CN220358900U - Rotor assembly and motor - Google Patents

Abstract

The application provides a rotor assembly and a motor. The rotor assembly comprises a rotating shaft and a rotor, wherein the rotating shaft is provided with a first runner; the rotor comprises an iron core and magnetic steel arranged in the iron core, the iron core further comprises a second runner communicated with the first runner, and the second runner at least partially takes the outer surface of the magnetic steel as a side wall. The application can improve cooling efficiency and cooling uniformity, reduce the risk of demagnetizing the magnetic steel, improve the actual output performance of the motor, and reduce economic loss.

Description

Rotor assembly and motor

Technical Field

The application relates to the technical field of driving, in particular to a rotor assembly and a motor.

Background

With the rapid development of new energy automobiles, the performance requirements of the market on the power system of the electric automobiles are continuously improved, the volume and the power density required by the electric drive system are also higher and higher, and the research and development personnel pay attention to how to design a more efficient and economical motor cooling method to further release the output performance of the motor. Among them, the cooling technology for the rotor assembly in the motor apparatus is particularly important.

The prior cooling technology mainly cools the iron core of the rotor through cooling liquid, and the iron core of the rotor is used for cooling the magnetic steel, so that the cooling mode cannot directly cool the magnetic steel, the cooling efficiency of the magnetic steel is low, uneven cooling is easily caused, a heat island phenomenon is generated, and the irreversible demagnetization risk of the magnetic steel can be increased. In order to reduce the demagnetizing risk of the magnetic steel, the prior art often needs to reduce the temperature control threshold value of the motor, so that the actual output performance of the motor cannot be fully exerted, and intangible economic loss can be generated.

Disclosure of Invention

The application provides a rotor subassembly and motor can improve cooling efficiency and cooling homogeneity, reduces the magnet steel and takes place the risk of demagnetizing, improves the actual output performance of motor, reduces economic loss.

In order to solve the technical problems, the application provides a rotor assembly, which comprises a rotating shaft and a rotor, wherein the rotating shaft is provided with a first runner; the rotor comprises an iron core and magnetic steel arranged in the iron core, the iron core further comprises a second runner communicated with the first runner, and the second runner at least partially takes the outer surface of the magnetic steel as a side wall.

Wherein the rotor assembly further comprises: the end plate is positioned at the end part of the rotor and is provided with a third flow passage which is respectively communicated with the first flow passage and the second flow passage.

The third flow channel comprises a first sub flow channel and a second sub flow channel, the rotor assembly comprises two end plates which are respectively arranged at two ends of the rotor, one end plate is provided with the first sub flow channel, the first sub flow channel is respectively communicated with an outlet of the first flow channel and an inlet of the second flow channel, the other end plate is provided with the second sub flow channel, and the second sub flow channel is respectively communicated with an outlet of the second flow channel and an external space.

The end plate is provided with a first sub-runner and a second sub-runner.

The first sub-flow channel comprises a first flow guiding part and a second flow guiding part communicated with the first flow guiding part, the rotor comprises two magnetic steels arranged at intervals, the first flow guiding part is also communicated with the first flow channel and a second flow channel corresponding to one magnetic steel respectively, and the second flow guiding part is also communicated with a second flow channel corresponding to the other magnetic steel.

The second sub-flow channel comprises a third flow guiding part and a fourth flow guiding part communicated with the third flow guiding part, the rotor comprises two magnetic steels arranged at intervals, the third flow guiding part is communicated with a second flow channel corresponding to one magnetic steel, and the fourth flow guiding part is communicated with a second flow channel corresponding to the other magnetic steel and an external space respectively.

The first sub-flow channel comprises a first flow guiding part and a second flow guiding part communicated with the first flow guiding part, the rotor comprises two magnetic steels which are arranged at intervals, the first flow guiding part is also communicated with the first flow channel and a second flow channel corresponding to one magnetic steel respectively, and the second flow guiding part is also communicated with a second flow channel corresponding to the other magnetic steel;

the second sub-flow channel comprises a third flow guiding part and a fourth flow guiding part communicated with the third flow guiding part, the third flow guiding part is also communicated with a second flow channel corresponding to one magnetic steel, and the fourth flow guiding part is also respectively communicated with a second flow channel corresponding to the other magnetic steel and an external space.

The first sub-flow channel comprises two groups of first flow guiding parts and second flow guiding parts, the two groups of first flow guiding parts are symmetrically arranged along the radial direction of the rotating shaft, the two groups of first flow guiding parts are communicated along the circumferential direction of the rotating shaft, the two groups of second flow guiding parts are communicated along the circumferential direction, and the joint of the two second flow guiding parts is communicated with the same second flow channel.

The second sub-flow channel comprises two groups of third flow guiding parts and fourth flow guiding parts, the two groups of third flow guiding parts are symmetrically arranged along the radial direction of the rotating shaft, the two groups of third flow guiding parts are communicated along the circumferential direction of the rotating shaft, and the joint of the two third flow guiding parts is communicated with the same second flow channel.

In order to solve the technical problem, the application also provides a motor which comprises the rotor assembly.

The beneficial effects of this application are: the rotor assembly comprises a rotating shaft and a rotor, wherein the rotating shaft is provided with a first runner; the rotor comprises an iron core and magnetic steel arranged in the iron core, the iron core further comprises a second runner communicated with the first runner, and the second runner at least partially takes the outer surface of the magnetic steel as a side wall. This application sets up the second runner in the iron core, and the surface that the second runner at least partly used the magnet steel is the lateral wall, and this kind of design mode can make the coolant liquid can be through second runner direct cooling magnet steel when the iron core of cooling rotor, and then can improve the cooling efficiency to the magnet steel, improves the cooling homogeneity of rotor, reduces the probability that the heat island phenomenon appears, and then reduces the magnet steel and take place the risk of demagnetizing to can improve the actual output performance of motor, reduce economic loss. Therefore, the cooling efficiency and the cooling uniformity can be improved, the risk of demagnetizing the magnetic steel is reduced, the actual output performance of the motor is improved, and the economic loss is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

FIG. 1 is a schematic cross-sectional view of an embodiment of a rotor assembly of the present application;

FIG. 2 is another cross-sectional schematic view of an embodiment of a rotor assembly of the present application;

FIG. 3 is a schematic cross-sectional view of an embodiment of an end plate in a rotor assembly of the present application;

FIG. 4 is a schematic cross-sectional view of another embodiment of an end plate in a rotor assembly of the present application;

FIG. 5 is a schematic cross-sectional view of yet another embodiment of an end plate in a rotor assembly of the present application;

FIG. 6 is a schematic cross-sectional view of yet another embodiment of a rotor assembly of the present application;

FIG. 7 is a schematic cross-sectional view of yet another embodiment of an end plate in a rotor assembly of the present application;

FIG. 8 is a schematic cross-sectional view of yet another embodiment of an end plate in a rotor assembly of the present application;

FIG. 9 is a schematic cross-sectional view of yet another embodiment of an end plate in a rotor assembly of the present application;

FIG. 10 is a schematic cross-sectional view of yet another embodiment of a rotor assembly of the present application;

FIG. 11 is a schematic cross-sectional view of yet another embodiment of an end plate in a rotor assembly of the present application;

FIG. 12 is a schematic cross-sectional view of yet another embodiment of a rotor assembly of the present application;

fig. 13 is a schematic structural view of a further embodiment of the rotor assembly of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The terms "first," "second," and the like in this application are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

It should be noted that when an element is fixed to another element, it includes directly fixing the element to the other element or fixing the element to the other element through at least one other element located therebetween. When one element is connected to another element, it includes directly connecting the element to the other element or connecting the element to the other element through at least one intervening other element.

First, a rotor assembly is proposed, as shown in fig. 1 and 2, fig. 1 is a schematic cross-sectional view of an embodiment of the rotor assembly of the present application; FIG. 2 is another cross-sectional schematic view of an embodiment of a rotor assembly of the present application. The rotor assembly of the present embodiment includes a rotating shaft 10 and a rotor 11, wherein the rotating shaft 10 is provided with a first flow channel 101; the rotor 11 comprises an iron core 12 and magnetic steel 13 arranged in the iron core 12, the iron core 12 also comprises a second runner 14 communicated with the first runner 101, and the second runner 14 at least partially takes the outer surface of the magnetic steel 13 as a side wall.

Specifically, in an application scenario, as shown in fig. 1, the rotor assembly may include one or more magnetic steels 13, where the magnetic steels 13 are distributed inside the iron core 12, and one or more cooling channels, that is, the second flow channels 14, are disposed around the magnetic steels 13. The rotor 11 is a high-speed rotating member, and under the action of high-speed centrifugal force of the rotor 11, as shown in fig. 2, the cooling liquid can flow into the second flow channel 14 through the first flow channel 101 in the rotating shaft 10, the cooling liquid flows through the second flow channel 14 to cool the iron core 12 and the magnetic steel 13, and is led out through the other end of the second flow channel 14. The iron core 12 of the rotor may include a plurality of second flow channels 14, and the second flow channels 14 directly use the outer surface of the magnetic steel 13 as a part of side walls, so that the magnetic steel 13 can be directly cooled while the iron core 12 is cooled.

The rotor assembly provided by the embodiment comprises a rotating shaft 10 and a rotor 11, wherein the rotating shaft 10 is provided with a first flow channel 101; the rotor 11 comprises an iron core 12 and magnetic steel 13 arranged in the iron core 12, the iron core 12 also comprises a second runner 14 communicated with the first runner 101, and the second runner 14 at least partially takes the outer surface of the magnetic steel 13 as a side wall. According to the embodiment, the second flow channel 14 is arranged in the iron core 12, and the second flow channel 14 at least partially uses the outer surface of the magnetic steel 13 as the side wall, so that the cooling liquid can directly cool the magnetic steel 13 through the second flow channel 14 when cooling the iron core 12 of the rotor, the cooling efficiency of the magnetic steel 13 can be improved, the cooling uniformity of the rotor 11 is improved, the occurrence probability of a heat island phenomenon is reduced, the demagnetizing risk of the magnetic steel 13 is further reduced, the power density of a motor can be improved, the maximum output potential of the motor is excavated, the actual output performance of the motor is improved, and the economic loss is reduced. Therefore, the embodiment can improve the cooling efficiency and the cooling uniformity, reduce the risk of demagnetizing the magnetic steel 13, improve the actual output performance of the motor and reduce the economic loss.

Alternatively, the magnetic steel 13 and the corresponding second flow channels 14 may be uniformly distributed inside the core 12, which helps to improve the uniform distribution of the cooling liquid inside the core 12 of the rotor, thereby improving the cooling uniformity.

In other embodiments, the number and positions of each magnetic steel and the corresponding second flow channel 14 are not limited, and only the cooling liquid can directly contact the magnetic steel through the second flow channel 14.

The present application further proposes a rotor assembly, as shown in fig. 3 and 4, fig. 3 is a schematic cross-sectional view of an embodiment of an end plate in the rotor assembly of the present application; fig. 4 is a schematic cross-sectional view of another embodiment of an end plate in a rotor assembly of the present application. In addition to the above embodiments, the rotor assembly of the present embodiment further includes an end plate 15 located at an end of the rotor 11 and provided with third flow passages 16 respectively communicating with the first flow passage 101 and the second flow passage 14 (refer to fig. 1).

Specifically, in an application scenario, as shown in fig. 3, under the action of the high-speed centrifugal force of the rotor 11, the rotor 11 guides the cooling liquid through the third flow channels 16 on the end plate 15, and flows the cooling liquid from the first flow channels 101 into the one or more second flow channels 14.

The third flow channel 16 in the end plate 15 is arranged to guide the cooling liquid from the first flow channel 101 to the second flow channel 14, so that the flow channel structure can be simplified, the flow uniformity of the cooling liquid flowing into the plurality of second flow channels 14 is improved, the uniformity of the cooling effect is improved, the cooling efficiency is improved, and the occurrence probability of a heat island phenomenon is reduced.

Alternatively, the first flow channel 101 may enter the third flow channel 16 through the diversion holes on the rotating shaft 10, and the number and the positions of the diversion holes are not limited. Alternatively, 3 deflector holes may be provided, and the positions of the deflector holes may be staggered from the deflector direction of the third flow passage 16.

Optionally, the third flow channel 16 includes a first sub-flow channel 161 and a second sub-flow channel 162, the rotor assembly includes two end plates 15 respectively disposed at two ends of the rotor 11, one end plate 15 is provided with the first sub-flow channel 161, the first sub-flow channel 161 is respectively communicated with the outlet of the first flow channel 101 and the inlet of the second flow channel 14, the other end plate 15 is provided with the second sub-flow channel 162, and the second sub-flow channel 162 is respectively communicated with the outlet of the second flow channel 14 and the external space.

Specifically, in an application scenario, end plates 15 may be disposed at both ends of the rotor 11, as shown in fig. 3 and 4, one end plate 15 is provided with a first sub-flow channel 161, and the other end plate 15 is provided with a second sub-flow channel 162. Under the action of the high-speed centrifugal force of the rotor 11, the first sub-flow channel 161 is used for guiding the cooling liquid from the first flow channel 101 into one or more second flow channels 14, the cooling liquid flows through the second flow channels 14 to directly cool the magnetic steel (simultaneously cool the iron core 12), then flows into the second sub-flow channels 162 through the outlet ends of the second flow channels 14, and the second sub-flow channels 162 guide the cooling liquid flowing out of the one or more second flow channels 14 to the external space.

By the arrangement of the third flow channel 16 into the first sub-flow channel 161 and the second sub-flow channel 162, when the plurality of second flow channels 14 are designed, the first sub-flow channel 161 is more convenient for guiding the cooling liquid into the plurality of second flow channels 14 more uniformly, the second sub-flow channel 162 is more convenient for carrying out concentrated guiding treatment on the cooling liquid led out of the second flow channels 14, the treatment convenience of the cooling liquid flowing out of the rotor 11 is improved, and the flow channel structure is simplified.

Alternatively, the external space and the second sub flow channel 162 may be connected through the dump hole 17, and the number and position of the dump hole 17 are not limited.

Optionally, the cooling fluid may further cool the motor stator coil after exiting through the dump hole 17.

In another embodiment, as shown in fig. 5, the end plate 15 is provided with a first sub-flow channel 161 and a second sub-flow channel 162.

Specifically, in an application scenario, the two ends of the rotor 11 are both provided with end plates 15, each side of the end plates 15 is provided with a first sub-runner 161 and a second sub-runner 162, and the first sub-runner 161 and the second sub-runner 162 on the same end plate 15 do not interfere with each other, which is done by each other. The first sub-flow channel 161 is responsible for opening the first flow channel 101 and the corresponding second flow channel 14, and the second sub-flow channel 162 is responsible for opening the corresponding second flow channel 14 and the external space, so each second flow channel 14 is provided with the corresponding first sub-flow channel 161 and the corresponding second sub-flow channel 162, and ensures the inlet and outlet of the cooling liquid. Therefore, under the action of the high-speed centrifugal force of the rotor 11, each side end plate 15 can guide the cooling liquid from the first flow passage 101 to the second flow passage 14 (see fig. 1) in the iron core 12 (see fig. 1) of the rotor and guide the cooling liquid guided out of the second flow passage 14 to the external space. Specifically, namely: each side end plate 15 can guide the cooling liquid in the first flow channel 101 to the second flow channel 14 through the first sub-flow channel 161 on the end plate 15, and then the cooling liquid flows to the second sub-flow channel 162 of the other side end plate 15 and then flows out to the external space; the cooling liquid flowing from the first sub-flow channel 161 of the other end plate 15 into the second flow channel 14 and flowing out to the second sub-flow channel 162 of the other end plate 15 can be received and guided out to the external space.

In a practical scenario, since the cooling fluid exchanges heat with the inflow end, the cooling fluid continuously exchanges heat with the flow of the cooling fluid in the second flow channel 14, so that the temperature of the cooling fluid gradually increases, which may cause inconsistent cooling efficiency between the inflow end and the outflow end of the cooling fluid in the core 12 of the rotor. Through this kind of setting method of the embodiment shown in fig. 5, under the effect of rotor 11 high-speed centrifugal force, can make the coolant liquid in the rotor 11 have two relative flow direction, and this embodiment this kind of mode can alleviate the inconsistent problem of inflow end outflow end cooling efficiency, further improves the cooling homogeneity and the cooling efficiency of magnet steel and iron core 12, and can compatible positive and negative rotation operating mode simultaneously, and then further improves rotor 11's cooling homogeneity and cooling efficiency.

Optionally, one or more second flow passages 14 corresponding to each magnetic steel may share a set of first sub-flow passages 161 and corresponding second sub-flow passages 162.

The present application further proposes a rotor assembly, as shown in fig. 6 and 8, fig. 6 is a schematic cross-sectional view of a further embodiment of the rotor assembly of the present application; FIG. 7 is a schematic cross-sectional view of yet another embodiment of an end plate in a rotor assembly of the present application; fig. 8 is a schematic cross-sectional view of yet another embodiment of an end plate in a rotor assembly of the present application. On the basis of the embodiment shown in fig. 3, the rotor assembly of this embodiment further includes: the first sub-runner 161 comprises a first flow guiding part 21 and a second flow guiding part 22 communicated with the first flow guiding part 21, the rotor 11 comprises two magnetic steels 13 arranged at intervals, the first flow guiding part 21 is also communicated with the first runner 101 and a second runner 14 corresponding to one magnetic steel 13 respectively, and the second flow guiding part 22 is also communicated with the second runner 14 corresponding to the other magnetic steel 13.

Specifically, in an application scenario, the iron core 12 of the rotor includes two magnetic steels 13 disposed at intervals, the two magnetic steels 13 correspond to a first sub-runner 161, wherein a first flow guiding portion 21 of the first sub-runner 161 is communicated with the first runner 101 and a second runner 14 corresponding to the magnetic steel 13, and is responsible for guiding the cooling liquid in the first runner 101 into the corresponding second runner 14; the second flow guiding part 22 of the first sub-flow channel 161 is communicated with the first flow guiding part 21 and the second flow channel 14 corresponding to the other magnetic steel 13, and is responsible for guiding part of the cooling liquid in the first flow guiding part 21 into the second flow channel 14 corresponding to the other magnetic steel 13.

In this way, the adjacent magnetic steels 13 can share the first sub-runner 161, so that the runner design in the rotor 11 is simplified, and the cost is reduced.

Alternatively, the two magnetic steels 13 arranged at intervals may be arranged in an "L" shape or an "L-like shape, and extend from the vicinity of the rotating shaft 10 to the periphery of the rotor 11, and the arrangement manner of the two corresponding second flow passages 14 around the two magnetic steels may enable the cooling liquid to cool not only the portion of the rotor 11 close to the rotating shaft 10 but also the periphery of the rotor 11 far from the rotating shaft 10, so as to improve the cooling uniformity and cooling efficiency of the rotor 11.

Alternatively, the iron core 12 of the rotor may include a plurality of sets of two magnetic steels 13 disposed at intervals, and the specific arrangement manner may be uniformly arranged inside the iron core 12 of the rotor.

In other embodiments, the number of sets of two spaced apart sets of magnetic steels 13 in the core of the rotor is not limited.

In other embodiments, the positional relationship of the two magnetic steels 13 disposed at intervals is not limited, and it is only required that the plurality of second flow passages corresponding to the two magnetic steels 13 can share one corresponding first sub-flow passage.

Optionally, as shown in fig. 8, on the basis of the embodiment shown in fig. 4, the rotor assembly of the present embodiment further includes: the second sub-flow channel 162 includes a third flow guiding portion 31 and a fourth flow guiding portion 32 that is communicated with the third flow guiding portion 31, the rotor 11 includes two magnetic steels 13 that are arranged at intervals, the third flow guiding portion 31 is further communicated with a second flow channel 14 (refer to fig. 6) corresponding to one magnetic steel 13, and the fourth flow guiding portion 32 is further respectively communicated with the second flow channel 14 and an external space corresponding to another magnetic steel 13.

Specifically, in an application scenario, the iron core 12 of the rotor includes two magnetic steels 13 disposed at intervals, the two magnetic steels 13 correspond to a second sub-runner 162, wherein the third flow guiding portion 31 of the second sub-runner 162 is communicated with the fourth flow guiding portion 32 and the second runner 14 corresponding to the magnetic steel 13, and is responsible for guiding the cooling liquid in the second runner 14 into the external space; the fourth guiding part 32 of the second sub-runner 162 is communicated with the external space and the second runner 14 corresponding to the other magnetic steel 13, and is responsible for guiding the cooling liquid in the second runner 14 into the external space.

In this way, the adjacent magnetic steels 13 can share the second sub-runner 162, so that the runner design in the rotor 11 is simplified, and the cost is reduced.

Alternatively, the external space and the second sub-flow channel 162 may be connected through the flow-throwing hole 17, and the position of the flow-throwing hole 17 may be set at the communication position of the third flow-guiding portion 31 and the fourth flow-guiding portion 32, or may be set at another position, so that the third flow-guiding portion 31 and the fourth flow-guiding portion 32 may be communicated with the external space.

In other embodiments, similar modifications may be made to other illustrated embodiments described herein, and will not be described in detail herein.

The present application further contemplates a rotor assembly, as shown in fig. 9, with fig. 9 being a schematic cross-sectional view of yet another embodiment of an end plate in a rotor assembly of the present application. In the rotor assembly of the present embodiment, the end plate 15 is provided with a first sub-runner 161 and a second sub-runner 162, that is, the present embodiment further includes, based on the embodiment shown in fig. 5: the first sub-flow channel 161 comprises a first flow guiding portion 21 and a second flow guiding portion 22 communicated with the first flow guiding portion 21, the rotor 11 (refer to fig. 6) comprises two magnetic steels 13 (refer to fig. 6) which are arranged at intervals, the first flow guiding portion 21 is respectively communicated with the first flow channel 101 and a second flow channel 14 (refer to fig. 6) corresponding to one magnetic steel 13, and the second flow guiding portion 22 is also communicated with a second flow channel 14 corresponding to the other magnetic steel 13; the second sub-flow channel 162 includes a third flow guiding portion 31 and a fourth flow guiding portion 32 that is communicated with the third flow guiding portion 31, the third flow guiding portion 31 is further communicated with the second flow channel 14 corresponding to one magnetic steel 13, and the fourth flow guiding portion 32 is further respectively communicated with the second flow channel 14 corresponding to the other magnetic steel 13 and an external space.

Specifically, in an application scenario, the two ends of the rotor 11 are both provided with end plates 15, each side of the end plates 15 is provided with a first sub-runner 161 and a second sub-runner 162, and the first sub-runner 161 and the second sub-runner 162 on the same end plate 15 do not interfere with each other, which is done by each other. The first sub-flow channel 161 is responsible for opening the first flow channel 101 and the corresponding second flow channel 14, and the second sub-flow channel 162 is responsible for opening the corresponding second flow channel 14 and the external space, so each second flow channel 14 is provided with the corresponding first sub-flow channel 161 and the corresponding second sub-flow channel 162, and ensures the inlet and outlet of the cooling liquid. Therefore, under the action of the high-speed centrifugal force of the rotor 11, each side end plate 15 can guide the cooling liquid from the first runner 101 into the iron core 12 of the rotor and guide the cooling liquid guided out from the iron core 12 of the rotor to the external space. Specifically, namely: each side end plate 15 can guide the cooling liquid in the first flow channel 101 to the second flow channel 14 through the first sub-flow channel 161 on the end plate 15, and then the cooling liquid flows to the second sub-flow channel 162 of the other side end plate 15 and then flows out to the external space; the cooling liquid flowing from the first sub-flow channel 161 of the other end plate 15 into the second flow channel 14 and flowing out to the second sub-flow channel 162 of the other end plate 15 can be received and guided out to the external space.

Meanwhile, in the present embodiment, each first sub-runner 161 corresponds to two magnetic steels 13 disposed at adjacent intervals, each second sub-runner 162 corresponds to two magnetic steels 13 disposed at adjacent intervals, the first flow guiding portion 21 and the second flow guiding portion 22 are responsible for guiding the cooling liquid for the corresponding second runner 14 corresponding to the magnetic steel 13, and the third flow guiding portion 31 and the fourth flow guiding portion 32 are responsible for guiding the cooling liquid in the corresponding second runner 14 corresponding to the magnetic steel 13 to the external space.

In this way, two adjacent magnetic steels 13 arranged at intervals can share the first sub-runner 161 and the second sub-runner 162, so that the runner structure can be simplified, and the cost can be reduced; and further, through the mode, the cooling liquid in the rotor 11 can have two opposite flowing directions under the action of the high-speed centrifugal force of the rotor 11, as the cooling liquid can exchange heat with the inflow end firstly, the temperature of the cooling liquid is gradually increased along with the flowing of the cooling liquid in the second flow channel 14, the cooling efficiency of the inflow end and the outflow end of the cooling liquid in the iron core 12 of the rotor is not consistent, the problem can be improved due to the design of the opposite flowing directions, the problem that the cooling efficiency of the outflow end of the inflow end is not consistent is relieved, the cooling uniformity and the cooling efficiency of the magnetic steel 13 and the iron core 12 are further improved, and the cooling uniformity and the cooling efficiency of the rotor 11 can be further improved due to the fact that the cooling liquid is compatible with the forward and reverse working conditions.

Alternatively, the two magnetic steels 13 arranged at intervals may be arranged in an "L" shape or an "L-like shape, and extend from the vicinity of the rotating shaft 10 to the periphery of the rotor 11, and the arrangement manner of the two corresponding second flow passages 14 around the two magnetic steels may enable the cooling liquid to cool not only the portion of the rotor 11 close to the rotating shaft 10 but also the periphery of the rotor 11 far from the rotating shaft 10, so as to improve the cooling uniformity and cooling efficiency of the rotor 11.

Alternatively, the external space and the second sub-flow channel 162 may be connected through the flow-throwing hole 17, and the position of the flow-throwing hole 17 may be set at the communication position of the third flow-guiding portion 31 and the fourth flow-guiding portion 32, or may be set at another position, so that the third flow-guiding portion 31 and the fourth flow-guiding portion 32 may be communicated with the external space.

The present application further proposes a rotor assembly, as shown in fig. 10 to 13, fig. 10 being a schematic cross-sectional view of a further embodiment of the rotor assembly of the present application; FIG. 11 is a schematic cross-sectional view of yet another embodiment of an end plate in a rotor assembly of the present application; FIG. 12 is a schematic cross-sectional view of yet another embodiment of a rotor assembly of the present application; fig. 13 is a schematic structural view of a further embodiment of the rotor assembly of the present application. On the basis of the embodiments shown in fig. 6 and 7, the rotor assembly of the present embodiment further includes: the first sub-flow channel 161 includes two groups of first flow guiding portions 21 and second flow guiding portions 22, and is symmetrically arranged along the radial direction of the rotating shaft 10, wherein the two first flow guiding portions 21 in the two groups are communicated along the circumferential direction of the rotating shaft 10, the two second flow guiding portions 22 in the two groups are communicated along the circumferential direction, and the connection positions of the two second flow guiding portions 22 are communicated with the same second flow channel 14.

Specifically, in an application scenario, as shown in fig. 10, the iron core 12 of the rotor includes two sets of two magnetic steels arranged at intervals, and the two sets of magnetic steels are symmetrically arranged along the radial direction of the rotating shaft 10, wherein, among the two magnetic steels arranged at intervals corresponding to each set of magnetic steels, one end of a magnetic steel 41 is close to the axis of the rotating shaft 10, the other end is far from the axis, and the magnetic steel 41 extends along the radial direction of the rotating shaft 10; the other magnetic steel 42 and the magnetic steel 41 are arranged at a certain included angle interval on one side of the iron core 12 of the rotor, which is far away from the rotating shaft 10, one end of the magnetic steel 42 is close to the magnetic steel 41, and the other end is far away from the magnetic steel 41 and is close to the radial symmetry axes of the two groups of magnetic steels.

Further, as shown in fig. 10, the second flow channel 14 corresponding to the magnetic steel 41 is disposed on one side of the magnetic steel 41 close to the rotating shaft 10 and one side far from the rotating shaft 10; the second flow channel 14 corresponding to the magnetic steel 42 is arranged on one side of the magnetic steel 42 close to the magnetic steel 41 and one side far away from the magnetic steel 41 and close to the radial symmetry axes of the two groups of magnetic steels.

Further, as shown in fig. 11, in the end plate 15 of the rotor, the first sub-flow channel 161 further includes two sets of first flow guiding portions 21 and second flow guiding portions 22, and the two sets of first flow guiding portions 21 and second flow guiding portions 22 are symmetrically arranged along the radial direction of the rotating shaft 10, and each set of first flow guiding portions 21 and second flow guiding portions 22 is correspondingly arranged with a magnetic steel set. The two first flow guiding portions 21 in the two groups are in a communication state in the circumferential direction of the rotary shaft 10, and the two second flow guiding portions 22 in the two groups are in a communication state in the circumferential direction. Because the two sets of magnetic steels are symmetrically arranged along the radial direction of the rotating shaft 10, the second flow channels 14 corresponding to the two magnetic steels 42 and close to one side of the radial symmetry axes of the two sets of magnetic steels can share the second flow guiding part 22, i.e. the connection part of the two second flow guiding parts 22 is communicated with the same second flow channel 14.

Specifically, under the action of the high-speed centrifugal force of the rotor 11, the cooling liquid enters the first flow passage 101, flows into the corresponding second flow passage 14 through the two first flow guiding portions 21 in the first sub-flow passage 161, and flows into the corresponding two second flow guiding portions 22 through the two first flow guiding portions 21, and the cooling liquid flowing into the corresponding second flow guiding portions 22 further flows into the corresponding second flow passage 14 of the second flow guiding portions 22.

Through this kind of design mode, two first water conservancy diversion portions 21 in two sets of are along the circumference intercommunication of pivot 10, and two second water conservancy diversion portions 22 in two sets of are along circumference intercommunication, and the junction and the same second runner 14 intercommunication of two second water conservancy diversion portions 22 can further simplify the runner structure for a first sub-runner 161 can correspond the second runner 14 that two sets of magnet steel correspond, and each first sub-runner 161 can be for multiunit magnet steel water conservancy diversion coolant liquid entering its second runner 14 that corresponds promptly, can improve cooling efficiency, reduce cost.

Optionally, as shown in fig. 12, the rotor assembly further includes a flow guide pipe 18, the cooling liquid first enters the first flow channel 101 through a flow guide hole provided on the flow guide pipe under the action of the high-speed centrifugal force of the rotor 11, and is uniformly thrown onto the inner wall of the rotating shaft, and then enters the first sub-flow channel 161 provided on the end plate of the rotor through the flow guide hole provided on the inner wall of the rotating shaft.

Optionally, the iron core 12 of the rotor may include 3 two sets of two magnetic steels disposed at intervals and corresponding second flow passages 14 disposed symmetrically, and 3 two sets of two magnetic steels disposed at intervals and corresponding second flow passages 14 disposed symmetrically may be uniformly distributed inside the iron core 12 and be uniformly distributed near all the magnetic steels, so as to improve the uniform distribution, cooling uniformity and cooling efficiency of the cooling liquid in the rotor 11.

Alternatively, as shown in fig. 11, the end plate 15 of the rotor may correspondingly include 3 first sub-flow passages 161,3, and the first sub-flow passages 161 may correspondingly and uniformly be distributed on the end plate, so as to more uniformly enter the core 12, reduce the phenomenon that the cooling liquid is biased to one side due to the centrifugal force of high-speed rotation, and further improve the uniform distribution, cooling uniformity and cooling efficiency of the cooling liquid of the rotor 11.

Optionally, the second sub-flow channel 162 includes two groups of third flow guiding portions 31 and fourth flow guiding portions 32, and are symmetrically arranged along the radial direction of the rotating shaft 10, two third flow guiding portions 31 in the two groups are communicated along the circumferential direction of the rotating shaft 10, and the connection parts of the two third flow guiding portions 31 are communicated with the same second flow channel 14.

Specifically, as shown in fig. 10 to 11, in the end plate 15 of the rotor shown in fig. 11, the second sub-flow channel 162 further includes two sets of third flow guiding portions 31 and fourth flow guiding portions 32, and the two sets of third flow guiding portions 31 and fourth flow guiding portions 32 are symmetrically arranged along the radial direction of the rotating shaft 10, and each set of third flow guiding portions 31 and fourth flow guiding portions 32 is correspondingly arranged with a magnetic steel set. The two third flow guiding portions 31 in the two groups are in a communicating state in the circumferential direction of the rotary shaft 10. Since the two sets of magnetic steels in the iron core 12 of the rotor shown in fig. 10 are symmetrically arranged along the radial direction of the rotating shaft 10, the second flow channels 14 corresponding to the two magnetic steels 42 and close to the radial symmetry axes of the two sets of magnetic steels may share the third flow guiding portion 31, that is, the connection position of the two third flow guiding portions 31 is communicated with the same second flow channel 14.

Specifically, as shown in fig. 10 to 13, under the high-speed centrifugal force of the rotor 11, the cooling liquid flows into the corresponding second flow passage 14 through the third flow passage 16, flows into the corresponding third flow guide portion 31 or fourth flow guide portion 32 through the corresponding second flow passage 14, the cooling liquid flowing into the third flow guide portion 31 flows out of the external space through the fourth flow guide portion 32, and the cooling liquid flowing into the fourth flow guide portion 32 flows out of the external space through the fourth flow guide portion 32.

Through also setting up two sets of third water conservancy diversion portions 31 and fourth water conservancy diversion portion 32 with second sub-runner 162 corresponding two sets of magnet steel, can further simplify the runner structure for a second sub-runner 162 can correspond the second runner 14 that two sets of magnet steel correspond, and every second sub-runner 162 can be multiunit magnet steel water conservancy diversion coolant liquid to the external space, can simplify the runner structure, reduce cost.

Optionally, a dump hole 17 may be provided at a communication place of each third flow guiding portion 31 and the fourth flow guiding portion 32 for guiding the cooling liquid to the external space.

Alternatively, as shown in fig. 11, each of the end plates 15 of the rotors may include both 3 first sub-flow passages 161 and 3 second sub-flow passages 162. The first sub-flow passages 161 are uniformly distributed in the core 12 of the rotor, the second sub-flow passages 162 are uniformly distributed in the core 12 of the rotor, and the first sub-flow passages 161 and the second sub-flow passages 162 are arranged to intersect. As shown in fig. 12 and 13, the design manner can make the cooling liquid in the rotor 11 have two opposite flowing directions, and the two opposite flowing directions are uniformly distributed in the iron core 12 of the rotor, so that the problem of inconsistent cooling efficiency of the flowing-in end and the flowing-out end of the cooling liquid in the iron core 12 can be further relieved under the action of the high-speed centrifugal force of the rotor 11; further, the first sub-flow channels 161 and the second sub-flow channels 162 which are uniformly and crosswise distributed can improve the distribution uniformity of the cooling liquid in the iron core 12, further improve the cooling uniformity and the cooling efficiency of the magnetic steel and the iron core 12, and further improve the cooling uniformity and the cooling efficiency of the rotor 11.

In other embodiments, the number and distribution of the first sub-flow channels and the second sub-flow channels are not limited, and the cooling liquid may be introduced into the second flow channels.

In other embodiments, at the junction of the two second flow guiding portions, the second flow channels corresponding to the two magnetic steels may be combined into one second flow channel.

In other embodiments, the second flow channel corresponding to the magnetic steel may also be disposed at other outer surface positions corresponding to the magnetic steel.

The application further proposes an electric machine comprising a rotor assembly as described above.

In prior art, this application sets up the second runner in the iron core, and the surface that the second runner at least partly used the magnet steel is the lateral wall, and this kind of design mode can make the coolant liquid can be through second runner direct cooling magnet steel when the iron core of cooling rotor, and then can improve the cooling efficiency to the magnet steel, improves the cooling homogeneity of rotor, reduces the probability that the heat island phenomenon appears, and then reduces the magnet steel and take place the risk of demagnetizing to can improve the actual output performance of motor, reduce economic loss. Therefore, the cooling efficiency and the cooling uniformity can be improved, the risk of demagnetizing the magnetic steel is reduced, the actual output performance of the motor is improved, and the economic loss is reduced.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims (10)

1. A rotor assembly, comprising:

the rotating shaft is provided with a first runner;

the rotor comprises an iron core and magnetic steel arranged in the iron core, wherein the iron core further comprises a second flow passage communicated with the first flow passage, and at least part of the second flow passage takes the outer surface of the magnetic steel as a side wall.

2. The rotor assembly of claim 1, wherein the rotor assembly further comprises:

and the end plate is positioned at the end part of the rotor and is provided with a third flow passage which is respectively communicated with the first flow passage and the second flow passage.

3. The rotor assembly of claim 2 wherein the third flow passage comprises a first sub-flow passage and a second sub-flow passage, the rotor assembly comprising two end plates disposed at opposite ends of the rotor, respectively, one end plate having the first sub-flow passage, the first sub-flow passage communicating with an outlet of the first flow passage and an inlet of the second flow passage, respectively, and the other end plate having the second sub-flow passage, the second sub-flow passage communicating with an outlet of the second flow passage and an external space, respectively.

4. A rotor assembly as claimed in claim 3, wherein the end plate is provided with the first and second sub-flow passages.

5. A rotor assembly according to claim 3, wherein the first sub-runner comprises a first flow guiding portion and a second flow guiding portion communicated with the first flow guiding portion, the rotor comprises two magnetic steels arranged at intervals, the first flow guiding portion is further communicated with the first runner and a second runner corresponding to one magnetic steel respectively, and the second flow guiding portion is further communicated with a second runner corresponding to another magnetic steel.

6. A rotor assembly according to claim 3, wherein the second sub-runner comprises a third flow guiding portion and a fourth flow guiding portion communicated with the third flow guiding portion, the rotor comprises two magnetic steels arranged at intervals, the third flow guiding portion is further communicated with a second runner corresponding to one magnetic steel, and the fourth flow guiding portion is further respectively communicated with a second runner corresponding to the other magnetic steel and an external space.

7. The rotor assembly of claim 4 wherein the first sub-runner comprises a first flow guiding portion and a second flow guiding portion in communication with the first flow guiding portion, the rotor comprises two spaced apart magnetic steels, the first flow guiding portion is in communication with the first runner and a second runner corresponding to one of the magnetic steels, respectively, and the second flow guiding portion is in communication with a second runner corresponding to the other of the magnetic steels;

the second sub-flow channel comprises a third flow guiding part and a fourth flow guiding part communicated with the third flow guiding part, the third flow guiding part is also communicated with a second flow channel corresponding to one magnetic steel, and the fourth flow guiding part is also respectively communicated with a second flow channel corresponding to the other magnetic steel and an external space.

8. The rotor assembly of claim 5 wherein the first sub-flow passage comprises two sets of the first flow guiding portions and the second flow guiding portions, and the two sets of the first flow guiding portions are symmetrically arranged along the radial direction of the rotating shaft, two of the two sets of the first flow guiding portions are communicated along the circumferential direction of the rotating shaft, two of the two sets of the second flow guiding portions are communicated along the circumferential direction, and the joint of the two second flow guiding portions is communicated with the same second flow passage.

9. The rotor assembly of claim 6 wherein the second sub-flow passage includes two sets of the third flow guiding portions and the fourth flow guiding portions, and the third flow guiding portions are symmetrically arranged along a radial direction of the rotating shaft, two of the two sets of the third flow guiding portions are communicated along a circumferential direction of the rotating shaft, and a junction of the two third flow guiding portions is communicated with the same second flow passage.

10. An electric machine comprising a rotor assembly according to any one of claims 1-9.