CN113054773B - Rotor subassembly, motor and domestic appliance - Google Patents
Rotor subassembly, motor and domestic appliance Download PDFInfo
- Publication number
- CN113054773B CN113054773B CN202110412213.5A CN202110412213A CN113054773B CN 113054773 B CN113054773 B CN 113054773B CN 202110412213 A CN202110412213 A CN 202110412213A CN 113054773 B CN113054773 B CN 113054773B
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- rotor
- shaft sleeve
- molded body
- injection molded
- injection molding
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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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention discloses a rotor assembly, a motor and a household appliance, wherein the rotor assembly comprises a shaft sleeve, a plurality of reinforcing bosses, a plurality of rotor cores and a plurality of permanent magnets, the shaft sleeve is made of a non-magnetic conducting material, the reinforcing bosses are arranged at intervals along the circumferential direction of the shaft sleeve, the rotor cores are arranged at intervals along the circumferential direction of the shaft sleeve, a mounting groove is formed between every two adjacent rotor cores, each rotor core comprises a protruding part, the protruding parts are connected with the shaft sleeve, a spacing distance is reserved between any two protruding parts, the permanent magnets are arranged in the mounting groove, and the permanent magnets and the rotor cores are sequentially and alternately arranged along the circumferential direction of the shaft sleeve. According to the rotor assembly provided by the embodiment of the invention, the magnetic flux of a magnetic circuit flowing through the rotor core and the shaft sleeve is effectively limited, so that the magnetic flux leakage phenomenon at the end part of the rotor is effectively reduced, the power density of the motor is improved, and the cost of the motor is reduced.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a rotor assembly, a motor and a household appliance.
Background
In the related technology, the built-in rotor core is generally made of magnetic conductive material by integral stamping, a larger part of magnetic flux generated by the permanent magnet passes through a rotor core sector part and circulates through a connecting part and a rotor shaft sleeve part (the protruding part and the rotor shaft sleeve are combined into a whole), the part of magnetic flux basically does not generate energy exchange for the motor, and does not generate electromagnetic torque, so that a larger end magnetic leakage phenomenon occurs, the power density of the motor is lower, and the cost of the motor is higher; the rotor connecting part is omitted, the rotor core assembly and the rotor shaft sleeve are integrally formed through injection molding, the magnetic leakage at the position can be effectively reduced, the structural strength is weaker, the motor is not suitable for the operation working condition of larger torque or higher rotating speed, and the application range of the motor is limited.
Disclosure of Invention
The present invention is directed to solving, at least in part, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a rotor assembly which solves the problem of end magnetic flux leakage and is high in structural strength.
The embodiment of the invention also provides a motor with the rotor assembly.
The embodiment of the invention also provides a household appliance with the motor.
The rotor assembly comprises a shaft sleeve, a plurality of reinforcing bosses, a plurality of rotor cores and a plurality of permanent magnets, wherein the shaft sleeve is made of a non-magnetic conductive material, the reinforcing bosses extend along the axial direction of the shaft sleeve and are connected with the shaft sleeve, the reinforcing bosses are arranged at intervals along the circumferential direction of the shaft sleeve, the rotor cores are arranged at intervals along the circumferential direction of the shaft sleeve, mounting grooves are formed between every two adjacent rotor cores, each rotor core comprises a protruding part, the protruding parts are connected with the shaft sleeve, a spacing distance is reserved between any two protruding parts, the permanent magnets are arranged in the mounting grooves and correspond to the reinforcing bosses one by one, and the permanent magnets and the rotor cores are sequentially and alternately arranged along the circumferential direction of the shaft sleeve.
According to the rotor assembly provided by the embodiment of the invention, the magnetic conductivity of the shaft sleeve is limited, and the distance is reserved between the convex parts of any two rotor cores, so that the magnetic flux of a magnetic circuit flowing through the rotor cores and the shaft sleeve is effectively limited, the magnetic flux leakage phenomenon at the end part of the rotor is effectively reduced, the power density of the motor is improved, the cost of the motor is reduced, in addition, the structural strength of the shaft sleeve is enhanced by arranging the reinforcing lug boss, the permanent magnet is more convenient to mount, and the form and position tolerance of each part of the rotor assembly is reduced.
In some embodiments, the peripheral wall of the shaft sleeve is provided with a plurality of limiting bosses, the limiting bosses extend along the axial direction of the shaft sleeve, and the permanent magnet and the rotor core are both located on the outer sides of the limiting bosses.
In some embodiments, the limiting bosses are divided into a plurality of pairs, the plurality of pairs of limiting bosses are arranged at intervals along the circumferential direction of the shaft sleeve, a first groove is formed between each pair of limiting bosses, a second groove is formed between two adjacent pairs of limiting bosses, the plurality of permanent magnets correspond to the plurality of pairs of limiting bosses one to one, and the protruding parts are clamped in the second grooves.
In some embodiments, the reinforcement boss is located within the first recess.
In some embodiments, the material of the reinforcing boss is a metal non-magnetic material, and the reinforcing boss is welded with the shaft sleeve.
In some embodiments, the fan-shaped portion and the connecting portion, one end of the connecting portion is connected to the fan-shaped portion, and the other end of the connecting portion is connected to the protruding portion.
In some embodiments, the circumferential profile of the cross-section of the sector comprises a plurality of segments of a curve that are end-to-end in sequence and are substantially arcuate.
In some embodiments, the rotor assembly further includes an injection molded body, and the shaft sleeve, the reinforcing boss, the rotor core, the permanent magnet, and the injection molded body are integrally injection molded.
In some embodiments, the injection molded body includes a first injection molded body, a second injection molded body, and a connection injection molded body, the first injection molded body is disposed at one end of the shaft sleeve in the axial direction, the second injection molded body is disposed at a second end of the shaft sleeve in the axial direction, and the first injection molded body and the second injection molded body are connected through the connection injection molded body.
In some embodiments, the connection injection molding body comprises a first connection injection molding body, a second connection injection molding body and a third connection injection molding body, injection molding holes are formed in the rotor cores, the injection molding holes extend along the axial direction of the rotor cores, the first connection injection molding body is filled in the injection molding holes, the second connection injection molding body is filled in the first grooves and gaps between the permanent magnets and the limiting bosses, and the third connection injection molding body is filled in a space defined by two adjacent rotor cores and one ends, far away from the shaft sleeve, of the permanent magnets between the two adjacent rotor cores.
In some embodiments, the injection-molded body is provided with a plurality of balancing holes, the balancing holes extend along the axial direction of the injection-molded body, and the balancing holes are arranged at intervals along the circumferential direction of the injection-molded body.
In some embodiments, the rotor core is provided with positioning holes extending in an axial direction of the rotor core.
Embodiments of the present invention also provide an electric machine including the rotor assembly according to any of the above embodiments.
The embodiment of the invention also provides a household appliance, which comprises the motor in the embodiment.
Drawings
FIG. 1 is a schematic view of a rotor assembly according to an embodiment of the present invention;
FIG. 2 is a side view of a rotor assembly according to an embodiment of the present invention;
FIG. 3 is a B-B cross-sectional view of the rotor assembly shown in FIG. 1;
FIG. 4 is a cross-sectional A-A view of the rotor assembly shown in FIG. 2;
fig. 5 is a partial enlarged view at C shown in fig. 4;
FIG. 6 is a schematic view of a bushing of a rotor assembly according to an embodiment of the present invention;
fig. 7 is a schematic view of a rotor core of a rotor assembly according to an embodiment of the present invention;
fig. 8 is a schematic view of a permanent magnet of a rotor assembly according to an embodiment of the present invention.
Reference numerals:
the shaft sleeve 1, a limit boss 11, a first groove 12, a second groove 13, a reinforcing boss 14,
the permanent magnets 3 are arranged in such a way that,
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A rotor assembly provided according to some embodiments of the present invention is described below with reference to fig. 1-8.
As shown in fig. 1 to 4, a rotor assembly according to an embodiment of the present invention includes a shaft sleeve 1, a reinforcing boss 14, a rotor core 2, and a permanent magnet 3, wherein the shaft sleeve 1 is substantially cylindrical, the reinforcing boss 14, the rotor core 2, and the permanent magnet 3 are connected to the shaft sleeve 1, the reinforcing boss 14, the rotor core 2, and the permanent magnet 3 are located on a peripheral side of the shaft sleeve 1, the reinforcing boss 14 extends in an axial direction of the shaft sleeve 1 and is connected to the shaft sleeve 1, the plurality of reinforcing bosses 14 are arranged at intervals in a circumferential direction of the shaft sleeve 1, a cross-sectional shape of the reinforcing boss 14 may be triangular or polygonal, and the reinforcing boss 14 may increase a structural strength of the shaft sleeve 1.
A plurality of permanent magnets 3 and a plurality of bosses 14 of strengthening one-to-one correspond, strengthen the boss 14 and can improve support and spacing effect to permanent magnet 3 for permanent magnet 3 installs more conveniently, and each spare part form and position tolerance of rotor subassembly is littleer relatively, and the motor uniformity is also higher.
As shown in fig. 8, the plurality of permanent magnets 3 and the plurality of rotor cores 2 are alternately arranged in sequence in the circumferential direction of the sleeve 1. Specifically, a plurality of rotor cores 2 are arranged at intervals along the circumferential direction of the shaft sleeve 1, a mounting groove is formed between two adjacent rotor cores 2, and the permanent magnet 3 is fixed in the mounting groove and corresponds to the reinforcing boss 14. Each rotor core 2 is independent, and the sheet metal is more easily and reasonably arranged during blanking so as to greatly reduce blanking waste.
The shaft sleeve 1 is made of a non-magnetic material, the magnetic permeability of the non-magnetic material is weak, and magnetic flux of a magnetic circuit flowing through the shaft sleeve 1 can be limited, so that magnetic flux leakage is reduced.
Further, all be equipped with bulge 23 on every rotor core 2, rotor core 2 links to each other with axle sleeve 1 through bulge 23, prevents that rotor centrifugal force is too big when high-speed rotatory to lead to rotor core 2 and axle sleeve 1 to take place to warp or break away from, all has the spacing distance between the bulge 23 of two arbitrary rotor cores 2, promptly, all do not contact each other between the bulge 23. With this arrangement, the magnetic flux of the magnetic circuit flowing through the rotor core 2 can be effectively restricted.
According to the rotor assembly provided by the embodiment of the invention, the magnetic conductivity of the shaft sleeve 1 is limited, and the distance between the convex parts 23 of any two rotor cores 2 is set, so that the magnetic flux of a magnetic circuit flowing through the rotor cores 2 and the shaft sleeve 1 is effectively limited, the magnetic flux leakage phenomenon at the end part of the rotor is effectively reduced, the power density of a motor is improved, the cost of the motor is reduced, in addition, the structural strength of the shaft sleeve 1 is enhanced by arranging the reinforcing boss 14, the permanent magnet 3 is more convenient to mount, and the form and position tolerance of each part of the rotor assembly is reduced.
Furthermore, the reinforcing boss 14 is made of a metal non-magnetic-conducting material, and the reinforcing boss 14 is connected with the shaft sleeve 1 in a welding mode, so that the connecting cavity section between the boss 14 and the shaft sleeve 1 can be effectively reinforced, and the structural strength of the shaft sleeve 1 is improved.
As shown in fig. 6, in some embodiments, the outer peripheral wall of the shaft sleeve 1 is provided with a plurality of limiting bosses 11, the limiting bosses 11 extend along the axial direction of the shaft sleeve 1, the number of the limiting bosses 11 is multiple, the permanent magnet 3 and the rotor core 2 are both located outside the limiting bosses 11, it should be noted that the end surface of one end of the permanent magnet 3 adjacent to the shaft sleeve 1 corresponds to the limiting bosses 11, and the rotor core 2 is connected to the limiting bosses 11 in a clamping manner.
Specifically, the limiting bosses 11 are divided into a plurality of pairs, the plurality of pairs of limiting bosses 11 are arranged at intervals along the circumferential direction of the shaft sleeve 1, and the plurality of permanent magnets 3 are connected with the plurality of pairs of limiting bosses 11 in a one-to-one correspondence manner, that is, each permanent magnet 3 is connected with one pair of limiting bosses 11.
Each pair of limiting bosses 11 comprises two limiting bosses 11, and the two limiting bosses 11 in each pair of limiting bosses 11 have a spacing distance therebetween, so that a first groove 12 is formed between each pair of limiting bosses 11.
As shown in FIG. 6, in some embodiments, the reinforcing protrusions 14 are located in the first grooves 12, and at least one reinforcing protrusion 14 is located in each first groove 12, so that the reinforcing protrusions 14 can better support and limit the permanent magnet.
Two limiting bosses 11 in each pair of limiting bosses 11 extend towards the direction far away from the other limiting boss 11, in other words, two limiting bosses 11 extend towards the side far away from the first groove 12, so that a second groove 13 is formed between two adjacent pairs of limiting bosses 11, the cross section area of the part, close to the shaft sleeve 1, of the second groove 13 is large, the cross section area of the part far away from the shaft sleeve 1 is small, the shape of the second groove 13 of the bulge 23 is corresponding to that of the second groove 13, and the bulge 23 is clamped in the second groove 13, so that the connection strength between the rotor core 2 and the shaft sleeve 1 is ensured.
As shown in fig. 7, the rotor core 2 further includes a sector 21 and a connecting portion 22, the sector 21 is substantially in a sector shape, and the outer peripheral profile of the cross section of the sector 21 includes multiple sections of curves which are sequentially connected end to end and is substantially in an arc shape, and the outer peripheral profile of the cross section can be regarded as a portion corresponding to the arc section of the sector shape.
The connecting portion 22 has a rectangular cross section, one end of the connecting portion 22 in the longitudinal direction is connected to the fan portion 21, and the other end of the connecting portion 22 in the longitudinal direction is connected to the protruding portion 23.
It should be noted that, the size of the sector 21 in the radial direction of the shaft sleeve 1 is larger than the size of the permanent magnet 3 in the radial direction of the shaft sleeve 1, two ends of the sector 21 extend outward to form two protrusions, and the protrusions of two adjacent sectors 21 clamp the permanent magnet 3 between the two rotor cores 2, so as to prevent the permanent magnet 3 from coming off due to a large centrifugal force.
In some embodiments, the rotor assembly further comprises an injection molding body 4, the shaft sleeve 1, the rotor core 2, the permanent magnet 3 and the injection molding body 4 are integrally injection molded, the rotor assembly combined together through an injection molding process is stronger in structural strength, and the rotor assembly can be widely applied to working conditions with larger motor torque or higher rotating speed.
Specifically, injection molding body 4 includes first injection molding body 41, second injection molding body 42, connects injection molding body 43, and first injection molding body 41 is established at the ascending one end of axle sleeve 1 axial, and second injection molding body 42 is established at the ascending second end of axle sleeve 1 axial, connects injection molding body 43 and runs through rotor core 2, and first injection molding body 41 and second injection molding body 42 link to each other through connecting injection molding body 43, and consequently, rotor core 2, axle sleeve 1 and permanent magnet 3 integrated injection moulding through injection moulding structure, rotor assembly's structural strength is high.
Further, the connection injection molded body 43 comprises a first connection injection molded body 431, a second connection injection molded body 432 and a third connection injection molded body 433, the sector portion 21 of the rotor core 2 is provided with an injection molded hole 25, the injection molded hole 25 extends along the axial direction of the rotor core 2, and the first connection injection molded body 431 is filled in the injection molded hole 25; the second connection injection molding body 432 is filled in the first groove 12 and a gap between the permanent magnet 3 and the limiting boss 11, and the permanent magnet 3 is connected with the shaft sleeve 1 through the second connection injection molding body 432; the third connection injection molding body 433 is filled in a space defined by two adjacent rotor cores 2 and one end, far away from the shaft sleeve 1, of the permanent magnet 3 located between the two adjacent rotor cores 2, and it can be understood that the third connection injection molding body 433 is an injection molding body 4 at a notch.
It should be noted that, a certain deformation may be generated due to a large centrifugal force when the rotor rotates at a high speed, and in order to avoid the excessive deformation, it is necessary to ensure that the outer diameter of the injection molded body 4 is less than or equal to the outer contour of the rotor core 2, and therefore, the thickness of the injection molded body 4 at the notch is generally thin, and the structural strength is weak, so that the first connection injection molded body 431 and the second connection injection molded body 432 need to be added, and the first connection injection molded body 431, the second connection injection molded body 432 and the third connection injection molded body 433 are all used for enhancing the strength of the injection molded body 4, so as to avoid the failure deformation of the injection molded body 4 due to the excessive centrifugal force when the rotor rotates at a high speed.
The first recess 12 makes it possible to increase the amount of the first connection injection molded body 431, thereby increasing the overall strength of the injection molded body 4. The cross-sectional shape of the first groove 12 may be a polygon, a circle, an ellipse or a combination of shapes, or may be a multi-groove structure or a non-groove structure, and the combination of shapes helps to balance the contradiction between the magnetic resistance and the positioning accuracy.
The cross section of the injection molding hole 25 can be a polygon, a circle, an ellipse or a combination of various shapes, the fan-shaped part 21 of the rotor core 2 is a passage through which the motor magnetic flux mainly flows, the injection molding hole 25 is positioned in the fan-shaped part 21, the width of the passage through which the motor magnetic flux mainly flows is effectively reduced, the motor magnetic resistance is increased, the motor power density is reduced, but the first connection injection molding body 431 passes through the first injection molding hole 25, and the structural strength of the rotor can be further improved. By defining the shape of the cross-section of the injection-molded hole 25, it is possible to simultaneously balance the contradiction between the magnetic circuit reluctance and the structural strength of the injection-molded body 4.
In some embodiments, the first injection-molded body 41 and the second injection-molded body 42 are provided with a plurality of balancing holes 44, the balancing holes 44 extend along the axial direction of the first injection-molded body 41 and the second injection-molded body 42, and the balancing holes 44 are arranged at intervals along the circumferential direction of the first injection-molded body 41 and the second injection-molded body 42. By mounting the balance weight to the balance hole 44, the amount of dynamic unbalance of the rotor can be limited, and the electromagnetic noise generated by the dynamic unbalance of the rotor can be reduced.
In some embodiments, the rotor core 2 is provided with positioning holes 24, and the positioning holes 24 extend along the axial direction of the rotor core 2, and can be positioned through the positioning holes 24 during powder metallurgy or injection molding, so that the form and position tolerance of each component is reduced, and the additional tangential torque pulsation is reduced.
The cross-sectional shape of the positioning hole 24 may be polygonal, circular, elliptical, or a combination of shapes, which helps to balance the contradiction between magnetic resistance and positioning accuracy.
Embodiments of the present invention also provide an electric machine including the rotor assembly according to any of the above embodiments.
The embodiment of the invention also provides a household appliance, which comprises the motor in the embodiment.
Specifically, the rotor assembly solves the problem that the traditional built-in rotor generates larger end magnetic flux leakage when magnetic flux flows, improves the power density of the motor, and greatly reduces the cost of the motor; the problem of lower structural strength of the rotor is solved, and the shaft sleeve 1 and the rotor core 2 are integrally formed by adopting a powder metallurgy process, the protruding part 23 and the shaft sleeve 1 are firmly combined together, and the structural strength of the rotor is stronger than that of the rotor which is formed by arranging the shaft sleeve 1 and the rotor core 2 at a distance and only combining the shaft sleeve 1 and the rotor core 2 by an injection molding process, so that the rotor can be widely applied to the working conditions of larger motor torque or higher rotating speed; the problem of low utilization rate of built-in rotor structural materials is solved, and as the rotor cores 2 are independent from each other, the sheet materials are more easily and reasonably arranged during blanking so as to greatly reduce blanking waste; the adoption of the powder metallurgy material has less waste, and meets the national purpose of saving.
Further, in order to solve the problem of serious magnetic flux leakage when the built-in rotor magnetic flux passes through the shaft sleeve 1 with stronger magnetic permeability, the shaft sleeve 1 is separated from the rotor iron core 2, and the shaft sleeve 1 adopts a metal non-magnetic-conductive plate, so that the problem of serious magnetic flux leakage at the position of the shaft sleeve 1 is effectively reduced; finally, the rotor core 2, the shaft sleeve 1, the welding reinforcing boss 14 and the permanent magnet 3 are integrally formed through injection molding, so that the structural strength of the rotor assembly is improved; furthermore, in order to improve the structural strength of the injection molded body 4, the rotor shaft sleeve 1 and the rotor structure are provided with injection molding holes 25, and the injection molding holes 25 can be injection molded through plastic packaging materials to fix the rotor core 2, the shaft sleeve 1, the reinforcing boss 14 and the permanent magnet 3. The rotor core 2 is provided with a plurality of positioning holes 24, and the rotor core 2 is positioned by adopting an injection molding process.
In a traditional built-in rotor structure, magnetic steel is generally magnetized first and then assembled, namely, a single piece of magnetic steel is magnetized, both the magnetic steel and a rotor iron core are magnetic, the assembly is very difficult, and after the magnetic rotor structure is assembled and injection molded, a plurality of permanent magnets 3 fine particles and scrap iron are usually adsorbed on the surface of the magnetic rotor, so that the magnetic rotor structure is difficult to clean; if the rotor assembly is assembled and then injected, namely the whole magnetizing is carried out, the problems can be well solved, but the magnetic conductivity of the shaft sleeve of the traditional built-in rotor structure is strong, the magnetic leakage is large, and the whole magnetizing saturation rate is low, the shaft sleeve 1 adopts the metal non-magnetic-conductive plate, the magnetic leakage at the position of the shaft sleeve 1 can be effectively reduced, the whole magnetizing saturation rate of the rotor assembly is improved, and the motor performance is further improved.
To the great problem of current rotor core rotor shaft sleeve department circulation magnetic leakage, this application provides a rotor subassembly. Compared with the traditional built-in rotor, the scheme obviously increases the magnetic circuit reluctance of the shaft sleeve 1 part, effectively reduces the magnetic leakage at the position, and has more reliable structure and higher material utilization rate. The enhancement boss 14 in the first recess 12 of axle sleeve 1 can firmly be fixed with axle sleeve 1, and the bulge 23 of rotor core 2 also plays better support and limiting displacement to permanent magnet 3 simultaneously, and it is more convenient that permanent magnet 3 installs, and each spare part geometric tolerances of rotor is littleer relatively, and the motor uniformity is also higher.
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 devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. A rotor assembly, comprising:
the shaft sleeve is made of a non-magnetic conductive material, and a metal non-magnetic conductive plate is adopted as the shaft sleeve;
the reinforcing bosses extend along the axial direction of the shaft sleeve and are connected with the shaft sleeve, and the reinforcing bosses are arranged at intervals along the circumferential direction of the shaft sleeve;
the rotor cores are arranged at intervals along the circumferential direction of the shaft sleeve, a mounting groove is formed between every two adjacent rotor cores, each rotor core comprises a protruding portion, the protruding portions are connected with the shaft sleeve, and a spacing distance is reserved between any two protruding portions;
the permanent magnets are arranged in the mounting groove and correspond to the reinforcing bosses one by one, and the permanent magnets and the rotor cores are sequentially and alternately arranged along the circumferential direction of the shaft sleeve;
the periphery wall of axle sleeve is equipped with a plurality of spacing bosss, spacing boss divide into many pairs, and is many right spacing boss is followed the circumference interval arrangement of axle sleeve is every to form first recess between the spacing boss, adjacent two pairs form the second recess between the spacing boss, and is a plurality of the permanent magnet is with many right spacing boss one-to-one, the bulge joint is in the second recess.
2. The rotor assembly of claim 1, wherein the limiting boss extends in the axial direction of the shaft sleeve, and the permanent magnet and the rotor core are located outside the limiting boss.
3. The rotor assembly of claim 1 wherein the reinforcement boss is located within the first recess.
4. The rotor assembly of claim 3 wherein the reinforcing tab is made of a metallic non-magnetic material and is welded to the bushing.
5. The rotor assembly of claim 1 wherein the rotor core further comprises a sector and a connecting portion, one end of the connecting portion being connected to the sector and the other end of the connecting portion being connected to the projection.
6. The rotor assembly of claim 5 wherein the outer circumferential profile of the cross-section of the sector comprises a plurality of segments of a curve that follow one another end to end and are generally arcuate.
7. The rotor assembly of claim 1 further comprising an injection molded body, wherein the bushing, the reinforcing boss, the rotor core, the permanent magnet, and the injection molded body are integrally injection molded.
8. The rotor assembly of claim 7 wherein the injection molded body comprises a first injection molded body, a second injection molded body, and a connection injection molded body, the first injection molded body is disposed at one end of the shaft sleeve in the axial direction, the second injection molded body is disposed at a second end of the shaft sleeve in the axial direction, and the first injection molded body and the second injection molded body are connected by the connection injection molded body.
9. The rotor assembly according to claim 8, wherein the connection injection molding body comprises a first connection injection molding body, a second connection injection molding body and a third connection injection molding body, injection molding holes are formed in the rotor cores, the injection molding holes extend along the axial direction of the rotor cores, the first connection injection molding body is filled in the injection molding holes, the second connection injection molding body is filled in the first grooves and in gaps between the permanent magnets and the limiting bosses, and the third connection injection molding body is filled in a space defined by two adjacent rotor cores and one ends, far away from the shaft sleeve, of the permanent magnets between the two adjacent rotor cores.
10. The rotor assembly of claim 7, wherein the injection molded body is provided with a plurality of balance holes, the balance holes extend along an axial direction of the injection molded body, and the balance holes are arranged at intervals along a circumferential direction of the injection molded body.
11. The rotor assembly of claim 1 wherein the rotor core has a locating hole therein, the locating hole extending axially of the rotor core.
12. An electrical machine comprising a rotor assembly according to any one of claims 1 to 11.
13. A household appliance, characterized in that it comprises an electric machine according to claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110412213.5A CN113054773B (en) | 2021-04-16 | 2021-04-16 | Rotor subassembly, motor and domestic appliance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110412213.5A CN113054773B (en) | 2021-04-16 | 2021-04-16 | Rotor subassembly, motor and domestic appliance |
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| CN113054773A CN113054773A (en) | 2021-06-29 |
| CN113054773B true CN113054773B (en) | 2022-08-16 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957237A (en) * | 2011-08-22 | 2013-03-06 | 德昌电机(深圳)有限公司 | Brushless motor and motor rotor thereof |
| JP2018014772A (en) * | 2016-07-19 | 2018-01-25 | 三菱電機株式会社 | Permanent magnet motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN202455179U (en) * | 2012-02-02 | 2012-09-26 | 珠海格力电器股份有限公司 | Built-in tangential type permanent magnetic rotor |
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| CN204304645U (en) * | 2014-12-26 | 2015-04-29 | 中山大洋电机制造有限公司 | The DC brushless motor of a kind of p-m rotor and application thereof |
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| CN106712348A (en) * | 2016-12-27 | 2017-05-24 | 威灵（芜湖）电机制造有限公司 | Rotor core, rotor and motor with same |
| CN108718124B (en) * | 2018-05-31 | 2020-06-30 | 广东威灵电机制造有限公司 | Rotor core, rotor and motor |
| CN108711980B (en) * | 2018-07-13 | 2023-12-05 | 卧龙电气集团股份有限公司 | Block type iron core IPM plastic package forming rotor |
| CN212033850U (en) * | 2020-01-21 | 2020-11-27 | 淮安威灵电机制造有限公司 | Rotor core and injection molding rotor with same |
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| CN102957237A (en) * | 2011-08-22 | 2013-03-06 | 德昌电机(深圳)有限公司 | Brushless motor and motor rotor thereof |
| JP2018014772A (en) * | 2016-07-19 | 2018-01-25 | 三菱電機株式会社 | Permanent magnet motor |
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| CN113054773A (en) | 2021-06-29 |
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