Closed external rotor motor

Abstract

The utility model provides a closed external rotor motor, which comprises a base, a stator assembly, a rotor assembly, a fixed shaft and a bearing assembly, the rotor assembly surrounds the periphery of the stator assembly, and the rotor assembly and the base jointly form a space, so that the stator assembly is closed in the space. According to the utility model, the rotor assembly of the motor and the base form the space together, so that the stator assembly is sealed in the space, and sealing protection can be provided for the stator assembly while the rotor assembly is ensured to rotate.

Description

Technical Field

[0001] The utility model relates to the field of motor manufacturing, in particular to a closed outer rotor motor. Background Art

[0002] Outer rotor motors are often used for output rotation of fan-type electrical appliances. In the prior art, the stator assembly of the outer rotor motor is mounted on an electrical appliance support, and the rotor assembly is connected to the fan blades, thereby driving the fan blades to rotate. However, the outer rotor motors of the prior art still have problems of poor sealing and protection, which makes the internal electrical components of the motor easy to be damaged and oxidized and corroded during transportation and use, affecting the service life and safety. In addition, the prior art also needs to improve the rotation stability of the fan blades driven by the rotor assembly. Utility Model Content

[0003] The utility model provides a closed outer rotor motor.

[0004] Specifically, the utility model is realized by the following technical solutions:

[0005] The utility model provides a closed outer rotor motor, comprising:

[0006] Pedestal;

[0007] A stator assembly is arranged on the base;

[0008] A rotor assembly surrounds the outer periphery of the stator assembly, wherein the rotor assembly and the base together form a space, thereby enclosing the stator assembly in the space;

[0009] A fixed shaft, arranged on the base;

[0010] The bearing assembly is arranged between the fixed shaft and the rotor assembly to support the rotor assembly to rotate and output around the fixed shaft.

[0011] In some embodiments, the base includes a seat portion and a barrel portion, and the fixed shaft is inserted into the barrel portion.

[0012] In some embodiments, the base includes a seat portion and a barrel portion, and the stator assembly is disposed against an outer periphery of the barrel portion.

[0013] In some embodiments, a mounting structure is formed at the upper end of the fixed shaft, and the mounting structure extends out of the bearing assembly.

[0014] In some embodiments, the rotor assembly includes a shell portion and a magnetic portion, the shell portion covers the base to form the space, and the magnetic portion is disposed on an inner wall of the shell portion.

[0015] In some embodiments, the rotor assembly further comprises a sleeve, the top of the shell is formed with an opening, the sleeve is connected to the opening of the shell and is sleeved outside the fixed shaft, and the bearing assembly is supported between the sleeve and the fixed shaft.

[0016] In some embodiments, the sleeve portion includes an outer convex ring, and the outer convex ring is mounted on the top of the shell portion.

[0017] In some embodiments, the sleeve portion includes an inner convex ring, and the bearing set includes a pair of bearings, and the pair of bearings are separated by the inner convex ring.

[0018] In some embodiments, a recess is formed at the bottom of the base, the fixed shaft forms a hollow, and the recess is communicated with the hollow.

[0019] In some embodiments, an electrical connection port is provided at an outer edge of the base, a circuit board is provided on the base and located in the space, and the electrical connection port is connected to the circuit board.

[0020] According to an embodiment of the utility model, the rotor assembly of the motor and the base are used to form a space together, so that the stator assembly is enclosed in the space, ensuring that the rotor assembly can provide closed protection for the stator assembly while rotating; in addition, the fixed shaft is arranged on the base to remain stationary, and the rotor assembly is rotatably supported on the fixed shaft by bearings, ensuring that the rotor assembly drives the fan blades to rotate smoothly.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] Figure 1 is a schematic diagram of a closed outer rotor motor in an embodiment of the utility model from a first viewing angle;

[0024] Figure 2 is a schematic diagram of a second viewing angle of a closed outer rotor motor in an embodiment of the utility model;

[0025] Figure 3 It is a front view of a closed outer rotor motor in one embodiment of the utility model;

[0026] Figure 4 yes Figure 3 Sectional view along AA direction;

[0027] Figure 5It is an exploded view of a part of the structure of a closed outer rotor motor in one embodiment of the utility model;

[0028] Figure 6 It is an exploded view of another part of the structure of the enclosed outer rotor motor in one embodiment of the utility model.

[0029] Reference numerals:

[0030] 11: seat; 12: barrel; 13: mounting portion; 14: electrical connection port; 15: recess;

[0031] 21: coil; 22: cover;

[0032] 31: shell; 32: magnetic part; 33: sleeve; 331: outer convex ring; 332: inner convex ring;

[0033] 40: fixed shaft; 41: shaft portion; 42: platform portion; 43: threaded portion;

[0034] 51: first bearing; 52: second bearing; 53: washer. DETAILED DESCRIPTION

[0035] The present invention will now be discussed with reference to several embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present invention, rather than implying any limitation on the scope of the present invention.

[0036] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to"; the terms "embodiment" and "one embodiment" are to be interpreted as "at least one embodiment"; the term "another embodiment" is to be interpreted as "at least one other embodiment"; the terms "first", "second", etc. may refer to different or the same objects; the term "setting" is not limited to direct connection or indirect connection, nor is it limited to a specific connection method. Other explicit and implicit definitions may also be included below.

[0037] In the following description, some specific numerical values ​​or numerical ranges may be involved. It should be understood that these numerical values ​​and numerical ranges are merely exemplary, which may be helpful in putting the idea of ​​the present utility model into practice. However, the description of these examples is not intended to limit the scope of the present utility model in any way. According to specific application scenarios and requirements, these numerical values ​​or numerical ranges can be set separately.

[0038] As mentioned above, the external rotor motor in the prior art still has the problem of poor sealing, and the rotation stability of the rotor assembly driving the fan blades also needs to be improved. The utility model at least solves the above problems. Figure 1-6As shown, the enclosed outer rotor motor of the embodiment of the utility model generally includes a base, a stator assembly, a rotor assembly, a fixed shaft 40 and a bearing assembly. Among them, the stator assembly 20 and the rotor assembly 30 are used to generate output torque when energized, the fixed shaft 40 is used to support the rotor assembly to rotate stably through the bearing assembly, the base is used to carry the stator assembly, the rotor assembly and the fixed shaft 40, and is also used to fix the outer rotor motor as a whole with the bracket of the fan-like electrical appliance through the base, so as to drive the fan blades to rotate through the rotor assembly.

[0039] Base

[0040] The base is used to carry the stator assembly, and therefore, the base includes at least a seat 11 capable of stably mounting the stator assembly. In one embodiment, the seat 11 may be substantially disc-shaped, or may be any other shape, as long as the upper surface of the seat 11 has a structure for stably placing or fixing the stator assembly. Exemplarily, the upper surface of the seat 11 may be a plane, and the coil 21 of the stator assembly is directly placed on the plane; the upper surface of the seat 11 may also be formed as an annular inner groove, and the bottom contour of the annular coil 21 matches the groove contour, which can improve the tightness of the fit between the coil 21 and the seat 11.

[0041] In one embodiment, an annular outer groove may also be formed on the upper surface of the seat 11. Since the rotor assembly and the seat 11 together form a closed space, in order to avoid interference between the rotor assembly and the seat 11 during rotation, a redundant amount is formed by the outer groove to allow the rotor assembly to penetrate deeper without affecting the rotation.

[0042] In one embodiment, a mounting portion 13 is formed on the outer edge of the seat 11. Exemplarily, the mounting portion 13 may be a bolt seat, and the base is mounted on the electrical bracket by bolts. In addition, the mounting portion 13 may also be a structure for riveting, welding, etc.

[0043] The base is used to install the fixed shaft 40, so the base at least includes a structure that can stably install the fixed shaft 40. In one embodiment, a through hole is formed in the central area of ​​the seat 11, and the fixed shaft 40 is directly inserted into the through hole. Exemplarily, the fixed shaft 40 and the through hole can be connected by welding or integral molding. The through hole can be circular or non-circular, and the fixed shaft 40 and the through hole can be matched in a corresponding shape. In another embodiment, the central area of ​​the bottom can also be a plane or a countersunk hole, and the bottom end of the fixed shaft 40 is directly set on the plane or the bottom of the countersunk hole, and the fixed shaft 40 and the seat 11 are fixedly connected by welding or integral molding.

[0044] In another embodiment, a central area of ​​the seat 11 extends upward to form a barrel 12, the inner diameter of the barrel 12 matches the outer diameter of the fixed shaft 40, and the fixed shaft 40 can be inserted into the barrel 12 and form an interference fit. A larger fitting area is formed between the barrel 12 and the fixed shaft 40, thereby improving the connection stability between the fixed shaft 40 and the base.

[0045] The base is used to set the circuit board. In one embodiment, an electrical connection port 14 is also formed on the outer edge of the seat 11. The circuit board is directly set on the upper surface of the seat 11, and an electrical connection is formed between the electrical connection port 14 and the circuit board. Since the circuit board is set on the upper surface of the seat 11, the circuit board and the coil 21 are sealed by the rotor assembly to prevent the circuit board and the coil 21 from being damaged by external forces, and the life of the circuit board and the coil 21 is affected by water immersion and dust damage.

[0046] In one embodiment, the base material may be a metal material, such as aluminum alloy, casting, zinc alloy, etc., or may be a resin, nylon, or plastic material.

[0047] Stator components

[0048] The stator assembly includes a coil 21 , which is wound around an iron core to form a stator winding. In one embodiment, a cover 22 is provided on the top of the coil 21 . The cover 22 is made of a plastic BMC material and is used to cover and protect the coil 21 .

[0049] In one embodiment, the inner edge of the annular coil 21 is tightly against the outer periphery of the barrel 12, that is, another function of the barrel 12 is to provide stable installation for the coil 21. As mentioned above, the coil 21 cooperates with the inner groove at the bottom and cooperates with the outer periphery of the barrel 12 at the inner edge, further ensuring the stability of the coil 21. In another embodiment, the inner edge of the annular coil 21 may not be against the outer periphery of the barrel 12. In this case, the coil 21 is positioned only by the cooperation between the bottom and the inner groove.

[0050] Fixed shaft 40

[0051] The fixed shaft 40 is used to provide rotational support for the rotor assembly through the bearing assembly, so the fixed shaft 40 needs to have good structural strength. In one embodiment, the bottom area of ​​the fixed shaft 40 is inserted into the barrel 12, and the length range of the interference fit with the barrel 12 is increased as much as possible, so as to transfer the force carried by the fixed shaft 40 to the barrel 12 and the seat 11 to the greatest extent. Exemplarily, at least 1 / 3 of the length range of the fixed shaft 40 is inserted into the barrel 12.

[0052] In some applications, the fixed shaft 40 can also be used to install accessories of electrical appliances. For example, the display screen of a fan-type electrical appliance can be installed on the top of the fixed shaft 40, thereby simplifying the installation space and structure of the display screen. Therefore, it is necessary to set a display screen installation structure on the top of the fixed shaft 40. In one embodiment, the fixed shaft 40 is formed as a shaft portion 41 at least at the position where the bearing assembly is set. The shaft portion 41 is cylindrical so that it is easy to install the bearing assembly. The fixed shaft 40 is formed with a platform portion 42 above the shaft portion 41 for matching with the special-shaped hole of the display screen; the shaft end of the fixed shaft 40 is also formed with a threaded portion 43. When in use, the platform portion 42 is passed through the special-shaped hole of the display screen, and the installation between the display screen and the fixed shaft 40 is completed by screwing the nut and the threaded portion 43.

[0053] In one embodiment, the fixed shaft 40 is configured as a hollow shaft, and accordingly, the central area of ​​the seat 11 is formed with an opening that is the same as the inner cavity of the hollow shaft, thereby ensuring that the electrical connection wires of the display screen can be electrically connected to the display screen through the inner cavity of the hollow shaft. Exemplarily, the opening in the central area of ​​the seat 11 can be formed as a concave portion 15, which is conducive to integrally forming the opening and the barrel 12, or a convex portion or a plane, as long as the opening is connected to the inner cavity of the fixed shaft 40.

[0054] Rotor assembly

[0055] The rotor assembly is used to drive the fan blades to rotate, and can form a closed space together with the base. In one embodiment, the rotor assembly includes at least a shell 31 and a magnetic part 32. The shell 31 is formed as a cylinder as a whole and covers the seat 11 to seal and protect the coil 21 and the circuit board. The magnetic part 32 is arranged inside the shell 31. The magnetic part 32 is usually a permanent magnet, which is used to generate an induction torque with the coil 21 and drive the shell 31 to rotate.

[0056] In one embodiment, the fan blades may be directly fixed on the shell 31 . For example, the fan blades are mounted on the upper surface of the shell 31 by bolts, or may be mounted on the outer surface of the shell 31 .

[0057] When the fan blades are installed on the upper surface of the shell 31, a structure can also be designed to radially position the fan blades with respect to the rotating shaft. In one embodiment, the rotor assembly can also include a sleeve 33, which is connected to the opening at the top of the shell 31. Exemplarily, the sleeve 33 is fixedly connected to the shell 31 by riveting. The sleeve 33 is formed into a cylindrical shape as a whole, and an outer convex ring 331 is provided on the outer edge of the cylinder. The outer convex ring 331 is integrally mounted on the top of the shell 31 to cover the opening at the top of the shell 31, thereby ensuring the sealing of the top of the shell 31. On the other hand, the outer edge of the outer convex ring 331 can be pressed against the inner edge of the fan blade, thereby positioning the fan blade in the radial direction of the rotating shaft.

[0058] The sleeve 33 is also used to stably install the bearing assembly. In one embodiment, an inner convex ring 332 is formed on the inner periphery of the sleeve 33. The bearing assembly is composed of a first bearing 51 and a second bearing 52 to form a double bearing structure. The first bearing 51 is limited to the upper side of the inner convex ring 332 by a washer 53, and the second bearing 52 is limited to the lower side of the inner convex ring 332, thereby providing a good installation structure for the double bearing assembly through the inner convex ring 332. In this case, in the axial direction of the shaft, the transmission force position of the bearing assembly and the fan blade to the rotor assembly is close, which can maximize the complexity of the bearing assembly bearing the fan blade, thereby ensuring the stable rotation of the fan blade.

[0059] The description of the embodiments herein and any reference to directions and orientations are only for the convenience of description and are not to be construed as any limitation on the scope of protection of the present invention. The description of the preferred embodiments may involve combinations of features, which may exist independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A closed outer rotor motor, characterized in that: include: Pedestal; A stator assembly is arranged on the base; A rotor assembly surrounds the outer periphery of the stator assembly, wherein the rotor assembly and the base together form a space, thereby enclosing the stator assembly in the space; A fixed shaft (40) is arranged on the base; A bearing assembly is arranged between the fixed shaft (40) and the rotor assembly, and is suitable for supporting the rotor assembly to rotate and output around the fixed shaft.

2. The enclosed outer rotor motor according to claim 1, characterized in that: The base comprises a seat portion (11) and a barrel portion (12), and the fixed shaft (40) is inserted into the barrel portion (12).

3. The enclosed outer rotor motor according to claim 1, characterized in that: The base comprises a seat portion (11) and a barrel portion (12), and the stator assembly is arranged against the outer periphery of the barrel portion (12).

4. The enclosed outer rotor motor according to claim 1, characterized in that: A mounting structure is formed at the upper end of the fixed shaft (40), and the mounting structure extends out of the bearing assembly.

5. The enclosed outer rotor motor according to claim 1, characterized in that: The rotor assembly comprises a shell portion (31) and a magnetic portion (32); the shell portion (31) covers the base to form the space; and the magnetic portion (32) is arranged on the inner wall of the shell portion (31).

6. The enclosed outer rotor motor according to claim 5, characterized in that: The rotor assembly further comprises a sleeve (33), an opening is formed at the top of the shell (31), the sleeve (33) is connected to the opening of the shell (31) and is sleeved outside the fixed shaft (40), and the bearing assembly is supported between the sleeve (33) and the fixed shaft (40).

7. The enclosed outer rotor motor according to claim 6, characterized in that: The sleeve portion (33) comprises an outer convex ring (331), and the outer convex ring (331) is mounted on the top of the shell portion (31).

8. The enclosed outer rotor motor according to claim 6, characterized in that: The sleeve portion (33) includes an inner convex ring (332), and the bearing set includes a pair of bearings, wherein the pair of bearings are separated by the inner convex ring (332).

9. The enclosed outer rotor motor according to claim 1, characterized in that: The bottom of the base is formed with a recess (15), the fixed shaft (40) is formed with a hollow, and the recess (15) is communicated with the hollow.

10. The enclosed outer rotor motor according to claim 1, characterized in that: An electrical connection port (14) is arranged on the outer edge of the base, a circuit board is arranged on the base and located in the space, and the electrical connection port (14) is connected to the circuit board.

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