CN206237253U - Motor direct cooling structure - Google Patents

Abstract

The utility model belongs to generator and motor field specifically provide a direct cooling structure of motor. The utility model discloses aim at solving the unable problem to the direct cooling of rotor core of current oil-cooled motor. The utility model discloses a direct cold structure of motor includes casing and end cover, and casing and end cover are formed with the cavity, are provided with the pivot in the cavity, surround the rotor that is fixed in the pivot, surround in the stator of rotor and coil the stator winding on the stator. The rotating shaft is provided with a first cooling channel, the inner side of the shell is provided with a second cooling channel, and the end cover is provided with a connecting channel. The first cooling channel is communicated with the second cooling channel in the cavity, and the first cooling channel and the second cooling channel are respectively communicated with the connecting channel. Through communicate first cooling channel and second cooling channel and connecting channel respectively in the cavity, can realize the direct cooling of coolant liquid countershaft and rotor core, improved the cooling effect of motor greatly.

Description

Motor direct cooling structure

technical field

The utility model belongs to the field of generators and motors, and specifically provides a motor direct cooling structure.

Background technique

Motors have a wide range of applications. Especially in recent years, as my country promotes the transformation and upgrading of the manufacturing industry, in various intelligent manufacturing fields, automation equipment powered by motors and driven by motors is becoming more and more automated. Under this trend, equipment in various industries has higher and higher requirements for motors. However, during the long-term operation of the motor, the temperature rise problem often restricts the efficient operation of the motor and further reduces the service life of the motor.

In order to make the motor run stably, it is necessary to cool down the motor while the motor is running. At present, there are natural cooling, air cooling, liquid cooling and other means of cooling the motor. In contrast, liquid cooling has the best cooling effect. Liquid cooling is divided into water cooling and oil cooling. The water-cooled motor cannot touch water because the stator is charged, so cooling channels can only be installed in the middle or outside of the casing. Since the cooling water in the cooling channel cannot directly contact the stator, and cannot Cooling the high-temperature rotor located inside the casing results in poor cooling effect of the water-cooled motor. The oil-cooled motor has a better cooling effect than the water-cooled motor because the cooling oil can directly contact the stator and the rotor. However, at present, the oil-cooled motor can only cool the outer surfaces of the stator and the rotor, and cannot directly cool the inside of the rotor.

Correspondingly, a new motor direct cooling structure is needed in the field to solve the above problems.

Utility model content

In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that the oil-cooled motor cannot directly cool the interior of the rotor, the utility model provides a direct cooling structure of the motor, wherein the motor includes a casing and an end cover, and the casing A cavity is formed with the end cover, and the cavity is provided with a rotating shaft, a rotor fixed around the rotating shaft, a stator surrounding the rotor, and a stator winding coiled on the stator. The rotating shaft is provided with a first cooling channel, the inner side of the casing is provided with a second cooling channel, and the end cover is provided with a connecting channel. The first cooling channel is communicated with the second cooling channel in the cavity, the first cooling channel and the second cooling channel are respectively communicated with the connecting channel, and the second cooling channel is communicated with Inject coolant to cool the inside of the motor.

In a preferred technical solution of the direct cooling structure of the motor above, the first cooling channel includes a shaft inner hole arranged axially inside the shaft and a shaft through hole group extending radially outward of the shaft inner hole. The inner hole of the rotating shaft communicates with the second cooling passage through the through hole group of the rotating shaft in the cavity, and the inner hole of the rotating shaft directly communicates with the connecting passage.

In the preferred technical solution of the direct cooling structure of the above-mentioned motor, the through-hole group of the rotating shaft includes several through-hole unit groups of the rotating shaft axially arranged on the rotating shaft. Each rotating shaft through hole in is located in the same plane.

In the preferred technical solution of the direct cooling structure of the above-mentioned motor, a radially surrounding spiral groove is provided along the inner wall of the casing, wherein a part of the spiral groove and the outer wall of the stator form the spiral structure. The second cooling channel, the other part of the spiral groove communicates with the first cooling channel and the connecting channel in the cavity respectively.

In the preferred technical solution of the direct cooling structure of the above-mentioned motor, the connecting channel includes a countersunk hole arranged in the middle of the end cover and several end cover through holes extending radially outward of the countersunk hole, and the countersunk head The hole communicates with the inner hole of the rotating shaft, and the end cover through hole communicates the counterbore in the cavity with the second cooling channel.

In the preferred technical solution of the direct cooling structure of the motor above, the direct cooling structure of the motor also includes a liquid outlet channel arranged at the bottom of the casing, and the liquid outlet channel includes a channel inner hole arranged in the axial direction of the casing And a liquid outlet through hole arranged radially in the liquid outlet channel, the inner hole of the channel passes through the liquid outlet through hole in the cavity and the first cooling channel, the second cooling channel and the The connecting channels are respectively connected. Viewed along the flow direction of the cooling liquid, a liquid outlet nozzle is arranged at the downstream end of the liquid outlet channel.

In the preferred technical solution of the direct cooling structure of the above-mentioned motor, the liquid outlet channel includes a channel inner hole and two liquid outlet through holes radially arranged in the liquid outlet channel, and the two liquid outlet through holes are respectively set Inside the end caps on both sides of the housing.

In the preferred technical solution of the above motor direct cooling structure, the end cover is provided with a liquid outlet corresponding to the downstream end of the liquid outlet channel, and the liquid outlet is connected to the liquid outlet nozzle.

In the preferred technical solution of the direct cooling structure of the motor above, a liquid inlet is provided on the casing, a liquid inlet is provided on the liquid inlet, and the liquid inlet is communicated with the second cooling passage, so The cooling liquid forms at least one cooling path in the second cooling channel through the liquid inlet nozzle.

In the preferred technical solution of the direct cooling structure of the motor above, the casing and the end cover on one side are of an integrated structure, and the connecting channel is arranged on the inside of the end cover on the one side; and/or the motor is an electric motor The drive motor of the car.

Those skilled in the art can understand that, in the preferred technical solution of the present utility model, the rotating shaft has a first cooling passage, the inside of the casing is provided with a second cooling passage, the end cover is provided with a connecting passage and the bottom of the casing is provided with a liquid outlet aisle. Wherein the first cooling channel communicates with the second cooling channel in the cavity, the first cooling channel and the second cooling channel communicate with the connecting channel, and the first cooling channel, the second cooling channel and the connecting channel all communicate with the liquid outlet channel in the cavity connected. The setting of the direct cooling structure of the above-mentioned motor enables the coolant to cool the stator through the second cooling channel, then flow through the first cooling channel to cool the rotating shaft and rotor, and then flow through the connecting channel and the liquid outlet channel to discharge the heat from the motor , solves the problem that the direct cooling motor cannot directly cool the rotor core, greatly improves the cooling effect, and is especially suitable for applications such as electric vehicles that require high motor performance.

Description of drawings

Fig. 1 is the structural representation (front view direction, section view) of the motor direct cooling structure of the present utility model;

Fig. 2 is a schematic cross-sectional view along the A-A direction of Fig. 1;

Fig. 3 is a schematic cross-sectional view along B-B direction of Fig. 1 .

detailed description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the utility model, and are not intended to limit the protection scope of the utility model. For example, although the description is described in conjunction with cooling oil, the utility model can obviously adopt other various forms of cooling liquid, as long as the cooling liquid itself is electrically insulating and does not cause corrosion to motor parts such as stator windings. Can.

It should be noted that, in the description of the present utility model, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be configured in a specific orientation, and operation, and therefore cannot be construed as a limitation of the utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present utility model, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, or It can be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

Taking a motor applied to an electric vehicle as an example, the motor liquid cooling structure of the present invention will be described with reference to the accompanying drawings. As shown in Figure 1, in the motor direct cooling structure of the present utility model, the motor mainly includes a rotating shaft 100, a casing 200 and end covers 300 arranged on both sides of the casing 200, and the casing 200 and the end covers 300 on both sides are formed with cavity. The rotating shaft 100 is disposed in the cavity and connected with the end cover 300 through a bearing. In addition, the motor further includes a rotor 13 fixed around the shaft 100 , a stator 14 around the rotor 13 , and a stator winding 15 coiled on the stator 14 . A first cooling passage 11 is provided on the rotating shaft 100 , a second cooling passage 21 is provided inside the casing 200 , and a connecting passage 31 is provided on the end cover 300 . Wherein, the first cooling channel 11 communicates with the second cooling channel 21 in the cavity, and the first cooling channel 11 and the second cooling channel 21 communicate with the connecting channel 31 respectively.

As shown in FIGS. 1 and 2 , the first cooling channel 11 mainly includes a shaft inner hole 111 axially disposed inside the shaft 100 , and a plurality of cooling shafts extending from the shaft inner hole 111 radially outward and disposed on the shaft 100 . A rotating shaft through hole group composed of a rotating shaft through hole 112. Wherein, the inner hole 111 of the rotating shaft may communicate with the second cooling channel 21 through the through hole 112 of the rotating shaft in the cavity, and the inner hole 111 of the rotating shaft directly communicates with the connecting channel 31 . Further, the rotating shaft through hole group of the present invention can be divided into a plurality of rotating shaft through hole unit groups distributed along the axial direction according to its arrangement form, wherein each rotating shaft through hole unit group includes a plurality of rotating shaft through hole units distributed along the circumferential direction 112, and viewed along the radial direction, the through holes 112 of the rotating shafts are roughly located in the same plane.

Further referring to FIG. 2 , the first cooling channel 11 of the present invention may include 8 sets of shaft through-hole unit groups evenly arranged on the shaft 100, and each group of shaft through-hole unit groups may include 4 roughly arranged in a "cross" shape. The rotating shaft through hole 112, and the rotating shaft inner hole 111 can communicate with the second cooling channel 21 through the two sets of rotating shaft through hole unit groups in the cavity, that is, the eight rotating shaft through holes 112 arranged near the end covers 300 on both sides . The other rotating shaft through holes 112 can connect the rotating shaft inner hole 111 with the inner wall of the rotor 13 . Those skilled in the art can imagine that the number and arrangement of the rotating shaft through holes 112 are not static, and those skilled in the art can make corresponding adjustments according to the specific use conditions and use environment.

Continuing to refer to FIG. 1 , the second cooling channel 21 mainly includes a radially surrounding spiral groove 211 disposed on the inner wall of the casing 200 . Wherein, the spiral groove 211 and the outer wall of the stator 14 can form a second cooling passage 21 with a spiral structure, and the second cooling passage 21 can communicate with the first cooling passage 11 and the connecting passage 31 respectively in the cavity, and communicate with the first cooling passage 11 and the connecting passage 31 through the connecting passage 31. The first cooling channel 11 communicates. According to the orientation in Fig. 1, the part of the spiral groove 211 located in the middle of the casing 200 and the outer wall of the stator 14 form a second cooling channel 21 with a spiral structure, and the parts of the spiral groove 211 located at both ends of the casing 200 are connected with the first cooling channel 11 in the cavity. The rotating shaft through holes 112 located at both ends are in communication, and the part at the right end of the spiral groove 211 can communicate with the rotating shaft inner hole 111 of the first cooling channel 11 through the connecting channel 31 .

As shown in FIG. 1 and FIG. 3 , the connection channel 31 may include a counterbore 311 disposed at the center of the end cap 300 and several end cap through holes 312 extending radially outside the counterbore 311 . Wherein, the counterbore 311 directly communicates with the inner hole 111 of the rotating shaft, and several end cap through holes 312 communicate with the second cooling channel 21 in the cavity. Referring to FIG. 3 , preferably, the connecting channel 31 includes 8 end cap through holes 312 extending radially outside the counterbore 311 , and the 8 end cap through holes 312 are roughly arranged in a "middle-shaped" shape in the same plane. Similarly, those skilled in the art can adjust the number and arrangement of the end cap through holes 312 according to the specific use environment.

Further referring to FIG. 1 , a liquid outlet channel 22 is also provided at the bottom of the casing 200, and the liquid outlet channel 22 includes a channel inner hole 221 arranged axially on the casing 200 and a liquid outlet hole 221 arranged radially on the liquid outlet channel 22. Through hole 222 . Wherein, the channel inner hole 221 communicates with the first cooling channel 11 , the second cooling channel 21 and the connecting channel 31 through the liquid outlet through hole 222 in the cavity, so that the cooling liquid can collect into the channel inner hole 221 . Specifically, the number of liquid outlet through holes 222 is preferably two, and the two liquid outlet through holes 222 are roughly disposed inside the end covers 300 on both sides of the housing 200 . In addition, along the flow direction of the cooling liquid, a liquid outlet nozzle 26 is provided at the downstream end of the liquid outlet channel 22 , and the liquid outlet nozzle 26 can guide the cooling liquid out of the casing 200 . Preferably, a liquid outlet 25 corresponding to the downstream end of the liquid outlet channel 22 may be provided at the lower part of the end cover 300 , and the liquid outlet 25 is fixedly connected to the liquid outlet 26 . Preferably, the above-mentioned cooling liquid can be selected from cooling oil. As mentioned above, the utility model can obviously adopt other various forms of cooling liquid, as long as the cooling liquid itself is electrically insulating and will not cause corrosion to motor components such as stator windings.

Continuing to refer to FIG. 1 , a liquid inlet 23 corresponding to the liquid outlet 25 can also be provided on the casing 200, and a liquid inlet 24 is arranged on the liquid inlet 23, and the liquid inlet 24 communicates with the second cooling passage 21, After the cooling oil enters the second cooling passage 21 through the liquid inlet nozzle 24 , it can further enter the first cooling passage 11 to cool the rotating shaft 100 and the rotor 13 . And the cooling oil can form at least one cooling path in the second cooling channel 21 through the liquid inlet nozzle 24 . Preferably, the liquid inlet 23 and the liquid inlet nozzle 24 can be arranged roughly in the middle of the outer periphery of the casing 200, so that the cooling oil enters the second cooling channel 21 through the liquid inlet nozzle 24 and is divided into left and right cooling path pairs. The stator 14 is cooled.

As a preferred solution of the present invention, the casing 200 and the right end cover 300 provided with the connecting channel 31 can be integrally processed and formed. However, this structure is not unique, and those skilled in the art can make appropriate adjustments according to production conditions during actual production.

It can be seen from the above preferred embodiments that in the motor direct cooling structure of the present invention, the cooling sequence corresponding to the flow path of the cooling oil when cooling the motor is roughly: liquid inlet nozzle 24 → stator 14 → stator winding 15 → rotor 13 surface → rotating shaft 100 and core of rotor 13 → liquid outlet channel 22 → liquid outlet nozzle 26 . Specifically, after the cooling oil flows into the second cooling passage 21 through the liquid inlet nozzle 24 , it is divided into two left and right cooling paths to perform surrounding cooling on the stator 14 . Afterwards, the cooling oil flowing out of the second cooling channel 21 flows through the stator winding 15 on both sides of the stator 14 and the surface of the rotor 13 for cooling. Then the cooling oil flows into the inner hole 111 of the rotating shaft through the rotating shaft through hole 112 on both sides of the rotating shaft 100 , the end cover through hole 312 and the counterbore 311 to cool the rotating shaft 100 and the core of the rotor 13 . Finally, the cooling oil flows out of the shaft inner hole 111 through the shaft through hole 112 and the end cover through hole 312 , and flows into the channel inner hole 221 through the two liquid outlet through holes 222 , and then flows out of the casing 200 through the liquid outlet nozzle 26 .

In the preferred embodiment described above, by providing the first cooling channel 11 on the rotating shaft 100 and connecting the first cooling channel 11 with the second cooling channel 21, the connecting channel 31 and the liquid outlet channel 22 in the cavity, it can be realized While the cooling oil cools the outer surface of the stator 14 , the stator winding 15 and the outer surface of the rotor 13 , it can also cool the rotating shaft 100 and the core of the rotor 13 . The setting of this structure not only solves the problem that the direct cooling motor cannot directly cool the core of the rotor 13, but also greatly improves the cooling effect.

So far, the technical solution of the utility model has been described in conjunction with the preferred implementations shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific implementations. On the premise of not departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the utility model.

Claims (10)

1. the direct-cooled structure of a kind of motor, wherein motor include casing and end cap, and the casing and the end cap are formed with cavity, institute State be provided with cavity rotating shaft, circulating type be fixed on the rotating shaft rotor, be surrounded on the rotor stator and coil in Stator winding on the stator,

Characterized in that, the rotating shaft is provided with the first cooling duct, the second cooling duct, institute are provided with the inside of the casing State end cap and be provided with interface channel,

Wherein, first cooling duct connects in the cavity with second cooling duct, first cooling duct Connected with the interface channel respectively with second cooling duct, and

Second cooling duct is passed into coolant and the motor internal is cooled down.

2. the direct-cooled structure of motor according to claim 1, it is characterised in that first cooling duct includes setting vertically The rotating shaft endoporus being placed in inside the rotating shaft and the rotating shaft sets of vias extended to the radial outside of the rotating shaft endoporus,

Wherein, the rotating shaft endoporus is connected through the rotating shaft sets of vias in the cavity with second cooling duct, and

The rotating shaft endoporus is directly connected with the interface channel.

3. the direct-cooled structure of motor according to claim 2, it is characterised in that the rotating shaft sets of vias includes axially disposed In several rotating shaft through hole unit groups of the rotating shaft,

Radially observe, each rotating shaft through hole in each described rotating shaft through hole unit group is located in approximately the same plane.

4. the direct-cooled structure of motor according to claim 3, it is characterised in that the casing inner wall is provided with radially ring Around helicla flute,

Wherein, the part in the helicla flute is logical with second cooling that the outer wall of the stator is formed with helical structure Road, another part in the helicla flute is respectively communicated with cavity with first cooling duct and the interface channel.

5. the direct-cooled structure of motor according to claim 4, it is characterised in that the interface channel includes being arranged at the end Counter sink in the middle part of lid and several end cap through holes to counter sink radial outside extension,

Wherein, the counter sink is connected with the rotating shaft endoporus, the end cap through hole by the counter sink in cavity with it is described Second cooling duct connects.

6. the direct-cooled structure of motor according to any one of Claims 1 to 5, it is characterised in that the direct-cooled structure of the motor is also Liquid outlet channel including being arranged at the bottom of shell, the liquid outlet channel includes being axially disposed in the passage of the casing Hole and be arranged radially in the liquid outlet channel go out fluid through-hole,

Wherein, the access bore in the cavity through it is described go out fluid through-hole and first cooling duct, described second cold But passage and the interface channel are respectively communicated with, and

Observed along the flow direction of the coolant, the downstream of the liquid outlet channel is provided with liquid outlet.

7. the direct-cooled structure of motor according to claim 6, it is characterised in that the liquid outlet channel include access bore and Be arranged radially in two of the liquid outlet channel and go out fluid through-hole, it is described two go out fluid through-hole be respectively arranged at the end of housing both sides Lid inner side.

8. the direct-cooled structure of motor according to claim 7, it is characterised in that be provided with the end cap with it is described go out liquid lead to The corresponding liquid outlet in downstream in road, the liquid outlet is connected with the liquid outlet.

9. the direct-cooled structure of motor according to claim 8, it is characterised in that inlet, institute are additionally provided with the casing State and liquid inlet port is provided with inlet, the liquid inlet port is connected with second cooling duct, and the coolant is through the feed liquor Mouth forms at least one cooling path in second cooling duct.

10. the direct-cooled structure of motor according to any one of Claims 1 to 5, it is characterised in that the casing and side End cap is integral type structure, and the interface channel is arranged at the inner side of the end cap of the side；And/or the motor is electronic The motor of automobile.