the central recess 5.
- the assessment 9 are rotated 90 ° to each other and positioned around the inner circumferential surface of the central recess 5.
- elevations are positioned radially around the central recess.
- the elevations are each positioned around the inner circumferential surface of the central recess, rotated 120 ° to one another.
- the individual laminations are positioned or arranged one behind the other in direction A in order to form the cylindrical laminated rotor stack.
- the rotor shaft is pushed through the central recess of the individual laminations and positioned there so that the rotor is formed.
- the rotor shaft is shown. As can be seen, two spiral-shaped depressions are provided on the lateral surface or on the surface. The recess can also be referred to as a groove. According to an alternative embodiment, the rotor shaft does not have a spiral, but rather punctiform, circular, elongated or ring-shaped depressions.
- the distance D1 or distance between the second ends 9b of the elevations 9 is smaller than the diameter D2 of the rotor shaft 3. Because the distance D1 between the second ends 9b of the elevations 9 is smaller than the diameter D2 of the rotor shaft 3, the Rotor shaft 3 can be pressed with a certain amount of force in direction A through the central recess 5 of the stacked sheets 4. When the rotor shaft 3 is positioned in the central recess 5 of the laminations 4, the elevations 9 are widened by a certain amount. The rotor shaft 3 is thus in a press fit or in a press contact with the stacked laminations 4. The press contact produced in this way can prevent torsion of the rotor shaft 3 with respect to the stacked laminations 2.
- more or fewer than three or four elevations 9 can also be provided on the respective package sheet 4. If an even number of elevations 9 is selected, two elevations 9 are always positioned or arranged opposite one another. A symmetry of the elevations 9 is sought.
- a recess 10 is provided on each stacking sheet 4 between two adjacent elevations 9.
- the package sheet 4 according to the first embodiment contains a first, second, third and fourth cutout 10.
- the recesses 10 are also Rotated 90 ° to each other in each case positioned around the inner circumferential surface of the central recess 5.
- An elevation 9 and an adjacent recess 10 are each arranged rotated 45 ° to one another.
- a first, second and third recess 10 are included in the package sheet 4 according to the second embodiment.
- the recesses 10 are each positioned around the inner circumferential surface of the central recess 5, rotated by 120 ° with respect to one another.
- the laminations 4 are positioned one behind the other in direction A to form a laminated rotor stack 2 and the recesses 7 of each laminate 4 are also positioned one behind the other in direction A, evenly distributed channels 11 are formed in the recesses 10 around the outer surface of the rotor shaft 3.
- the channels 11 are positioned between the inner circumferential surface of the central recess 5 of the laminated core 4 and the outer circumferential surface of the rotor shaft 3 and extend over the entire length of the laminated rotor core 2.
- liquid plastic KS can be introduced into the respective channels 11.
- a thermosetting plastic can be used as the plastic KS.
- a transfer molding process can be used to introduce the liquid plastic KS.
- the injected and finally hardened plastic KS serves as a partially positive and non-positive connection between the stacked sheets 4 and the rotor shaft 3, so that any possible twisting of the rotor shaft 3 with respect to the stacked sheets 4 can be reduced when the rotor 1 rotates in the direction of rotation R.
- the rotor shaft 3 can also contain a groove 12 running spirally around a jacket surface of the rotor shaft 3, see FIG the rotor shaft is generated.
- the circumferential groove 12 also serves to ensure that the liquid injected plastic KS adheres better between the laminations 4 and the rotor shaft 3.
- This groove 12 in conjunction with the recesses 10 in the laminated core 2, is filled with plastic KS to act as an anti-twist device.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19213514.3A EP3832852A1 (de) | 2019-12-04 | 2019-12-04 | Verbindung rotorwelle zu blechpaket |
PCT/EP2020/083160 WO2021110471A1 (de) | 2019-12-04 | 2020-11-24 | Verbindung rotorwelle zu blechpaket |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4070438A1 true EP4070438A1 (de) | 2022-10-12 |
Family
ID=68771492
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19213514.3A Withdrawn EP3832852A1 (de) | 2019-12-04 | 2019-12-04 | Verbindung rotorwelle zu blechpaket |
EP20808430.1A Withdrawn EP4070438A1 (de) | 2019-12-04 | 2020-11-24 | Verbindung rotorwelle zu blechpaket |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19213514.3A Withdrawn EP3832852A1 (de) | 2019-12-04 | 2019-12-04 | Verbindung rotorwelle zu blechpaket |
Country Status (4)
Country | Link |
---|---|
US (1) | US20230041078A1 (de) |
EP (2) | EP3832852A1 (de) |
CN (1) | CN114631247A (de) |
WO (1) | WO2021110471A1 (de) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4432356A1 (de) * | 1994-09-12 | 1996-03-14 | Atlas Copco Elektrowerkzeuge | Montageverfahren und Läufer eines Elektromotors |
US5986366A (en) * | 1998-09-23 | 1999-11-16 | Sundstrand Corporation | Rotor for a dynamoelectric machine |
DE10342694A1 (de) * | 2003-09-16 | 2005-04-28 | Hilti Ag | Rotorblechlamelle mit bevorzugter Drehrichtung |
US7709991B2 (en) * | 2005-12-08 | 2010-05-04 | A. O. Smith Corporation | Rotor assembly for an electric machine including a vibration damping member and method of manufacturing same |
DE102007000213A1 (de) * | 2007-04-10 | 2008-10-16 | Hilti Aktiengesellschaft | Permanentmagnetmotor |
DE102010031399A1 (de) | 2010-07-15 | 2012-01-19 | Hilti Aktiengesellschaft | Rotor für einen Elektromotor, Elektromotor und Herstellungsverfahren für einen Elektromotor |
DE102014007247A1 (de) * | 2014-05-16 | 2015-11-19 | Festool Gmbh | Elektrischer Motor einer Hand-Werkzeugmaschine |
US10348145B2 (en) * | 2014-07-01 | 2019-07-09 | Mitsubishi Electric Corporation | Rotor, electric motor, compressor, and blower |
KR102377778B1 (ko) * | 2017-07-19 | 2022-03-23 | 삼성전자주식회사 | 밀폐형 압축기 |
-
2019
- 2019-12-04 EP EP19213514.3A patent/EP3832852A1/de not_active Withdrawn
-
2020
- 2020-11-24 US US17/778,547 patent/US20230041078A1/en active Pending
- 2020-11-24 EP EP20808430.1A patent/EP4070438A1/de not_active Withdrawn
- 2020-11-24 WO PCT/EP2020/083160 patent/WO2021110471A1/de unknown
- 2020-11-24 CN CN202080072828.1A patent/CN114631247A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2021110471A1 (de) | 2021-06-10 |
CN114631247A (zh) | 2022-06-14 |
US20230041078A1 (en) | 2023-02-09 |
EP3832852A1 (de) | 2021-06-09 |
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