WO2013120570A2

WO2013120570A2 - Stator mount for an electric machine

Info

Publication number: WO2013120570A2
Application number: PCT/EP2013/000052
Authority: WO
Inventors: Werner König; Rainer SIGLE
Original assignee: Daimler Ag
Priority date: 2012-02-16
Filing date: 2013-01-10
Publication date: 2013-08-22
Also published as: DE102012003101A1; WO2013120570A3

Abstract

The invention relates to a stator mount for holding at least one stator element (16) of an electric machine (10), comprising at least one holding region (28), in which the at least one stator element (16) can be fastened to the stator mount (18), and comprising at least one fastening region (22, 24), via which the stator mount (18) can be fastened to a housing part (20) of the electric machine (10), wherein the holding region (28) and the fastening region (22, 24) are connected to one another via a vibration decoupling structure (38) of the stator mount (18).

Description

Stator carrier for an electric machine

The invention relates to a stator for an electric machine according to the preamble of claim 1.

Such a stator support can be found, for example, in DE 10 2009 020 613 A1 as known. The stator carrier serves to hold stator elements of a stator of an electric machine. The stator includes, for example, segmented, i. separate

Stator elements, which are held together by the stator to a ring. Here, the stator support the cohesion of the stator elements per se, for example by pressing, generate or support the already assembled stator. For this purpose, the stator carrier has at least one holding region, in which the stator elements can be fastened to the stator carrier and thereby on

Stator are held.

The stator carrier is used in particular to support the stator relative to a housing of the electric machine. In this case, the stator itself may be a housing part of the housing. The stator can be supported on the stator and thereby experiences a counter-torque, so that a rotor of the electric machine can rotate relative to the stator. For connecting the stator carrier to the housing or to another housing part of the electric machine, the stator carrier has at least one

Attachment area, via which the stator is fastened to the housing or to another housing part of the housing.

To drive the rotor, the stator is energized. The energization causes magnetic forces in the stator. In particular, due to alternating fields in the stator it comes to a vibrational excitation, resulting in noticeable and unpleasant noise can result. In a motor vehicle, the vibrations may propagate to the passenger compartment and be perceived by occupants of the passenger compartment. This affects the ride comfort of the motor vehicle.

It is therefore an object of the present invention to develop a stator of the type mentioned in such a way that the stator is a particularly

advantageous noise behavior of the electric machine allows.

This object is achieved by a stator with the features of claim 1. Advantageous embodiments with appropriate and non-trivial

Further developments of the invention are specified in the remaining claims.

To keep noise due to the above-described vibration excitations particularly low or avoid, the invention provides that the

Holding region and the mounting portion are connected to each other via a vibration isolation structure of the stator. By means of

Vibration decoupling structure, the holding portion of the attachment region is at least substantially vibration decoupled, so that a

Vibration transmission due to the vibration excitations from the holding region of the stator via its mounting area in the housing or the housing part is avoided or takes place only to a very limited extent.

The vibration decoupling structure damps outgoing from the holding area and originating from the stator vibrations, so that a forwarding over the

Mounting area and, for example, to the passenger compartment of a motor vehicle, especially a passenger car, is avoided or can take place only to a very limited extent. As a result, passengers of the passenger compartment from the vibrations resulting noise at least substantially not perceive, resulting in a very high ride comfort.

The stator support according to the invention is therefore particularly advantageously usable in an electric machine for a motor vehicle designed as a hybrid vehicle or electric vehicle, which can be driven at least in a supportive manner by means of the electric machine. Thus, a very high ride comfort can be realized for occupants of the motor vehicle.

The vibration decoupling structure preferably comprises a plurality of juxtaposed recesses and / or passage openings at least a wall of the stator carrier. In this case, the stator is, for example perforated and / or otherwise structured broken. This is a geometry of the

Statorträgers created, whereby this in the region of the recesses and / or passage openings against adjoining areas of the

Stator carrier has a lower rigidity.

In other words, the stator is through the recesses and / or

Passages specifically weakened, whereby the vibrations are damped. Depending on the design and / or arrangement of the geometry with less rigidity, the stator carrier can be different in different directions or axes

Have stiffness. As a result, the vibration decoupling capability of the vibration decoupling structure can be formed as required and targeted, so that the stator carrier, for example, in a first direction, a relatively small

Stiffness for damping the vibrations and in a different, second direction has a higher rigidity for realizing a fixed connection of the stator on the housing part.

In a particularly advantageous embodiment of the invention, the holding region and the attachment region are formed integrally with each other. In other words, the stator is integrally formed. As a result, the stator is particularly inexpensive to produce. The stator can thereby by means of a deep drawing process, pressing process, casting process, extrusion process or by means of a

be prepared by other manufacturing method.

The vibration decoupling structure can be produced during the manufacturing process, for example, simultaneously with a forming process and / or a primary molding process.

If the stator carrier is produced, for example, by means of a casting method, then the vibration decoupling structure can be replaced by a corresponding design

Mold are made, wherein the vibration isolation structure is formed in the casting and curing of the stator carrier at this.

Alternatively or additionally, it is possible to produce the vibration decoupling structure at least partially in a subsequent process step to the corresponding manufacturing process and to the already produced stator for example, by drilling and / or otherwise, form spannabhebendes method.

In this way, the vibration decoupling structure without a material change or material difference and without connection work can be produced. In other words, therefore, no other material is provided and required for producing the vibration decoupling structure than for producing the holding region and the fastening region.

The particular one-piece stator is preferably formed of a metallic material, but may be made of a different material. The stator according to the invention is suitable for both internal rotor electrical machines and external rotor electrical machines.

In a further advantageous embodiment, the holding region and the fastening region are spaced apart in the axial direction of the stator carrier. It is the

Vibration decoupling structure arranged in the axial direction between the holding portion and the mounting portion. This is a particularly advantageous

Vibration decoupling realized.

The described integration of the vibration decoupling structure in the stator, in particular due to the one-piece design of the stator, also has the advantage that by means of the stator carrier according to the invention a particularly strong

Connection of the stator on the housing part of the electric machine can be realized. When using damping material and / or damping on or on

Fasteners for securing the stator support to the housing part of

Electric machine can lead to a structural weakening of the connection between the stator and the housing part. This problem is avoided by the stator according to the invention.

The stator according to the invention also allows a space and

low-weight connection to the housing part of the electric machine because

Material accumulations in the region of the connection with the housing part are not provided and are not required to dampen the vibrations or a

To reduce or avoid vibration transmission. Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. The features mentioned above in the description and

Feature combinations as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination but also in others

Combinations or alone, without departing from the scope of the invention.

The drawing shows in:

Fig. 1 in fragmentary form a schematic longitudinal sectional view of a

Electric machine with a rotor and with a stator, which is fastened via a stator to a housing part of the electric machine, wherein the stator has a vibration decoupling structure, by means of which a transmission of vibrations from the stator to the housing is kept at least low;

Fig. 2 is a schematic perspective view of an embodiment of the

Statorträgers the electric machine of FIG. 1;

Fig. 3 is a schematic perspective view of another embodiment of the

Statorträgers of FIG. 2; and

4 is a schematic perspective view of another embodiment of the invention

Statorträgers according to FIGS. 2 and 3.

Fig. 1 shows an electric machine 10 for a trained example as a passenger cars cars. The electric machine 10 may be integrated in a transmission of the motor vehicle and serve to drive the motor vehicle via the gearbox electric motor and thus emission-free. The electric machine 10 can also serve, for example, to start a combustion engine of the motor vehicle, for example designed as a reciprocating internal combustion engine and coupled or coupleable to the transmission, and thus to assume the function of a starter. The electric machine 10 comprises a rotor 12 and a rotor carrier 14, to which the rotor 12 is attached. In this case, the rotor 12 is a plurality of individual

Rotor segments include, which are interconnected by means of the rotor carrier 14.

The electric machine 10 also includes a stator 16, which in the present case a

Includes stator core with individual stator segments. The stator 16 with the

Stator segments is attached to a stator 18 of the electric machine 10.

The stator support 18 is fixed to a housing 20 of the electric machine 10. For this purpose, the stator support 18 on two mounting portions 22, 24, which are spaced apart in the axial direction of the stator support 18 and the electric machine 10. The stator support 18 is fastened to the housing 20 via its attachment regions 22, 24. As a result, the stator carrier 18 is supported on the housing 20 and can provide a counter-moment for the rotor 12, so that when the stator 16 is energized, the rotor 12 with the rotor carrier 14 can rotate about an axis of rotation 26 relative to the stator carrier 18 and relative to the housing 20.

In the present case, the stator support 18 is connected to the housing 20 via a respective clamping by at least one oblique edge in the attachment areas 22, 24, i. jammed with the housing 20.

Alternatively or additionally, the stator carrier 18 in its attachment regions 22, 24, for example, also have screw-on straps, via which the stator carrier 18 is screwed to the housing 20. Alternatively or additionally, the stator support 18 may also be connected to the housing 20 by caulking, gluing, welding and / or otherwise.

For holding the stator 16, the stator support 18 has a holding region 28, which is arranged in the axial direction between the attachment regions 22, 24. In other words, the attachment regions 22, 24 in the axial direction in each case outwardly adjoin the holding region 28.

In this case, the attachment regions 22, 24 are integrally formed with the holding region 28. As a result of this one-piece design of the stator support 18 this is particularly inexpensive to produce. For cooling the stator support 18 and via this the stator 16, a cooling jacket 30 is provided. The cooling jacket 30 is formed by a cooling region 32 of the stator carrier 18 and the housing 20. In the cooling region 32, which is arranged in the radial direction in overlap with the holding region 28 and thus in register with the stator 16, the stator carrier 18 is spaced from the housing 20 in the radial direction. As a result, by means of the stator support 18 and the housing 20 a

Cooling channel 34 is limited, which in the circumferential direction completely, i.

extends interruption over the stator support 18 on a side facing away from the holding portion 28. The cooling channel 34 can be flowed through by a coolant, for example cooling air or a cooling liquid, and thus ensure efficient heat removal from the stator support 18.

As can be seen in particular in conjunction with FIGS. 2 to 4, the stator carrier 18 is formed from a single-walled metal and has in the cooling region 32

Outside circumferential cooling grooves 36 on.

Based on the axial direction of the stator support 18 is slightly conical, so that the stator 18 can be introduced with the stator 16 in a simple manner in the housing 20 and clamped in a predeterminable by the conical configuration and defined position with the housing 20. Subsequently, the stator support 18 is secured in position with the stator 16 by means of a clamping device 37.

By energizing the stator 16 during operation of the electric machine 10, it may

Vibratory excitations of the stator 16 and thus of the stator 18 come. In order to avoid or to keep particularly low vibration transmission from the stator 16 via the stator support 18 and the housing 20 into a passenger compartment of the motor vehicle, respective vibration decoupling structures 38 are provided, via which the retaining area 28 is connected to the respective fastening areas 22, 24. In other words, the respective vibration decoupling structures 38 are disposed in the axial direction between the holding portion 28 and the attachment portions 22, 24.

As can be seen in conjunction with FIGS. 2 to 4, the respective one comprises

Vibration decoupling structure 38 a plurality of openings or

Through openings 40, which penetrate the stator support 18 and its wall. The passage openings 40 are in the circumferential direction of the stator 18

arranged side by side or one behind the other and in the circumferential direction of respective Webs 42 of the stator 18 limited. This means that the connection of the holding region 28 with the attachment regions 22, 24 takes place only via the relatively narrow webs 42. Furthermore, this means that the through-openings 40 minimizes a mechanical or material connection between the holding region 28 and the fastening regions 22, 24 formed integrally therewith. As a result, the stator support 18 is deliberately weakened, whereby the vibrations due to the energization of the stator 16 are at least partially damped and a transfer of these from the holding portion 28 on the mounting portions 22, 24 is kept at least very low or avoided.

However, the connection of the holding portion 28 with the mounting portions 22, 24 is still strong enough to support the stator 16 and to ensure the torque support for the rotor 12 without causing damage to the load and / or

Fatigue comes.

The vibration decoupling structures 38 or one of them can basically everywhere in the axial direction between the holding portion 28 and the mounting portions 22, 24 and thus also in radial overlap with the stator 16 on the stator 18

be provided so that the vibrations emanating from the stator 16 are damped.

In the present case, the vibration decoupling structures 38 are arranged outside the cooling region 32, so that a particularly large-area and uninterrupted cooling of the stator carrier and thus of the stator 16 is possible.

For sealing the cooling jacket 30, for example, respective sealing elements, in particular sealing rings, are provided which extend laterally in the axial direction

Holding region 28 are arranged. Preferably, the

Vibration decoupling structures 38 also outside the sealing elements, i. arranged cover-free to the cover elements, so that a particularly advantageous tightness of the cooling jacket 30 is realized.

The effective and efficient cooling of the stator carrier 18 and thus of the stator 16 is particularly beneficial in that the attachment regions 22, 24 adjoin the holding region 28 in the axial direction to the outside. This allows the

Cooling area 32 may be formed over a particularly large area, so that the coolant Centrally or centrally between the mounting portions 22, 24 arranged stator 16 advantageously flow around and can dissipate heat therefrom.

The jamming of the stator carrier 18 with the housing 20 can be realized by a respective thickening, wherein the respective vibration decoupling structure 38 can also be arranged on the thickening.

As can be seen from FIG. 2, the passage openings 40 can be formed in the circumferential direction as elongated slots, which are delimited by particularly narrow webs 42 in the circumferential direction.

According to FIG. 3, the passage openings 40 are at least substantially circular and form a perforation of the one-piece stator carrier 18.

4, the through holes 40 are also formed as elongated slots in the circumferential direction. However, the webs 42 delimiting the through-opening 40 are wider than the webs 42 according to FIG. 2. Furthermore, the stator carrier 18 according to FIG. 4 has only one vibration-decoupling structure 38 between the holding region 28 and the fastening region 22.

Thus, it is possible to design the vibration decoupling structures 38 as needed and thus, on the one hand, a vibration decoupling of the

Attachment areas 22, 24 from the holding portion 28 and on the other hand, a fixed

To allow connection of the stator 16 on the housing 20.

Depending on the design and arrangement of the vibration decoupling structures 38, they can have different stiffnesses in different directions and can thus be adapted to the respective requirements as needed. LIST OF REFERENCE NUMBERS

10 electric machine

12 rotor

14 rotor carrier

16 stator

18 stator carrier

20 housing

22 mounting area

24 mounting area

26 axis of rotation

28 holding area

30 cooling jacket

32 Cooling area

34 cooling channel

36 cooling grooves

37 Clamping device

38 vibration decoupling structure

40 passage opening

42 footbridge

Claims

claims

A stator support for holding at least one stator element of a stator (16) of an electric machine (10) having at least one support portion (28) in which the at least one stator element of the stator (16) is attachable to the stator support (18) and having at least one attachment portion (22, 24), about which the

Statorträger (18) on a housing part (20) of the electric machine (10) can be fastened,

characterized in that

the holding area (28) and the attachment area (22, 24) via a

Vibration decoupling structure (38) of the stator (18) are interconnected.

2. Statorträger according to claim 1,

characterized in that

the vibration decoupling structure (38) at least one recess and / or at least one passage opening (40) of at least one wall of the

Stator carrier (18) includes.

3. stator according to claim 2,

characterized in that

the vibration decoupling structure (38) comprises a plurality of juxtaposed recesses and / or passage openings (40) of the at least one wall.

4. stator according to one of the preceding claims,

characterized in that the holding region (28) and the attachment region (22, 24) are formed integrally with each other.

5. stator according to one of the preceding claims,

characterized in that

the holding region (28) and the fastening region (22, 24) are spaced apart in the axial direction of the stator carrier (18).

6. stator according to one of the preceding claims,

characterized in that

the stator carrier (18) has at least one cooling region (32) over which the stator carrier (18) and above it the stator (16) is to be cooled, wherein the

Vibration decoupling structure (38) outside the cooling region (32) is arranged.

7. stator according to claim 6,

characterized in that

the cooling region (32) is arranged in at least partial overlap with the holding region (28).

8. Electric machine (10) with a stator (18) according to one of the preceding claims.