Outer rotor three-phase direct current brushless motor

Abstract

The utility model discloses an outer rotor three-phase direct current brushless motor, which comprises a rotor assembly, a stator assembly, a support and fan blades, the rotor assembly comprises a casing, a rotating shaft and a magnet, the stator assembly is arranged on the support, the casing covers the outer side of the stator assembly, the magnet is fixed on the inner wall of the casing, the rotating shaft penetrates through the stator assembly and the casing and then extends out, and the fan blades are arranged on the rotating shaft. And the fan blades are fixed on the shell. The fan blades are directly fixed on the shell, so that the situation that the fan blades are fixed on a rotating shaft in the prior art is replaced, the rotating shaft in the motor does not need to extend out to be matched with the fan blades, the length of the whole motor is correspondingly reduced, the size of the whole motor is reduced, the requirement for the installation space of the motor is reduced, and installation is convenient; the whole motor is simple in structure, and the whole production cost can be reduced.

Description

Technical Field

[0001] The utility model belongs to a motor, in particular to an outer rotor three-phase DC brushless motor. Background Art

[0002] When installing the existing brushless DC motors used in home appliances such as air fryers, electric ovens, and microwave ovens, the fan blades are usually installed on the rotating shaft. The two ends of the rotating shaft extend through the two ends of the housing, one end is used as the power output, and the other end is used to install the fan blades. For example, application number 201920658403.3 discloses a brushless DC motor with fan blades installed at the top of the rotating shaft, and application number 201720703296.2 discloses a brushless DC motor with fan blades installed at the end of the rotor shaft. In order to have enough installation space for the fan blades and ensure the normal rotation of the fan blades, this type of motor needs to extend the rotating shaft at one end for installing the fan blades longer, thereby increasing the size of the entire motor. A larger installation space needs to be reserved on the home appliance to install the entire motor, which is inconvenient for installation in smaller home appliances. Utility Model Content

[0003] The purpose of the present utility model is to provide an outer rotor three-phase DC brushless motor that can solve at least one of the above problems.

[0004] According to one aspect of the present invention, an outer rotor three-phase DC brushless motor is provided, comprising a rotor assembly, a stator assembly, a bracket and fan blades, the rotor assembly comprising a casing, a rotating shaft and a magnet, the stator assembly being arranged on the bracket, the casing cover being arranged on the outside of the stator assembly, the magnet being fixed to the inner wall of the casing, the rotating shaft extending after passing through the stator assembly and the casing, and the fan blades being fixed to the casing.

[0005] The beneficial effects of the present invention are as follows: by directly fixing the fan blades on the casing, the fan blades are fixed on the rotating shaft instead of the prior art. There is no need to extend the rotating shaft in the motor to cooperate with the fan blades, so that the length of the entire motor is reduced accordingly, and the volume of the entire motor is reduced, thereby reducing the installation space requirement for the motor and facilitating installation; the entire motor structure is simple, which is conducive to reducing the overall production cost.

[0006] In some embodiments, the fan blade includes a body and blades, the blades are arranged on the body, the body is provided with a through hole, the housing is located in the through hole, and the body cover is fixed to the housing. Thus, the through hole facilitates the fitting and fixing of the fan blade on the housing.

[0007] In some embodiments, a folded edge is provided at one end of the body, and the folded edge abuts against a corresponding end surface of the housing. Thus, by providing the folded edge, the relative installation position of the fan blade on the housing can be easily defined.

[0008] In some embodiments, the stator assembly includes a stator frame and windings. The stator frame is fixed to a bracket and is provided with stator slots, with the number of stator slots being 6, 9, or 12. The windings are wound around the stator slots, and the magnets are 10-pole, 4-pole, 6-pole, 8-pole, 12-pole, 14-pole, or 16-pole. Thus, by configuring the number of stator slots, windings, and magnets, a three-phase full-wave drive operation of the motor is achieved, thereby reducing electromagnetic noise and achieving a certain degree of silencing.

[0009] In some embodiments, the outer rotor three-phase brushless DC motor further includes a bearing. A mounting post is provided on the bracket, and the mounting post is provided with a first mounting hole and a second mounting hole that are interconnected. The first mounting hole is provided with two holes, one at each end of the second mounting hole, and the second mounting hole has a smaller diameter than the first mounting hole. The bearing is located in one of the first mounting hole and the second mounting hole. Thus, by providing first and second mounting holes with different diameters, different types of bearings can be installed, thereby improving the versatility of the bracket.

[0010] In some embodiments, a stopper is provided on the outer periphery of the mounting post, and a stopper groove is provided on the inner wall of the stator frame, wherein the stopper groove and the stopper groove cooperate with each other. Thus, the cooperation between the stopper groove and the stopper groove facilitates the cooperation between the stator frame and the mounting post.

[0011] In some embodiments, the outer rotor three-phase brushless DC motor further includes a drive control board electrically connected to the stator assembly. Thus, the drive control board facilitates control of the motor speed to meet different usage requirements.

[0012] In some embodiments, the bracket is provided with multiple legs on its periphery. Each leg has a fixing hole at one end away from the mounting post, and a shock-absorbing pad is provided in the fixing hole. Thus, the fixing holes facilitate the installation and fixation of the bracket, and the shock-absorbing pad provides a vibration-absorbing effect, further reducing noise.

[0013] In some embodiments, the bracket is provided with a mounting slot, wherein a U-shaped slot is provided on one side of the bracket, the U-shaped slot being located on one side of the mounting slot, and the drive control board is located within the mounting slot. Thus, the provision of the mounting slot facilitates the fixed installation of the drive control board, improves the rationality of the structural distribution, and helps reduce the overall volume.

[0014] In some embodiments, the bracket is provided with a wire outlet hole, and the drive control board and the stator assembly are electrically connected via wires, and the wires for connecting the drive control board and the stator assembly pass through the wire outlet hole. Thus, by providing the wire outlet hole, a tangled mess of wires is effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of one embodiment of the outer rotor three-phase DC brushless motor of the present utility model.

[0016] Figure 2 It is a structural schematic diagram of another embodiment of the outer rotor three-phase DC brushless motor of the present utility model.

[0017] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure.

[0018] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure.

[0019] Figure 5 This is a structural diagram of one of the real-time modes of the rotor in the outer rotor three-phase DC brushless motor of the utility model.

[0020] Figure 6 It is a structural schematic diagram of another embodiment of the rotor in the outer rotor three-phase DC brushless motor of the present invention.

[0021] Figure 7 It is a structural schematic diagram of one embodiment of the bracket in the outer rotor three-phase DC brushless motor of the present invention.

[0022] Figure 8 It is a structural schematic diagram of the bracket in the outer rotor three-phase DC brushless motor of the utility model from another perspective.

[0023] Figure 9 yes Figure 7 Schematic diagram of the cross-sectional structure.

[0024] Figure 10 It is a structural schematic diagram of another embodiment of the fan blade in the outer rotor three-phase DC brushless motor of the utility model. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] Reference Figures 1 to 4 The outer rotor three-phase brushless DC motor includes a rotor assembly 1, a stator assembly 2, a bracket 3 and a fan blade 4. The rotor assembly 1 includes a housing 11, a rotating shaft 12 and a magnet 13. The stator assembly 2 is arranged on the bracket 3. The housing 11 is covered on the outside of the stator assembly 2. The magnet 13 is fixed to the inner wall of the housing 11. The rotating shaft 12 passes through the stator assembly 2 and the housing 11 and then extends out. The fan blade 4 is fixed to the housing 11. Among them, the magnet 13 is a whole magnetic ring, which is set on the inner wall of the housing 11 and is located on the outer periphery of the stator assembly 2 (such as Figure 5 The magnet 13 may also be a ferromagnetic magnetic sheet, which may be a plurality of pieces evenly distributed on the inner wall of the housing 11 (eg Figure 6 During assembly, the magnet 13 is fixed to the inner wall of the housing 11 by gluing, thereby securing the magnet 13.

[0027] When the outer rotor three-phase brushless DC motor is in use, the bracket 3 is fixed in the desired installation position, so that the entire motor is fixed. When the rotating shaft 12 rotates, it drives the housing 11 to rotate synchronously, and the fan blades 4 fixed to the housing 11 also rotate. The rotation of the fan blades 4 generates airflow, accelerates air flow, and plays a role in heat dissipation.

[0028] Among them, Figure 5 and Figure 6 As shown, the stator assembly 2 includes a stator frame 21 and windings 22. The stator frame 21 is fixed to the bracket 3 and is provided with stator slots 211. The number of stator slots 211 is 6, 9, or 12. The windings 22 are wound around the stator slots. The magnets 13 have 10 poles, 4 poles, 6 poles, 8 poles, 12 poles, 14 poles, or 16 poles. By adopting a three-phase full-wave drive, compared with the single-phase motors used in some existing small household appliances, such as air fryers and steam ovens, noise is greatly reduced, improving the user experience.

[0029] like Figure 1 、 Figure 2 The fan blade 4 includes a body 41 and blades 42. The blades 42 are mounted on the body 41. The body 41 has a through-hole 411. The housing is located within the through-hole 411. The body 41 is fixed to the housing 11. The fan blade 4 is an integrated structure, which improves the integrity of the fan blade 4 and facilitates its production and processing. To improve the tightness of the fit between the fan blade 4 and the housing 11, glue is applied to the inner wall of the through-hole 411, further securing the through-hole 411 to the housing 11 through the adhesive, thereby facilitating the synchronous rotation of the housing 11 by the fan blade 4.

[0030] One end of the body 41 is provided with a folded edge 43, which abuts against the corresponding end face of the housing 11. Therefore, when the fan blade 4 is engaged with the housing 11, the through hole 411 is sleeved on the outside of the housing 11. When the folded edge 43 abuts against the end face of the housing 11, the fan blade 4 and the housing 11 are properly engaged, completing the engagement.

[0031] In one embodiment, the blades 42 are arranged vertically and along the axial direction of the housing 11. Therefore, when the blades 42 rotate, they can drive air flow and achieve a heat dissipation effect. In this embodiment, the fan blades 4 are metal parts obtained by stamping. The blades 42 can be formed upward or downward, and the choice can be made accordingly according to actual usage requirements.

[0032] In another embodiment, the blades 42 are arranged in an arc shape (eg Figure 10 As shown), in this embodiment, the fan blade 4 is an injection molding structure, which is convenient for molding and meets the curvature requirements of the blade 42.

[0033] like Figure 3 、 Figure 4 、 Figure 8 and Figure 9 As shown, the outer rotor three-phase DC brushless motor of the present invention also includes a bearing 5. A mounting post 31 is provided on the bracket 3. The mounting post 31 is provided with a first mounting hole 311 and a second mounting hole 312 that are interconnected. There are two first mounting holes 311, which are respectively located at the two ends of the second mounting hole 312. The aperture of the second mounting hole 312 is smaller than the aperture of the first mounting hole 311. The bearing 5 is located in the first mounting hole 311 or the second mounting hole 312. The bearing 5 can be a rolling bearing or a sliding bearing. When a rolling bearing is used, there are two rolling bearings, which are respectively sleeved and installed in the two first mounting holes 311, and then the rotating shaft 12 is sleeved in the rolling bearing (such as Figure 4 When the bearing 5 is a sliding bearing, the sliding bearing is sleeved in the second mounting hole 312, and then the rotating shaft 12 is sleeved in the sliding bearing (as shown). Figure 3 By providing the bearing 5, wear between the rotating shaft 12 and the bracket 3 can be avoided when the rotating shaft 12 rotates relative to the bracket 3, and the friction force on the rotating shaft 12 during rotation is reduced, which is conducive to reducing noise and increasing the service life of the rotating shaft 12.

[0034] Bracket 3 and mounting post 31 can be die-cast or integrally injection-molded. When die-casting is employed, frame 1 can be made of a metal such as aluminum alloy, aluminum, or zinc alloy. To improve heat dissipation throughout the motor, multiple cooling holes are provided on the end surface of bracket 3 to facilitate air convection and enhance heat dissipation efficiency.

[0035] A stopper 313 is integrally formed on the outer periphery of the mounting post 31. A stopper slot 212 is defined on the inner wall of the stator frame 21, which mates with the stopper 313. During installation, the stator frame 21 is fitted over the outer periphery of the mounting post 31, securing the stopper slot 212 and the stopper 313. The stator frame 21 is then secured to the bracket 3 by gluing.

[0036] like Figure 1 As shown, the outer rotor three-phase brushless DC motor further includes a drive control board 6, which is electrically connected to the stator assembly 2 via a wire. The drive control board 6 is a control circuit board of the prior art, which can adjust and control the speed of the motor.

[0037] The outer periphery of the bracket 3 is integrally injection molded with a plurality of legs 32. Each leg 32 is provided with a fixing hole 321 at one end away from the mounting column 31. A shock-absorbing pad 7 is provided in the fixing hole 321, wherein the shock-absorbing pad 7 is made of rubber. When the entire motor needs to be installed and fixed, the shock-absorbing pad 7 is sleeved in the fixing hole 321, and then the external screw is passed through the shock-absorbing pad 7 and tightened, thereby tightening the bracket 3 to the corresponding position. By providing the shock-absorbing pad 7, the vibration of the bracket 3 can be transmitted to the installation position in a smaller manner under the shock-absorbing effect of the shock-absorbing pad 7, thereby playing a shock-absorbing role and helping to reduce noise. In actual use, for scenarios where noise requirements are not high, the shock-absorbing pad 7 can be removed to simplify the installation of the entire bracket 3.

[0038] like Figure 1 、 Figure 7 and Figure 8 As shown, in some embodiments, the bracket 3 is provided with a mounting groove 33, and a U-shaped groove 34 is provided on one side of the bracket 3. The U-shaped groove 34 is located on one side of the mounting groove 33, and the drive control board 6 is located in the mounting groove 33. When installing, the drive control board 6 is placed in the mounting groove 33 and then fastened to the bracket 3 with screws; the front end of the drive control board 6 extends through the U-shaped groove 34 to facilitate the connection of external wires to the drive control board 6.

[0039] In some embodiments, the bracket 3 is provided with a wire outlet 35. The drive control board 6 is electrically connected to the stator assembly 2 via wires, which pass through the wire outlet 35. In this embodiment, the drive control board 6 is located outside the bracket 3. Therefore, the wires passing through the wire outlet 35 are electrically connected to the windings. The wire outlet 35 conveniently guides the wires and avoids cluttered wiring. When the drive control board 6 is located outside the bracket 3, the shape of the drive control board 6 can be square or round to accommodate motors of varying power.

[0040] The above are only preferred embodiments of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. Outer rotor three-phase brushless DC motor, characterized in that, The invention comprises a rotor assembly (1), a stator assembly (2), a bracket (3) and a fan blade (4), wherein the rotor assembly (1) comprises a housing (11), a rotating shaft (12) and a magnet (13), the stator assembly (2) is arranged on the bracket (3), the housing (11) is covered on the outside of the stator assembly (2), the magnet (13) is fixed to the inner wall of the housing (11), the rotating shaft (12) extends after passing through the stator assembly (2) and the housing (11), and the fan blade (4) is fixed to the housing (11); The fan blade (4) comprises a body (41) and blades (42), the blades (42) being arranged on the body (41), the body (41) being provided with a through hole (411), the housing being located in the through hole (411), and the body (41) being covered and fixed on the housing (11); One end of the body (41) is provided with a folded edge (43), and the folded edge (43) abuts against a corresponding end surface of the housing (11); The stator assembly (2) comprises a stator frame (21) and a winding (22), wherein the stator frame (21) is fixed on a bracket (3), and stator slots (211) are provided on the stator frame (21), wherein the number of the stator slots (211) is 6 slots, 9 slots, or 12 slots, and the winding (22) is wound on the stator slots, and the magnet (13) is 10 poles, 4 poles, 6 poles, 8 poles, 12 poles, 14 poles, or 16 poles; The outer rotor three-phase brushless DC motor further comprises a bearing (5); a mounting post (31) is provided on the bracket (3); a first mounting hole (311) and a second mounting hole (312) are provided on the mounting post (31), the first mounting holes (311) and the second mounting holes (312) being interconnected; the first mounting holes (311) are two and are located at two ends of the second mounting hole (312); the aperture of the second mounting hole (312) is smaller than the aperture of the first mounting hole (311); and the bearing (5) is located in the first mounting hole (311) or the second mounting hole (312).

2. The outer rotor three-phase brushless DC motor according to claim 1, characterized in that: A limiting block (313) is provided on the outer periphery of the mounting column (31), and a limiting groove (212) is provided on the inner wall of the stator frame (21), wherein the limiting groove (212) cooperates with the limiting block (313).

3. The outer rotor three-phase brushless DC motor according to claim 1, characterized in that: It also includes a drive control board (6), which is electrically connected to the stator assembly (2).

4. The outer rotor three-phase brushless DC motor according to claim 3, characterized in that: A plurality of supporting legs (32) are provided on the outer periphery of the bracket (3), and a fixing hole (321) is provided at one end of each supporting leg (32) away from the mounting column (31), and a shock-absorbing pad (7) is provided in the fixing hole (321).

5. The outer rotor three-phase brushless DC motor according to claim 4, characterized in that: The bracket (3) is provided with a mounting groove (33), one side of the bracket (3) is provided with a U-shaped groove (34), the U-shaped groove (34) is located on one side of the mounting groove (33), and the drive control board (6) is located in the mounting groove (33).

6. The outer rotor three-phase brushless DC motor according to claim 4, characterized in that: The bracket (3) is provided with a wire outlet hole (35), and the drive control board (6) and the stator assembly (2) are electrically connected via a wire, and the wire for connecting the drive control board (6) and the stator assembly (2) passes through the wire outlet hole (35).

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