DE102018205106A1 - Rotor for an electric machine with integrated radial and axial vibration damper - Google Patents

Abstract

The invention relates to a rotor (10) for arrangement in an electric machine, having a hollow-cylindrical laminated core (12), on whose outer peripheral surface (16) a rotor core (14) can be arranged, and to the respective axial end (18) of the laminated core (12) each having an end flange (20) is arranged, wherein the respective end flange (20) has a shaft journal (22) for supporting the rotor (10), and in the hollow cylinder shaped laminated core (12) a radial vibration damper (26) and an axial vibration damper (28) is arranged and / or formed.

Description

The invention relates to a rotor for arrangement in an electric machine, wherein the rotor has an integrated axial vibration damper and integrated radial vibration damper. The invention also relates to an electrical machine with the rotor according to the invention.

Electric machines with a rotor are well known. The known electrical machines generally have a stator and a rotatable in the stator about a rotor axis rotatable rotor.

Furthermore, it is known that continuously bending vibrations can occur during operation in the rotor shaft of the rotor. Causes can be mainly major changes in shaft speed during acceleration and braking. Likewise, however, an imbalance of the rotor can trigger bending vibrations. Therefore, rotors with a vibration damper are also known in order to avoid or reduce dangerous torsional vibrations in the rotatable shaft of the electric machine during a start-up operation, a deployment operation or during normal operation of the electrical machine.

Furthermore, it is not excluded that in addition to bending vibrations and vibrations in the axial direction of the rotor may occur, which may have adverse effects on the electric machine or on a motor vehicle.

From the US 2010/0225121 A1 For example, a rotary electric machine is known in which a torsional vibration damper is integrated in the rotating electric machine. The electric machine has a rotor core with a first end and a second end. The integrated torsional vibration damper consists of a torsionally flexible coupling and a torsion damper and provides a mechanical damping. The integrated torsional vibration damper is attached to the rotary shaft of the electric machine by a flange. The rotor lamination stack is attached to the first end to the integrated torsional vibration damper by suitable structural members, such as a mounting flange, and is not fixedly attached directly to the rotatable shaft.

A disadvantage of the known rotor or the known electric machine is the increased space requirement in the axial direction, since the torsional vibration damper is flanged in the axial direction on the rotor core and thus requires a correspondingly large space in the longitudinal direction of the electric machine.

It is the object of the present invention to provide a rotor for an electric machine with increased running characteristics, which has a reduced space requirement.

The object is solved by the subject matter of the independent patent claim. Advantageous embodiments of the invention are set forth in the dependent claims, the description and the drawings, wherein each feature, both individually and in combination, may constitute an aspect of the invention.

According to the invention, a rotor is provided for arrangement in an electric machine, with a hollow cylinder-shaped laminated core, on the outer peripheral surface of a rotor laminated core can be arranged, and at the respective axial end of the laminated core carrier each a front flange is arranged, wherein the respective end flange a shaft journal for supporting the Rotor, and in the hollow cylindrical shaped laminated core carrier a radial vibration damper and an axial vibration damper is arranged and / or formed.

In other words, it is an aspect of the invention to provide a rotor for an electric machine having a hollow cylindrical shaped laminated core. This can be, for example, a hollow rotor shaft. At least one rotor core can be arranged and / or arranged on the laminated core carrier. Thus, the rotor laminated core can preferably be arranged rotationally fixed on the laminated core and transmit a torque to the laminated core. At the respective axial ends of the laminated core carrier an end flange is arranged, wherein each end flange has a shaft journal, which is generally formed coaxially to the rotor axis of rotation.

The radial vibration damper and the axial vibration damper are arranged within the hollow-cylindrical shaped laminated core carrier, or the hollow rotor shaft. About the radial vibration damper vibration, which preferably act substantially perpendicular to the rotor axis of the rotor, are damped. About the axial vibration damper shocks and / or vibrations, which preferably act substantially parallel to the longitudinal direction or rotor axis of the rotor can be reduced. The Radialschwingungstilger and Axialschwingungstilger act directly on the rotor or on the hollow rotor shaft, so that the Radialschwingungstilger and the Axialschwingungstilger reduce unwanted vibrations and / or noise at the place of origin and thus can positively influence the operating characteristics of the rotor. The vibrations causing the vibrations of the rotor can on the Radial vibration damper and / or the Axialschwingungstilger be transmitted. The design of the radial vibration absorber and / or the Axialschwingungstilgers is preferably tuned to the frequencies that may occur during operation of the rotor. These can preferably be determined in advance by simulations and / or tests. In this way, a rotor is provided with an integrated radial vibration damper and integrated axial vibration damper, which can have a reduced space and increased operating characteristics. In addition to the space-saving design, the manufacturing costs can also be reduced. In addition, the life and / or reliability of the rotor or the electric machine can be increased.

A radial vibration damper and / or an axial vibration damper is to be understood as a vibration-capable mass-spring damping system which can fundamentally be designed differently.

An advantageous development of the invention provides that the radial vibration damper comprises a rubber-elastic element with at least one arranged and / or embedded in the rubber-elastic element first absorber mass. The rubber-elastic element is preferably an elastomer, in particular a silicone elastomer, and most preferably a vulcanized silicone elastomer. Silicone elastomers are suitable and designed to convert vibration energy into heat. The first absorber mass can be designed as desired. As a rule, the first absorber mass has a higher density than the rubber-elastic element. Preferably, the first absorber mass is formed as a metal core, but this is not limited exclusively to a metal core. The advantage of a metal core is that it is easy and inexpensive to produce.

In an advantageous development of the invention, it is provided that the first absorber mass is held within the elastomeric element in the axial direction of the rotor and in the radial direction of the rotor, wherein the rubber-elastic element at least partially oscillate in the radial direction as a result of rotation of the rotor about its axis of rotation can, and the first absorber mass oscillates in the radial direction. This means that the first absorber mass is positioned in the radial direction and in the axial direction within the rubber-elastic element. The first absorber mass acts within the rubber-elastic element as a vibrating mass and the rubber-elastic element takes over the function of the spring and the damper. Unwanted oscillations of the rotor as a result of its rotation stimulate the first absorber mass to oscillate in the radial direction. By depriving the first absorber mass of the stimulating vibration energy, the vibration is dampened.

The first absorber mass can be connected in different ways with the rubber-elastic element. A preferred embodiment of the invention provides that the first absorber mass is arranged cohesively and / or positively in the rubber-elastic element. For example, the first absorber mass and the rubber-elastic element may be vulcanized together, pressed together and / or glued together. In this way, the first absorber mass can be positioned or fastened in the rubber-elastic element.

In an advantageous development of the invention it is provided that the first absorber mass is arranged centrally in the longitudinal direction of the laminated core, this does not mean that the first absorber mass is located on the rotor axis of rotation. Rather, the first absorber mass is arranged in the radial direction at a distance from the rotor axis of rotation.

A preferred embodiment of the invention is that the radial vibration damper in a longitudinal section through the rotor has a rectilinear configuration, and is clamped between the end flanges. In this way, the radial vibration damper is preferably arranged coaxially in the laminated core and is clamped between the end flanges. In the radial direction, the radial vibration damper over its entire length at a distance from the inner circumferential surface of the laminated core, so that the first absorber mass can oscillate in the radial direction.

Alternatively, a preferred embodiment of the invention provides that the radial vibration damper in a longitudinal section through the rotor has a dumbbell-shaped configuration. Accordingly, the radial vibration damper between the respective end portions on a central portion which comprises a reduced outer diameter relative to the respective end portions. The end portions of the Radialschwingungstilgers are based at least in sections against the inner circumferential surface of the laminated core carrier, whereby the Radialschwingungstilger is positionally positionable in the laminated core carrier. The middle portion is formed so that it can swing in the radial direction. Accordingly, the first absorber mass is arranged in the middle section.

An advantageous development of the invention provides that the radial vibration absorber is arranged cohesively and / or positively in the laminated core and / or is connected to an inner circumferential surface of the laminated core carrier. A cohesive connection is preferred an adhesive bond. Under a positive connection is to be understood that the rubber-elastic element is clamped to the laminated core and / or the end flanges and thus fixed in position.

According to a preferred embodiment of the invention, it is provided that the axial vibration damper comprises a guide sleeve extending coaxially within the rubber-elastic element to the shaft journal, in which a second absorber mass can be displaced in the axial direction against damping elements. The second absorber mass is thus arranged between the damping elements within the guide sleeve, so that the axial ends of the second absorber mass act against the respective damping element adjacent thereto. Thus, the Axialschwingungsdämpfer is designed as a spring-mass damping system, wherein the damping elements take over the spring and / or damping and the second absorber mass is the oscillating mass. Impacts or vibrations that act on the rotor substantially in the axial direction can be compensated and / or reduced by the axial vibration damper, with the impact and / or vibration energy being absorbed by the axial vibration damper.

The second absorber mass can be a metal core in analogy to the first absorber mass, wherein the second absorber mass is not limited to the metal core. A Tilgermasse in the form of a metal core is inexpensive to produce.

An advantageous development of the invention lies in the fact that the guide sleeve is connected to the rubber-elastic element cohesively and / or non-positively. Preferably, the rubber-elastic element may be vulcanized to the guide sleeve. It is also conceivable that the guide sleeve is pressed into the rubber-elastic element. Alternatively and / or in addition, it can be provided that the guide sleeve is glued to the rubber-elastic element.

In this way, the rubber-elastic element can be securely connected to the guide sleeve.

At this point it should be noted that the rubber-elastic element is designed such that, despite the connection of the rubber-elastic element to the guide sleeve, the first absorber mass can oscillate in the radial direction.

The invention also relates to an electric machine with the rotor according to the invention, wherein the rotor is at least partially surrounded by a stator.

Further features and advantages of the present invention will become apparent from the dependent claims and the following embodiments. The embodiments are not limiting, but rather to be understood as exemplary, they should enable the skilled person to carry out the invention. The Applicant reserves the right to make individual or several of the features disclosed in the exemplary embodiments the subject matter of patent claims or to include such features in existing claims. The embodiments are explained in more detail with reference to drawings.

• 1 einen Längsschnitt durch einen Rotor mit einem integrierten Radialschwingungstilger und integrierten Axialschwingungstilger, wobei der Radialschwingungstilger einen geradlinigen Verlauf aufweist,
• 2 einen Längsschnitt durch einen Rotor mit einem integrierten Radialschwingungstilger und integrierten Axialschwingungstilger, wobei der Radialschwingungstilger eine hantelförmige Ausgestaltung aufweist.

In these show:

• 1 a longitudinal section through a rotor with an integrated radial vibration damper and integrated axial vibration damper, wherein the radial vibration damper has a straight course,
• 2 a longitudinal section through a rotor with an integrated radial vibration damper and integrated axial vibration damper, wherein the radial vibration damper has a dumbbell-shaped configuration.

In 1 is a rotor 10 shown for an electric machine. The rotor 10 has a hollow cylindrical shaped laminated core 12 on. The laminated box carrier 12 may be, for example, a hollow rotor shaft. The laminated box carrier 12 preferably has an inner diameter of> 30 mm. On the laminated box carrier 12 is a rotor core 14 arranged. The rotor core 14 is preferably rotationally fixed on the laminated core 12 attached. This means that the rotor core 14 at least in sections on an outer peripheral surface 16 of the laminated core carrier 12 is present and / or preferably non-positively, frictionally and / or materially connected thereto. Thus, a rotational movement and / or a torque of the rotor core can 14 on the laminated core 12 be transmitted.

At the respective axial ends 18 of the laminated core carrier 12 is a front flange 20 arranged, with each end flange 20 a shaft journal 22 having, coaxial with the rotor axis of rotation 24 is trained. Within the hollow cylindrical shaped laminated core carrier 12 or the hollow rotor shaft are a radial vibration damper 26 and an axial vibration damper 28 arranged.

The radial vibration damper 26 and the axial vibration damper 28 are thus inside the rotor 10 or the laminated core carrier 12 arranged and thus formed integrated. In this way, a rotor 10 with an integrated radial vibration damper 26 and an integrated Axialschwingungstilger 28 provided, which may have a reduced space and increased operating characteristics. In addition to the space-saving design of the rotor 10 In addition, the production costs can be reduced.

The radial vibration damper 26 is a vibratory mass-spring damping system. It is provided that the radial vibration damper 26 a rubber-elastic element 30 with at least one in the rubber-elastic element 30 arranged and / or embedded first absorber mass 32 includes. The rubber-elastic element 30 is a silicone elastomer. Silicone elastomers are suitable and designed to convert vibration energy into heat. The first absorber mass 32 is formed in the present embodiment as a metal core. The advantage of a metal core is that it is simple and inexpensive to produce and has a higher density compared to the silicone elastomer.

The first absorber mass 32 is inside the rubber elastic element 30 in the axial direction of the rotor 10 and in the radial direction of the rotor 10 held, with the rubber-elastic element 30 in consequence of a rotation of the rotor 10 around its rotor axis of rotation 24 at least in sections in the radial direction 33 can swing, and the first absorber mass 32 in the radial direction 33 swings. This means that the first absorber mass 32 within the laminated core carrier 12 in the radial direction and in the axial direction within the rubber-elastic element 30 is positioned. The first absorber mass 32 acts within the rubber-elastic element 30 as a vibrating mass and the rubber-elastic element 30 takes over the function of the spring and the damper. Unwanted vibrations of the rotor 10 as a result of its rotation, rain the first absorber mass 32 to vibrations in the radial direction 33 at. In which the first absorber mass 32 the exciting vibration withdraws energy, the vibration is damped.

The first absorber mass 32 is in the longitudinal direction of the laminated core carrier 12 centered, this does not mean that the first absorber mass 32 on the rotor axis of rotation 24 lies. Rather, the first absorber mass 32 spaced in the radial direction to the rotor axis of rotation 24 arranged. In the present embodiment, the first absorber mass 32 arranged radially inward.

The first absorber mass 32 is with the rubber-elastic element 30 glued so that these firmly or captive with the rubber-elastic element 30 connected is.

The axial vibration damper 28 has one within the rubber elastic element 30 to the shaft journals 22 coaxially extending guide sleeve 34 on. In the guide sleeve 34 is a second absorber mass 36 against damping elements 38 in the axial direction 40 arranged displaceable and / or trained. The second absorber mass 36 is therefore between the damping elements 38 within the guide sleeve 34 arranged so that the axial ends of the second absorber mass 36 against the respective adjacent damping element 38 Act. Thus, also the axial vibration damper 28 designed as a spring-mass-damping system, wherein the damping elements 38 cause the spring and / or damping and the second absorber mass 36 represents the mass. Shocks or vibrations that are essentially in the axial direction 40 on the rotor 10 can act through the axial vibration damper 28 be compensated and / or reduced, wherein the shock and / or vibration energy from the Axialschwingungsdämpfer 28 is recorded.

The guide sleeve 34 is with the rubber-elastic element 30 is connected cohesively. In the present embodiment, the rubber-elastic element 30 to the guide sleeve 34 vulcanized. It should be noted that the rubber-elastic element 30 is formed such that, despite the connection of the rubber-elastic element 30 to the guide sleeve 34 , the first absorber mass 32 in the radial direction 33 can swing.

The radial vibration damper 26 has a longitudinal section through the rotor 10 a straight-line course. This is the radial vibration damper 26 coaxial in the laminated core 12 arranged and between the end flanges 20 clamped. In the radial direction, the radial vibration damper 26 over its entire length a distance to an inner circumferential surface 41 of the laminated core carrier 12 on, leaving the first absorber mass 32 in the radial direction 33 can swing. The outside diameter of the radial vibration absorber 26 in the area of the first absorber mass 32 is at least 5 mm smaller than the inner diameter of the laminated core 12 ,

The 2 shows that off 1 known rotor 10 , In contrast to 1 points the radial vibration damper 26 in a longitudinal section through the rotor 10 no rectilinear configuration, but a dumbbell-shaped configuration. Thus, the Radialschwingungstilger 26 between the axial direction of the rubber-elastic element 30 trained end sections 42 a middle section 44 with one opposite the respective end sections 42 reduced outside diameter. The end sections 42 of the rubber-elastic element 30 are supported at least in sections against the inner surface 41 of the laminated core carrier 12 down, causing the radial vibration damper 26 secure in the sheet metal carrier 12 is positionable. The middle section 44 is designed such that it can oscillate in the radial direction. Accordingly, the first absorber mass 32 arranged in the middle section. The outside diameter of the radial vibration absorber 26 in the middle section is at least 5 mm smaller than the inner diameter of the laminated core carrier 12 ,

LIST OF REFERENCE NUMBERS

10

rotor

12

Laminated core carrier

14

Laminated core

16

Outer peripheral surface laminated core carrier

18

Axial ends of laminated core

20

end flange

22

shaft journal

24

Rotor axis of rotation

26

Radialschwingungstilger

28

Axialschwingungstilger

30

Rubber-elastic element

32

First absorber mass

34

guide sleeve

36

Second absorber mass

38

damping element

40

Axial direction

41

Inner lateral surface of laminated core carrier

42

End section rubber-elastic element

44

Middle section

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2010/0225121 A1 [0005]

Claims (10)

Rotor (10) for mounting in an electric machine, with a hollow-cylindrical formed laminated core (12) on whose outer peripheral surface (16) a rotor core (14) can be arranged, and at the respective axial end (18) of the laminated core (12) each having a front flange (20) is arranged, wherein the respective end flange (20) has a shaft journal (22) for supporting the rotor (10), and in the hollow cylindrical shaped laminated core (12), a radial vibration damper (26) and an axial vibration damper (28) is arranged and / or formed. Rotor after Claim 1 , characterized in that the radial vibration damper (26) comprises a rubber-elastic element (30) with at least one in the rubber-elastic element (30) arranged and / or embedded first absorber mass (32). Rotor after Claim 2 , characterized in that the first absorber mass (32) is held within the elastomeric element (30) in the axial direction of the rotor (10) and in the radial direction of the rotor (10), the elastomeric element (30) due to a rotation of the Rotor (10) about the rotor axis of rotation (24) at least partially in the radial direction (33) can oscillate, and the first absorber mass (32) oscillates in the radial direction. Rotor after Claim 2 or 3 , characterized in that the first absorber mass (32) is arranged cohesively and / or positively in the rubber-elastic element (30). Rotor after one of Claims 1 to 4 , characterized in that the radial vibration damper (26) in a longitudinal section through the rotor (10) has a rectilinear configuration and is clamped between the end flanges (20). Rotor after one of Claims 1 to 4 , characterized in that the radial vibration damper (26) in a longitudinal section through the rotor (10) has a dumbbell-shaped configuration. Rotor according to one of the preceding claims, characterized in that the radial vibration damper (26) is arranged cohesively and / or positively in the laminated core (12) and / or with an inner circumferential surface (41) of the laminated core carrier (12) is connected. Rotor after one of Claims 2 to 7 , characterized in that the axial vibration damper (28) comprises a guide sleeve (34) extending coaxially within the elastomeric element (30) to the shaft journals (22), in which a second absorber mass (36) against damping elements (38) in the axial direction (40 ) is displaceable. Rotor after Claim 8 , characterized in that the guide sleeve (34) is connected to the rubber-elastic element (30) cohesively and / or non-positively. Electric machine with a rotor (10) according to one of the preceding claims.

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