CN219372120U - Motor with a motor housing - Google Patents

Abstract

The utility model discloses a motor, which comprises a shell, a rotating shaft, a rotor and a stator. The stator includes stator laminations and stator windings, and the rotor includes a rotor core and a rotor end ring. The rotating shaft is internally provided with a central oil duct for oil to enter. The inside of rotor core is formed with the rotor oil duct, and the oil inlet and the central oil duct intercommunication of rotor oil duct. An end ring oil duct is formed inside each rotor end ring, an oil inlet of the end ring oil duct is communicated with an oil outlet corresponding to the rotor oil duct, the oil outlet of the end ring oil duct is communicated with a cavity in the shell, and the oil outlet of each rotor end ring faces towards and is opposite to the corresponding stator winding, so that oil from the central oil duct flows to the end ring oil duct of each rotor end ring respectively from the oil outlets distributed at the two ends of the rotor iron core after entering the rotor oil duct through the oil inlet of the rotor oil duct, and is thrown to the corresponding stator winding from the oil outlet of the end ring oil duct under the action of centrifugal force, so that the cooling and heat dissipation effects on the stator winding are improved.

Description

Motor with a motor housing

Technical Field

The utility model relates to the technical field of electric drive cooling, in particular to a motor.

Background

With the increasing requirement of new energy automobiles on motor power density, the oil cooling technology is gradually replacing water cooling to become a mainstream design of motor cooling. The oil medium has the advantages of good insulativity, no magnetic conduction and the like, oil can be directly contacted with the heating component of the motor by adopting an oil cooling technology, the rotor and the stator of the motor are cooled in an immersed mode, the heat dissipation efficiency is higher, and the structure is compact. In order to fully utilize the oil medium to cool each heating component in the motor, the structures of the motor shell, the rotating shaft, the stator, the rotor and other components need to be improved so as to be matched with the oil flowing path.

Referring to fig. 1, a conventional electric motor employing an oil cooling technology generally includes a housing 1', a rotating shaft 3', a stator 5 'and a rotor 4', wherein a chamber 2 'for accommodating the rotating shaft 3', the stator 5 'and the rotor 4' is formed in the housing 1', the rotor 4' is sleeved outside the rotating shaft 3', the stator 5' is sleeved outside the rotor 4', and the stator 5' includes a stator lamination 51 'and stator windings 52' at two ends thereof. A central oil passage 31' for feeding oil is arranged in the rotating shaft 3', the central oil passage 31' extends along the axial direction of the rotating shaft 3', and oil outlets 311' communicated with the chamber 2' are respectively arranged at positions of two ends of the central oil passage 31' close to two ends of the rotor 4', and oil in the central oil passage 31' can enter the chamber 2' through the oil outlets 311 '. The side wall of the shell 1 'is provided with an oil supply liquid inlet cooling oil pipe 6', the cooling oil pipe 6 'is provided with a plurality of cooling oil holes 61', and oil liquid enters the cavity through each oil outlet 311 'on the central oil duct 31' and a plurality of cooling oil holes 61 'on the cooling oil pipe 6', so as to surround the stator 5 'and the rotor 4' for cooling and radiating.

However, in the prior art, the whole stator 5' is cooled and radiated by the method that the oil surrounds the outer wall surface of the stator 5', so that the heat of the stator windings 52' at two ends of the stator cannot be radiated pertinently, the oil may be thrown to other parts under the influence of working conditions or external factors, and cannot flow to the stator windings 52' in time, so that the utilization rate of the oil is low, and more heat is absorbed in the flowing process, so that the cooling effect of the stator windings 52' is poor. Under some overload working conditions, a large amount of heat can be instantaneously generated by the stator winding, and if the part of heat cannot be timely discharged, the torque output capacity of the motor can be limited, and the power density of the motor is reduced.

Disclosure of Invention

The utility model aims to solve the problem of poor cooling effect of a motor on a stator winding in the prior art. The utility model provides a motor, oil can directionally flow to a stator winding, so that the cooling effect on the stator winding is improved, and the utilization rate of the oil is improved.

In order to solve the technical problems, the embodiment of the utility model discloses a motor, which comprises a shell, a rotating shaft, a rotor and a stator, wherein a cavity for accommodating the rotor, the stator and the rotating shaft is formed in the shell. The rotor sleeve is arranged on the outer side of the rotating shaft, the stator sleeve is arranged on the outer side of the rotor, and the stator comprises stator lamination sheets and stator windings arranged at two ends of the stator lamination sheets.

The rotating shaft is internally provided with a central oil duct for oil supply liquid to enter.

The rotor comprises a rotor core and rotor end rings which are arranged at two ends of the rotor core and correspond to the stator windings, a rotor oil duct is formed in the rotor core, and the rotor oil duct is provided with an oil inlet communicated with the central oil duct and oil outlets distributed at two ends of the rotor core.

The inside end ring of each rotor is formed with the end ring oil duct, and the end ring oil duct has oil inlet and oil-out, and the oil inlet of end ring oil duct communicates with the corresponding oil-out of rotor oil duct, and the oil-out of end ring oil duct extends to the outer wall surface of rotor end ring to communicate with the cavity, and, the oil-out of each rotor end ring is towards just corresponding stator winding to make the fluid from the centre oil duct can get into the rotor oil duct through the oil inlet of rotor oil duct after, from the oil-out that distributes at rotor core both ends of rotor oil duct respectively flow to the end ring oil duct of each rotor end ring, and gets rid of from the oil-out of end ring oil duct to corresponding stator winding under centrifugal force.

By adopting the scheme, oil can enter the rotor oil duct through the central oil duct to cool the inside of the rotor, and enter the end ring oil duct inside the rotor end ring through the oil outlets at the two ends of the rotor core, as the oil outlets of the end ring oil duct face towards and are opposite to the corresponding stator windings, the oil inside the rotor end ring can be rapidly thrown towards the stator windings under the action of centrifugal force to cool and dissipate heat the stator windings in a targeted manner, the oil is ensured to flow to the stator windings directionally and rapidly, the cooling effect on the stator windings is improved, the heat generated by the stator windings can be timely discharged under the overload working condition, the torque output capacity and the power density of the motor are improved, meanwhile, the oil is prevented from being thrown towards other parts under the influence of the working condition or external factors, and the utilization rate of the oil is improved.

According to another embodiment of the present utility model, the rotor oil passage includes a plurality of main oil passages provided at regular intervals in the circumferential direction of the rotor, and a plurality of oil inlets provided in one-to-one correspondence with the plurality of main oil passages.

Each main oil duct in the plurality of main oil ducts extends to two ends of the rotor core along the axial direction of the rotor, and oil outlets of the rotor oil ducts are respectively formed at the two ends of the rotor core. One end of each oil inlet is communicated with the central oil duct, and the other end of each oil inlet is communicated with the corresponding main oil duct, so that oil in the central oil duct can enter the corresponding main oil duct through each oil inlet of the rotor oil duct.

By adopting the scheme, a plurality of main oil channels are uniformly arranged at intervals along the circumferential direction of the rotor, each main oil channel is provided with an oil inlet communicated with the central oil channel, and oil in the central oil channel can enter the corresponding main oil channel through the plurality of oil inlets so as to uniformly dissipate heat at all parts in the rotor. The two ends of each main oil duct are provided with oil outlets, and oil can enter the end ring oil duct through a plurality of oil outlets.

According to another embodiment of the present utility model, each oil inlet of the rotor oil passage is provided at a center position of the corresponding main oil passage in the extending direction thereof and extends in the radial direction of the rotor so that the oil in the center oil passage flows vertically to the corresponding main oil passage through each oil inlet of the rotor oil passage.

By adopting the scheme, the oil inlets of the main oil ducts are arranged at the central positions of the extending directions of the main oil ducts, oil can be uniformly diffused to the two ends of the rotor core from the center of the main oil duct after passing through the oil inlets, the flow path of the oil is shortened, the path lengths of the oil reaching the stator windings at the two ends from the center of the main oil duct are the same, the cooling effect on the stator windings at the two ends is uniform, the situation that the cooling and heat dissipation effects on the stator windings at one end are excessive and the cooling and heat dissipation effects on the stator windings at the other end are insufficient is avoided. The oil inlet extends along the radial direction of the rotor, namely the extending direction of the oil inlet is perpendicular to the extending directions of the central oil duct and the main oil duct, so that the length of the oil inlet is shortened, the flow path of oil is further shortened, and the motor structure is simplified.

According to another specific embodiment of the present utility model, the end ring oil passage of each rotor end ring includes a plurality of oil inlets, a plurality of oil outlets, and an annular oil passage extending in the circumferential direction of the rotor end ring, each of the oil inlets and each of the oil outlets are respectively in communication with the annular oil passage, and the plurality of oil inlets are distributed at intervals in the circumferential direction of the rotor end ring at one end of the annular oil passage near the rotor core, and the plurality of oil outlets are distributed at intervals in the circumferential direction of the rotor end ring at the outer circumferential surface of the annular oil passage.

The oil inlets of the end ring oil channels are in one-to-one correspondence with the main oil channels, and the oil inlet of each end ring oil channel is communicated with the oil outlet of the corresponding main oil channel, so that oil in any main oil channel in the plurality of main oil channels can enter the annular oil channel through the oil outlets of the two ends of the rotor core and the oil inlets of the corresponding end ring oil channels.

By adopting the scheme, the annular oil duct is arranged in the rotor end ring, the plurality of oil inlets are arranged at one side close to the rotor core along the circumferential direction of the annular oil duct at intervals, the oil inlets of the end ring oil ducts are in one-to-one correspondence with the oil outlets of the main oil duct, and oil in the main oil duct enters the annular oil duct through the plurality of oil outlets at the two ends of the main oil duct and the corresponding oil inlets of the end ring oil duct, so that the assembly precision requirements of the rotor core and the rotor end ring are reduced, and the processing is convenient. The oil outlets are arranged on the outer peripheral surface of the annular oil duct at intervals, oil in the annular oil duct rotates at high speed under the action of centrifugal force, the oil is rapidly thrown out of the annular oil duct at the positions of the oil outlets, the speed of the oil when being thrown to the stator winding is improved, and the oil can reach the position of the stator winding in time.

According to another specific embodiment of the utility model, each oil outlet of the end ring oil passage extends along the radial direction of the rotor end ring, so that oil in the annular oil passage is vertically thrown to the corresponding stator winding through each oil outlet of the end ring oil passage, the length of the oil outlet of the end ring oil passage is shortened, and the oil flow path is further shortened.

According to another embodiment of the utility model, one end of the housing is provided with a through hole communicating with the chamber, and one end of the rotating shaft penetrates through the through hole and the other end extends in a direction away from the through hole.

And, one end of the central oil duct extends to the one end that the pivot passed the through hole in order to form the inlet port, and the other end extends to the region that meets with the rotor in the pivot along the axial of pivot, and the lateral part of central oil duct is equipped with the outlet port for fluid can pass through the inside central oil duct of pivot from the outlet port of central oil duct entering rotor oil duct through the inlet port.

By adopting the scheme, one end of the rotating shaft is provided with the oil inlet and penetrates through the through hole on the shell to be communicated with the space outside the shell, so that oil can enter the rotor through the oil inlet, the oil outlet is arranged on the side part of the central oil duct, the oil outlet of the central oil duct is communicated with the oil inlet of the rotor oil duct, and the oil in the central oil duct can enter the rotor oil duct through the oil outlet of the central oil duct.

According to another embodiment of the utility model, an oil outlet is formed in the wall surface of the housing, one end of the oil outlet is communicated with the cavity, and the other end of the oil outlet is communicated with the outside of the housing, so that oil in the cavity can be discharged through the oil outlet in the housing by rotation of the rotor.

According to another embodiment of the utility model, at least one cooling oil pipe into which oil supply liquid enters is arranged on the side wall of the shell, one end of any one of the at least one cooling oil pipe penetrates through the wall surface of the shell, and the other end of the at least one cooling oil pipe extends to and covers the two ends of the stator along the axial direction of the stator.

And a plurality of cooling oil holes are uniformly arranged on any one cooling oil pipe at intervals along the extending direction of the cooling oil pipe, and the plurality of cooling oil holes are communicated with the cavity and are opposite to the outer wall surface of the stator, so that oil in any one cooling oil pipe can flow to the stator through the plurality of cooling oil holes so as to cool the stator lamination and the stator winding. And the oil inlet quantity of the cooling oil pipe and the central oil duct can be controlled separately, so that the oil quantity in each oil duct can be distributed according to the actual working condition, and the stator, the stator winding and the rotor can be cooled directionally.

According to another embodiment of the utility model, an annular gap is formed between the stator and the rotor, so that oil in the cavity can surround the inner side of the stator and the outer side of the rotor through the annular gap, and the cooling and heat dissipation effects on the stator and the rotor are enhanced.

According to another embodiment of the utility model, the at least one cooling oil pipe is a plurality of cooling oil pipes, the plurality of cooling oil pipes are uniformly distributed at intervals along the circumferential direction of the stator, and oil flowing out of the plurality of cooling oil pipes surrounds the stator, so that the heat dissipation efficiency and the heat dissipation strength of the stator are improved.

Drawings

FIG. 1 is a schematic diagram of a prior art motor;

fig. 2 is a schematic structural view of an electric motor according to an embodiment of the present utility model;

fig. 3 is a schematic cross-sectional view of a rotor in an electric motor according to an embodiment of the present utility model;

FIG. 4a is a schematic view of the cross-sectional structure of FIG. 3 in the direction A-A;

FIG. 4B is a schematic view of the cross-sectional structure in the direction B-B in FIG. 3;

fig. 4C is a schematic view of the cross-sectional structure in the direction C-C in fig. 3.

Reference numerals illustrate:

the prior art comprises the following steps:

100': motor with a motor housing

1': a housing;

2': a chamber;

3': a rotating shaft; 31': a central oil passage; 311': an oil outlet;

4': a rotor;

5': a stator; 51': stator lamination; 52': a stator winding;

6': a cooling oil pipe; 61': and a cooling oil hole.

The utility model comprises the following steps:

100: a motor;

1: a housing;

11: a through hole; 12: an oil outlet hole;

2: a chamber; 21: an annular gap;

3: a rotating shaft;

31: a central oil passage; 311: an oil inlet hole; 312: an oil outlet hole;

4: a rotor;

41: a rotor core;

411: a rotor oil passage; 4111: an oil inlet; 4112: an oil outlet; 4113: a main oil duct;

42: a rotor end ring;

421: an end ring oil passage;

4211: an annular oil passage; 4212: an oil inlet; 4213: an oil outlet;

5: a stator;

51: stator lamination; 52: a stator winding;

6: a cooling oil pipe; 61: and a cooling oil hole.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present utility model with specific examples. While the description of the utility model will be described in connection with the preferred embodiments, it is not intended to limit the inventive features to the implementation. Rather, the purpose of the utility model described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the utility model. The following description contains many specific details for the purpose of providing a thorough understanding of the present utility model. The utility model may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the utility model. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present embodiment, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present utility model.

The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 2-3, fig. 2 is a schematic structural diagram of a motor according to an embodiment of the utility model; fig. 3 is a schematic cross-sectional view of a rotor in an electric motor according to an embodiment of the present utility model.

As shown in fig. 2 to 3, an embodiment of the present utility model provides a motor 100 including a housing 1, a rotation shaft 3, a rotor 4, and a stator 5, and a chamber 2 for accommodating the rotor 4, the stator 5, and the rotation shaft 3 is formed inside the housing 1. The rotor 4 is sleeved on the outer side of the rotating shaft 3, the stator 5 is sleeved on the outer side of the rotor 4, the stator 5 comprises stator laminations 51 and stator windings 52 arranged at two ends of the stator laminations 51, and the central oil duct 31 for entering oil supply liquid is arranged inside the rotating shaft 3.

The rotor 4 includes a rotor core 41, and rotor end rings 42 provided at both ends of the rotor core 41 and corresponding to the stator windings 52, and a rotor oil passage 411 is formed in the rotor core 41, and the rotor oil passage 411 has an oil inlet 4111 communicating with the center oil passage 31, and oil outlets 4112 distributed at both ends of the rotor core 41.

In one embodiment, the housing 1 has a through hole 11 communicating with the chamber 2 at one end, and the rotating shaft 3 has one end penetrating the through hole 11 and the other end extending away from the through hole 11. And, one end of the center oil passage 31 extends to one end of the rotation shaft 3 passing through the through hole 11 to form an oil inlet hole 311, the other end extends to a region of the rotation shaft 3 in contact with the rotor 4 in the axial direction of the rotation shaft 3, and the side of the center oil passage 31 is provided with an oil outlet hole 312, so that oil can enter the rotor oil passage 411 through the oil inlet hole 311 through the center oil passage 31 inside the rotation shaft 3 from the oil outlet hole 312 of the center oil passage 31.

Referring to the arrow direction in fig. 2, oil enters the rotating shaft 3 through the oil inlet hole 311 on the rotating shaft 3 and flows along the central oil passage 31, enters the rotor oil passage 411 through the oil outlet hole 312 of the central oil passage 31, and then flows to the oil outlets 4112 at the two ends of the rotor core 41 respectively, and cools the rotor core 41 during the flowing process in the rotor oil passage 411.

As shown in fig. 2 to 3, an end ring oil passage 421 is formed inside each rotor end ring 42, the end ring oil passage 421 has an oil inlet 4212 and an oil outlet 4213, the oil inlet 4212 of the end ring oil passage 421 communicates with a corresponding oil outlet 4112 of the rotor oil passage 411, the oil outlet 4213 of the end ring oil passage 421 extends to an outer wall surface of the rotor end ring 42 and communicates with the chamber 2, and the oil outlet 4213 of each rotor end ring 42 faces and is opposite to the corresponding stator winding 52, so that oil from the center oil passage 31 can flow from the oil outlets 4112 of the rotor oil passage 411 to the end ring oil passages 421 of each rotor end ring 42, respectively, after entering the rotor oil passage 411 through the oil inlet 4111 of the rotor oil passage 411, and is thrown from the oil outlet 4213 of the end ring oil passage 421 to the corresponding stator winding 52 under centrifugal force. Because the oil outlet 4213 of the end ring oil duct 421 faces towards and is opposite to the corresponding stator winding 52, the oil in the rotor end ring 42 can be rapidly thrown to the stator winding 52 under the action of centrifugal force so as to cool and dissipate heat of the stator winding 52 in a targeted manner, and the oil is ensured to flow to the stator winding 52 directionally and rapidly, so that the cooling effect of the stator winding 52 is improved, the heat generated by the stator winding 52 can be timely discharged under the overload working condition, the torque output capacity and the power density of the motor are improved, the oil is prevented from being thrown to other parts under the influence of the working condition or external factors, and the utilization rate of the oil is improved.

Referring to fig. 4 a-4 b, fig. 4a is a schematic cross-sectional view of the direction A-A in fig. 3; fig. 4B is a schematic view of a cross-sectional structure in the direction B-B in fig. 3.

As shown in fig. 4 a-4 b and as will be understood in conjunction with fig. 3, in one embodiment, the rotor oil passage 411 includes 6 main oil passages 4113 uniformly spaced along the circumferential direction of the rotor, and 6 oil inlets 4111 provided in one-to-one correspondence with the 6 main oil passages 4113, so as to uniformly dissipate heat from various portions within the rotor 4. The number of the main oil channels 4113 and the corresponding oil inlets 4111 is not limited, and may be designed according to the specific applicable working conditions of the motor as required. For example, when the motor is used in an automobile with low power density requirements, only 2 main oil channels 4113 and 2 corresponding oil inlets 4111 can be arranged in the rotor core 41, so as to meet the cooling requirement of the motor and simplify the production process.

As shown in fig. 3, each main oil passage 4113 extends to both ends of the rotor core 41 in the axial direction of the rotor 4, and oil outlets 4112 of the rotor oil passages 411 are formed at both ends of the rotor core 41, respectively. One end of each oil inlet 4111 is communicated with the central oil passage 31, and the other end is communicated with the corresponding main oil passage 4113, so that oil in the central oil passage 31 can enter the corresponding main oil passage 4113 through each oil inlet 4111 of the rotor oil passage 411.

In one embodiment, each oil inlet 4111 of the rotor oil duct 411 is disposed at a central position of the corresponding main oil duct 4113 along the extending direction thereof, and extends in the radial direction of the rotor 4, that is, the extending direction of the oil inlet 4111 is perpendicular to the extending directions of the central oil duct 31 and the main oil duct 4113, so that the oil in the central oil duct 31 flows vertically to the corresponding main oil duct 4113 through each oil inlet 4111 of the rotor oil duct 411, and after passing through the oil inlet 4111, the oil can uniformly diffuse from the center of the main oil duct 4113 to two ends of the rotor core 41, thereby shortening the flow path of the oil, simplifying the motor structure, and the path length of the oil reaching the stator windings 52 at two ends from the center of the main oil duct 4113 is the same, so that the cooling effect on the stator windings 52 at two ends is relatively uniform, and the situation that the cooling effect on the stator windings at one end is excessive and the cooling effect on the stator windings at the other end is insufficient is avoided.

Referring to fig. 4C, fig. 4C is a schematic cross-sectional view of the C-C direction in fig. 3.

As shown in fig. 4c, and as will be understood in conjunction with fig. 3, in one embodiment, the end ring oil passage 421 of each rotor end ring 42 includes 6 oil inlets 4212, 6 oil outlets 4213, and an annular oil passage 4211 extending in the circumferential direction of the rotor end ring 42, each oil inlet 4212 and each oil outlet 4213 are respectively in communication with the annular oil passage 4211, and the 6 oil inlets 4212 are distributed at intervals in the circumferential direction of the rotor end ring at one end of the annular oil passage 4211 near the rotor core 41, and the 6 oil outlets 4213 are distributed at intervals in the circumferential direction of the rotor end ring 42 at the outer circumferential surface of the annular oil passage 4211.

The 6 oil inlets 4212 of each end ring oil passage 421 are disposed in one-to-one correspondence with the 6 main oil passages 4113, and the oil inlet 4212 of each end ring oil passage 421 is communicated with the oil outlet 4112 of the corresponding main oil passage 4113, so that the oil in any one main oil passage 4113 of the 6 main oil passages 4113 can enter the annular oil passage 4211 through the oil outlet 4112 at the two ends of the rotor core 41 and the oil inlet 4212 of the corresponding end ring oil passage 421.

The annular oil duct 4211 is arranged in the rotor end ring 42, a plurality of oil inlets 4212 are arranged at intervals along the circumferential direction of the annular oil duct 4211 at one side close to the rotor core 41, the oil inlets 4212 of the end ring oil ducts 421 are in one-to-one correspondence with the oil outlets 4112 of the main oil duct 4113, and oil in the main oil duct 4113 enters the annular oil duct 4211 through the plurality of oil outlets 4112 at two ends of the main oil duct and the oil inlets 4212 of the corresponding end ring oil duct 421, so that the assembly precision requirements of the rotor core 41 and the rotor end ring 42 are reduced, and the processing is facilitated. A plurality of oil outlets 4213 are arranged on the outer peripheral surface of the annular oil duct 4211 at intervals, oil in the annular oil duct 4211 rotates at a high speed under the action of centrifugal force, and is rapidly thrown out of the annular oil duct 4211 at the positions of the oil outlets 4213, so that the speed of the oil when being thrown to the stator winding 52 is improved, and the oil can reach the position of the stator winding 52 in time.

It will be appreciated by those skilled in the art that the number of oil inlets 4212 of the end ring oil channels 421 corresponds to the number of rotor oil channels 411, while the number of oil outlets 4213 of the end ring oil channels 421 is not limited and may be designed as needed according to the specific applicable working conditions of the motor. In addition, the annular oil passage 4211 is disposed in the rotor end ring 42, so that the oil can rotate in the annular oil passage 4211, the speed of throwing the oil toward the stator winding 52 is increased, and meanwhile, the assembly accuracy requirement of the rotor end ring 42 and the rotor core 41 is reduced, in some alternative embodiments, the annular oil passage 4211 may not be disposed in the rotor end ring 42, and the oil from the rotor oil passage 411 can flow into the end ring oil passage 421 and be thrown toward the corresponding stator winding 52 by directly communicating the oil inlet 4212 and the oil outlet 4213 of the end ring oil passage 421 with the oil outlet 4112 of the rotor oil passage 411.

As shown in fig. 4c, in one embodiment, each oil outlet 4213 of the end ring oil passage 421 extends in the radial direction of the rotor end ring 42, such that the oil within the annular oil passage 4211 is thrown vertically through each oil outlet 4213 of the end ring oil passage 421 toward the corresponding stator winding 52, shortening the length of the oil outlet 4213 of the end ring oil passage 421, further shortening the oil flow path.

As shown in fig. 2, in one embodiment, an oil outlet 12 is formed in a wall surface of the housing 1, one end of the oil outlet 12 communicates with the chamber 2, and the other end communicates with the outside of the housing 1, so that oil in the chamber 2 can be discharged through the oil outlet 12 in the housing 1 by rotation of the rotor 4. The oil outlet 12 may be located at any position on both ends or on the side wall of the casing 1.

As shown in fig. 2, in one embodiment, a cooling oil pipe 6 into which an oil supply liquid enters is provided on a side wall of the casing 1, one end of the cooling oil pipe 6 penetrates a wall surface of the casing 1, and the other end extends to and covers both ends of the stator 5 in an axial direction of the stator 5.

And, a plurality of cooling oil holes 61 are uniformly arranged on the cooling oil pipe 6 at intervals along the extending direction, and the plurality of cooling oil holes 61 are communicated with the cavity 2 and are opposite to the outer wall surface of the stator 5, so that the oil in the cooling oil pipe 6 can flow to the stator 5 through the plurality of cooling oil holes 61 to cool the stator lamination 51 and the stator winding 52. And, the oil intakes of cooling oil pipe 6 and central oil duct 31 can be separately controlled to distribute the oil in each oil duct as required according to actual working condition, realize the directional cooling to stator 5, stator winding 52 and rotor 4.

The number of the cooling oil pipes 6 and the number of the cooling oil holes 61 on each cooling oil pipe 6 are not limited, in one embodiment, the number of the cooling oil pipes 6 is plural, the plurality of cooling oil pipes 6 are uniformly distributed at intervals along the circumferential direction of the stator 5, and the stator 5 is surrounded by the oil flowing out of the plurality of cooling oil pipes 6, so that the heat dissipation efficiency and the heat dissipation strength of the stator 5 are improved. In one embodiment, the number of the plurality of cooling oil pipes 6 is 2, and 5 cooling oil holes 61 are distributed on each cooling oil pipe 6.

As shown in fig. 2, in one embodiment, an annular gap 21 is formed between the stator 5 and the rotor 4, so that the oil in the chamber 2 can surround the inside of the stator 5 and the outside of the rotor 4 through the annular gap 21, enhancing the cooling and heat dissipation effects on the stator 5 and the rotor 4.

While the utility model has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a further detailed description of the utility model with reference to specific embodiments, and it is not intended to limit the practice of the utility model to those descriptions. Various changes in form and detail may be made therein by those skilled in the art, including a few simple inferences or alternatives, without departing from the spirit and scope of the present utility model.

Claims (10)

1. An electric motor comprising a housing, a shaft, a rotor and a stator, wherein a chamber for accommodating the rotor, the stator and the shaft is formed inside the housing; the rotor is sleeved on the outer side of the rotating shaft, and the stator is sleeved on the outer side of the rotor; the stator comprises stator laminations and stator windings arranged at two ends of the stator laminations; the method is characterized in that:

a central oil duct for oil supply liquid to enter is arranged in the rotating shaft;

the rotor comprises a rotor core and rotor end rings which are arranged at two ends of the rotor core and correspond to the stator windings, a rotor oil duct is formed in the rotor core, and the rotor oil duct is provided with an oil inlet communicated with the central oil duct and oil outlets distributed at two ends of the rotor core;

an end ring oil channel is formed inside each rotor end ring, the end ring oil channel is provided with an oil inlet and an oil outlet, the oil inlet of the end ring oil channel is communicated with the corresponding oil outlet of the rotor end ring, the oil outlet of the end ring oil channel extends to the outer wall surface of the rotor end ring and is communicated with the cavity, and the oil outlet of each rotor end ring faces towards and is opposite to the corresponding stator winding, so that oil from the central oil channel can enter the rotor oil channel through the oil inlet of the rotor oil channel, and then flows to the end ring oil channels of each rotor end ring from the oil outlets distributed at the two ends of the rotor core respectively, and is thrown towards the corresponding stator winding from the oil outlet of the end ring oil channel under the action of centrifugal force.

2. The motor of claim 1, wherein the rotor oil passage includes a plurality of main oil passages provided at regular intervals along a circumferential direction of the rotor, and a plurality of the oil inlets provided in one-to-one correspondence with the plurality of main oil passages; wherein the method comprises the steps of

Each main oil duct in the plurality of main oil ducts extends to two ends of the rotor core along the axial direction of the rotor, and the oil outlets of the rotor oil ducts are respectively formed at the two ends of the rotor core; one end of each oil inlet is communicated with the central oil duct, and the other end of each oil inlet is communicated with the corresponding main oil duct, so that oil in the central oil duct can enter the corresponding main oil duct through each oil inlet of the rotor oil duct.

3. The motor of claim 2, wherein each of the oil inlets of the rotor oil passages is provided at a center position of the corresponding main oil passage in the extending direction thereof and extends in the radial direction of the rotor such that oil in the center oil passage flows vertically to the corresponding main oil passage through each of the oil inlets of the rotor oil passages.

4. The motor of claim 2, wherein the end ring oil passage of each of the rotor end rings includes a plurality of the oil inlets, a plurality of the oil outlets, and an annular oil passage extending in a circumferential direction of the rotor end ring, each of the oil inlets and each of the oil outlets being respectively in communication with the annular oil passage, and the plurality of the oil inlets being spaced apart in the circumferential direction of the rotor end ring at an end of the annular oil passage adjacent to the rotor core, the plurality of the oil outlets being spaced apart in the circumferential direction of the rotor end ring at an outer circumferential surface of the annular oil passage; wherein the method comprises the steps of

The oil inlets of the end-ring oil channels are arranged in one-to-one correspondence with the main oil channels, and the oil inlet of each end-ring oil channel is communicated with the oil outlet of the corresponding main oil channel, so that oil in any one main oil channel in the plurality of main oil channels can enter the annular oil channel through the oil outlets of the two ends of the rotor core and the oil inlets of the corresponding end-ring oil channel.

5. The motor of claim 4 wherein each of said oil outlets of said end-ring oil gallery extends radially of said rotor end ring such that oil within said annular oil gallery is thrown vertically through each of said oil outlets of said end-ring oil gallery toward a corresponding one of said stator windings.

6. The motor according to any one of claims 1 to 5, wherein one end of the housing is provided with a through hole communicating with the chamber, one end of the rotating shaft passes through the through hole, and the other end extends in a direction away from the through hole;

and, one end of the central oil duct extends to one end of the rotating shaft penetrating through the through hole to form an oil inlet, the other end extends to an area connected with the rotor in the rotating shaft along the axial direction of the rotating shaft, and an oil outlet is formed in the side portion of the central oil duct, so that oil can enter the rotor oil duct from the oil outlet of the central oil duct through the oil inlet through the central oil duct in the rotating shaft.

7. The motor of claim 6, wherein an oil outlet is formed in a wall surface of the housing, one end of the oil outlet is communicated with the chamber, and the other end is communicated with the outside of the housing, so that oil in the chamber can be discharged through the oil outlet on the housing by rotation of the rotor.

8. The motor according to any one of claims 1 to 5, wherein at least one cooling oil pipe into which an oil supply liquid enters is provided on a side wall of the housing, one end of any one of the at least one cooling oil pipe penetrates through a wall surface of the housing, and the other end extends to and covers both ends of the stator in an axial direction of the stator;

and a plurality of cooling oil holes are uniformly arranged on any one of the cooling oil pipes at intervals along the extending direction of the cooling oil pipe, and are communicated with the cavity and are right opposite to the outer wall surface of the stator, so that oil in any one of the cooling oil pipes can flow to the stator through the plurality of cooling oil holes.

9. The electric machine of claim 8, wherein an annular gap is formed between the stator and the rotor such that oil in the chamber can surround an inner side of the stator and an outer side of the rotor through the annular gap.

10. The electric machine of claim 8, wherein the at least one cooling oil pipe is a plurality of cooling oil pipes, the plurality of cooling oil pipes being evenly spaced along a circumference of the stator.