CN112583153A - Rotor of motor, driving motor and vehicle - Google Patents

Rotor of motor, driving motor and vehicle Download PDF

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Publication number
CN112583153A
CN112583153A CN201910944378.XA CN201910944378A CN112583153A CN 112583153 A CN112583153 A CN 112583153A CN 201910944378 A CN201910944378 A CN 201910944378A CN 112583153 A CN112583153 A CN 112583153A
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CN
China
Prior art keywords
permanent magnet
rotor
rotor core
core
permanent
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Granted
Application number
CN201910944378.XA
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Chinese (zh)
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CN112583153B (en
Inventor
蒲晓敏
方亮
王飞
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Anqing Weiling Auto Parts Co ltd
Guangdong Welling Auto Parts Co Ltd
Anhui Welling Auto Parts Co Ltd
Original Assignee
Anhui Welling Auto Parts Co Ltd
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Application filed by Anhui Welling Auto Parts Co Ltd filed Critical Anhui Welling Auto Parts Co Ltd
Priority to CN201910944378.XA priority Critical patent/CN112583153B/en
Publication of CN112583153A publication Critical patent/CN112583153A/en
Application granted granted Critical
Publication of CN112583153B publication Critical patent/CN112583153B/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • H02K1/272Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753Inner 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
    • H02K1/276Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The invention discloses a rotor of a motor, a driving motor and a vehicle, wherein the rotor comprises: at least one segment of rotor core, the at least one segment of rotor core comprising a first rotor core; the permanent magnet rotor comprises at least one group of first permanent magnet groups and at least one group of second permanent magnet groups, wherein the first permanent magnet groups and the second permanent magnet groups are arranged at intervals along the circumferential direction of a first rotor iron core, each group of first permanent magnet groups comprises at least one first permanent magnet, each first permanent magnet extends along the radial direction of the first rotor iron core, and the first permanent magnets are distributed along the circumferential direction of the first rotor iron core when being multiple; each group of second permanent magnet groups comprises at least one second permanent magnet, each second permanent magnet extends along the radial direction of the first rotor iron core, the second permanent magnets are distributed along the circumferential direction of the first rotor iron core when being multiple, the first permanent magnets are rare-earth permanent magnets, and the second permanent magnets are non-rare-earth permanent magnets. According to the rotor provided by the embodiment of the invention, the use amount of the rare earth permanent magnet is reduced, the manufacturing cost is reduced, the remanence can be increased, and the demagnetization resistance is improved.

Description

Rotor of motor, driving motor and vehicle
Technical Field
The invention relates to the technical field of motors, in particular to a rotor of a motor, a driving motor and a vehicle.
Background
The development of permanent-magnet machine is closely related with the development of permanent-magnet material, compares with traditional electric excitation motor, and permanent-magnet machine has simple structure, operation reliable, small, the quality is light, the loss is little, efficient high characteristics, consequently by wide application.
For the most important permanent magnet material in the permanent magnet motor, the price directly determines the cost of the permanent magnet motor. Rare earth materials are used as strategic resources, the supply is unstable throughout the year, and the price is continuously increased, so that how to reduce the manufacturing cost of the motor while ensuring the efficiency of the motor becomes the key point of motor research and development.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, an object of the invention is to propose a rotor of an electric machine that reduces the amount of rare earth permanent magnets used.
Another object of the present invention is to provide a driving motor having the above rotor.
Another object of the present invention is to provide a vehicle having the above-described drive motor.
According to the rotor of the motor of the embodiment of the present invention, the rotor includes: at least one segment of a rotor core, the at least one segment of the rotor core comprising a first rotor core; the first permanent magnet groups are arranged on the first rotor core, each first permanent magnet group comprises at least one first permanent magnet, each first permanent magnet extends along the radial direction of the first rotor core, and when the first permanent magnet groups comprise a plurality of first permanent magnets, the first permanent magnets are distributed along the circumferential direction of the first rotor core; at least a set of second permanent magnet group, second permanent magnet group install in first rotor core, first permanent magnet group with second permanent magnet group is followed the circumference interval distribution of first rotor core, every group the second permanent magnet group includes at least one second permanent magnet, every the second permanent magnet is followed the radial extension of first rotor core, second permanent magnet group is including a plurality of when the second permanent magnet, it is a plurality of the second permanent magnet is followed the circumference distribution of first rotor core, first permanent magnet is the tombarthite permanent magnet, the second permanent magnet is non-tombarthite permanent magnet.
According to the rotor of the motor, the rare earth permanent magnets and the non-rare earth permanent magnets are arranged on the first rotor iron core at the same time, so that the using amount of the rare earth permanent magnets is reduced, the manufacturing cost is obviously reduced, and the first permanent magnets and the second permanent magnets are arranged in a radial type mode extending along the radial direction of the first rotor iron core, so that the structural strength of the first rotor iron core is improved, the remanence can be increased, and the demagnetization resistance is improved.
In addition, the rotor of the motor according to the above embodiment of the present invention may further have the following additional technical features:
according to some embodiments of the present invention, the first permanent magnet groups are a plurality of groups, each group of the first permanent magnet groups includes one first permanent magnet, the number of the second permanent magnet groups is equal to that of the first permanent magnet groups, and each group of the second permanent magnet groups includes one second permanent magnet.
In some embodiments of the present invention, the rotor includes a plurality of segments of the rotor core, the plurality of segments of the rotor core are stacked in an axial direction of the rotor, the plurality of segments of the rotor core further include a second rotor core, the rotor further includes a plurality of second core permanent magnets, the second core permanent magnets are mounted to the second rotor core and extend in a radial direction of the second rotor core, the plurality of second core permanent magnets are distributed in a circumferential direction of the second rotor core, the plurality of second core permanent magnets include at least one third permanent magnet group and at least one fourth permanent magnet group, each third permanent magnet group includes at least one third permanent magnet, each fourth permanent magnet group includes at least one fourth permanent magnet, the third permanent magnet is a rare-earth permanent magnet, the fourth permanent magnet is a non-rare-earth permanent magnet, in the axial direction of the rotor, the axial projections of the first permanent magnet and the fourth permanent magnet are at least partially overlapped, and the axial projections of the second permanent magnet and the third permanent magnet are at least partially overlapped.
In some embodiments of the present invention, the first permanent magnet and the third permanent magnet are the same size, and the second permanent magnet and the fourth permanent magnet are the same size.
In some embodiments of the present invention, after the first rotor core rotates around the axis of the rotor by a predetermined angle, axial projections of the first permanent magnet disposed on the first rotor core and the third permanent magnet disposed on the second rotor core completely coincide, and axial projections of the second permanent magnet disposed on the first rotor core and the fourth permanent magnet disposed on the second rotor core completely coincide.
In some embodiments of the present invention, the rotor includes a plurality of segments of the rotor core, the plurality of segments of the rotor core being stacked in an axial direction of the rotor, the plurality of segments of the rotor core including a third rotor core, the rotor further including: at least one third permanent magnet group, where the third permanent magnet group is installed on the second rotor core, each third permanent magnet group includes at least one third permanent magnet, each third permanent magnet extends along the radial direction of the second rotor core, and when the third permanent magnet group includes a plurality of third permanent magnets, the plurality of third permanent magnets are distributed along the circumferential direction of the second rotor core; at least one fourth permanent magnet group installed at the second rotor core, the third permanent magnet group and the fourth permanent magnet group are distributed at intervals along the circumferential direction of the second rotor core, each fourth permanent magnet group comprises at least one fourth permanent magnet, each fourth permanent magnet extends along the radial direction of the second rotor core, when the fourth permanent magnet group comprises a plurality of fourth permanent magnets, the plurality of fourth permanent magnets are distributed along the circumferential direction of the second rotor core, the third permanent magnet is a rare-earth permanent magnet, the fourth permanent magnet is a non-rare-earth permanent magnet, in the axial direction of the rotor, at least one axial projection of the first permanent magnet and at least one axial projection of the fourth permanent magnet are at least partially overlapped and correspond to the same magnetic pole, and at least one axial projection of the second permanent magnet and at least one axial projection of the third permanent magnet are at least partially overlapped and correspond to the same magnetic pole.
In some embodiments of the present invention, the rotor includes a plurality of segments of the rotor core, the plurality of segments of the rotor core are stacked in an axial direction of the rotor, the plurality of segments of the rotor core include a third rotor core, the rotor further includes a plurality of seventh permanent magnets, the seventh permanent magnets are mounted on the third rotor core and extend in a radial direction of the third rotor core, the plurality of seventh permanent magnets are distributed along a circumferential direction of the third rotor core, the seventh permanent magnets are rare-earth permanent magnets, in an axial direction of the rotor, one of the first rotor cores is disposed adjacent to another of the first rotor cores, the second rotor core or the third rotor core, axial projections of at least one of the first permanent magnets, at least one of the fourth permanent magnets and at least one of the seventh permanent magnets at least partially overlap and correspond to a same magnetic pole, the axial projections of the at least one second permanent magnet, the at least one third permanent magnet and the at least one seventh permanent magnet are at least partially overlapped and correspond to the same magnetic pole.
In some embodiments of the present invention, the first rotor core, the second rotor core, and the third rotor core are equal in number.
In some embodiments of the present invention, one of the first rotor core, one of the second rotor core, and one of the third rotor core are stacked in an axial direction of the rotor to constitute one core group in which the second rotor core is located between the first rotor core and the third rotor core, and the rotor includes a plurality of core groups stacked in the axial direction of the rotor.
In some embodiments of the present invention, in the iron core group, a center line of the first permanent magnet extending in the radial direction of the rotor is oa, a center line of the fourth permanent magnet corresponding to the same magnetic pole as the first permanent magnet extending in the radial direction of the rotor is ob, a center line of the seventh permanent magnet corresponding to the same magnetic pole as the first permanent magnet extending in the radial direction of the rotor is oc, an acute angle included angle between the oa and the ob along an axial projection of the rotor is 1 ° to 3 °, an acute angle included angle between the ob and the oc along an axial projection of the rotor is 1 ° to 3 °, and an acute angle included angle between the oa and the oc along an axial projection of the rotor is 2 ° to 6 °.
According to some embodiments of the invention, the second permanent magnets and the first permanent magnets have equal lengths extending in a radial direction of the first rotor core, and a width ratio extending in a tangential direction of the first rotor core is 2.32-3.57.
According to some embodiments of the invention a ratio of a length of the first permanent magnet extending in a radial direction of the first rotor core to a width of the first permanent magnet extending in a tangential direction of the first rotor core is 6.85-7.96, and a ratio of a length of the second permanent magnet extending in the radial direction of the first rotor core to a width of the second permanent magnet extending in the tangential direction of the first rotor core is 4.65-5.02.
According to some embodiments of the invention, the first permanent magnet extends in a radial direction of the first rotor core with a length L and an outer diameter D of the first rotor core, wherein D/L is 3.2 ≦ D/L ≦ 4.3.
According to some embodiments of the invention, the first permanent magnet and the second permanent magnet are equal in number and are arranged at intervals.
According to some embodiments of the invention, the rotor further comprises: the fifth permanent magnet is arranged on the first rotor iron core and extends along the circumferential direction of the first rotor iron core, one fifth permanent magnet is arranged between the adjacent first permanent magnet and the second permanent magnet, between the adjacent two first permanent magnets or between the adjacent two second permanent magnets in the circumferential direction of the first rotor iron core, and the fifth permanent magnet is a rare earth permanent magnet.
According to some embodiments of the invention, a ratio of a length of the fifth permanent magnet in a circumferential direction of the first rotor core to a width of the fifth permanent magnet in a radial direction of the first rotor core is 5.13 to 6.26.
According to some embodiments of the present invention, a center line of the second permanent magnet extending in the radial direction of the first rotor core is od, a center line of the first permanent magnet adjacent to the second permanent magnet extending in the radial direction of the first rotor core is oa, a center line of the fifth permanent magnet adjacent to the second permanent magnet extending in the radial direction of the first rotor core is oe, an acute angle between od and oe is α 1, and α 1 satisfies: 20 DEG-alpha 1-35 DEG, the acute included angle between oa and od is alpha 2 and alpha 2 satisfies: 2 alpha 1 is less than or equal to alpha 2.
In some embodiments of the present invention, a ratio of sectional areas of the fifth permanent magnet and the first permanent magnet in a radial direction of the rotor is 3.12 to 3.94.
In some embodiments of the invention, the rotor further comprises: the sixth permanent magnet is installed on the second rotor iron core and extends along the circumferential direction of the second rotor iron core, one sixth permanent magnet is arranged between the adjacent third permanent magnet and the fourth permanent magnet, between the adjacent two third permanent magnets or between the adjacent two fourth permanent magnets in the circumferential direction of the second rotor iron core, the sixth permanent magnet is a rare earth permanent magnet, and the sixth permanent magnet is the same as the fifth permanent magnet in size.
In some embodiments of the invention, the rotor further comprises: and the eighth permanent magnet is arranged on the third rotor core and extends along the circumferential direction of the third rotor core, and is arranged between every two adjacent seventh permanent magnets in the circumferential direction of the third rotor core, and is a rare earth permanent magnet, and the size of the eighth permanent magnet is the same as that of the fifth permanent magnet.
In some embodiments of the invention, the number of the first permanent magnets and the number of the second permanent magnets are equal and are respectively half of the number of poles of the rotor, and the number of poles of the rotor is six poles or eight poles.
A drive motor according to an embodiment of the present invention includes a rotor of a motor according to an embodiment of the present invention.
A vehicle according to an embodiment of the present invention includes a drive motor according to an embodiment of the present invention.
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 above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view of a rotor according to some embodiments of the present invention;
FIG. 2 is a schematic structural view of a rotor according to further embodiments of the present invention;
fig. 3 is a schematic structural view of a first rotor core and permanent magnets of a rotor according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a second rotor core and permanent magnets of a rotor according to an embodiment of the present invention;
fig. 5 is a partial structural view of a first rotor core and permanent magnets of a rotor according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a third rotor core and permanent magnets of the rotor according to the embodiment of the present invention;
FIG. 7 is a plot of the moment angle of a rotor and a pure rare earth permanent magnet rotor according to an embodiment of the invention.
Reference numerals:
a rotor 100;
a first rotor core 10; a first permanent magnet 11; a second permanent magnet 12; a fifth permanent magnet 13;
a second rotor core 20; a third permanent magnet 21; a fourth permanent magnet 22; a sixth permanent magnet 23;
a third rotor core 30; a seventh permanent magnet 31; an eighth permanent magnet 32.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention. In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features, and "a plurality" means two or more.
A rotor 100 of a motor, a driving motor, and a vehicle according to an embodiment of the present invention are described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a rotor 100 of a motor according to an embodiment of the present invention includes: the permanent magnet synchronous motor comprises at least one section of rotor core, at least one group of first permanent magnet group and at least one group of second permanent magnet group.
In some embodiments of the present invention, each segment of the rotor core may be formed by axially stacking a plurality of silicon steel sheets. Specifically, the silicon steel sheets can be fixed in a manner that a plurality of silicon steel sheets are stacked on a tool for casting, so that a section of the rotor core is formed; or the manufacturing of the section of the rotor iron core is completed by welding the outer circles of the silicon steel sheets, stamping the self-buckling points on the silicon steel sheets for buckling, punching rivets on the silicon steel sheets for riveting or gluing by using special adhesive and the like. In the embodiment where the rotor 100 includes a multi-segment rotor core, the multi-segment rotor core may be connected by pressing at a self-fastening point, riveting with a rivet, or hinging with a special adhesive.
Specifically, at least one of the sections of the rotor core includes the first rotor core 10, that is, in an embodiment in which the rotor 100 includes one section of the rotor core (in other words, the rotor core of the rotor 100 is an integral piece), the one section of the rotor core is the first rotor core 10, and in an embodiment in which the rotor 100 includes a plurality of sections of the rotor core (in other words, the rotor core of the rotor 100 is axially arranged in segments), at least one of the sections of the rotor core is the first rotor core 10.
As shown in fig. 3, the first permanent magnet group and the second permanent magnet group are both mounted to the first rotor core 10. The first permanent magnet groups and the second permanent magnet groups are distributed at intervals along the circumferential direction of the first rotor core 10, in other words, in the circumferential direction of the first rotor core 10, the first permanent magnet groups, the second permanent magnet groups, the first permanent magnet groups, and the second permanent magnet groups … … are alternately arranged. Of course, in the embodiment in which the first permanent magnet group and the second permanent magnet group are both a group, the first permanent magnet group and the second permanent magnet group are arranged in the circumferential direction of the first rotor core 10.
Each first permanent magnet group comprises at least one first permanent magnet 11, each first permanent magnet 11 extends along the radial direction of the first rotor core 10, and in the embodiment where the first permanent magnet group comprises a plurality of first permanent magnets 11, the plurality of first permanent magnets 11 are distributed along the circumferential direction of the first rotor core 10. Each second permanent magnet group comprises at least one second permanent magnet 12, each second permanent magnet 12 extending in a radial direction of the first rotor core 10, and in an embodiment in which the second permanent magnet group comprises a plurality of second permanent magnets 12, the plurality of second permanent magnets 12 are distributed in a circumferential direction of the first rotor core 10.
For convenience of description, all of the first permanent magnet 11 and the second permanent magnet 12 will be collectively referred to as a first core permanent magnet hereinafter. As shown in fig. 3, the plurality of first iron core permanent magnets form a parallel magnetic circuit by adopting a spoke type arrangement manner (spoke type arrangement manner) extending along the radial direction of the first rotor iron core 10 and distributed along the circumferential direction of the first rotor iron core 10, that is, the plurality of first iron core permanent magnets form different closed magnetic circuits, so that the flux path of the rotor 100 is improved, the utilization rate of the permanent magnets of the motor is improved, and key electromagnetic performance parameters such as no-load air gap flux density and no-load back electromotive force are also improved, so that the overall performance of the motor is improved.
In some embodiments of the present invention, an embedded structure in which the first core permanent magnet is at least partially embedded in the first rotor core 10 may be adopted in embodiments of the present invention, so that the amount of permanent magnets, especially the amount of rare earth permanent magnets, may be reduced, the structural strength of the first rotor core 10 may be improved, and the remanence may be increased, thereby improving the demagnetization resistance.
As shown in fig. 3, the first permanent magnet 11 is a rare-earth permanent magnet such as neodymium iron boron (NdFeB), 1:5 rare-earth cobalt (1:5 type R-Co permanent magnet), 2:17 rare-earth cobalt (2:17 type R-Co permanent magnet), a rare-earth transition metal permanent magnet, a rare-earth iron-nitrogen permanent magnet alloy, or the like, and the second permanent magnet 12 is a non-rare-earth permanent magnet such as ferrite, alnico, a plastically deformable permanent magnet, or the like. The non-rare earth permanent magnet with low price and stable supply is combined with the rare earth permanent magnet with excellent electromagnetic performance, so that the using amount of rare earth permanent magnet materials can be reduced, the manufacturing cost of the motor is obviously reduced, the performance requirement of the rotor 100 is ensured, and the industrial requirement is met.
It should be noted that, in the circumferential direction of the first rotor core 10, the number and arrangement of the first permanent magnets 11 and the second permanent magnets 12 may be set according to actual requirements. In the embodiment that the first permanent magnet groups are multiple groups, the number of the first permanent magnets 11 in the multiple groups of first permanent magnet groups may be equal or unequal; in the embodiment where the second permanent magnet groups are multiple groups, the number of the second permanent magnets 12 in the multiple groups of the second permanent magnet groups may be equal or different.
For example, in some embodiments, in the circumferential direction of the first rotor core 10, the two first permanent magnets 11 and the two second permanent magnets 12 are arranged in an alternating order, that is, the first permanent magnet groups and the second permanent magnet groups are equal in number and are arranged at intervals along the circumferential direction of the first rotor core 10, each first permanent magnet group includes two first permanent magnets 11, and each second permanent magnet group includes two second permanent magnets 12.
In some embodiments, in the circumferential direction of the first rotor core 10, the three first permanent magnets 11 and the three second permanent magnets 12 are arranged in an alternating order, that is, the number of the first permanent magnet groups and the number of the second permanent magnet groups are equal and are arranged at intervals along the circumferential direction of the first rotor core 10, each first permanent magnet group includes three first permanent magnets 11, and each second permanent magnet group includes three second permanent magnets 12.
In some embodiments, in the circumferential direction of the first rotor core 10, the two first permanent magnets 11 and the one second permanent magnet 12 are arranged in an alternating order, that is, the first permanent magnet groups and the second permanent magnet groups are equal in number and are arranged at intervals along the circumferential direction of the first rotor core 10, each first permanent magnet group includes two first permanent magnets 11, and each second permanent magnet group includes one second permanent magnet 12.
In some embodiments, in the circumferential direction of the first rotor core 10, the first permanent magnets 11 and the two second permanent magnets 12 are arranged in an alternating order, that is, the first permanent magnet groups and the second permanent magnet groups are equal in number and are arranged at intervals along the circumferential direction of the first rotor core 10, each first permanent magnet group includes one first permanent magnet 11, and each second permanent magnet group includes two second permanent magnets 12.
In some embodiments, the first permanent magnets 11, the two second permanent magnets 12, the two first permanent magnets 11, and the one second permanent magnet 12 … … are arranged in a disordered arrangement manner in the circumferential direction of the first rotor core 10, that is, the first permanent magnet groups and the second permanent magnet groups are equal in number and are arranged at intervals in the circumferential direction of the first rotor core 10, the number of the first permanent magnets 11 in each first permanent magnet group is not equal, and may be one or two, and the number of the second permanent magnets 12 in each second permanent magnet group is not equal, and may be one or two.
For another example, in the example shown in fig. 3, the first permanent magnet groups are multiple groups, each group of the first permanent magnet groups includes one first permanent magnet 11, the number of the second permanent magnet groups is equal to that of the first permanent magnet groups, each group of the second permanent magnet groups includes one second permanent magnet 12, and the multiple groups of the first permanent magnet groups and the multiple groups of the second permanent magnet groups are distributed at intervals (or alternately arranged) along the circumferential direction of the first rotor core 10. In other words, the plurality of first core permanent magnets includes a plurality of first permanent magnets 11 and a plurality of second permanent magnets 12, and the plurality of first permanent magnets 11 and the plurality of second permanent magnets 12 are disposed alternately in the circumferential direction of the first rotor core 10, that is, alternately in the order of one first permanent magnet 11 and one second permanent magnet 12 … …. Therefore, in the circumferential direction of the rotor 100, a stronger magnetic field generated by the rare earth permanent magnet and a weaker magnetic field generated by the non-rare earth permanent magnet are alternately arranged, on one hand, the rare earth permanent magnet can better compensate the magnetic field of the non-rare earth permanent magnet, the uniformity of the magnetic field of the rotor 100 is better, and the problem that the non-rare earth permanent magnet is easy to demagnetize can be effectively solved, on the other hand, because the density of the non-rare earth permanent magnet is smaller, in order to improve the magnetic field performance, the volume of the non-rare earth permanent magnet can be designed to be slightly larger, the space size of the corresponding second permanent magnet 12 can be designed to be slightly larger, and the mode arranged in the middle of fig. 3 can prevent the second permanent magnet.
According to the rotor 100 of the motor of the embodiment of the invention, the first rotor core 10 is simultaneously provided with the rare earth permanent magnet and the non-rare earth permanent magnet, so that the use amount of the rare earth permanent magnet is reduced, the manufacturing cost is obviously reduced, and the first permanent magnet 11 and the second permanent magnet 12 are arranged in a radial manner extending along the radial direction of the first rotor core 10, so that the use amount of the rare earth permanent magnet is further reduced, the structural strength of the first rotor core 10 is improved, the remanence can be increased, and the demagnetization resistance is improved.
In some embodiments of the present invention, as shown in fig. 1 and 2, rotor 100 includes a multi-segment rotor core, which is stacked in an axial direction of rotor 100, and further includes second rotor core 20, that is, rotor 100 includes both first rotor core 10 and second rotor core 20. The rotor 100 further includes at least one third permanent magnet set and at least one fourth permanent magnet set. As shown in fig. 4, the third permanent magnet group and the fourth permanent magnet group are mounted on the second rotor core 20, and the third permanent magnet group and the fourth permanent magnet group are distributed at intervals along the circumferential direction of the second rotor core 20, in other words, in the circumferential direction of the second rotor core 20, the third permanent magnet group, the fourth permanent magnet group, the third permanent magnet group, and the fourth permanent magnet group … … are arranged in an alternating arrangement manner. Of course, in the embodiment in which the third permanent magnet group and the fourth permanent magnet group are both a group, the third permanent magnet group and the fourth permanent magnet group are arranged in the circumferential direction of the second rotor core 20.
Each third permanent magnet group comprises at least one third permanent magnet 21, each third permanent magnet 21 extends in the radial direction of the second rotor core 20, and in an embodiment in which the third permanent magnet group comprises a plurality of third permanent magnets 21, the plurality of third permanent magnets 21 are distributed in the circumferential direction of the second rotor core 20. Each set of fourth permanent magnet groups comprises at least one fourth permanent magnet 22. In other words, the third permanent magnet 21 and the fourth permanent magnet 22 provided in the same second rotor core 20 are distributed along the circumferential direction of the second rotor core 20.
As shown in fig. 4, the third permanent magnet 21 and the fourth permanent magnet 22 also form a parallel magnetic circuit by adopting a radial arrangement manner that extends along the radial direction of the second rotor core 20 and is distributed along the circumferential direction of the second rotor core 20, and the same technical effect as the radial arrangement manner of the first rotor core 10 is obtained, which is not described herein again.
As shown in fig. 4, the third permanent magnet 21 is a rare-earth permanent magnet such as neodymium iron boron (NdFeB), 1:5 rare-earth cobalt (1:5 type R-Co permanent magnet), 2:17 rare-earth cobalt (2:17 type R-Co permanent magnet), a rare-earth transition metal permanent magnet, a rare-earth iron-nitrogen permanent magnet alloy, or the like, and the fourth permanent magnet 22 is a non-rare-earth permanent magnet such as ferrite, alnico, a plastically deformable permanent magnet, or the like. The non-rare earth permanent magnet with low price and stable supply is combined with the rare earth permanent magnet with excellent electromagnetic performance, so that the using amount of rare earth permanent magnet materials can be reduced, the manufacturing cost of the motor is obviously reduced, the performance requirement of the rotor 100 is ensured, and the industrial requirement is met.
Furthermore, as shown in fig. 1 and 2, in the axial direction of the rotor 100, the at least one first permanent magnet 11 corresponds to the at least one fourth permanent magnet 22, i.e. the projection of the at least one first permanent magnet 11 and the at least one fourth permanent magnet 22 in the axial direction of the rotor 100 at least partially coincide, and the at least one second permanent magnet 12 corresponds to the at least one third permanent magnet 21, i.e. the projection of the at least one second permanent magnet 12 and the at least one third permanent magnet 21 in the axial direction of the rotor 100 at least partially coincide. Here, the polarities of the permanent magnet materials corresponding to each other in the axial direction of the rotor 100 are the same, and the polarities of the two adjacent permanent magnet materials are opposite to each other in the same rotor core.
It should be noted that, in the embodiment where the first rotor core 10 is provided with the plurality of first permanent magnets 11 and the plurality of second permanent magnets 12, and the second rotor core 20 is provided with the plurality of third permanent magnets 21 and the plurality of fourth permanent magnets 22, an axial projection of one first permanent magnet 11 and the fourth permanent magnet 22 corresponding to the same magnetic pole may at least partially coincide, or at least partially coincide with an axial projection of one part of the first permanent magnets 11 and the fourth permanent magnet 22 corresponding to the same magnetic pole, or at least partially coincide with an axial projection of all the first permanent magnets 11 and the fourth permanent magnets 22 corresponding to the same magnetic pole, respectively; the axial projections of one second permanent magnet 12 and the third permanent magnet 21 corresponding to the same magnetic pole may at least partially coincide, a part of the second permanent magnets 12 may at least partially coincide with the axial projections of the third permanent magnets 21 corresponding to the same magnetic pole, respectively, or all the second permanent magnets 12 may at least partially coincide with the axial projections of the third permanent magnets 21 corresponding to the same magnetic pole, respectively.
That is, in the axial direction of the rotor 100, the multi-stage rotor core is formed in an asymmetric distribution structure, the first permanent magnet 11 and the fourth permanent magnet 22 correspond to the same magnetic pole, and the second permanent magnet 12 and the third permanent magnet 21 correspond to the same magnetic pole. The rare earth permanent magnet and the non-rare earth permanent magnet correspond to each other, so that a stronger magnetic field generated by the rare earth permanent magnet compensates a weaker magnetic field generated by the non-rare earth permanent magnet in the axial direction of the rotor 100, and the symmetry of a magnetic circuit of the whole rotor 100 is favorably realized, compared with a rotor which totally adopts the rare earth permanent magnet, the motor performance (such as output torque) is basically unchanged or only slightly reduced (such as the output torque is reduced by 2.5-4.8%), but the production cost can be reduced by 10% -12%. The motor torque density and power density are ensured, the industrial requirements are met, the manufacturing cost is obviously reduced, the torque output characteristic is improved, the loss of the rotor 100 and eddy current is reduced, and the efficiency of the motor is improved.
For example, as shown in FIG. 7, a rotor 100 in which a rare earth permanent magnet and a non-rare earth permanent magnet shown in FIG. 1 are mixedly disposed with a pure rare earth permanent magnet according to the present inventionMoment angle diagram of rotor, wherein the average torque of rotor of pure rare earth permanent magnet is T1The average torque of the rotor 100 according to the embodiment of the present invention is T2And T is1-T2Is 3.7% T1Compared with the output torque of the rotor 100, the difference is negligible, the performance of the motor is minimally affected, but the amount of the required rare earth permanent magnet is obviously reduced, and the production cost is reduced by 11.5%.
According to the rotor 100 of the motor provided by the embodiment of the invention, the first permanent magnet 11 and the second permanent magnet 12 are arranged in a radial manner, the third permanent magnet 21 and the fourth permanent magnet 22 are arranged in a radial manner, and the axial projections of the rare earth permanent magnet and the non-rare earth permanent magnet are at least partially overlapped in the axial direction of the rotor 100, so that the magnetic field of the rotor 100 has symmetry through reasonable position arrangement, the torque output capacity is improved, the loss of the rotor 100 and eddy current is reduced, and the efficiency of the motor is improved.
In some embodiments of the present invention, the lengths of the second permanent magnet 12 and the first permanent magnet 11 are equal, and the width of the second permanent magnet 12 is wider than the width of the first permanent magnet 11, so that the volume of the second permanent magnet 12 is larger than the volume of the first permanent magnet 11, and the volume of the non-rare earth permanent magnet is larger, thereby increasing the output torque, and in the radial direction of the first rotor core 10, the widths of the magnetic bridges on both sides of the first permanent magnet 11 and the magnetic bridges on both sides of the second permanent magnet 12 are more uniform, which is beneficial to improving the symmetry of the magnetic field.
In some embodiments, the width ratio of the second permanent magnet 12 to the first permanent magnet 11 is 2.32-3.57, and the non-rare earth permanent magnet has a size in the range of the size that is large enough to ensure the output torque, and also to avoid the problem that the space (e.g., mounting groove) for mounting the second permanent magnet 12 is too large due to the oversize size of the second permanent magnet 12, which in turn causes the structural strength of the first rotor core 10 to be poor. For example, in some embodiments, the width ratio of the second permanent magnet 12 to the first permanent magnet 11 is 2.32, 2.5, 2.8, 3, 3.2, 3.57, etc.
In some embodiments, the first permanent magnet 11 has an aspect ratio of 6.85-7.96, such as 6.85, 7, 7.2, 7.4, 7.6, 7.8, 7.96, etc., and the second permanent magnet 12 has an aspect ratio of 4.65-5.02, such as 4.65, 4.7, 4.8, 4.9, 5.02, etc. Within the above size range, the output torque of the first permanent magnet 11 and the second permanent magnet 12 is made better, and the leakage flux is made less.
In some embodiments, as shown in FIG. 3, the first permanent magnet 11 has a length L and the first rotor core 10 has an outer diameter D, wherein D/L is 3.2 ≦ D/L ≦ 4.3. On the one hand, the magnetic bridge widths of the radial inner end and the radial outer end of the first permanent magnet 11 are made smaller to reduce magnetic leakage, and on the other hand, the first permanent magnet 11 is prevented from being oversized to cause poor structural strength of the first rotor core 10. In the embodiment that the lengths of the first permanent magnet 11 and the second permanent magnet 12 are equal, the sizes of the first permanent magnet 11 and the third permanent magnet 21 are the same, and the sizes of the second permanent magnet 12 and the fourth permanent magnet 22 are the same, the outer diameter D of the first rotor core 10 and the lengths L of the second permanent magnet 12, the third permanent magnet 21 and the fourth permanent magnet 22 also satisfy that D/L is greater than or equal to 3.2 and less than or equal to 4.3.
According to some embodiments of the invention, as shown in fig. 3 and 4, the first permanent magnets 11 and the second permanent magnets 12 are equal in number and spaced apart, in other words alternately arranged according to one first permanent magnet 11 and one second permanent magnet 12, and in the embodiment comprising the second rotor core 20, the corresponding third permanent magnets 21 and fourth permanent magnets 22 are equal in number and spaced apart, in other words alternately arranged according to one third permanent magnet 21 and one fourth permanent magnet 22. Therefore, in the circumferential direction of the rotor 100, a stronger magnetic field generated by the rare earth permanent magnet and a weaker magnetic field generated by the non-rare earth permanent magnet are alternately arranged, so that the uniformity of the magnetic field of the rotor 100 is better, the problem of easy demagnetization of the non-rare earth permanent magnet is effectively solved, and the structural strength of the first rotor core 10 and the second rotor core 20 is ensured.
In some embodiments of the present invention, the first permanent magnet 11 and the third permanent magnet 21 are the same size, and the second permanent magnet 12 and the fourth permanent magnet 22 are the same size. Therefore, only one kind of permanent magnet is required to be produced for the first permanent magnet 11 and the third permanent magnet 21, and only one kind of permanent magnet is required to be produced for the second permanent magnet 12 and the fourth permanent magnet 22, so that the production process can be obviously simplified, and the production cost can be reduced.
In some embodiments of the present invention, after first rotor core 10 rotates by a predetermined angle around the axis of rotor 100, axial projections of first permanent magnet 11 provided in first rotor core 10 and third permanent magnet 21 provided in second rotor core 20 completely coincide, and axial projections of second permanent magnet 12 provided in first rotor core 10 and fourth permanent magnet 22 provided in second rotor core 20 completely coincide.
Therefore, the shape and structure of the first rotor core 10 and the second rotor core 20 and the arrangement positions and arrangement structures of the permanent magnets are the same, only one type of rotor core needs to be produced during production, and when the rotor core is installed, the rotor core is rotated by a predetermined angle around the axis of the rotor 100 so that the first permanent magnet 11 of the previous rotor core and the second permanent magnet 12 of the next rotor core correspond to the same magnetic pole (for example, in the example shown in fig. 1, the next rotor core is installed by being rotated by 45 ° with respect to the previous rotor core), that is, the previous rotor core is formed as the first rotor core 10, and the next rotor core is formed as the second rotor core 20. The method has good manufacturability, the die opening is not repeated, the production process is effectively simplified, and the production cost is reduced.
It is understood that the predetermined angle of rotation of the first rotor core 10 around the axis of the rotor 100 is not particularly limited, for example, the predetermined angle of rotation may be an included angle between two adjacent permanent magnets, for example, 45 ° shown in fig. 1, and it is only necessary to satisfy the requirement that the first rotor core 10 and the second rotor core 20, the first permanent magnet 11 and the third permanent magnet 21, and the second permanent magnet 12 and the fourth permanent magnet 22 can be overlapped after rotating the predetermined angle.
In some embodiments of the present invention, as shown in fig. 1 and 3, the rotor 100 further includes a plurality of fifth permanent magnets 13, and the fifth permanent magnets 13 are mounted to the first rotor core 10 and extend in a circumferential direction of the first rotor core 10. Each fifth permanent magnet 13 is disposed between two adjacent first core permanent magnets in the circumferential direction of the first rotor core 10. For example, in an embodiment where two first permanent magnets 11 are adjacently disposed, one fifth permanent magnet 13 may be disposed between the two first permanent magnets 11; in the embodiment where two second permanent magnets 12 are adjacently disposed, a fifth permanent magnet 13 may be disposed between the two second permanent magnets 12; in an embodiment where the first permanent magnet 11 and the second permanent magnet 12 are disposed adjacent to each other, a fifth permanent magnet 13 may be disposed between the first permanent magnet 11 and the second permanent magnet 12.
In addition, the fifth permanent magnet 13 is a rare earth permanent magnet, which can effectively improve the exchange capability of electromagnetic properties, and further improve the demagnetization resistance of two sides of the permanent magnet. The fifth permanent magnets 13 and the first permanent magnet 11 or the second permanent magnet 12 form a series magnetic circuit, that is, two adjacent fifth permanent magnets 13 and the first permanent magnet 11 (or the second permanent magnet 12) between the two form the same closed magnetic circuit, and the parallel magnetic circuit of the series magnetic circuit and the radial permanent magnet is matched, so that the rotor 100 has the advantages of large torque, small magnetic flux leakage, difficult demagnetization of the permanent magnet of the series magnetic circuit, and also has the advantages of large air gap flux density, small torque ripple and the like of the parallel magnetic circuit.
In the embodiment of the present invention, the specific structure of the fifth permanent magnet 13 can be flexibly set according to the actual situation. For example, in some embodiments, the fifth permanent magnet 13 may extend in an arc shape along the circumferential direction of the first rotor core 10, so that the extending length of the fifth permanent magnet 13 is greater, which is beneficial to improve the magnetic performance, in this case, the length of the fifth permanent magnet 13 may be the chord length of the arc permanent magnet, and the width of the fifth permanent magnet 13 is the width of the arc permanent magnet in the radial direction of the first rotor core 10. In other embodiments, the fifth permanent magnet 13 may extend in a straight line shape in the circumferential direction of the first rotor core 10, in other words, the fifth permanent magnet 13 is a rectangular permanent magnet, the rectangular permanent magnet extends in the tangential direction of the first rotor core 10, the fifth permanent magnet 13 has a simpler structure and is easier to machine, the length of the fifth permanent magnet 13 is the length of the rectangular permanent magnet in the tangential direction of the first rotor core 10, and the width of the fifth permanent magnet 13 is the width of the rectangular permanent magnet in the radial direction of the first rotor core 10. In still other embodiments, the fifth permanent magnet 13 may extend in the circumferential direction of the first rotor core 10 to be a zigzag permanent magnet, such as a V-shaped permanent magnet shown in fig. 5, where the length of the fifth permanent magnet 13 is the sum of the lengths of two straight permanent magnets of the V-shaped permanent magnet, and the width of the fifth permanent magnet 13 is the width of the straight permanent magnet of the V-shaped permanent magnet.
In some embodiments, as shown in fig. 1 and 4, rotor 100 further includes a plurality of sixth permanent magnets 23, and sixth permanent magnets 23 are mounted to second rotor core 20 and extend in the circumferential direction of second rotor core 20. In the circumferential direction of the second rotor core 20, the sixth permanent magnet 23 may be provided between adjacent two third permanent magnets 21, between adjacent two fourth permanent magnets 22, or between adjacent third and fourth permanent magnets 21 and 22. The sixth permanent magnet 23, the third permanent magnet 21, and the fourth permanent magnet 22 may also form a series-parallel magnetic circuit, and have the same technical effects as the first permanent magnet 11, the second permanent magnet 12, and the fifth permanent magnet 13 on the first rotor core 10, which are not described herein again.
In some embodiments of the present invention, the sixth permanent magnet 23 may extend in the circumferential direction of the second rotor core 20 into an arc-shaped permanent magnet, a rectangular permanent magnet, or a dog-leg permanent magnet. In some embodiments, the sixth permanent magnet 23 and the fifth permanent magnet 13 correspond to the same magnetic pole in the axial direction of the rotor 100, and the sixth permanent magnet 23 and the fifth permanent magnet 13 have the same size, so as to simplify the structure of the rotor 100, simplify the production process, and reduce the production cost.
In some embodiments of the present invention, the length-to-width ratio of the fifth permanent magnet 13 is 5.13-6.26, and the length-to-width ratio of the sixth permanent magnet 23 is 5.13-6.26, and within the above size range, the output torque of the fifth permanent magnet 13 and the sixth permanent magnet 23 is better, and the leakage flux is less.
In some embodiments of the present invention, the arrangement positions of the fifth permanent magnet 13 and the sixth permanent magnet 23 can be flexibly set according to actual situations. Taking the first rotor core 10 as an example, as shown in fig. 5, a center line of the second permanent magnet 12 extending in the radial direction of the first rotor core 10 is od, a center line of the first permanent magnet 11 adjacent to the second permanent magnet 12 extending in the radial direction of the first rotor core 10 is oa, and a center line of the fifth permanent magnet 13 adjacent to the second permanent magnet 12 extending in the radial direction of the first rotor core 10 is oe. Wherein, the acute included angle between od and oe is α 1 and α 1 satisfies: alpha 1 is more than or equal to 20 degrees and less than or equal to 35 degrees, the acute included angle between oa and od is alpha 2, and alpha 2 meets the following requirements: 2 alpha 1 is less than or equal to alpha 2.
Therefore, the distance between the fifth permanent magnet 13 and the first permanent magnet 11 is equal to that between the fifth permanent magnet 13 and the second permanent magnet 12, so that the structure is symmetrical, the stress is uniform, or the fifth permanent magnet 13 is closer to the first permanent magnet 11, so that the fifth permanent magnet 13 is closer to the first permanent magnet 11, the magnetic leakage of the rare earth permanent magnet with the main magnetic property can be reduced, and the improvement of the output torque of the rotor 100 is facilitated. And in the above-mentioned angular range, the quantity of first permanent magnet 11, second permanent magnet 12 and fifth permanent magnet 13 is more suitable, and then the number of poles of rotor 100 can satisfy more industry demands. For example, in the specific example shown in fig. 2 and 5, the number of poles of the rotor 100 is eight, α 1 is 22.5 °, and α 2 is 45 °.
Since the fifth permanent magnet 13 generates a stronger torque than the first permanent magnet 11 during use, according to some embodiments of the present invention, the cross-sectional area ratio of the fifth permanent magnet 13 to the first permanent magnet 11 along the radial direction of the rotor 100 is 3.12 to 3.94, and the fifth permanent magnet 13 is larger than the first permanent magnet 11, which is beneficial to improving the effectiveness of the magnetic field of the rotor 100.
According to some embodiments of the present invention, as shown in fig. 1 and 6, rotor 100 includes a multi-segment rotor core, and the multi-segment rotor core is stacked along an axial direction of rotor 100, and includes a third rotor core 30, that is, rotor 100 includes both first rotor core 10 and third rotor core 30, and rotor 100 further includes a plurality of seventh permanent magnets 31, and seventh permanent magnets 31 are mounted to third rotor core 30 and extend in a radial direction of third rotor core 30, and the plurality of seventh permanent magnets 31 are distributed along a circumferential direction of third rotor core 30, and seventh permanent magnets 31 are rare-earth permanent magnets.
That is to say, the non-rare-earth permanent magnet is not disposed on the third rotor core 30, and the rare-earth permanent magnet of the third rotor core 30 can further compensate the non-rare-earth permanent magnet on the first rotor core 10, or the magnetic fields of the non-rare-earth permanent magnets on the first rotor core 10 and the second rotor core 20, so as to ensure the output torque, and further avoid demagnetization of the non-rare-earth permanent magnet.
For example, in an embodiment comprising only the first and third rotor cores 10, 30, the at least one seventh permanent magnet 31 at least partially coincides with an axial projection of the at least one first permanent magnet 11 and corresponds to one magnetic pole, and the at least one seventh permanent magnet 31 at least partially coincides with an axial projection of the at least one second permanent magnet 12 and corresponds to one magnetic pole. In the embodiment comprising the first rotor core 10, the second rotor core 20 and the third rotor core 30, at least a seventh permanent magnet 31 at least partially coincides with an axial projection of the at least one first permanent magnet 11 and the at least one fourth permanent magnet 22 and corresponds to a magnetic pole, and at least a seventh permanent magnet 31 at least partially coincides with an axial projection of the at least one second permanent magnet 12 and the at least one third permanent magnet 11 and corresponds to a magnetic pole.
In the embodiment of the present invention, the rotor 100 may include only the first rotor core 10 and the second rotor core 20, i.e., one of the first rotor cores 10 is disposed adjacent to the other of the first rotor cores 10 or the second rotor core 20; or only the first rotor core 10 and the third rotor core 30, i.e., one of the first rotor cores 10 is disposed adjacent to the other of the first rotor cores 10 or the third rotor core 30; or include the first rotor core 10, the second rotor core 20, and the third rotor core 30 at the same time, i.e., one of the first rotor cores 10 is disposed adjacent to the other of the first rotor core 10, the second rotor core 20, or the second rotor core 20. In other words, in the embodiment of the present invention, the first rotor core 10, the second rotor core 20, and the third rotor core 30 may be arranged in any combination. In the embodiment where the rotor 100 includes a multi-segment rotor core, the multi-segment rotor core may be connected by pressing at a self-fastening point, riveting with a rivet, or hinging with a special adhesive.
For example, in the axial direction of rotor 100, in some embodiments, the plurality of rotor cores are arranged in the arrangement of first rotor core 10, second rotor core 20, first rotor core 10, and second rotor core 20 … …;
in some embodiments, the multi-stage rotor cores are arranged in the arrangement of the first rotor core 10, the third rotor core 30, the first rotor core 10, and the third rotor core 30 … …;
in some embodiments, the multi-stage rotor cores are arranged in an arrangement of first, third, second, and first, third, and second rotor cores 10, 30, and 20 … …;
in some embodiments, the multi-stage rotor cores are arranged in an arrangement of first rotor core 10, first rotor core 10 … …, second rotor core 20 … …, third rotor core 30, and third rotor core 30 … …;
in some embodiments, the multi-stage rotor cores are arranged in an arrangement of first rotor core 10, first rotor core 10 … …, third rotor core 30 … …, second rotor core 20, and second rotor core 20 … …;
in some embodiments, the multi-stage rotor cores are arranged in an arrangement of first, second, third, first, second, third rotor cores 10, 20, 30, … …;
in some embodiments, the multi-stage rotor cores are arranged in an arrangement of first, second, third, and fourth rotor cores 10, 20, 30, 10, 20, 30, … …;
in some embodiments, the multi-stage rotor cores are arranged in a disordered arrangement of first rotor core 10, second rotor core 20, third rotor core 30, second rotor core 20, first rotor core 10, second rotor core 20, third rotor core 30, and first rotor core 10 … …;
in some embodiments, the multi-stage rotor cores are arranged in an arrangement of first rotor core 10, second rotor core 20, third rotor core 30, first rotor core 10, second rotor core 20, third rotor core 30 … …, and so on.
As shown in fig. 1 and 2, the first, second, and third rotor cores 10, 20, and 30 are arranged in an arrangement of the first, second, and third rotor cores 10, 20, 30, 10, 20, and 30 … …. In other words, one first rotor core 10, one second rotor core 20, and one third rotor core 30 are stacked in the axial direction of the rotor 100 to be disposed in a core group in which the second rotor core 20 is located between the first rotor core 10 and the third rotor core 30. The rotor 100 includes at least one core group, and when the core group is plural, the plural core groups are stacked in an axial direction of the rotor 100. In each iron core group, the first rotor iron core 10 and the second rotor iron core 20 which are asymmetric in axial structure and form a complementary structure are adjacently arranged, so that the magnetic field complementary effect of the first rotor iron core 10 and the second rotor iron core 20 is better, and further, the third rotor iron core 30 of the all-rare-earth permanent magnet is arranged on one side of the first rotor iron core 10, which is back to the second rotor iron core 20, and one side of the second rotor iron core 20, which is back to the first rotor iron core 10 when a plurality of iron core groups are stacked, so that the magnetic fields generated by the complementary structures of the first rotor iron core 10 and the second rotor iron core 20 are effectively compensated, the demagnetization is reduced, and the magnetic field distribution of each section of the rotor 100 in the axial direction is more uniform.
In some embodiments of the present invention, as shown with continued reference to fig. 1, the number of first rotor cores 10, second rotor cores 20, and third rotor cores 30 is equal, so that the distribution of the magnetic field is more uniformly distributed throughout the axial direction of rotor 100, particularly at the axial end portions of rotor 100.
In some embodiments of the present invention, as shown in fig. 3 to 6, in the core assembly, a center line of the first permanent magnet 11 extending in the radial direction of the rotor 100 is oa, a center line of the fourth permanent magnet 22 corresponding to the same magnetic pole as the first permanent magnet 11 extending in the radial direction of the rotor 100 is ob, and a center line of the seventh permanent magnet 31 corresponding to the same magnetic pole as the first permanent magnet 11 extending in the radial direction of the rotor 100 is oc. Wherein the acute included angle between oa and ob projected along the axial direction of the rotor 100 is 1-3 °, the acute included angle between ob and oc projected along the axial direction of the rotor 100 is 1-3 °, and the acute included angle between oa and oc projected along the axial direction of the rotor 100 is 2-6 °.
That is to say, in the axial direction of the rotor 10, the first rotor core 10 and the permanent magnet mounted on the first rotor core 10, the second rotor core 20 and the permanent magnet mounted on the second rotor core 20, the third rotor core 30 and the permanent magnet mounted on the third rotor core 30 cooperate to form a rotor 100 axial segmented skewed pole, so that the tooth harmonic is effectively weakened, the cogging torque and the torque ripple of the motor are improved, the torque ripple and the noise of the motor can be reduced, the length of each permanent magnet in the axial direction of the rotor 100 is reduced, and the installation is convenient.
For example, in some embodiments, the acute angle between the center lines of the first permanent magnet 11 and the fourth permanent magnet 22 corresponding to the same magnetic pole, that is, the acute angle between oa and ob may be 1 °, 1.5 °, 2 °, 2.5 °, 3 °, and the like, the acute angle between the center lines of the seventh permanent magnet 31 and the third permanent magnet 21 corresponding to the same magnetic pole, that is, the acute angle between oc and ob may be 1 °, 1.5 °, 2 °, 2.5 °, 3 °, and the like, and the acute angle between the center lines of the seventh permanent magnet 31 and the first permanent magnet 11 corresponding to the same magnetic pole, that is, the acute angle between oa and oc may be 2 °, 3 °, 4 °, 5 °, 6 °, and the like.
According to some embodiments of the present invention, as shown in fig. 6, rotor 100 further includes an eighth permanent magnet 32, where eighth permanent magnet 32 is installed to third rotor core 30 and extends in a circumferential direction of third rotor core 30, eighth permanent magnet 32 is a rare-earth permanent magnet, and eighth permanent magnet 32 is disposed between adjacent two seventh permanent magnets 31 in the circumferential direction of third rotor core 30. The eighth permanent magnet 32 can effectively improve the exchange capability of electromagnetic properties, and further improve the demagnetization resistance of both sides of the permanent magnet.
In some embodiments of the present invention, eighth permanent magnet 32 extends in a circumferential direction of third rotor core 30 as an arc-shaped permanent magnet, a rectangular permanent magnet, or a dog-leg permanent magnet. In some embodiments of the present invention, the size of the eighth permanent magnet 32 is the same as that of the fifth permanent magnet 13, and only one kind of permanent magnet needs to be produced during production, so that the production process is simplified, and the production cost is reduced.
In an embodiment of the present invention, the number of the first permanent magnets 11, the number of the second permanent magnets 12, the number of the third permanent magnets 21, and the fourth permanent magnets 22 may be equal and each be half of the number of poles of the rotor 100. Each magnetic pole on the first rotor core 10 shares a first permanent magnet 11 with one magnetic pole on one side in the circumferential direction thereof, the magnetic pole shares a second permanent magnet 12 with the other magnetic pole on the other side in the circumferential direction thereof, and one first permanent magnet 11 or one second permanent magnet 12 is located under each magnetic pole of the first rotor core 10. Each magnetic pole on the second rotor core 20 shares a third permanent magnet 21 with one magnetic pole on one side in the circumferential direction thereof, the magnetic pole shares a fourth permanent magnet 22 with the other magnetic pole on the other side in the circumferential direction thereof, and one third permanent magnet 21 or one fourth permanent magnet 22 is provided under each magnetic pole of the second rotor core 20. The number of required permanent magnets is reduced, and the rotor 100 has a simpler structure and higher structural strength.
In the embodiment of the present invention, the number of poles of the rotor 100 may be six or eight, so that the rotor 100 may meet the use requirements of more motors, and the size design of the corresponding first permanent magnet 11, second permanent magnet 12, third permanent magnet 21, fourth permanent magnet 22, fifth permanent magnet 13, and sixth permanent magnet 23 may also be more reasonable, so as to facilitate the improvement of the resultant torque.
The driving motor according to an embodiment of the present invention includes the rotor 100 of the motor according to an embodiment of the present invention. Since the rotor 100 of the motor according to the embodiment of the present invention has the above-mentioned advantageous technical effects, according to the driving motor according to the embodiment of the present invention, the rare earth permanent magnets and the non-rare earth permanent magnets are simultaneously disposed on the first rotor core 10, so that the amount of the rare earth permanent magnets is reduced, the manufacturing cost is significantly reduced, and the first permanent magnets 11 and the second permanent magnets 12 are arranged in a radial manner, so that the structural strength of the rotor 100 is improved, the remanence can be increased, and the demagnetization resistance can be improved.
A vehicle according to an embodiment of the present invention includes a drive motor according to an embodiment of the present invention. Since the driving motor according to the embodiment of the present invention has the above-mentioned advantageous technical effects, according to the vehicle according to the embodiment of the present invention, the rare earth permanent magnets and the non-rare earth permanent magnets are simultaneously disposed on the first rotor core 10, so that the amount of the rare earth permanent magnets is reduced, the manufacturing cost is significantly reduced, and the first permanent magnets 11 and the second permanent magnets 12 are arranged in a radial manner, so that the structural strength of the rotor 100 is improved, the remanence can be increased, and the demagnetization resistance can be improved.
Other constructions and operations of the driving motor, the rotor 100 and the vehicle according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean 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, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (23)

1. A rotor of an electric machine, the rotor comprising:
at least one segment of a rotor core, the at least one segment of the rotor core comprising a first rotor core;
the first permanent magnet groups are arranged on the first rotor core, each first permanent magnet group comprises at least one first permanent magnet, each first permanent magnet extends along the radial direction of the first rotor core, and when the first permanent magnet groups comprise a plurality of first permanent magnets, the first permanent magnets are distributed along the circumferential direction of the first rotor core;
at least one group of second permanent magnet groups, wherein the second permanent magnet groups are arranged on the first rotor core, the first permanent magnet groups and the second permanent magnet groups are distributed at intervals along the circumferential direction of the first rotor core, each group of the second permanent magnet groups comprises at least one second permanent magnet, each second permanent magnet extends along the radial direction of the first rotor core, and when the second permanent magnet groups comprise a plurality of the second permanent magnets, the second permanent magnets are distributed along the circumferential direction of the first rotor core,
the first permanent magnet is a rare-earth permanent magnet, and the second permanent magnet is a non-rare-earth permanent magnet.
2. The rotor of an electric machine of claim 1, wherein the first permanent magnet groups are in a plurality of groups, each group of the first permanent magnet groups includes one of the first permanent magnets, the second permanent magnet groups are equal in number to the first permanent magnet groups, and each group of the second permanent magnet groups includes one of the second permanent magnets.
3. The rotor of an electric machine according to claim 1, wherein the rotor includes a plurality of segments of the rotor core, the plurality of segments of the rotor core being stacked in an axial direction of the rotor, the plurality of segments of the rotor core further including a second rotor core,
the rotor further includes:
at least one third permanent magnet group, where the third permanent magnet group is installed on the second rotor core, each third permanent magnet group includes at least one third permanent magnet, each third permanent magnet extends along the radial direction of the second rotor core, and when the third permanent magnet group includes a plurality of third permanent magnets, the plurality of third permanent magnets are distributed along the circumferential direction of the second rotor core;
at least one group of fourth permanent magnet groups, wherein the fourth permanent magnet groups are arranged on the second rotor core, the third permanent magnet groups and the fourth permanent magnet groups are distributed at intervals along the circumferential direction of the second rotor core, each group of the fourth permanent magnet groups comprises at least one fourth permanent magnet, each fourth permanent magnet extends along the radial direction of the second rotor core, and when the fourth permanent magnet groups comprise a plurality of the fourth permanent magnets, the fourth permanent magnets are distributed along the circumferential direction of the second rotor core,
the third permanent magnet is a rare earth permanent magnet, the fourth permanent magnet is a non-rare earth permanent magnet,
in the axial direction of the rotor, the axial projections of at least one first permanent magnet and at least one fourth permanent magnet are at least partially overlapped, and the axial projections of at least one second permanent magnet and at least one third permanent magnet are at least partially overlapped.
4. The rotor of an electric machine of claim 3, wherein the first and third permanent magnets are the same size and the second and fourth permanent magnets are the same size.
5. The rotor of an electric machine according to claim 3, wherein after the first rotor core is rotated by a predetermined angle around the axis of the rotor, axial projections of the first permanent magnet provided in the first rotor core and the third permanent magnet provided in the second rotor core completely coincide with each other, and axial projections of the second permanent magnet provided in the first rotor core and the fourth permanent magnet provided in the second rotor core completely coincide with each other.
6. The rotor of an electric machine according to claim 1, wherein the rotor includes a plurality of segments of the rotor core, the plurality of segments of the rotor core being stacked in an axial direction of the rotor, the plurality of segments of the rotor core including a third rotor core,
the rotor further comprises a plurality of seventh permanent magnets, the seventh permanent magnets are mounted on the third rotor core and extend along the radial direction of the third rotor core, the plurality of seventh permanent magnets are distributed along the circumferential direction of the third rotor core, the seventh permanent magnets are rare-earth permanent magnets,
in the axial direction of the rotor, one of the first rotor cores is adjacent to the other first rotor core or the third rotor core, the axial projections of at least one of the seventh permanent magnets and at least one of the first permanent magnets are at least partially overlapped and correspond to the same magnetic pole, and the axial projections of at least one of the seventh permanent magnets and at least one of the second permanent magnets are at least partially overlapped and correspond to the same magnetic pole.
7. The rotor of an electric machine according to claim 3, wherein the rotor includes a plurality of segments of the rotor core, the plurality of segments of the rotor core being stacked in an axial direction of the rotor, the plurality of segments of the rotor core including a third rotor core,
the rotor further comprises a plurality of seventh permanent magnets, the seventh permanent magnets are mounted on the third rotor core and extend along the radial direction of the third rotor core, the plurality of seventh permanent magnets are distributed along the circumferential direction of the rotor, the seventh permanent magnets are rare-earth permanent magnets,
in the axial direction of the rotor, one of the first rotor cores is adjacent to the other first rotor core, the second rotor core or the third rotor core, the axial projections of at least one of the first permanent magnets, at least one of the fourth permanent magnets and at least one of the seventh permanent magnets are at least partially overlapped and correspond to the same magnetic pole, and the axial projections of at least one of the second permanent magnets, at least one of the third permanent magnets and at least one of the seventh permanent magnets are at least partially overlapped and correspond to the same magnetic pole.
8. The rotor of an electric machine according to claim 7, characterized in that the number of the first rotor cores, the second rotor cores, and the third rotor cores is equal.
9. The rotor of an electric machine according to claim 7, wherein one of said first rotor core, one of said second rotor core and one of said third rotor core are stacked in an axial direction of said rotor to constitute a core group in which said second rotor core is located between said first rotor core and said third rotor core,
the rotor includes a plurality of core groups stacked in an axial direction of the rotor.
10. The rotor of an electric motor according to claim 9, wherein in the core group, a center line of the first permanent magnet extending in the radial direction of the rotor is oa, a center line of the fourth permanent magnet corresponding to the same magnetic pole as the first permanent magnet extending in the radial direction of the rotor is ob, a center line of the seventh permanent magnet corresponding to the same magnetic pole as the first permanent magnet extending in the radial direction of the rotor is oc, an acute angle included angle between the oa and the ob in an axial projection of the rotor is 1 ° to 3 °, an acute angle included angle between the ob and the oc in an axial projection of the rotor is 1 ° to 3 °, and an acute angle included angle between the oa and the oc in an axial projection of the rotor is 2 ° to 6 °.
11. The rotor of an electric machine according to claim 1, characterized in that the second permanent magnets and the first permanent magnets extend with equal lengths in the radial direction of the first rotor core, and the width ratio in the tangential direction of the first rotor core is 2.32-3.57.
12. The rotor of an electric machine according to claim 1, characterized in that the ratio of the length of the first permanent magnet extending in the radial direction of the first rotor core to the width extending in the tangential direction of the first rotor core is 6.85-7.96, and the ratio of the length of the second permanent magnet extending in the radial direction of the first rotor core to the width extending in the tangential direction of the first rotor core is 4.65-5.02.
13. The rotor of an electric machine according to claim 1, characterized in that the first permanent magnets extend in the radial direction of the first rotor core over a length L, the first rotor core having an outer diameter D, wherein D/L is 3.2 ≦ D ≦ 4.3.
14. The rotor of an electric machine of claim 1, wherein the first and second permanent magnets are equal in number and spaced apart.
15. The rotor of an electric machine of claim 7, further comprising:
the fifth permanent magnet is arranged on the first rotor iron core and extends along the circumferential direction of the first rotor iron core, one fifth permanent magnet is arranged between the adjacent first permanent magnet and the second permanent magnet, between the adjacent two first permanent magnets or between the adjacent two second permanent magnets in the circumferential direction of the first rotor iron core, and the fifth permanent magnet is a rare earth permanent magnet.
16. The rotor of an electric machine according to claim 15, characterized in that the ratio of the length of the fifth permanent magnet in the circumferential direction of the first rotor core to the width in the radial direction of the first rotor core is 5.13-6.26.
17. The rotor of an electric machine according to claim 15, wherein a center line of the second permanent magnet extending in a radial direction of the first rotor core is od, a center line of the first permanent magnet adjacent to the second permanent magnet extending in the radial direction of the first rotor core is oa, a center line of the fifth permanent magnet adjacent to the second permanent magnet extending in the radial direction of the first rotor core is oe, an acute angle between od and oe is α 1, and α 1 satisfies: 20 DEG-alpha 1-35 DEG, the acute included angle between oa and od is alpha 2 and alpha 2 satisfies: 2 alpha 1 is less than or equal to alpha 2.
18. The rotor of an electric machine according to claim 15, wherein a cross-sectional area ratio of the fifth permanent magnet to the first permanent magnet in a radial direction of the rotor is 3.12 to 3.94.
19. The rotor of an electric machine of claim 15, further comprising:
the sixth permanent magnet is installed on the second rotor iron core and extends along the circumferential direction of the second rotor iron core, one sixth permanent magnet is arranged between the adjacent third permanent magnet and the fourth permanent magnet, between the adjacent two third permanent magnets or between the adjacent two fourth permanent magnets in the circumferential direction of the second rotor iron core, the sixth permanent magnet is a rare earth permanent magnet, and the sixth permanent magnet is the same as the fifth permanent magnet in size.
20. The rotor of an electric machine of claim 15, further comprising:
and the eighth permanent magnet is arranged on the third rotor core and extends along the circumferential direction of the third rotor core, and is arranged between every two adjacent seventh permanent magnets in the circumferential direction of the third rotor core, and is a rare earth permanent magnet, and the size of the eighth permanent magnet is the same as that of the fifth permanent magnet.
21. The rotor of an electric machine according to claim 1, characterized in that the number of the first permanent magnets and the number of the second permanent magnets are equal and are each half of the number of poles of the rotor, which is six or eight poles.
22. A drive motor, characterized by comprising a rotor of a motor according to any one of claims 1-21.
23. A vehicle characterized by comprising the drive motor according to claim 22.
CN201910944378.XA 2019-09-30 2019-09-30 Rotor of motor, driving motor and vehicle Active CN112583153B (en)

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CN201742192U (en) * 2010-07-08 2011-02-09 中国电子科技集团公司第二十一研究所 Tangential magnetic steel rotor structure of permanent magnet motor
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CN113949186A (en) * 2021-09-30 2022-01-18 南京航空航天大学 Few-harmonic alternating-pole hub motor
CN113949186B (en) * 2021-09-30 2023-03-14 南京航空航天大学 Few-harmonic alternating-pole hub motor

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