WO2023036379A1 - Moteur à cc à commutation électronique - Google Patents

Moteur à cc à commutation électronique Download PDF

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Publication number
WO2023036379A1
WO2023036379A1 PCT/DE2022/200199 DE2022200199W WO2023036379A1 WO 2023036379 A1 WO2023036379 A1 WO 2023036379A1 DE 2022200199 W DE2022200199 W DE 2022200199W WO 2023036379 A1 WO2023036379 A1 WO 2023036379A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
elevation
electronically commutated
motor according
laminated core
Prior art date
Application number
PCT/DE2022/200199
Other languages
German (de)
English (en)
Inventor
Reiner HETTYCH
Jürgen Riess
Paul-Peter Golditz
Johann TRAUT
Markus Baumann
Original Assignee
Bühler Motor GmbH
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 Bühler Motor GmbH filed Critical Bühler Motor GmbH
Publication of WO2023036379A1 publication Critical patent/WO2023036379A1/fr

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
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations

Definitions

  • the invention relates to an electronically commutated DC motor according to the preamble of claim 1.
  • a generic electronically commutated DC motor comprises a wound stator, which has a laminated stator core and at least one insulating cap on the axial end faces. Furthermore, the electronically commutated DC motor includes a rotor, which is designed as a permanent magnet rotor and is mounted on a shaft. Such direct current motors are used, for example, in oil pumps in motor vehicles, where compact design and yet high and reliable performance are important.
  • stator and the rotor are accommodated within a preferably pot-shaped housing of the electronically commutated DC motor, with the rotor being arranged coaxially as an internal rotor within the fixed stator.
  • the position of the stator must not change when the motor is running.
  • stator In order to prevent the stator from changing its position at the starting torque of the motor or during vibration loads, it is secured in or on the housing by suitable Medium rotationally and axially fixed. It is known from the prior art to fasten the stator, for example, by gluing or overmoulding, which, however, entails increased effort and costs.
  • a non-positive connection is known, for example by pressing the stator into the housing.
  • this entails possible risks of causing damage, both during the connection process itself and afterwards. Examples include the formation of cracks, deformations or chip formation (and thus the risk of short circuits) due to the high exertion of force during pressing.
  • It is also known to heat the housing before the pressing process in such a way that it expands to a certain extent and pressing the stator into the housing is simplified. The subsequent, targeted and controlled cooling of the housing causes it to be shrunk onto the stator accordingly.
  • the tolerance sensitivity during the assembly process is fundamentally problematic, in particular due to the concentricity tolerance or concentricity fluctuations in the housing and stator.
  • stator has a very large diameter and the housing has a very small diameter (relative to the tolerance range), the effort required to push it in or press it in increases considerably, even with the heating described.
  • the object of the present invention is to propose an electronically commutated DC motor that is suitable for improved assembly of the stator in the housing while at the same time providing optimal rotational and axial fixation.
  • An electronically commutated DC motor with a housing includes a wound stator, which has a stator core and at least one insulating cap on the axial end faces, and a rotor, which is designed as a permanent magnet rotor and is mounted on a shaft.
  • the laminated core of the stator has at least one elevation in the radial direction on its outer peripheral surface.
  • stator is introduced into the housing with as little force as possible, regardless of the actual diameters of the stator and/or housing, more precisely also with unfavorable and/or very large or very small diameters of the stator or housing.
  • the housing is subsequently cooled in a targeted manner and forms an optimal connection with the stator.
  • a pressing process without shrinking is also conceivable.
  • the effort required is also reduced here.
  • Multiple elevations are preferably provided at multiple locations on the stator. Furthermore, the width of the elevations can preferably vary depending on the moment of force to be transmitted.
  • the at least one elevation is connected to the inside of the housing.
  • stator After the stator has been introduced into the housing, there is only contact between the laminated stator core and the housing at these elevations at corresponding points on the inside of the housing.
  • the other areas of the stator are not in contact with the housing and do not contribute to the bond.
  • the affected area is therefore smaller compared to the prior art and the risk of damage is reduced.
  • the at least one elevation is in a non-positive and/or positive connection with the housing. This advantageously prevents an unwanted rotation or change in movement in the radial and axial direction.
  • the elevations are preferably neither plastically nor elastically deformable, so that they retain their shape even when the stator is pressed into the housing.
  • these it is also conceivable to design these to be specifically elastic and plastically deformable (e.g. through the choice of material or shape) in order to ensure a desired local tensioning of the stator and housing at at least one elevation.
  • the laminated core of the stator is formed from a number of partial laminated cores, which comprise individual stator laminations.
  • two outer partial laminations can be provided, each with the same number of stator laminations, and between them an inner partial laminations with a different number of stator laminations.
  • the arrangements of the partial laminated cores and the stator laminations used can be varied as desired. This allows for a needs-based and alternating design of the partial laminated cores and stator laminations with regard to the dimensions and arrangement of individual laminations.
  • At least one partial laminated core has at least one elevation on the outer peripheral surface of the stator lamination and at least one partial laminated core has no elevation on the outer peripheral surface of the stator lamination.
  • the at least one elevation is not completely continuous in the axial direction; several elevations can be formed on one or more (or all) partial laminated cores in relation to the axial direction.
  • the at least one further partial laminated core can have no elevation and thus the same diameter as the rest of the stator (however, it would also be conceivable to provide indentations here instead).
  • at least one partial laminated core can be designed in such a way that it has the same length or level as the rest of the circumferential surface of the stator (except for the elevation). This allows any design and number of elevations in the axial direction.
  • this can be designed in such a way that no elevations in the axial direction have to be present on the end faces of the stator or of the laminated core of the stator, while there is an elevation in the middle of the laminated core of the stator.
  • stator laminations are stacked on top of one another to form partial laminations.
  • the partial laminated core stacks thus form elevations (or, analogously, no elevations or depressions) over the stator laminations of different lengths.
  • At least one stator lamination without elevation to form a first partial laminated core, at least one stator lamination with an elevation to form a second partial laminated core and at least one stator lamination without elevation to form a further partial laminated core are particularly advantageously stacked.
  • a partial laminated core (the arrangement of which in the laminated stator core or laminated core can be arbitrary) forms the elevation.
  • the configuration of the at least one elevation is not limited to this embodiment. Rather, different shapes are conceivable via the variable configuration and arrangement of the stator laminations.
  • the first partial laminated core is particularly preferably longer in the radial direction than the second partial laminated core.
  • the first partial laminated core thus forms the at least one elevation, while the second partial laminated core has the same circumference as the rest of the stator (without elevation) or a depression.
  • first partial laminated core (9) is preferably longer (wider, further, more pronounced) in the axial direction than the second partial laminated core (10).
  • first partial laminated core (9) is preferably longer (wider, further, more pronounced) in the axial direction than the second partial laminated core (10).
  • a partial laminated core as such already comprises a number of differently dimensioned stator laminates and thus a single partial laminated core forms several (or only a single) elevation.
  • a continuous increase is also conceivable, which extends over all the partial laminated cores.
  • the at least one elevation is in the form of a web.
  • other shapes such as round and/or (multi-)edged as well as clawed, spiked or other pointed shapes that form and express the elevations.
  • the width of the elevations in the radial direction can vary depending on the moment to be transmitted.
  • the at least one elevation is formed partially circumferentially on the outer peripheral surface of the laminated core of the stator (or a partial laminated core).
  • the elevations are formed over a longer section as viewed in the tangential direction, in addition to a possible selective arrangement of the elevations.
  • the elevations can be arranged on one or both of the outer peripheral surfaces.
  • the at least one elevation is partially circumferential and angularly offset in the tangential direction on the outer peripheral surface of the stator core (or a partial core).
  • One, several or all elevations can be arranged circumferentially (or selectively) and, for example, distributed at an angle of 120° (angular width) to one another. Other angles, such as 30°, are also possible and conceivable. It is also conceivable that individual elevations or partial laminated cores are offset with elevations in the axial direction to arrange taking into account a certain angular measure of the increases with each other.
  • the at least one elevation can preferably be arranged in the area of the at least one stator tooth.
  • a stator can usually comprise a plurality of stator teeth offset from one another, but preferably connected to one another. An offset arrangement of the elevations in relation to the stator teeth would also be conceivable.
  • the stator laminations are formed by stacking one on top of the other to form a laminated stator core with stator teeth formed thereon.
  • At least one stator lamination or a partial laminated core has at least one notch on its outer peripheral surface in the region of the at least one stator tooth (or offset).
  • Such notches can be realized by stacking the stator laminations accordingly and are relevant for the later alignment when winding the stator.
  • the stator is pressed into the housing by means of a thermal process, preferably shrinking.
  • a thermal process preferably shrinking.
  • a further advantage of the present invention is that the overpressing increases over the service life of the stamping tool used or the deep-drawing tool used for the housing. Accordingly, due to the higher overpressing over the laminated core of the stator, the press fit can be reduced.
  • the invention is particularly suitable for use in BLDC motors, ie brushless direct current motors.
  • the invention is suitable for use in brushless DC motors for driving pumps Oil production, but also for the promotion of other viscous media.
  • a particularly advantageous application is for brushless direct current motors in oil pumps in motor vehicles, in particular in a temperature range from -40.degree. C. to +140.degree.
  • FIG. 1 shows a perspective view of an electronically commutated DC motor according to one embodiment
  • FIG. 2 shows a perspective view of a stator according to an embodiment
  • FIG. 3 shows a detailed view of the stator according to FIG. 2;
  • FIG. 4 shows a detailed view of a stator tooth of the stator according to FIG. 2;
  • FIG. 5 shows a detailed view of the stator within a housing of the electronically commutated DC motor according to one embodiment.
  • An electronically commutated DC motor (5) with a housing (1) comprises a wound stator (2) which has an insulating cap (4) for electrical insulation on at least one axial end face. However, it is also possible to provide an insulating cap (4) on both axial end faces.
  • the housing also includes a rotor (6) which is designed as a permanent magnet rotor and is mounted on a shaft (7).
  • the stator (2) is introduced into the housing (1) by means of shrinking or pressing, for example, and can thus be fixed radially and axially in a rotationally fixed manner.
  • FIG. 2 shows a perspective view of a stator (2) according to an embodiment.
  • the stator (2) comprises a large number of stator teeth (13) and also comprises at least one stator laminated core (3), which in the exemplary embodiment is formed from a first (9) and a second (10) partial laminated core, with a second partial laminated core (10) is arranged on the end faces of the stator (2).
  • the first partial laminated core (9), on the other hand, is arranged in the middle, ie between the two second partial laminated cores (10).
  • the first partial laminated core forms (9) an increase (8) in the form of a web (12).
  • Many variants of different arrangements of partial laminated cores (9, 10) are possible and not limited to this embodiment.
  • the second partial laminated core (10) can only be provided on one end face of the stator (2).
  • the partial laminated cores (9, 10) comprise at least one stator laminate (11), but preferably a multiplicity of stator laminates (11) stacked on top of one another.
  • the laminated core (3) of the stator has at least one elevation (8) in the radial direction on its outer peripheral surface (arranged offset by 90° to the end face of the stator).
  • the laminated core (9) is longer than the two peripheral laminated cores (10) and a central elevation (8) is thus formed.
  • this can also be configured exactly the other way around, so that an elevation (8) is formed on one or both outer sides.
  • a notch (14) facilitates the subsequent winding process.
  • the stator laminations (11) can be designed in different lengths in order to form the final elevations (8) on the stator laminations (3) or on the partial laminations (9, 10). This can be seen in more detail in FIG. 3, which shows a detailed view of the stator (2) according to FIG. Individual stator laminations (11) can also form alternating elevations, independently of the partial laminations (9, 10). In other words, the laminated core (3) of the stator can have an overall area with different pronounced elevations (8).
  • the partial laminated cores (9, 10) or the areas that have the elevations (8) can be formed circumferentially, in particular partially circumferentially, on the outer peripheral surface of the stator laminated core (3).
  • the elevations (8) can preferably be arranged offset from one another in different angular dimensions, in the example 120° angular width.
  • each stator tooth (13) has an elevation (8) on its outer peripheral surface, preferably arranged centrally (offset centrally arranged elevations on the stator tooth would of course also be possible).
  • FIG. 4 shows a detailed view of a stator tooth (13) of the stator according to FIG. 2.
  • the elevation (8) in the middle of the stator tooth in the form of a web (12) can be seen.
  • the elevation (8) can also be offset from the center.
  • the webs (12) or the elevation (8) facilitate the introduction of the stator (2) into the housing (1) by forming a shrinking contour.
  • the stator (2) is in contact with the inside of the housing (1) via the elevations (8), preferably in a non-positive and/or positive connection. This would also be the case with a press-in operation without shrinking. A force-free or at least force-reduced insertion is possible with a simultaneous increased insensitivity to tolerances. Only at these raised points is there contact between the stator (2) and the housing (1) after the housing (1) has cooled down after the shrinking process. The other areas of the stator (2) are not in contact with the housing (1) and do not contribute to the composite.
  • Such a connection between the stator (2) or web (12) or elevation (8) on the stator tooth (13) and the housing (1) is shown in more detail in FIG.
  • the invention is not limited to the exemplary embodiments mentioned. Rather, all design variants that can be implemented within the framework of professional activity and minor professional changes are included.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention se rapporte à un moteur à CC à commutation électronique comprenant un boîtier ; un stator de bobine comportant un noyau de stator stratifié et au moins un couvercle d'isolation sur les faces d'extrémité axiale ; et un rotor qui est conçu sous la forme d'un rotor à aimant permanent et qui est monté sur un arbre. Le noyau de stator stratifié présente au moins une partie saillante dans la direction radiale sur sa surface circonférentielle extérieure.
PCT/DE2022/200199 2021-09-10 2022-09-01 Moteur à cc à commutation électronique WO2023036379A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021123463.8A DE102021123463A1 (de) 2021-09-10 2021-09-10 Elektronisch kommutierter Gleichstrommotor
DEDE102021123463.8 2021-09-10

Publications (1)

Publication Number Publication Date
WO2023036379A1 true WO2023036379A1 (fr) 2023-03-16

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ID=83361179

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PCT/DE2022/200199 WO2023036379A1 (fr) 2021-09-10 2022-09-01 Moteur à cc à commutation électronique

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DE (1) DE102021123463A1 (fr)
WO (1) WO2023036379A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209796A2 (fr) * 2000-11-21 2002-05-29 Nissan Motor Co., Ltd. Machine électrique rotative
DE102015204929A1 (de) * 2015-03-19 2016-09-22 Schaeffler Technologies AG & Co. KG Elektromotor mit Presspassung
EP3232541A1 (fr) * 2016-04-15 2017-10-18 Bühler Motor GmbH Moteur électrique, en particulier moteur de pompe
DE102016216773A1 (de) * 2016-09-05 2018-03-08 Continental Automotive Gmbh Rotorblechpaket und Statorblechpaket für eine elektrische Maschine
DE102019204681A1 (de) * 2019-04-02 2020-10-08 Volkswagen Aktiengesellschaft Elektrische Maschine
DE102019129822A1 (de) * 2019-11-05 2021-05-06 Metabowerke Gmbh Vorrichtung zur Anordnung eines Stators in einem Gehäuse eines Elektromotors

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008064131A1 (de) 2008-03-05 2009-09-24 Minebea Co., Ltd. Elektrische Maschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209796A2 (fr) * 2000-11-21 2002-05-29 Nissan Motor Co., Ltd. Machine électrique rotative
DE102015204929A1 (de) * 2015-03-19 2016-09-22 Schaeffler Technologies AG & Co. KG Elektromotor mit Presspassung
EP3232541A1 (fr) * 2016-04-15 2017-10-18 Bühler Motor GmbH Moteur électrique, en particulier moteur de pompe
DE102016216773A1 (de) * 2016-09-05 2018-03-08 Continental Automotive Gmbh Rotorblechpaket und Statorblechpaket für eine elektrische Maschine
DE102019204681A1 (de) * 2019-04-02 2020-10-08 Volkswagen Aktiengesellschaft Elektrische Maschine
DE102019129822A1 (de) * 2019-11-05 2021-05-06 Metabowerke Gmbh Vorrichtung zur Anordnung eines Stators in einem Gehäuse eines Elektromotors

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Publication number Publication date
DE102021123463A1 (de) 2023-03-16

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