DE102022121843A1 - Stator for an electrical machine - Google Patents

Abstract

The invention relates to a stator (1) for an electrical machine, with a multi-part laminated core (2), which has a first laminated core part (3) and at least one formed separately from the first laminated core part (3) and is located in the axial direction (4) of the stator (1) has a second laminated core part (5) at least indirectly adjoining the first laminated core part (3), and with a coolant path (6) through which a coolant can flow, which extends at least partially within the laminated core (2), the coolant path (6 ) has at least one cooling channel (7), which extends within the second laminated core part (5) and in the circumferential direction (8) of the stator (1) between two adjacent in the circumferential direction (8) of the stator (1) and each for arranging at least one Winding of the stator (1) provided recesses (9) of the second laminated core part (5) is arranged, and the coolant path (6) has a length region (10) over which at least part of the coolant flowing through the length region (10) into the cooling channel ( 7) can be initiated.

Description

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

The EP 1 614 205 B1 discloses an electrical machine with a housing, a stator laminated core and a rotor laminated core, which are arranged in the housing, of which the stator laminated core and the rotor laminated core each have axially extending cooling channels. The electrical machine has winding head spaces on the end faces of the two laminated cores, with cooling channel extensions being arranged on the cooling channels of the stator laminated core in the winding head spaces, with which a cooling medium can be derived from the housing. The cooling channel extensions on the stator core are tubes that are led to the outside through a bearing shield of the electrical machine.

Furthermore, a stator for an electrical machine can be found in WO 2018/087 017 A1 as known. The stator has at least one laminated core, in which a plurality of cooling channels through which a cooling fluid can flow for cooling the stator and extending in the axial direction of the stator are formed, the respective cooling channel being completely circumferentially delimited in its circumferential direction by the laminated core.

It is the object of the invention to create a stator for an electrical machine, so that the stator can be cooled particularly advantageously.

This object is achieved according to the invention by a stator for an electrical machine with the features of patent claim 1. Advantageous embodiments of the invention are the subject of the dependent claims and the description.

The invention relates to a stator for an electrical machine, in particular for a motor vehicle. Preferably, the motor vehicle can be driven by the electric machine. The motor vehicle is preferably designed as a motor vehicle, in particular as a passenger car, commercial vehicle or truck. Alternatively, the motor vehicle is designed, for example, as a passenger bus or as a motorcycle, in particular as a motorcycle. Preferably, the motor vehicle, particularly in its fully manufactured state, has the electric machine. Preferably, the electrical machine, especially in its fully manufactured state, has the stator.

The stator is connected, for example, to a housing of the electrical machine. The electrical machine preferably has a rotor which is rotatable about a machine axis of rotation of the electrical machine relative to the stator. By means of the electric machine, electrical power can be converted into mechanical power, whereby the rotor can be driven by the stator and can thereby be rotated about the machine axis of rotation relative to the stator. The electrical power can be provided, for example, by an on-board electrical system of the motor vehicle, in particular referred to as an on-board energy network. The electric machine can provide at least one torque via the rotor, in particular for driving the motor vehicle.

The stator has a multi-part laminated core. This means that the laminated core is designed in several parts, for example at least in two parts. The laminated core has a first laminated core part and at least one second laminated core part which is formed separately from the first laminated core part and adjoins the first laminated core part at least indirectly, in particular directly, in the axial direction of the stator. In other words, the laminated core parts are arranged at least indirectly, in particular directly, on one another in the axial direction of the stator. This means that the laminated core parts are adjacent to the stator, for example in the axial direction. The laminated core parts are preferably connected to one another, in particular directly. The laminated core thus comprises, for example, several laminated core parts, in particular each connected to one another.

The stator has a coolant path through which a coolant can flow, which extends at least in regions, in particular completely, within the laminated core, in particular within the first laminated core part and/or the second laminated core part. In other words, the coolant path runs at least partially within the laminated core, in particular within the first laminated core part and/or the second laminated core part. This means that the coolant can flow through the laminated core, in particular the first laminated core part and/or the second laminated core part. Again in other words, the coolant path is at least partially or at least partially limited by the laminated core, in particular by the first and/or the second laminated core part.

The coolant can be understood to mean, in particular, a cooling medium or a cooling fluid. The coolant is preferably an oil, which can be referred to in particular as cooling oil.

In order to be able to cool the stator particularly advantageously, it is provided according to the invention that the coolant path has at least one cooling channel through which the coolant can flow in the axial direction of the stator, which channel extends, in particular at least in regions, within the second laminated core part. In other words, the cooling channel has at least one cooling channel area through which the coolant can flow, which extends, in particular completely, within the second laminated core part. This means that at least the cooling channel area is arranged within the second laminated core part. Again in other words, the cooling channel, in particular the cooling channel area, is at least partially, in particular completely, limited, in particular in the radial direction of the cooling channel or the stator. Preferably, the cooling channel, in particular the cooling channel area, in particular in the circumferential direction of the cooling channel or the stator, is completely circumferentially delimited by the second laminated core part.

The cooling channel is arranged in the circumferential direction of the stator between two recesses in the second laminated core part that are adjacent in the circumferential direction of the stator, in particular directly, and are each provided for arranging at least one winding of the stator. In other words, the cooling channel extends between the recesses of the second laminated core part that are adjacent in the circumferential direction of the stator, in particular directly. The respective recess is designed to arrange or accommodate the at least one winding. This means that the respective recess at least partially, in particular completely, delimits a receiving space in which the respective winding can be arranged or is arranged. Thus, the cooling channel is arranged, for example, in the circumferential direction of the stator between the two recesses which are adjacent in the circumferential direction of the stator, in particular directly, in which at least one of the windings is arranged. In other words, the cooling channel is arranged, for example, in the circumferential direction of the stator between two windings of the stator that are adjacent in the circumferential direction of the stator, in particular directly.

The coolant path has a length range through which the coolant can flow and at least partially delimited by the first laminated core part, in particular directly, over which at least part of the coolant flowing through the length range can be introduced into the cooling channel, in particular directly. In other words, the length range is at least partially formed by the first laminated core part or at least partially surrounded by the first laminated core part, the cooling channel being able to be supplied with the coolant over the length range. This means that the length region and the cooling channel are fluidly connected to one another, in particular directly, with the length region being arranged upstream of the cooling channel in the flow direction of the fluid flowing through the coolant path. In other words, the coolant can be fed into the cooling channel over the length range.

The winding is preferably held, in particular directly, on the laminated core. The winding comprises, for example, at least one turn, preferably several turns, and can in particular be referred to as a stator winding or a winding. The winding is made of copper, for example. The winding is formed, for example, from a continuous conductor. For example, the winding or several windings formed from the continuous conductor form or form a coil. For example, the stator includes several coils. The winding or the coil forms, for example, a winding body which is held on the laminated core. For example, the winding body comprises several windings or several coils. Thus, for example, at least one of the winding bodies is arranged in the respective recess.

The invention is based in particular on the following findings and considerations: In order to be able to cool the electrical machine, in particular the stator, particularly well, the best possible or particularly good heat dissipation from the laminated core must be achieved, for example. In principle, it is conceivable to use a cooling system based on a water-glycol mixture or oil as a cooling medium to cool the electrical machine, in particular the stator. Using the water-glycol mixture or cooling based on a water-glycol system can, for example, only enable cooling of the laminated core, particularly referred to as a stator laminated core, on an outer surface, in particular an outer lateral surface, of the laminated core. Furthermore, a particularly complex separation between oil and the water-glycol mixture in the electric motor may be required. In order to be able to dissipate waste heat generated in the electrical machine, in particular in the stator, particularly well or better, oil channels integrated into the laminated core, especially directly, are usually more efficient or better than the water-glycol system. The windings, for example, are a particularly large source of waste heat from the stator. In a conventional stator, for example, the cooling channel is particularly far away the windings are spaced apart, which means that cooling of the windings using the coolant may not be optimal. As a result, particularly high temperatures can occur on the stator, particularly partially, during operation of the electrical machine, particularly if the electrical machine is a high-performance electrical machine. These cannot be sufficiently dissipated in the conventional stator, as a result of which the electric machine, particularly referred to as a drive machine, has to be degraded, for example, and thus power has to be reduced.

In contrast, in the stator according to the invention, the stator, in particular the respective winding, can be cooled particularly advantageously, in particular particularly intensively. For example, the fact that the cooling channel is arranged in the circumferential direction of the stator between the recesses or the windings can bring about particularly good cooling of the windings. This can be achieved, for example, in that the cooling channel can be brought particularly close to the windings and/or in that a particularly large area of the respective winding can be surrounded by the cooling channel. This makes particularly good cooling of the stator, in particular the stator laminated core or the winding, possible, particularly in particularly wide operating ranges of the electrical machine. Furthermore, the coolant can be fed into the cooling channel particularly advantageously over the length range. For example, by feeding the coolant into the cooling channel via a specific laminated core part in the form of the second laminated core part, the cooling channel can be supplied with the coolant with particularly little effort. As a result, and in particular because the laminated core is made up of several parts, the stator can be manufactured with particularly little effort. As a result, for example, manufacturing costs of the stator can be kept particularly low.

In a further embodiment, it is provided that the cooling channel has a slot-shaped cross section, the main direction of extension of which runs at least essentially, in particular completely, in the radial direction of the stator. In other words, the cross section is designed as a longitudinal slot. As a result, an interaction between the coolant flowing through the cooling channel and a respective magnetic field, in particular an electrical one, caused by the respective winding can be kept particularly low. In other words, the course of magnetic field lines through the slot-shaped cross section can be kept particularly small. As a result, for example, a negative influence on the efficiency of the electrical machine can be kept particularly low. This means that the efficiency of the electrical machine can be particularly increased. The main extension direction can be understood in particular as a direction in which the cross section extends further than in further extension directions of the cross section that differ from the main extension direction. The cross section preferably extends perpendicular to the axial direction of the cooling channel, in particular to the axial direction of the rotor.

In a further embodiment, it is provided that the length region in the circumferential direction of the stator can be flowed through by the coolant, in particular over its entire circumference. In other words, the coolant flowing through the length region is guided in the circumferential direction of the stator and fed to the cooling channel in the first laminated core part. As a result, the cooling channel can be supplied with the coolant particularly advantageously, in particular with particularly little effort. As a result, the stator can be cooled particularly advantageously, in particular particularly intensively. Furthermore, the stator can be manufactured with particularly little effort.

In a further embodiment, it is provided that the coolant path has at least one channel through which the coolant can flow and which is spaced apart from the cooling channel and which extends, in particular at least in regions, within the second laminated core part. In other words, the channel is at least partially, in particular completely, formed or surrounded by the second laminated core part. This means that the channel is at least partially, in particular completely, for example in the radial direction of the stator, delimited by the second laminated core part. In other words, the channel has at least one channel region through which the coolant can flow, which extends, in particular completely, within the second laminated core part. Since the coolant can flow through the channel, the channel can be understood as a further cooling channel that is different from the cooling channel. The stator, in particular the second laminated core part, can therefore be cooled by means of the coolant flowing through the channel. The channel adjoins one of the recesses towards the outside in the radial direction of the stator, at least indirectly, in particular directly. In other words, the channel at least partially surrounds one of the recesses, in particular in the radial direction of the stator and/or in the circumferential direction of the stator. Again in other words, the channel is arranged in the radial direction of the stator above the respective recess, which is particularly referred to as a winding bushing. Through this the winding can be cooled particularly intensively. This means that the temperature of the stator can be kept particularly low. Preferably, the channel is arranged in the radial direction of the stator between the recess and an outer lateral surface of the laminated core, in particular of the second laminated core part.

It is preferably provided that the laminated core has at least one further laminated core part which is formed separately from the first and the second laminated core part and which adjoins the second laminated core part at least indirectly, in particular directly, in the axial direction of the stator. In other words, the laminated core parts are arranged at least indirectly, in particular directly, against one another in the axial direction of the stator. Preferably, the further laminated core part is connected, in particular directly, to the second laminated core part. For example, the further laminated core part adjoins the second laminated core part towards the outside in the axial direction of the stator, in particular directly. Preferably, the cooling channel and the channel each extend in regions within the further laminated core part. In other words, the cooling channel runs in regions within the further laminated core part and the channel runs in regions within the laminated core part. This means that the cooling channel has, for example, a second cooling channel region which adjoins the cooling channel region, in particular directly, in the axial direction of the stator and which extends within the further laminated core part. For example, the channel has the first channel region, which extends within the second laminated core part, and the channel has, for example, a second channel region which adjoins the channel region of the channel in the axial direction of the stator, in particular directly, and which is located within the further laminated core part extends. In other words, the channel and the cooling channel are partially formed by the further sheet metal part or surrounded by the further sheet metal package part. This means that the cooling channel and the channel are each limited in areas by the further laminated core part. This allows the stator, in particular the respective winding, to be cooled particularly intensively. For example, the cooling channel, in particular in the second cooling channel area, is completely circumferentially delimited by the further laminated core part in the circumferential direction of the cooling channel. For example, the channel, in particular in the second channel region, is completely circumferentially delimited in the circumferential direction of the channel by the further laminated core part. For example, at least in some areas, in particular in the channel area, the channel is completely circumferentially delimited in the circumferential direction of the channel by the second laminated core part.

In a further embodiment, it is provided that the channel within the second laminated core part has a first cross section through which the coolant can flow and within the further laminated core part has a second cross section through which the coolant can flow and which is different from the first cross section. This means that the channel region of the channel has the first cross section and the second channel region of the channel has the second cross section. In other words, a cross section through which the coolant flows as it flows through the channel is variable or changed when the coolant flows from the second laminated core part to the further laminated core part, in particular at the transition between the second laminated core part and the further laminated core part. As a result, turbulence in the coolant flowing through the channel can be particularly increased. This can be achieved, for example, by flow edges at which the first cross section and the second cross section merge into one another. The flow edge can be understood in particular as a separation edge. Due to the particularly high turbulence, heat transfer between the coolant flowing through the channel and the laminated core part, in particular the second laminated core part and/or the further laminated core part, can be particularly improved. In other words, the heat transfer from the coolant into the laminated core or from the laminated core into the coolant can be particularly improved. As a result, the stator, in particular the laminated core or the respective winding, can be cooled particularly intensively.

In a further embodiment, it is provided that the coolant path has at least one second channel through which the coolant can flow and spaced from the channel in the circumferential direction of the stator, which extends within the second and the further laminated core part. This means that the second channel has a first channel region which extends within the second laminated core part, and that the second channel has a second channel region which adjoins the first channel region of the second channel in the axial direction of the stator, in particular directly extends within the further laminated core part. In other words, the second channel is at least partially, in particular completely, limited in its first channel area by the second laminated core part and the second channel is at least partially, in particular completely, limited in its second channel area by the further laminated core part. Thus, the second channel is at least partially formed by the second laminated core part and the further laminated core part or by the second laminated core part and the further laminated core part surround. Preferably, the second channel adjoins one of the recesses towards the outside in the radial direction of the stator, at least indirectly, in particular directly. In other words, the second channel is arranged in the radial direction of the stator between one of the recesses and an outer lateral surface of the laminated core, in particular of the second laminated core part and/or the further laminated core part. As a result, the stator, in particular the laminated core or the respective winding, can be cooled particularly intensively. For example, the channel, in particular referred to as the first channel, adjoins a first of the recesses in the radial direction of the stator towards the outside, at least indirectly, in particular directly, and the second channel adjoins in the radial direction of the stator towards the outside, at least indirectly, in particular directly, to a second of the recesses that is different from the first recess. The first and second recesses are, for example, directly adjacent to the recesses in the circumferential direction of the stator.

In a further embodiment, it is provided that the second channel has the second cross section within the second laminated core part, in particular in the channel region of the second channel, and the first cross section within the further laminated core part, in particular in the second channel region of the second channel. This can be understood in particular to mean that the second channel in the second laminated core part, in particular in the channel region of the second channel, has a cross section through which the coolant can flow, which corresponds to the second cross section of the channel, in particular in shape and/or size, that is is preferably structurally identical to the second cross section of the channel, and that the second channel in the further laminated core part, in particular in the second channel region of the second channel, has a cross section through which the coolant can flow, which corresponds to the first cross section of the channel, in particular in shape and/or Size corresponds, that is to say is preferably structurally identical to the first cross section of the channel. In other words, the first cross section of the channel extends, in particular at least partially or completely, within the first laminated core part, the second cross section of the channel extends, in particular at least partially or completely, within the further laminated core part. It is preferably provided that the second cross section of the second channel extends, in particular at least partially or completely, within the second laminated core part, and the first cross section of the second channel extends, in particular at least partially or completely, within the further laminated core part.

It is preferably provided that the second laminated core part and the further laminated core part are constructed identically, at least with respect to a respective arrangement of the respective cross sections in or on the respective laminated core part, in particular at least predominantly or completely. In other words, the second laminated core part and the further laminated core part are designed to be identical or identical, at least with regard to the respective cross sections.

It is preferably provided that the channel and the second channel have an angular distance from one another extending in the circumferential direction of the stator, by which the second laminated core part and the further laminated core part, in particular with respect to a, in particular imaginary, reference angular position, in the circumferential direction of the stator, in particular around Machine axis of rotation of the electrical machine, offset relative to one another, in particular twisted or rotated, are arranged. In other words, the channel and the second channel are arranged at the angular distance from one another, with the second laminated core part and the further laminated core part for producing the rotor, in particular with respect to the reference angular position, being arranged offset or rotated relative to one another by the angular distance and connected to one another . Because the second laminated core part and the further laminated core part are arranged offset or rotated by the angular distance, in particular with respect to the reference angular position, the first cross section of the second laminated core part and the second cross section of the further laminated core part are fluidly connected to one another, in particular directly, and the second Cross section of the second laminated core part and the first cross section of the further laminated core part are fluidly connected to one another, in particular directly. In other words, the channel area of the first channel and the second channel area of the first channel are, in particular directly, fluidly connected to one another and the channel area of the second channel and the second channel area of the second channel are, in particular directly, fluidly connected to one another. This means that, for example, the respective cross-sectional change can be brought about or is brought about by arranging the second laminated core part and the further laminated core part offset or rotated by the angular distance from one another. As a result, the particularly improved heat transfer can be made possible with particularly little effort. Thus, the second laminated core part and the further laminated core part can, for example, be designed to be identical in construction, whereby the stator can be manufactured with particularly little effort. This means that a channel design of the first Channel and the second channel in the laminated core, in particular in the second laminated core part and / or in the further laminated core part, is designed such that the flow edges result in the respective channel due to the rotation by the angular distance. The angular distance is, for example, 10 degrees. The machine axis of rotation preferably corresponds to an axis of the stator, which is particularly referred to as the stator axis.

For example, in the reference angular position, the first cross section extending in the first laminated core part and the first cross section extending in the further laminated core part adjoin one another in the axial direction of the stator, in particular at least indirectly or directly. In other words, for example, the cross section arranged in the further laminated core part and the cross section arranged in the first laminated core part overlap each other, in particular in the axial direction of the stator. This means that in the reference angular position, the channel region of the channel and the second channel region of the second channel adjoin one another or would adjoin one another in the axial direction of the stator. For example, in the reference angular position, the second cross section extending in the first laminated core part and the second cross section extending in the further laminated core part adjoin one another in the axial direction of the stator, in particular at least indirectly or directly. In other words, for example, the second cross section arranged in the first laminated core part and the second cross section arranged in the further laminated core part overlap each other, in particular in the axial direction of the stator. This means that in the reference angular position, the second channel region of the first channel and the channel region of the second channel adjoin one another or would adjoin one another in the axial direction of the stator.

In a further embodiment, it is provided that the laminated core is formed separately from the laminated core parts, in particular separately from the first and/or the second and/or the further laminated core part, and extends outwards in the axial direction of the stator at least indirectly, in particular directly , to the second laminated core part, in particular to the further laminated core part, has a cover laminated core part. In other words, the cover laminated core part and the other laminated core parts, in particular the first laminated core part and/or the second laminated core part and/or the further laminated core part, are arranged next to one another in the axial direction of the stator, in particular directly. It is preferably provided that the cover sheet metal package part is designed as the outermost one of the sheet metal package parts. In other words, an outer side of the laminated core that faces outwards in the axial direction of the stator is formed by the cover laminated core part. It is preferably provided that the cover plate package part has at least one outlet opening through which the coolant can flow, in particular in the axial direction of the stator, via which a winding head of the stator is connected to the coolant path, in particular the cooling channel and/or the first channel and/or the second Channel through which coolant flows can be wetted. In other words, the winding head can be supplied with the coolant via the outlet opening. This allows the winding head to be cooled particularly advantageously. In particular, this allows the temperature of the winding head to be kept particularly low. The outlet opening is preferably fluidly connected to the cooling channel and/or the first channel and/or the second channel.

In a further embodiment, it is provided that the coolant path has at least one second length region through which the coolant can flow and fluidly connected to the first length region, which extends inwards in the radial direction of the stator from an outer lateral surface of the stator relative to the radial direction of the stator second laminated core part, in particular at least partially or completely, for example directly, is limited. In other words, the laminated core, in particular the second laminated core part and/or the further laminated core part, can be flowed around by the coolant, in particular directly, on its outer lateral surface, that is to say on an outer side facing outwards in the radial direction of the stator. This means that the laminated core, in particular the second laminated core part and/or the further laminated core part, has external cooling. This allows the laminated core to be cooled particularly intensively.

Further features of the invention emerge from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and/or shown in the figures alone can be used not only in the combination specified in each case, but also in other combinations or on their own.

• 1 eine schematische Perspektivansicht eines erfindungsgemäßen Stators; und
• 2 eine schematische Teilschnittansicht eines erfindungsgemäßen Stators; und
• 3 eine schematische und perspektivische Teilansicht eines erfindungsgemäßen Stators zur Veranschaulichung eines Kühlkanals und eines Kanals des Stators; und
• 4 eine schematische Teilschnittansicht eines ersten Blechpaketteils eines erfindungsgemäßen Stators; und
• 5 eine schematische Perspektivansicht eines erfindungsgemäßen Stators gemäß einer weiteren Ausführungsform; und
• 6 eine schematische Explosionsdarstellung des Stators aus 5; und
• 7 eine schematische und perspektivische Teilansicht eines erfindungsgemäßen Stators zur Veranschaulichung eines Kühlmittelflusses gemäß einer weiteren Ausführungsform; und
• 8 eine schematische Teilschnittansicht eines zweiten Blechpaketteils eines erfindungsgemäßen Stators gemäß der in 7 gezeigten Ausführungsform; und
• 9 eine schematische Teilschnittansicht eines zweiten Blechpaketteils eines erfindungsgemäßen Stators gemäß einer weiteren Ausführungsform; und
• 10 eine schematische und perspektivische Teilansicht eines erfindungsgemäßen Stators zur Veranschaulichung eines Kühlmittelflusses der in 9 gezeigten Ausführungsform; und
• 11 eine schematische Teilschnittansicht eines zweiten Blechpaketteils eines erfindungsgemäßen Stators gemäß einer weiteren Ausführungsform; und
• 12 eine schematische und perspektivische Teilschnittansicht eines erfindungsgemäßen Stators zur Veranschaulichung eines Kühlmittelflusses der in 11 gezeigten Ausführungsform; und
• 13 eine schematische Teilschnittansicht eines zweiten Blechpaketteils eines erfindungsgemäßen Stators gemäß einer weiteren Ausführungsform; und
• 14 eine schematische und perspektivische Teilansicht eines erfindungsgemäßen Stators zur Veranschaulichung eines Kühlmittelflusses der in 13 gezeigten Ausführungsform.

The invention will now be explained in more detail using a preferred exemplary embodiment and with reference to the drawings. Show it:

• 1 a schematic perspective view of a stator according to the invention; and
• 2 a schematic partial sectional view of a stator according to the invention; and
• 3 a schematic and perspective partial view of a stator according to the invention to illustrate a cooling channel and a channel of the stator; and
• 4 a schematic partial sectional view of a first laminated core part of a stator according to the invention; and
• 5 a schematic perspective view of a stator according to the invention according to a further embodiment; and
• 6 a schematic exploded view of the stator 5 ; and
• 7 a schematic and perspective partial view of a stator according to the invention to illustrate a coolant flow according to a further embodiment; and
• 8th a schematic partial sectional view of a second laminated core part of a stator according to the invention according to in 7 embodiment shown; and
• 9 a schematic partial sectional view of a second laminated core part of a stator according to the invention according to a further embodiment; and
• 10 a schematic and perspective partial view of a stator according to the invention to illustrate a coolant flow in 9 embodiment shown; and
• 11 a schematic partial sectional view of a second laminated core part of a stator according to the invention according to a further embodiment; and
• 12 a schematic and perspective partial sectional view of a stator according to the invention to illustrate a coolant flow in 11 embodiment shown; and
• 13 a schematic partial sectional view of a second laminated core part of a stator according to the invention according to a further embodiment; and
• 14 a schematic and perspective partial view of a stator according to the invention to illustrate a coolant flow in 13 embodiment shown.

In the figures, identical or functionally identical elements are provided with the same reference numerals.

1 shows a schematic perspective view of a stator 1 for an electrical machine. The stator 1 has a multi-part laminated core 2, which has a first laminated core part 3 and at least one second laminated core part 5, which is formed separately from the first laminated core part 3 and adjoins the first laminated core part 3 at least indirectly, in particular directly, in the axial direction 4 of the stator 1 having. 2 shows the second laminated core part 5 in a schematic partial sectional view. 3 shows the stator 1, in particular the second laminated core part 5, in a schematic and perspective partial view. 4 shows the first laminated core part 3 in a schematic partial sectional view. The stator 1 has a coolant path 6 through which a coolant can flow, which extends at least partially within the laminated core 2.

In order to be able to cool the stator 1, in particular the laminated core 2, for example the second laminated core part 5, particularly advantageously, in particular particularly intensively, it is provided that the coolant path 6 has at least one cooling channel 7 through which the coolant can flow in the axial direction 4 of the stator 1 which extends within the second laminated core part 5 and in the circumferential direction 8 of the stator 1 between two recesses 9 of the laminated core 2, in particular of the second laminated core part 5, which are adjacent in the circumferential direction 8 of the stator 1 and are each provided for arranging at least one winding of the stator 1. is arranged. The respective recess 9 is preferably designed as a respective stator groove of the stator 1 or the laminated core 2. In the exemplary embodiment, it is provided that the laminated core 2, in particular the second laminated core part 5, has a plurality of recesses 9, which are each provided or designed for arranging the respective windings of the stator 1. Furthermore, it is provided in the exemplary embodiment that the coolant path 6 has a plurality, in particular a plurality, of cooling channels 7 through which the coolant can flow in the axial direction 4 of the stator 1, which each extend within the second laminated core part 5 and in the circumferential direction 8 of the stator 1 respectively between two recesses 9 of the second laminated core part 5 or of the laminated core 2 which are adjacent in the circumferential direction 8 of the stator 1 and are each provided for arranging at least one respective winding of the stator 1. In other words, the stator 1 has, for example, a respective tooth which can be arranged or is arranged in the respective recess 9, with an area extending in the circumferential direction 8 of the stator 1 between the respective recesses 9 or the respective teeth being referred to in particular as a tooth area can, with the cooling channel 7 preferably extending in the tooth area. The Cooling channel 7 is therefore guided, for example, through the tooth area. The respective cooling channel 7 and the respective channel 15 are therefore intended for internal cooling of the laminated core 2. For example, the cooling channels 7 and/or the recesses 9 are arranged evenly distributed in the circumferential direction 8 of the stator 1.

The coolant path 6 has a length region 10 through which the coolant can flow and at least partially limited by the first laminated core part 3, in particular directly, via which at least part of the coolant flowing through the length region 10 can be introduced, in particular directly, into the respective cooling channel 7. The length range 10 is, for example, at least partially limited by a housing element of the stator 1 or the electrical machine, which is formed separately from the laminated core 2, in particular directly, preferably in the radial direction 11 of the stator 1 towards the outside.

In the in 1 In the exemplary embodiment shown, the second laminated core part 5 adjoins the first laminated core part 3 at one end at least indirectly, in particular directly, in the axial direction 4 of the stator 1. For example, the laminated core 2 has a third laminated core part 12, which is formed separately from the laminated core parts 3, 5 and which adjoins the first laminated core part 3 at the other end at least indirectly, in particular directly, in the axial direction 4 of the stator 1. The laminated core parts 3, 5, 12 are preferably connected to one another. Thus, the first laminated core part 3, in particular in relation to the laminated core parts 5, 12, is arranged centrally in the axial direction 4 of the stator 1, in particular in the laminated core 2.

The laminated core parts 5, 12 are preferably designed to be identical in construction. This means that cooling channels 7 of the coolant path 6 through which the coolant can flow in the axial direction 4 of the stator 1 also extend within the third laminated core part 12, the cooling channels 7 of which extend in the circumferential direction 8 of the stator 1 between two adjacent in the circumferential direction of the stator 1 and each for arranging the respective winding of the stator 1, respective recesses of the laminated core 2, in particular the third laminated core part 12, are arranged. The first laminated core part 3 can therefore be understood to mean, for example, a central part of the laminated core 2. The respective laminated core part 5, 12 can in particular be understood to mean a respective individual sheet of the laminated core 2. Preferably, the coolant flowing through the length region 10 can be introduced into the respective cooling channel 7 extending within the third laminated core part 12.

In a further embodiment, it is provided that the respective cooling channel 7 each has a respective slot-shaped cross section 13, the main extension direction 14 of which runs at least essentially in the radial direction 11 of the stator 1. In other words, a channel guide of the cooling channel 7 comprises a longitudinal slot, in particular for each tooth area. As a result, a negative influence on a magnetic field of the stator 1 or the electrical machine can be avoided particularly reliably. For example, a shape of the cross section 13 corresponds at least essentially or at least predominantly to a shape of a triangle, in particular a tapered one. For example, a lower or inner corner of the triangle in the radial direction 11 of the stator 1 has a radius which is preferably particularly small. Preferably, an upper or outer side of the triangle in the radial direction 11 is provided with a radius which is preferably larger than the radius at the lower corner. Side edges of the cooling channel 7 preferably run parallel to, in particular adjacent side edges of the respective recess 9. The course of magnetic field lines can be influenced particularly little by the respective radius or respective curves.

It is preferably provided that the length region 10 in the circumferential direction 8 of the stator 1, in particular over its entire circumference, can be flowed through or is flowed through by the coolant.

In a further embodiment, it is provided that the coolant path 6 has at least one channel 15 through which the coolant can flow and spaced apart from the cooling channel 7, which can in particular be referred to as the first channel 15. It is preferably provided that the coolant path 6 has a plurality of first channels 15 through which the coolant can flow and which are spaced apart from the respective cooling channel 7. The respective first channel 15 preferably extends within the second laminated core part 5, in particular within the second laminated core part 5 and the third laminated core part 12, the respective first channel 15 extending in the radial direction 11 of the stator 1 towards the outside at least indirectly, in particular directly one of the recesses 9 connects. Thus, for example, one of the first channels 15 is assigned to one of the recesses 9. For example, the channels 15 are arranged evenly distributed in the circumferential direction 8 of the stator 1.

For example, a width 16 of the respective channel 15, which extends in particular in the circumferential direction 8, corresponds to a respective, in particular the width of the respective recess 9 extending in the circumferential direction 8. In the radial direction 11, the upper or outer corners of the respective channel 15 are rounded, for example. This means that the outer corners are provided, for example, with a radius which preferably corresponds to a height 17 of the respective channel 15, in particular extending in the radial direction 11. The course of the magnetic field lines can be influenced as little as possible by the respective radius or such rounding.

Preferably, at least part of the coolant flowing through the length range 10 can be introduced into the respective first channel 15 via the length range 10. Thus, for example, the coolant can be guided into other laminated core parts 5, 12 via the first laminated core part 3, which is designed, for example, as a middle part, in order to supply the respective cooling channel 7 or the respective channel 15 with the coolant.

5 shows the stator 1 in a schematic perspective view according to a further embodiment. 6 shows a schematic exploded view of the in 5 shown stator 1. In the in 5 and 6 In the embodiment shown, the laminated core 2 has at least one separately formed from the first and second laminated core parts 3, 5, and in particular separately from the third laminated core part 12, and is at least indirectly, in particular directly, attached to the second laminated core part 5 in the axial direction 4 of the stator 1 subsequent, further laminated core part 18, which can be referred to in particular as a fourth laminated core part. In the exemplary embodiment, the laminated core 2 has, for example, a fifth laminated core part 19 which is formed separately from the laminated core parts 3, 5, 12, 18 and which adjoins the third laminated core part 12 at least indirectly, in particular directly, in the axial direction 4 of the stator 1. The laminated core parts 18, 19 are preferably each arranged on opposite sides of the first laminated core part 3. The respective cooling channel 7 and the respective first channel 15 preferably extend in regions within the further laminated core part 18 or the fifth laminated core part 19. The further laminated core part 18 and the fifth laminated core part 19 are preferably designed to be identical or identical.

7 shows the stator 1, in particular the laminated core 2, in a schematic and perspective partial view, in which a coolant flow of the coolant flowing through the respective channel 15 is illustrated by arrows 20. It is preferably provided that the channel 15 within the second laminated core part 5 has a first cross section 21 through which the coolant can flow and within the further laminated core part 18 a second cross section 22 through which the coolant can flow and which is different from the first cross section 21. This is in the in 7 In the exemplary embodiment shown in the channel 15 within the further laminated core part 18, for example, at least one separating web 23 is introduced, by means of which the coolant flow of the coolant flowing through the respective channel 15 in the second laminated core part 5, in particular when introduced into the further laminated core part 18, into two different ones, in particular fluid-mechanically parallel coolant flows can be divided. The separating web 23 can be referred to in particular as a boundary web. This is the second cross section 22 in the figure in 7 shown embodiment around two different cross sections through which the coolant can flow, which are separated from one another by means of the separating web 23, in particular in the circumferential direction 8 of the stator 1. This can create a flow edge, which leads to particularly high turbulence in the respective channel 15, in particular within the further laminated core part 18. As a result, heat transfer between the coolant flowing through the channel and the laminated core 2, in particular the further laminated core part 18, can be particularly improved.

8th shows the second laminated core part 5 in a schematic partial sectional view. For example, two groups of channels 15, in particular groups that are different from one another, are provided. The channels 15 of a first of the groups can in particular be referred to as first channels 15a. The channels of a second one of the groups can in particular be referred to as second channels 15b. It is preferably provided that the respective first channel 15a has a first channel region 24 through which the coolant can flow, which has the first cross section 21 and extends within the second laminated core part 5, and has at least one second channel region 25 through which the coolant can flow , which has the second cross section 22 and extends within the further laminated core part 18. In other words, it is preferably provided that the respective first channel 15a has the first cross section 21 within the second laminated core part 5 and the second cross section 22 within the further laminated core part 18. It is preferably provided that the respective second channel 15b has a first channel region 26 through which the coolant can flow, which has the second cross section 22 and extends within the second laminated core part 5, and has at least one second channel region 27 through which the coolant can flow, which has the first cross section 21 and extends within the further laminated core part 18. In other words, it is preferably provided that the respective second channel 15b has the second cross section 22 within the second laminated core part 5 and the first cross section 21 within the further laminated core part 18.

It is preferably provided that the second laminated core part 5 and the further laminated core part 18 are constructed identically, at least with respect to a respective arrangement of the respective cross sections 21, 22 in the respective laminated core part 5, 18.

It is preferably provided that the respective first channel 15a and the respective second channel 15b have an angular distance 28 from one another extending in the circumferential direction 8 of the stator 1, by which the second laminated core part 5 and the further laminated core part 18 in the circumferential direction 8 of the stator 1, in particular by a machine axis of rotation of the electrical machine, offset relative to one another, in particular rotated or twisted, are arranged. As a result, the first cross section 21 of the second laminated core part 5 and the second cross section 22 of the further laminated core part 18 are fluidly connected to one another and the second cross section 22 of the second laminated core part 5 and the first cross section 21 of the further laminated core part 18 are thereby fluidly connected to one another. In other words, in the second laminated core part 5 and in the further laminated core part 18, the separating web 23 is introduced in the circumferential direction 8 of the stator 1 in every second cross section 21, 22 extending within the respective laminated core part 5, 18, the laminated core parts 5, 18 can be arranged offset or rotated relative to one another by the angular distance 28. The angular distance 28 is, for example, 10 degrees.

For example, it is provided that the cooling channels have two, in particular different, groups of cooling channels 7. The cooling channels 7 of a first of the groups can in particular be referred to as first cooling channels 7a. The cooling channels 7 of a second one of the groups can in particular be referred to as second cooling channels 7b. For example, it is provided that the respective cooling channel 7 within the second laminated core part 5 has a first cross section 29 through which the coolant can flow and within the further laminated core part 18 a second cross section 30 through which the coolant can flow and which is different from the first cross section 29. For example, the respective second cooling channel 7b has the second cross section 30 within the second laminated core part 5 and the first cross section 29 within the further laminated core part 18. For example, it is provided that the respective first cooling channel 7a and the respective second cooling channel 7b have the angular distance 28 from one another running in the circumferential direction 8 of the stator 1, by which the second laminated core part 5 and the further laminated core part 18, in particular, in relation to the imaginary reference angular position the machine axis of rotation is arranged offset relative to one another, in particular twisted or rotated. As a result, the first cross section 29 of the second laminated core part 5 and the second cross section 30 of the further laminated core part 18 are fluidly connected to one another and the second cross section 30 of the second laminated core part 5 and the first cross section 29 of the further laminated core part 18 are thereby fluidly connected to one another.

9 shows the second laminated core part 5 in a schematic partial sectional view according to a further embodiment. For example, the first and second cross sections 21, 22 are each a shape that is twisted or rotated by 180 degrees relative to one another. This means that, for example, when the first cross section 21 is rotated, in particular about the machine axis of rotation, the second cross section 22 emerges from the first cross section 21 and vice versa.

10 shows a schematic and perspective partial view of the stator 1, in particular of the laminated core 2 10 the coolant flow of the coolant according to the in 9 illustrated embodiment shown. For example, the respective channels 15a, 15b each form a concave longitudinal edge. A flow direction of the coolant flowing through the respective channel 15a, 15b runs at least essentially in the axial direction 4 of the stator 1, with the flow direction having components running in the radial direction 11 of the stator 1 through a respective transition from the respective cross section 20, 21 receives. This can generate turbulence. Thus, the flow edge for causing the turbulence can be realized by the laminated core parts 5, 18, each offset by the respective angular distance 28.

In the in 9 and 10 In the exemplary embodiment shown, the respective channel 15 is, for example, kidney-shaped. This means that the first cross section 21 and the second cross section 22 of the respective channel 15a, 15b are each kidney-shaped.

11 shows the second laminated core part 5 according to a further embodiment, in which the respective channel 15 has a kidney shape has different, further shapes. The respective channel 15 has a triangular or triangular shape. Equivalent to that in 9 and 10 In the embodiment shown, the respective cross sections 21, 22 or their respective shapes are designed to be rotated by 180 degrees relative to one another.

12 shows a schematic and perspective partial view of the stator 1, in particular of the laminated core 2, in which the coolant flow of the coolant flowing through the respective channel 15 according to the in 11 shown embodiment is illustrated. This shows that the coolant flowing through the respective channel 15a, 15b flows through the respective channel 15a, 15b in a particularly turbulent manner, whereby the heat transfer can be particularly improved.

Of course, it is possible to have a channel guide of the respective channel 15, in particular the respective first channel 15a and/or the respective second channel 15b, and/or the respective cooling channel 7, in particular the respective first cooling channel 7a and/or the respective second cooling channel 7b to transfer another laminated core part 5 to the fifth laminated core part 19.

In a further embodiment, it is provided that the laminated core 2 is at least one formed separately from the laminated core parts 3, 5, 12, 18, 19 and is at least indirectly attached to the second laminated core part 5, in particular to the outward, in the axial direction 4 of the stator 1 further laminated core part 18, adjoining cover laminated core part 31, which is preferably designed as the outermost laminated core part of the laminated core 2 in the axial direction 4 of the stator 1. In the in 5 and 6 In the exemplary embodiment shown, the laminated core 2 is separate from the laminated core parts 3, 5, 12, 18, 19, 31 and adjoins the third laminated core part 12, in particular the fifth laminated core part 19, at least indirectly to the outside in the axial direction 4 of the stator 1 , second cover laminated core part 32, which is preferably designed as the outermost laminated core parts of the laminated core 2 in the axial direction 4 of the stator 1. The cover sheet metal package parts 31, 32 are preferably each arranged on opposite sides of the first sheet metal package part 3. The respective cover plate package part 31, 32 preferably has at least one respective outlet opening 33 through which the coolant can flow, in particular in the axial direction 4 of the stator 1, via which a respective winding head 34, 35 is connected to the coolant path 6, in particular the respective cooling channel 7 and / or the coolant flowing through the respective channel 15, in particular directly, can be wetted. The respective winding head 34, 35 preferably adjoins the laminated core 2, in particular the respective cover laminated core part 31, 32, to the outside in the axial direction 4 of the stator 1, at least indirectly, in particular directly. A respective cross section of the respective outlet opening 33, in particular referred to as a nozzle cross section, is preferably designed to be particularly small in order to reduce the coolant flowing through the respective cover plate package part 31, 32 to a particularly small cross section, that is to say, for example, to particularly increase a flow velocity of the coolant in order to to wet the respective winding head 34, 35 or the stator winding and thereby cool it particularly well.

13 shows the second laminated core part 5 in a schematic partial sectional view according to a further embodiment. In the in 13 In the embodiment shown, the coolant path 6 has at least one second length region 36 through which the coolant can flow and which is fluidly connected to the length region 10, in particular directly, and which in the radial direction 11 of the stator 1 inwards from a relative to the radial direction 11 of the stator 1 outer lateral surface 37 of the second laminated core part 5, and in particular of the further laminated core part 18, is limited, preferably directly. It is preferably provided that the coolant path 6 has a plurality of second length regions 36 through which the coolant can flow and which are fluidly connected to the length region 10, in particular directly, and which in the radial direction 11 of the stator 1 inwards from the radial direction 11 of the stator 1 outer lateral surface 37 of the second laminated core part 5, and in particular of the further laminated core part 18, are limited. This means that external cooling of the laminated core 2 is provided. The respective second length region 36 is preferably at least partially, in particular in the radial direction 11 of the stator 1 to the outside, limited by the housing element of the stator 1 or the electrical machine, in particular directly. For example, the respective length range 36 in the circumferential direction 8 of the stator 1 is limited, in particular directly, by respective walls 38, the respective wall 38 preferably being formed by the laminated core 2, in particular by the second laminated core part 5 and/or the further laminated core part 18. Thus, the respective second length region 36 can be understood, for example, as a respective channel, which is represented or formed on the outer lateral surface 37, which is in particular referred to as the outer surface, via groove-like depressions. For example, the respective walls 38 in the second laminated core part 5 are arranged offset by a second angular distance 39 relative to the respective walls 38 in the further laminated core part 18. This indicates a direction of flow of the coolant flowing through the respective second length region, which can flow through at least essentially in the axial direction 4 of the stator 1, has a component running in the circumferential direction 8 of the stator 1. As a result, turbulence can be generated, in particular by flow edges, whereby heat transfer between the coolant flowing through the respective second length region 36 and the laminated core 2, in particular the outer lateral surface 37, can be particularly improved. The second angular distance 39 is, for example, 8 degrees. Alternatively, the second angular distance 39 can be 10 degrees, for example.

14 shows the stator 1, in particular the laminated core 2, in a schematic and perspective partial view. A coolant flow of the coolant flowing through the respective second length region 36 is illustrated by an arrow 40.

As in 5 , 6 , 10 , 12 and in 14 shown, it is of course possible for the laminated core 2 to have several second laminated core parts 5 and several further laminated core parts 18 and/or several third laminated core parts 12 and/or several fifth laminated core parts 19. Thus, the first laminated core part 3 can be arranged, for example, in the axial direction of the stator 1 in a center of an overall package of all laminated core parts of the laminated core 2.

Overall, it can be seen that in the stator 1 or the laminated core 2, a particularly advantageous channel routing, in particular of the respective cooling channel 7 and / or the respective channel 15, can be effected in order to make the stator 1, in particular the laminated core 2, particularly advantageous, particularly special to cool efficiently or particularly intensively. Through special geometric properties of the channel guide, for example in the form of the respective cross section 21, 22, 29, 30, functional properties of the cooling can be particularly improved, in particular with regard to avoiding or keeping an influence on the magnetic field of the stator 1 or the electrical machine particularly low .

Reference symbol list

1

stator

2

Sheet metal package

3

first sheet metal package part

4

axial direction

5

second sheet metal package part

6

Coolant path

7

Cooling channel

7a

first cooling channel

7b

second cooling channel

8th

Circumferential direction

9

recess

10

Length range

11

radial direction

12

third sheet metal package part

13

cross-section

14

Main direction of extension

15

channel

15a

first channel

15b

second channel

16

Width

17

Height

18

fourth sheet metal package part

19

fifth sheet metal package part

20

Arrow

21

first cross section

22

second cross section

23

Divider

24

first channel area of the first channel

25

second channel area of the first channel

26

first channel area of the second channel

27

second channel area of the second channel

28

Angular distance

29

first cross section

30

second cross section

31

Cover plate package part

32

second cover plate package part

33

Exit opening

34

winding head

35

winding head

36

second length range

37

outer surface

38

wall

39

second angular distance

40

Arrow

QUOTES INCLUDED IN THE DESCRIPTION

This list of 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.

Cited patent literature

• EP 1614205 B1 [0002]

Claims (10)

Stator (1) for an electrical machine, with a multi-part laminated core (2), which has a first laminated core part (3) and at least one formed separately from the first laminated core part (3) and at least in the axial direction (4) of the stator (1). has a second laminated core part (5) directly adjoining the first laminated core part (3), and with a coolant path (6) through which a coolant can flow, which extends at least partially within the laminated core (2), characterized in that • the coolant path (6 ) has at least one cooling channel (7) through which the coolant can flow in the axial direction (4) of the stator (1), which extends within the second laminated core part (5) and in the circumferential direction (8) of the stator (1) between two in the circumferential direction ( 8) recesses (9) of the second laminated core part (5) are arranged adjacent to the stator (1) and are each provided for arranging at least one winding of the stator (1), and • the coolant path (6) is one through which the coolant can flow and at least partially has a length region (10) limited by the first laminated core part (3), via which at least part of the coolant flowing through the length region (10) can be introduced into the cooling channel (7). stator (1). Claim 1 , characterized in that the cooling channel (7) has a slot-shaped cross section (13), the main extension direction (14) of which runs at least substantially in the radial direction (11) of the stator (1). stator (1). Claim 1 or 2 , characterized in that the length region (10) in the circumferential direction (8) of the stator (1) can be flowed through by the coolant. Stator (1) according to one of the preceding claims, characterized in that the coolant path (6) has at least one channel (15) through which the coolant can flow and spaced from the cooling channel (7), which extends within the second laminated core part (5) and in the radial direction (11) of the stator (1) to the outside at least indirectly adjoins one of the recesses (9). stator (1). Claim 4 , characterized in that the laminated core (2) has at least one formed separately from the first and second laminated core parts (3, 5) and at least indirectly adjoins the second laminated core part (5) in the axial direction (4) of the stator (1), further laminated core part (18), within which the cooling channel (7) and the channel (15) each extend in areas. stator (1). Claim 5 , characterized in that the channel (15) within the second laminated core part (5) has a first cross section (21) through which the coolant can flow and within the further laminated core part (18) one through which the coolant can flow and which is different from the first cross section (21). , second cross section (22). Stator (1) according to one of the Claims 4 until 6 , characterized in that the coolant path (6) has at least one second channel (15b) through which the coolant can flow and spaced from the channel (15) in the circumferential direction of the stator (1), which is located within the second and the further laminated core part (5 , 18) and extends outwards in the radial direction (11) of the stator (1) at least indirectly to one of the recesses (9). stator (1). Claim 7 , characterized in that • the second channel (15b) has the second cross section (22) within the second laminated core part (5) and the first cross section (21) within the further laminated core part (18), • the second laminated core part (5) and the further laminated core part (18), at least with respect to a respective arrangement of the respective cross sections (21, 22) in the respective laminated core part (5, 18), are constructed identically, and • the channel (15a) and the second channel (15b) one in the circumferential direction of the stator (1) have an angular distance (28) from one another, by which the second laminated core part (5) and the further laminated core part (18) are arranged offset relative to one another in the circumferential direction (8) of the stator (1), whereby the first cross section ( 21) of the second laminated core part (5) and the second cross section (22) of the further laminated core part (18) are fluidly connected to one another and the second cross section (22) of the second laminated core part (5) and the first cross section (21) of the further laminated core part (18 ) are fluidly connected to each other. Stator (1) according to one of the preceding claims, characterized in that the laminated core (2) is formed separately from the laminated core parts (3, 5) and is at least indirectly attached to the outside in the axial direction (4) of the stator (1). second laminated core part (5) adjoining cover laminated core part (31), which has at least one outlet opening (33) through which the coolant can flow, via which a winding head (34) of the stator (1) can be wetted with the coolant flowing through the coolant path (6). Stator (1) according to one of the preceding claims, characterized in that the Coolant path (6) has at least one second length region (36) through which the coolant can flow and fluidly connected to the length region (10), which in the radial direction (11) of the stator (1) inwards from a relative to the radial direction ( 11) of the stator (1) is limited to the outer lateral surface (37) of the second laminated core part (5).

Images