CN117713429A - Motor cooling structure - Google Patents

Abstract

The invention discloses a motor cooling structure, which relates to the technical field of motor cooling and comprises a motor shell, a stator iron core and a coil winding; an oil inlet and an oil outlet are respectively arranged on the motor shell; the stator core is arranged in the motor shell, and an oil path channel is formed between the stator core and the motor shell; the motor shell is provided with a shell oil channel communicated with the oil channel, and/or the stator core is provided with a core oil channel communicated with the oil channel; the axial end of the coil winding is provided with an oil groove channel, and the oil groove channel is communicated with the oil channel. According to the motor cooling structure provided by the invention, the oil groove channel is arranged at the axial end part of the coil winding, so that the applicability of an oil cooling mode is improved, and the channels communicated with the oil channel are arranged on the motor shell and the stator core, so that the heat dissipation effect of the motor oil cooling mode is improved, and the pressure drop of cooling liquid at the inlet and the outlet of the motor shell can be effectively reduced.

Description

Motor cooling structure

Technical Field

The invention relates to the technical field of motor cooling, in particular to a motor cooling structure.

Background

During normal operation of the motor, the coils and stator core generate heat and transfer it outwardly. When the heat dissipation capacity of the motor is insufficient, the temperature of the motor can be too high. For the stator part, too high a temperature may destroy the insulation of the coil, thereby causing a short circuit of the coil and burning out the motor. In order for the motor to operate safely and reliably, a cooling structure is required to be provided for the motor to dissipate heat. The cooling mode of the motor mainly comprises air cooling, water cooling and oil cooling, and the oil cooling effect is best among the three cooling modes.

In the prior art, most oil cooling schemes form oil ways in grooves by means of adjacent flat copper wires, so that whether the whole oil way can normally circulate or not, whether cooling liquid in each groove can be uniformly distributed depends on the manufacturing process of the flat wires to a great extent, and meanwhile, the mode of forming the oil ways in the grooves by means of the adjacent flat copper wires cannot be applied to the scene of round copper coils, so that the applicability of an oil cooling mode is poor. And, the heat that stator core produced just forms the oil circuit through adjacent flat copper line in the inslot and dispels the heat and cool off, leads to stator core's radiating efficiency lower for the radiating effect of motor oil cooling method is limited, thereby influences the heat dissipation of whole motor, leads to the work efficiency of motor to reduce.

In addition, when the number of turns of the coil is changed, the specification of the flat wire needs to be continuously adjusted, and the overall manufacturing cost of the motor is increased.

Therefore, how to improve the heat dissipation effect of the motor oil cooling mode is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

Accordingly, the present invention is directed to a motor cooling structure for improving the heat dissipation effect of the motor oil cooling method.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a motor cooling structure comprising:

the motor shell is provided with an oil inlet and an oil outlet respectively;

the stator iron core is arranged in the motor shell, an oil path channel is formed between the stator iron core and the motor shell, the oil inlet and the oil outlet are respectively communicated with the oil path channel, the stator iron core comprises tooth parts, and a wire winding groove is formed between every two adjacent tooth parts;

the motor shell is provided with a shell oil channel communicated with the oil channel, and/or the stator core is provided with a core oil channel communicated with the oil channel;

the coil winding is sleeved on the tooth part, so that the coil winding is positioned in the winding groove, an oil groove channel is arranged in the winding groove and is positioned at the axial end part of the coil winding, and the oil groove channel is communicated with the oil channel, so that cooling liquid flows into the oil groove channel through the oil channel to cool and dissipate heat of the coil winding.

Optionally, in the above motor cooling structure, the stator core includes a yoke portion, the yoke portion has a first side surface and a second side surface that are disposed opposite to each other, the tooth portion is connected to the first side surface of the yoke portion, the second side surface of the yoke portion is closely attached to the motor housing, the coil winding has a first side and a second side that are disposed opposite to each other, the first side of the coil winding is adjacent to the first side surface of the yoke portion, and the core oil passage is disposed in the second side surface of the yoke portion;

the motor casing includes with the diapire that the second side of yoke portion is tight, the casing oil circuit passageway set up in on the diapire of motor casing, just be provided with the closing plate in the motor casing, the closing plate is located coil winding's second side, the closing plate evenly is provided with a plurality of protruding muscle along circumference direction, protruding muscle with the wire winding groove corresponds.

Optionally, in the above motor cooling structure, the stator core has an inner ring end face and an outer ring end face, the inner ring end face is an end face close to a motor rotating shaft, the outer ring end face is an end face far away from the motor rotating shaft, the oil path channel includes a first oil path channel and a second oil path channel, the first oil path channel is disposed on one side of the inner ring end face of the stator core, the second oil path channel is disposed on one side of the outer ring end face of the stator core, and the oil groove channel is respectively communicated with the first oil path channel and the second oil path channel, and the oil inlet and the oil outlet are respectively communicated with the second oil path channel.

Optionally, in the above motor cooling structure, the second side surface of the yoke portion is provided with a plurality of first grooves, and each of the first grooves is distributed along a circumferential direction of the stator core to form the core oil passage;

the first groove extends from the inner ring end face of the stator core to the outer ring end face of the stator core, so that the first groove is communicated with the first oil path channel and the second oil path channel respectively.

Optionally, in the above motor cooling structure, the motor housing includes an inner annular wall and an outer annular wall that are disposed opposite to each other, and the inner annular wall, the outer annular wall, and the bottom wall enclose a mounting cavity for mounting the stator core, a plurality of second grooves are formed on the bottom wall of the motor housing, and each of the second grooves is distributed along a circumferential direction of the motor housing, so as to form the housing oil path channel;

the second groove extends from the inner annular wall of the motor housing to the outer annular wall of the motor housing so that the second groove communicates with the first oil passage and the second oil passage, respectively.

Optionally, in the above motor cooling structure, a first metal pressing plate is disposed in the winding groove, and the first metal pressing plate is located on a first side of the coil winding or a second side of the coil winding.

Optionally, in the above motor cooling structure, the first metal pressing plate is disposed on a first side of the coil winding, the first metal pressing plate is tightly attached to the coil winding, an oil groove channel is formed between the first metal pressing plate and a first side surface of the yoke portion, a first slot wedge is disposed on a second side of the coil winding, and the first slot wedge is used for fixing the coil winding.

Optionally, in the above motor cooling structure, the first metal pressing plate is disposed on a second side of the coil winding, and the first side of the coil winding is tightly attached to the first side of the yoke, and the oil groove channel is formed between the first metal pressing plate and the bead of the sealing plate.

Optionally, in the above motor cooling structure, the coil winding includes a bottom winding and a top winding, the bottom winding is tightly attached to the first side surface of the yoke, a second slot wedge is disposed between the top winding and the ribs of the sealing plate, the second slot wedge is used for fixing the top winding, and the oil groove channel is formed between the bottom winding and the top winding.

Optionally, in the above motor cooling structure, a second metal pressing plate is fixed to the bottom of the top layer winding and the top of the bottom layer winding, and the oil groove channel is located between the two second metal pressing plates.

Optionally, in the above motor cooling structure, the coil winding is fixed by means of paint dripping, paint dipping or glue pouring.

Optionally, in the above motor cooling structure, the coil winding is formed by winding round copper wires around the teeth, each round copper wire of the teeth is respectively and sequentially and tightly arranged along the axial direction and the radial direction of the teeth, and the round copper wires of the adjacent teeth are tightly attached, and an adhesive layer is arranged between each round copper wire.

Optionally, in the above motor cooling structure, a plurality of flow blocking pieces are uniformly distributed on the oil path along the circumferential direction, so that the cooling liquid flows along the directional direction.

According to the motor cooling structure, the oil inlet and the oil outlet are formed in the motor shell, the stator iron core is arranged in the motor shell, an oil path channel is formed between the stator iron core and the motor shell, and the oil inlet and the oil outlet are respectively communicated with the oil path channel. The coil winding group is sleeved on the tooth part of the stator core, so that the coil winding is positioned in a winding groove formed between adjacent tooth parts, an oil groove channel is arranged in the winding groove, the oil groove channel is positioned at the axial end part of the coil winding, the oil groove channel is communicated with the oil channel, so that cooling liquid enters the oil channel from the oil inlet of the motor shell and flows into the oil channel through the oil channel to cool the coil winding in the winding groove, and finally flows out from the oil outlet of the motor shell, thereby realizing the effect of heat dissipation of the coil winding. Meanwhile, a shell oil path channel communicated with the oil path channel can be formed in the motor shell, so that cooling liquid flows into the shell oil path channel from the oil path channel, the heat dissipation effect of the motor shell and the stator core is improved, and an iron core oil path channel communicated with the oil path channel can be formed in the stator core, so that cooling liquid flows into the iron core oil path channel from the oil path channel, the contact area of the cooling liquid and the stator core is increased, and the heat dissipation efficiency of the stator core is improved.

Compared with the prior art, the motor cooling structure provided by the invention has the advantages that the oil groove channel is arranged at the axial end part of the coil winding, an oil way formed between adjacent flat copper wires is not needed, the oil groove channel is positioned in the winding groove, the oil groove channel is communicated with the oil way channel, so that cooling liquid enters the oil way channel from the oil inlet of the motor shell and flows into the oil way channel through the oil way channel to cool the coil winding in the winding groove, and finally, the cooling liquid flows out from the oil outlet of the motor shell, thereby realizing the effect of heat dissipation of the coil winding. The oil groove channels are formed in the axial direction of the coil winding, so that the coil winding is not limited to flat copper wires, and the coil winding is also applicable to round copper wires, thereby realizing an oil cooling heat dissipation mode and improving the applicability of the oil cooling mode. Meanwhile, through setting up the shell oil circuit passageway on the motor shell and setting up the iron core oil circuit passageway on stator core, not only improved the radiating effect of motor oil cooling mode, can effectively reduce the pressure drop of coolant liquid oil inlet and oil-out on the motor shell moreover. In addition, when changing the coil turns, round copper line need not to adjust the specification like flat copper line, and motor coil cost of manufacture can not increase.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only embodiments of the present application, and other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a motor cooling structure according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a motor cooling structure according to a first embodiment of the present invention;

fig. 3 is a schematic structural diagram of an oil path in a tank according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of an oil path in a tank according to a second embodiment of the present invention;

fig. 5 is a schematic structural diagram of an oil path in a tank according to a third embodiment of the present invention;

fig. 6 is a schematic structural diagram of an oil path in a groove according to a fourth embodiment of the present invention;

fig. 7 is a schematic structural diagram of a stator core according to a first embodiment of the present invention;

fig. 8 is a schematic structural diagram of a motor housing according to a first embodiment of the present invention;

fig. 9 is a schematic diagram of arrangement of coil windings according to an embodiment of the present invention.

Wherein 100 is a motor shell, 101 is an oil inlet, 102 is an oil outlet, 103 is a sealing plate, 1031 is a convex rib, 104 is a motor rotating shaft, 105 is a shell oil path channel, 106 is an inner annular wall, 107 is an outer annular wall, and 108 is a bottom wall;

200 is a stator core, 201 is a tooth part, 202 is a winding groove, 2021 is a first metal pressing plate, 2022 is a first slot wedge, 2023 is a second slot wedge, 2024 is a second metal pressing plate, 203 is a yoke part, 2031 is a core oil path channel, 204 is an inner ring end surface, 2041 is a first oil path channel, 205 is an outer ring end surface, 2051 is a second oil path channel, and 206 is a flow blocking piece;

300 is a coil winding, 301 is an oil groove channel, 302 is a bottom winding, 303 is a top winding, 304 is a round copper wire, 305 is an adhesive layer.

Detailed Description

The core of the invention is to provide a self-locking type electric connection structure so as to improve the heat dissipation effect of a motor oil cooling mode.

Another core of the present invention is to provide a high voltage switchgear having the self-locking type electrical connection structure.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

As shown in fig. 1, an embodiment of the present invention discloses a motor cooling structure including a motor housing 100, a stator core 200, and a coil winding 300. It should be noted that in the prior art, most oil cooling schemes form oil ways in the grooves by means of adjacent flat copper wires, so that whether the whole oil way can normally circulate or not, and whether cooling liquid in each groove can be uniformly distributed depends on the manufacturing process of the flat wire to a great extent, meanwhile, the mode of forming the oil ways in the grooves by means of the adjacent copper wires cannot be applied to the scene of the round copper coil, and the applicability of the oil cooling mode is poor. And, the heat that stator core produced just forms the oil circuit through adjacent flat copper line in the inslot and dispels the heat and cool off, leads to stator core's radiating efficiency lower for the radiating effect of motor oil cooling method is limited, thereby influences the heat dissipation of whole motor, leads to the work efficiency of motor to reduce. In addition, when the number of turns of the coil is changed, the specification of the flat wire needs to be continuously adjusted, and the overall manufacturing cost of the motor is increased. According to the motor cooling structure disclosed by the embodiment of the invention, the oil groove channel 301 is arranged at the axial end part of the coil winding 300, an oil way formed between adjacent flat copper wires is not needed, the oil groove channel 301 is positioned in the winding groove 202, the oil groove channel 301 is communicated with the oil way channel, so that cooling liquid enters the oil way channel from the oil inlet 101 of the motor shell 100 and flows into the oil groove channel 301 through the oil way channel to cool the coil winding 300 in the winding groove 202, and finally flows out from the oil outlet 102 of the motor shell 100, thereby realizing the effect of heat dissipation of the coil winding 300. By forming the oil groove channel 301 in the axial direction of the coil winding 300, the coil winding 300 is not limited to flat copper wires, and is also applicable to round copper wires, thereby realizing an oil cooling heat dissipation mode and improving the applicability of the oil cooling mode. Meanwhile, by arranging the shell oil passage 105 on the motor shell 100 and the iron core oil passage 2031 on the stator iron core 200, the heat dissipation effect of the motor oil cooling mode is improved, and the pressure drop of the cooling liquid on the oil inlet 101 and the oil outlet 102 of the motor shell 100 can be effectively reduced. In addition, when changing the coil turns, round copper line need not to adjust the specification like flat copper line, and motor coil cost of manufacture can not increase.

As shown in fig. 1 and 2, an oil inlet 101 and an oil outlet 102 are respectively disposed on the motor housing 100, so that cooling liquid enters the motor housing 100 from the oil inlet 101 and flows out from the oil outlet 102, thereby cooling the stator core 200 and the coil winding 300 in the motor housing 100. In this application, cooling oil is used as the cooling liquid to realize an oil-cooled cooling mode unless otherwise specified.

As shown in fig. 1 and 2, the stator core 200 is disposed in the motor housing 100, and an oil path is formed between the stator core 200 and the motor housing 100, and the oil inlet 101 and the oil outlet 102 are respectively communicated with the oil path. Meanwhile, the stator core 200 includes tooth portions 201, and winding slots 202 are formed between adjacent tooth portions 201. The coil winding 300 is sleeved on the tooth 201, so that the coil winding 300 is positioned in the wire winding groove 202. Meanwhile, as shown in fig. 2, an oil groove passage 301 is provided in the winding groove 202, and the oil groove passage 301 is located at an axial end of the coil winding 300, that is, an end face of the coil winding 300 in the axial direction, wherein the oil groove passage 301 communicates with an oil passage so that the cooling liquid flows into the oil groove passage 301 through the oil passage to cool and dissipate heat of the coil winding 300. When the cooling liquid enters the oil channel from the oil inlet 101 of the motor housing 100 and flows into the oil channel 301 through the oil channel to cool the coil winding 300 in the winding groove 202, and finally flows out from the oil outlet 102 of the motor housing 100, thereby realizing the heat dissipation effect of the coil winding 300. By forming the oil groove channel 301 in the axial direction of the coil winding 300, the coil winding 300 is not limited to flat copper wires, and is also applicable to round copper wires, thereby realizing an oil cooling heat dissipation mode and improving the applicability of the oil cooling mode. In addition, when changing the coil turns, round copper line need not to adjust the specification like flat copper line, and motor coil cost of manufacture can not increase.

Meanwhile, as shown in fig. 7 and 8, a casing oil path channel 105 communicated with the oil path channel is provided on the motor casing 100, so that the cooling liquid flows into the casing oil path channel 105 from the oil path channel, thereby improving the heat dissipation effect of the motor casing 100 and the stator core 200, and an iron core oil path channel 2031 communicated with the oil path channel is provided on the stator core 200, so that the cooling liquid flows into the iron core oil path channel 2031 from the oil path channel, increasing the contact area between the cooling liquid and the stator core 200, and improving the heat dissipation efficiency of the stator core 200. Of course, the case oil passage 105 may be provided in the motor case 100, and the core oil passage 2031 may be provided in the stator core 200, so that the contact area between the coolant and the stator core 200 may be increased. By providing the housing oil passage 105 on the motor housing 100 and the core oil passage 2031 on the stator core 200, not only is the heat dissipation effect of the motor oil cooling mode improved, but also the pressure drop of the cooling liquid in the oil inlet 101 and the oil outlet 102 on the motor housing 100 can be effectively reduced.

Further, as shown in fig. 1 and 7, the stator core 200 includes a yoke 203, and the yoke 203 has two sides disposed opposite to each other, and for convenience of understanding, the two sides of the yoke 203 are defined as a first side and a second side, respectively, wherein the tooth 201 of the stator core 200 is connected to the first side of the yoke 203, the second side of the yoke 203 is closely attached to the motor housing 100, and the core oil passage 2031 is disposed on the second side of the yoke 203. Further, the coil winding 300 has oppositely disposed first and second sides, wherein the first side of the coil winding 300 is proximate to the first side of the yoke 203 and the second side of the coil winding 300 is distal to the yoke 203 of the stator core 200. Meanwhile, as shown in fig. 1 and 8, the motor housing 100 includes a bottom wall 108 that abuts against the second side face of the yoke 203, and the housing oil passage 105 is provided on the bottom wall 108 of the motor housing 100. A sealing plate 103 is disposed in the motor housing 100, the sealing plate 103 is located at the second side of the coil winding 300, the sealing plate 103 is uniformly provided with a plurality of ribs 1031 along the circumferential direction, and the ribs 1031 correspond to the winding grooves 202. Specifically, the sealing plate 103 has a first side and a second side disposed opposite to each other, and the bead 1031 is disposed on the first side of the sealing plate 103 to improve the rigidity of the sealing plate 103. Meanwhile, the second side surface of the sealing plate 103 is a surface in contact with an air gap, the air gap is a gap between the stator and the rotor, the second side surface of the sealing plate 103 is a smooth plane, friction coefficient is reduced, loss caused by friction with air when the rotor rotates can be effectively reduced, temperature rise of magnetic steel is further reduced, and motor efficiency is improved.

Further, as can be seen from fig. 1, 2 and 8, the motor housing 100 includes an inner annular wall 106 and an outer annular wall 107 disposed opposite to each other, and the inner annular wall 106, the outer annular wall 107 and the bottom wall 108 enclose a mounting cavity for mounting the stator core 200. The stator core 200 has an inner ring end surface 204 and an outer ring end surface 205 disposed opposite to each other, wherein the inner ring end surface 204 is an end surface close to the motor shaft 104, the outer ring end surface 205 is an end surface far away from the motor shaft 104, and the stator core 200 is sleeved outside the inner ring wall 106 of the motor housing 100, so that the inner ring wall 106 of the motor housing 100 is located inside the inner ring end surface 204 of the stator core 200, and the outer ring wall 107 of the motor housing 100 is located outside the outer ring end surface 205 of the stator core 200. The oil passage includes a first oil passage 2041 and a second oil passage 2051, the first oil passage 2041 is provided on the inner ring end face 204 side of the stator core 200, i.e., between the inner ring end face 204 of the stator core 200 and the inner ring wall 106 of the motor housing 100, the second oil passage 2051 is provided on the outer ring end face 205 side of the stator core 200, i.e., between the outer ring end face 205 of the stator core 200 and the outer ring wall 107 of the motor housing 100, and the oil groove passage 301 communicates with the first oil passage 2041 and the second oil passage 2051, respectively, and the oil inlet 101 and the oil outlet 102 communicate with the second oil passage 2051, respectively.

Further, as shown in fig. 7, in a specific embodiment, a plurality of first grooves are formed on the second side surface of the yoke 203, and each of the first grooves is distributed along the circumferential direction of the stator core 200 to form a core oil passage 2031. Specifically, the first groove is a strip groove, and the first groove extends from the inner ring end surface 204 of the stator core 200 to the outer ring end surface 205 of the stator core 200, so that the first groove is respectively communicated with the first oil path 2041 and the second oil path 2051, thereby ensuring that the cooling liquid can circulate among the first oil path 2041, the core oil path 2031 and the second oil path 2051, increasing the contact area between the cooling liquid and the stator core 200, improving the heat dissipation efficiency of the stator core 200, and simultaneously effectively reducing the pressure drop of the cooling liquid at the oil inlet 101 and the oil outlet 102 on the motor housing 100. Of course, the first groove is not limited to the elongated groove, but may be an annular groove radially distributed along the stator core 200, and each annular groove is mutually communicated through the elongated groove, so as to increase the contact area between the cooling liquid and the stator core 200, and improve the heat dissipation effect of the motor oil cooling mode.

Further, as shown in fig. 8, in a specific embodiment, a plurality of second grooves are formed on the bottom wall 108 of the motor housing 100, and each of the second grooves is distributed along the circumferential direction of the motor housing 100 to form the housing oil passage 105. Specifically, the second groove is a strip groove, and the second groove extends from the inner annular wall 106 of the motor housing 100 to the outer annular wall 107 of the motor housing 100, so that the second groove is respectively communicated with the first oil path 2041 and the second oil path 2051, thereby ensuring that the cooling liquid can circulate among the first oil path 2041, the housing oil path 105 and the second oil path 2051, increasing the contact area of the cooling liquid with the motor housing 100 and the stator core 200, improving the heat dissipation efficiency of the stator core 200, and simultaneously effectively reducing the pressure drop of the cooling liquid at the oil inlet 101 and the oil outlet 102 on the motor housing 100. Of course, the second grooves are not limited to the elongated grooves, but may be annular grooves distributed along the radial direction of the motor housing 100, and the annular grooves are mutually communicated through the elongated grooves, so that the contact area of the cooling liquid with the motor housing 100 and the stator core 200 is increased, and the heat dissipation effect of the motor oil cooling mode is improved.

In addition, as shown in fig. 2, in order to ensure that the coolant can flow in a directional manner, a plurality of flow blocking pieces 206 are arranged on the oil path, and sockets are arranged on the flow blocking pieces 206, so that the flow blocking pieces 206 are inserted into the convex parts of the convex teeth 201 of the coil winding 300 through the sockets, thereby enabling the flow blocking pieces 206 to be better matched with the coil winding 300, and meanwhile, the flow blocking pieces 206 are fixed through glue injection. Specifically, for ease of understanding, the flow blocking piece 206 provided to the first oil passage 2041 is defined as a first flow blocking piece, and the flow blocking piece 206 provided to the second oil passage 2051 is defined as a second flow blocking piece. Meanwhile, the tooth 201 of the stator core 200 has a proximal end and a distal end which are oppositely disposed, the proximal end of the tooth 201 is one end close to the motor shaft 104, the distal end of the tooth 201 is one end far away from the motor shaft 104, and the first choke is inserted into the protruding portion of the coil winding 300 protruding from the proximal end of the tooth 201 through the insertion opening, so as to block the cooling liquid from flowing along the first oil path 2041, thereby ensuring that the cooling liquid flows from the first oil path 2041 to the oil path 301, and flows from the oil path 301 to the second oil path 2051, and further realizing the directional flowing effect that the cooling liquid flows from the first oil path 2041 to the second oil path 2051 through the oil path 301. Similarly, the second flow blocking member is inserted into the protruding portion of the distal end of the protruding tooth portion 201 of the coil winding 300 through the insertion opening, so as to block the coolant flowing along the second oil path channel 2051, thereby ensuring that the coolant flows from the second oil path channel 2051 to the oil groove channel 301 and flows from the oil groove channel 301 to the first oil path channel 2041, and further realizing the directional flow effect that the coolant flows from the second oil path channel 2051 to the first oil path channel 2041 through the oil groove channel 301. The arrow direction in fig. 2 is the flow direction of the coolant.

In a specific embodiment, as shown in fig. 2, the number of first chokes is 3, the number of second chokes is 4, and in order to ensure that the cooling liquid can be uniformly distributed in the oil groove channels 301, the normal circulation of the whole oil cooling circulation loop is ensured, the first chokes and the second chokes are alternately arranged along the circumferential direction, that is, one first chokes or one second chokes are arranged every 3 oil groove channels 301, so that the three-in three-out alternating circulation of the cooling liquid is realized, and finally, the cooling liquid flows out from the oil outlet 102 on the motor housing 100. Of course, the number of the first spoilers and the second spoilers is not limited to the above embodiments, and is not limited to the arrangement manner in the above embodiments, for example, the number of the first spoilers is 4, the number of the second spoilers is 3, and the like, and the specific implementation is similar to the above embodiments, and will not be repeated herein. Note that, in the above-described embodiment, the triple intake of the cooling liquid means that the cooling liquid enters the first oil passage 2041 from the second oil passage 2051 through the adjacent three oil groove passages 301; the third outflow of the coolant refers to the outflow of the coolant from the first oil passage 2041 to the second oil passage 2051 through the adjacent three oil groove passages 301.

It should be noted that, the flow blocking piece 206 not only can block the flow of the cooling liquid along the oil path channel, and ensure that the cooling liquid circulates between the oil groove channel 301 and the oil path channel according to the predetermined direction, but also can ensure that the cooling liquid circulates between the oil path channel and the core oil path channel 2031 and the housing oil path channel 105 according to the predetermined direction, so that a cooling circulation loop with an inlet and an outlet is formed between the motor housing 100 and the stator core 200, and is finally discharged from the oil outlet 102 on the motor housing 100, so as to realize the cooling and heat dissipation effects of the motor housing 100 and the stator core 200.

According to the motor cooling structure disclosed by the embodiment of the invention, the oil inlet 101 and the oil outlet 102 are arranged on the motor shell 100, the stator core 200 is arranged in the motor shell 100, an oil path channel is formed between the stator core and the motor shell 100, and the oil inlet 101 and the oil outlet 102 are respectively communicated with the oil path channel. Meanwhile, the coil winding 300 is sleeved on the tooth 201 of the stator core 200, so that the coil winding 300 is located in the winding groove 202 formed between adjacent teeth 201, an oil groove channel 301 is arranged in the winding groove 202, the oil groove channel 301 is located at the axial end position of the coil winding 300, the oil groove channel 301 is communicated with an oil path channel, so that cooling liquid enters the oil path channel from the oil inlet 101 of the motor housing 100 and flows into the oil groove channel 301 through the oil path channel to cool the coil winding 300 in the winding groove 202, and finally flows out from the oil outlet 102 of the motor housing 100, thereby realizing the effect of heat dissipation of the coil winding 300. Meanwhile, a casing oil path channel 105 communicated with the oil path channel can be arranged on the motor casing 100, so that cooling liquid flows into the casing oil path channel 105 from the oil path channel, the heat dissipation effect of the motor casing 100 and the stator core 200 is improved, and an iron core oil path channel 2031 communicated with the oil path channel can also be arranged on the stator core 200, so that the cooling liquid flows into the iron core oil path channel 2031 from the oil path channel, the contact area between the cooling liquid and the stator core 200 is increased, and the heat dissipation efficiency of the stator core 200 is improved.

Compared with the prior art, in the motor cooling structure disclosed by the embodiment of the invention, the oil groove channel 301 is arranged at the axial end position of the coil winding 300, an oil way formed between adjacent flat copper wires is not needed, the oil groove channel 301 is positioned in the winding groove 202, the oil groove channel 301 is communicated with the oil way channel, so that cooling liquid enters the oil way channel from the oil inlet 101 of the motor housing 100 and flows into the oil groove channel 301 through the oil way channel to cool the coil winding 300 in the winding groove 202, and finally flows out from the oil outlet 102 of the motor housing 100, thereby realizing the effect of heat dissipation of the coil winding 300. By forming the oil groove channel 301 in the axial direction of the coil winding 300, the coil winding 300 is not limited to flat copper wires, and is also applicable to round copper wires, thereby realizing an oil cooling heat dissipation mode and improving the applicability of the oil cooling mode. Meanwhile, by arranging the shell oil passage 105 on the motor shell 100 and the iron core oil passage 2031 on the stator iron core 200, the heat dissipation effect of the motor oil cooling mode is improved, and the pressure drop of the cooling liquid on the oil inlet 101 and the oil outlet 102 of the motor shell 100 can be effectively reduced. In addition, when changing the coil turns, round copper line need not to adjust the specification like flat copper line, and motor coil cost of manufacture can not increase.

Further, as shown in fig. 3 and 4, in a specific embodiment, a first metal platen 2021 is disposed in the wire winding slot 202, and the first metal platen 2021 is located on a first side of the coil winding 300 or a second side of the coil winding 300. Specifically, as shown in fig. 3, the coil winding 300 is first sleeved on the tooth 201 of the stator core 200, and the first side of the coil winding 300 is made to be close to the first side surface of the yoke 203 of the stator core 200, and meanwhile, the first metal pressing plate 2021 is pressed into the second side of the coil winding 300, so that an oil groove channel 301 is formed between the first metal pressing plate 2021 and the ribs 1031 of the sealing plate 103, and thus, the cooling liquid flows into the oil groove channel 301 to dissipate heat of the coil winding 300. By disposing the first metal pressure plate 2021 on the second side of the coil winding 300, it can function as a slot wedge, fix the coil winding 300 in the wire slot 202, and transfer the heat generated by the coil winding 300 to the cooling liquid in the oil slot channel 301 better, thereby improving the heat dissipation efficiency.

Of course, as shown in fig. 4, the first metal pressing plate 2021 may be disposed on the first side of the coil winding 300, and the first metal pressing plate 2021 is closely attached to the coil winding 300, so as to form the oil groove channel 301 between the first metal pressing plate 2021 and the first side surface of the yoke 203 of the stator core 200. In order to fix the coil winding 300, a first slot wedge 2022 is disposed on the second side of the coil winding 300, and a certain gap exists between the first slot wedge 2022 and the ribs 1031 of the sealing plate 103, so that the force applied to the coil winding 300 during the operation of the motor is prevented from being transmitted to the sealing plate 103 through the first slot wedge 2022, and the sealing effect is further reduced. By disposing the first metal pressure plate 2021 on the first side of the coil winding 300, the eddy current loss of the first metal pressure plate 2021 can be reduced, and at the same time, the contact area between the coolant and the stator core 200 can be increased, so that the heat dissipation effect of the motor can be improved.

In another embodiment, as shown in fig. 5, coil winding 300 includes a bottom layer winding 302 and a top layer winding 303. The bottom winding 302 is tightly attached to the first side surface of the yoke 203 of the stator core 200, a second slot wedge 2023 is disposed between the top winding 303 and the rib 1031 of the sealing plate 103 to fix the top winding 303, and a certain gap exists between the second slot wedge 2023 and the rib 1031 of the sealing plate 103, so that the force applied to the coil winding 300 is prevented from being transmitted to the sealing plate 103 through the second slot wedge 2023 during the operation of the motor, thereby reducing the sealing effect. Meanwhile, an oil groove channel 301 is formed between the bottom layer winding 302 and the top layer winding 303. In this embodiment, the bottom winding 302 and the top winding 303 may be fixed by means of paint dropping, paint dipping or glue pouring. By forming the oil groove channel 301 between the bottom winding 302 and the top winding 303, the cooling liquid directly contacts the coil winding 300, so that the heat dissipation effect is optimal, the full rate of the motor groove is improved, but the fixing process of the coil winding 300 is relatively complex.

Further, as shown in fig. 9, the coil winding 300 employs a round copper wire 304, and the coil winding 300 is formed by winding the teeth 201 with the round copper wire 304. Specifically, the round copper wires 304 of each tooth 201 are closely arranged in order along the axial direction and the radial direction of the tooth 201, respectively, and the round copper wires 304 of adjacent teeth 201 are closely attached. In this embodiment, as shown in fig. 9, the number of round copper wires 304 in the same winding slot 202 in the transverse direction (view of fig. 9), that is, the number along the radial direction of the tooth 201 is 10, the number in the longitudinal direction (view of fig. 9), that is, the number along the axial direction of the tooth 201 is 12, and when the oil groove channel 301 is disposed between the bottom layer winding 302 and the top layer winding 303, the number of the bottom layer winding 302 and the top layer winding 303 in the longitudinal direction (view of fig. 9) may be 6, respectively, so as to fully utilize the space in the winding slot 202, thereby improving the slot filling rate of the motor. Meanwhile, as shown in fig. 9, an adhesive layer 305 is provided between each round copper wire 304. In this embodiment, an adhesive layer 305 is formed between the round copper wires 304 by a potting process, so that the round copper wires 304 are adhered and fixed to each other.

Of course, as shown in fig. 6, in order to reduce difficulty in the fixing process of the coil winding 300, second metal pressing plates 2024 are respectively fixed to the bottom of the top layer winding 303 and the top of the bottom layer winding 302, so that an oil groove channel 301 is formed between the two second metal pressing plates 2024. By arranging the two second metal pressing plates 2024, and enabling the oil groove channel 301 to be located in the middle area of the coil winding 300, the coil winding 300 is divided into a bottom layer winding 302 and a top layer winding 303, and the heat dissipation effect of the motor is improved while the fixing difficulty of the coil winding 300 is reduced.

The terms first and second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements but may include steps or elements not expressly listed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (13)

1. A motor cooling structure, characterized by comprising:

the motor comprises a motor shell (100), wherein an oil inlet (101) and an oil outlet (102) are respectively arranged on the motor shell (100);

the stator core (200) is arranged in the motor shell (100), an oil path channel is formed between the stator core (200) and the motor shell (100), the oil inlet (101) and the oil outlet (102) are respectively communicated with the oil path channel, the stator core (200) comprises tooth parts (201), and a wire winding groove (202) is formed between every two adjacent tooth parts (201);

a shell oil channel (105) communicated with the oil channel is arranged on the motor shell (100), and/or an iron core oil channel (2031) communicated with the oil channel is arranged on the stator iron core (200);

the coil winding (300), coil winding (300) cover is located on tooth portion (201), so that coil winding (300) are located in wire winding groove (202), be provided with oil groove passageway (301) in wire winding groove (202), just oil groove passageway (301) are located coil winding (300)'s axial end, oil groove passageway (301) with the oil circuit passageway intercommunication is in order to make the coolant liquid pass through the oil circuit passageway flows into in oil groove passageway (301) for coil winding (300) cooling heat dissipation.

2. The motor cooling structure according to claim 1, wherein the stator core (200) includes a yoke (203), the yoke (203) having a first side and a second side disposed opposite to each other, the tooth (201) being connected to the first side of the yoke (203), the second side of the yoke (203) being in close proximity to the motor housing (100), the coil winding (300) having a first side and a second side disposed opposite to each other, the first side of the coil winding (300) being adjacent to the first side of the yoke (203), the core oil passage (2031) being disposed in the second side of the yoke (203);

the motor housing (100) comprises a bottom wall (108) tightly attached to the second side face of the yoke portion (203), the housing oil path channel (105) is arranged on the bottom wall (108) of the motor housing (100), a sealing plate (103) is arranged in the motor housing (100), the sealing plate (103) is located on the second side of the coil winding (300), a plurality of ribs (1031) are uniformly arranged on the sealing plate (103) along the circumferential direction, and the ribs (1031) correspond to the winding grooves (202).

3. The motor cooling structure according to claim 2, characterized in that the stator core (200) has an inner ring end face (204) and an outer ring end face (205), the inner ring end face (204) is an end face close to a motor rotation shaft (104), the outer ring end face (205) is an end face away from the motor rotation shaft (104), the oil passage includes a first oil passage (2041) and a second oil passage (2051), the first oil passage (2041) is provided on the inner ring end face (204) side of the stator core (200), the second oil passage (2051) is provided on the outer ring end face (205) side of the stator core (200), and the oil groove passage (301) is respectively communicated with the first oil passage (2041) and the second oil passage (2051), and the oil inlet (101) and the oil outlet (102) are respectively communicated with the second oil passage (2051).

4. A motor cooling structure according to claim 3, wherein a plurality of first grooves are provided on the second side surface of the yoke (203), and each of the first grooves is distributed along the circumferential direction of the stator core (200) to form the core oil passage (2031);

the first groove extends from an inner ring end surface (204) of the stator core (200) to an outer ring end surface (205) of the stator core (200) such that the first groove communicates with the first oil passage (2041) and the second oil passage (2051), respectively.

5. A motor cooling structure according to claim 3, wherein the motor housing (100) includes an inner annular wall (106) and an outer annular wall (107) which are disposed opposite to each other, and the inner annular wall (106), the outer annular wall (107) and the bottom wall (108) are surrounded to form a mounting cavity for mounting the stator core (200), a plurality of second grooves are formed in the bottom wall (108) of the motor housing (100), and each of the second grooves is distributed along the circumferential direction of the motor housing (100) to form the housing oil passage (105);

the second groove extends from an inner annular wall (106) of the motor housing (100) to an outer annular wall (107) of the motor housing (100) such that the second groove communicates with the first oil passage (2041) and the second oil passage (2051), respectively.

6. The motor cooling structure according to claim 2, characterized in that a first metal pressing plate (2021) is provided in the winding groove (202), the first metal pressing plate (2021) being located on a first side of the coil winding (300) or a second side of the coil winding (300).

7. The motor cooling structure according to claim 6, characterized in that the first metal pressing plate (2021) is disposed on a first side of the coil winding (300), the first metal pressing plate (2021) is tightly attached to the coil winding (300), the oil groove channel (301) is formed between the first metal pressing plate (2021) and a first side surface of the yoke (203), and a first slot wedge (2022) is disposed on a second side of the coil winding (300), and the first slot wedge (2022) is used for fixing the coil winding (300).

8. The motor cooling structure according to claim 6, wherein the first metal pressure plate (2021) is disposed on the second side of the coil winding (300), and the first side of the coil winding (300) is abutted against the first side surface of the yoke (203), and the oil groove channel (301) is formed between the first metal pressure plate (2021) and the bead (1031) of the sealing plate (103).

9. The motor cooling structure according to claim 2, characterized in that the coil winding (300) includes a bottom winding (302) and a top winding (303), the bottom winding (302) is tightly attached to the first side surface of the yoke (203), a second slot wedge (2023) is provided between the top winding (303) and a bead (1031) of the sealing plate (103), the second slot wedge (2023) is used for fixing the top winding (303), and the oil groove channel (301) is formed between the bottom winding (302) and the top winding (303).

10. The motor cooling structure according to claim 9, characterized in that a second metal presser plate (2024) is fixed to the bottom of the top layer winding (303) and the top of the bottom layer winding (302), respectively, and the oil groove channel (301) is located between the two second metal presser plates (2024).

11. The motor cooling structure according to claim 9, characterized in that the coil winding (300) is fixed by means of paint dripping, paint dipping or glue pouring.

12. The motor cooling structure according to claim 1, wherein the coil winding (300) is formed by winding round copper wires (304) around the teeth (201), the round copper wires (304) of each tooth (201) are closely arranged in sequence in the axial direction and the radial direction of the teeth (201), respectively, and the round copper wires (304) of adjacent teeth (201) are closely attached, and an adhesive layer (305) is provided between each round copper wire (304).

13. The motor cooling structure according to any one of claims 1 to 12, characterized in that a plurality of flow blocking pieces (206) are uniformly distributed on the oil passage in the circumferential direction so that the cooling liquid flows in a directional direction.