CN212162960U - Motor outer rotor, brushless permanent magnet motor and electric product - Google Patents
Motor outer rotor, brushless permanent magnet motor and electric product Download PDFInfo
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- CN212162960U CN212162960U CN202021180380.9U CN202021180380U CN212162960U CN 212162960 U CN212162960 U CN 212162960U CN 202021180380 U CN202021180380 U CN 202021180380U CN 212162960 U CN212162960 U CN 212162960U
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Abstract
The embodiment of the application provides a motor outer rotor, brushless permanent-magnet machine and electric product, and this motor outer rotor includes: the connecting portion is located the first inner tube portion, the outer tube portion of the radial outside of first inner tube portion and radially connects first inner tube portion and outer tube portion, and the connecting portion has: a plurality of first web portions extending in a direction away from the first inner tube portion from one axial side of the outer circumferential surface of the first inner tube portion; a plurality of second web portions extending in a direction away from the first inner tube portion from the other axial side of the outer peripheral surface of the first inner tube portion, the plurality of second web portions being arranged at intervals in the circumferential direction from the plurality of first web portions; and a plurality of axial connecting portions that extend from the outer peripheral surface of the first inner tube portion in a direction away from the first inner tube portion, and connect the first and second web portions in the axial direction. The motor outer rotor of the embodiment of the application has the advantages of simple structure, high strength and rigidity, uniform air gap between the stator and the rotor of the motor and reduction of the running noise of the motor.
Description
Technical Field
The application relates to the field of motors, in particular to an outer rotor of a motor, a brushless permanent magnet motor and an electric product.
Background
At present, brushless permanent magnet outer rotor type motors are more and more popular in application to washing machines, and particularly, such motors are applied to direct drive type washing machines on a large scale, the radial size of the outer rotor type motors becomes larger and larger, the size of the outer rotor is also larger and larger, the requirement for the spin-drying speed of the direct drive type washing machines is also higher and higher, and the requirement for the design of the rotor of the outer rotor type motors is higher and higher.
At present, the permanent magnet outer rotor adopts two structural types:
one is formed by drawing a metal plate, magnetic steel is adhered to the inner cylindrical surface of a metal plate shell through anaerobic adhesive or epoxy adhesive, and a spline sleeve matched with a washing machine is integrated with a rotor by adopting an assembling or injection molding method.
The other is injection molding, for example, the injection molding is made of thermal plastic or thermosetting plastic, in the method, the rotor magnetic conduction ring, the magnetic steel and the spline housing are directly used as inserts, and the whole rotor is formed by an injection molding or compression molding method, so that the product molding processing period is short, and the production efficiency is high. However, the injection molded rotor must be designed reasonably to meet the use performance of the rotor, so that the rotor has good physical properties, mechanical properties and structural and technological properties, and the deformation and warpage caused by the injection molding of the rotor are reduced, so that a high-benefit and high-quality product can be produced.
It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.
SUMMERY OF THE UTILITY MODEL
The inventor finds that the process of the sheet metal drawing-molded rotor shell is complex, the product precision is poor, in order to ensure the concentricity of the inner surface of the magnetic steel and the spline hub, the spline hub needs to be assembled by adopting an injection molding method, in addition, the magnetic steel is poor in environmental protection and manufacturability by adopting a glue pasting method, the magnetic steel can fall off along with the increase of the temperature and the rotating speed when the motor operates, and the stability of the rotor product is poor. The injection molding rotor adopts the modeling design of radial reinforcement , and the outer rotor motor is easy to resonate with a washing machine barrel during operation, so that large noise and vibration are caused, and the mold structure is complex and the cavity is not easy to manufacture. In addition, when the method of thermosetting plastic injection or compression molding is adopted, the production efficiency of the rotor is low, the product rejection rate is high, the thermosetting plastic cannot be recycled, and the environmental protection property is poor.
In order to solve at least one of the above problems or other similar problems, embodiments of the present application provide an outer rotor of a motor, a brushless permanent magnet motor having the outer rotor of the motor, and an electrical product having the motor.
According to an aspect of the embodiments of the present application, there is provided an outer rotor of an electric machine, including: a first inner cylindrical portion, an outer cylindrical portion located radially outward of the first inner cylindrical portion, and a connecting portion connecting the first inner cylindrical portion and the outer cylindrical portion in a radial direction, the connecting portion having:
a plurality of first web portions extending in a direction away from the first inner tube portion from one axial side of an outer peripheral surface of the first inner tube portion;
a plurality of second web portions extending in a direction away from the first inner tube portion from the other axial side of the outer peripheral surface of the first inner tube portion, the plurality of second web portions being arranged at intervals in the circumferential direction from the plurality of first web portions; and
a plurality of axial connecting portions that extend from an outer peripheral surface of the first inner tubular portion in a direction away from the first inner tubular portion and connect the first and second web portions in an axial direction.
In some embodiments, the connecting portion further has:
an annular portion located on a side of the plurality of first and second web portions that is away from the first inner tube portion, and an end portion on an axially lower side of the outer tube portion being connected to an edge on a radially outer side of the annular portion.
In some embodiments, the connecting portion further has:
the cylindrical ring is located between the annular portion and the second web portions in the radial direction, and the end portion of one side of the first inner cylinder portion and the end portion of one side of the axial connecting portion are connected to the inner circumferential surface of the cylindrical ring.
In some embodiments, a recess recessed toward an axially lower side is formed in an axially upper side of the first web portion, and a surface of the recess is formed as a torus.
In some embodiments, the connecting portion further has:
a second inner tube section located radially inward of the first inner tube section; and
a radial connecting portion that radially connects the first inner tube portion and the second inner tube portion.
In some embodiments, the plurality of first web portions, the plurality of second web portions, and the plurality of axial connecting portions are formed in a wave shape or a zigzag shape in a circumferential direction.
In some embodiments, the first and second web portions are each formed in a sector shape.
In some embodiments, the axial connection portion is formed in a curved surface shape.
In some embodiments, the axial connecting portion is formed in a straight surface shape, and intersects the first web portion and/or the second web portion perpendicularly or obliquely at an obtuse angle.
In some embodiments, a circumferential width of a radially inner side of the first web portion is the same as a circumferential width of a radially inner side of the second web portion; a circumferential width of a radially outer side of the first web portion is the same as a circumferential width of a radially outer side of the second web portion.
In some embodiments, a through hole is provided in the ring-shaped portion and/or the axial connection portion and/or the first web portion and/or the second web portion.
In some embodiments, the through-hole extends from a position of the first web portion and/or the second web portion near the first inner tube portion to a direction away from the first inner tube portion up to a position of the ring portion near the outer tube portion.
According to another aspect of embodiments of the present application, there is provided a brushless permanent magnet motor, wherein the brushless permanent magnet motor includes:
an outer rotor for an electric machine as claimed in any preceding embodiment; and
a stator located radially inward of the rotor and disposed opposite the rotor.
According to a further aspect of embodiments of the present application, there is provided an electrical product, wherein the electrical product comprises the aforementioned brushless permanent magnet motor.
One of the beneficial effects of the embodiment of the application lies in: the rotor has simple structure, the magnetic steel is positioned and distributed reasonably, the strength and the rigidity of the rotor are high, the utilization rate of materials is improved, the internal stress and the deformation warpage caused by the injection molding of the rotor are effectively reduced, and the product quality of the rotor is improved; the air gaps of the stator and the rotor of the motor are uniform, and the running noise of the motor is effectively reduced.
Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
Elements and features described in one drawing or one implementation of an embodiment of the application may be combined with elements and features shown in one or more other drawings or implementations. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts for use in more than one embodiment.
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 (a), (b), (c) and (d) are schematic views of an example of an outer rotor of a motor of an embodiment of the present application;
fig. 2 (a), (b), (c) and (d) are schematic views of another example of the outer rotor of the motor of the embodiment of the present application;
fig. 3 (a), (b), (c) and (d) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application;
fig. 4 (a), (b), (c) and (d) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application;
fig. 5 (a), (b) and (c) are schematic views of another example of the outer rotor of the motor of the embodiment of the present application;
fig. 6 (a), (b), (c) and (d) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application;
fig. 7 (a), (b), (c) and (d) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application;
fig. 8 is a schematic view of the concave-convex shape formed in the circumferential direction by the first web portion, the second web portion, and the axial connecting portion;
fig. 9 (a), (b) and (c) are schematic views of another example of the outer rotor of the motor of the embodiment of the present application;
fig. 10 (a), (b) and (c) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application;
fig. 11 (a), (b) and (c) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application;
fig. 12 (a), (b), (c) and (d) are schematic views of another example of the outer rotor of the motor of the embodiment of the present application;
fig. 13 is a schematic view of a brushless permanent magnet motor according to an embodiment of the present application.
Detailed Description
The foregoing and other features of embodiments of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the following description and drawings, particular embodiments of the present application are disclosed in detail as being indicative of some of the embodiments in which the principles of the embodiments of the application may be employed, it being understood that the embodiments of the application are not limited to the embodiments described, but, on the contrary, the embodiments of the application include all modifications, variations and equivalents falling within the scope of the appended claims.
In the following description of the embodiments of the present application, for the sake of convenience of description, a direction parallel to a direction extending along a central axis of a rotor is referred to as "axial direction", a radial direction centering on the central axis is referred to as "radial direction", a direction surrounding the central axis is referred to as "circumferential direction", a side away from the central axis in the radial direction is referred to as "radially outer side", a side closer to the central axis in the radial direction is referred to as "radially inner side", one axial side is referred to as "axially upper side", and the other axial side is referred to as "axially lower side", but this is for the sake of convenience of description only, and does not limit the orientation of the rotor and the motor when used and manufactured.
Various embodiments of the present application will be described below with reference to the drawings. These embodiments are merely exemplary and are not intended to limit the embodiments of the present application.
Embodiments of the first aspect
The embodiment of the application provides an outer rotor of a motor.
Fig. 1 (a), (b), (c) and (d) are schematic views of an example of an outer rotor of a motor according to an embodiment of the present application, and fig. 1 (a) shows a case of one axial side of the outer rotor of the motor; fig. 1 (b) shows the case of the other axial side of the outer rotor of the motor; fig. 1 (c) shows a section of the outer rotor of the motor; fig. 1 (d) shows another cross section of the outer rotor of the motor.
As shown in fig. 1, in the embodiment of the present application, the outer rotor of the motor includes: the inner tube section 10 includes a first inner tube section 10, an outer tube section 20 located radially outward of the first inner tube section 10, and a connecting section 30 connecting the first inner tube section 10 and the outer tube section 20 in the radial direction.
In the present embodiment, as shown in fig. 1, the connecting portion 30 has a plurality of first web portions 31, a plurality of second web portions 32, and a plurality of axial connecting portions 33. Each of the first web portions 31 extends from one side of the outer peripheral surface of the first inner tube portion 10 in the axial direction away from the first inner tube portion 10, each of the second web portions 32 extends from the other side of the outer peripheral surface of the first inner tube portion 10 in the axial direction away from the first inner tube portion 10, each of the axial connecting portions 33 extends from the outer peripheral surface of the first inner tube portion 10 in the axial direction away from the first inner tube portion 10, and connects the first web portions 31 and the second web portions in the axial direction.
According to the outer rotor of the motor, the connecting portion 30 connecting the first inner cylinder portion 10 and the outer cylinder portion 20 is formed into a structure which is arranged in a concave-convex interval mode in the circumferential direction, the heights of radial plates on the inner side and the outer side of the rotor are increased, the air flowing speed in the motor is increased, outside air flows into the motor through the gaps of the stator windings, the heat of a stator of the motor is taken away, and the temperature rise of the motor is effectively reduced. And because there is not the design of leaking out between axial connecting portion and radials portion, so both can form the water conservancy diversion structure of similar fan for the rotor can produce radial air flow at rotatory in-process, thereby can effectively reduce the motor and heat up.
In the embodiment of the present application, the first inner cylinder 10 may include a structure cooperating with a shaft of the motor, which may be referred to as a spline or a spline housing, and reference may be made to the related art with respect to a specific structure thereof, which is not limited by the present application.
In the embodiment of the present application, the outer cylinder 20 may include a portion interacting with a stator of the motor, for example, the outer cylinder 20 may include magnetic steel, a magnetic conductive ring, and the like, and the present application is not limited with respect to the combination manner of the outer cylinder 20 and the magnetic steel and the magnetic conductive ring, and reference may be made to the related art.
In the embodiment of the present application, the first inner tube portion 10, the outer tube portion 20, and the connection portion 30 may be formed by metal press molding, casting molding, plastic molding, or any combination thereof, and the forming method is not limited in the present application.
According to the embodiment of the application, the rotor formed in the mode is simple in production process, high in production efficiency, small in production equipment and required labor force quantity and small in occupied workshop space, so that the product cost is low, and the product quality is high.
Fig. 2 (a), (b), (c) and (d) are schematic views of another example of the outer rotor of the motor of the embodiment of the present application, and unlike the example of fig. 1, in the example of fig. 2, the connection portion 30 includes an annular portion 34 in addition to the first and second web portions 31 and 32 and the axial connection portion 33. As shown in fig. 2, the annular portion 34 is located on the side of the plurality of first web portions 31 and the plurality of second web portions 32 away from the first inner tubular portion 10, and the axially lower end portion of the outer tubular portion 20 connects the radially outer edge of the annular portion 34.
That is, the ring-shaped portion 34 is located between the outer tube portion 20 and the web portions (the first web portion 31 and the second web portion 32), and the web portions and the axial connecting portion 33 do not extend to the outer tube portion 20 but extend to the ring-shaped portion 34. That is, the annular portion 34 is located radially outward of the radially outer ends of the first and second web portions 31, 32 and the axial connecting portion 33, and is formed annularly. In some embodiments, as shown in fig. 2, the second web portion 32 and the annular portion 34 may have no height difference, i.e., they are in the same plane, thereby accelerating the air flow, but the present application is not limited thereto.
By providing the annular portion 34, the flow speed of the air inside the motor can be further increased, and a heat dissipation effect can be further achieved.
In the embodiment of the present invention, the positions of the radially inner end of the first web portion 31 and the radially inner end of the second web portion 32 on the outer peripheral surface of the first inner tubular portion 10 are not limited, and fig. 2 shows a case where the radially inner end of the first web portion 31 is located on the axially upper side of the outer peripheral surface of the first inner tubular portion 10 and the radially inner end of the second web portion 32 is located on the axially lower side of the outer peripheral surface of the first inner tubular portion 10, but the radially inner end of the first web portion 31 may be located on the axially upper side of the outer peripheral surface of the first inner tubular portion 10 and the radially inner end of the second web portion 32 may be located on the axially lower side of the outer peripheral surface of the first inner tubular portion 10, as long as the first web portion 31 and the second web portion 32 form a height difference on the radially inner side.
Fig. 3 (a), (b), (c), and (d) are schematic views of another example of the outer rotor of the motor according to the embodiment of the present application, and unlike the example of fig. 2, in the example of fig. 3, the radially inner end of the first web portion 31 is located at a position below the outer circumferential surface of the first inner cylindrical portion 10 in the axial direction (see fig. 3 (a)), and the radially inner end of the second web portion 32 is located at a position above the outer circumferential surface of the first inner cylindrical portion 10 in the axial direction (see fig. 3 (b)), whereby the connection portion 30 can also be configured to be disposed at intervals of projections and recesses in the circumferential direction.
Fig. 4 (a), (b), (c), and (d) are schematic views of another example of the outer rotor of the motor of the embodiment of the present application, and unlike the example of fig. 3, in the example of fig. 4, the connection portion 30 includes a cylindrical ring 35 in addition to the first web portion 31, the second web portion 32, the axial connection portion 33, and the annular portion 34. As shown in fig. 4, the cylindrical ring 35 is located between the annular portion 34 and the plurality of second web portions 32 in the radial direction, and an end portion of the plurality of first web portions 31 on the side away from the first inner tube portion 10 (a radial outer end of the first web portion 31) and an end portion of the axial connecting portion 33 on the side away from the first inner tube portion 10 (a radial outer end of the axial connecting portion 33) are connected to an inner peripheral surface of the cylindrical ring 35. That is, the cylindrical ring 35 is provided around the first and second web portions 31 and 32 and the radially outer end of the axial connecting portion 33, and is formed in a ring shape having a certain height in the axial direction.
By the design of the cylindrical ring 35, the first web portion 31 can be connected with the second web portion 32 at the radial outer side, which enhances the strength and rigidity of the rotor.
In some embodiments, as shown in fig. 4, the axial height of the cylindrical ring 35 is less than the axial height of the first inner barrel 10. This allows the first web portion 31 to have a difference in axial height between the radially inner side and the radially outer side, and the strength and rigidity of the rotor can be further enhanced.
In some embodiments, as shown in fig. 4 (d), the position P1 where the axial connecting portion 33 connects with the first web portion 31 and the position P2 where the axial connecting portion 33 connects with the second web portion 32 transition through an arc. Thereby, the air flow is facilitated.
Fig. 5 (a), (b) and (c) are schematic views of still another example of the motor outer rotor of the embodiment of the present application, and unlike the example of fig. 4, in the example of fig. 5, the motor outer rotor further includes a second inner cylindrical portion 40 and a radial connection portion 50. As shown in fig. 5, the second inner tube portion 40 is located radially inward of the first inner tube portion 10, and the radial connecting portion 50 connects the first inner tube portion 10 and the second inner tube portion 20 in the radial direction, and for example, the radial connecting portion 50 includes a plurality of reinforcing ribs provided in the circumferential direction, each of which extends from the inner circumferential surface of the first inner tube portion 10 in a direction away from the first inner tube portion 10 to the outer circumferential surface of the second inner tube portion 40, thereby forming the radial connecting portion 50.
By forming the second inner cylindrical portion 40 and the radial connecting portion 50, the strength of the rotor can be enhanced.
Fig. 6 (a), (b), (c) and (d) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application, and as shown in fig. 6, in some embodiments, the plurality of first web portions 31, the plurality of second web portions 32, and the plurality of axial connecting portions 33 are formed in a wavy shape in the circumferential direction. In this example, the second web portion 32 is not in the same plane as the annular portion 34, and there is no distinct boundary between the first web portion 31, the second web portion 32, and the axial connecting portion 33 (see (d) of fig. 6).
By forming the connecting portion 30 in a wave shape, the web connecting the inner and outer cylindrical portions can be formed in a concave-convex distribution, and the air flow can be accelerated in the same manner.
Fig. 7 (a), (b), (c), and (d) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application, and unlike the example of fig. 6, in the example of fig. 7, the plurality of first web portions 31, the plurality of second web portions 32, and the plurality of axial connecting portions 33 are formed in a zigzag shape in the circumferential direction. In this example, the second web portion 32 is also out of the same plane as the annular portion 34, and there is no distinct boundary between the first web portion 31, the second web portion 32, and the axial connecting portion 33 (see fig. 7 (d)).
By designing the connecting portion 30 to have a zigzag shape, the web connecting the inner and outer cylindrical portions can be formed into a concave-convex distribution, and the air flow can be accelerated in the same manner.
The examples of fig. 6 and 7 are only illustrative, and in the embodiment of the present application, the plurality of first web portions 31, the plurality of second web portions 32, and the plurality of axial connecting portions 33 may also be formed in other shapes in the circumferential direction, and fig. 8 shows several possible shapes, but the present application is not limited thereto.
Fig. 9 (a), (b) and (c) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application, and unlike the example of fig. 2, in the example of fig. 9, a recess 36 recessed toward the axial lower side is formed on the axial upper side of the first spoke portion 31, and the surface of the recess 36 is formed as a torus.
Through the design of the concave curved surface, the strength and the rigidity of the rotor are enhanced, and the running noise of the motor is reduced.
In the embodiment of the present application, the forming position and the number of the concave portions 36 are not limited, and for example, the concave portions 36 may be formed at a position substantially in the middle in the radial direction of the first web portion 31, or may be formed at a position close to the inner side in the radial direction or a position close to the outer side in the radial direction of the first web portion 31, and the number of the concave portions 36 formed in each first web portion 31 may be one as shown in fig. 9, or may be another number. The design of the recess 36 is optional, and in other embodiments, the recess 36 may not be provided.
Fig. 10 (a), (b) and (c) are schematic views of still another example of the outer rotor of the motor of the embodiment of the present application, and unlike the example of fig. 2, in the example of fig. 10, through holes 37 extending in the radial direction are formed in the first and second web portions 31 and 32, and the through holes 37 extend in the radial direction up to the annular portion 34.
The through-hole 37 is provided to perform a heat radiation function, and the through-hole 37 may be referred to as a heat radiation hole.
In some embodiments, as shown in fig. 10, the through holes 37 extend from a position of the first web portion 31 and/or the second web portion 32 close to the first inner tube portion 10 to a direction away from the first inner tube portion 10 to a position of the annular portion 34 close to the outer tube portion 20. This facilitates formation of the through-hole 37.
Fig. 10 illustrates an example in which the through-holes 37 are formed in the first web portion 31, the second web portion 32, and the annular portion 34, but the present invention is not limited to this, and the through-holes 37 may be formed only in the first web portion 31, only in the second web portion 32, only in the annular portion 34, or in any combination of the first web portion 31, the second web portion 32, and the annular portion 34.
Fig. 10 illustrates the through-hole 37 as a long through-hole, but the present invention is not limited thereto, and the through-hole 37 may be a circular through-hole or a through-hole having another shape.
Fig. 11 (a), (b) and (c) are schematic views of another example of the outer rotor of the motor of the embodiment of the present application, and unlike the example of fig. 9, in the example of fig. 11, the connection portion 30 has a cylindrical ring 35 and a through hole 37 in addition to the first web portion 31, the second web portion 32, the axial connection portion 33, the annular portion 34, and the recess 36. In the example of fig. 11, the through-hole 37 is a circular through-hole and is formed in the annular portion 34.
In fig. 11, a circular through hole 37 is formed in the annular portion 34 as an example, but the present invention is not limited to this, and the circular through hole 37 may be formed only in the first web portion 31, only in the second web portion 32, or in any combination of the first web portion 31, the second web portion 32, and the annular portion 34.
Fig. 12 (a), (b), (c) and (d) are schematic views of another example of the outer rotor of the motor of the embodiment of the present application, and unlike the example of fig. 11, in the example of fig. 12, the connection portion 30 includes the first web portion 31, the second web portion 32, the axial connection portion 33, the annular portion 34, the cylindrical ring 35, and the recess portion 36, but does not include the through hole 37 described above.
Further, as shown in fig. 12 (d), the outer rotor of the motor may further include a magnetic conductive ring 60, a magnetic steel 70, and a spline housing 80 fitted to the first inner cylinder 10. The present application does not limit the arrangement of the magnetic conductive ring 60, the magnetic steel 70, and the spline housing 80, and as shown in fig. 12 (d), other arrangements are also possible, for example, the spline housing 80 may be formed integrally with the first inner cylinder 10, and so on, and the description thereof is omitted here.
In the present embodiment, in some embodiments, as shown in fig. 1 to 5 and 9 to 12, the first and second web portions 31 and 31 are respectively formed in a fan shape. Thus, heat dissipation is facilitated.
In some embodiments, the axial connection portion 33 is formed in a curved shape, that is, the axial connection portion 33 is an arc surface when viewed from the side, thereby facilitating the flow of air.
In some embodiments, the axial connection portion 33 is formed in a straight surface shape, that is, the axial connection portion 33 is a plane, and the axial connection portion 33 intersects the first and/or second web portions 31 and 32 perpendicularly or obliquely at an obtuse angle or intersects through a circular arc transition, and so on. The present application is not limited to the manner in which the axial connection portion 33 is connected to the first and/or second web portions 31, 32, and fig. 8 illustrates several possible manners, but the present application is not limited thereto.
In the present embodiment, in some embodiments, as shown in fig. 1 to 5 and 9 to 12, the circumferential width of the radially inner side of the first web portion 31 is the same as the circumferential width of the radially inner side of the second web portion 32; the circumferential width of the radially outer side of the first web portion 31 is the same as the circumferential width of the radially outer side of the second web portion 32. That is, the first and second web portions 31 and 32 are formed in the same shape.
With this structure, since the first and second web portions 31 and 32 are alternately designed in the circumferential direction, the strength and rigidity of the rotor are enhanced and the operating noise of the motor is reduced by designing both of them in substantially the same triangular shape. In addition, the present application is not limited to this, and the first and second web portions 31 and 32 may not have substantially the same shape, and for example, the circumferential widths of the radially inner side and the radially outer side of both may be different from each other, so that the strength and rigidity of the rotor can be enhanced, and the operating noise of the motor can be reduced.
The above embodiments are merely illustrative of the embodiments of the present application, but the present application is not limited thereto, and appropriate modifications may be made on the basis of the above embodiments. For example, the above-described embodiments may be used alone, or one or more of the above-described embodiments may be combined.
For example, in the examples of fig. 1, 4, and 5, the recess 36 and/or the through hole 37 may be provided, and specifically, the description about the recess 36 and/or the through hole 37 in fig. 9 to 12 may be referred to.
For another example, in the example of fig. 2 and 3, a cylindrical ring 35 and/or a recess 36 and/or a through hole 37 may be provided, and specifically, reference may be made to the description of fig. 4 and fig. 9 to 12 regarding the cylindrical ring 35, the recess 36 and/or the through hole 37.
For another example, in the example of fig. 9, the cylindrical ring 35 and/or the through hole 37 may be provided, and specifically, the description about the cylindrical ring 35 and/or the through hole 37 in fig. 4 and fig. 10 to 12 may be referred to.
As another example, in the example of fig. 10, a cylindrical ring 35 may be provided, and reference may be made specifically to the description of fig. 4 regarding the cylindrical ring 35.
For another example, in the examples of fig. 1 to 4 and 6 to 12, the second inner tube portion 40 may be provided, and specifically, the description about the second inner tube portion 40 in fig. 5 may be referred to.
In the present embodiment, the connecting portion 30 may have a uniform thickness design in some embodiments.
With this configuration, the radial reinforcement for increasing rotor strength and the large openings in the rotor are eliminated and the overall injection molded structure is designed to be of uniform material thickness. Through the design of inside and outside both sides radials in turn, including the thick design of the material of homogeneous, reasonable drawing die inclination and fillet radius, the big problem of product internal stress that the shrink is inhomogeneous when having reduced moulding plastics caused has reduced product deformation and warpage, and the rotor finished product is little with full run-out with stator tooth complex magnet steel inner cylinder circularity, and the concentricity at spline housing center is good, therefore electric motor rotor and stator motor air gap are very even, have reduced vibration and noise when the motor operates.
It should be noted that fig. 1 to fig. 12 above only schematically illustrate the outer rotor of the motor in the embodiment of the present application, but the present application is not limited thereto, and the specific content of each structure or component can also refer to the related art; further, structures or components not shown in fig. 1 to 12 may be added, or one or more structures or components in fig. 1 to 12 may be reduced. Reference may be made to the related art for elements or components not specifically identified in fig. 1 through 12, which are not limited in this application.
The outer rotor of the embodiment of the application has good physical properties, mechanical properties and structural and technological properties, completely meets the requirements of scale use in the fields of household appliances and the like, and has a wide application prospect.
Embodiments of the second aspect
The embodiment of the application provides a brushless permanent magnet motor.
Fig. 13 is a schematic view of a brushless permanent magnet motor according to an embodiment of the present application.
As shown in fig. 13, the brushless permanent magnet motor includes a rotor 100 and a stator 200, where the stator 200 is located at a radial inner side of the rotor 100 and is disposed opposite to the rotor 100 in a radial direction, and the structure of the stator 200 is not limited in this application, and reference may be specifically made to related technologies, which are not described herein again; the rotor 100 is an outer rotor of the motor in the embodiment of the first aspect, and since the structure of the outer rotor of the motor has been described in detail in the embodiment of the first aspect, details are not repeated here.
It should be noted that fig. 13 above is only schematic illustration of the motor of the embodiment of the present application, but the present application is not limited thereto, and the specific content of each structure or component can also refer to the related art; further, structures or components not shown in FIG. 12 may be added, or one or more structures or components in FIG. 13 may be reduced. Reference may be made to the related art for components or elements not specifically identified in fig. 13, which is not intended to be limiting in this application.
The motor of the embodiment of the application adopts the outer rotor of the embodiment of the first aspect, has good physical properties, mechanical properties and structural and technological properties, completely meets the requirements of scale use in the fields of household appliances and the like, and has wide application prospects.
Examples of the third aspect
Embodiments of a third aspect of the present application provide an electrical product. The electric product is provided with the motor in the embodiment of the second aspect, the motor is provided with the outer rotor in the embodiment of the first aspect, the outer rotor is simple in structure, the magnetic steel is reasonably positioned and distributed, the strength and the rigidity of the rotor are high, the utilization rate of materials is improved, the internal stress and deformation warpage caused by rotor injection molding are effectively reduced, and the product quality of the rotor is improved; the air gaps of the stator and the rotor of the motor are uniform, and the running noise of the motor is effectively reduced.
In the embodiment of the present application, the electrical product may be any electrical product including a motor, and for example, may be a washing machine, a vacuum cleaner (sweeper), a refrigerator (compressor), an air conditioner (indoor unit, outdoor unit), a blower, a stirrer, an oxygen pump, a vehicle-mounted product such as a power steering system, and the like. Alternatively, the motor may be used as a motor in various information devices, industrial devices, and the like.
The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.
Claims (14)
1. An outer rotor for an electric machine, comprising: a first inner cylindrical portion, an outer cylindrical portion located radially outward of the first inner cylindrical portion, and a connecting portion connecting the first inner cylindrical portion and the outer cylindrical portion in a radial direction, wherein the connecting portion includes:
a plurality of first web portions extending in a direction away from the first inner tube portion from one axial side of an outer peripheral surface of the first inner tube portion;
a plurality of second web portions extending in a direction away from the first inner tube portion from the other axial side of the outer peripheral surface of the first inner tube portion, the plurality of second web portions being arranged at intervals in the circumferential direction from the plurality of first web portions; and
a plurality of axial connecting portions that extend from an outer peripheral surface of the first inner tubular portion in a direction away from the first inner tubular portion and connect the first and second web portions in an axial direction.
2. The outer rotor of claim 1, wherein the connection portion further comprises:
an annular portion located on a side of the plurality of first and second web portions that is away from the first inner tube portion, and an end portion on an axially lower side of the outer tube portion being connected to an edge on a radially outer side of the annular portion.
3. The outer rotor of claim 2, wherein the connection portion further comprises:
the cylindrical ring is located between the annular portion and the second web portions in the radial direction, and the end portion of one side of the first inner cylinder portion and the end portion of one side of the axial connecting portion are connected to the inner circumferential surface of the cylindrical ring.
4. The outer rotor of an electric machine according to any one of claims 1-3, wherein a recess recessed toward an axially lower side is formed in an axially upper side of the first web portion, and a surface of the recess is formed as a torus.
5. The electric machine outer rotor of any of claims 1-3, wherein the connection portion further comprises:
a second inner tube section located radially inward of the first inner tube section; and
a radial connecting portion that radially connects the first inner tube portion and the second inner tube portion.
6. The electric machine outer rotor of any one of claims 1 to 3, wherein the plurality of first web portions, the plurality of second web portions, and the plurality of axial connecting portions are formed in a wave shape or a zigzag shape in a circumferential direction.
7. The outer rotor of an electric machine according to any one of claims 1-3, wherein the first and second web portions are each formed in a sector shape.
8. The outer rotor of claim 7, wherein the axial connection is formed with a curved surface.
9. The electric machine outer rotor of claim 7, wherein the axial connection is formed as a straight face and intersects the first and/or second web portion perpendicularly or obliquely at an obtuse angle.
10. The outer rotor of claim 7, wherein a circumferential width of a radially inner side of the first web portion is the same as a circumferential width of a radially inner side of the second web portion; a circumferential width of a radially outer side of the first web portion is the same as a circumferential width of a radially outer side of the second web portion.
11. The electric external rotor of claim 2, wherein through holes are provided in the annular portion and/or the axial connection portion and/or the first and/or second web portion.
12. The outer rotor of claim 11, wherein the through-holes extend from a position of the first and/or second web portion proximate the first inner tubular portion in a direction away from the first inner tubular portion to a position of the annular portion proximate the outer tubular portion.
13. A brushless permanent magnet electric machine, comprising:
the outer rotor of the electric machine of any one of claims 1 to 12; and
a stator located radially inward of the rotor and disposed opposite the rotor.
14. An electrical product, characterized in that it comprises a brushless permanent magnet electric machine according to claim 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021180380.9U CN212162960U (en) | 2020-06-23 | 2020-06-23 | Motor outer rotor, brushless permanent magnet motor and electric product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021180380.9U CN212162960U (en) | 2020-06-23 | 2020-06-23 | Motor outer rotor, brushless permanent magnet motor and electric product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212162960U true CN212162960U (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021180380.9U Active CN212162960U (en) | 2020-06-23 | 2020-06-23 | Motor outer rotor, brushless permanent magnet motor and electric product |
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| Country | Link |
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| CN (1) | CN212162960U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021258676A1 (en) * | 2020-06-23 | 2021-12-30 | 尼得科电机（青岛）有限公司 | Motor external rotor, brushless permanent magnet motor, and electrical product |
-
2020
- 2020-06-23 CN CN202021180380.9U patent/CN212162960U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021258676A1 (en) * | 2020-06-23 | 2021-12-30 | 尼得科电机（青岛）有限公司 | Motor external rotor, brushless permanent magnet motor, and electrical product |
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