CN219068015U - Oil cooling structure of motor and motor - Google Patents

Abstract

The utility model provides an oil cooling structure of a motor and the motor, which comprises a stator core, wherein an oil passage is formed in at least part of the area of the stator core, and the outer diameter surface of the stator core is contacted with a motor shell; insulating paper with through holes is arranged in the slots of the stator core, the position of the through hole corresponds to the position of the area of the stator core, which is provided with the oil passage; the oil passage is arranged such that both ends are respectively communicated with the inner side and the outer side of the slot of the stator core, so that a cooling medium entering from an oil inlet on the motor shell flows along the oil passage, passes through the through hole, enters into an oil path cavity structure in the slot of the stator core, flows along the stator winding, and dissipates heat. The oil passage penetrates through the yoke part of the groove of the stator core, and the cooling medium directly enters the groove of the stator core through the oil passage to be contacted with the coil of the stator winding, so that the stator winding is cooled, an oil spraying ring is not required to be additionally arranged, the installation space of the whole machine is optimized, and the cost of the whole machine is saved.

Description

Oil cooling structure of motor and motor

Technical Field

The utility model belongs to the technical field of motors, and particularly relates to an oil cooling structure of a motor and the motor.

Background

For the existing motor, most of the current oil way structural designs contain oil spraying rings or oil baffles, occupy the internal space of the motor, and have low power density, so how to improve the power density of the motor in the existing space is a difficult problem.

Disclosure of Invention

In view of the foregoing, the present utility model provides an oil cooling structure of a motor and a motor, so as to solve the above or other problems in the prior art.

In order to solve the technical problems, the utility model adopts the following technical scheme: an oil cooling structure of an electric machine, comprising,

at least part of the area is provided with a stator core with an oil passage, and the outer diameter surface of the stator core is contacted with the motor shell;

insulating paper provided with through holes, wherein the insulating paper is arranged in the slots of the stator core, and the positions of the through holes correspond to the positions of the areas of the stator core, where the oil passing channels are arranged;

the oil passage is arranged such that both ends are respectively communicated with the inner side and the outer side of the slot of the stator core, so that a cooling medium entering from an oil inlet on the motor shell flows along the oil passage, passes through the through hole, enters into an oil path cavity structure in the slot of the stator core, flows along the stator winding, and dissipates heat.

Further, the region configured with the oil passage is provided in the middle of the stator core so that the cooling medium entering the oil passage cavity structure flows out along the stator winding from the middle to the two sides, respectively.

Further, the oil passing channel is arranged at the yoke part of at least part of the slots of the stator core, and the oil passing channel is obliquely arranged from the outer diameter side to the inner diameter side of the slots of the stator core;

the inclination directions of the plurality of oil passing channels of the yoke part of each groove are the same; or, among the plurality of oil passing channels of the yoke portion of each groove, the inclined directions of the two adjacent oil passing channels are intersected.

Further, the plurality of first silicon steel sheets are stacked to construct an area of the stator core, wherein the oil passing channel is formed in the area, one side or two sides of the plurality of first silicon steel sheets are provided with a plurality of second silicon steel sheets, and the plurality of second silicon steel sheets are stacked to construct other area parts of the stator core.

Further, at least one oil passing hole is formed in the corresponding yoke portion of at least part of the grooves of the first silicon steel sheet, and distances from the oil passing holes in the yoke portion of each groove to the axis of the first silicon steel sheet are sequentially increased or sequentially decreased along the circumferential direction of the first silicon steel sheet.

Further, at least one oil passing hole is formed in the yoke portion of at least part of the grooves of the first silicon steel sheet, a plurality of oil passing holes are sequentially formed in the yoke portion of each groove along the radial direction of the first silicon steel sheet, and the oil passing holes in the yoke portions of two adjacent grooves are formed in different circumferences.

Further, the number of oil passing holes on the yoke portions of the adjacent two grooves is different.

Further, among the oil passing holes on the yoke portions of the two grooves, one oil passing hole is provided at the outer diameter end of the groove and communicates with the outer diameter side of the groove, the other oil passing hole is provided at the inner diameter end of the groove and communicates with the inner diameter side of the groove, and the oil passing hole provided at the outer diameter end and the oil passing hole provided at the inner diameter end are located at the yoke portion of the same groove or at the yoke portions of the two grooves or at the yoke portions of the adjacent two grooves, respectively.

Further, when the adjacent two first silicon steel sheets are stacked, the adjacent two first silicon steel sheets rotate for a certain angle to be stacked, and after the stacking, the oil passing holes on the yoke parts of the corresponding grooves on the first silicon steel sheets are communicated, so that the structure of the oil passing channel is constructed.

Further, the plurality of first silicon steel sheets are arranged into at least two groups, in each group, the plurality of first silicon steel sheets are aligned and stacked to form a first silicon steel sheet group, the plurality of first silicon steel sheet groups are rotationally stacked, and two adjacent first silicon steel sheet groups rotate for a certain angle when being stacked, so that the structure of the oil passing channel is formed.

Further, the rotation angle is an angle between two adjacent grooves of the first silicon steel sheet.

Further, in any one slot of the stator core, coils, slot wedges and insulating paper on two teeth constituting the slot constitute an oil passage cavity structure, and the oil passage cavity structure is communicated with the oil passage so that the cooling medium flowing out of the oil passage flows in the oil passage cavity structure.

Further, the inner side wall part of the motor shell corresponding to the area provided with the oil passing channel of the stator core is of a groove structure, so that a circulation space is formed by the outer diameter surface of the area provided with the oil passing channel of the stator core and the inner side wall of the motor shell, the circulation space is communicated with the oil inlet, and the cooling medium enters the circulation space from the oil inlet and flows in the circulation space to enter the oil inlet channel communicated with each groove.

An electric motor comprises the oil cooling structure of the electric motor.

By adopting the technical scheme, the oil passage is arranged in a partial area of the stator core, the oil passage is positioned at the yoke part of the groove of the stator core, two ends of the oil passage are respectively communicated with the space on the outer diameter side of the stator core and the space in the groove, and a cooling medium entering from the oil inlet on the motor shell directly enters the groove of the stator core through the oil passage, contacts with the coil of the stator winding, flows along the surface of the coil towards two ends of the stator winding, flows through the whole stator winding, absorbs heat on the stator winding and dissipates heat of the stator winding;

the insulating paper is provided with a through hole, and the position of the through hole corresponds to the area of the stator core, which is provided with the oil passing channel, so that the cooling medium flowing out of the oil passing channel passes through the through hole and enters the slots of the stator core;

the coil, the slot wedge at the end part of the slot and the insulating paper of the stator core are arranged on two tooth parts of the slot of the stator core to form an oil path cavity structure, and the cooling medium flowing out of the oil passage flows in the oil path cavity structure and fully contacts with the stator winding and the stator core to absorb heat of the stator winding and the stator core and dissipate heat of the stator winding and the stator core;

the oil passing channel is arranged on the stator core, so that the communication between the outer diameter side space of the stator core and the space in the groove is realized, the flow of the cooling medium inside and outside the stator core is realized, no additional oil spraying ring or oil baffle plate is required, and the installation space of the whole machine is optimized;

the stator core can be directly arranged in the motor shell and contacted with the motor shell, and can be in interference fit to optimize the installation space of the whole machine;

the oil way design is realized by adopting the existing part optimization structure, so that the additional oil resistance test verification and the like caused by using different materials are reduced, the cost of the whole machine is saved, and the power density of the motor is improved.

Drawings

FIG. 1 is a schematic cross-sectional structural view of a motor stator according to an embodiment of the present utility model;

FIG. 2 is another cross-sectional structural schematic of a motor stator according to an embodiment of the present utility model;

FIG. 3 is a schematic partial cross-sectional view of an oil passage cavity structure according to an embodiment of the present utility model;

fig. 4 is a schematic diagram showing a front view of a motor stator according to an embodiment of the present utility model;

FIG. 5 is a schematic view showing the structure of a first silicon steel sheet according to an embodiment of the present utility model;

FIG. 6 is a schematic view showing a structure of two first silicon steel sheets rotationally stacked in accordance with an embodiment of the present utility model;

FIG. 7 is a schematic view showing a structure of two first silicon steel sheets according to an embodiment of the present utility model after being rotationally stacked at an angle;

FIG. 8 is a schematic structural view of a second first sheet of silicon steel according to an embodiment of the present utility model;

FIG. 9 is a schematic view showing a structure of an oil passage formed by rotationally stacking a plurality of first silicon steel sheets according to an embodiment of the present utility model;

FIG. 10 is a schematic view of the structure of FIG. 9 at an angle;

FIG. 11 is a schematic view of the structure of FIG. 9 at another angle;

fig. 12 is a schematic structural view of a motor according to an embodiment of the present utility model.

In the figure:

1. stator core 2, oil passage 3, and region provided with oil passage

4. Motor housing 5, insulating paper 6, stator winding

7. Circulation space 8, slot wedge 9 and oil inlet

10. Oil-way cavity structure 11, first silicon steel sheet 12 and second silicon steel sheet

13. Groove 110, oil passing hole 90 and oil inlet pipeline

Detailed Description

The utility model will be further described with reference to the drawings and the specific examples.

Fig. 1 shows a schematic structural diagram of an embodiment of the present utility model, which relates to an oil cooling structure of a motor and a motor, and is used for dissipating heat of a stator of the motor, especially a concentrated winding motor stator, wherein a plurality of oil passing channels are arranged in a local area of a stator core, and are communicated with the inner side and the outer side of a slot of the stator core, and a cooling medium directly enters the slot of the stator core through the oil channels to fully contact with a winding, so that heat of the stator winding and the stator core is absorbed, the motor structure is simplified, no additional oil spraying ring or oil baffle is required, and heat dissipation of the motor stator is improved.

As shown in fig. 1 and 2, an oil cooling structure of an electric motor, which radiates heat from a stator core 1 and a stator winding 6, includes,

at least part of the area is provided with a stator core 1 with an oil passing channel 2, the oil passing channel 2 is arranged, so that a cooling medium directly flows from the outer diameter side to the inner diameter side of the stator core 1, the outer diameter surface of the stator core 1 is in contact with the motor shell 4, the stator core 1 can be in interference fit with the motor shell 4, the inner space of the motor shell 4 is fully utilized, and an oil spraying ring or an oil baffle in the conventional design of an oil way can be omitted;

an insulating paper 5 provided with through holes, the insulating paper 5 is arranged in the slots 13 of the stator core, the positions of the through holes correspond to the positions of the areas 3 provided with the oil passing channels of the stator core 1, and the through holes are arranged so that the cooling medium flowing out of the oil passing channels 2 can enter the slots 13 of the stator core through the through holes;

the oil passage 2 is provided with two ends respectively communicated with the inner side and the outer side of the slot 13 of the stator core, and the cooling medium positioned on the outer diameter surface of the stator core 1 can enter the inner side of the stator core 1 through the oil passage 2, so that the cooling medium entering from the oil inlet 9 on the motor shell 4 flows along the oil passage 2, passes through the through hole and enters the oil path cavity structure 10 in the slot 13 of the stator core, flows along the stator winding 6, and dissipates heat. Be provided with the oil passage 2 on stator core 1, the yoke portion of the groove 13 of stator core is run through to oil passage 2 for stator core 1 can directly install in motor casing 4, need not to set up oil spray ring or oil baffle, after cooling medium gets into inside motor casing 4 from the oil inlet 9 on the motor casing 4, be located the external diameter side of stator core 1, can pass in the groove 13 of oil passage 2 direct entering stator core, with stator winding 6 contact, flow along stator winding 6, dispel the heat to stator winding 6, simultaneously, can directly absorb the heat of stator core 1, improve stator heat dissipation problem, improve stator heat dissipation ability.

The region configured with the oil passage 2 is provided in the middle of the stator core so that the cooling medium entering the oil passage cavity structure 10 flows out along the stator windings from the middle to both sides, respectively.

The oil passage 2 is inclined from the outer diameter side to the inner diameter side of the slots 13 of the stator core, and communicates the space on the inner diameter side and the space on the outer diameter side of the slots 13 of the stator core, thereby realizing the circulation of the cooling medium between the inner side and the outer side of the stator core 1. The number of the oil passing channels 2 is multiple, the multiple oil passing channels 2 are arranged along the circumferential direction of the stator core 1, the multiple oil passing channels 2 are arranged along the axial direction of the stator core 1, the number and the arrangement mode of the oil passing channels 2 are selected according to actual requirements, and specific requirements are not made here.

In the present embodiment, the yoke portion of the slot 13 of each stator core is provided with a plurality of oil passing channels 2, and the plurality of oil passing channels 2 are provided along the axial direction and the circumferential direction of the stator core 1, and the number and arrangement of the oil passing channels 2 are selected and set according to the width of the region 3 configured with the oil passing channels and the width of the slot 13 of the stator core, and no specific requirement is made here.

The inclination directions of the plurality of oil passages 2 of the yoke portion of the slot 13 of each stator core may be the same, that is, the inclination direction of each oil passage 2 may be the inclination from the outlet end to the non-outlet end of the stator winding 6 along the outer diameter side to the inner diameter side direction of the slot 13 of the stator core, or the inclination direction of each oil passage 2 may be the inclination from the non-outlet end to the outlet end of the stator winding 6 along the outer diameter side to the inner diameter side direction of the slot 13 of the stator core, and the cooling medium is sprayed on the stator winding in an inclined manner;

alternatively, the yoke portion of the slot 13 of each stator core is provided with a plurality of oil passing channels 2, and the oblique directions of two adjacent oil passing channels 2 are intersected, so that the cooling medium in each oil passing channel 2 is obliquely sprayed to the middle part of the stator winding 6, flows and flows out from the middle part of the stator winding 6 along the stator winding 6 to two side directions, and in the two adjacent oil passing channels 2, the oblique direction of one oil passing channel 2 is: the direction along the outer diameter side and the inner diameter side of the slots 13 of the stator core is inclined from the non-outlet end of the stator winding 6 to the outlet end direction, and the inclination direction of the other oil passing channel 2 is as follows: the outer diameter side of the slots 13 of the stator core inclines from the outlet end of the stator winding 6 to the non-outlet end side, the inclination directions of the two groups of oil passing channels 2 are opposite, and the axes of the two groups of oil passing channels 2 are intersected.

Of course, among the plurality of oil passage passages 2 of the yoke portion of the slot 13 of each stator core, there may be: the inclined directions of the partial oil passing channels 2 are the same, and the inclined directions of the partial oil passing channels 2 are intersected.

The arrangement of the plurality of oil passage channels 2 in the yoke portion of the slot 13 of each stator core in the inclined direction is selected according to actual demands, and no specific requirement is made here.

As shown in fig. 1 to 4, the plurality of first silicon steel sheets 11 are stacked to construct the region 3 provided with the oil passage of the stator core 1, one or both sides of the plurality of first silicon steel sheets 11 are provided with a plurality of second silicon steel sheets 12, the plurality of second silicon steel sheets 12 are stacked to construct other region parts of the stator core 1, that is, the plurality of first silicon steel sheets 11 and the plurality of second silicon steel sheets 12 are stacked to construct the structure of the stator core 1, wherein the plurality of first silicon steel sheets 11 are conventionally used silicon steel sheets, the first silicon steel sheets 11 are used for constructing the region 3 provided with the oil passage, the plurality of first silicon steel sheets 11 can be positioned on any side of the plurality of second silicon steel sheets 12, or the plurality of first silicon steel sheets 11 are positioned among the plurality of second silicon steel sheets 12, and are selectively arranged according to actual requirements, and specific requirements are not made herein. In this embodiment, preferably, after the plurality of first silicon steel sheets 11 are stacked, a plurality of second silicon steel sheets 12 are respectively stacked on two sides of the plurality of first silicon steel sheets 11, so as to construct the structure of the stator core 1, the plurality of first silicon steel sheets 11 are located in the middle of the plurality of second silicon steel sheets 12, that is, the plurality of first silicon steel sheets 11 are located in the middle of the stator core 1, that is, the region 3 with the oil passage is located in the middle of the stator core 1, so that the cooling medium enters the inner side of the stator core 1 from the middle of the stator core 1, contacts with the middle of the stator winding 6, flows along the surface of the stator winding 6 towards two ends, flows through the whole stator winding 6, flows out from two ends of the stator winding 6, and cools the stator winding 6.

As shown in fig. 5 to 12, the structure of the oil passage 2 is constituted by a plurality of oil passing holes 110 provided in the axial direction of the stator core 1, which are sequentially communicated, each of the oil passing holes 110 being provided on one of the first silicon steel sheets 11, and the oil passing holes 110 at the corresponding positions after the plurality of first silicon steel sheets 11 are stacked being communicated to construct the structure of the oil passage 2. At least one oil passing hole 110 is provided in a corresponding yoke portion of at least part of the grooves 13 of the first silicon steel sheet 11, and distances from the oil passing hole 110 on the yoke portion of each groove 13 to the axis of the first silicon steel sheet 11 are sequentially increased or sequentially decreased along the circumferential direction of the first silicon steel sheet 11. On each first silicon steel sheet 11, it may be that the yoke portion of each slot 13 is provided with an oil passing hole 110, under this structure, the yoke portion of each slot 13 of the stator core 1 is provided with an oil passing channel 2, or the corresponding yoke portion of a part of slots 13 is provided with an oil passing hole 110, under this structure, the corresponding yoke portion of a part of slots 13 of the stator core 1 is provided with an oil passing channel 2, and the number and the setting position of the oil passing holes 110 are selected and set according to actual needs, and no specific requirement is made here.

In the present embodiment, it is preferable that the oil passing holes 110 are provided in the yoke portion of each of the slots 13 of the first silicon steel sheet 11, so that the cooling medium can flow through each coil of the stator winding 6 with high heat dissipation efficiency.

The shape of the oil passing hole 110 may be rectangular, square or circular, or other shapes, and is selected and set according to actual requirements, which is not particularly required.

In order to construct the structure of the oil passing channel 2 by connecting the corresponding oil passing holes 110 after the plurality of first silicon steel sheets 11 are sequentially stacked, the distances from the oil passing holes 110 on the yoke parts of each groove 13 to the axis of the first silicon steel sheet 11 are different along the circumferential direction of the first silicon steel sheets 11, the oil passing holes 110 on the yoke parts of each groove 13 are not on the same circumference, and the projections of the oil passing holes 110 on the yoke parts of two adjacent grooves 13 on the vertical surface have overlapping parts so as to construct the structure of the oil passing channel 2.

Along the circumferential direction of the first silicon steel sheets 11, the oil passing holes 110 on the yoke parts of the grooves 13 are arranged at equal intervals, when a plurality of first silicon steel sheets 11 are stacked, two adjacent first silicon steel sheets 11 rotate for a certain angle during stacking, after stacking, the oil passing holes 110 on the yoke parts of the corresponding grooves 13 on the first silicon steel sheets 11 are communicated, and the structure of the oil passing channel 2 is constructed, wherein the rotation angle is the angle between the two adjacent grooves 13 of the first silicon steel sheets 11. Specifically, after the first silicon steel sheet 11 is installed, the second first silicon steel sheet 11 is aligned with the first silicon steel sheet 11 based on the first silicon steel sheet 11, each tooth portion, each groove 13 and the oil passing hole 110 on the yoke portion of each groove 13 are in one-to-one correspondence, after rotating by one angle, stacking is performed, the oil passing holes 110 on the yoke portion of the corresponding groove 13 are partially overlapped and are communicated with each other, then stacking is performed on the third first silicon steel sheet 11 based on the second first silicon steel sheet 11, stacking is performed after rotating by one angle, the oil passing holes 110 on the yoke portion of the corresponding groove 13 are partially overlapped and are communicated with each other, then stacking is performed on the fourth first silicon steel sheet 11, … … is performed sequentially, stacking is performed on the plurality of first silicon steel sheets 11, at least one oil passing channel 2 is formed on the yoke portion of each groove 13, and the yoke portion of the corresponding groove 13 is penetrated.

In order to enable the cooling medium located on the outer diameter side of the stator core 1 to enter the oil passage 2, flow along the oil passage 2, and flow out of the oil passage 2 into the slots 13 of the stator core 1, among the oil passing holes 110 on the yoke of each slot 13 of the first silicon steel sheet 11, the oil passing hole 110 on the yoke of one slot 13 is provided at the outer diameter end of the yoke of the slot 13, communicating with the outer diameter side; the oil passing holes 110 on the yoke of the other groove 13 are provided at the inner diameter end of the yoke of the groove 13 and communicate with the inner diameter side, and therefore, the oil passing holes 110 provided at the outer diameter end and the inner diameter end of the yoke of the groove 13 are of a groove structure, the oil passing holes 110 at the outer diameter end face the space at the outer diameter side, the oil passing holes 110 at the inner diameter end face the space at the inner diameter side, so that the cooling medium can enter the oil passing holes 110 at the outer diameter end, enter adjacent oil passing holes 110 communicated therewith, sequentially enter the oil passing holes 110 communicated therewith, and finally flow out from the oil passing holes 110 at the inner diameter end, the oil passing holes 110 at the inner diameter end face the inside of the groove 13 of the stator core 1, and the cooling medium directly enters the inside of the groove 13 of the stator core 1 after flowing out.

The oil passing holes 110 on the yoke portion of each groove 13 on the first silicon steel sheet 11 may be provided in such a manner that: as shown in fig. 5 to 7 and 9 to 11, the yoke of each groove 13 is provided with the oil passing holes 110 in the circumferential direction of the first silicon steel sheet 11, and the number of the oil passing holes 110 is one to ensure the magnetic circuit width of the yoke, wherein the oil passing holes 110 of the yoke of one groove 13 are provided at the outer diameter end of the yoke of the groove 13 to communicate with the outer diameter side surface, and the distances from the oil passing holes 110 on the yoke of each groove 13 to the axis of the first silicon steel sheet 11 decrease in order in the clockwise direction or the counterclockwise direction until the inner diameter end of the yoke of the groove 13 adjacent to the groove 13 provided with the oil passing holes 110 at the outer diameter end is provided with the oil passing holes 110.

Alternatively, the oil passing holes 110 of the yoke of one groove 13 are provided at the inner diameter end of the yoke of the groove 13, communicate with the inner diameter side surface, and sequentially increase in distance from the oil passing hole 110 on the yoke of each groove 13 to the axis of the first silicon steel sheet 11 in the clockwise direction or the counterclockwise direction until the oil passing hole 110 is provided at the outer diameter end of the yoke of the groove 13 adjacent to the groove 13 provided with the oil passing hole 110 at the inner diameter end.

Alternatively, as shown in fig. 8, the oil passing holes 110 of the yoke portions of the respective grooves 13 along the circumferential direction of the first silicon steel sheet 11 are divided into a plurality of groups, in each of which the oil passing holes 110 of the yoke portion including one groove 13 are located at the outer diameter end, the oil passing holes 110 of the yoke portion including one groove 13 are located at the inner diameter end, and the oil passing holes 110 of the yoke portion of the respective grooves 13 located between the two grooves 13, the distances from the respective oil passing holes 110 of the group to the axis of the first silicon steel sheet 11 are sequentially increased or sequentially decreased, the number of the oil passing holes 110 in each group is selectively set according to the size and arrangement of the oil passing holes 110, and the number of the groups in which the oil passing holes 110 of the yoke portion of the respective grooves 13 along the circumferential direction of the first silicon steel sheet 11 are arranged is selectively set according to actual demands, which is not particularly required.

Alternatively, at least one oil passing hole 110 is provided in the corresponding yoke portion of at least part of the grooves 13 of the first silicon steel sheet 11, a plurality of oil passing holes 110 are provided in the yoke portion of each groove 13 in sequence along the radial direction of the first silicon steel sheet 11, the respective oil passing holes 110 in the yoke portions of the adjacent two grooves 13 are provided on different circumferences, the plurality of oil passing holes 110 in the yoke portion of each groove 13 are located in the same radial direction, the oil passing holes 110 in the yoke portions of the adjacent two grooves 13 are staggered, and projections of the plurality of oil passing holes 110 in the yoke portions of the adjacent two grooves 13 in the vertical direction partially coincide, so that the structure of the oil passing channel 2 is formed after the plurality of first silicon steel sheets 11 are rotationally stacked. The number of the oil passing holes 110 on the yoke portions of the adjacent two grooves 13 is different, the number of the oil passing holes 110 on the yoke portion of one groove 13 is odd, the number of the oil passing holes 110 on the yoke portion of the other groove 13 is even, and because the oil passing holes 110 on the yoke portions of the adjacent two grooves 13 are not on one circumference, the adjacent two first silicon steel sheets 11 are overlapped similar to the yoke portions of the adjacent two grooves 13 of one first silicon steel sheet 11 in the rotating and stacking process, the plurality of oil passing holes 110 on the yoke portions of the two grooves 13 are sequentially arranged along the radial direction, and the adjacent two oil passing holes 110 are all overlapped, so that a communicated channel is formed, and after the plurality of first silicon steel sheets 11 are rotated and stacked, the plurality of communicated channels are sequentially communicated, so that the integral structure of the oil passing channel 2 is constructed.

Among the plurality of oil passing holes 110 formed in the yoke portions of the adjacent two slots 13, two oil passing holes 110 are provided at the inner diameter end and the outer diameter end of the yoke portion of the slot 13, respectively, and communicate with the inner diameter side and the outer diameter side, respectively, so that both ends of the oil passing passage 2 formed communicate with the spaces on the inner diameter side and the outer diameter side of the stator core 1, respectively, and the cooling medium located on the outer diameter side can enter the oil passing passage 2, flow along the oil passing passage 2, and flow into the slots 13 of the stator core 1. The oil passing holes 110 on the inner diameter end and the outer diameter end may be located on the yoke portion of the same groove 13, or may be located on the yoke portions of two adjacent grooves 13, respectively, and are selectively set according to actual requirements, which is not specifically required.

In the present embodiment, it is preferable that the oil passing holes 110 on the yoke of the adjacent two grooves 13, the number of the oil passing holes 110 on the yoke of one groove 13 being two, are provided between the inner diameter end and the outer diameter end of the groove 13; the number of the oil passing holes 110 in the yoke portion of the other groove 13 is three, one oil passing hole 110 is provided at the outer diameter end of the groove 13 and communicates with the outer diameter side of the groove 13, and the other oil passing hole 110 is provided at the inner diameter end of the groove 13 and communicates with the inner diameter side of the groove 13.

The first silicon steel sheet 11 in the design of the oil passing hole 110 may be: when the adjacent two first silicon steel sheets 11 are stacked, the two first silicon steel sheets 11 rotate for a certain angle to be stacked, after the stacking, the oil passing holes 110 on the yoke parts of the corresponding grooves 13 on the first silicon steel sheets 11 are communicated, so that the structure of an oil passing channel 2 is constructed, and the rotation angle is the angle between the two adjacent grooves 13 of the first silicon steel sheets 11; the first silicon steel sheets 11 may be first divided into at least two groups, in each group, the first silicon steel sheets 11 are not rotationally stacked, and are directly aligned and stacked, the tooth portions, the grooves 13 and the oil passing holes 110 on the yoke portions of the grooves 13 are in one-to-one correspondence, after the stacking, the structures of the first silicon steel sheets 11 in multiple groups are identical, so as to form a first silicon steel sheet group, then the first silicon steel sheet groups are rotationally stacked, the rotation angle is the angle between two adjacent grooves 13 of the first silicon steel sheets 11, and the oil passing holes 110 on the yoke portions of the corresponding grooves 13 are communicated to form at least one oil passing channel 2 structure.

The above-described first silicon steel sheet 11 constituting the oil passage area 3 may be identical in structure, or the first silicon steel sheet 11 may be different in structure, and a series of first silicon steel sheets 11 similar in structure are structured to constitute the structure provided with the oil passage area 3, such as: in a series of first silicon steel sheets 11 with similar structures, at least one oil passing hole 110 is formed in the yoke portion of each groove 13 on one first silicon steel sheet 11, the plurality of oil passing holes 110 are located on the same circumference and are sequentially arranged along the circumferential direction, the plurality of oil passing holes 110 in the yoke portion of each groove 13 are all arranged on the same circumference, but in the plurality of first silicon steel sheets 11, the oil passing holes 110 in the yoke portion of each corresponding groove 13 are not located on the same circumference, and the distance from the oil passing hole 110 in the yoke portion of each corresponding groove 13 in the plurality of first silicon steel sheets 11 to the axis of the stator core 1 is gradually increased or gradually reduced along the radial direction, and when the plurality of first silicon steel sheets 11 are stacked, the plurality of oil passing holes 110 in the yoke portions of the corresponding grooves 13 are directly aligned and are not rotated, and are sequentially communicated, so that the structure of the oil passing channel 2 is constructed.

In any slot 13 of the stator core 1, coils, slot wedges 8 and insulating paper 5 on two teeth of the slot 13 form an oil path cavity structure 10, the oil path cavity structure 10 is communicated with the oil passing channel 2, and a cooling medium flowing out of the oil passing channel 2 enters the oil path cavity structure 10 and flows in the oil path cavity structure 10, meanwhile, the cooling medium contacts with coils on two sides of the oil path cavity structure 10 and flows along the surfaces of the coils towards the two ends of the coils, flows through the surfaces of the whole stator winding 6, fully contacts with the stator winding 6, absorbs heat on the stator winding 6, cools the stator winding 6, and simultaneously, absorbs heat on the stator core 1 in the flowing process of the cooling medium in the oil path cavity structure 10, thereby improving the stator heat dissipation problem and the stator heat dissipation capability.

In the above-described structure, the number of oil passing holes of the yoke of the slot can be increased to realize a plurality of oil passing passages 2 of the yoke of the slot 13 of the stator core by increasing the number of the first silicon steel sheets 11 and performing the rotary lamination, or by decreasing the magnetic path width of the yoke, with the same number of the first silicon steel sheets 11 in the rotary lamination.

In order to enable the cooling medium entering from the oil inlet 9 of the motor housing 4 to enter the interior of the motor housing 4 directly and quickly into the oil passing channel 2, as shown in fig. 1 and 2, the inner side wall portion of the motor housing 4 corresponding to the region 3 provided with the oil passing channel of the stator core 1 is in a groove structure, and is formed by recessing the inner side wall of the motor housing 4 towards the outer side wall direction, so that a circulation space 7 is formed by the outer diameter surface of the region 3 provided with the oil passing channel of the stator core 1 and the inner side wall of the motor housing 4, the circulation space 7 is communicated with the oil inlet 9, the cooling medium enters from the oil inlet 9 into the circulation space 7 and flows in the circulation space 7 into the oil passing channel 2 communicated with each groove 13, and the shape of the circulation space 7 is annular due to the shape of the region 3 provided with the oil passing channel.

In this embodiment, the area 3 provided with the oil passage is located in the middle of the stator core 1, the groove is located in the middle of the motor housing 4, the oil inlet 9 is disposed on the motor housing 4 corresponding to the groove, the oil inlet 9 is communicated with the groove 13, the oil inlet 9 is externally connected with an oil inlet pipe 90, and the cooling medium entering from the oil inlet 9 directly enters the circulation space 7.

An electric motor, as shown in fig. 12, includes an oil-cooled structure of the electric motor as described above.

In the process of assembling the motor stator, stacking or rotating and stacking a plurality of first silicon steel sheets 11 according to the arrangement mode of the oil passing holes 110, after stacking, constructing a structure of an oil passing channel 2 at the yoke part of each groove 13, stacking a plurality of second silicon steel sheets 12 at two sides of the plurality of first silicon steel sheets 11, and constructing a structure of the stator core 1 after stacking the second silicon steel sheets 12; then, insulating papers 5 are installed in the slots 13 of the respective stator cores 1, and the through holes on the insulating papers 5 are made to correspond to the positions of the plurality of first silicon steel sheets 11 so that the through holes communicate with the oil passage 2; the stator winding 6 and the slot wedge 8 are then installed.

The stator is installed in the motor housing 4, and the positions of the plurality of first silicon steel sheets 11 correspond to the positions of grooves on the inner side wall of the motor housing 4, so that the flow-through space 7 is constructed.

The motor structure is formed by mounting other components such as a rotor.

In the working process of the motor, a cooling medium enters the circulation space 7 from the oil inlet 9 on the motor shell 4 and flows in the circulation space 7, enters each oil passing channel 2, flows along the oil passing channels 2, passes through the through holes on the insulating paper 5 after flowing out, enters each groove 13 of the stator core 1, is positioned in the oil path cavity structure 10 and flows in the oil path cavity structure 10, wets the coils of the stator winding 6, flows along the coil surface to the two ends of the stator winding 6, flows through the whole stator winding 6, cools the stator winding 6, absorbs the heat of the stator core 1 in the process of flowing in the oil path cavity structure 10, cools the stator core 1, and the cooling medium after absorbing the heat flows out from the oil outlets on the motor shell 4, wherein the oil outlets are positioned on the end covers at the two ends of the motor shell 4.

By adopting the technical scheme, the oil passage is arranged in a partial area of the stator core, the oil passage is positioned at the yoke part of the groove of the stator core, two ends of the oil passage are respectively communicated with the space on the outer diameter side of the stator core and the space in the groove, and a cooling medium entering from the oil inlet on the motor shell directly enters the groove of the stator core through the oil passage, contacts with the coil of the stator winding, flows along the surface of the coil towards two ends of the stator winding, flows through the whole stator winding, absorbs heat on the stator winding and dissipates heat of the stator winding;

the insulating paper is provided with a through hole, and the position of the through hole corresponds to the area of the stator core, which is provided with the oil passing channel, so that the cooling medium flowing out of the oil passing channel passes through the through hole and enters the slots of the stator core;

the coil, the slot wedge at the end part of the slot and the insulating paper of the stator core are arranged on two tooth parts of the slot of the stator core to form an oil path cavity structure, and the cooling medium flowing out of the oil passage flows in the oil path cavity structure and fully contacts with the stator winding and the stator core to absorb heat of the stator winding and the stator core and dissipate heat of the stator winding and the stator core;

the oil passing channel is arranged on the stator core, so that the communication between the outer diameter side space of the stator core and the space in the groove is realized, the flow of the cooling medium inside and outside the stator core is realized, no additional oil spraying ring or oil baffle plate is required, and the installation space of the whole machine is optimized;

the stator core can be directly arranged in the motor shell and contacted with the motor shell, and can be in interference fit to optimize the installation space of the whole machine;

the oil way design is realized by adopting the existing part optimization structure, so that the additional oil resistance test verification and the like caused by using different materials are reduced, the cost of the whole machine is saved, and the power density of the motor is improved.

The foregoing describes the embodiments of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by the present utility model.

Claims (14)

1. An oil cooling structure of motor, its characterized in that: comprising the steps of (a) a step of,

a stator core with an oil passage at least partially constructed, an outer diameter surface of the stator core being in contact with the motor housing;

the insulation paper is provided with a through hole, the insulation paper is arranged in the groove of the stator core, and the position of the through hole corresponds to the position of the area of the stator core, which is provided with the oil passage;

the oil passage is arranged so that two ends of the oil passage are respectively communicated with the inner side and the outer side of the groove of the stator core, so that cooling medium entering from an oil inlet on the motor shell flows along the oil passage, passes through the through hole and enters into an oil circuit cavity structure in the groove of the stator core to flow along the stator winding to dissipate heat.

2. The oil cooling structure of an electric machine according to claim 1, characterized in that: the region with the oil passage is arranged in the middle of the stator core, so that the cooling medium entering the oil path cavity structure flows out along the stator winding from the middle to the two sides.

3. An oil cooling structure of an electric machine according to claim 1 or 2, characterized in that: the oil passing channel is arranged at the yoke part of at least part of the slots of the stator core, and is obliquely arranged from the outer diameter side to the inner diameter side of the slots of the stator core;

the inclination directions of the plurality of oil passing channels of the yoke part of each groove are the same; or, among the plurality of oil passing channels of the yoke portion of each groove, the inclined directions of two adjacent oil passing channels are intersected.

4. An oil cooling structure of an electric machine according to claim 3, characterized in that: the stator core comprises a plurality of first silicon steel sheets, wherein the first silicon steel sheets are stacked to form an area of the stator core, the oil passing channel is formed in the area, one side or two sides of each first silicon steel sheet are provided with a plurality of second silicon steel sheets, and the second silicon steel sheets are stacked to form other area parts of the stator core.

5. The oil cooling structure of an electric machine according to claim 4, wherein: at least one oil passing hole is formed in the corresponding yoke portion of at least part of the grooves of the first silicon steel sheet, and the distances from the oil passing holes in the yoke portion of each groove to the axis of the first silicon steel sheet are sequentially increased or sequentially decreased along the circumferential direction of the first silicon steel sheet.

6. The oil cooling structure of an electric machine according to claim 4, wherein: at least one oil passing hole is formed in the corresponding yoke portion of at least part of the grooves of the first silicon steel sheet, a plurality of oil passing holes are sequentially formed in the yoke portion of each groove along the radial direction of the first silicon steel sheet, and the oil passing holes in the yoke portions of two adjacent grooves are formed in different circumferences.

7. The oil cooling structure of an electric machine according to claim 6, wherein: the number of oil passing holes on the yoke portions of two adjacent grooves is different.

8. An oil cooling structure of an electric machine according to any one of claims 5-7, characterized in that: among the oil passing holes on the yokes of the two grooves, one oil passing hole is arranged at the outer diameter end of the groove and communicated with the outer diameter side of the groove, the other oil passing hole is arranged at the inner diameter end of the groove and communicated with the inner diameter side of the groove, and the oil passing hole at the outer diameter end and the oil passing hole at the inner diameter end are positioned at the yokes of the same groove or at the yokes of the two grooves or at the yokes of the adjacent two grooves respectively.

9. An oil cooling structure of an electric machine according to any one of claims 5-7, characterized in that: and when the adjacent two first silicon steel sheets are stacked, the two first silicon steel sheets rotate for a certain angle to be stacked, and after the stacking, the oil passing holes on the yoke parts of the corresponding grooves on the first silicon steel sheets are communicated to form the structure of the oil passing channel.

10. An oil cooling structure of an electric machine according to claim 6 or 7, characterized in that: the plurality of first silicon steel sheets are arranged into at least two groups, in each group, the plurality of first silicon steel sheets are aligned and stacked to form a first silicon steel sheet group, a plurality of groups of first silicon steel sheet groups are rotationally stacked, and two adjacent first silicon steel sheet groups rotate for a certain angle when being stacked to form the structure of the oil passing channel.

11. An oil cooling structure of an electric machine according to claim 9 or 10, characterized in that: the rotation angle is the angle between two adjacent grooves of the first silicon steel sheet.

12. An oil cooling structure of an electric machine according to any one of claims 1-2 and 4-7, characterized in that: in any slot of the stator core, coils, slot wedges and insulating paper on two teeth forming the slot form the oil path cavity structure, and the oil path cavity structure is communicated with the oil passing channel so that cooling medium flowing out of the oil passing channel flows in the oil path cavity structure.

13. An oil cooling structure of an electric machine according to any one of claims 1-2 and 4-7, characterized in that: the inner side wall part of the motor shell corresponding to the area of the stator core, which is provided with the oil passage, is of a groove structure, so that a circulation space is formed by the outer diameter surface of the area of the stator core, which is provided with the oil passage, and the inner side wall of the motor shell, the circulation space is communicated with the oil inlet, and a cooling medium enters the circulation space from the oil inlet and flows in the circulation space and enters an oil inlet passage communicated with each groove.

14. An electric motor, characterized in that: an oil-cooled structure comprising an electric machine as claimed in any one of claims 1-13.

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