CN114221481A

CN114221481A - Motor and vehicle

Info

Publication number: CN114221481A
Application number: CN202111371712.0A
Authority: CN
Inventors: 徐浩杰; 朱殿烨; 茅伟娜; 林汝裕; 周彬; 孙新东
Original assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zeekr Automobile Ningbo Hangzhou Bay New Area Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zeekr Automobile Ningbo Hangzhou Bay New Area Co Ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-03-22
Anticipated expiration: 2041-11-18
Also published as: CN114221481B

Abstract

The invention discloses a motor and a vehicle, comprising: a housing including a housing end; the rotor assembly comprises a rotating shaft, the rotating shaft comprises a rotating shaft end part, and the rotating shaft is rotatably arranged on the shell through a main bearing; the conductive bearing is arranged at the end part of the rotating shaft, at least part of the conductive bearing is sleeved in a conductive bearing sleeve, and the bearing sleeve is provided with a conductive connecting part; the conductive piece comprises a first connecting portion, a second connecting portion and an elastic portion, one end of the elastic portion is connected with the first connecting portion, the other end of the elastic portion is connected with the second connecting portion, the first connecting portion is connected with the conductive connecting portion, and the second connecting portion is connected with the end portion of the shell. The invention connects the rotating shaft with the motor shell through the conductive bearing, the bearing sleeve and the conductive piece, and conducts away the charges on the rotating shaft in time, thereby avoiding the damage of the main bearing structure caused by the shaft current generated between the inner ring and the outer ring of the main bearing of the motor and prolonging the service life of the main bearing.

Description

Motor and vehicle

Technical Field

The invention relates to the technical field of driving motors, in particular to a motor and a vehicle.

Background

The motor is a common electric drive system, and in the operation process of the motor, due to factors such as unbalanced motor magnetism and the like, electric charges are accumulated on a motor rotor, so that shaft voltage exists between an inner ring and an outer ring of a motor bearing. Along with the gradual accumulation of charges on a motor rotor, the shaft voltage between the inner ring and the outer ring is gradually increased, when the shaft voltage is increased to a certain value, shaft current can be generated to puncture a bearing oil film, a bearing structure is damaged, electric arc scars appear on parts such as a bearing channel and the like, and the service life of the bearing is greatly reduced. Therefore, shaft currents need to be avoided to ensure the life of the motor bearings.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a motor and a vehicle, which avoid the generation of shaft current.

To achieve the above object, the present invention provides a motor including:

a housing including a housing end;

a stator assembly fixed to the housing;

the rotor assembly comprises a rotating shaft, the rotating shaft comprises a rotating shaft end part, and the rotating shaft is rotatably arranged on the shell through a main bearing;

the conductive bearing is arranged at the end part of the rotating shaft, at least part of the conductive bearing is sleeved in a conductive bearing sleeve, and the bearing sleeve is provided with a conductive connecting part;

the conductive piece comprises a first connecting portion, a second connecting portion and an elastic portion, one end of the elastic portion is connected with the first connecting portion, the other end of the elastic portion is connected with the second connecting portion, the first connecting portion is connected with the conductive connecting portion, and the second connecting portion is connected with the end portion of the shell.

Further, the length of the elastic portion is variable in the axial direction of the rotating shaft.

Further, the elastic portion is provided in a spring structure.

Furthermore, the bearing sleeve is hollow and cylindrical, the end face of one end of the bearing sleeve is provided with the conductive connecting part, and the end of the bearing sleeve is provided with a through hole;

this bearing housing is equipped with and holds the chamber, should hold the chamber and be used for holding this electrically conductive bearing, should hold chamber and this through-hole intercommunication.

Furthermore, the bearing sleeve is provided with a fixing part, and the fixing part is connected to the shell.

Further, still include the speed measuring subassembly, this speed measuring subassembly includes the rotary transformer rotor, rotary transformer fastener and rotary transformer stator, and this rotary transformer rotor and this rotary transformer fastener all overlap and locate this pivot, and this rotary transformer fastener and this pivot interference fit or transition fit, this rotary transformer fastener are located between this rotary transformer rotor and this conductive bearing.

Furthermore, the speed measuring assembly comprises a rotational stator fastening piece, a rotation stopping body is arranged on the rotational stator fastening piece, and the rotation stopping body is matched with the fixed part of the bearing sleeve, so that the fixed part is connected with the shell through the rotation stopping body, and the bearing sleeve cannot rotate relative to the shell.

Further, a first cooling liquid guiding portion is arranged at one end, close to the conductive bearing, of the rotary transformer fastener, and the first cooling liquid guiding portion comprises a first conical surface.

Further, still include the bearing fastener, this bearing fastener is fixed in the pivot terminal surface of this pivot, and this bearing fastener is equipped with second coolant liquid guide portion, and this second coolant liquid guide portion includes the second toper face.

The invention also provides a vehicle which comprises the motor according to the technical scheme.

The invention has the following beneficial effects:

the motor comprises a conductive bearing which is arranged on a rotating shaft and is electrically conducted with the rotating shaft, at least part of the conductive bearing is sleeved in a conductive bearing sleeve, the bearing sleeve is connected with a conductive piece, and the conductive piece is connected with a shell of the motor, so that the rotating shaft is electrically connected with the shell, the grounding of the rotating shaft is realized, electric charges generated on the rotating shaft can be conducted away in time, the gradual accumulation of the electric charges on the rotating shaft is avoided, the shaft voltage between an inner ring and an outer ring of a main bearing of the motor is avoided, the shaft current is generated to puncture an oil film of the main bearing, the structure of the main bearing is damaged, and the electric arc flaw is caused on parts such as a bearing channel and the like, so that the main bearing of the motor is protected, the service life of the main bearing is prolonged, the structure of the motor is simple, and the production cost can be reduced;

the electric conduction piece comprises a first connection part, a second connection part and an elastic part, the first connection part is connected with the bearing sleeve, the second connection part is connected with the end part of the shell, the rotating shaft is electrically connected with the shell of the motor through the electric conduction piece, the electric conduction piece has certain elasticity through the elastic part, and therefore stable connection between the rotating shaft and the shell can be guaranteed; in addition, when the rotating shaft moves along the axial direction of the rotating shaft, the force generated by the conductive piece due to deformation is small, so that the force acted on the bearing sleeve by the conductive piece due to deformation is small, the external force action on the conductive bearing can be reduced, and the service life of the conductive bearing can be prolonged;

the rotary transformer stator fastening piece is a component on the existing motor, and the conductive piece is fixed by the rotary transformer stator fastening piece on the motor, so that the motor structure can be prevented from being complicated, the motor structure can be simplified, and the production cost of the motor can be reduced;

the bearing sleeve is provided with the fixing part which is connected to the motor shell, so that the bearing sleeve can be prevented from rotating when the motor runs, and the conductive piece connected with the bearing sleeve is prevented from generating overlarge deformation due to the rotation of the bearing sleeve, so that the conductive piece is prevented from being damaged and losing efficacy due to the overlarge deformation, and the relative position stability among the bearing sleeve, the conductive piece and the end part of the motor shell can be maintained as much as possible when the motor runs, so that the stable connection among the bearing sleeve, the conductive piece and the end part of the motor shell is enhanced;

when adopting the coolant oil as the coolant liquid, set up first coolant liquid guide portion on rotatory change rotor fastener, be equipped with second coolant liquid guide portion at the bearing fastener, in time get rid of the coolant oil from this, avoid the coolant oil to spatter conductive bearing, dip conductive bearing and lead to the conductive grease to run off to guarantee conductive bearing's electric conductive property, and prolong conductive bearing's life.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of a motor structure provided by the present invention;

fig. 2 is a schematic view of the structure at end portion a of the motor provided by the present invention;

FIG. 3 is a schematic view of a partial structure of a motor provided by the present invention;

FIG. 4 is a schematic diagram of a bearing sleeve structure in the motor provided by the present invention;

fig. 5 is a schematic view of a conductive member structure in the motor provided by the present invention;

FIG. 6 is a schematic view of a rotary transformer stator fastener in an electric machine provided by the present invention;

FIG. 7 is a schematic view of a rotary-change rotor fastener in an electric machine provided by the present invention;

fig. 8a and 8b are schematic structural diagrams of a bearing fastener in the motor provided by the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

Example 1

The present invention provides an electric machine, as shown in fig. 1-8, comprising a housing 1, a stator assembly 3 and a rotor assembly 2.

The stator assembly 3 is fixed to the housing 1. The stator assembly 3 comprises stator windings by which a rotating magnetic field is generated.

The rotor assembly 2 comprises a shaft 21, which shaft 21 comprises a shaft end, which shaft 21 is rotatably mounted to the housing 1 via a main bearing 22.

Optionally, the rotor assembly 2 further includes a rotor winding, when the motor is operated, the rotor assembly 2 is located in a magnetic field generated by the stator winding, and a direct current is supplied to the rotor winding, so that the rotor assembly 2 can generate a torque relative to the stator assembly 3, thereby rotating the rotating shaft 21 around its axis and outputting a driving torque; or, the rotor assembly 2 further includes an iron core and magnetic steel, when the motor operates, a three-phase current is applied to the stator winding, so that the rotor assembly 2 generates a torque relative to the stator assembly 3, thereby rotating the rotating shaft 21 around its axis and outputting a driving torque.

Alternatively, as shown in fig. 1, the shell 1 includes a shell end 11, and the rotating shaft 21 is rotatably mounted to the shell end 11 of the shell 1 by a main bearing 22.

As shown in fig. 1-2, the motor includes a conductive bearing 4, and the conductive bearing 4 is mounted on the end of the rotating shaft 21. The conductive bearing 4 comprises an outer ring, an inner ring and a rolling body positioned between the outer ring and the inner ring, and conductive grease is filled in a gap between the outer ring, the inner ring and the rolling body. The conductive bearing 4 is conductive, and current can be conducted through the outer ring, the inner ring, the rolling elements, the conductive grease, and the like of the conductive bearing 4. The two ends of the conductive bearing 4 are provided with sealing rings, the sealing rings are positioned between the outer ring and the inner ring, and the space between the outer ring and the inner ring, the rolling body and the conductive grease are sealed, so that the conductive grease is prevented from being polluted and lost.

The motor further comprises a conductive bearing sleeve 41 and a conductive member 42, wherein the conductive bearing 4 is at least partially sleeved in the conductive bearing sleeve 41, and optionally, the conductive bearing 4 is completely sleeved in the conductive bearing sleeve 41. The bearing sleeve 41 is a hollow cylinder, the bearing sleeve 41 is provided with an accommodating cavity 413, the accommodating cavity 413 is used for accommodating the conductive bearing 4, the accommodating cavity 413 is matched with the outer contour of the conductive bearing 4, and optionally, the outer ring of the conductive bearing 4 is in interference fit with the inner side of the bearing sleeve 41, so that stable connection and stable contact between the outer ring of the conductive bearing 4 and the bearing sleeve are ensured. Optionally, the inner ring of the conductive bearing 4 is in interference fit, clearance fit or transition fit with the rotating shaft 21, so that the conductive bearing 4, the bearing sleeve 41 and the rotating shaft 21 are connected.

The bearing housing 41 is provided with a conductive connecting portion 411, and the conductive connecting portion 411 is used for connecting with the conductive member 42, so that current can be conducted between the bearing housing 41 and the conductive member 42. Optionally, the conductive connecting portion 411 is disposed on an end surface of one end of the bearing housing 41, and optionally, at least one conductive connecting portion is disposed on the end surface, and when the number of the conductive connecting portions is multiple, the multiple conductive connecting portions are symmetrically or asymmetrically disposed on the end surface. Preferably, the number of the conductive connection parts is 2, 3 or 4. The one end of the bearing sleeve 41 is provided with a through hole 414, the through hole 414 is communicated with the accommodating cavity 413, and when the bearing sleeve 41 and the conductive bearing 4 are sleeved on the rotating shaft 21 of the motor, the rotating shaft 21 passes through the through hole 414.

Optionally, a fixing portion 412 is disposed on the bearing sleeve 41, the fixing portion 412 is connected to the housing 1, and the fixing portion is used for stopping rotation of the bearing sleeve 41, so that the bearing sleeve 41 does not rotate when the motor operates.

The bearing housing 41 is made of a conductive material, such as metal, conductive polymer or composite conductive material.

The conductive member 42 includes a first connecting portion 421, a second connecting portion 422 and an elastic portion 423, one end of the elastic portion 423 is connected to the first connecting portion 421, the other end is connected to the second connecting portion 422, the first connecting portion 421 is connected to the conductive connecting portion 411 of the bearing housing 41, and the second connecting portion 422 is connected to the housing end portion 11. Therefore, the bearing sleeve 41 and the shell end part 11 are grounded through the conductive piece 42, and the electric charges on the motor rotating shaft 21 are conducted away and discharged in time through the conductive bearing, the bearing sleeve, the conductive piece and the shell end part in sequence.

The elastic portion 423 of the conductive member 42 has a certain elasticity at least in the axial direction of the motor rotation shaft 21, so that the elastic portion 423 has a variable length in the axial direction of the motor rotation shaft. In the operation process of the motor, the motor rotating shaft usually generates axial movement, and the elastic part 423 enables the conductive piece 42 and the bearing sleeve 41 to be stably connected when the motor rotating shaft generates the axial movement, reduces the acting force applied to the bearing sleeve 41 by the conductive piece 42, reduces the external force action applied to the conductive bearing, and is beneficial to prolonging the service life of the conductive bearing.

The first connection portion 421 of the conductive member 42 is used to connect with the conductive connection portion 411 of the bearing housing 41, and the first connection portion 421 includes a first connection member adapted to the conductive connection portion. The second connecting portion 422 of the conductive member 42 is for connecting with the housing end 11 of the motor housing, and the second connecting portion 422 includes a second connecting member.

The conductive member 42 is made of a conductive elastic material. Optionally, the resistivity of the elastic material is less than or equal to 1.5 Ω · mm²Preferably 1.2. omega. mm or less, m (20 ℃ C.)²M (20 ℃ C.). Optionally, the resilient material is spring steel and/or a copper alloy, the copper alloy being brass or bronze. Alternatively, the elastic portion 423 of the conductive member 42 is configured as a spring, preferably a tension spring. Alternatively, the first connection portion 421, the second connection portion 422 and the elastic portion 423 of the conductive member 42 are integrally formed. Exemplarily, the conductive member 42 is made of a steel wire, one end of the first connection portion 421 is connected to one end of the elastic portion 423 and extends in a first direction, the other end of the first connection portion 421 is configured as a first connection member having a ring shape, one end of the second connection portion 422 is connected to the other end of the elastic portion 423 and extends in a second direction, and the other end of the second connection portion 422 is configured as a second connection member having a ring shape; optionally, the first connecting portion 421 and/or the second connecting portion 422 are bent at a certain angle after extending for a certain length, so as to facilitate installation and fixation.

The first connection portion 421 of the conductive member 42 is connected to the bearing housing 41, and specifically, the first connection portion 421 of the conductive member 42 is connected to the bearing housing 41 through the conductive connection portion 411 of the bearing housing 41. The conductive connection portion of the bearing housing 41 includes a first screw hole, and the first connection portion 421 of the conductive member 42 is connected to the bearing housing 41 by a first screw 44, and the first screw 44 is screwed with the first screw hole. Alternatively, the first screw 44 sequentially passes through the spacer, the first connection portion 421 of the conductive member 42, and is threadedly connected to the first screw hole, so that the first connection portion 421 of the conductive member 42 is stably and stably connected to the housing end portion 11 by the first screw 44 and the spacer.

As shown in fig. 2, the motor further includes a speed measuring assembly, the speed measuring assembly includes a rotary transformer rotor 5, a rotary transformer fastener 52 and a rotary transformer stator 51, the rotary transformer rotor 5 and the rotary transformer fastener 52 are both sleeved on the rotating shaft 21, the rotary transformer fastener 52 is disposed on one side of the rotary transformer rotor 5 close to the end surface of the rotating shaft, and the rotary transformer fastener 52 fixes the rotary transformer rotor 5 in the axial direction of the rotating shaft 21. The rotary change rotor fastener 52 is an interference or transition fit with the shaft 21. The rotary transformer stator 51 is fixedly connected with the shell 1 of the motor, when the motor runs, the rotating shaft 21 of the motor drives the rotary transformer rotor 5 to axially rotate around the rotating shaft 21, and when the rotary transformer rotor 5 approaches the rotary transformer stator 51, the rotary transformer stator 51 generates a speed measurement signal, so that the rotating speed of the motor is obtained.

The tachometer assembly includes a rotating stator fastener 53, the rotating stator fastener 53 for securing the rotating stator 51. Alternatively, the rotation-variable stator 51 is fixedly connected to the housing end 11 of the housing 1 of the motor, and the rotation-variable stator fastening 53 is used to fix the rotation-variable stator 51 to the housing end 11 of the housing 1. Alternatively, the rotational stator fastening member 53 is provided in a plate-like structure, the rotational stator fastening member 53 is fixed to the housing end portion 11 by a second screw 54, the rotational stator fastening member 53 is provided with a plurality of fixing holes 531, and the housing end portion 11 is provided with a plurality of second screw holes corresponding to the fixing holes 531. The second screw 54 passes through the fixing hole 531 and is screwed with the second screw hole on the housing end portion 11, thereby fixing the resolver fastener 53 to the housing end portion 11.

Optionally, at least one second screw 54 is also used to secure conductive member 42. Illustratively, the number of the fixing holes 531 is 3, and 2 fixing holes 531 are selected from among them for fixing the conductive member 42. Specifically, the second connection portion 422 of the conductive member 42 is sleeved on the second screw, and the second screw is fixed to the end portion 11 of the housing, so that the second connection portion 422 of the conductive member 42 is connected to the end portion 11 of the housing. Optionally, a gasket and a second connection portion 422 of the conductive member 42 are sequentially sleeved on the second screw, so that the second connection portion 422 of the conductive member 42 is stably connected to the end portion 11 of the housing through the second screw and the gasket.

As shown in fig. 6, the rotation-variable stator fastening member 53 is provided with a rotation stopper 532, and the rotation stopper 532 is fitted to the fixed portion of the bearing housing 41, so that the fixed portion is connected to the housing of the motor through the rotation stopper. Optionally, the rotary-change stator fastener 53 includes a ring-shaped plate-shaped fastening base 533 and a rotation stopper 532, the fastening base 533 is provided with a plurality of fixing holes 531, the rotation stopper 532 is a plate structure, and an included angle exists between the rotation stopper and the fastening base 533, and optionally, the rotation stopper 532 is substantially perpendicular to the fastening base 533.

Optionally, the fixing portion 412 of the bearing sleeve 41 is configured as a groove, and when the conductive member 42 is fixed to the housing end 11, the rotation stop body is located in the fixing portion 412 of the bearing sleeve 41, so that the fixing portion 412 of the bearing sleeve 41 and the rotation stop body are relatively fixed, thereby the connection between the bearing sleeve 41 and the housing end is realized through the rotation stop body, so that the bearing sleeve 41 is fixed relative to the housing end and no rotation occurs. The fixing portion of the bearing housing 41 may also be configured as a protrusion, etc., and correspondingly, a hole is provided on the rotation stopper, and the rotation stopper and the fixing portion may also be configured as other structures that are adapted to each other.

Optionally, the rotary transformer rotor 5, the rotary transformer fastener 52, and the conductive bearing 4 are sequentially disposed on the rotating shaft 21, the rotary transformer rotor 5 is located at an end of the rotary transformer fastener 52 away from the end surface of the rotating shaft, and the conductive bearing 4 is located at an end of the rotary transformer fastener 52 close to the end surface of the rotating shaft.

The motor is cooled by cooling liquid, and particularly, the motor is cooled by cooling oil or cooled by cooling water. When the coolant is cooling oil, a first coolant guiding portion 521 is disposed at an end of the rotary-change rotor fastening member 52 close to the conductive bearing 4, and the first coolant guiding portion 521 includes a first tapered surface. Preferably, the first conical surface is a first conical surface, the first conical surface includes a first large diameter end and a first small diameter end, the first conical surface gradually changes from the first small diameter end to the first large diameter end, and the first small diameter end is close to the conductive bearing 4 relative to the first large diameter end. Therefore, when the motor operates, the rotating shaft 21 drives the rotary-change rotor fastening piece 52 to rotate at a high speed, the cooling oil flowing to the first conical surface or dripping to the first conical surface is thrown away, the cooling oil is prevented from being thrown to the conductive bearing 4, the phenomenon that the oil splashes to the conductive bearing 4 and is immersed into the conductive bearing 4 to cause the loss of the conductive grease is avoided, the conductive performance of the conductive bearing is ensured, and the service life of the conductive bearing is prolonged.

As shown in fig. 2, 8a and 8b, the motor further includes a bearing fastener 43, and the bearing fastener 43 is fixed on the rotating shaft 21 or on the end surface of the rotating shaft. The bearing fastener 43 fixes the conductive bearing 4 in the axial direction of the rotating shaft 21. Optionally, the bearing fastening member 43 is sleeved on the rotating shaft 21, and the bearing pressing sleeve is in interference fit with the rotating shaft 21. Alternatively, the end face of the rotating shaft is provided with a bearing fastener fixing hole, the bearing fastener is provided with a through hole, the bearing fastener is fixed to the end face of the rotating shaft 21 by a screw or a bolt, and the screw or the bolt penetrates through the through hole of the bearing fastener to be fixedly connected with the bearing fastener fixing hole.

When the coolant is the cooling oil, the bearing fastener 43 is provided with a second coolant guide portion 431, and the second coolant guide portion 431 includes a second tapered surface. Optionally, the second coolant guide 431 includes at least a portion or all of a side surface of the bearing fastener. Preferably, the second conical surface is a second conical surface, the second conical surface includes a second large diameter end and a second small diameter end, the second conical surface gradually changes from the second small diameter end to the second large diameter end, and the second small diameter end is close to the conductive bearing 4 relative to the second large diameter end. Alternatively, the second small diameter end is disposed at an end of the bearing fastener near the conductive bearing 4, and the second large diameter end is disposed at an end of the bearing fastener far from the conductive bearing 4. When the motor operates, the rotating shaft 21 drives the bearing fastener to rotate at a high speed, the cooling oil flowing to the second conical surface or dripping to the second conical surface is thrown away, the cooling oil is prevented from being thrown to the conductive bearing, and the phenomenon that the oil splashes to the conductive bearing and is immersed into the conductive bearing to cause the loss of the conductive grease is avoided, so that the conductive performance of the conductive bearing is ensured, and the service life of the conductive bearing is prolonged.

When the conductive bearing and the bearing sleeve 41 are sleeved on the rotating shaft, the rotating shaft passes through the through hole 414 of the bearing sleeve 41, one end of the bearing fastener is close to the conductive bearing, and the other end is far away from the conductive bearing and protrudes out of the end surface of the bearing sleeve 41 in the axial direction of the rotating shaft, thereby being beneficial to throwing away cooling oil through the bearing fastener.

In addition, the present embodiment provides an assembling method of a motor, where the motor is the motor according to the above technical solution, and the assembling method includes the following steps:

mounting the rotary transformer 5 to the rotary shaft 21;

installing a rotation stator 51 on the motor end cover, and installing a rotation stator fastener 53 on the motor end cover, wherein the rotation stator 21 is fixed by the rotation stator fastener, and the rotation stator fastener is connected to the motor end cover by a screw 8;

mounting the rotor fastener 52 to the rotary shaft 21 such that the rotor fastener 52 fixes the rotor axially on the rotary shaft 21;

at least partially sleeving the conductive bearing 4 in the conductive bearing sleeve 41, and mounting the conductive bearing 4 to the rotating shaft 21;

fixing the bearing fastener to the rotating shaft 21 such that the bearing fastener fixes the conductive bearing 4 in the axial direction;

the first connection portion 421 of the conductor 42 is connected to the bearing housing 41, and the second connection portion 422 of the conductor 42 is connected to the case end portion 11.

Alternatively, the order of the mounting steps in the above mounting method can be appropriately adjusted by those skilled in the art to facilitate the assembly of the motor according to actual situations.

Example 2

The invention also provides a vehicle which comprises the motor in the technical scheme.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. An electric machine, comprising:

a housing (1) comprising a housing end (11);

a stator assembly (3) fixed to the housing (1);

the rotor assembly (2) comprises a rotating shaft (21), the rotating shaft (21) comprises a rotating shaft end, and the rotating shaft (21) is rotatably mounted on the shell (1) through a main bearing (22);

the conductive bearing (4) is installed at the rotating shaft end part of the rotating shaft (21), the conductive bearing (4) is at least partially sleeved in a conductive bearing sleeve (41), and the bearing sleeve (41) is provided with a conductive connecting part;

the conductive piece (42) comprises a first connecting portion (421), a second connecting portion (422) and an elastic portion (423), one end of the elastic portion (423) is connected with the first connecting portion (421), the other end of the elastic portion is connected with the second connecting portion (422), the first connecting portion (421) is connected with the conductive connecting portion, and the second connecting portion (422) is connected with the shell end portion (11).

2. The electric machine according to claim 1, characterized in that the length of the elastic part (423) is variable in the axial direction of the rotation shaft.

3. An electric machine as claimed in claim 1 or 2, characterized in that the resilient part is provided as a spring structure.

4. The motor according to claim 1, wherein the bearing sleeve (41) is hollow and cylindrical, one end face of the bearing sleeve (41) is provided with the conductive connecting part, and the one end of the bearing sleeve (41) is provided with a through hole (414);

the bearing sleeve (41) is provided with an accommodating cavity, and the accommodating cavity is used for accommodating the conductive bearing (4).

5. An electric machine according to claim 4, characterized in that the bearing housing (41) is provided with a fixing part (412), the fixing part (412) being connected to the housing (1).

6. The motor according to claim 5, further comprising a speed measuring assembly, wherein the speed measuring assembly comprises a rotary transformer rotor (5), a rotary transformer fastening member (52) and a rotary transformer stator (51), the rotary transformer rotor (5) and the rotary transformer fastening member (52) are both sleeved on the rotating shaft (21), the rotary transformer fastening member (52) is in interference fit or transition fit with the rotating shaft (21), and the rotary transformer fastening member (52) is located between the rotary transformer rotor and the conductive bearing (4).

7. The motor according to claim 6, wherein the speed measuring assembly comprises a rotary stator fastening member (53) having a rotation stopper fitted to the fixed portion so that the fixed portion is connected to the housing through the rotation stopper.

8. The electric machine according to claim 6, characterized in that the end of the rotor fastener (52) close to the conductive bearing (4) is provided with a first coolant guiding portion (521), the first coolant guiding portion (521) comprising a first conical surface.

9. The electric machine according to claim 1, further comprising a bearing fastener (43), the bearing fastener (43) being fixed to a shaft end face of the rotating shaft (21), the bearing fastener (43) being provided with a second coolant guiding portion (431), the second coolant guiding portion (431) including a second tapered surface.

10. A vehicle, characterized in that the vehicle comprises an electric machine according to any one of claims 1 to 9.