Dynamic balancing plate, motor and vehicle

Abstract

The application provides a dynamic balance plate, a motor comprising the dynamic balance plate, and a vehicle comprising the motor. The dynamic balance plate comprises a dynamic balance plate body, an introduction groove for introducing a cooling medium from a motor rotor arranged on the dynamic balance plate body, and an outlet groove for leading the cooling medium to a motor stator, wherein a plurality of the introduction grooves and a plurality of the outlet grooves are uniformly staggered along the circumference of the dynamic balance plate body. According to the technical scheme of the application, the flow and cooling of the cooling medium from the rotor to the stator are realized in the existing structure space of the motor, the close combination with the structure of the motor itself is realized, and thus the size of the motor cooling system is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of motor cooling, in particular to a dynamic balance plate for motor cooling and a motor comprising the same, and further relates to a vehicle comprising the motor. BACKGROUND

[0002] New energy vehicles are one of the development trends of the automobile industry. Hybrid electric vehicles have received widespread attention in recent years due to battery technology and cost considerations. Traditional new energy vehicle motors are mostly cooled by water cooling. Water-cooled motors need an additional shell with integrated cooling oil channels to wrap the motor inside, which increases the size and cost of the motor, and also cannot cool the motor rotor, so the motor must use high-cost magnetic steel to avoid demagnetization caused by high temperature; the motor structure using oil cooling can better cool the temperature of the motor rotor permanent magnet, so that the motor design can use lower temperature-resistant grade magnetic steel, thereby reducing the cost of the motor.

[0003] Considering the size and cost of the hybrid electric vehicle power transmission mechanism integrated system, it is crucial to design a motor cooling structure with better cooling effect. SUMMARY

[0004] An aspect of the present application aims to provide a dynamic balance plate for a motor rotor.

[0005] Another aspect of the present application aims to provide a motor comprising the aforementioned dynamic balance plate.

[0006] Still another aspect of the present application aims to provide a vehicle comprising the aforementioned motor.

[0007] To achieve one of the aforementioned purposes, according to one aspect of the present application, a dynamic balance plate is provided, wherein the dynamic balance plate comprises: a dynamic balance plate body provided with an axle hole through which a motor rotating shaft passes; an inlet groove provided on the dynamic balance plate body and communicating with the axle hole, and used for guiding a cooling medium from a motor rotor; an outlet groove provided on the dynamic balance plate body and used for guiding the cooling medium to a motor stator; wherein a plurality of the inlet grooves and a plurality of the outlet grooves are uniformly staggered along the circumferential direction of the dynamic balance plate body.

[0008] In addition to one or more of the above features, or as an alternative, in further embodiments, the inlet groove is internally provided with a protrusion, and an inner side wall of the inlet groove and the protrusion enclose a flow channel of the cooling medium.

[0009] In addition to one or more of the above features, or as an alternative, in further embodiments, the width of the flow channel is constant.

[0010] In addition to one or more of the features described herein, or as an alternative, in further embodiments the raised top surface is flush with a surface of the dynamic balance plate body.

[0011] In addition to one or more of the features described herein, or as an alternative, in further embodiments the dynamic balance plate body includes a first surface on which the lead-in slot and the lead-out slot are arranged.

[0012] In addition to one or more of the features described herein, or as an alternative, in further embodiments the dynamic balance plate body further includes a second surface opposite the first surface, the lead-out slot penetrating the dynamic balance plate body from the first surface to the second surface.

[0013] In addition to one or more of the features described herein, or as an alternative, in further embodiments the lead-out slot includes: a through-hole that penetrates the dynamic balance plate body; a first ramp disposed on a first side of the through-hole close to a center of the dynamic balance plate body and having a first guide slope that inclines radially toward the through-hole; and a second ramp disposed on a second side of the through-hole away from the center of the dynamic balance plate body and having a second guide slope that inclines radially away from the through-hole.

[0014] In addition to one or more of the features described herein, or as an alternative, in further embodiments the first guide slope is configured as a slope that gradually decreases in width toward the through-hole; and / or the second guide slope is configured as a slope that is constant or gradually increases in width away from the through-hole.

[0015] In addition to one or more of the features described herein, or as an alternative, in further embodiments the dynamic balance plate further includes a ring slot arranged along the shaft hole of the dynamic balance plate body and communicating the motor rotor with the lead-in slot.

[0016] To achieve at least one of the foregoing objects, according to another aspect of the present application, there is provided a motor, the motor including: a rotor having a rotation shaft and a rotor core; a stator; first and second dynamic balance plates configured to include a structure of the dynamic balance plate as described in the foregoing aspect; wherein the first and second dynamic balance plates are arranged in a staggered manner on both sides of the motor such that the lead-in slot and the lead-out slot of the first dynamic balance plate are respectively aligned with the lead-out slot and the lead-in slot of the second dynamic balance plate; and wherein the rotor is in communication with the first and / or second dynamic balance plates via a first flow path, the first dynamic balance plate is in communication with the second dynamic balance plate via a second flow path, and the stator is in communication with the first and / or second dynamic balance plates via a third flow path.

[0017] In addition to one or more of the features described above, or as an alternative, in further embodiments the first flow path includes a first axial bore disposed along a longitudinal axis of the rotor shaft, a first radial bore disposed radially of the rotor shaft, and a guide channel disposed axially of the rotor core; wherein the first axial bore is in fluid communication with the first radial bore, and the first radial bore is in fluid communication with the guide channel; and wherein the cooling medium flows to the lead-in slot of the first dynamic balance plate and / or the second dynamic balance plate in sequence via the first axial bore, the first radial bore, and the guide channel.

[0018] In addition to one or more of the features described above, or as an alternative, in further embodiments the first flow path further includes a second axial bore and a second radial bore of a bushing disposed outside the rotor shaft; wherein the second axial bore is in fluid communication with the first radial bore, and the first radial bore is in fluid communication with the guide channel via the second axial bore and the second radial bore; and wherein the cooling medium flows to the lead-in slot of the first dynamic balance plate and / or the second dynamic balance plate in sequence via the first axial bore, the first radial bore, the second axial bore, the second radial bore, and the guide channel.

[0019] In addition to one or more of the features described above, or as an alternative, in further embodiments the second flow path includes a weight-reducing hole disposed axially within the rotor core; wherein the lead-in slot of the first dynamic balance plate and the lead-out slot of the second dynamic balance plate are in communication through the weight-reducing hole; and / or the lead-out slot of the first dynamic balance plate and the lead-in slot of the second dynamic balance plate are in communication through the weight-reducing hole.

[0020] To achieve at least one of the foregoing objects, the present application also provides a vehicle including the electric machine as described in the foregoing aspects.

[0021] The dynamic balance plate, the electric machine including the dynamic balance plate, and the vehicle including the electric machine according to the present application, by configuring the lead-in slot for leading in the cooling medium from the rotor of the electric machine and the lead-out slot for leading out the cooling medium to the stator of the electric machine on the dynamic balance plate body, realize the flow and cooling of the cooling medium from the rotor to the stator within the existing structural space of the electric machine, realize the close combination with the structure of the electric machine itself, and thus optimize the size of the cooling system of the electric machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] The disclosure of the present application will become apparent from the following detailed description, taken in combination with the accompanying drawings. It is to be understood that the drawings are designed s merely for purposes of illustration and not as a definition of the limits of the application. In the drawings:

[0023] Figure 1is a perspective view of a dynamic balancing plate according to an embodiment of the present application;

[0024] Figure 2 is shown Figure 1 is a perspective view of another angle of the dynamic balancing plate shown,

[0025] Figure 3 is a front view of a dynamic balancing plate according to another embodiment of the present application;

[0026] Figure 4 is a perspective view of a dynamic balancing plate according to yet another embodiment of the present application;

[0027] Figure 5 is shown Figure 4 is a perspective view of another angle of the dynamic balancing plate shown, and

[0028] Figure 6 is a sectional view of a cooling structure of a motor according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The present application will be described in detail below with reference to exemplary embodiments illustrated in the attached drawings. It should be understood, however, that the present application can be realized in various other forms and should not be limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the application to those skilled in the art.

[0030] Furthermore, for any individual technical features described or implicit in the embodiments mentioned herein, or shown or implicit in the drawings, the present application still allows for any combination or deletion of these technical features (or their equivalents) to be continued without any technical obstacles, thereby obtaining further other embodiments of the present application that can not be directly mentioned herein.

[0031] Figure 1 is a perspective view of a dynamic balancing plate according to an embodiment of the present application, Figure 2 is shown Figure 1 is a perspective view of another angle of the dynamic balancing plate shown, the dynamic balancing plate of the present application being used to be arranged on both sides of a motor to form a ring of a cooling flow path in a motor cooling system.

[0032] As can be seen from the figure, the dynamic balance plate structure can include a dynamic balance plate body 1 with an axle hole for the motor rotating shaft to pass through, an import groove 2 and an export groove 3 arranged on the dynamic balance plate body 1. The import groove 2 is used to import the cooling medium from the motor rotor, and the export groove 3 is used to export the cooling medium to the motor stator, thereby achieving the temporary storage and guidance of the cooling medium. In this embodiment, in order to ensure that the dynamic balance plate realizes the basic function of self-adjusting balance, each feature arranged on the dynamic balance plate body should be kept symmetrical. For example, a plurality of import grooves 2 and a plurality of export grooves 3 can be uniformly staggered along the circumference of the dynamic balance plate body 1, that is, one export groove 3 is arranged between every two import grooves 2. Then, by arranging two dynamic balance plates in a staggered manner on both sides of the motor, the cooling medium can flow from the import groove of one dynamic balance plate to the corresponding export groove of the other dynamic balance plate via two different flow channels.

[0033] In this arrangement, the dynamic balance plate described herein realizes the flow and cooling of the cooling medium from the rotor to the stator within the existing structural space of the motor, realizes the close combination with the structure of the motor itself, and optimizes the size of the motor cooling system.

[0034] Further modifications of the dynamic balance plate will be described below by way of example in order to further improve its working efficiency, reliability or for other improvements.

[0035] For example, as shown in the figure, a protrusion 4 can also be arranged inside the import groove 2. At this time, the inner side wall of the import groove 2 and the protrusion 4 enclose a flow channel of the cooling medium, thereby limiting the flow direction of the cooling medium, so that the cooling medium can flow along the inner side wall of the import groove 2 in order to effectively cool the internal structure of the motor close to the import groove 2, such as the rotor permanent magnet. When the dynamic balance plate is applied in the motor, the flow channel communicates with the weight-reducing hole in the motor rotor core, and at this time, the protrusion 4 limits the cooling medium flowing through the flow channel to flow along the side close to the rotor permanent magnet in order to more effectively cool the rotor permanent magnet. Preferably, the width of the flow channel is constant, thereby stabilizing the flow rate of the cooling medium and enabling it to smoothly pass through the flow channel.

[0036] On this basis, the top surface of the protrusion 4 can be configured to be flush with the surface of the dynamic balance plate. At this time, when the dynamic balance plate is assembled to the motor rotor, the surface of the dynamic balance plate and the top surface of the protrusion 4 are in contact with and form a seal with the motor rotor respectively, so that the enclosed import groove 2 forms a semi-closed space, reducing the cooling medium overflowing from the flow channel, so that the cooling medium is fully utilized, thereby improving the directional cooling effect.

[0037] For example, in the illustrated embodiment, the import groove 2 and the export groove 3 are arranged on the same surface of the dynamic balance plate body 1, as shown in the figure. At this time, the import groove 2 and the export groove 3 are arranged in a staggered manner along the circumference of the dynamic balance plate body 1, that is, one export groove 3 is arranged between every two import grooves 2. Figure 1As shown, the first surface 5 is configured to face the motor rotor when the two dynamic balancing plates are respectively installed on the two sides of the motor, thus providing two cooling flow channels. In other embodiments, the inlet groove 2 and the outlet groove 3 can also be respectively arranged on different surfaces of the dynamic balancing plate body 1, such as arranging the inlet groove 2 on the first surface 5 and arranging the outlet groove 3 on the Figure 2 As shown, the second surface 6 is configured to face the motor rotor when the two dynamic balancing plates are respectively installed on the two sides of the motor, thus providing a single cooling flow channel.

[0038] Also, in the illustrated embodiment, the outlet groove 3 penetrates the dynamic balancing plate body 1 from the first surface 5 to the second surface 6, and the cooling medium flows from the rotor to the motor stator through the outlet groove 3, thereby cooling the motor stator.

[0039] More specifically, the outlet groove 3 can include a through hole 7, a first inclined platform 8, and a second inclined platform 9. The first inclined platform 8 is arranged on a first side of the through hole 7 close to the center of the dynamic balancing plate body 1, and has a first guide slope 10 inclined radially towards the through hole 7 to facilitate the inflow of the cooling medium; the second inclined platform 9 is arranged on a second side of the through hole 7 away from the center of the dynamic balancing plate body 1, and has a second guide slope 11 inclined radially away from the through hole 7 to facilitate the outflow of the cooling medium. The cooling medium is guided along the first guide slope 10 to the through hole 7, and flows through the through hole 7 to the second guide slope 11, and then is thrown onto the motor stator under the action of centrifugal force to be cooled.

[0040] As shown, the first guide slope 10 is configured as a slope with a width gradually decreasing towards the through hole 7, and the design of the width facilitates the guiding and acceleration of the cooling medium on the first guide slope 10, thereby facilitating the outflow of the cooling medium from the through hole 7. The second guide slope 11 is configured as a slope with a width gradually increasing away from the through hole 7, so as to reduce the impact of the cooling medium on the inner wall surface of the outlet groove, thereby reducing the resistance of the cooling medium when flowing out. In alternative embodiments, the second guide slope 11 can also be a constant width, thereby reducing the complexity of processing.

[0041] Figure 3 is a front view of a dynamic balancing plate according to another embodiment of the present application. In addition to the foregoing features, the dynamic balancing plate of the present application can also have a ring groove 12 arranged along the shaft hole of the dynamic balancing plate body 1 and in communication with the inlet groove 2, and the inlet groove 2 communicates with the motor rotor through the ring groove 12. The arrangement of the ring groove 12 allows the cooling medium to flow into the inlet groove 2 from the motor rotor via any position on the inner edge of the dynamic balancing plate, without necessarily being directly opposite the inlet groove 2.

[0042] Figure 4is a perspective view of a dynamic balance plate according to yet another embodiment of the present application, and Figure 5 shows Figure 4 shows another perspective view of a dynamic balance plate. As shown, the inlet grooves 2 can have an asymmetric structure with respect to a single center line, but a plurality of inlet grooves 2 can be integrally formed in a center-symmetric structure so as to define the flow direction of the cooling medium in the inlet grooves 2 by the rotation of the motor rotor. As shown, a weight-reducing groove 13 can also be provided on the dynamic balance plate to reduce the weight of the dynamic balance plate.

[0043] As Figure 5 shown, the second guide slope 11 of the outlet groove 3 does not extend to the edge of the second surface 6 of the dynamic balance plate, and this design still achieves the effect of saving the thickness of the dynamic balance plate and does not affect the arrangement of the weight-reducing groove 13.

[0044] Figure 6 is a cross-sectional view of a cooling structure of a motor according to an embodiment of the present application. The motor includes a rotor having a rotation shaft 14 and a rotor core 15, a stator (not shown in the figure), a first dynamic balance plate 16 and a second dynamic balance plate 17, wherein the first dynamic balance plate 16 and the second dynamic balance plate 17 are configured to include the structure of the dynamic balance plate in any of the preceding embodiments or a combination thereof. Among them, the first dynamic balance plate 16 and the second dynamic balance plate 17 are arranged in a staggered manner on both sides of the motor, so that the inlet groove 2 and the outlet groove of the first dynamic balance plate 16 are respectively aligned with the outlet groove 3 and the inlet groove of the second dynamic balance plate 17.

[0045] A first axial hole 18 is provided along the longitudinal axis of the rotation shaft 14, a first radial hole 19 is provided along the radial direction of the rotation shaft 14, and a guide channel 20 is provided along the axial direction of the rotor core 15. Among them, the first axial hole 18 is in communication with the first radial hole 19, and the first radial hole 19 is in communication with the guide channel 20. When cooling the motor, the cooling medium can flow to the inlet grooves of the first dynamic balance plate 16 and / or the second dynamic balance plate 17 in sequence via the first axial hole 18, the first radial hole 19 and the guide channel 20.

[0046] As shown, the motor can also include a bushing 21 provided outside the rotation shaft 14 to improve the connection between the rotation shaft and the rotor core. The bushing 21 includes a second axial hole 22 and a second radial hole 23. Among them, the second axial hole 22 is in communication with the first radial hole 19, and the first radial hole 19 is in communication with the guide channel 20 via the second axial hole 22 and the second radial hole 23. When cooling the motor, the cooling medium flows in sequence via the first axial hole 18, the first radial hole 19, the second axial hole 22, the second radial hole 23 and the guide channel 20 to the inlet grooves of the first dynamic balance plate 16 and / or the second dynamic balance plate 17.

[0047] In the illustrated embodiment, the weight-reducing holes 24 are arranged in the rotor core 15 along the axial direction thereof. The lead-in grooves 2 of the first dynamic balance plate 16 and the lead-out grooves 3 of the second dynamic balance plate 17 are communicated through the weight-reducing holes 24; and / or the lead-out grooves of the first dynamic balance plate 16 and the lead-in grooves of the second dynamic balance plate 17 are communicated through the weight-reducing holes 24. The cooling medium flowing into the lead-in grooves 2 of the first dynamic balance plate 16 flows to the lead-out grooves 3 of the second dynamic balance plate 17 through the weight-reducing holes; and / or the cooling medium flowing into the lead-in grooves of the second dynamic balance plate 17 flows to the lead-out grooves of the first dynamic balance plate 16 through the weight-reducing holes. The cooling medium flowing through the weight-reducing holes cools the rotor structure near the weight-reducing holes, and the cooling medium flows out of the lead-out grooves of the first dynamic balance plate 16 and / or the second dynamic balance plate 17 to cool the stator.

[0048] In this arrangement, the motor according to the present application makes the cooling medium flow into the lead-in grooves of the dynamic balance plates through the shaft, the rotor core, and then into the weight-reducing holes in the rotor core, and then from the lead-out grooves of the dynamic balance plates on the other side, which effectively reduces the temperature of the motor rotor and the magnetic steel; finally, the cooling medium is thrown out of the lead-out grooves of the dynamic balance plates to the motor stator, which can further reduce the temperature of the motor stator. This cooling structure can effectively reduce the temperature of the motor rotor, so that the motor can use lower temperature-resistant permanent magnets, thereby significantly reducing the cost of the motor. The cooling medium thrown out of the stator can effectively reduce the temperature of the motor stator, thereby reducing the copper loss of the motor, and the efficiency of the motor is significantly improved. In addition, the present application makes full use of the motor shaft, rotor bushing, rotor core, and dynamic balance plate to develop a cooling flow path, avoiding additional cooling structures, and significantly reducing the size and cost of the motor.

[0049] The above examples mainly illustrate the dynamic balance plate, motor, and vehicle of the present application. Although only some embodiments of the present application are described, those skilled in the art should understand that the present application can be implemented in many other forms without departing from the spirit and scope of the present application. Therefore, the examples and embodiments shown are considered illustrative rather than limiting, and the present application can encompass various modifications and alternatives without departing from the spirit and scope of the present application as defined by the appended claims.

Claims

1. A dynamic balancing plate for use with an electric machine rotor, characterized by, The dynamic balance plate comprises: a dynamic balance plate body (1) provided with an axle hole through which a motor rotating shaft (14) passes; an inlet groove (2) provided on the dynamic balance plate body (1) and communicating with the axle hole and used for guiding a cooling medium from a motor rotor; an outlet groove (3) provided on the dynamic balance plate body (1) and used for guiding the cooling medium to a motor stator; wherein a plurality of the inlet grooves (2) and a plurality of the outlet grooves (3) are uniformly staggered along a circumference of the dynamic balance plate body (1), wherein the inlet groove (2) is internally provided with a protrusion (4), the inlet groove (2) is arranged around the protrusion (4), a flow channel of the cooling medium is formed between an inner side wall of the inlet groove (2) and the protrusion (4), a width of the flow channel is constant, and a top surface of the protrusion (4) is flush with a surface of the dynamic balance plate body (1).

2. The dynamic balancing plate according to claim 1, characterized in that, The dynamic balance plate body (1) comprises a first surface (5), and the inlet groove (2) and the outlet groove (3) are arranged on the first surface (5).

3. The dynamic balancing plate of claim 2, wherein, The dynamic balance plate body (1) further comprises a second surface (6) opposite to the first surface (5), and the outlet groove (3) penetrates the dynamic balance plate body (1) from the first surface (5) to the second surface (6).

4. The dynamic balancing plate of claim 3, wherein, The outlet groove (3) comprises: a through hole (7) penetrating the dynamic balance plate body (1); a first inclined table (8) provided on a first side of the through hole (7) close to a center of the dynamic balance plate body (1) and having a first guide inclined surface (10) inclined radially towards the through hole (7); and a second inclined table (9) provided on a second side of the through hole (7) away from the center of the dynamic balance plate body (1) and having a second guide inclined surface (11) inclined radially away from the through hole (7).

5. The dynamic balancing plate of claim 4, wherein, The first guide inclined surface (10) is configured as an inclined surface with a gradually decreasing width towards the through hole (7); and / or the second guide inclined surface (11) is configured as an inclined surface with a constant or gradually increasing width away from the through hole (7).

6. A dynamic balancing plate according to any one of claims 1-5, characterized in that The dynamic balance plate further comprises a ring groove (12) arranged along the axle hole of the dynamic balance plate body (1) and communicating the motor rotor with the inlet groove (2).

7. An electric machine characterized by The motor comprises: a rotor having a rotating shaft (14) and a rotor core (15); a stator; a first dynamic balance plate (16) and a second dynamic balance plate (17), the first dynamic balance plate (16) and the second dynamic balance plate (17) are configured to contain the structure of the dynamic balance plate of any one of claims 1-6; wherein the first dynamic balance plate (16) and the second dynamic balance plate (17) are arranged in a staggered manner on two sides of the motor, so that the inlet groove (2) and the outlet groove (3) of the first dynamic balance plate (16) are respectively aligned with the outlet groove (3) and the inlet groove (2) of the second dynamic balance plate (17); and The rotor is in communication with the first dynamic balance plate (16) and / or the second dynamic balance plate (17) through a first flow path, the first dynamic balance plate (16) is in communication with the second dynamic balance plate (17) through a second flow path, and the stator is in communication with the first dynamic balance plate (16) and / or the second dynamic balance plate (17) through a third flow path.

8. The electric machine of claim 7, wherein, The first flow path includes a first axial hole (18) arranged along the longitudinal axis of the rotating shaft (14), a first radial hole (19) arranged along the radial direction of the rotating shaft (14), and a guide channel (20) arranged along the axial direction of the rotor core (15). The first axial hole (18) is in communication with the first radial hole (19), and the first radial hole (19) is in communication with the guide channel (20); and The cooling medium flows to the first dynamic balance plate (16) and / or the second dynamic balance plate (17) through the first axial hole (18), the first radial hole (19), and the guide channel (20) in sequence.

9. The electric machine of claim 8, wherein, The first flow path further includes a second axial hole (22) and a second radial hole (23) of a bushing (21) arranged outside the rotating shaft (14); The second axial hole (22) is in communication with the first radial hole (19), and the first radial hole (19) is in communication with the guide channel (20) through the second axial hole (22) and the second radial hole (23); and The cooling medium flows to the first dynamic balance plate (16) and / or the second dynamic balance plate (17) through the first axial hole (18), the first radial hole (19), the second axial hole (22), the second radial hole (23), and the guide channel (20) in sequence.

10. The electric machine of claim 7, wherein, The second flow path includes a weight-reducing hole (24) arranged in the rotor core (15) in the axial direction; the inlet groove (2) of the first dynamic balance plate (16) and the outlet groove (3) of the second dynamic balance plate (17) are in communication through the weight-reducing hole (24); and / or the outlet groove (3) of the first dynamic balance plate (16) and the inlet groove (2) of the second dynamic balance plate (17) are in communication through the weight-reducing hole (24).

11. A vehicle comprising the electric machine according to any one of claims 7-10.

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