CN117060612A

CN117060612A - Motor and vehicle power system

Info

Publication number: CN117060612A
Application number: CN202210491939.7A
Authority: CN
Inventors: 刘磊; 龚宇
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2022-05-07
Filing date: 2022-05-07
Publication date: 2023-11-14

Abstract

The application proposes an electric motor and a vehicle power system, the electric motor comprising: the motor comprises a motor shell (1), wherein the motor shell (1) is provided with an oil inlet channel (11); a stator (2), the stator (2) comprising a stator core (21) and a stator winding (22), the stator core (21) being provided with a cooling channel (L) extending in an axial direction (a) of the motor, the cooling channel (L) being located inside the stator core (21); and an oil collector (6), the oil collector (6) defining an oil chamber at one axial end of the stator core (21), the oil chamber being in communication with the oil inlet passage (11), the oil chamber being in communication with the cooling passage (L), so that a cooling medium can flow from the oil inlet passage (11) into the cooling passage (L) via the oil chamber, thereby cooling the stator (2).

Description

Motor and vehicle power system

Technical Field

The present application relates to an electric machine and a vehicle powertrain.

Background

As shown in fig. 1 to 3, one possible motor includes a motor housing 1, a stator 2, a rotor 3, and an oil spray ring 4, the stator 2 including a stator core 21 and stator windings 22, the stator windings 22 protruding from both axial ends of the stator core 21.

The motor housing 1 is provided with an oil inlet channel 11 for cooling oil to flow into the motor housing 1, two oil injection rings 4 are respectively arranged on two axial sides of the stator 2, the oil injection rings 4, the stator iron core 21 and the inner wall of the motor housing 1 enclose a cavity, and the cavity is communicated with the oil channel. The motor housing 1 may include a housing body and an end cover. The oil spray ring 4 near the opening of the housing body of the motor housing 1 (or near the end cap, right side in fig. 1) may be fixed to the motor housing 1 by bolts. A sealing ring 5 is also arranged between the motor housing 1 and the oil injection ring 4, so that the cavity can be kept sealed. The oil injection ring 4 is provided with oil holes. Arrows in fig. 1 indicate the flow direction of the cooling oil. The cooling oil can flow into both cavities through the oil inlet channel 11 in the motor housing 1, and the cooling oil can then be sprayed through the oil holes to the stator 2, in particular to the stator windings 22 for cooling thereof.

The cooling oil mainly contacts the axially opposite end portions of the stator winding 22 and the outer peripheral surface of the stator core 21, so that the internal heat dissipation of the stator 2 is insufficient, and particularly the temperature of the intermediate portion of the stator winding 22 is still high, which affects the motor performance.

Moreover, the motor comprises two oil injection rings 4, two sealing rings 5 and a plurality of bolts, more parts are required to be manufactured respectively, and the processed parts are more in characteristics, so that the production cost is higher, and the reliability of the motor is reduced due to the fact that more parts are connected.

Disclosure of Invention

The application aims to overcome or at least alleviate the defects of the motor and provides a motor with good heat dissipation effect.

An embodiment of the present application proposes a motor including:

the motor housing is provided with an oil inlet channel;

a stator including a stator core and a stator winding, the stator core being provided with a cooling passage extending in an axial direction of the motor, the cooling passage being located inside the stator core; and

and the oil collector is used for limiting an oil cavity at one axial end of the stator core, the oil cavity is communicated with the oil inlet channel, and the oil cavity is communicated with the cooling channel, so that cooling medium can flow into the cooling channel from the oil inlet channel through the oil cavity, and the stator is cooled.

In at least one possible embodiment, the stator core is provided with a stator winding mounting groove extending in an axial direction of the motor, a portion of the stator winding being located in the stator winding mounting groove, the cooling passage communicating with the stator winding mounting groove.

In at least one possible embodiment, a plurality of said cooling channels are provided around each of said stator winding mounting slots.

In at least one possible embodiment, a plurality of the cooling channels are separated by a protrusion for supporting the stator winding.

In at least one possible embodiment, the cooling channel extends through the stator core in an axial direction of the motor.

In at least one possible embodiment, the oil collector is provided with a wedge groove, the stator winding is embedded in the wedge groove, and the side wall of the wedge groove is tightly matched with the stator winding, so that the oil cavity is sealed.

In at least one possible embodiment, the motor housing is provided with an oil collecting plate extending in the circumferential direction and the axial direction of the motor, the oil collecting plate and an inner wall of the motor housing defining a first oil chamber, the first oil chamber being in communication with the oil inlet passage.

In at least one possible embodiment, the oil collector extends in a circumferential direction and a radial direction of the motor, the oil collector and the stator define a second oil chamber, the second oil chamber communicates with the cooling passage, and the first oil chamber communicates with the second oil chamber.

In at least one possible embodiment, a plurality of the second oil chambers are provided along the circumferential direction of the motor, the plurality of the second oil chambers being partitioned by the stator winding.

The embodiment of the application also provides a vehicle power system, which comprises the motor in any one of the technical schemes.

Through adopting above-mentioned technical scheme, make cooling medium can flow through stator core's inside, it is better to the cooling effect of stator, is favorable to improving motor's performance.

Drawings

Fig. 1 shows a schematic diagram of one possible motor.

Fig. 2 shows a schematic illustration of a fuel injection ring of a possible electric motor.

Fig. 3 shows a schematic illustration of a further injection ring of a possible electric motor.

Fig. 4 shows a schematic structural view of a motor according to an embodiment of the present application.

Fig. 5 shows a partial enlarged view of fig. 4.

Fig. 6 shows a schematic structural view of a stator of an electric machine according to an embodiment of the present application.

Fig. 7 shows a schematic structural view of an oil collector of an electric motor according to an embodiment of the present application.

Fig. 8 shows a schematic view of another angle of an oil collector of an electric machine according to an embodiment of the present application.

Fig. 9 shows a partial cross-sectional view of the motor along line B-B in fig. 5 according to an embodiment of the present application.

Fig. 10 shows a partial cross-sectional view of the motor along line D-D in fig. 5 according to an embodiment of the present application.

Description of the reference numerals

1. Oil collecting plate of oil inlet channel 12 of motor shell 11

2. Insulating paper for stator 21 stator core 211 convex part 22 stator winding 221 wire 222

3. Rotor

4. Oil spray ring

5. Sealing ring

6. Oil collector 61 wedge groove 62 oil cavity groove

R1 first oil cavity R2 second oil cavity L cooling channel

Aaxial Rradial Ccircumferential.

Detailed Description

To more clearly illustrate the above objects, features and advantages of the present application, specific embodiments of the present application are described in detail in this section with reference to the accompanying drawings. The present application can be embodied in various forms other than those described in this section, and modifications, variations, and alternatives thereto can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not limited to the specific examples disclosed in this section. The protection scope of the present application shall be subject to the claims.

As shown in fig. 4 to 10, the embodiment of the present application provides a motor that may be used for a pure electric vehicle, a hybrid vehicle, or the like.

Embodiments of the present application also provide a vehicle powertrain that may include an electric motor and a transmission mechanism according to embodiments of the present application, which may include a plurality of gears for changing the rotational speed/torque of the output of the electric motor, etc., and/or for changing the rotational speed/torque of the input to the electric motor, etc. As an example, the speed change mechanism may be connected to wheels, an engine, or the like.

The motor of the embodiment of the present application includes a motor housing 1, a stator 2, a rotor 3, and an oil collector 6, the rotor 3 is rotatably connected to the motor housing 1 with respect to the stator 2, and the stator 2 may be disposed radially outside the rotor 3. The stator 2 includes a stator core 21 and stator windings 22, and the stator windings 22 may protrude from both ends of the stator core 21 in the axial direction a. In the present application, the portions of the stator winding 22 protruding from both ends in the axial direction a of the stator core 21 are also sometimes referred to as end stator windings.

As shown in fig. 4, 5, 9, and 10, the stator core 21 is provided with a stator winding mounting groove extending in the axial direction a of the motor, and a part of the stator winding 22 (an intermediate portion of the stator winding 22) is fitted into the stator winding mounting groove.

The stator core 21 is provided with a cooling passage L extending in the axial direction a of the motor, which may penetrate the stator core 21 in the axial direction a of the motor, the cooling passage L being located inside the stator core 21 instead of on the circumferential surface. The cooling oil passing through the cooling passage L can cool the stator core 21 and the stator winding 22, particularly, the middle portion of the stator winding 22. The cooling oil may pass through the cooling passage L in the axial direction to cool an end stator winding (at the right end in fig. 4) at an end remote from the first oil chamber R1 and the second oil chamber R2 described later.

As shown in fig. 10, the side wall of the stator winding mounting groove is provided with a protrusion 211, the protrusion 211 may extend in the axial direction a of the motor, and the protrusion 211 and the stator winding 22 define a cooling passage L. The protrusion 211 may serve to support the stator winding 22, and the plurality of cooling passages L are separated by the protrusion 211. A plurality of cooling passages L are provided around each stator winding mounting groove, and the cooling passages L communicate with the stator winding mounting grooves so that the cooling oil passing through the cooling passages L can directly contact the stator winding 22, thereby having a good cooling effect on the stator winding 22, particularly on the portion of the stator winding 22 embedded in the stator winding mounting grooves.

As shown in fig. 4 and 5, the motor housing 1 is provided with an oil inlet passage 11, so that cooling oil can flow into the inside of the motor housing 1 through the oil inlet passage 11.

The motor housing 1 is provided with an oil collecting plate 12, and the oil collecting plate 12 may extend in the circumferential direction C and the axial direction a of the motor housing 1 to form a cylindrical shape. The oil collecting plate 12 can be integrally formed on the motor housing 1, for example, the motor housing 1 and the oil collecting plate 12 can be integrally formed by casting, so that the motor housing 1 has fewer parts, lower cost, simplified assembly process and higher reliability of the assembled motor. And because the oil collecting plate 12 and the motor housing 1 are integrally formed, a sealing ring is not required to be used between the oil collecting plate 12 and the motor housing 1 to ensure tightness.

The oil collecting plate 12 and the inner wall of the motor housing 1 enclose a first oil chamber R1 capable of containing cooling oil, the first oil chamber R1 can extend along the axial direction a and the circumferential direction C, the first oil chamber R1 can be located at one axial end of the stator core 21, and the first oil chamber R1 is communicated with the oil inlet channel 11.

As shown in fig. 4 to 10, the oil collector 6 is provided at one end (left end in fig. 4) in the axial direction a of the stator core 21, and the oil collector 6 may be annular, the oil collector 6 extending in the circumferential direction C and the radial direction R of the motor as a whole. The oil collector 6 may be made of plastic material or injection molded with plastic material.

The oil collector 6 is provided with a wedge groove 61, and the wedge groove 61 may be a stripe shape extending in the radial direction R of the oil collector 6, and the wedge groove 61 may be formed to open on the inner peripheral surface of the oil collector 6 so that the stator winding 22 may be fitted into the wedge groove 61. The wedge groove 61 may be provided in plurality, and the plurality of wedge grooves 61 are arranged in the circumferential direction C of the motor. The sidewalls of the wedge grooves 61 and the stator winding 22 may be tightly fitted such that the second oil chamber R2 is sealed (including substantially sealed).

It will be appreciated that the oil collector 6 may comprise an outer ring portion and a plurality of fingers projecting radially inwardly from the outer ring portion, the sidewalls of which may be in close engagement with the stator windings 22.

The side of the oil collector 6 facing the stator core 21 is provided with oil grooves 62, and the oil grooves 62 may be provided in plurality, the plurality of oil grooves 62 being arrayed in the circumferential direction C of the motor. The oil collector 6 contacts the stator core 21 so that the oil chamber groove 62 forms a second oil chamber R2, and the second oil chamber R2 can extend in the circumferential direction C and the radial direction R of the motor. The second oil chamber R2 communicates with the cooling passage L, and the cooling oil can flow from the second oil chamber R2 to the cooling passage L.

The second oil chamber R2 may be provided in plurality, and the plurality of second oil chambers R2 are arranged in the circumferential direction C of the motor and partitioned by the stator winding 22. The stator winding 22 fitted into the wedge groove 61 may serve as a side wall defining the second oil chamber R2, and the wedge groove 61 and the oil chamber groove 62 may be alternately arranged.

When the oil collector 6 is mounted, the oil collector 6 and the stator core 21 may be positioned first, then the stator winding 22 is mounted to connect the oil collector 6 and the stator core 21, and finally the oil collector 6 is firmly connected to the stator core 21 by potting or bonding.

As shown in fig. 5 and 8, the oil collecting plate 12 and the oil collector 6 are in contact with each other, and the first oil chamber R1 and the second oil chamber R2 are connected in a sealed manner. The first oil chamber R1 is located radially outside the second oil chamber R2, and the oil chamber groove 62 may form an opening in the outer peripheral surface of the oil collector 6, the opening communicating the first oil chamber R1 and the second oil chamber R2. The first oil chamber R1 and the second oil chamber R2 may be collectively referred to as oil chambers.

The cooling oil introduced into the motor housing 1 from the oil inlet passage 11 may flow from the first oil chamber R1 to the second oil chamber R2. The unidirectional arrows in fig. 5 indicate the flow direction of the cooling oil. It will be appreciated that the first and second oil chambers R1, R2 need not be completely sealed and that cooling oil, after leaking through the gap between the oil collection plate 12 and the oil collector 6, may flow to the end stator windings to cool the end stator windings.

It will be appreciated that the oil collection plate 12 may be formed with a plurality of oil holes through which cooling oil may flow out of the first oil chamber R1 to cool the end stator windings.

As shown in fig. 9, the stator core 21 is provided with a stator winding mounting groove extending in the axial direction a thereof, and the stator winding 22 is mounted to the stator core 21 through the stator winding mounting groove.

The stator winding 22 may include a wire 221 such as a copper wire and an insulating paper 222 wrapping the wire 221. The insulating paper 222 may insulate the wires 221 from the stator core 21 and/or insulate the multi-phase wires 221.

It will be appreciated that although the stator windings are illustratively shown in the figures as comprising flat copper wire, the stator windings may be flat wire windings (e.g., hairpin windings). However, the present application is not limited thereto, and for example, the stator winding may further include a round copper wire, and the stator winding may be a wound winding.

The unidirectional arrows in fig. 5 and 10 illustrate the flow direction of the cooling oil. Referring to fig. 5 and 10, the flow of cooling oil is described, in which the cooling oil flows from the oil inlet passage 11 into the first oil chamber R1, flows from the first oil chamber R1 into the second oil chamber R2, and during the flow from the first oil chamber R1 into the second oil chamber R2, the cooling oil may leak at the gap between the oil collecting plate 12 and the oil collector 6, and the leaked cooling oil may flow to the end stator winding at one end (from the left end in fig. 4) to cool the end stator winding. Then, the cooling oil flows from the second oil chamber R2 into the cooling passage L in which the cooling oil flows in the axial direction a of the motor, so that the cooling oil can flow into the stator core 21 from one end (from the left end in fig. 4) of the stator core 21 and flow out from the other end (the right end in fig. 4) of the stator core 21, and the stator core 21 and the stator winding 22 can be cooled during the flow of the cooling oil. After the cooling oil flows out of the stator core 21 through the cooling passage L, the end stator windings (at the right end in fig. 4) at the ends distant from the first oil chamber R1 and the second oil chamber R2 can be cooled.

The cooling oil can flow through the inside of the stator core 21 and be in direct contact with the stator winding 22, so that the cooling effect is good, and the performance of the motor can be improved.

The present application has been described in detail using the above embodiments, but the following description will be made.

(I) In the above embodiment, the cooling passage L and the stator winding mounting groove communicate, but the present application is not limited thereto, and in other possible embodiments, the cooling passage and the stator winding mounting groove may be independent of each other.

(II) in the above embodiment, the cooling oil is taken as an example of the cooling medium, but the present application is not limited thereto, and the cooling medium may be other fluid, and the words of the features of the first oil chamber, the second oil chamber, the oil collecting plate, the oil collector, and the like in the present application are not limited to the cooling medium, and only the above embodiment is described.

(III) in the above-described embodiment, the oil collecting plate 12 is integrally formed to the motor housing 1, however, the present application is not limited thereto, and the oil collecting plate and the motor housing may be formed separately.

While the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as modified embodiments without departing from the spirit and scope of the present application as defined by the claims. Accordingly, the descriptions in this specification are for the purpose of illustration and are not intended to be limiting in any way.

Claims

1. An electric machine, comprising:

the motor comprises a motor shell (1), wherein the motor shell (1) is provided with an oil inlet channel (11);

a stator (2), the stator (2) comprising a stator core (21) and a stator winding (22), the stator core (21) being provided with a cooling channel (L) extending in an axial direction (a) of the motor, the cooling channel (L) being located inside the stator core (21); and

-an oil collector (6), the oil collector (6) defining an oil chamber at one axial end of the stator core (21), the oil chamber being in communication with the oil inlet passage (11), the oil chamber being in communication with the cooling passage (L), enabling a cooling medium to flow from the oil inlet passage (11) into the cooling passage (L) via the oil chamber, thereby cooling the stator (2).

2. An electric machine according to claim 1, characterized in that the stator core (21) is provided with stator winding mounting slots extending in the axial direction (a) of the electric machine, a part of the stator winding (22) being located in the stator winding mounting slots, the cooling channels (L) communicating with the stator winding mounting slots.

3. An electric machine according to claim 2, characterized in that a plurality of said cooling channels (L) are provided around each of said stator winding mounting slots.

4. The electric machine according to claim 1, characterized in that a plurality of the cooling channels (L) are separated by a protrusion (211), the protrusion (211) being intended to support the stator winding (22).

5. An electric machine according to claim 1, characterized in that the cooling channel (L) extends through the stator core (21) in the axial direction (a) of the electric machine.

6. An electric machine according to claim 1, characterized in that the oil collector (6) is provided with wedge grooves (61), the stator winding (22) being embedded in the wedge grooves (61), the side walls of the wedge grooves (61) and the stator winding (22) being tightly fitted so that the oil chamber is sealed.

7. The electric machine according to claim 1, characterized in that the electric machine housing (1) is provided with an oil collecting plate (12), the oil collecting plate (12) extending in the circumferential direction (C) and the axial direction (a) of the electric machine, the oil collecting plate (12) and the inner wall of the electric machine housing (1) defining a first oil chamber (R1), the first oil chamber (R1) being in communication with the oil inlet channel (11).

8. The electric machine according to claim 7, characterized in that the oil collector (6) extends in the circumferential direction (C) and in the radial direction (R) of the electric machine, the oil collector (6) and the stator (2) defining a second oil chamber (R2), the second oil chamber (R2) being in communication with the cooling channel (L), the first oil chamber (R1) being in communication with the second oil chamber (R2).

9. An electric machine according to claim 8, characterized in that a plurality of the second oil chambers (R2) are provided along the circumferential direction (C) of the electric machine, the plurality of the second oil chambers (R2) being partitioned by the stator winding (22).

10. A vehicle powertrain comprising an electric machine as claimed in any one of claims 1 to 9.