Rotor and motor

Abstract

The utility model discloses a rotor and a motor, and the rotor comprises a magnet yoke which is arranged along the circumferential direction of the rotor; the permanent magnets are arranged in the circumferential direction of the rotor, and the permanent magnets and the magnet yokes are distributed in the radial direction of the rotor; the end plate is arranged on one side of the rotor along the axial direction and is separated from the permanent magnet and the magnet yoke; the injection molding part connects the permanent magnet, the magnet yoke and the end plate into a whole through injection molding, and the end plate is provided with an exposed area exposed out of the injection molding part in the axial direction. According to the rotor provided by the utility model, the end plates are arranged, the end plates, the permanent magnets and the magnet yokes are subjected to integral injection molding by using the injection molding pieces to form the rotor, and the end plates are separated from the permanent magnets, so that the overall structural strength of the rotor is increased, the size and form and position precision of the molded rotor is higher, the flux leakage amount of the rotor is reduced, and the electromagnetic conversion efficiency of a motor is improved; and the performance of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the field of electrical equipment, in particular to a rotor and a motor. Background Art

[0002] Plastic-encapsulated motors have good market prospects due to their beautiful appearance and compact size. Plastic-encapsulated motors are usually manufactured by plastic molding. When the rotor is integrally injection molded, a large amount of plastic is used, resulting in a low structural strength of the rotor. In related technologies, the motor has a large amount of magnetic leakage, which makes the electromagnetic conversion efficiency of the motor low, resulting in poor motor performance. Utility Model Content

[0003] The utility model provides a rotor, which can increase the structural strength.

[0004] The utility model also provides a motor with the rotor.

[0005] According to the first aspect of the utility model, the rotor includes: a yoke, which is arranged along the circumferential direction of the rotor; a permanent magnet, which is arranged along the circumferential direction of the rotor and distributed along the radial direction of the rotor with the yoke; an end plate, which is arranged on one side of the rotor in the axial direction and is spaced apart from the permanent magnet and the yoke; an injection molded part, which connects the permanent magnet, the yoke and the end plate into one body through injection molding, and the end plate has an exposed area exposed outside the injection molded part in the axial direction.

[0006] According to the rotor of the utility model, an end plate is provided, and the end plate, permanent magnet and yoke are integrally injection-molded to form the rotor, and the end plate is spaced apart from the permanent magnet, so that the overall structural strength of the rotor is increased, and the size and shape and position accuracy of the rotor after molding are high, while the magnetic leakage of the rotor is reduced, the electromagnetic conversion efficiency of the motor is improved, and the motor performance is improved.

[0007] In addition, the motor system according to the utility model may also have the following additional technical features:

[0008] In some embodiments, the end plate has a first side surface facing away from the inner space of the permanent magnet and a second side surface facing the inner space of the permanent magnet, and at least one of the first side surface and the second side surface is provided with the exposed area.

[0009] In some embodiments, the end plate is provided with a first positioning hole passing through the end plate along the axial direction, wherein the injection molded part covers a side of the first positioning hole facing away from the inner space of the permanent magnet; and / or the injection molded part exposes a side of the first positioning hole facing the inner space of the permanent magnet.

[0010] In some embodiments, in the projection of the normal plane of the rotor axis, the end plate is provided with at least two exposed areas, and the first positioning hole is provided between adjacent exposed areas.

[0011] In some embodiments, the end plate is provided with reinforcing ribs, and the reinforcing ribs are exposed outside the injection molded part along the axial direction.

[0012] In some embodiments, the end plate includes a main plate portion, the main plate portion is arranged substantially perpendicular to the axis of the rotor, and a portion of the main plate portion protrudes in a direction away from the inner space of the permanent magnet to form the reinforcing rib.

[0013] In some embodiments, the exposed area is configured as a sector whose width gradually increases in the direction away from the rotor axis; or, the exposed area is configured as a rectangle whose width remains unchanged in the direction away from the rotor axis; or, the exposed area is configured as a sector whose width gradually decreases in the direction away from the rotor axis.

[0014] In some embodiments, a ratio D1 / D2 of a dimension D1 of the exposed area along the radial direction of the rotor to a dimension D2 of an outer diameter of the rotor satisfies: 0.3≤D1 / D2≤0.7.

[0015] In some embodiments, the end plate has one or at least two exposed areas distributed along the circumference of the rotor; and / or, in the projection of the normal plane of the rotor axis, the ratio of the area of ​​the end plate exposed outside the injection molded part to the rotor area is greater than or equal to 20% and less than or equal to 80%.

[0016] In some embodiments, in a projection plane perpendicular to the axial direction of the rotor, at least a partial projection of the permanent magnet does not overlap with a projection of the yoke and a projection of the end plate.

[0017] In some embodiments, the minimum distance between the end plate and the permanent magnet in the axial direction of the rotor is greater than 0.2 mm.

[0018] In some embodiments, in a projection plane perpendicular to the axial direction of the rotor, the outer contour of the projection of the end plate is circular, and the diameter D1 of the end plate, the outer diameter D2 of the permanent magnet and the outer diameter D3 of the yoke satisfy: D1<D2<D3.

[0019] In some embodiments, the end plate includes: a main plate portion and a flange, the main plate portion is a flat plate perpendicular to the axis of the rotor, and the flange is connected to the periphery of the main plate portion and extends toward the permanent magnet.

[0020] In some embodiments, a positioning portion is formed on the end plate, and the positioning portion is used to position the end plate during injection molding of the rotor.

[0021] The motor according to the second aspect of the utility model comprises the rotor according to the above-mentioned right.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of a rotor according to an embodiment of the utility model.

[0024] Figure 2 It is a cross-sectional view of a rotor according to an embodiment of the utility model.

[0025] Figure 3 yes Figure 1 Schematic diagram of the permanent magnets and end plates shown in .

[0026] Figure 4 yes Figure 2 Schematic diagram of another angle of the permanent magnet and end plate shown in FIG.

[0027] Figure 5 Schematic diagram of a rotor according to an embodiment of the utility model.

[0028] Figure 6 It is a schematic diagram of an end plate of a rotor according to an embodiment of the utility model.

[0029] Figure 7 It is a schematic diagram of an end plate of a rotor according to an embodiment of the utility model.

[0030] Figure 8 It is a schematic diagram of an end plate of a rotor according to an embodiment of the utility model.

[0031] Figure numerals: rotor 10, permanent magnet 11, yoke 12, end plate 13, exposed area 1301, main board part 131, flange 132, injection molded part 14, rotating shaft 15, notch groove 101, first positioning hole 102, combining hole 103, reinforcing rib 104, second positioning hole 105, third positioning hole 106. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] Reference below Figure 1-Figure 8 A rotor 10 according to an embodiment of the first aspect of the present invention is described.

[0034] like Figures 1 to 8 According to the first embodiment of the utility model, the rotor 10 comprises: a permanent magnet 11, a yoke 12, an end plate 13 and an injection molded part 14. The end plate 13 is arranged on one side of the permanent magnet 11 in the axial direction of the rotor 10, and the end plate 13 is spaced apart from the permanent magnet 11 and the yoke 12; the injection molded part 14 connects the permanent magnet 11, the yoke 12 and the end plate 13 into one body through injection molding.

[0035] For example Figures 1 to 3 The permanent magnet 11 is arranged along the circumference of the rotor 10, and the permanent magnet 11 may include one or at least two arranged along the circumference of the rotor 10; the yoke 12 may be arranged along the circumference of the rotor 10, and the yoke 12 extends along the axial direction of the rotor 10. The yoke 12 may be arranged to be distributed radially with the permanent magnet 11 along the rotor 10, for example, the yoke 12 is arranged radially outside the permanent magnet 11; optionally, the permanent magnet 11 may be an annular integrated structure, and the permanent magnet 11 may also include a plurality of permanent magnets 11, and the plurality of permanent magnets 11 are arranged at intervals around the central axis of the rotor 10. In addition, the rotor 10 may further include a rotating shaft 15, and the rotating shaft 15 may be arranged to be connected to the injection molded part 14.

[0036] In this embodiment, a separate end plate 13 is provided, and then the end plate 13 is injection molded with a plurality of permanent magnets 11 and a yoke 12 to form an integrated rotor 10 structure, so that the overall structural strength of the rotor 10 is enhanced. At the same time, the volume of the injection molded part 14 in the rotor 10 is reduced, which can reduce the impact of the shrinkage and deformation of the injection molded part 14 on the size and shape accuracy of the rotor 10 after the rotor 10 is injection molded and cooled. Preferably, the material of the end plate 13 can be selected from metal materials for processing and manufacturing, which can greatly improve the overall structural strength of the rotor 10 and enable the rotor 10 to maintain a stable and good operating state during long-term use. The structural setting in which the permanent magnet 11 is spaced apart from the end plate 13 reduces the leakage magnetic flux of the permanent magnet 11, thereby improving the electromagnetic conversion efficiency of the motor and increasing the motor performance. It should be noted that the magnetic leakage of the permanent magnet 11 refers to the magnitude of the magnetic field energy leaked out of the magnetic field of the permanent magnet 11 along a specific magnetic circuit. The leaked magnetic field energy will not participate in the electromagnetic conversion of the motor, thereby reducing the electromagnetic conversion efficiency of the motor. Therefore, the method of spacing the permanent magnet 11 and the end plate 13 can make the magnetic field of the permanent magnet 11 not easy to leak out along the end plate 13, thereby reducing the magnetic leakage of the permanent magnet 11 in the rotor 10 and improving the motor performance.

[0037] According to the rotor 10 of this embodiment, an end plate 13 is provided, and the end plate 13, the permanent magnet 11 and the yoke 12 are integrally injection-molded to form the rotor 10 using an injection molding part 14, and the end plate 13 is spaced apart from the permanent magnet 11, so that the overall structural strength of the rotor 10 is increased, and the size and shape and position accuracy of the rotor 10 after molding are high, and at the same time, the magnetic leakage of the rotor 10 is reduced, the electromagnetic conversion efficiency of the motor is improved, and the motor performance is improved.

[0038] In addition, if Figure 5 At least a portion of the end plate 13 is axially exposed outside the injection molded part 14. Optionally, the end plate has an exposed area axially exposed outside the injection molded part. This simplifies the structure of the rotor 10, avoids problems such as poor injection molding caused by excessive thickness of the injection molded part 14, improves the stability of the rotor 10, and reduces the consumables of the rotor 10.

[0039] Combination Figure 1 , Figure 2 as well as Figure 5 In some embodiments, the end plate 13 has a first side surface and a second side surface, the first side surface is away from the inner space of the permanent magnet 11, and the second side surface faces the inner space of the permanent magnet 11. The end plate 13 is provided with at least one exposed area 1301 exposed outside the injection molded part 14. Optionally, the first side surface has at least one exposed area 1301; or, the second side surface has at least one exposed area 1301; or, the first side surface and the second side surface both have at least one exposed area 1301. Thus, the material usage of the injection molded part 14 can be reduced, the consumables of the rotor 10 can be reduced, the cost can be reduced, and the injection molding formation and positioning of the end plate 13 can be observed conveniently, the manufacturing efficiency of the rotor 10 can be improved, and the stability and structural strength of the rotor 10 after manufacturing can be improved, so as to optimize the motor performance.

[0040] Preferably, the utility model is mainly described by taking the example that the first side is provided with at least one exposed area 1301 and the second side is not provided with an exposed area 1301. This arrangement can reduce the amount of material used and facilitate the insulation between the end plate 13 and the stator or other components, further optimizing the performance of the motor. Of course, these are only some implementations of the utility model and are not intended to limit the scope of protection of the utility model.

[0041] like Figure 1 and Figure 2 In some embodiments, the end plate 13 is provided with a first positioning hole 102 that axially penetrates the end plate 13. By providing the first positioning hole 102, the end plate 13 can be positioned by using the first positioning hole 102, so that the end plate 13, the yoke 12 and the permanent magnet 11 are constructed into an integrated structure by injection molding, thereby optimizing the performance of the motor.

[0042] Optionally, the injection molded part 14 covers the side of the first positioning hole 102 away from the inner space of the permanent magnet 11, and covers the side of the first positioning hole 102 facing the inner space of the permanent magnet 11; or, the injection molded part 14 exposes the side of the first positioning hole 102 away from the inner space of the permanent magnet 11, and the injection molded part 14 exposes the side of the first positioning hole 102 facing the inner space of the permanent magnet 11. In addition, it is also provided that the injection molded part 14 covers the side of the first positioning hole 102 away from the inner space of the permanent magnet 11, and the injection molded part 14 exposes the side of the first positioning hole 102 facing the inner space of the permanent magnet 11, so that the first positioning hole 102 can be covered by the injection molded part 14 to maintain the appearance of the rotor 10, and the first positioning hole 102 can be conveniently used to position the rotor 10, thereby improving the molding efficiency of the rotor 10.

[0043] like Figure 4 In some embodiments, in the projection of the normal plane of the axis of the rotor 10, the end plate 13 is provided with at least two exposed areas 1301, and the at least two exposed areas 1301 can be arranged to be distributed along the circumference of the rotor 10, and the first positioning hole 102 is arranged between adjacent exposed areas 1301. The structural strength and stability of the rotor 10 can be improved.

[0044] like Figures 3 to 6 In some embodiments, the end plate 13 is provided with a reinforcing rib 104, and the reinforcing rib 104 is exposed outside the injection molded part 14 along the rotor axial direction. By providing the reinforcing rib 104, the structural strength and stability of the end cover can be improved, thereby improving the structural strength and stability of the rotor 10. Moreover, the reinforcing rib 104 is exposed from the injection molded part 14, which can facilitate the injection molded part 14 to cover the terminal, and avoid the reinforcing rib 104 affecting the injection molding process.

[0045] Optionally, the end plate 13 includes a main plate portion 131, which is substantially perpendicular to the axis of the rotor 10, and a portion of the main plate portion 131 protrudes in a direction away from the inner space of the permanent magnet 11 to form a reinforcing rib 104. This can facilitate the molding of the reinforcing rib 104 and effectively improve the structural strength of the end cover. In addition, the structure of the injection mold can be simplified, and the problem of poor injection molding during the cooling process due to the injection molded part 14 being too thick can be avoided, and the problem of stress concentration can be avoided or reduced, thereby improving the performance and stability of the rotor 10.

[0046] like Figure 5 and Figure 6 In some embodiments, the exposed area 1301 is configured to be fan-shaped with a width gradually increasing in a direction away from the axis of the rotor 10. By providing the fan-shaped exposed area 1301, the performance and structural strength of the injection molded part 14 can be optimized, so that the end plate 13, the permanent magnet 11 and the yoke 12 can be fixed together by the injection molded part 14. In addition, the amount of consumables can be reduced.

[0047] In addition, the exposed area 1301 can also be configured as a rectangle with a constant width in a direction away from the rotor axis, and the corners of the rectangle can be rounded or chamfered. In addition, the exposed area 1301 can also be configured as a sector with a gradually decreasing width in a direction away from the rotor axis.

[0048] In some embodiments, the ratio D1 / D2 of the size D1 of the exposed area along the radial direction of the rotor to the size D2 of the outer diameter of the rotor satisfies: 0.3≤D1 / D2≤0.7. For example, the ratio D1 / D2 can be set to 0.3, 0.4, 0.55, 0.6, 0.65 or 0.7, etc., which can improve the structural strength and stability of the rotor and enable the rotor to have better heat dissipation performance.

[0049] Optionally, the end plate has one or at least two exposed areas distributed along the circumference of the rotor.

[0050] Optionally, in the projection of the normal plane of the axis of the rotor 10, the ratio of the area of ​​the end plate 13 exposed outside the injection molded part 14 to the area of ​​the rotor 10 is greater than or equal to 20% and less than or equal to 80%. For example, the ratio can be set to 20%, 23%, 35%, 45%, 51%, 65%, 75% or 80%, etc., which can reduce the amount of consumables and optimize the performance of the motor while ensuring the structural strength of the rotor 10.

[0051] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, in the projection plane perpendicular to the axial direction of the rotor 10, at least part of the projection of the permanent magnet 11 may not overlap with the projection of the yoke 12 and the projection of the end plate 13. That is to say, in the axial direction of the rotor 10, after the permanent magnet 11 and the end plate 13 are arranged, part of the permanent magnet 11 leaks out of the end plate 13. In this way, when the injection molded part 14 integrally molds the end plate 13, the permanent magnet 11 and the yoke 12, when the permanent magnet 11 is positioned in the axial direction of the rotor 10, the part of the permanent magnet 11 leaking out of the end plate 13 will not be blocked by the end plate 13, and the worker can easily use the fixing tool to position and fix the permanent magnet 11, thereby facilitating the processing and manufacturing of the rotor 10. For example, project the structure of the rotor 10 onto any same plane in the axial direction, let the projection surface of the permanent magnet 11 be set A, the projection surface of the yoke 12 be set B, and the projection surface of the end plate 13 be set C, then

[0052] In some embodiments of the present invention, reference Figure 1 and Figure 2As shown, the minimum distance between the end plate 13 and the permanent magnet 11 in the axial direction of the rotor 10 can be greater than 0.2 mm. Therefore, by limiting the minimum distance of the axial spacing between the end plate 13 and the permanent magnet 11, the magnetic leakage of the permanent magnet 11 is kept at a low level, thereby keeping the electromagnetic conversion efficiency of the motor at a high state, and keeping the motor at a good performance. For example, the minimum distance between the end plate 13 and the permanent magnet 11 in the axial direction of the rotor 10 can be 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, etc. The determination of the minimum distance can select the most suitable value based on the test results. Preferably, the minimum distance between the end plate 13 and the permanent magnet 11 in the axial direction of the rotor 10 can be set to about 1 mm.

[0053] In some embodiments of the present invention, Figure 3 As shown, in the projection plane perpendicular to the axial direction of the rotor 10, the outer contour of the projection of the end plate 13 can be circular, and the diameter D1 of the end plate 13, the outer diameter D2 of the plurality of permanent magnets 11, and the outer diameter D3 of the yoke 12 satisfy: D1<D2<D3. In this way, after the rotor 10 is integrally formed using the injection molding part 14, the end surface area of ​​the rotor 10 in the axial direction is smaller, making the overall structure of the rotor 10 more compact, reducing the material consumption of the rotor 10 to a certain extent, and reducing the manufacturing cost of the rotor 10.

[0054] In some embodiments of the present invention, Figure 7 As shown, the end plate 13 may include: a main plate portion 131 and a flange 132, the main plate portion 131 is a flat plate perpendicular to the axis of the rotor 10, and the flange 132 is connected to the periphery of the main plate portion 131 and extends toward the permanent magnet 11. Thus, the flange 132 can strengthen the bonding force between the end plate 13 and the injection molded part 14. At the same time, since the flange 132 is connected to the periphery of the main plate portion 131 and extends toward the permanent magnet 11, the movement of the end plate 13 in the radial direction of the rotor 10 can be limited, so that the structural stability of the rotor 10 after injection molding is better and the structural strength of the rotor 10 is greater. Preferably, the distance between the end of the flange 132 facing the permanent magnet 11 and the permanent magnet 11 can be set to be about 1 mm.

[0055] In one embodiment of the present invention, reference Figure 1 As shown, the height of the end plate 13 in the axial direction of the rotor 10 can be 2%-20% of the total axial height of the rotor 10. Therefore, the proportion of the end plate 13 in the rotor 10 is limited to a more reasonable range by limiting the height, so that the overall structure of the rotor 10 after forming is more symmetrical and the weight of the rotor 10 remains lighter. For example, the height of the end plate 13 in the axial direction of the rotor 10 can be 2%, 3%, 4%, etc. of the total axial height of the rotor 10. The specific height ratio can be reasonably set according to the production needs and actual operation needs of the rotor 10.

[0056] In one embodiment of the present invention, Figure 7 As shown, the end edge of the flange 132 facing the permanent magnet 11 may be provided with a notch groove 101, and the notch groove 101 is one, or the notch groove 101 includes multiple notch grooves, and the multiple notch grooves 101 are arranged at intervals along the circumference of the end plate 13. Therefore, by providing the notch groove 101 at the end edge of the flange 132 facing the permanent magnet 11, the bonding force between the end plate 13 and the injection molded part 14 can be further strengthened, and the rotation of the end plate 13 around the axial direction of the rotor 10 can be limited, so that the structural stability of the rotor 10 after injection molding is better. For example, the notch groove 101 can be provided with one, two, three, etc., and the specific number of the notch grooves 101 can be reasonably set according to actual needs.

[0057] In some examples of the present invention, reference Figure 7 As shown, in the axial direction of the rotor 10, the depth of the notch groove 101 can be greater than one-fifth of the height of the flange 132. This can ensure that the depth of the combination of the injection molded part 14 and the end plate 13 in the notch groove 101 is large enough when the rotor 10 is integrally injection molded, so that the tightness of the combination of the end plate 13 and the injection molded part 14 is maintained in a good state. For example, the depth of the notch groove 101 can be set to one-quarter, one-third, etc. of the height of the flange 132, and the specific ratio can be reasonably selected according to actual needs.

[0058] In one embodiment of the present invention, Figure 6 As shown, the main board portion 131 may be formed with a second positioning hole 105 that passes through the main board portion 131 along the axial direction of the rotor 10, and the injection molded part 14 is filled in the second positioning hole 105. In this way, when the rotor 10 is injected, the injection molded part 14 can conveniently wrap and fix the end plate 13 completely, and at the same time, a penetration space is reserved for the shaft of the rotor 10, which is convenient for the subsequent assembly of the motor.

[0059] In addition, the end plate 13 may further include a third positioning hole 106 , the injection molded part 14 covers the side of the third positioning hole 106 facing away from the inner space of the permanent magnet 11 , and covers the side of the third positioning hole 106 facing the inner space of the permanent magnet 11 , and the injection molded part 14 penetrates the third positioning hole 106 .

[0060] In some embodiments of the present invention, Figure 6 As shown, the end plate 13 may be provided with a reinforcing rib 104. Thus, the provision of the reinforcing rib 104 can improve the structural strength of the end plate 13, thereby further improving the overall structural strength of the rotor 10. Preferably, a plurality of reinforcing ribs 104 may be provided, and the plurality of reinforcing ribs 104 are arranged at intervals along the circumference of the main plate portion 131. Further, five reinforcing ribs 104 may be provided, and the five reinforcing ribs 104 are evenly spaced along the circumference of the main plate portion 131.

[0061] In some embodiments of the present invention, reference Figure 6 As shown, a positioning portion may be formed on the end plate 13, and the positioning portion is used to position the end plate 13 when the rotor 10 is injection molded. Therefore, by providing the positioning portion, it is convenient to position the end plate 13 when the rotor 10 is integrally injection molded, making the processing and manufacturing of the rotor 10 more convenient. Preferably, the positioning portion may be provided with a plurality of first positioning holes 102 arranged at intervals along the circumferential direction of the main plate portion 131.

[0062] In some embodiments of the present invention, Figure 6 As shown, a coupling portion may be provided on the end plate 13. Thus, the coupling portion may improve the coupling force between the end plate 13 and the injection molded part 14, thereby further improving the structural stability of the rotor 10. Preferably, a plurality of coupling portions may be provided, and the plurality of coupling portions are arranged at intervals along the circumference of the main plate portion 131 and are arranged alternately with the reinforcing ribs 104. Further, a plurality of coupling holes 103 may be provided on the coupling portion, and the plurality of coupling holes 103 are arranged at intervals along the radial direction of the main plate portion 131. Further, the coupling hole 103 may be a round hole or a waist-shaped hole.

[0063] Reference below Figure 1-Figure 8 A motor according to an embodiment of the second aspect of the utility model is described.

[0064] Other structures and operations of the motor according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0065] like Figure 1-Figure 8 As shown, according to the motor of the embodiment of the utility model, by setting the rotor 10 according to the embodiment of the first aspect of the utility model, by setting the end plate 13, using the injection molding part 14 to integrally inject the end plate 13, the permanent magnet 11 and the yoke 12 to form the rotor 10, and the end plate 13 is spaced apart from the permanent magnet 11, so that the overall structural strength of the rotor 10 is increased, the size and shape and position accuracy of the rotor 10 after molding are high, and at the same time the leakage magnetic amount of the rotor 10 is reduced, the electromagnetic conversion efficiency of the motor is improved, and the motor performance is improved.

[0066] The following will refer to Figure 1-Figure 8 A motor according to a specific embodiment of the utility model is described.

[0067] like Figure 1-Figure 8As shown, the motor includes a rotor 10, which is arranged in the motor. The rotor 10 includes a permanent magnet 11, a yoke 12, an end plate 13 and an injection molded part 14. The injection molded part 14 connects the permanent magnet 11, the yoke 12 and the end plate 13 as a whole. The rotor 10 is formed by injection molding the permanent magnet 11, the yoke 12 and the end plate 13 as a whole by the injection molded part 14. There are fifteen permanent magnets 11, and the plurality of permanent magnets 11 are arranged in a ring shape around the axial direction of the rotor 10. The yoke 12 is annular and sleeved on the radial outer side of the plurality of permanent magnets 11. The end plate 13 is arranged on one side of the plurality of permanent magnets 11 in the axial direction and is spaced apart from the permanent magnets 11. In the axial direction of the rotor 10, after the permanent magnets 11 and the end plate 13 are arranged, a part of the permanent magnet 11 leaks out of the end plate 13, so that when the rotor 10 is injection molded, the worker can easily position and fix the permanent magnet 11.

[0068] According to the rotor 10 of this embodiment, an end plate 13 is provided, and the end plate 13, the permanent magnet 11 and the yoke 12 are integrally injection-molded to form the rotor 10 using an injection molding part 14, and the end plate 13 is spaced apart from the permanent magnet 11, so that the overall structural strength of the rotor 10 is increased, and the size and shape and position accuracy of the rotor 10 after molding are high, and at the same time, the magnetic leakage of the rotor 10 is reduced, the electromagnetic conversion efficiency of the motor is improved, and the motor performance is improved.

[0069] The end plate 13 includes a main plate portion 131 and a flange 132. The flange 132 extends along the circumference of the end plate 13 toward the permanent magnet 11. One end of the flange 132 close to the permanent magnet 11 is provided with five notches 101. The notches 101 are arranged at intervals along the circumference of the end plate 13. The main plate portion 131 is provided with a positioning portion, a reinforcing rib 104 and a connecting portion. The main plate portion 131 is formed with a second positioning hole 105 that penetrates the rotor 10 axially. The positioning portion is provided with five first positioning holes 102, and the first positioning holes 102 are arranged at intervals along the circumference of the main board. Five reinforcing ribs 104 are provided, and the reinforcing ribs 104 are arranged at intervals along the circumference of the main board. Five connecting portions are provided, and the connecting portions are arranged at intervals along the circumference of the main board and staggered with the reinforcing ribs 104. Three connecting holes 103 are provided on each connecting portion, and the connecting holes 103 on the connecting portion are arranged at intervals along the radial direction of the main board portion 131, and one of the connecting holes 103 close to the axis of the main board portion 131 is a waist-shaped hole, and the rest are round holes.

[0070] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0072] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0074] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotor, characterized in that: include: A yoke, wherein the yoke is arranged along the circumference of the rotor; A permanent magnet, wherein the permanent magnet is arranged along the circumferential direction of the rotor and is distributed along the radial direction of the rotor together with the magnetic yoke; an end plate, the end plate being arranged on one side of the rotor in the axial direction and being spaced apart from the permanent magnet and the yoke; The injection molded part connects the permanent magnet, the yoke and the end plate into one body through injection molding, and the end plate has an exposed area exposed outside the injection molded part along the axial direction.

2. The rotor according to claim 1, characterized in that The end plate has a first side surface facing away from the inner space of the permanent magnet and a second side surface facing the inner space of the permanent magnet, and at least one of the first side surface and the second side surface is provided with the exposed area.

3. The rotor according to claim 2, characterized in that The end plate is provided with a first positioning hole penetrating the end plate along the axial direction, The injection molded part covers a side of the first positioning hole that is away from the inner space of the permanent magnet; and / or the injection molded part exposes a side of the first positioning hole that is toward the inner space of the permanent magnet.

4. The rotor according to claim 3, characterized in that In the projection of the normal plane of the rotor axis, the end plate is provided with at least two exposed areas distributed along the circumference of the rotor, and the first positioning hole is provided between adjacent exposed areas.

5. The rotor according to any one of claims 1 to 4, characterized in that: The end plate is provided with reinforcing ribs, and the reinforcing ribs are exposed outside the injection molded part along the axial direction.

6. The rotor according to claim 5, characterized in that The end plate includes a main plate portion, the main plate portion is arranged substantially perpendicular to the axis of the rotor, and a portion of the main plate portion protrudes in a direction away from the inner space of the permanent magnet to form the reinforcing rib.

7. The rotor according to any one of claims 1 to 4, characterized in that: The exposed area is configured as a sector whose width gradually increases in the direction away from the rotor axis; or, the exposed area is configured as a rectangle whose width remains constant in the direction away from the rotor axis; or, the exposed area is configured as a sector whose width gradually decreases in the direction away from the rotor axis.

8. The rotor according to any one of claims 1 to 4, characterized in that: A ratio D1 / D2 of a dimension D1 of the exposed area along the radial direction of the rotor to a dimension D2 of an outer diameter of the rotor satisfies: 0.3≤D1 / D2≤0.

7.

9. The rotor according to any one of claims 1 to 4, characterized in that: The end plate has one or at least two exposed areas distributed along the circumference of the rotor; and / or, in the projection of the normal plane of the rotor axis, the ratio of the area of ​​the end plate exposed outside the injection molded part to the rotor area is greater than or equal to 20% and less than or equal to 80%.

10. The rotor according to any one of claims 1 to 4, characterized in that: In a projection plane perpendicular to the axial direction of the rotor, at least a partial projection of the permanent magnet does not overlap with a projection of the yoke and a projection of the end plate; and / or, the minimum distance between the end plate and the permanent magnet in the axial direction of the rotor is greater than 0.2 mm; And / or, in a projection plane perpendicular to the axial direction of the rotor, the outer contour of the projection of the end plate is circular, and the diameter D1 of the end plate, the outer diameter D2 of the permanent magnet and the outer diameter D3 of the yoke satisfy: D1<D2<D3.

11. The rotor according to any one of claims 1 to 4, characterized in that: The end plate includes: a main plate portion and a flange, wherein the main plate portion is a flat plate perpendicular to the axis of the rotor, and the flange is connected to the periphery of the main plate portion and extends toward the permanent magnet; And / or, the end plate is formed with a positioning portion, and the positioning portion is used to position the end plate during injection molding of the rotor.

12. A motor, characterized in that: Comprising a rotor according to any one of claims 1-11.

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