CN220325358U - Plastic covered assembly, motor and vehicle - Google Patents

Abstract

The utility model relates to a plastic-coated component, a motor and a vehicle. The plastic-coated component comprises: a body for encasing at least part of the rotor core and/or encasing at least part of the permanent magnets; the fan blade piece is arranged on at least one end face of the body, the end face is provided with an inner edge and an outer edge, and the fan blade piece extends from the inner edge to the outer edge. The plastic-coated component provided by the utility model has a better heat dissipation effect, and can prolong the service life and improve the reliability of the motor.

Description

Plastic covered assembly, motor and vehicle

Technical Field

The utility model relates to the technical field of power devices, in particular to a plastic-coated component, a motor and a vehicle.

Background

With the rapid development of permanent magnet motor technology, the energy efficiency of the motor is continuously upgraded, the motor is increasingly upgraded in the miniaturization and high-efficiency directions, and the requirements on cost and performance are continuously improved.

In the prior art, a permanent magnet motor generally adopts an injection molding rotor to improve the power output performance of the motor, but the injection molding rotor has poor heat dissipation, so that the temperature of the motor is increased during operation, and the service life of the motor is shortened due to long-term operation; meanwhile, under the conditions of high-temperature working environment or high-power operation, the motor can be stopped or damaged due to the fact that the temperature rises too high, and the reliability of the motor is reduced.

Disclosure of Invention

An object of the utility model is to provide a new technical solution for plastic-coated components and motors.

According to a first aspect of the present utility model there is provided an overmolded assembly comprising:

a body for encasing at least part of the rotor core and/or encasing at least part of the permanent magnets;

the fan blade piece is arranged on at least one end face of the body, the end face is provided with an inner edge and an outer edge, and the fan blade piece extends from the inner edge to the outer edge.

Optionally, the body includes at least two separation structures, and adjacent separation structures interconnect, each separation structure is last to be provided with at least one fan blade piece.

Optionally, all the fan blade pieces are disposed on the same side of the partition structure.

Optionally, the partition structure has a heat dissipation hole on the other side opposite to the fan blade, and the heat dissipation hole is opposite to the permanent magnet.

Optionally, the body is provided with a through hole, the through hole is used for accommodating the inner ring of the rotor core, the number of the fan blade pieces is at least two, and at least two fan blade pieces are radially distributed outwards along the through hole.

Optionally, the fan blade piece is provided with a chamfer at one end close to the through hole and one end far away from the through hole.

Optionally, the body is used to encase all of the permanent magnets and a portion of the rotor core.

Optionally, the fan blade piece is provided with a reinforcing rib, and the reinforcing rib is located at the middle position of the fan blade piece.

Optionally, the fan blade piece is in a sheet shape and is perpendicular to the end face of the body.

Optionally, the body is injection molded on the rotor core and/or the permanent magnet, and an outer edge of the body is provided with a bevel, and the bevel is adjacent to the rotor core and/or the permanent magnet.

Optionally, the rotor core is radially provided with mounting grooves matched with the permanent magnets in number along the radial direction, and the permanent magnets are assembled in the mounting grooves in a one-to-one correspondence.

According to a second aspect of the present utility model there is provided an electrical machine comprising a stator assembly and a plastics-over-package assembly as claimed in any preceding claim, the plastics-over-package assembly being rotatably mounted within the stator assembly.

According to a third aspect of the present utility model there is provided a vehicle employing a plastics-coated component as claimed in any preceding claim, or fitted with an electric motor as hereinbefore described.

The utility model has the technical effects that:

the rotor core or the permanent magnet can be wrapped by the body of the plastic-coated component, and the fan blade piece is arranged on one end face of the body component, so that in actual use, when the rotor core rotates, the fan blade piece rotates along with the rotor core to play a role in heat dissipation of the whole plastic-coated component. In addition, the end face of the body is provided with the inner edge and the outer edge, and the fan blade piece extends from the inner edge to the outer edge, so that the size of the fan blade piece is large, and the heat dissipation effect of the plastic-coated component is obviously improved.

Other features of the present utility model and its advantages will become apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

Fig. 1 is a schematic structural diagram of a plastic-coated component provided by the utility model.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is a top view of fig. 1.

Fig. 4 is an exploded view of fig. 1.

Fig. 5 is an assembly schematic diagram of a rotor core and a body provided by the present utility model.

Fig. 6 is a schematic diagram of the structure of another view of fig. 5.

Fig. 7 is a schematic structural view of a rotor core according to the present utility model.

Fig. 8 is a schematic structural diagram of a body according to the present utility model.

Fig. 9 is a cross-sectional view taken along A-A of fig. 8.

Fig. 10 is a B-B cross-sectional view of fig. 8.

Reference numerals illustrate:

10. a rotating shaft; 20. a body; 21. a fan blade member; 22. reinforcing ribs; 23. chamfering; 24. bevel angle; 25. a heat radiation hole; 26. a protruding portion; 27. injection molding the top wall; 28. a partition structure; 29. a receiving frame; 210. an end face; 211. an inner edge; 212. an outer edge; 213. a through hole; 30. a rotor core; 31. a mounting groove; 32. an inner bridge; 33. an outer bridge; 34. a sector; 341. arc; 35. a support bridge; 36. a shaft hole; 37. an inner ring; 40. permanent magnets.

Detailed Description

Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses.

Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

As shown in fig. 1 to 10, according to a first aspect of the present utility model, there is provided an overmold assembly comprising: a body 20, the body 20 being for wrapping at least part of the rotor core 30 and/or wrapping at least part of the permanent magnets 40; the fan blade 21 is disposed on at least one end surface 210 of the body 20, the end surface 210 is provided with an inner edge 211 and an outer edge 212, and the fan blade 21 extends from the inner edge 211 to the outer edge 212. Thus, when the rotor core 30 rotates, the fan blade member 21 rotates accordingly to exert a heat radiation effect on the entire plastic-coated component. In addition, since the fan blade member 21 extends from the inner edge 211 to the outer edge 212, the size of the fan blade member is larger, and the heat dissipation effect of the plastic coated component is obviously improved.

Specifically, in the present embodiment, the plastic-coated component is generally assembled with the rotating shaft 10 to form a rotor assembly, and is applied to an electric machine. The body 20 of the overmolded assembly is capable of encapsulating at least a portion of the rotor core 30 and/or at least a portion of the permanent magnets 40. Alternatively, as can be seen in more detail from fig. 1 to 3, in the embodiment of the present application, the body 20 wraps all the permanent magnets 40 and part of the rotor core 30, which makes the permanent magnets 40 more reliable when connected with the rotor core 30, and can avoid the permanent magnets 40 and the rotor core 30 from moving axially, resulting in friction and collision interference between the permanent magnets 40 and other parts inside the motor, thereby increasing the reliability of the motor. Wherein the rotary shaft 10 may be fixed by being assembled with the shaft hole 36 at the center of the rotor core 30.

Further, the fan blade member 21 is disposed on the main body 20, so that in actual use, when the rotor core 30 rotates, the fan blade member 21 rotates along with it, so that it can generate a rotating air flow inside the motor, and take away the heat generated by the plastic-coated component and the stator in operation, so as to achieve the effect of reducing temperature rise for the whole machine.

In addition, the fan blade 21 is disposed on one end face of the body 20, for example, the fan blade 21 is located directly above the permanent magnet 40, so that on one hand, the size of the fan blade 21 is not limited by the structure of the plastic-coated component, and when the fan blade 21 rotates along with the rotor core 30, the speed of the outer side of the fan blade 21 is high, the wind speed is high, the heat dissipation effect is improved, and on the other hand, the raw material cost of the body 20 can be saved.

In practical applications, the setting position of the fan blade 21 may be designed in a matching manner according to the actual requirement and the process requirement of the motor, for example, the fan blade 21 may be located directly under the permanent magnet 40.

Optionally, referring to fig. 1 to 6 and 8, the body 20 includes at least two separating structures 28, where adjacent separating structures 28 are connected to each other, and at least one fan blade 21 is disposed on each separating structure 28.

Specifically, in this embodiment, the fan blade member 21 is disposed on the separation structure 28 of the body 20, so that the size of the fan blade member 21 can be designed to be larger, so that a large-area heat dissipation effect can be achieved on the whole plastic-coated component, and the heat dissipation efficiency is improved.

Alternatively, referring to fig. 1 to 5, all the fan blades 21 are disposed on the same side of the partition structure 28.

Specifically, in this embodiment, since the speed of the outer side of the fan blade member 21 is faster and the wind speed is higher when the fan blade member 21 rotates with the rotor core 30, all the fan blade members 21 can radiate heat for the place with the largest heat productivity of the whole plastic-coated component, thereby improving the heat radiation effect and heat radiation efficiency of the plastic-coated component and saving the raw material cost of the fan blade member 21.

Alternatively, referring to fig. 6 and 10, the partition structure 28 has a heat dissipation hole 25 at the other side opposite to the fan blade member 21, the heat dissipation hole 25 being disposed opposite to the permanent magnet 40.

Specifically, in the present embodiment, a plurality of heat dissipation holes 25 are provided on the other side of the partition structure 28 opposite to the fan blade member 21, and on the one hand, the presence of the heat dissipation holes 25 increases the heat dissipation area for the rotor core 30 and the permanent magnet 40, and on the other hand, the permanent magnet 40 can be fixed well during the injection molding process of the body 20 by using the heat dissipation holes 25. The separation structure 28 and the fan blade member 21 may be integrally formed by injection molding, so as to improve the connection reliability of the fan blade member 21 and the separation structure 28.

Optionally, referring to fig. 1 to 5, the body 20 is provided with a through hole 213, the through hole 213 is configured to accommodate the inner ring 37 of the rotor core 30, the number of the fan blades 21 is at least two, and at least two fan blades 21 are radially arranged outwards along the through hole 213.

Specifically, since the rotor core 30 is generally circular in cross section, in the present embodiment, a through hole 213 is provided in the body 20, that is, the inner ring 37 of the rotor core 30 is received through the through hole 213, thereby improving the reliability of the connection of the over-molded components. Wherein, the fan blades 21 may be disposed in two, and the two fan blades 21 are radially arranged outwards along the through hole 213, so that the fan blades 21 can be uniformly arranged at one end of the permanent magnet 40, and the temperature of the rotor core 30 and the permanent magnet 40 is reduced more uniformly. Of course, three, four, five or more fan blades 21 may be provided, and these fan blades 21 may be arranged in the foregoing manner, so as to further improve the cooling uniformity of the rotor core 30 and the permanent magnets 40.

Alternatively, referring to fig. 1 to 5, the blade member 21 is provided with a chamfer 23 at both an end close to the through hole 213 and an end far from the through hole 213.

Specifically, in this embodiment, the chamfer 23 is disposed at the end of the fan blade 21 close to the through hole 213 and the end of the fan blade away from the through hole 213, which is beneficial to the manufacturing and processing of the fan blade 21, i.e. the demolding of the fan blade 21 in the injection molding process is facilitated, and the processing efficiency of the plastic-coated component and the processing quality of the body 20 are improved.

Optionally, referring to fig. 1, 3 and 5, the fan blade 21 is provided with a reinforcing rib 22, and the reinforcing rib 22 is located at a middle position of the fan blade 21.

Specifically, in the present embodiment, the reinforcing ribs 22 are provided on the surface of the fan blade member 21, so that the overall strength of the fan blade member 21 is improved.

Of course, in another embodiment, the reinforcing rib 22 may be disposed at a middle position of the fan blade member 21 in the vertical direction, so as to enhance the overall strength of the fan blade member 21 and also ensure the rotation stability thereof.

In practical applications, the number and the arrangement positions of the reinforcing ribs 22 can also be matched and designed according to the practical requirements and the technological requirements of the motor.

Alternatively, referring to fig. 1, 2 and 5, the blade member 21 is in a sheet shape and is perpendicular to the end surface of the permanent magnet 40.

Specifically, in the present embodiment, the fan blade member 21 is designed to be sheet-shaped and vertically arranged, so that the heat dissipation effect of the fan blade member 21 can be further improved.

Optionally, referring to fig. 5, the body 20 is injection molded on the rotor core 30 and/or the permanent magnets 40, and an outer edge 212 of the body 20 is provided with a bevel 24, and the bevel 24 abuts the rotor core 30 and/or the permanent magnets 40.

Specifically, in this embodiment, the body 20 is directly injection molded on the rotor core 30 through an injection molding process, so that the rotor core 30 is more firmly connected, and stability and reliability of the plastic-coated component are improved.

Of course, the body 20 may also be directly injection molded on the permanent magnet 40 through an injection molding process, so that the permanent magnet 40 is more firmly connected; or the body 20 may be directly injection-molded on the rotor core 30 and the permanent magnet 40 through an injection molding process, so as to improve the connection reliability of the rotor core 30 and the permanent magnet 40, and further improve the stability and reliability of the plastic-coated component.

In addition, in the injection molding process, the straight edges of the parting surfaces of the injection mold are easy to wear, the upper die and the lower die are not completely concentric, so that a flash is easy to generate on the parting surfaces during injection molding, and the bevel angle 24 is arranged at the outer edge of the body 20, so that the flash is not easy to form at the edge position of the body 20 (namely, the boundary area of plastic coating and non-plastic coating), and friction risks are avoided in the operation process of the plastic coating component. The bevel 24 abuts against the rotor core 30 and/or the permanent magnet 40, which further prevents looseness between the rotor core 30 and/or the permanent magnet 40 and the body 20 due to the friction of the burrs, and affects the rotational stability.

Alternatively, referring to fig. 7, the rotor core 30 is radially provided with mounting grooves 31 corresponding to the number of the permanent magnets 40 in a radial direction thereof, and the permanent magnets 40 are fitted in the mounting grooves 31 in a one-to-one correspondence.

Specifically, in this embodiment, in order to further make the assembly of the permanent magnets 40 and the rotor core 30 more reliable, the mounting groove 31 is provided on the rotor core 30, so that each permanent magnet 40 can be fixedly assembled in the mounting groove 31, and the whole plastic-coated component has better integrity by combining the coating of the body 20 to the permanent magnets 40.

Optionally, referring to fig. 9 and 10, the body 20 further has a receiving frame 29 matching the shape and number of the permanent magnets 40, so that the permanent magnets 40 are fixed in the mounting groove 31 by being covered.

Specifically, in a specific process, the permanent magnets 40 are fitted in the respective mounting grooves 31 in a one-to-one correspondence, and in order to avoid collision of edges of the permanent magnets 40, deburring, chamfering, deburring, or the like is generally required, which, however, may result in poor matching of the permanent magnets 40 with the mounting grooves 31.

Therefore, in the present embodiment, the space between the mounting groove 31 and the chamfer of the edge of the permanent magnet 40 is filled to form the accommodating frame 29 during the injection molding process of the body 20, so that the assembly of the permanent magnet 40 and the rotor core 30 is more reliable and firm, the integrity of the plastic-coated component is further improved, and the problem of poor matching degree between the permanent magnet 40 and the mounting groove 31 is avoided. After the injection molding is completed, the receiving frame 29 also becomes part of the partition structure 28.

Alternatively, referring to fig. 7, a shaft hole 36 for assembling a rotating shaft is provided at the center of the rotor core 30, the mounting groove 31 is provided with an inner bridge 32 at a side close to the shaft hole 36, and an outer bridge 33 at a side remote from the shaft hole 36, the inner bridge 32 and the outer bridge 33 being capable of restricting movement of the permanent magnet 40 in the radial direction of the rotor core 30.

Specifically, in the present embodiment, the permanent magnets 40 are assembled in the mounting grooves 31 one by one, and the permanent magnets 40 are more attached to the assembly of the rotor core 30 by the limiting action of the inner retaining bridge 32 and the outer retaining bridge 33, so that the permanent magnets 40 are prevented from moving in the radial direction along the rotor core 30, and the stability of the plastic-coated component is further improved.

Alternatively, referring to fig. 7, a sector 34 is formed between two adjacent mounting slots 31 on the rotor core 30; the sectors 34 are connected to the center of the rotor core 30 by support bridges 35, and the width of the inner ends of the support bridges 35 is greater than the width of the outer ends.

Specifically, in the present embodiment, the center positions of the sectors 34 and the rotor core 30 are connected by the support bridges 35, and the width of the inner ends of the support bridges 35 is larger than that of the outer ends, so that the structural strength of the support bridges 35 can be enhanced, and the magnetic leakage phenomenon can be optimized due to the smaller width of the outer ends.

Alternatively, referring to fig. 7, the inner retaining bridges 32 are symmetrically disposed on two sides of the mounting groove 31, and the inner retaining bridges 32 are in a circular arc shape protruding toward the mounting groove 31, and the width of the outer end of the supporting bridge 35 is smaller than the center distance of the two opposite inner retaining bridges 32.

Specifically, in the present embodiment, the width of the outer end of the supporting bridge 35 is smaller than the center-to-center distance of the two inner retaining bridges 32, so that the width of the outer end of the supporting bridge 35 is smaller, and the inner retaining bridges 32 can realize blocking of the radial movement of the permanent magnets 40, and simultaneously, can optimize the magnetic leakage phenomenon between the permanent magnets 40 and the rotor core 30, and when the magnetic leakage phenomenon is applied to a motor, the safety and reliability of the motor are further improved.

Alternatively, referring to fig. 7, the sector 34 is provided with an arc 341 concaved toward the sector 34 at a position of the outer bridge 33, and a center of the arc 341 is located outside the sector 34.

Specifically, in the present embodiment, the circular arc 341 recessed toward the sector 34 is provided at the position of the outer bridge 33 in the sector 34, so that on the one hand, the processing process of the rotor core 30 can be simplified, and on the other hand, the formation of stress concentration at the outer bridge 33 can be avoided, the structural strength of the outer bridge 33 is improved, and the assembly reliability of the permanent magnet 40 in the mounting groove 31 is further ensured.

Optionally, referring to fig. 8 to 10, the body 20 further has protrusions 26 matched to the number of the permanent magnets 40, and the protrusions 26 are filled between two adjacent support bridges 35.

Specifically, in the above-described structure, the permanent magnet 40 and a part of the rotor core 30 are molded by an injection molding process, so that the formed body 20 can fill the assembly gap between the rotor core 30 and the permanent magnet 40, the reliability of the connection of the rotor core 30 and the permanent magnet 40 is enhanced, the overall rigidity of the molded assembly is improved, and reference is made to the protruding portion 26 in fig. 5 and the injection molded top wall 27 in fig. 6.

In addition, the protruding part 26 and the injection molding top wall 27 enable the inner ring area of the rotor core 30 and the sector area 34 to be connected into a whole, further reduce the width of the supporting bridge 35, reduce magnetic leakage and improve the performance of the motor.

According to a second aspect of the present utility model there is provided an electrical machine comprising a stator assembly and the over-moulding component of the first aspect, the over-moulding component being rotatably mounted on the inside of the stator assembly.

Specifically, in the present embodiment, the motor is assembled by using the plastic covered component and the stator assembly provided in the first aspect of the present utility model, and further, the shaft hole 36 is provided at the center of the rotor core 30 of the plastic covered component, so that the rotating shaft 10 is installed in the plastic covered component to form a rotor assembly. Because the plastic coated component provided by the first aspect of the utility model can perform rotary heat dissipation through the fan blade piece 21 in the rotation process, the temperature rise of the motor in the operation process is obviously reduced, the heat dissipation effect is improved, and the service life and the reliability of the motor are improved.

According to a third aspect of the present utility model there is provided a vehicle employing an overmolded assembly as described in the first aspect or fitted with an electric machine as described in the first aspect. The vehicle can thus obtain good heat radiation performance.

The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.

While certain specific embodiments of the utility model have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims (13)

1. A plastic coated component comprising:

-a body (20), the body (20) being adapted to encase at least part of the rotor core (30) and/or encase at least part of the permanent magnets (40);

the fan blade piece (21), the fan blade piece (21) set up at least in on terminal surface (210) of body (20), terminal surface (210) are equipped with inward flange (211) and outward flange (212), fan blade piece (21) follow inward flange (211) are extended to outward flange (212).

2. The plastic-coated component according to claim 1, wherein the body (20) comprises at least two separating structures (28), adjacent separating structures (28) are connected with each other, and at least one fan blade (21) is arranged on each separating structure (28).

3. The plastic-coated component according to claim 2, wherein all the fan blades (21) are arranged on the same side of the separation structure (28).

4. A plastic-coated component according to claim 3, characterized in that the partition structure (28) has a heat-dissipating hole (25) on the other side opposite to the fan blade member (21), the heat-dissipating hole (25) being disposed opposite to the permanent magnet (40).

5. The plastic-coated component according to claim 1, wherein the body (20) is provided with through holes (213), the through holes (213) are used for accommodating inner rings (37) of the rotor core (30), the number of the fan blade pieces (21) is at least two, and at least two fan blade pieces (21) are radially arranged outwards along the through holes (213).

6. The plastic-coated component according to claim 5, wherein the blade member (21) is provided with a chamfer (23) at both an end closer to the through hole (213) and an end farther from the through hole (213).

7. The plastic-coated component according to claim 1, wherein the body (20) is used for wrapping all the permanent magnets (40) and part of the rotor core (30), and all the fan blade pieces are radially arranged outwards along the through holes.

8. The plastic coated component according to any one of claims 1-7, wherein the fan blade member (21) is provided with a reinforcing rib (22), and the reinforcing rib (22) is located at the middle position of the fan blade member (21).

9. The plastic coated assembly according to any one of claims 1-7, wherein the fan blade member (21) is sheet-shaped and perpendicular to the end face (210) of the body (20).

10. The overmolded assembly according to any of claims 1-7, wherein the body (20) is injection molded onto the rotor core (30) and/or the permanent magnets (40), the outer edge (212) of the body (20) being provided with a bevel angle (24), the bevel angle (24) being contiguous with the rotor core (30) and/or the permanent magnets (40).

11. The plastic-coated component according to any one of claims 1 to 7, wherein the rotor core (30) is radially provided with mounting grooves (31) matching the number of the permanent magnets (40) along the radial direction thereof, and the permanent magnets (40) are fitted in the mounting grooves (31) in one-to-one correspondence.

12. An electric machine comprising a stator assembly and the overmolded assembly of any one of claims 1-11 rotatably mounted within the stator assembly.

13. A vehicle employing a plastic coated component as claimed in any one of claims 1 to 11 or fitted with an electric machine as claimed in claim 12.