DE102019211555A1 - Cooling fluid guide arrangement for cooling a rotor of an electrical machine - Google Patents

Abstract

A cooling fluid guide arrangement is proposed for cooling a rotor (1) of an electrical machine connected to a rotor shaft with a closed cooling fluid circuit, a cooling fluid guide sleeve (2) with at least one cooling fluid guide course (3, 4) being provided along the outer circumference, which is divided by an axially Rotor shaft is added to form the closed cooling fluid circuit. Furthermore, an electrical machine with a cooling fluid guide arrangement is proposed.

Description

The present invention relates to a cooling fluid guide arrangement for cooling a rotor of an electrical machine with a closed cooling fluid circuit. The invention also relates to an electrical machine with the cooling fluid guide arrangement.

For example from the publication DE 10 2017 112 835 A1 an electric motor is known in which cooling structures close to the surface run around a rotor shaft of the electric motor. An external cooling of the electric motor is provided by flat cooling water and oil lines, which run along the structures, the oil lines being embedded in sections between two adjacent sections of the wider cooling water lines. It has been shown that the known cooling arrangement is structurally complex and costly.

The present invention is based on the object of proposing a cooling fluid guide arrangement for cooling a rotor of an electrical machine and an electrical machine with the cooling fluid guide arrangement which, on the one hand, enable optimal cooling and, on the other hand, are structurally simple and inexpensive to implement.

This object is achieved by the features of patent claim 1 or 11, with advantageous and claimed developments resulting from the subclaims and the description as well as the drawings.

Thus, a cooling fluid guide arrangement is proposed for cooling a rotor of an electrical machine connected to a rotor shaft with a closed cooling fluid circuit. In order to provide an optimized and cost-effective and structurally simple cooling, a cooling fluid guide sleeve or the like is provided with at least one cooling fluid guide course along the outer circumference, the cooling fluid guide sleeve being received by an axially divided rotor shaft to form the closed cooling fluid circuit.

With the proposed cooling fluid guide arrangement, a particularly structurally simple and inexpensive cooling arrangement is realized which enables optimal dissipation of the waste heat produced by the rotor and the rotor shaft and from the end windings of a stator and other components arranged in the housing. By using a cooling fluid guide sleeve with at least one cooling fluid guide profile, only one additional component is advantageously used to implement the closed cooling fluid circuit, since the axially split design of the existing rotor shaft accommodates the cooling fluid guide sleeve.

The course of the cooling fluid guide can be implemented in various ways with the proposed cooling fluid guide arrangement. For example, a meandering course or the like can be provided. However, other courses, such as, for example, spiral-shaped or similar courses, would also be conceivable without further ado.

In order to implement a meandering course in the cooling fluid guide sleeve in a structurally simple manner, it is provided that several guide webs or the like, which are distributed over the circumference and project radially from the outer circumference of the cooling fluid guide sleeve, are arranged such that at least the meander-shaped cooling guide course from the cooling fluid inlet to the cooling fluid outlet is provided over the circumference of the cooling fluid guide sleeve is. By using guide webs or the like, a desired cooling fluid guidance course is made possible in a structurally simple manner by appropriate arrangement of the guide webs.

A particularly optimized cooling is achieved in that the cooling fluid flow path is divided into a first cooling fluid path and a second cooling fluid path. For this purpose, the guide webs on the common cooling fluid inlet are aligned in such a way that the cooling fluid flow is divided into the first cooling fluid course and the second cooling fluid course, the first cooling fluid course extending clockwise and the second cooling fluid course counterclockwise around the circumference to the opposite common cooling fluid drain.

The axially divided rotor shaft proposed in the proposed cooling fluid guide arrangement can be implemented in structurally different ways. A particularly simple construction can provide that the axially divided rotor shaft is provided by a first rotor shaft element and a second rotor shaft element. The rotor shaft elements, which quasi-form rotor shaft halves, are fastened to one another on the axial side, for example by pressing or other connection options.

In order to implement the closed cooling fluid circuit, it is provided that one end of the cooling fluid guide sleeve is received by the first rotor shaft element and the other, second end of the cooling fluid guide sleeve is received by the second rotor shaft element. Accordingly, a closed cooling fluid circuit with the can by a corresponding connection of the two rotor shaft elements can be realized by the cooling fluid guide sleeve surrounding the split rotor shaft.

In addition to the function of the rotor shaft for transmitting a torque generated in the rotor to a drive shaft, a second function is thus implemented by the rotor shaft elements to implement a closed cooling fluid circuit with the cooling fluid guide sleeve. In this way, components can be saved, whereby a structurally simple and cost-effective cooling fluid guide arrangement is realized.

For the torque-transmitting fastening, one of the rotor shaft elements can preferably have a special design inside. For example, an axially protruding fastening pin or the like can be provided for this, which receives the drive shaft and thus enables fastening to the rotor shaft. Other types of fastening are also conceivable, but it has been shown that this type of fastening is not only structurally simple, but also inexpensive.

In the proposed cooling fluid guide arrangement, a preferred embodiment of the cooling fluid supply can provide that the cooling fluid guide arrangement is supplied with cooling fluid from a housing-side cooling fluid supply arranged outside the housing. Since the cooling fluid guide sleeve rotatably mounted with the rotor shaft elements is rotatable in contrast to the cooling fluid supply on the housing side, the cooling fluid circuit can be connected in terms of flow via a rotary leadthrough.

Another aspect of the present invention provides that an electrical machine with the cooling fluid guide arrangement described above is claimed, so that the advantages described above and other advantages result.

• 1 eine teilgeschnittene Ansicht einer erfindungsgemäßen Kühlfluidführungsanordnung in einer elektrischen Maschine;
• 2 eine Einzelteilansicht einer Kühlfluidführungshülse der Kühlfluidführungsanordnung mit mäanderförmigen Kühlfluidführungsverläufen der Kühlfluidzuführung;
• 3 eine Einzelteilansicht der Kühlfluidführungshülse der Kühlfluidführungsanordnung mit mäanderförmigen Kühlfluidführungsverläufen der Kühlfluidabführung aus einer anderen Perspektive;
• 4 eine dreidimensionale Einzelteilansicht eines ersten Rotorwellenelements der axial geteilten Rotorwelle;
• 5 eine geschnittene Ansicht des ersten Rotorwellenelements;
• 6 eine dreidimensionale Ansicht eines zweiten Rotorwellenelements der axial geteilten Rotorwelle; und
• 7 eine geschnittene Ansicht des zweiten Rotorwellenelements.

The present invention is further explained below with reference to the drawings. Show it:

• 1 a partially sectioned view of a cooling fluid guide arrangement according to the invention in an electrical machine;
• 2 a detail view of a cooling fluid guide sleeve of the cooling fluid guide arrangement with meandering cooling fluid guide courses of the cooling fluid supply;
• 3 a detail view of the cooling fluid guide sleeve of the cooling fluid guide arrangement with meandering cooling fluid guide courses of the cooling fluid discharge from a different perspective;
• 4th a three-dimensional detail view of a first rotor shaft element of the axially divided rotor shaft;
• 5 a sectional view of the first rotor shaft member;
• 6 a three-dimensional view of a second rotor shaft element of the axially divided rotor shaft; and
• 7th a sectional view of the second rotor shaft member.

In the 1 to 7th an exemplary embodiment variant of a cooling fluid guide arrangement according to the invention is shown as an example in an electrical machine. The cooling fluid used can preferably be water or a water-glycol mixture or other fluids, such as oil.

The cooling fluid guide arrangement for cooling a rotor connected to an axially divided rotor shaft 1 and a stator 17th The electrical machine comprises a closed cooling fluid circuit which is supplied with cooling fluid from a cooling fluid supply. In order to achieve a particularly optimized cooling and also a structurally simple and inexpensive cooling fluid guide arrangement, it is provided that a cooling fluid guide sleeve 2 with at least one cooling fluid flow path 3 , 4th along the outer circumference of the cooling fluid guide sleeve 2 is provided, the cooling fluid guide sleeve 2 is received by the axially divided rotor shaft to form the closed cooling fluid circuit.

The cooling fluid guide sleeve 2 has as a cooling fluid guide course 3 , 4th exemplary meandering courses. These courses are defined by several radially distributed over the circumference from the outer circumference of the cooling fluid guide sleeve 2 protruding guide bars 5 realized, with the guide bars 5 are arranged such that the cooling fluid guide course 3 , 4th at the common cooling fluid inlet 6 in a first cooling fluid guidance course 3 and a second cooling fluid routing course 4th through the arrangement of the guide bars 5 is divided. The first cooling fluid routing course 3 extends clockwise around the circumference of the cooling fluid guide sleeve 2 to the opposite common cooling fluid drain 7th .

The second cooling fluid routing course 4th extends through the arrangement of the guide bars 5 counterclockwise around the circumference of the cooling fluid guide sleeve 2 to the opposite common cooling fluid drain 7th . This is indicated by arrows in the component views 2 and 3 indicated.

As in the 1 and 4th to 7th As can be seen, the axially divided rotor shaft is provided by a first rotor shaft element 8th as a first rotor shaft half and a second rotor shaft element 9 realized as a second rotor shaft half. The first rotor shaft element 8th and the second rotor shaft element 9 are connected to one another on the axial side, for example by pressing or the like. The first rotor shaft element takes up to form the closed cooling fluid circuit 8th a first end of the cooling fluid guide sleeve 2 and the second rotor shaft element 9 a second end of the cooling fluid guide sleeve 2 on.

As in particular from the individual views according to 4th to 7th can be seen are the first rotor shaft element 8th and the second rotor shaft element 9 each designed as a sleeve. The first rotor shaft element 8th and the second rotor shaft element 9 each has a smaller inner diameter 10 , 10A for receiving a drive shaft 11 and a larger inner diameter 12 , 12A for receiving the respectively assigned ends of the cooling fluid guide sleeve 2 on.

As shown in particular from the detail view 7th can be seen is the smaller inside diameter 10A of the second rotor shaft member 9 by an annular axially protruding fastening pin 13 for torque-transmitting attachment to the drive shaft 11 intended. In this way, not only is the associated end of the cooling fluid guide sleeve 2 but also the drive shaft 11 on the second rotor shaft element 9 and thus on the entire rotor 1 securely attached.

As shown in the cut view 1 As can be seen, the second rotor shaft element 9 one with the cooling fluid inlet 6 the cooling fluid guide sleeve 2 fluidly connected cooling fluid inlet channel 14th on. Furthermore, there is a cooling fluid drain arranged opposite one another 7th the cooling fluid guide sleeve 2 fluidly connected cooling fluid drainage channel 15th intended. The cooling fluid inlet channel 14th and the cooling fluid drainage channel 15th are like the cooling fluid inlet 6 and the cooling fluid drain 7th on the circumference of the second rotor shaft element 9 arranged opposite one another.

Furthermore, from the sectional illustration according to FIG 1 that in the proposed cooling fluid guide arrangement, both the axially split rotor shaft and the rotor 1 or the rotor shaft elements 8th , 9 as well as the cooling fluid guide sleeve 2 as well as the drive shaft 11 are arranged coaxially to one another.

In the embodiment variant shown by way of example, the closed cooling fluid circuit is supplied in terms of flow via a stationary cooling fluid supply located outside the housing. For this purpose, it is provided that the cooling fluid inlet channel 14th and the cooling fluid drainage channel 15th of the second rotor shaft member 9 via a common rotating union 16 are fluidly connected to the cooling fluid supply circuit.

List of reference symbols

1

rotor

2

Cooling fluid guide sleeve

3

first cooling fluid guidance course

4th

second cooling fluid guidance course

5

Guide bar

6th

Cooling fluid inlet

7th

Cooling fluid drain

8th

first rotor shaft element

9

second rotor shaft element

10, 10A

smaller inside diameter

11

drive shaft

12, 12A

larger inside diameter

13

Mounting pin

14th

Cooling fluid inlet channel

15th

Cooling fluid drainage channel

16

Rotating union

17th

stator

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 102017112835 A1 [0002]

Claims (11)

Cooling fluid guide arrangement for cooling a rotor (1), connected to a rotor shaft, of an electrical machine with a closed cooling fluid circuit, characterized in that a cooling fluid guide sleeve (2) with at least one cooling fluid guide path (3, 4) is provided along the outer circumference, which is supported by an axially divided rotor shaft is added to form the closed cooling fluid circuit. Cooling fluid guide arrangement according to Claim 1 , characterized in that the cooling fluid guide sleeve (2) has a meandering course as the cooling fluid guide course (3, 4). Cooling fluid guide arrangement according to Claim 1 or 2 , characterized in that a plurality of guide webs (5) distributed over the circumference and projecting radially from the outer circumference of the cooling fluid guide sleeve (2) are arranged in such a way that at least one meandering cooling fluid guide course (3, 4) from the cooling fluid inlet (6) to the cooling fluid outlet (7) via the The circumference of the cooling fluid guide sleeve (2) is provided. Cooling fluid guide arrangement according to Claim 3 , characterized in that the cooling fluid guidance course (3, 4) at the common cooling fluid inlet (6) can be divided into a first cooling fluid guidance course (3) and a second cooling fluid guidance course (4) by the arrangement of the guide webs (5), the first cooling fluid guidance course (3 ) clockwise and the second cooling fluid guide course (4) extends counterclockwise around the circumference to the opposite common cooling fluid drain (7). Cooling fluid guide arrangement according to one of the preceding claims, characterized in that the axially divided rotor shaft is provided by a first rotor shaft element (8) and by a second rotor shaft element (9). Cooling fluid guide arrangement according to Claim 5 , characterized in that the first rotor shaft element (8) receives one end of the cooling fluid guide sleeve (2) and the second rotor shaft element (9) receives a second end of the cooling fluid guide sleeve (2). Cooling fluid guide arrangement according to Claim 5 or 6 , characterized in that the first rotor shaft element (8) and the second rotor shaft element (9) are each designed in the form of a sleeve, a smaller inner diameter (10, 10A) for receiving a drive shaft (11) and a larger inner diameter (12, 12A) for receiving of the respectively assigned end of the cooling fluid guide sleeve (2) is provided. Cooling fluid guide arrangement according to Claim 7 , characterized in that the smaller inner diameter (10A) of the second rotor shaft element (9) is provided by an annular, axially projecting fastening pin (13) for torque-transmitting fastening to the drive shaft (11). Cooling fluid guide arrangement according to one of the Claims 5 to 8th , characterized in that the second rotor shaft element (9) has a cooling fluid inlet channel (14) connected in terms of flow to the cooling fluid inlet (6) of the cooling fluid guide sleeve (2) and a cooling fluid outlet channel (15) connected in terms of flow to the cooling fluid outlet (7) of the cooling fluid guide sleeve (2), wherein the cooling fluid inlet channel (14) and the cooling fluid outlet channel (15) are arranged opposite one another on the circumference of the second rotor shaft element (9). Cooling fluid guide arrangement according to Claim 9 , characterized in that the cooling fluid inlet channel (14) and the cooling fluid outlet channel (15) of the second rotor shaft element (9) are fluidly connected to a housing-side cooling fluid supply circuit via a rotary feedthrough (16). Electrical machine with a cooling fluid guide arrangement according to one of the preceding claims.

Images