CN109936226B - Stator and electric machine with cooling system - Google Patents
Stator and electric machine with cooling system Download PDFInfo
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- CN109936226B CN109936226B CN201811523649.6A CN201811523649A CN109936226B CN 109936226 B CN109936226 B CN 109936226B CN 201811523649 A CN201811523649 A CN 201811523649A CN 109936226 B CN109936226 B CN 109936226B
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- stator
- cooling channel
- cooling
- channel wall
- electric machine
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention relates to a stator (1) for an electric machine (2), comprising a stator core (3) which extends around a stator longitudinal axis (4) of the stator (1) and along the stator longitudinal axis (4), wherein the stator core (3) comprises a plurality of stator teeth (5) which are distributed in the circumferential direction of the stator (1) and extend toward the stator longitudinal axis (4) and along the stator longitudinal axis (4), wherein stator slots (6) are formed between adjacent stator teeth (5). A cooling channel wall (7) of the stator (1) is arranged between the at least one stator slot (6) and the stator tooth (5) adjacent to the at least one stator slot (6) in such a way that a cooling channel (8) extending parallel to the stator longitudinal axis (4) is formed between the cooling channel wall (7) and the stator tooth (5). The invention further relates to an electric machine (2) having such a stator (1).
Description
Technical Field
The invention relates to a coolable stator for an electric machine. The invention further relates to an electric machine having a stator of this type.
Background
Electrical machines usually have a rotor, which is surrounded by a stator. The stator has a stator base body (statorrundk nanoper) or a stator core (statorbech, sometimes also referred to as stator core) with stator teeth (Statorzahn) and stator slots (Statornut), wherein the stator slots are arranged between the stator teeth. Around the stator teeth and in the stator slots, stator windings (Statorwicklung) are arranged, which are mostly realized in the form of coils (Spule) formed from insulated litz wire (Litze). The coils each have a defined mass and a defined ohmic resistance, which are defined by the material, the length and the cross section of the litz wire. The density of the strands and the specific ohmic resistance are defined by the material. A coil portion of the coil is arranged in the stator slot and thus forms an active part (sometimes also referred to as excitation part) of the stator winding. The other coil part forms the winding head (Wickelkopf) of the electric machine and is arranged in most cases at the axial end side of the electric machine. This coil part is also referred to as a winding head part (wickelpfanteil). The power density of the electric machine depends on the configuration of the coils, in particular on the diameter of the litz wires and on the number of stator windings.
During operation of the electric machine, power losses (verlustlestungg) occur in the form of heat losses (Verlustw ä rme). The power density of an electric drive depends inter alia on the operating temperature of the electric machine and the power electronics. Overheating of the electric machine (for example due to heat losses) leads to a reduction in the power density and, in addition, can lead to permanent damage at the electric machine. For example, the insulation of the strands of the stator winding may be damaged by excessively high temperatures and thus cause short circuits between adjacent strands.
To avoid overheating and overheating, many electric machines have cooling means for heat removal (Entw ä rmung). Many different cooling devices or cooling systems are known, which are designed, for example, in particular for cooling a stator or a rotor. In the case of a cooling device for cooling the stator of an electric machine, a distinction is generally made between a cooling device for heat extraction of the active portions of the stator windings and a cooling device for heat extraction of the winding heads of the electric machine.
Known cooling devices for heat removal of the active part of the stator winding often have a cooling jacket (kuhlmantel) with a cooling structure, which surrounds the stator. The cooling jacket is therefore arranged in the region of the stator back iron of the stator. This cooling is effected, for example, with water, oil, water-glycol mixtures or the like. Here, it is an indirect cooling, since the cooling jacket does not have a direct contact with the stator winding. Cooling of the winding head is not achieved in most cases. Such a cooling device is therefore particularly suitable for cooling an electric machine having a relatively small winding head portion, i.e. a large overall length. A disadvantage in the case of such cooling devices is the heat loss from the stator winding (W ä rmeabtransport), which is realized through the electrical insulation of the stator slots, through the stator core and through the separating joint between the stator core and the cooling jacket towards the cooling fluid. Thus, the heat loss must overcome a number of thermal obstacles or resistances. This causes an additional limitation of the effective power (Leistungsf ä highkey) of the motor.
Cooling devices for heat removal of winding heads of electric machines are often designed for spraying the winding heads directly with a fluid, in particular oil. In this way, a direct cooling of the stator winding at the winding head is achieved, wherein no cooling of the stator, in particular of the stator core, is achieved. These cooling devices are therefore particularly suitable for cooling electric machines having relatively high winding head portions, i.e. relatively short overall lengths.
DE 102011053299 a1 discloses a cooling system for an electric machine in which cooling channels are formed in the stator core, which cooling channels extend radially along the stator teeth and between adjacent stator slots tangentially to the longitudinal axis of the stator. These cooling channels have the disadvantage that a relatively large area of the stator winding is thereby lost. Furthermore, an inflow channel and an outflow channel are provided in the stator back iron, whereby the power density of the electric machine is reduced.
DE 102011056007 a1 discloses a cooling system for an electric machine, in which cooling plates with radially extending cooling channels are arranged between adjacent stator cores (kuhlblech). Such a construction is very complicated and can only be produced at great expense.
DE 102012217711 a1 discloses an electric machine with a cooling system in which cooling channels with a triangular cross section are formed in a potting compound (Vergussmasse) surrounding the stator windings. Thus, the cooling channel is arranged between two stator tooth segments. With such a cooling system, effective cooling of the remaining stator area is not ensured.
DE 102014017745 a1 discloses an electric machine in which a cooling device is arranged in a stator slot and closes the stator slot on one side. This motor has the disadvantage that the number of stator windings and/or the size of the stator back iron is thereby significantly reduced.
Disclosure of Invention
The object of the present invention is therefore to eliminate or at least partially eliminate the disadvantages described above in the case of a stator for an electric machine and an electric machine. The object of the invention is, in particular, to create a stator for an electric machine and an electric machine which ensure improved cooling of the stator in a simple and cost-effective manner in a given installation space and a given power density.
The above task is achieved by the present invention. The object is therefore achieved by a stator according to the invention and by an electric machine according to the invention. Further features and details of the invention emerge from the description and the drawings. The features and details described in connection with the stator according to the invention are obviously also applicable in connection with the electric machine according to the invention and vice versa, respectively, so that the disclosure with respect to the various inventive aspects is always mutually referred to.
According to a first aspect of the invention, this object is achieved by a stator for an electrical machine. The stator has a stator core extending around and along a stator longitudinal axis of the stator. The stator core has a plurality of stator teeth which are distributed in the circumferential direction of the stator and extend toward and along the longitudinal axis of the stator. Stator slots are formed between adjacent stator teeth. According to the invention, a cooling channel wall of the stator is arranged between at least one stator slot and a stator tooth adjacent to the at least one stator slot in such a way that a cooling channel extending parallel to the longitudinal axis of the stator is formed between the cooling channel wall and the stator tooth.
The stator core is preferably made of electrical sheet steel (elektrobech, also sometimes referred to as electrical sheet steel) and preferably has an alloy of iron and silicon. Preferably, the electrical steel sheet is manufactured by cold rolling (Kaltwalzen). The stator core is preferably composed of a plurality of stator chips (statorbechscheib) which are connected to one another, in particular adhesively bonded, and electrically insulated from one another, in particular coaxially arranged. Preferably, the stator chips are bonded to one another by means of a back lacquer (back). Alternatively, the stator core can also be produced by means of an additive manufacturing method, wherein partial electrical insulation of the stator longitudinal axis section is preferred in order to avoid eddy currents (Wirbelstrom) through the stator.
The stator longitudinal axis preferably coincides with the rotor longitudinal axis in the case of an inserted rotor. The stator core extends around a stator longitudinal axis and has a central free space in the region of the stator longitudinal axis for receiving the rotor. Thus, the cross-section of the stator core (except for the stator slots, cooling channels and the like) is preferably of circular or substantially circular configuration. Furthermore, the stator core extends along the stator longitudinal axis, so that the stator core (apart from the stator slots, cooling channels and the like) is preferably of hollow-cylindrical or substantially hollow-cylindrical configuration.
The stator teeth preferably extend from a common stator back iron via which the stator teeth are connected to one another towards the stator longitudinal axis and terminate in a central free space for accommodating the rotor. The stator teeth are preferably regularly, in particular uniformly, distributed in the circumferential direction of the stator. At the end facing the stator longitudinal axis, the stator tooth preferably has a stator tooth head with a greater width than the remaining region of the stator tooth. The remaining regions of the stator teeth preferably have a constant or at least substantially constant width.
Stator slots with slot inner wall sections are formed between adjacent stator teeth. The stator slots are preferably produced by a production method which has a dividing effect, such as for example blanking, laser cutting or the like. Preferably, for sealing, an adhesive layer or a lacquer layer is arranged (in particular sprayed) on the inner wall section of the groove. This is advantageous in particular in the case of a stator core composed of stator core pieces that are not bonded to one another.
In the stator slots, stator windings are preferably arranged, wherein the stator windings preferably have a twisted wire (litzenleitsung). A stranded line has a large number of individual wires which are tightly bundled together surrounded by a common insulation jacket and are thus insulated radially outward. The individual wires are preferably twisted (verdrillen) onto one another. The stator windings in the stator slots preferably form active parts of the stator windings. The remaining stator windings arranged at the end sides of the stator preferably form winding heads.
The cooling channel walls preferably comprise a material with a particularly advantageous or high heat-conducting capacity in order to improve or not excessively hinder the heat exchange between the cooling fluid (such as, for example, water, oil or the like) and the stator windings. Preferably, the cooling channel wall is formed in one piece and is movable into the stator core. Thus, easy assemblability of the cooling passage wall portion is ensured. Furthermore, the cooling channel walls are preferably electrically insulated on the side facing the stator winding, in particular by means of a layer of adhesive or lacquer of insulating paper (isolationpaper) or the like. The insulation preferably also has a relatively high thermal conductivity in order to improve or not excessively hinder the heat exchange between the cooling fluid and the stator windings. Therefore, a thinner layer of adhesive or lacquer is preferred as an insulation of the cooling channel walls.
The cooling channel wall preferably surrounds the stator slot from multiple sides, so that the cooling channel is configured on multiple sides of the stator slot. Via the cooling channel wall, the cooling channel is preferably sealed against the stator slot, so that intrusion of cooling fluid into the stator slot is avoided. For this reason, it is preferred that the cooling channels are sealed with respect to the stator core, as for example guided in slots in the stator core and/or glued or the like to the stator core. The cooling channel can be divided according to the invention into a plurality of cooling channels which preferably run parallel to one another along the longitudinal axis of the stator.
The stator winding is preferably arranged at the stator slot in such a way that the stator winding is supported at the cooling channel wall. Preferably, the stator slot is separated from the immediately adjacent stator tooth by means of a surrounding or two separate cooling channel walls, so that the stator slot is surrounded on both sides by cooling channels. Preferably, the ends of the stator slots facing the stator back iron are likewise bounded by cooling channel walls, so that cooling channels are formed between the stator back iron and the stator slots. It is preferred that the cooling channel walls are convexly or at least slightly convexly configured towards the stator slot, so that bending of the cooling channel walls towards the adjacent stator tooth is avoided in the case of a stator winding arranged in the stator slot. In this way, it is ensured that the cooling channel is not closed or excessively narrowed in the case of the arrangement of the stator winding.
The stator according to the invention has the advantage over conventional stators that the cooling of the stator is provided in a simple manner and in a cost-effective manner, which acts particularly close to the location of the occurrence of heat losses in the stator, i.e. at the stator windings. Only a small amount of heat flow obstacle (W ä rmefflussbarrier) is arranged between the stranded wire and the cooling medium of the cooling channel. In this way, the stator can be discharged particularly efficiently and therefore maintenance of the predefined operating temperature can also be ensured in the case of particularly high loads. Furthermore, an additional cooling jacket can be dispensed with, so that the stator slots can be enlarged and the stator back iron can be guided further from the stator longitudinal axis in the radial direction. Thereby, the power density of the stator can be increased. With the aid of the stator according to the invention, the power density and the efficiency of the electric machine can thus be significantly improved in the case of a predefined installation space.
According to an advantageous further development (Weiterentwicklung) of the invention, provision can be made in the case of a stator for at least one supporting means for supporting the wall of the cooling channel relative to the stator teeth to be arranged between the wall of the cooling channel and the stator teeth. The support means is preferably configured to divide the cooling channel into a plurality of cooling channels. Preferably, the cooling channels are configured to be traversed independently of one another by a cooling fluid. Preferably, the cooling channel wall is supported against the stator teeth by means of a plurality of support means. The support means are preferably distributed such that, when the stator windings are arranged at the cooling channel walls, a pressure distribution as uniform as possible is ensured. Preferably, the support means are fastened at the cooling channel wall or are at least partially constructed integrally with the cooling channel wall. The support means has the advantage that bending of the cooling channel walls towards the stator teeth in case the stator windings are arranged in the stator slots is avoided or at least substantially avoided.
It is preferred according to the invention if the support means has an electrical insulator or is configured as an electrical insulator. The electrical insulator is preferably arranged at least in the contact region of the support means to the adjacent stator tooth. As the electrical insulator, for example, an adhesive, paint, resin, ceramic, or the like is preferable. By means of the electrical insulator, the electrical strength of the stator can be further improved.
Further preferably, the cooling channel wall has a u-shaped cross section or at least a substantially u-shaped cross section. The two legs of the cooling channel wall preferably extend parallel to each other, substantially in the direction of the longitudinal axis of the stator. The ends of the cooling channel walls adjacent to the longitudinal axis of the stator are preferably received in grooves at adjacent stator tooth heads and sealed in a fluid-tight and preferably electrically insulating manner. In this way, the cooling channel wall can be fixed between the two stator teeth easily and with simple means. The cooling channel is therefore preferably open only to the end face of the stator and is otherwise sealed in a fluid-tight manner by the cooling fluid. Such a cooling channel wall has the advantage that it can be easily manufactured and can be fitted at the stator core, in particular by being moved in into the stator core. Furthermore, by means of the stator core thus constructed, a cooling channel can be provided which surrounds the stator slots and thus the stator windings on three sides. The u-shaped cross section has the advantage that particularly efficient heat removal of the stator winding and easy assembly can be achieved thereby.
In a particularly preferred embodiment of the invention, provision can be made in the case of the stator for the cooling channel wall to have a bulge in at least one partial section. The bulge is preferably formed in the direction of the indirectly adjacent stator tooth, so that in the subsection the flanks of the cooling channel wall facing the stator slot are recessed and the flanks of the cooling channel wall facing the stator tooth are raised. The elevation is preferably configured such that at least one stranded wire can be arranged within the elevation. Preferably, a plurality of stranded wires may be arranged within the ridge. It is also preferred that the cooling channel wall has a plurality of such elevations, which are in particular distributed uniformly or regularly over the cooling channel wall. It is also preferred that the cooling channel wall in the region of the bulge touches an adjacent stator tooth and is therefore designed as a support means. This has the advantage that additional supporting means can be dispensed with. Preferably, the cooling channel walls are electrically insulated at the contact points with the stator teeth. This bulge has the advantage that an increase of the contact surface between the cooling channel wall and the stator winding and between the cooling channel wall and the cooling fluid can be obtained thereby. In this way, the heat transfer between the stranded wires and the cooling fluid and thus the cooling capacity of the stator can be improved.
It is preferred that the cooling channel wall has a zigzag-shaped cross section or a wave-shaped cross section in at least one partial section. Preferably, the cooling channel walls contact adjacent stator teeth at a peak or spike. It is preferred here that the cooling channel walls are electrically insulated at the contact points. Such a cross section has the advantage that the cooling channel walls thus have a larger surface for heat exchange between the stranded wires and the cooling fluid. Furthermore, such a cooling channel wall has a high rigidity against bending. Furthermore, additional support means may be eliminated.
Preferably, the cooling channel wall is constructed integrally with the stator core. The cooling channel wall is preferably formed by removing (for example by blanking, laser cutting or the like) electrical sheet material in the region of the cooling channel. Alternatively, the stator core with the cooling channel walls may be manufactured by means of an additive manufacturing method. The stator core with the integrated cooling channel and the integrated cooling channel wall can therefore be produced in a simple manner and at low cost. Additional sealing of the cooling channel walls to the stator core is not required due to the integral construction.
According to a second aspect of the invention, the object is achieved by an electric machine with a rotor and a stator surrounding the rotor, wherein the stator is designed as a stator according to the invention. The rotor is preferably constructed in accordance with a conventional rotor of a conventional electric machine. Preferably, the rotor also has cooling channels for direct cooling of the rotor.
The cooling channels of the stator can be supplied with cooling fluid, for example, via a common cooling fluid supply of the electric machine. Furthermore, the electric machine preferably has a cooling fluid outlet via which cooling fluid can be discharged from a cooling channel of the electric machine. Alternatively, the electric machine for the cooling channels has a separate cooling fluid supply line and cooling fluid discharge line, so that the individual cooling fluid channels can be loaded with cooling fluid independently of one another. By means of the temperature sensors in the region of the cooling channels and suitable control electronics, a targeted heat removal of the stator can thus be achieved.
All the advantages already described for the stator according to the first aspect of the invention result in the case of the described electrical machine. The electric machine according to the invention thus has the advantage over known electric machines that the cooling of the stator is provided in a simple manner and in a cost-effective manner, which acts particularly close to the location of the occurrence of heat losses in the stator, i.e. at the stator windings. Only a small heat flow barrier is arranged between the stranded wire and the cooling medium of the cooling channel. In this way, the stator can be discharged particularly efficiently and therefore the maintenance of the predefined operating temperature of the electric machine can also be ensured in the case of particularly high loads. Furthermore, in the case of an electric machine, an additional cooling jacket surrounding the stator can be dispensed with, so that the stator slots can be enlarged and the stator back iron can be guided further from the stator longitudinal axis outward in the radial direction. The power density of the electric machine can thereby be increased. The electric machine according to the invention has a significantly improved power density and a significantly increased efficiency in the case of a predefined installation space compared to conventional electric machines with alternative cooling systems.
It is preferred that an insulating paper is arranged on the side of the cooling channel wall facing the stator slot. The insulating paper provides electrical insulation of the cooling channel walls from the stator winding and improves the electrical strength of the electrical machine in an advantageous manner and with simple means.
Preferably, the electric machine has a first end cap (abshlussdeckel, also sometimes referred to as a sealing cap) on at least one first end side, wherein the first end cap covers the stator in such a way that the cooling channel is sealed off towards the first end side. It is further preferred that the electric machine has a second end cap at the second end side, which second end cap covers the stator in such a way that the cooling channel is sealed off towards the second end side. The first end cap preferably has an inflow (Zulauf) for supplying the cooling fluid, wherein the inflow is coupled in fluid communication with the cooling channel and is sealed off from the surroundings. The second end cap preferably has an outflow (Ablauf) for discharging the cooling fluid, wherein the outflow is coupled in fluid communication with the cooling channel and is sealed off from the surroundings. Alternatively, the first end cap has an inflow portion and an outflow portion. In this case, it is preferred that the second end cover connects the cooling channels in fluid communication with one another and is sealed from the surroundings. The end cap is designed in such a way that a fluid flow can be guided through the fluid channel by the inlet part towards the outlet part, wherein the escape of cooling fluid within the electric machine is preferably prevented. Preferably, the end cap is configured as an electrical insulator or at least electrically insulated with respect to the stator core and/or the stator windings.
Drawings
The stator according to the invention and the electric machine according to the invention are explained in more detail below with the aid of the drawings. Wherein each schematically:
figure 1 shows a part of an electric machine according to the prior art in a perspective view,
figure 2 shows a detail of a preferred first embodiment of a stator according to the invention in a top view,
figure 3 shows an enlarged detail from figure 2 in a top view,
figure 4 shows a part of the first end side of the stator from figure 2 with a sealing means in a perspective view,
figure 6 shows a detail of a preferred second embodiment of a stator according to the invention in a top view,
figure 7 shows a detail of a preferred third embodiment of a stator according to the invention in a top view,
fig. 8 shows a preferred embodiment of the electrical machine according to the invention in a side view.
Elements with the same function and operating principle are provided with the same reference symbols in fig. 1 to 8, respectively.
REFERENCE SIGNS LIST
1 stator
2 electric machine
3 stator core
Longitudinal axis of stator
5 stator teeth
6 stator slot
7 cooling channel wall
8 Cooling channel
9 support device
10 bump
11 rotor
12 insulating paper
13 first end side
14 first end cap
15 stator back iron
16 Cooling jacket
17 stator winding
18 winding head
19 stator tooth head
20 holding tank
21 sealing element
22 second end side
23 second end cap
24 coolant inflow interface
25 coolant outflow interface.
Detailed Description
Fig. 1 shows a perspective view of a part of an electric machine 2 according to the prior art. The electric machine 2 has a rotor 11, which is surrounded by the stator 1. The stator 1 has a stator core 3 with a large number of stator slots 6 and a stator back iron 15. In the stator slot 6, a stator winding 17 is arranged, which forms a winding head 18 outside the stator slot 6. A cooling jacket 16 with a plurality of cooling channels 8 is arranged on the outer surface of the stator 1 facing away from the rotor 11. Efficient cooling of the stator windings 17, particularly within the stator slots 6, is not feasible with such a machine 2.
Fig. 2 shows a detail of a preferred first embodiment of a stator 1 according to the invention in a schematic top view. In fig. 3 an enlarged detail from fig. 2 is shown. The stator 1 has a stator core 3 with a plurality of stator teeth 5 and a stator back iron 15 connecting the stator teeth 5. Stator slots 6 are arranged between adjacent stator teeth 5. Between the stator slots 6 and the stator core 3, cooling channel walls 7 are arranged, which are supported against the stator core 3 via a plurality of support means 9. The cooling channel wall 7 is held in the receiving groove 20 of two adjacent stator tooth heads 19 of the stator teeth 5 of the stator core 3 and sealed against the stator core 3. Between the cooling channel wall 7 and the stator core 3, a plurality of cooling channels 8 are formed, which are separated from one another by support means 9. Alternatively, the cooling channels 8 may likewise be coupled in fluid communication with one another or form a common cooling channel 8. The cooling channel 8 is designed for the through-flow guidance of a cooling fluid, such as, for example, water, oil or the like. In the stator slots 6, stator windings 17 are arranged, which are supported against the cooling channel walls 7. An optional insulating paper 12 for electrical insulation is arranged between the cooling channel wall 7 and the stator windings 17.
Fig. 4 schematically shows a perspective view of a detail of the first end side 13 of the stator 1 from fig. 2. An annular seal 21 is arranged in the region of the stator back iron 15. Furthermore, a seal 21 is arranged at the end side of the cooling channel wall 7. The seal 21 is designed for sealing against the first end cover 14 (see fig. 5), not shown here, in order to prevent an unintentional escape of cooling fluid from the stator 1.
Fig. 5 shows the stator 1 from fig. 4 schematically in a perspective view with the end caps 14, 23. At the first end side 13 of the stator core 3, a first end cover 14 is arranged and sealed via a seal 21. The coolant inflow connection 24 is therefore connected in fluid communication with the cooling channel 8, which is hidden in this view, and is sealed off from the surroundings. The second end cap 23 is arranged on the second end side 22 of the stator core 3 and is sealed via a seal 21. The coolant outlet connection 25 is therefore connected in fluid communication with the cooling channel 8, which is hidden in this view, and is sealed from the surroundings. Thus, the coolant inflow interface 24 and the coolant outflow interface 25 are connected to each other in fluid communication via the cooling channel 8. The coolant inflow and outflow interfaces 24, 25 are preferably designed for coupling to a coolant pump, not shown, with a coolant cooling device.
Fig. 6 shows a detail of a preferred second embodiment of a stator 1 according to the invention in a schematic top view. The stator 1 of the second embodiment is substantially different from the first embodiment by the overall configuration of the stator core 3, the cooling passage wall 7, and the support device 9. Such a stator core 3 can be produced particularly easily and cost-effectively and enables a reduction in the number of assembly steps of the stator 1, since the additional assembly of the cooling channel wall 7 is dispensed with.
Fig. 7 schematically depicts a detail of a preferred third embodiment of a stator 1 according to the invention in a top view. The stator 1 of the third embodiment is different from the first embodiment in the structure of the cooling passage wall portion 7. The cooling channel wall 7 has an undulating shape with a plurality of elevations 10, wherein the elevations 10 are configured as support means 9 and the cooling channel wall 7 is supported against the stator core 3. A part of the stator winding 17 is arranged in the elevations 10 and another part of the stator winding 17 is arranged in the remaining area of the stator slot 6. A cooling channel 8 is formed between the two elevations 10 and the stator core 3.
Fig. 8 shows a preferred embodiment of an electric machine 2 according to the invention in a schematic side view. The electric machine 2 has a rotor 11, which is surrounded by the stator 1 according to the invention. The stator 1 and the rotor 11 are arranged coaxially to the stator longitudinal axis 4. A coolant inflow connection 24 is arranged at the first end side 13 of the electric machine 2. At a second end side 22 of the electric machine 2 opposite the first end side 13, a coolant outflow interface 25 is arranged.
Claims (11)
1. Stator (1) for an electric machine (2), having a stator core (3) which extends around a stator longitudinal axis (4) of the stator (1) and along the stator longitudinal axis (4), wherein the stator core (3) has a plurality of stator teeth (5) which are distributed in the circumferential direction of the stator (1) and extend toward the stator longitudinal axis (4) and along the stator longitudinal axis (4), wherein stator slots (6) are formed between adjacent stator teeth (5),
it is characterized in that the preparation method is characterized in that,
a cooling channel wall (7) of the stator (1) is arranged between at least one stator slot (6) and a stator tooth (5) adjacent to the at least one stator slot (6) in such a way that a cooling channel (8) extending parallel to the stator longitudinal axis (4) is formed between the cooling channel wall (7) and the stator tooth (5), wherein the cooling channel (8) is sealed off from the stator slot (6) by way of the cooling channel wall (7), and wherein the cooling channel (8) is formed for the through-flow guidance of a cooling fluid.
2. Stator (1) according to claim 1, characterized in that at least one support means (9) for the support of the cooling channel wall (7) relative to the stator teeth (5) is arranged between the cooling channel wall (7) and the stator teeth (5).
3. Stator (1) according to claim 2, characterized in that the support means (9) has an electrical insulator or is configured as an electrical insulator.
4. A stator (1) according to any of the preceding claims 1-3, characterized in that the cooling channel wall (7) has at least a substantially u-shaped cross-section.
5. Stator (1) according to one of the preceding claims 1 to 3, characterized in that the cooling channel wall (7) has a bulge (10) in at least one partial section.
6. Stator (1) according to claim 5, characterized in that the cooling channel wall (7) has a zigzag-shaped cross section or a wave-shaped cross section in the at least one partial section.
7. A stator (1) according to any of the preceding claims 1-3, characterized in that the cooling channel wall is constructed integrally with the stator core.
8. A stator (1) according to any of the preceding claims 1-3, characterized in that the cooling channel wall (7) has a u-shaped cross-section.
9. An electrical machine (2) having a rotor (11) and a stator (1) surrounding the rotor (11), characterized in that the stator (1) is constructed according to any one of claims 1 to 8.
10. An electric machine (2) as claimed in claim 9, characterized in that an insulating paper (12) is arranged on the side of the cooling channel wall (7) facing the stator slots (6).
11. The electrical machine (2) according to claim 9 or 10, characterized in that the electrical machine (2) has a first end cover (14) at least one first end side (13), wherein the first end cover (14) covers the stator (1) such that the cooling channel (8) is sealed towards the first end side (13).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017222635.8A DE102017222635A1 (en) | 2017-12-13 | 2017-12-13 | Stator and electric machine with cooling system |
| DE102017222635.8 | 2017-12-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109936226A CN109936226A (en) | 2019-06-25 |
| CN109936226B true CN109936226B (en) | 2022-08-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811523649.6A Active CN109936226B (en) | 2017-12-13 | 2018-12-13 | Stator and electric machine with cooling system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109936226B (en) |
| DE (1) | DE102017222635A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017220123A1 (en) * | 2017-11-13 | 2019-05-16 | Audi Ag | Groove wall insulation for a stator of an electric motor |
| DE102020130987A1 (en) | 2020-01-24 | 2021-07-29 | Schaeffler Technologies AG & Co. KG | Method for producing a component of an electric motor, an electric motor component and an electric motor |
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2017
- 2017-12-13 DE DE102017222635.8A patent/DE102017222635A1/en active Pending
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2018
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| DE102017222635A1 (en) | 2019-06-13 |
| CN109936226A (en) | 2019-06-25 |
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