CN206313565U - Motor rotor oil cooling structure and motor with same - Google Patents

Abstract

The utility model belongs to the motor field, concretely relates to motor rotor oil cooling structure and motor that has this oil cooling structure. In order to further improve the cooling effect on the motor rotor, the oil cooling structure of the motor rotor comprises a rotating shaft and a rotor core arranged at the radial outer side of the rotating shaft in an interference fit mode, a plurality of through grooves are distributed on the rotor core along the circumferential direction, a guide bar is embedded in each through groove, and a first cooling channel is arranged in at least one part of the guide bars, so that the guide bars can be directly cooled by cooling oil arranged in the first cooling channel; the two ends of the first cooling channel are provided with a first oil inlet and a first oil outlet, and cooling oil entering the first cooling channel from the first oil inlet flows out of the rotor through the first oil outlet. The technical scheme of the utility model among, through set up the through-hole on the rotor conducting bar as cooling channel for the cooling oil can flow through this cooling channel and then directly cool off the rotor, thereby has effectively reduced the rotor temperature, has promoted the cooling effect.

Description

Motor rotor oil cooling structure and motor with the oil cooling structure

technical field

The utility model belongs to the field of motors, in particular to a motor rotor oil cooling structure and a motor with the oil cooling structure.

Background technique

Copper rotor asynchronous motors are successfully used as traction motors for electric vehicles due to their advantages of high efficiency and high reliability. Different from the permanent magnet motor, when the asynchronous motor is running continuously, the loss generated in the rotor short-circuit ring causes the rotor of the asynchronous motor to reach a very high temperature. Therefore, the cooling structure design of the asynchronous motor, especially its rotor, has become a measure of the performance of the asynchronous motor. one of the key factors.

At present, the motor is usually cooled by water cooling or oil cooling. When the motor is cooled by water cooling, the structure for cooling the stator is usually to provide a cooling water channel in the casing of the motor and water inlets and water outlets located at both ends of the cooling water channel. Cooling water flows into the cooling channel from the water inlet and flows out from the water outlet, thereby cooling the stator. The structure of the cooling rotor is usually to set the rotor shaft as a hollow shaft, and then insert a cooling water pipe through the rotor shaft, and the cooling water flowing out from the aforementioned water outlet flows into the cooling water pipe to further cool the rotor. The process of cooling the motor by means of oil cooling is usually to directly spray oil to the end of the winding through the oil channel on the motor casing to cool the stator. Then the cooling oil falls on the motor rotor under the action of gravity, and under the centrifugal force of the motor rotor rotation, the cooling oil falling on the motor rotor splashes on the end cover, bearing and rotating shaft, thereby realizing the cooling of the rotor.

It can be known from the above that when cooling water passes through the hollow part of the rotor shaft to cool the rotor, since the cooling water cannot directly act on the rotor, the cooling efficiency of the rotor is reduced. When the method of cooling the rotor by dropping the cooling oil after cooling the stator winding onto the rotor, although the cooling oil can directly act on the rotor, the cooling oil first passes through the stator winding and then falls to the rotor part , may cause uneven cooling of the rotor. Therefore, in order to further improve the cooling effect on the motor rotor, the utility model makes a further improvement on the existing cooling structure of the motor rotor.

Utility model content

In order to solve the above problems in the prior art, that is, to further improve the cooling effect on the motor rotor, the utility model proposes an oil cooling structure for the motor rotor. The motor rotor includes a rotating shaft and a rotor core arranged on the radially outer side of the rotating shaft in a manner of interference fit. Guide bars are embedded, at least a part of the guide bars are provided with a first cooling passage, so that the cooling oil placed in at least one of the first cooling passages can directly cool the guide bars; the first cooling passage The two ends of each have a first oil inlet and a first oil outlet, and the cooling oil entering the first cooling channel from the first oil inlet flows out of the rotor through the first oil outlet.

In a preferred embodiment of the above motor rotor oil cooling structure, each of the guide bars is provided with at least one of the first cooling passages, and/or each of the guide bars has the same number of the first cooling channels. cooling channel.

In a preferred embodiment of the above motor rotor oil cooling structure, the first cooling channel has an inclined structure along the direction from the first oil inlet to the first oil outlet, and the inclined structure can make the The cooling oil in a cooling channel flows out from the first oil outlet along the inclined structure under the action of gravity.

In a preferred embodiment of the above motor rotor oil cooling structure, the first cooling channel is close to the rotating shaft on the side close to the rotating shaft along the direction from the first oil inlet to the first oil outlet direction is inclined.

In a preferred embodiment of the above motor rotor oil cooling structure, the diameter of the first oil inlet is smaller than the diameter of the first oil outlet.

On the other hand, the present invention also provides a motor, which includes a casing and end covers arranged on both sides of the casing, the casing and the end covers form a cavity, and the cavity is set There is a rotor, a stator coaxially arranged on the outside of the rotor, and a stator winding around the stator, and the rotor has the motor rotor oil cooling structure mentioned above.

In a preferred embodiment of the above motor, a second cooling passage is provided on the top of the casing, and a second oil inlet and a second oil outlet are provided on the outside of the second cooling passage. The cooling oil that enters the second cooling channel through the oil inlet flows out of the casing through the second oil outlet; a first oil injection port and a second oil injection port are arranged on the inner side of the second cooling channel, And thus, the cooling oil entering the second cooling channel can be sprayed into the stator winding through the first oil injection port and the second oil injection port.

In a preferred embodiment of the above motor, a third cooling channel communicating with the second cooling channel is provided on the end cover, and a third cooling channel communicating with the first cooling channel is provided on the third cooling channel. The cooling oil that enters the third cooling channel enters the first cooling channel through the third oil injection port.

In a preferred embodiment of the above motor, at least one third oil outlet is provided at the bottom of the casing, and the cooling oil flowing out from the first cooling channel flows out of the casing through the third oil outlet.

In a preferred embodiment of the above motor, the third cooling channel is arranged on the end cover connected to the power output end of the rotating shaft.

To sum up, in the technical solution of the present utility model, by opening a through hole on the guide bar of the rotor as a cooling channel (the first cooling channel), the cooling oil can flow through the cooling channel and directly cool the rotor, thereby effectively reducing the The temperature of the rotor is improved, and the cooling effect is improved. Furthermore, by arranging the cooling passage in an inclined structure, it is more conducive to the outflow of cooling oil. On the other hand, in the motor with the motor rotor oil cooling structure provided by the utility model, by setting corresponding cooling passages on the casing and the end cover respectively, and cooperating with the cooling passages in the motor rotor oil cooling structure, Therefore, the overall cooling efficiency of the motor is greatly improved.

Description of drawings

Fig. 1 is the structural representation of the cross-section of the motor rotor of the present utility model (the lower half of symmetry is omitted in the figure);

Fig. 2 is a schematic structural view of the longitudinal section of the guide bar arranged in the rotor core of the present invention;

Fig. 3 is a structural schematic diagram of the motor of the present invention.

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 various components in the drawings are drawn in a specific scale, the proportional relationship is only exemplary, and those skilled in the art can make adjustments as needed so as to adapt to specific applications.

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 orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present 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 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 invention can be understood according to specific situations.

Referring to FIG. 1 , FIG. 1 is a structural schematic diagram of a cross-section of the motor rotor of the present invention. As shown in Figure 1, the motor rotor 1 mainly includes a rotating shaft 11 and a rotor core 12 arranged radially outside the rotating shaft 11 in an interference fit manner. A guide bar 13 is embedded in the groove, and at least one first cooling channel 131 can be set in at least a part of the guide bar 13, so that the cooling oil placed in the first cooling channel 131 can directly cool the guide bar 13, that is, the guide bar 13 The generated heat can be directly taken away by the cooling oil, which can effectively reduce the rotor temperature and improve the cooling effect. Preferably, at least one first cooling channel 131 can be provided in each guide bar 13 , and each guide bar 13 has the same number of first cooling channels 131 . In this embodiment, a first cooling channel 131 is provided in each guide bar 13 as an example for illustration. Apparently, two, three or even more first cooling passages 131 may be provided in each guide bar 13 .

Referring to FIG. 2 , FIG. 2 is a structural schematic diagram of the longitudinal section of the guide bar arranged in the rotor core of the present invention. As shown in Figure 2, both ends of the first cooling passage 131 have a first oil inlet 1311 and a first oil outlet 1312, the cooling oil entering the first cooling passage 131 from the first oil inlet 1311 passes through the first oil outlet Port 1312 flows out of rotor 1 of the motor. Wherein, the first cooling passage 131 has an inclined structure along the direction from the first oil inlet 1311 to the first oil outlet 1312, and the inclined structure can make the cooling oil entering the first cooling passage 131 move from the first cooling passage 131 along the inclined structure under the action of gravity. An oil outlet 1312 flows out. Specifically, the first cooling channel 131 is inclined toward the direction close to the rotating shaft 11 along the direction from the first oil inlet 1311 to the first oil outlet 1312 on the side close to the rotating shaft 11 (the bottom of the first cooling channel 131 in FIG. 2 side slopes down from left to right). That is to say, when the cooling oil enters the first cooling passage 131 from the first oil inlet 1311, since the first cooling passage 131 has an inclined structure, the cooling oil can follow the inclined surface of the first cooling passage 131 under the action of gravity. flow, and then flow out from the first oil outlet 1312. Therefore, through the inclined structure of the utility model, the circulation of the cooling oil is more favorable, and the cooling efficiency is further improved. In addition, when the motor rotor 1 is rotating, the cooling oil in the first cooling passage 131 can also flow out from the first oil outlet 1312 along the first cooling passage 131 under the action of centrifugal force. In addition, in this embodiment, the diameter of the first oil inlet 1311 can be made smaller than the diameter of the first oil outlet 1312, so that the cooling oil in the first cooling passage 131 can be effectively prevented from flowing from the first cooling channel 131 under the action of centrifugal force. An oil inlet 1311 flows out.

On the other hand, the utility model provides a motor. Referring to Fig. 3, Fig. 3 is a structural schematic diagram of the motor of the present invention. As shown in FIG. 3 , the motor mainly includes a casing 4 and a front end cover 41 (left side in FIG. 3 ) and a rear end cover 42 (right side in FIG. 3 ) arranged on both sides of the casing 4 . The casing 4 , the front end cover 41 and the rear end cover 42 form a cavity, and the rotor 1 , the stator 5 coaxially arranged outside the rotor 1 , and the stator winding 51 surrounding the stator 5 are arranged in the cavity. Among them, the rotor 1 mainly includes a rotating shaft 11 and a rotor core 12 arranged radially outside the rotating shaft 11 in an interference fit manner. A plurality of through slots are distributed along the circumferential direction of the rotor iron core 12, and each through slot is embedded with a The guide bar 13 may be provided with a first cooling channel 131 in the guide bar 13 , so that the cooling oil placed in the first cooling channel 131 can directly cool the guide bar 13 .

Further referring to FIG. 3 , the top of the casing 4 is provided with a second cooling channel 40 , and a second oil inlet 401 and a second oil outlet 402 are arranged on the outside of the second cooling channel 40 . The cooling oil in the second cooling channel 40 can flow out of the casing 4 through the second oil outlet 402 . Preferably, the inner side of the second cooling passage 40 is also provided with a first oil injection port 403 and a second oil injection port 404, so that the cooling oil entering the second cooling passage 40 can pass through the first oil injection port 403 and the second oil injection port 403. The second oil injection port 404 is sprayed into the stator winding 51 to cool the stator winding 51 .

Further, the power output end of the rotating shaft 11 is connected to the front end cover 41, and the third cooling passage 421 communicating with the second cooling passage 40 may be provided on the front end cover 41, and the third cooling passage 421 is provided with the first cooling passage 421. The passage 131 communicates with the third oil injection port 4211 , and the cooling oil entering the third cooling passage 421 enters the first cooling passage 131 through the third oil injection port 4211 . Specifically, the third oil injection port 4211 cooperates with the first oil inlet 1311 of the first cooling passage 131, so that the cooling oil sprayed from the third oil injection port 4211 can enter the first oil inlet 1311 from the first oil inlet 1311. The cooling channel 131 , and then the cooling oil flows out from the first oil outlet 1312 along the first cooling channel 131 under the action of gravity or the centrifugal force of the rotor rotation, and drops to the bottom of the motor. Specifically, the cooling oil drops to the bottom of the motor along the gap between the rear end cover 42 and the rotor 1 , the stator 5 and the stator winding 51 surrounding the stator 5 . It should be noted that part of the cooling oil entering the stator winding 51 from the second cooling channel 40 through the first oil injection port 403 and the second oil injection port 404 can pass through the third oil injection port 4211 through the first oil inlet port. 131 enters the first cooling passage 13, and another part may drop to the bottom of the motor along the gap between the rear end cover 42 and the rotor 1, the stator 5 and the stator windings surrounding the stator 5.

Further, at least one third oil outlet 43 is provided at the bottom of the casing 4 , and the cooling oil flowing out of the first cooling channel 131 flows out of the casing 4 through the third oil outlet 43 . Preferably, a fourth oil outlet 44 is provided at the bottom of the motor, so that the circulation of cooling oil in the motor can be accelerated. More preferably, the third oil outlet 43 and the fourth oil outlet 44 are respectively arranged on the front end cover 41 and the rear end cover 42 .

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. a kind of rotor oil cooling structure, the rotor includes rotating shaft and is arranged at the rotating shaft in an interference fit The rotor core of radial outside, it is characterised in that the rotor core is circumferentially distributed some grooves, in each described groove Sliver is embedded with, at least one first cooling ducts are provided with least a portion sliver, to cause to be placed in described first Cooling oil in cooling duct can directly cool down the sliver；

The two ends of first cooling duct have the first oil inlet and the first oil-out, enter described from first oil inlet The cooling oil of the first cooling duct flows out the rotor through first oil-out.

2. rotor oil cooling structure according to claim 1, it is characterised in that be provided with each described sliver to Few first cooling duct, and/or

First cooling duct with equal number in each described sliver.

3. rotor oil cooling structure according to claim 2, it is characterised in that first cooling duct is along described One oil inlet to first oil-out the inclined structure in direction, the incline structure can make enter first cooling duct Cooling oil flowed out from first oil-out along the incline structure under gravity.

4. rotor oil cooling structure according to claim 3, it is characterised in that first cooling duct is near institute The side for stating rotating shaft inclines along first oil inlet to the direction of first oil-out near the direction of the rotating shaft.

5. rotor oil cooling structure according to claim 3, it is characterised in that the bore of first oil inlet is less than The bore of first oil-out.

6. a kind of motor, its end cap for including casing and being arranged at the casing both sides, the casing and the end cap are formed There is cavity, rotor, the stator being coaxially disposed on the outside of the rotor are provided with the cavity and are surrounded on the stator Stator winding, it is characterised in that the rotor has the rotor oil cooling structure any one of claim 1 to 5.

7. motor according to claim 6, it is characterised in that the second cooling duct is provided with the top of the casing, The second oil inlet and the second oil-out are provided with the outside of second cooling duct, described second is entered from second oil inlet The cooling oil of cooling duct flows out the casing through second oil-out；

The first jet and the second jet are provided with the inside of second cooling duct, and therefore make to enter described second Cooling oil in cooling duct can be injected into the stator winding by first jet and second jet.

8. motor according to claim 7, it is characterised in that be provided with the end cap and second cooling duct connects The 3rd logical cooling duct, the 3rd jet connected with first cooling duct is provided with the 3rd cooling duct, Cooling oil into the 3rd cooling duct enters first cooling duct by the 3rd jet.

9. the motor according to any one of claim 6 to 8, it is characterised in that the bottom of the casing is provided with least One the 3rd oil-out, the casing is flowed out from the cooling oil of first cooling duct outflow by the 3rd oil-out.

10. motor according to claim 8, it is characterised in that the 3rd cooling duct is arranged on the connection rotating shaft Clutch end the end cap on.