Surface-mounted outer rotor permanent magnet synchronous motor and driving motor assembly

Abstract

The embodiment of the utility model discloses a surface-mounted outer rotor permanent magnet synchronous motor and a driving motor assembly, and relates to the technical field of permanent magnet synchronous motors. The motor comprises a rotor core and a permanent magnet. The rotor iron core is provided with permanent magnet grooves. The permanent magnets are arranged in the permanent magnet grooves, and the outlines of the permanent magnets are matched with those of the permanent magnet grooves; wherein the bottom ends of the permanent magnet grooves face the outer edge of the rotor iron core, the opening ends of the permanent magnet grooves face the air gap, the bottom ends are large-diameter ends, the opening ends are small-diameter ends, and the large-diameter end faces of the permanent magnets are close to the bottom ends of the permanent magnet grooves so as to limit the freedom degree of the permanent magnets in the circumferential direction. According to the motor, the permanent magnet grooves with the large-diameter bottom surfaces and the small-diameter openings are arranged, and the included angles of the permanent magnets are limited, so that the permanent magnets can be clamped in the permanent magnet grooves, the effect of limiting the degree of freedom of the permanent magnets in the circumferential direction is achieved, and the influence of circumferential movement of the permanent magnets caused by adhesive aging is reduced.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet synchronous motor technology, and in particular to a surface-mounted external rotor permanent magnet synchronous motor and its drive motor assembly. Background Technology

[0002] Currently, in surface-mounted external rotor permanent magnet synchronous motors, the permanent magnets are mostly fixed to the rotor core using adhesive, such as... Figure 1 As shown. However, for motors mounted in automobiles, the more complex application scenarios and stringent mechanical requirements increase the risk of adhesive aging and permanent magnet detachment. Furthermore, the positioning accuracy of the permanent magnets in permanent magnet synchronous motors with this structure is difficult to guarantee during production.

[0003] Therefore, there is an urgent need for a new surface-mounted external rotor permanent magnet synchronous motor and drive motor assembly. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a surface-mounted external rotor permanent magnet synchronous motor and drive motor assembly. The surface-mounted external rotor permanent magnet synchronous motor sets a permanent magnet slot with a large-diameter bottom surface and a small-diameter opening, and restricts the included angle of the permanent magnet, so that the permanent magnet can be locked in the permanent magnet slot, thereby restricting the circumferential degree of freedom of the permanent magnet and reducing the influence of the aging of the adhesive on the circumferential movement of the permanent magnet in the related technology.

[0005] This utility model discloses a surface-mounted external rotor permanent magnet synchronous motor, comprising:

[0006] The rotor core has permanent magnet slots;

[0007] A permanent magnet is arranged in the permanent magnet slot, and its outline matches the outline of the permanent magnet slot.

[0008] The bottom end of the permanent magnet slot faces the outer edge of the rotor core, the opening end of the permanent magnet slot faces the air gap, the bottom end is the large diameter end, the opening end is the small diameter end, and the large diameter end face of the permanent magnet is close to the bottom end of the permanent magnet slot to restrict the degree of freedom of the permanent magnet in the circumferential direction.

[0009] Furthermore, the cross-section of the permanent magnet groove and the cross-section of the permanent magnet are both fan-shaped.

[0010] Furthermore, the included angle between the large-diameter end face of the permanent magnet and the sidewall is α, where α ≤ 90°.

[0011] Furthermore, the angle formed between the bottom end of the permanent magnet groove and the side wall of the permanent magnet groove is β, where β = α.

[0012] Furthermore, β ≥ 60°.

[0013] Furthermore, the connection between the opening of the permanent magnet groove and the sidewall is rounded.

[0014] Furthermore, there is a first accommodating gap between the permanent magnet and the permanent magnet groove. The first accommodating gap is continuous and is an open cavity structure without a medium, so as to allow the introduction of external cooling medium.

[0015] Furthermore, a second accommodating gap is provided between the permanent magnet and the permanent magnet groove, and the second accommodating gap is filled with adhesive.

[0016] Furthermore, the depth of the permanent magnet groove is d, where d ≥ 0.8 mm.

[0017] This utility model embodiment also discloses a drive motor assembly, including the surface-mounted external rotor permanent magnet synchronous motor as described above.

[0018] The surface-mounted external rotor permanent magnet synchronous motor and drive motor assembly provided by this utility model have the following beneficial effects, including but not limited to:

[0019] 1) This permanent magnet synchronous motor uses a permanent magnet slot with a large-diameter bottom surface and a small-diameter opening, and restricts the included angle of the permanent magnet, so that the permanent magnet can be locked in the permanent magnet slot. This restricts the circumferential degree of freedom of the permanent magnet and reduces the impact of aging of the adhesive on the circumferential movement of the permanent magnet in related technologies. In addition, the stamped permanent magnet slot has a more regular slot shape, which can ensure the fitting accuracy between the permanent magnet and the slot, reduce assembly errors, and improve the overall stability and reliability of the motor.

[0020] 2) The surface-mounted external rotor permanent magnet synchronous motor is designed with a first accommodating gap that is continuously through, making it suitable for oil-cooled motors. This allows the cooling medium (e.g., oil) to flow into the first accommodating gap to directly cool the permanent magnets, reducing the loss of the permanent magnets and thus reducing the cost of the permanent magnets.

[0021] 3) The surface-mounted external rotor permanent magnet synchronous motor can further fix the permanent magnet and improve its stability by setting a second receiving gap filled with adhesive. Attached Figure Description

[0022] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0023] Figure 1 A schematic diagram of a permanent magnet synchronous motor provided for related technologies;

[0024] Figure 2 A schematic diagram of the structure of a surface-mounted external rotor permanent magnet synchronous motor provided in this embodiment of the utility model;

[0025] Figure 3 for Figure 2 Enlarged view of point I in the middle;

[0026] Figure 4 This is an enlarged schematic diagram of the first accommodating gap provided in one embodiment of the present invention;

[0027] Figure 5 An enlarged schematic diagram of the second accommodating gap provided for another embodiment of the present invention.

[0028] Icons: 100 - Surface-mounted external rotor permanent magnet synchronous motor; 10 - Rotor core; 101 - Permanent magnet slot; 11 - Permanent magnet; 12 - Stator core. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] Please refer to Figures 2-3 , Figure 2 A schematic diagram of the structure of the surface-mounted external rotor permanent magnet synchronous motor 100 provided in this embodiment of the utility model; Figure 3 for Figure 2Enlarged schematic diagram at point I. This utility model provides a surface-mounted external rotor permanent magnet synchronous motor 100, including a rotor core 10 and a permanent magnet 11. The rotor core 10 has a permanent magnet slot 101; the permanent magnet 11 is arranged in the permanent magnet slot 101, and its outline matches the outline of the permanent magnet slot 101; wherein, the bottom end of the permanent magnet slot 101 faces the outer edge of the rotor core 10, the opening end of the permanent magnet slot 101 faces the air gap, the bottom end is the large diameter end, the opening end is the small diameter end, and the large diameter end face of the permanent magnet 11 is close to the bottom end of the permanent magnet slot 101 to restrict the circumferential degree of freedom of the permanent magnet 11.

[0032] It is worth noting that this permanent magnet synchronous motor, by setting a permanent magnet slot 101 with a large-diameter bottom surface and a small-diameter opening, and restricting the included angle of the permanent magnet 11, can secure the permanent magnet 11 within the slot 101. This restricts the circumferential freedom of the permanent magnet 11, reducing the impact of adhesive aging on circumferential movement of the permanent magnet 11 in related technologies. In other words, the permanent magnet slot 101 can accurately and conveniently indicate the position of the permanent magnet 11, and also strengthen the fixation of the permanent magnet 11, preventing circumferential movement and avoiding any impact on motor performance. Furthermore, the permanent magnet slot in this embodiment can be formed by stamping. Stamped permanent magnet slots 101 have a more regular shape, ensuring the fitting accuracy between the permanent magnet 11 and the slot, reducing assembly errors, and improving the overall stability and reliability of the motor.

[0033] In this embodiment, the cross-section of the permanent magnet groove 101 and the cross-section of the permanent magnet 11 are both fan-shaped.

[0034] It is worth noting that both the permanent magnet groove 101 and the permanent magnet 11 have a fan-shaped cross-section, which ensures a high degree of shape matching between them, improving assembly accuracy and reducing the impact of machining errors. Furthermore, stamping to form a fan-shaped groove is relatively easy and has low manufacturing costs, while also facilitating mass production and improving production efficiency. Depending on the specific implementation environment, it can also be trapezoidal or other shapes. This embodiment is merely an example of a specific structural type and does not constitute a limitation.

[0035] In this embodiment, the included angle between the large-diameter end face of the permanent magnet 11 and the side wall is α, where α ≤ 90°.

[0036] In this embodiment, the included angle between the bottom end of the permanent magnet groove 101 and the side wall of the permanent magnet groove 101 is β, where β = α.

[0037] Understandably, when the angle β between the bottom end of the permanent magnet slot 101 and the sidewall of the permanent magnet slot 101 is equal to the angle α between the large-diameter end face of the permanent magnet 11 and the sidewall, the large-diameter end face of the permanent magnet 11 can fit more tightly against the bottom of the slot, allowing it to be better positioned in both the circumferential and radial directions, thus avoiding displacement or loosening caused by vibration or electromagnetic force during operation. Simultaneously, this dimensional design allows the permanent magnet 11 to be more accurately embedded in the slot, reducing machining and assembly errors, improving the consistency of motor manufacturing, and ensuring stable motor performance.

[0038] Optionally, β ≥ 60°.

[0039] Specifically, if β is too small, the bottom and shoulder of the permanent magnet slot 101 will become too sharp, which can easily lead to stress concentration and increase the risk of material fatigue, cracking, or damage to the slot bottom and shoulder during long-term operation. However, β ≥ 60° allows the slot bottom and shoulder to have a more reasonable thickness, improving mechanical strength and enhancing the durability and stability of the motor.

[0040] In this embodiment, the connection between the opening of the permanent magnet groove 101 and the sidewall is rounded.

[0041] It is worth noting that designs using right angles or sharp transitions are prone to stress concentration under load, especially during high-speed motor operation and prolonged use, which may lead to fatigue, cracking, or damage to the slot wall material. Rounded corner transitions, on the other hand, can effectively disperse stress, improve the mechanical strength of the slot wall, and extend the motor's service life. Furthermore, rounded corner transitions can reduce friction and stress during installation, improve the assembly accuracy of the permanent magnet 11, and prevent loosening or detachment due to assembly errors.

[0042] Please refer to Figure 4 In one embodiment of this invention, there is a first accommodating gap (not marked in the figure) between the permanent magnet 11 and the permanent magnet groove 101. The first accommodating gap is continuous and is an open cavity structure without filling medium, so as to allow the cooling medium from the outside to pass through.

[0043] It should be noted that this structural configuration makes the permanent magnet synchronous motor suitable for oil cooling, allowing the cooling medium (e.g., oil) to flow into the first accommodating gap to directly cool the permanent magnet 11, reducing the loss of the permanent magnet 11 and achieving cost reduction of the permanent magnet 11.

[0044] Please refer to Figure 5 In another embodiment of this invention, a second receiving gap is provided between the permanent magnet 11 and the permanent magnet groove 101, and the second receiving gap is filled with adhesive.

[0045] It should be noted that this structural design can further fix the permanent magnet 11 and improve its stability after fixation.

[0046] In this embodiment, a stator core 12 is also included, which is located near the opening end of the permanent magnet slot 101.

[0047] Optionally, the depth of the permanent magnet groove 101 is d, where d ≥ 0.8 mm.

[0048] Specifically, the depth of the permanent magnet slot 101 should not be too small (less than 0.8mm), as this will cause the permanent magnet to be placed unstable, affecting the performance of the permanent magnet synchronous motor. At the same time, the slot depth should not be too large, as this will weaken the effective material thickness of the rotor core 10, reducing its mechanical strength and making it prone to deformation, breakage, or damage during high-speed rotation or under stress. Limiting its depth ensures that the rotor core 10 has sufficient rigidity and strength, improving the reliability and service life of the motor. It also has the advantages of optimizing the magnetic circuit, improving heat dissipation performance, and reducing processing difficulty.

[0049] This utility model also provides a drive motor assembly, including the surface-mounted external rotor permanent magnet synchronous motor 100 as described above, which has all its beneficial effects.

[0050] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0051] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0052] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention shown herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0053] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0054] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0055] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0056] The above description of the embodiments shown in this utility model (including the content in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments of the utility model, and such modifications will be within the spirit and scope of the utility model.

[0057] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A surface-mounted outer rotor permanent magnet synchronous motor, characterized by, The application relates to a surface-mounted outer rotor permanent magnet synchronous motor. The rotor core has a permanent magnet slot; The permanent magnet is arranged in the permanent magnet slot and has a profile matched with that of the permanent magnet slot; The bottom end of the permanent magnet slot faces the outer edge of the rotor core, the open end of the permanent magnet slot faces the air gap, the bottom end is a large-diameter end, the open end is a small-diameter end, and the large-diameter end surface of the permanent magnet is close to the bottom end of the permanent magnet slot to limit the freedom of the permanent magnet in the circumferential direction.

2. The surface-mounted outer rotor permanent magnet synchronous motor according to claim 1, characterized by, The cross section of the permanent magnet slot and the cross section of the permanent magnet are both sector-shaped.

3. The surface-mounted outer rotor permanent magnet synchronous motor according to claim 1, characterized by, The included angle between the large-diameter end surface of the permanent magnet and the side wall is alpha, and alpha is less than or equal to 90 degrees.

4. The surface-mounted outer rotor permanent magnet synchronous motor according to claim 3, characterized by, The included angle between the bottom end of the permanent magnet slot and the side wall of the permanent magnet slot is beta, and beta is equal to alpha.

5. The surface-mounted outer rotor permanent magnet synchronous motor according to claim 4, characterized by, β≥60°。 6. The surface-mounted outer rotor permanent magnet synchronous motor according to claim 1, characterized by, The connecting part between the opening of the permanent magnet slot and the side wall is roundly transitioned.

7. The surface-mounted outer rotor permanent magnet synchronous motor according to claim 1, characterized by, The first accommodation gap between the permanent magnet and the permanent magnet slot is continuously through and is an open cavity structure without filling medium, so that cooling medium from outside can enter.

8. The surface-mounted outer rotor permanent magnet synchronous motor according to claim 1, characterized by, The second accommodation gap between the permanent magnet and the permanent magnet slot is filled with adhesive.

9. The surface-mounted outer rotor permanent magnet synchronous motor according to claim 1, characterized by, The slot depth of the permanent magnet slot is d, and d is greater than or equal to 0.8 mm.

10. A drive motor assembly characterized by, The application further relates to a surface-mounted outer rotor permanent magnet synchronous motor comprising any one of the above-mentioned surface-mounted outer rotor permanent magnet synchronous motors.

Images