CN114726128A - Rotor subassembly, motor and car - Google Patents

Rotor subassembly, motor and car Download PDF

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Publication number
CN114726128A
CN114726128A CN202210409812.6A CN202210409812A CN114726128A CN 114726128 A CN114726128 A CN 114726128A CN 202210409812 A CN202210409812 A CN 202210409812A CN 114726128 A CN114726128 A CN 114726128A
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CN
China
Prior art keywords
rotor
iron core
shaft sleeve
core
rotor shaft
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
CN202210409812.6A
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Chinese (zh)
Inventor
邵非非
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.)
TAISHAN JIANGKOU ELECTRIC APPLIANCE MANUFACTORY Ltd
Original Assignee
TAISHAN JIANGKOU ELECTRIC APPLIANCE MANUFACTORY 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 TAISHAN JIANGKOU ELECTRIC APPLIANCE MANUFACTORY Ltd filed Critical TAISHAN JIANGKOU ELECTRIC APPLIANCE MANUFACTORY Ltd
Priority to CN202210409812.6A priority Critical patent/CN114726128A/en
Publication of CN114726128A publication Critical patent/CN114726128A/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
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The invention provides a rotor assembly, a motor and an automobile, wherein the rotor assembly comprises: the rotor comprises a rotor shaft sleeve, a rotating shaft, a plurality of iron core groups and a plurality of magnetic steels; the rotor shaft sleeve is provided with a rotating shaft hole and a plurality of positioning grooves; the rotating shaft penetrates through the rotating shaft hole; the iron core group comprises a plurality of rotor iron cores, one end of each rotor iron core is embedded into the positioning groove, supporting parts are arranged on two sides of each rotor iron core, magnetic steel mounting spaces are formed between every two adjacent rotor iron cores, and a plurality of magnetic steel mounting grooves are formed after the magnetic steel mounting spaces of the iron core groups are communicated; the magnetic steel penetrates through the magnetic steel mounting groove. In the rotor component, at least a certain distance is arranged between the positioning grooves connected with any two adjacent rotor cores, so that when the magnetic steel is magnetized, the magnetic flux of the magnetic steel is effectively weakened to form magnetic flux leakage through the rotor cores and flowing through the rotor shaft sleeve, the integral magnetizing saturation rate is greatly improved, the power density of the motor is favorably improved, and the cost of the motor is reduced.

Description

Rotor subassembly, motor and car
Technical Field
The invention relates to the technical field of motors, in particular to a rotor assembly, a motor and an automobile.
Background
When the motor is assembled, the rotor assembly generally adopts a single-chip magnetizing mode, namely: firstly, magnetizing the magnetic steel, and then placing the magnetic steel in a groove formed by a rotor iron core, wherein in the process, the magnetic rotor adsorbs more scrap iron and magnetic steel scraps, so that the cleaning is difficult, and the risk of motor failure is increased; if the integral magnetizing mode is adopted, namely: assembling non-magnetized magnetic steel to a groove formed by a rotor iron core, cleaning adhered scrap iron and magnetic steel scraps, and magnetizing the magnetic steel, so that the rotor basically does not contain the scraps, and the manufacturability of the process is greatly improved; however, the rotor core and the rotor shaft sleeve are made of magnetic conductive materials, a large part of magnetic flux generated by the magnetic steel circulates through the rotor core and the rotor shaft sleeve, the magnetic flux leakage of the part is large, the magnetic steel close to the rotor shaft sleeve is not saturated in magnetization, and compared with a single-sheet magnetization mode, the magnetic field energy of the integrally magnetized rotor is low; resulting in lower motor power density and higher cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a rotor assembly, a motor and an automobile.
One embodiment of the present invention provides a rotor assembly, including: the rotor comprises a rotor shaft sleeve, a rotating shaft, a plurality of iron core groups and a plurality of magnetic steels;
the rotor shaft sleeve is made of non-magnetic-conductive metal, a rotor shaft hole is formed in the rotor shaft sleeve, a plurality of positioning grooves are formed in the outer side of the rotor shaft sleeve and are arranged around the rotor shaft sleeve at preset intervals, and the positioning grooves extend along the axial direction of the rotor shaft sleeve;
the rotating shaft penetrates through the rotating shaft hole;
the plurality of iron core groups are sequentially arranged along the axial direction of the rotor shaft sleeve, each iron core group comprises a plurality of rotor iron cores, the plurality of rotor iron cores are arranged around the rotor shaft sleeve, one end of each rotor iron core is embedded into the positioning groove, supporting parts are arranged on two sides of each rotor iron core, and magnetic steel mounting spaces are formed by surrounding the adjacent rotor iron cores, the adjacent supporting parts of the rotor iron cores and the outer sides of the rotor shaft sleeves;
and the magnetic steels are correspondingly arranged in the magnetic steel mounting grooves in a penetrating manner.
Compared with the prior art, in the rotor assembly, at least a certain distance is arranged between the positioning grooves connected with any two adjacent rotor cores, so that when the magnetic steel is magnetized, magnetic flux of the magnetic steel is effectively weakened to pass through the rotor shaft sleeve through the rotor cores to form magnetic leakage, the integral magnetizing saturation rate is greatly improved, the power density of the motor is favorably improved, and the cost of the motor is reduced.
In some optional embodiments, the rotor core includes a base body portion, a first connecting portion, and a plurality of position limiting portions, the support portions are respectively disposed at two sides of the base body portion, the first connecting portion is disposed at one end of the base body portion, the position limiting portion is disposed at least one side of the first connecting portion, and the magnetic steel mounting space is formed between the base body portion adjacent to the rotor core, the support portion adjacent to the rotor core, and the outer side of the rotor bushing;
the constant head tank is in the tip of rotor shaft sleeve has the opening, the inner wall of constant head tank is provided with a plurality of first spacing grooves, first connecting portion with spacing portion follows the opening embedding in the constant head tank, spacing portion stretches into first spacing inslot.
In some optional embodiments, a second limiting groove and a limiting block are arranged on the rotor core, the second limiting groove and the limiting block are respectively located in front of and behind the rotor core in the axial direction of the rotor shaft sleeve, and the limiting block of the rotor core extends into the second limiting groove of the rotor core adjacent to the iron core group.
In some alternative embodiments, the plurality of iron core groups are at least one first iron core group and at least one second iron core group;
in the first iron core group, a blocking space is formed between the supporting parts of the adjacent rotor iron cores, and the blocking space and the magnetic steel mounting space are sequentially arranged along the direction close to the rotor shaft sleeve;
in the second iron core group, it is adjacent through second connecting part interconnect between rotor core's the supporting part, magnet steel installation space is formed at adjacent rotor core, adjacent rotor core's supporting part the second connecting part with between the outside of rotor shaft sleeve.
In some optional embodiments, the number of the first iron core groups is greater than the number of the second iron core groups.
In some alternative embodiments, the rotor core is provided with a plurality of lightening holes.
In some alternative embodiments, the lightening holes of the rotor cores of adjacent core groups are communicated with each other.
In some alternative embodiments, an end surface of an end of the rotor core remote from the rotor bushing is a spline curve in a cross section perpendicular to an axial direction of the rotor bushing.
Another embodiment of the present invention provides a motor including: a machine casing, a stator assembly and a rotor assembly as described above, the stator assembly and the rotor assembly being disposed within the machine casing.
Another embodiment of the present invention provides an automobile including: the motor comprises a body, a plurality of wheels and the motor, wherein the wheels are arranged on the body, and a rotating shaft of a rotor assembly of the motor is in transmission connection with the wheels.
In order that the invention may be more clearly understood, specific embodiments thereof will be described hereinafter with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a rotor assembly according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a rotor bushing in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of one side of a rotor assembly in accordance with one embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first set of iron cores, magnetic steel, and rotor sleeve according to an embodiment of the present invention;
FIG. 5 is a magnetic flux density cloud of a rotor assembly of a comparative example when fully magnetized;
FIG. 6 is a magnetic flux density cloud when the rotor assembly of one embodiment of the present invention is fully magnetized;
FIG. 7 is a graph comparing back EMF of a motor employing the rotor assembly of the present invention and a motor employing a rotor assembly of a comparative scheme;
fig. 8 is a schematic structural view of a rotor core of the first core group according to an embodiment of the present invention;
FIG. 9 is an enlarged view at A shown in FIG. 4;
fig. 10 is a cross-sectional view of a rotor core of one embodiment of the present invention;
fig. 11 is a schematic structural diagram of a second iron core set, magnetic steel and a rotor bushing according to an embodiment of the invention.
10. A rotor shaft sleeve; 11. a rotating shaft hole; 12. positioning a groove; 13. a first limit groove; 20. a rotating shaft; 30. a rotor core; 31. a support portion; 311. a magnetic steel mounting space; 312. blocking the space; 32. a base portion; 33. a first connection portion; 34. a limiting part; 35. a second limit groove; 36. a limiting block; 37. a second connecting portion; 38. lightening holes; 39. spline curves; 40. magnetic steel; 50. a fixing plate; 51. and a through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, 2 and 3, fig. 1 is a schematic structural view of a rotor assembly according to an embodiment of the present invention, fig. 2 is a schematic structural view of a rotor bushing according to an embodiment of the present invention, and fig. 3 is a schematic structural view of one side of the rotor assembly according to an embodiment of the present invention, the rotor assembly including: rotor shaft sleeve 10, pivot 20, a plurality of iron core group and a plurality of magnet steel 40.
Referring to fig. 4, which is a schematic structural diagram of a first iron core set, magnetic steel, and a rotor shaft sleeve according to an embodiment of the present invention, the rotor shaft sleeve 10 is made of non-magnetic conductive metal, a hole 11 of a rotating shaft 20 is formed inside the rotor shaft sleeve 10, a plurality of positioning slots 12 are formed outside the rotor shaft sleeve 10, the plurality of positioning slots 12 are arranged around the rotor shaft sleeve 10 at a predetermined interval, and the positioning slots 12 extend along an axial direction of the rotor shaft sleeve 10; the rotating shaft 20 is arranged in the hole 11 of the rotating shaft 20 in a penetrating way. The plurality of iron core groups are sequentially arranged in the axial direction of the rotor bushing 10. The iron core group comprises a plurality of rotor iron cores 30, the rotor iron cores 30 are arranged around the rotor shaft sleeve 10, one end of each rotor iron core 30 is embedded into the positioning groove 12, supporting parts 31 are arranged on two sides of each rotor iron core 30, the side edges of the adjacent rotor iron cores 30, the supporting parts 31 of the adjacent rotor iron cores 30 and the outer side of the rotor shaft sleeve 10 surround to form a magnetic steel mounting space 311, the rotor iron cores 30 of the adjacent iron core groups are connected in a one-to-one correspondence mode, the magnetic steel mounting spaces 311 of the iron core groups are communicated with each other to form a plurality of magnetic steel mounting grooves, and the magnetic steel mounting grooves and the positioning grooves 12 are arranged around the rotor shaft sleeve 10 at intervals; in a plurality of magnet steel 40 one-to-one wear to locate the magnet steel mounting groove, supporting part 31 supports magnet steel 40, avoids magnet steel 40 to break away from the magnet steel mounting groove because of centrifugal force. In some optional embodiments, the plurality of iron core groups can be further divided into at least one first iron core group and at least one second iron core group, the supporting portions of the adjacent rotor iron cores of the second iron core group are connected through a second connecting portion, and the second connecting portion can also support the magnetic steel, so as to prevent the magnetic steel 40 from separating from the magnetic steel mounting groove due to centrifugal force.
When magnetizing magnet steel 40, magnet steel 40's magnetic flux enters into rotor shaft sleeve 10 through rotor core 30, because rotor shaft sleeve 10's non-magnetic conductivity, make magnet steel 40's magnetic flux be difficult to circulate at rotor shaft sleeve 10, and because there is certain distance at least at the interval between the constant head tank 12 that arbitrary two adjacent rotor cores 30 are connected, make magnet steel 40's magnetic flux be difficult to flow through the magnetic leakage that adjacent rotor core 30 formed after getting into rotor core 30, improve whole saturation rate of magnetizing by a wide margin, be favorable to improving motor power density, reduce motor cost. Due to the matching of the positioning grooves 12, the iron core group is easy to install and has stable structure. The preset interval between a plurality of constant head tank 12 can select suitable design according to actual need for the magnetic flux of magnet steel 40 is difficult to circulate between adjacent constant head tank 12.
In order to show more intuitively, a comparative test is performed on the rotor assembly according to an embodiment of the present invention and the rotor assembly according to a comparative scheme, in the rotor assembly according to the comparative scheme, the rotor bushing 10 is made of a magnetic conductive metal, the rotor bushing 10 does not employ the positioning groove 12, and the rotor core 30 is directly and fixedly connected to the rotor bushing 10. Please refer to fig. 5, which is a magnetic flux density cloud chart of the rotor assembly according to the comparison scheme during the integral magnetization, as can be seen from the figure, when the rotor is integrally magnetized, the magnetic flux circulates in the rotor shaft sleeve 10 after passing through the rotor core 30 sectors, and becomes larger magnetic flux leakage, and the magnetic flux rarely passes through the portion of the magnetic steel 40 close to the rotor shaft sleeve 10, so that the magnetization saturation rate of the portion is lower. Please refer to fig. 6, which is a magnetic flux density cloud chart of the rotor assembly according to an embodiment of the present invention during the integral magnetization, it can be seen that, when the rotor assembly is integrally magnetized, since the positioning slots 12 are spaced apart by a certain distance and the rotor shaft sleeve 10 is non-magnetic conductive, the magnetic flux rarely flows through the rotor shaft sleeve 10, the magnetic flux leakage is small, and the integral magnetization saturation rate of the rotor is relatively high.
Referring to fig. 7, it is a comparison diagram of the back electromotive force coefficients of a motor using the rotor assembly of the present invention and a motor using the rotor assembly of the comparison scheme, and it can be known from the diagram that under the same motor stator structure, the peak value of the back electromotive force coefficient of the motor using the rotor assembly of the present invention is 11.6V/krpm, while the peak value of the back electromotive force coefficient of the motor using the rotor assembly of the comparison scheme is 10.1V/krpm, and the back electromotive force coefficient of the motor using the rotor assembly of the present invention is improved by 14.8% compared with the back electromotive force coefficient of the motor using the rotor assembly of the comparison scheme. Under the condition that the motor needs to achieve the same performance, the material consumption required by the motor of the rotor assembly can be greatly reduced, the motor cost is reduced, and the volume and the weight of the motor are also reduced.
Referring to fig. 8 and 9, fig. 8 is a schematic structural diagram of a rotor core of a first core group according to an embodiment of the present invention, fig. 9 is an enlarged view of a portion a shown in fig. 4, in order to fix the rotor core 30 and improve structural stability of the rotor assembly, in some alternative embodiments, the rotor core 30 includes a base body portion 32, a first connecting portion 33 and a plurality of limiting portions 34, support portions 31 are respectively disposed on two sides of the base body portion 32, the first connecting portion 33 is disposed at one end of the base body portion 32, the limiting portions 34 are disposed on at least one side of the first connecting portion 33, and a magnetic steel mounting space 311 is formed between the base body portion 32 of an adjacent rotor core 30, the support portions 31 of an adjacent rotor core 30, and the outer side of the rotor bushing 10; the locating slot 12 has the opening at rotor shaft sleeve 10's tip, the inner wall of locating slot 12 is provided with a plurality of first spacing grooves 13, first connecting portion 33 and spacing portion 34 are from opening embedding locating slot 12 in, spacing portion 34 stretches into first spacing groove 13 in, base part 32 is located outside locating slot 12, first connecting portion 33 and spacing portion 34 then move to suitable position along locating slot 12, first connecting portion 33 and spacing portion 34 of the rotor core 30 of each core group follow opening entering locating slot 12 in proper order, because spacing portion 34 and the cooperation of first spacing groove 13, make rotor core 30 be difficult to break away from rotor shaft sleeve 10 in the radial direction. In the present embodiment, the first connecting portion 33 is provided with the stopper portions 34 on both sides thereof, and the positioning groove 12 is provided with the first stopper grooves 13 on the inner side walls thereof. Of course, the structure of the rotor core 30 and the positioning groove 12 is not limited thereto, and those skilled in the art can select other suitable structures according to the teachings of the present invention. In addition, some limiting structures may be disposed at the opening to limit the first connecting portion 33 and the limiting portion 34 from separating from the positioning slot 12.
To avoid the magnetic steel 40 from shaking, in some alternative embodiments, the rotor assembly further comprises two fixing plates 50; the two fixing plates 50 are sleeved on the rotating shaft 20 and are respectively positioned at two ends of the magnetic steel 40, so that the magnetic steel 40 is prevented from being deviated due to the axial impact force or electromagnetic pulling force along the rotating shaft 20, the motor is more stable, and the service life of the motor is longer; in addition, some through holes 51 for reducing weight can be added on the fixing plate 50 to save materials and reduce the weight of the motor. Some limiting structures may be disposed on the fixing plate 50 to limit the first connecting portion 33 and the limiting portion 34 from separating from the positioning slot 12. Of course, the two ends of the magnetic steel 40 can be limited in other manners, for example, the two ends of the rotor shaft sleeve 10 are provided with limiting rings, and the limiting rings can abut against the magnetic steel 40 and the rotor core 30 at the same time, so that the magnetic steel 40 and the rotor core 30 are difficult to move along the axial direction of the rotor shaft sleeve 10.
Referring to fig. 10, which is a cross-sectional view of a rotor core according to an embodiment of the present invention, in some optional embodiments, a second limiting groove 35 and a limiting block 36 are disposed on the rotor core 30, the second limiting groove 35 and the limiting block 36 are respectively located in front of and behind the rotor core 30 in the axial direction of the rotor shaft sleeve 10, the limiting block 36 of the rotor core 30 extends into the second limiting groove 35 of the rotor core 30 of an adjacent core set, and the limiting block 36 of the rotor core 30 is matched with the second limiting groove 35, so that the rotor cores 30 of different core sets do not relatively shift in the circumferential direction of the rotor shaft sleeve 10, and the overall structural stability is improved.
Referring to fig. 11, which is a schematic structural diagram of a second iron core group, magnetic steels and a rotor shaft sleeve according to an embodiment of the present invention, in some alternative embodiments, a plurality of iron core groups may be further divided into at least one first iron core group and at least one second iron core group; in the first core group, a blocking space 312 is formed between the support parts 31 of the adjacent rotor cores 30, and the blocking space 312 and the magnetic steel mounting space 311 are sequentially arranged in a direction approaching the rotor bushing 10. Due to the existence of the blocking space 312, the magnetic flux of the magnetic steel 40 can be prevented from flowing between the rotor cores 30 to cause leakage flux.
In the second core group, the support portions 31 of the adjacent rotor cores 30 are connected to each other by the second connection portion 37, and the magnetic steel mounting space 311 is formed between the side of the adjacent rotor core 30, the support portions 31 of the adjacent rotor cores 30, the second connection portion 37, and the outer side of the rotor bushing 10. Since the second connecting portion 37 connects two adjacent support portions 31, it is possible to prevent the rotor cores 30 of the same core group from being offset in the circumferential direction; and because the supporting parts 31 are mutually fixed through the second connecting parts 37, the iron core group can obtain higher centrifugal force resistance. Because the iron core of first iron core group and the iron core of second iron core group are by the cooperation of stopper 36 and spacing groove and reciprocal anchorage for rotor core 30 of first iron core group also can not follow the circumference skew, makes rotor subassembly overall structure stability high. All the rotor cores 30 and all the second connecting portions 37 of the second core group may be integrally formed.
Because support 31 interconnect can make some magnetic fluxes of magnet steel 40 flow through support 31 and form the magnetic leakage, reduce motor power density, avoid making the motor performance have obvious reduction on the basis of improving stable in structure, the quantity of first iron core group and second iron core group should design according to actual need, in some optional embodiments, the quantity of first iron core group is greater than the quantity of second iron core group. In this embodiment, the second iron core groups are located at two ends of the rotor shaft sleeve 10, which is beneficial to improving the structural stability and avoiding reducing the performance of the motor.
In some alternative embodiments, the rotor core 30 is provided with a plurality of lightening holes 38, which can reduce the weight of the rotor assembly.
In some alternative embodiments, the lightening holes 38 of the rotor cores 30 of the adjacent core groups are communicated with each other, and when the connecting part and the limiting part 34 enter the positioning slot 12, the positioning can be performed by utilizing the lightening holes 38, and the lightening holes 38 are aligned with each other, namely the positioning is realized; moreover, the lightening holes 38 can facilitate dynamic balance check of the rotor assembly; the lightening holes 38 also contribute to reducing the noise of the motor, so that the motor is more silent.
In some optional embodiments, the end face of the end of rotor core 30 far away from rotor sleeve 10 is spline 39 on the section perpendicular to rotor sleeve 10 in the axial direction, so that the change of the generated motor air-gap magnetic field is smooth, the sine of the motor air-gap magnetic field is higher, the electromagnetic noise generated by air-gap flux density higher harmonics is effectively reduced, the motor is quieter, and the user can obtain better experience. Of course, the shape of the cross section of the end surface of the rotor core 30 at the end far away from the rotor shaft sleeve 10 in the axial direction perpendicular to the rotor shaft sleeve 10 is not limited to this, and those skilled in the art can also select other suitable structures according to the teachings of the present invention, for example, an arc line, or a line formed by connecting and combining a plurality of arc lines and a plurality of straight line segments. In the present embodiment, the end surface of the base portion 32 at the end away from the rotor bushing 10 is a spline curve 39 in a cross section perpendicular to the axial direction of the rotor bushing 10.
The above-described rotor assembly may be applied to a motor including: a machine casing, a stator assembly and a rotor assembly as described above, the stator assembly and the rotor assembly being disposed within the machine casing.
The above-described motor may be applied to a vehicle, which includes: the motor comprises a body, a plurality of wheels and the motor as described above, wherein the wheels are arranged on the body, and a rotating shaft 20 of a rotor assembly of the motor is in transmission connection with the wheels. Of course, the electric motor may be drivingly connected to only some of the wheels, depending on the actual driving mode of the wheels.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A rotor assembly, comprising: the rotor comprises a rotor shaft sleeve, a rotating shaft, a plurality of iron core groups and a plurality of magnetic steels;
the rotor shaft sleeve is made of non-magnetic-conductive metal, a rotor shaft hole is formed in the rotor shaft sleeve, a plurality of positioning grooves are formed in the outer side of the rotor shaft sleeve and are arranged around the rotor shaft sleeve at preset intervals, and the positioning grooves extend along the axial direction of the rotor shaft sleeve;
the rotating shaft penetrates through the rotating shaft hole;
the plurality of iron core groups are sequentially arranged along the axial direction of the rotor shaft sleeve, each iron core group comprises a plurality of rotor iron cores, the plurality of rotor iron cores are arranged around the rotor shaft sleeve, one end of each rotor iron core is embedded into the positioning groove, supporting parts are arranged on two sides of each rotor iron core, and magnetic steel mounting spaces are formed by surrounding the adjacent rotor iron cores, the adjacent supporting parts of the rotor iron cores and the outer sides of the rotor shaft sleeves;
and the magnetic steels are correspondingly arranged in the magnetic steel mounting grooves in a penetrating manner.
2. A rotor assembly as claimed in claim 1, wherein: the rotor core comprises a base body part, a first connecting part and a plurality of limiting parts, the supporting parts are respectively arranged on two sides of the base body part, the first connecting part is arranged at one end of the base body part, the limiting parts are arranged on at least one side of the first connecting part, and the magnetic steel mounting space is formed between the base body part adjacent to the rotor core, the supporting part adjacent to the rotor core and the outer side of the rotor shaft sleeve;
the constant head tank is in the tip of rotor shaft sleeve has the opening, the inner wall of constant head tank is provided with a plurality of first spacing grooves, first connecting portion with spacing portion follows the opening embedding in the constant head tank, spacing portion stretches into first spacing inslot.
3. A rotor assembly as claimed in claim 1, wherein: the rotor core is provided with a second limiting groove and a limiting block, the second limiting groove and the limiting block are located in the axial direction of the rotor shaft sleeve respectively in the front and the rear of the rotor core, and the limiting block of the rotor core extends into the second limiting groove of the rotor core of the iron core group.
4. A rotor assembly as claimed in claim 3, wherein: the plurality of iron core groups are divided into at least one first iron core group and at least one second iron core group;
in the first iron core group, a blocking space is formed between the supporting parts of the adjacent rotor iron cores, and the blocking space and the magnetic steel mounting space are sequentially arranged along the direction close to the rotor shaft sleeve;
in the second iron core group, it is adjacent through second connecting part interconnect between rotor core's the supporting part, magnet steel installation space is formed at adjacent rotor core, adjacent rotor core's supporting part the second connecting part with between the outside of rotor shaft sleeve.
5. A rotor assembly as claimed in claim 4, wherein: the number of the first iron core groups is larger than that of the second iron core groups.
6. A rotor assembly as claimed in any one of claims 1 to 5, wherein: and a plurality of lightening holes are formed in the rotor iron core.
7. A rotor assembly as claimed in claim 6, wherein: and lightening holes of the rotor cores of the adjacent iron core groups are mutually communicated.
8. A rotor assembly as claimed in any one of claims 1 to 5, wherein: the end face of one end, far away from the rotor shaft sleeve, of the rotor iron core is a spline curve on a section perpendicular to the axial direction of the rotor shaft sleeve.
9. An electric machine, comprising: a machine casing, a stator assembly and a rotor assembly as claimed in any one of claims 1 to 8, the stator assembly and the rotor assembly being disposed within the machine casing.
10. An automobile, comprising: a body, a plurality of wheels and a motor as claimed in claim 9, wherein the wheels are arranged on the body, and a rotating shaft of a rotor assembly of the motor is in transmission connection with the wheels.
CN202210409812.6A 2022-04-19 2022-04-19 Rotor subassembly, motor and car Pending CN114726128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210409812.6A CN114726128A (en) 2022-04-19 2022-04-19 Rotor subassembly, motor and car

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210409812.6A CN114726128A (en) 2022-04-19 2022-04-19 Rotor subassembly, motor and car

Publications (1)

Publication Number Publication Date
CN114726128A true CN114726128A (en) 2022-07-08

Family

ID=82243200

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210409812.6A Pending CN114726128A (en) 2022-04-19 2022-04-19 Rotor subassembly, motor and car

Country Status (1)

Country Link
CN (1) CN114726128A (en)

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