CN116247847A - Rotor assembly and motor - Google Patents

Rotor assembly and motor Download PDF

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Publication number
CN116247847A
CN116247847A CN202211103929.8A CN202211103929A CN116247847A CN 116247847 A CN116247847 A CN 116247847A CN 202211103929 A CN202211103929 A CN 202211103929A CN 116247847 A CN116247847 A CN 116247847A
Authority
CN
China
Prior art keywords
communication
end plate
channel
cooling channel
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211103929.8A
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Chinese (zh)
Inventor
贺伟
唐铃虹
卢有君
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Changan New Energy Automobile Technology Co Ltd
Original Assignee
Chongqing Changan New Energy Automobile Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing Changan New Energy Automobile Technology Co Ltd filed Critical Chongqing Changan New Energy Automobile Technology Co Ltd
Priority to CN202211103929.8A priority Critical patent/CN116247847A/en
Publication of CN116247847A publication Critical patent/CN116247847A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Abstract

The invention discloses a rotor assembly for a motor and the motor with the same. The rotor assembly includes a first end plate, a second end plate, and a rotor core. Through set up cooling channel on rotor core, set up first UNICOM passageway on first end plate, set up the second UNICOM passageway on the second end plate, cooling channel cooperates with first UNICOM passageway and second UNICOM passageway, cools down rotor core. At least part of the projection of the first communication channel in the extending direction of the cooling channel is positioned at the radial inner side of the cooling channel; and/or at least part of the projection of the second communication channel in the extending direction of the cooling channel is positioned at the radial outer side of the cooling channel, a pressure difference is formed between the first end plate and the second end plate, air flow is formed in the cooling channel, and hot air in the cooling channel is carried out to cool the rotor core.

Description

Rotor assembly and motor
Technical Field
The invention relates to the field of motors, in particular to a rotor assembly and a motor with the same.
Background
In the related art, the temperature rise is too high in the running process of the motor, so that the motor aging is accelerated, and the functional safety of the motor is affected. At present, the motor mainly adopts a shell cooling flow channel to cool the stator, and the rotor end plate structure can assist in cooling the rotor.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the invention is to propose a rotor assembly for an electric machine. A rotor assembly according to the present invention includes a first end plate, a second end plate, and a rotor core. The first end plate and the second end plate are respectively assembled at two ends of the rotor core, the first communication channel, the cooling channel and the second communication channel form a cooling channel, air flow is formed inside the rotor core by utilizing the pressure difference and the centrifugal principle, hot air inside the rotor is discharged, and the rotor core is cooled.
The invention also provides a motor comprising the rotor assembly.
A rotor assembly according to the present invention includes a rotor core, a first end plate, and a second end plate. A cooling channel is formed in the rotor core; the first end plate is arranged at one end of the rotor core, a first communication channel is formed on the first end plate, and the first communication channel is communicated with the cooling channel; the second end plate is arranged at one end of the rotor core, a second communication channel is formed on the second end plate, and the second communication channel is communicated with the cooling channel; wherein at least part of the projection of the first communication channel in the extending direction of the cooling channel is positioned at the radial inner side of the cooling channel; and/or at least part of the projection of the second communication channel in the direction of extension of the cooling channel is located radially outside the cooling channel.
The first end plate, the rotor core and the second end plate rotating shaft are in interference fit, the first end plate and the second end plate are respectively coaxially fixed at two ends of the rotor core with the rotating shaft, and the first end plate and the second end plate are identical in structure. A cooling channel is formed in the rotor core, a first communication channel is formed on the first end plate, and the first communication channel is communicated with the cooling channel; the second end plate is provided with a second communication channel which is communicated with the cooling channel; the number of the cooling passages is twice the number of the first communication passages and the number of the second communication passages. The first communication channel, the cooling channel and the second communication channel form a cooling channel, wherein at least part of the projection of the first communication channel in the extending direction of the cooling channel is positioned at the radial inner side of the cooling channel; and/or at least part of the projection of the second communication channel on the extending direction of the cooling channel is positioned at the radial outer side of the cooling channel, so that the pressure intensity at the communication position of the first communication channel and the cooling channel is lower than that at the communication position of the second communication channel and the cooling channel, in the rotating process of the rotor, the two ends of the rotor core generate pressure difference, and then the cooling channel is internally provided with air flow, in the process of the air flow flowing through the cooling channel, hot air in the rotor core is discharged, the temperature of the rotor can be effectively reduced, and the first end plate, the rotor core and the second end plate are connected through interference fit, so that the assembly is simpler.
According to one embodiment of the invention, the inlet end of the second communication channel is open in the axial direction and communicates with the cooling channel, and the outlet end of the second communication channel is open in the radial direction.
According to one embodiment of the present invention, a side surface of the second end plate facing the rotor core is formed with a receiving groove recessed toward away from the rotor core, the receiving groove penetrating in a radial direction of the second end plate, an inner wall of the receiving groove defining the second communication passage.
According to one embodiment of the invention, the inner wall of the receiving groove comprises a bottom wall and an air guiding wall. The bottom wall is opposite to at least part of the cooling channel; the air guide wall is formed on at least part of the edge of the bottom wall, and the extending direction of the air guide wall is the same as that of the cooling channel.
According to one embodiment of the invention, the bottom wall comprises a first edge and a second edge, one end of the first edge is intersected with one end of the second edge, and the other end of the first edge and the other end of the second edge are arranged at intervals to define an air outlet of the second communication channel; the wind-guiding wall includes: the first wind guide wall and the second wind guide wall. The first air guide wall is arranged at the first edge and is perpendicular to the bottom wall; the second air guide wall is arranged at the second edge and is perpendicular to the bottom wall.
According to one embodiment of the invention, the angle α between the first edge and the second edge is α, and α satisfies: alpha is more than or equal to 45 degrees and less than or equal to 110 degrees.
According to an embodiment of the invention, the first wind guiding wall and the second wind guiding wall are configured as a plane or arc extending continuously in radial direction.
According to one embodiment of the invention, the first end plate is provided with a third communication channel communicated with the cooling channel, the second end plate is provided with a fourth communication channel communicated with the cooling channel, and at least part of the projection of the third communication channel in the extending direction of the cooling channel is positioned on the radial outer side of the cooling channel; and/or at least part of the projection of the fourth communication passage in the direction in which the cooling passage extends is located radially inward of the cooling passage.
According to an embodiment of the present invention, the first communication passage and the third communication passage are each configured in plural, and the plural first communication passages and the plural third communication passages are arranged at intervals in the circumferential direction; the second communication passage and the fourth communication passage are each configured in plural, and the plural second communication passages and the plural fourth communication passages are arranged at intervals in the circumferential direction.
The motor according to the present invention is briefly described below.
The motor according to the invention comprises a rotor assembly according to any of the embodiments described above. Since the motor according to the invention comprises the rotor assembly according to any one of the embodiments, the motor according to the invention has better cooling effect, longer service life and better safety.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a block diagram of a rotor assembly according to the present invention;
FIG. 2 is a cross-sectional view of a rotor assembly according to one embodiment of the invention;
fig. 3 is a structural view of a rotor core according to an embodiment of the present invention;
FIG. 4 is a block diagram of a first end plate and a second end plate according to one embodiment of the invention;
FIG. 5 is a block diagram of a rotor assembly according to one embodiment of the invention.
Reference numerals:
a rotor assembly 1;
a rotor core 11 and a cooling passage 111;
the first end plate 12, the first communication passage 121, the third communication passage 122;
a second end plate 13, a second communication passage 131, and a fourth communication passage 132;
the accommodating groove 14, the bottom wall 141, the first edge 1411, the second edge 1412, the air guide wall 142, the first air guide wall 1421, and the second air guide wall 1422.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the related art, the temperature rise is too high in the running process of the motor, so that the motor aging is accelerated, and the functional safety of the motor is affected. At present, the motor mainly adopts a shell cooling flow channel to cool the stator, and the rotor end plate structure can assist in cooling the rotor.
A rotor assembly 1 according to an embodiment of the present invention is described below with reference to fig. 1-5.
The rotor assembly 1 according to the present invention comprises a rotor core 11, a first end plate 12 and a second end plate 13. A cooling passage 111 is formed in the rotor core 11; the first end plate 12 is disposed at one end of the rotor core 11, and a first communication channel 121 is formed on the first end plate 12, and the first communication channel 121 communicates with the cooling channel 111; the second end plate 13 is disposed at one end of the rotor core 11, and a second communication channel 131 is formed on the second end plate 13, the second communication channel 131 communicating with the cooling channel 111; wherein at least part of the first communication channel 121 projected in the extending direction of the cooling channel 111 is located radially inside the cooling channel 111; and/or at least part of the projection of the second communication passage 131 in the extending direction of the cooling passage 111 is located radially outside the cooling passage 111.
The first end plate 12, the rotor core 11 and the second end plate 13 are in interference fit, the first end plate 12 and the second end plate 13 are coaxially fixed at two ends of the rotor core 11 with the same rotation shaft respectively, and the first end plate 12 and the second end plate 13 have the same structure. A cooling channel 111 is formed in the rotor core 11, a first communication channel 121 is formed on the first end plate 12, and the first communication channel 121 is communicated with the cooling channel 111; the second end plate 13 is provided with a second communication passage 131, and the second communication passage 131 communicates with the cooling passage 111; the number of cooling passages 111 is twice the number of the first communication passages 121 and the number of the second communication passages 131. The first communication channel 121, the cooling channel 111 and the second communication channel 131 constitute a cooling channel, wherein at least part of the projection of the first communication channel 121 in the extending direction of the cooling channel 111 is located radially inside the cooling channel 111; and/or at least part of the projection of the second communication channel 131 on the extending direction of the cooling channel 111 is located at the radial outer side of the cooling channel 111, so that the pressure intensity at the communication position of the first communication channel 121 and the cooling channel 111 is lower than that at the communication position of the second communication channel 131 and the cooling channel 111, in the rotor rotation process, pressure difference is generated at two ends of the rotor core 11, and then air flow is formed inside the cooling channel 111, in the air flow process, hot air inside the rotor core 11 is discharged in the air flow process flowing through the cooling channel 111, the temperature of the rotor core 11 can be effectively reduced, and the first end plate 12, the rotor core 11 and the second end plate 13 are connected through interference fit, so that the assembly is simpler.
According to an embodiment of the present invention, the inlet end of the second communication passage 131 is opened in the axial direction and communicates with the cooling passage 111, and the outlet end of the second communication passage 131 is opened in the radial direction.
The inlet end of the second communication channel 131 is opened in the axial direction and is communicated with the cooling channel 111, the gas flowing in the cooling channel 111 flows into the second communication channel 131 through the inlet end of the second communication channel 131, the gas brings the temperature inside the rotor core 11 out, and the gas is radially discharged after passing through the second communication channel 131, so that the temperature of the rotor core 11 is reduced.
According to an embodiment of the present invention, a side surface of the second end plate 13 facing the rotor core 11 is formed with a receiving groove 14 recessed toward away from the rotor core 11, the receiving groove 14 penetrating in a radial direction of the second end plate 13, an inner wall of the receiving groove 14 defining a second communication passage 131.
The second end plate 13 is formed with receiving grooves 14 recessed toward away from the rotor core 11 on a side surface thereof facing the rotor core 11, the number of the receiving grooves 14 is the same as that of the first communication passages 121, and the receiving grooves 14 are uniformly distributed on the second end plate 13. The holding groove 14 is radially penetrated at the second end plate 13, the inner wall of the holding groove 14 defines a second communication channel 131, and when the rotor rotates, the holding groove 14 forms air flow inside the rotor core 11 through the centrifugal principle, so that hot air inside the rotor core 11 is discharged, and the cooling effect on the rotor core 11 is improved.
According to one embodiment of the present invention, the inner wall of the receiving groove 14 includes a bottom wall 141 and an air guide wall 142. The bottom wall 141 is directly opposite to at least part of the cooling passage 111; the air guiding wall 142 is formed at least at a portion of the edge of the bottom wall 141, and the extending direction of the air guiding wall 142 is the same as the extending direction of the cooling channel 111.
The bottom wall 141 of the accommodating groove 14 is opposite to at least part of the cooling channel 111, and the projection of the bottom wall 141 of the accommodating groove 14 on the extending direction of the cooling channel 111 is higher than the projection of the cooling channel 111 on the extending direction, so that the pressure difference inside the cooling channel 111 is improved, when the rotor rotates, the wind speed inside the rotor core 11 is faster due to the pressure difference, the wind guide wall 142 is formed at least part of the edge of the bottom wall 141, the extending direction of the wind guide wall 142 is the same as the extending direction of the cooling channel 111, and when the rotor rotates, the wind guide wall 142 forms airflow inside the rotor core 11 by utilizing the centrifugal effect, and hot air inside the rotor core 11 is radially discharged, so that the temperature of the rotor core 11 is reduced.
According to one embodiment of the present invention, the bottom wall 141 includes a first edge 1411 and a second edge 1412, one end of the first edge 1411 intersects with one end of the second edge 1412, and the other end of the first edge 1411 is spaced apart from the other end of the second edge 1412 to define an air outlet of the second communication channel 131; the wind guiding wall 142 includes a first wind guiding wall 1421 and a second wind guiding wall 1422, where the first wind guiding wall 1421 is disposed on the first edge 1411 and perpendicular to the bottom wall 141; the second air guiding wall 1422 is disposed on the second edge 1412 and perpendicular to the bottom wall 141.
The first air guiding wall 1421 is disposed on the first edge 1411 and perpendicular to the bottom wall 141, the second air guiding wall 1422 is disposed on the second edge 1412 and perpendicular to the bottom wall 141, the first air guiding wall 1421 and the second air guiding wall 1422 form an included angle ranging from 0 ° to 90 °, according to some embodiments of the present invention, the included angle is generally 80 °, and since the first air guiding wall 1421 and the second air guiding wall 1422 are perpendicular to the bottom wall 141, the air guiding effect of the air guiding wall 142 is enhanced, the fluid flow velocity in the cooling channel 111 is improved, and the cooling effect on the rotor core 11 is better. One end of the first edge 1411 of the bottom wall 141 is intersected with one end of the second edge 1412, the other end of the first edge 1411 is arranged with the other end of the second edge 1412 at intervals to define an air outlet of the second communication channel 131, and during the rotation process of the rotor, the first air guide wall 1421 and/or the second air guide wall 1422 form an air flow inside the rotor core 11 by utilizing the centrifugal principle, and hot air inside the rotor core 11 is discharged through the air outlet, so that the temperature of the rotor core 11 can be reduced.
According to one embodiment of the invention, the angle α between the first edge 1411 and the second edge 1412 is α, which satisfies: alpha is more than or equal to 45 degrees and less than or equal to 110 degrees. Wherein, alpha is generally more than or equal to 45 degrees and less than or equal to 90 degrees, and the air guiding effect achieved by the first air guiding wall 1421 and the second air guiding wall 1422 which are vertical to the bottom wall 141 is outstanding, thereby being beneficial to improving the temperature reduction of the rotor core 11.
According to one embodiment of the present invention, the first and second wind guide walls 1421 and 1422 are configured as a plane or arc continuously extending in a radial direction.
The first air guiding wall 1421 and the second air guiding wall 1422 are configured as planes or arcs extending continuously in the radial direction, the first air guiding wall 1421 and the second air guiding wall 1422 are respectively perpendicular to the bottom wall 141, the first air guiding wall 1421, the second air guiding wall 1422 and the bottom wall 141 are configured as fan blade structures, in the rotor rotating process, the first air guiding wall 1421 and the second air guiding wall 1422 are configured as planes or arcs extending continuously in the radial direction, the air guiding effect can be improved, the wind speed in the cooling channel 111 is faster, more heat is conveniently taken away, and the cooling of the rotor core 11 is realized.
According to one embodiment of the invention, the first end plate 12 is provided with a third communication channel 122 communicating with the cooling channel 111, and the second end plate 13 is provided with a fourth communication channel 132 communicating with the cooling channel 111. At least part of the projection of the third communication passage 122 in the extending direction of the cooling passage 111 is located radially outside the cooling passage 111; and/or at least part of the projection of the fourth communication passage 132 in the extending direction of the cooling passage 111 is located radially inside the cooling passage 111.
The first end plate 12 and the second end plate 13 have the same structure, the first end plate 12 and the second section plate are assembled at two ends of the rotor core 11, the first end plate 12 is provided with a third communication channel 122 communicated with the cooling channel 111, the second end plate 13 is provided with a fourth communication channel 132 communicated with the cooling channel 111, the assembly scheme can be changed according to actual conditions, fluid can flow into the cooling channel 111 from the fourth communication channel 132 and then flow out from the cooling channel 111 through the third communication channel 122, a pressure difference is formed among the fourth communication channel 132, the cooling channel 111 and the third communication channel 122, the third communication channel 122 is an accommodating groove 14, the air speed of an internal air channel of the rotor core 11 is faster by utilizing the pressure difference and the centrifugal principle, more heat can be taken away, and the cooling effect is better.
According to an embodiment of the present invention, the first communication passage 121 and the third communication passage 122 are each configured in plural, and the plural first communication passages 121 and the plural third communication passages 122 are arranged at intervals in the circumferential direction; the second communication passage 131 and the fourth communication passage 132 are each configured in plural, and the plural second communication passages 131 and the plural fourth communication passages 132 are arranged at intervals in the circumferential direction.
The first communication channel 121, the cooling channel 111 and the second communication channel 131 are one stepped cooling channel, the fourth communication channel 132, the cooling channel 111 and the third communication channel 122 are one stepped cooling channel, the first communication channel 121 and the third communication channel 122 are all configured in plurality, and the plurality of first communication channels 121 and the plurality of third communication channels 122 are arranged at intervals in the circumferential direction; the second communication channels 131 and the fourth communication channels 132 are all configured to be a plurality of, the plurality of second communication channels 131 and the plurality of fourth communication channels 132 are arranged at intervals in the circumferential direction, according to the embodiment of the invention, the plurality of cooling channels form air flow inside the rotor core 11 by utilizing the pressure difference and the centrifugal principle to cool the rotor core 11, the first end plate 12 and the second end plate 13 are consistent in structure, the first end plate 12 and the second end plate 13 are matched with the cooling channels 111 to form the cooling channels by adjusting the relative positions of the first end plate 12 and the second end plate 13 in the assembly process, the effect of cooling the rotor core 11 is achieved, the first end plate 12 and the second end plate 13 are simple to process, the first end plate 12, the second end plate 13 and the rotor core 11 are in interference fit, and the assembly is convenient.
The motor according to the present invention is briefly described below.
The electric machine according to the invention comprises a rotor assembly 1 as described in any of the embodiments described above. Since the motor according to the invention comprises the rotor assembly 1 according to any one of the embodiments described above, the motor according to the invention has a better cooling effect, a longer service life and better safety.
The rotor assembly 1 according to the invention is briefly described below.
The rotor assembly 1 according to the present invention comprises a rotor core 11, a first end plate 12 and a second end plate 13. A cooling channel 111 is formed in the rotor core 11, a first end plate 12 is arranged at one end of the rotor core 11, a first communication channel 121 is formed on the first end plate 12, and the first communication channel 121 is communicated with the cooling channel 111; the second end plate 13 is disposed at one end of the rotor core 11, and a second communication channel 131 is formed on the second end plate 13, the second communication channel 131 communicating with the cooling channel 111; wherein at least part of the first communication passage 121 projected in the extending direction of the cooling passage 111 is located radially inward of the cooling passage 111; and/or at least part of the projection of the second communication passage 131 in the extending direction of the cooling passage 111 is located radially outside the cooling passage 111. A pressure difference is formed among the first end plate 12, the cooling channel 111 and the second end plate 13, fluid enters the cooling channel 111 from the first end plate 12 to carry out hot gas, and the fluid is discharged through the second end plate 13, so that the cooling effect on the rotor core 11 is achieved.
According to an embodiment of the present invention, the inlet end of the second communication passage 131 is opened in the axial direction and communicates with the cooling passage 111, and the outlet end of the second communication passage 131 is opened in the radial direction.
The inlet end of the second communication channel 131 is opened in the axial direction and is communicated with the cooling channel 111, the gas flowing in the cooling channel 111 flows into the second communication channel 131 through the inlet end of the second communication channel 131, the gas brings the temperature inside the rotor core 11 out, and the gas is radially discharged after passing through the second communication channel 131, so that the temperature of the rotor is reduced.
According to an embodiment of the present invention, a side surface of the second end plate 13 facing the rotor core 11 is formed with a receiving groove 14 recessed toward away from the rotor core 11, the receiving groove 14 penetrating in a radial direction of the second end plate 13, an inner wall of the receiving groove 14 defining a second communication passage 131.
The second end plate 13 is formed with receiving grooves 14 recessed toward away from the rotor core 11 on a side surface thereof facing the rotor core 11, the number of the receiving grooves 14 is the same as that of the first communication passages 121, and the receiving grooves 14 are uniformly distributed on the second end plate 13. The holding groove 14 is penetrated in the radial direction of the second end plate 13, the inner wall of the holding groove 14 defines a second communication channel 131, and when the rotor rotates, the holding groove 14 increases the flow velocity of the fluid in the rotor core 11 through the centrifugal principle, and improves the cooling effect on the rotor core 11.
According to one embodiment of the present invention, the inner wall of the receiving groove 14 includes a bottom wall 141 and an air guide wall 142. The bottom wall 141 is directly opposite to at least part of the cooling passage 111; the air guiding wall 142 is formed at least at a portion of the edge of the bottom wall 141, and the extending direction of the air guiding wall 142 is the same as the extending direction of the cooling channel 111.
According to one embodiment of the present invention, the bottom wall 141 includes a first edge 1411 and a second edge 1412, one end of the first edge 1411 intersects with one end of the second edge 1412, and the other end of the first edge 1411 is spaced apart from the other end of the second edge 1412 to define an air outlet of the second communication channel 131; the wind guide wall 142 includes: a first air guiding wall 1421 and a second air guiding wall 1422. The first air guiding wall 1421 is disposed on the first edge 1411 and perpendicular to the bottom wall 141; the second air guiding wall 1422 is disposed on the second edge 1412 and perpendicular to the bottom wall 141.
According to one embodiment of the invention, the angle α between the first edge 1411 and the second edge 1412 is α, which satisfies: alpha is more than or equal to 45 degrees and less than or equal to 110 degrees.
According to one embodiment of the present invention, the first and second wind guide walls 1421 and 1422 are configured as a plane or arc continuously extending in a radial direction.
According to one embodiment of the invention, the first end plate 12 is provided with a third communication channel 122 communicating with the cooling channel 111, the second end plate 13 is provided with a fourth communication channel 132 communicating with the cooling channel 111, and at least part of the third communication channel 122 projected in the extending direction of the cooling channel 111 is located radially outside the cooling channel 111; and/or at least part of the projection of the fourth communication passage 132 in the extending direction of the cooling passage 111 is located radially inside the cooling passage 111.
According to an embodiment of the present invention, the first communication passage 121 and the third communication passage 122 are each configured in plural, and the plural first communication passages 121 and the plural third communication passages 122 are arranged at intervals in the circumferential direction; the second communication passage 131 and the fourth communication passage 132 are each configured in plural, and the plural second communication passages 131 and the plural fourth communication passages 132 are arranged at intervals in the circumferential direction.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the invention, a "first feature" or "second feature" may include one or more of such features.
In the description of the present invention, "plurality" means two or more.
In the description of the invention, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.
In the description of the invention, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A rotor assembly for an electric machine, comprising:
a rotor core in which a cooling passage is formed;
the first end plate is arranged at one end of the rotor core, a first communication channel is formed on the first end plate, and the first communication channel is communicated with the cooling channel;
the second end plate is arranged at one end of the rotor core, a second communication channel is formed on the second end plate, and the second communication channel is communicated with the cooling channel; wherein the method comprises the steps of
At least part of the projection of the first communication channel in the extending direction of the cooling channel is positioned on the radial inner side of the cooling channel; and/or
At least part of the projection of the second communication channel in the extending direction of the cooling channel is located radially outside the cooling channel.
2. The rotor assembly for an electric machine according to claim 1, wherein an inlet end of the second communication passage is open in an axial direction and communicates with the cooling passage, and an outlet end of the second communication passage is open in a radial direction.
3. The rotor assembly for an electric machine according to claim 2, wherein a side surface of the second end plate facing the rotor core is formed with a receiving groove recessed toward away from the rotor core, the receiving groove penetrating in a radial direction of the second end plate, an inner wall of the receiving groove defining the second communication passage.
4. A rotor assembly for an electric machine according to claim 3, wherein the inner wall of the receiving groove comprises:
a bottom wall facing at least a portion of the cooling channel;
the air guide wall is formed on at least part of the edge of the bottom wall, and the extending direction of the air guide wall is the same as that of the cooling channel.
5. The rotor assembly for an electric machine of claim 4, wherein the bottom wall comprises: the air outlet of the second communication channel is defined by arranging one end of the first edge and one end of the second edge at intervals;
the wind guiding wall includes:
the first air guide wall is arranged on the first edge and is perpendicular to the bottom wall;
the second air guide wall is arranged on the second edge and perpendicular to the bottom wall.
6. The rotor assembly for an electric machine of claim 5, wherein an angle between the first edge and the second edge is α, the α satisfying: alpha is more than or equal to 45 degrees and less than or equal to 110 degrees.
7. The rotor assembly for an electric machine according to claim 6, wherein the first air guiding wall and the second air guiding wall are configured as radially continuously extending planes or arcs.
8. A rotor assembly for an electric machine according to any one of claims 1-7, wherein the first end plate is provided with a third communication channel communicating with the cooling channel, the second end plate is provided with a fourth communication channel communicating with the cooling channel,
at least part of the projection of the third communication channel in the extending direction of the cooling channel is positioned at the radial outer side of the cooling channel; and/or
At least part of the projection of the fourth communication passage in the extending direction of the cooling passage is located radially inside the cooling passage.
9. The rotor assembly for an electric machine according to claim 8, wherein the first communication passage and the third communication passage are each configured in plural, and plural of the first communication passages and the plural third communication passages are arranged at intervals in a circumferential direction; the second communication passage and the fourth communication passage are each configured in plural, and the plural second communication passages and the plural fourth communication passages are arranged at intervals in the circumferential direction.
10. An electric machine, comprising: the rotor assembly of any one of claims 1-9.
CN202211103929.8A 2022-09-09 2022-09-09 Rotor assembly and motor Pending CN116247847A (en)

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CN116247847A true CN116247847A (en) 2023-06-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117118115A (en) * 2023-10-18 2023-11-24 小米汽车科技有限公司 Balance disc for motor, rotor assembly, motor and electric device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117118115A (en) * 2023-10-18 2023-11-24 小米汽车科技有限公司 Balance disc for motor, rotor assembly, motor and electric device
CN117118115B (en) * 2023-10-18 2024-01-09 小米汽车科技有限公司 Balance disc for motor, rotor assembly, motor and electric device

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