Waterproof direct-current brushless motor structure applied to bathroom fan

Abstract

The utility model discloses a waterproof direct current brushless motor structure applied to a bathroom fan, and relates to the field of motor design. Comprising a motor base, a stator coil holder, a rotor end cover and an external controller, the stator coil holder is fixedly mounted on the motor base, the rotor end cover is mounted on the motor base in a running fit manner, and the outer side of the stator coil holder is coated with insulating paint; an electric wire is connected between the external controller and the stator coil holder, the external controller comprises a bottom shell, a top cover and a control panel, the top cover is fixedly mounted on the bottom shell, the control panel is fixedly mounted between the bottom shell and the top cover, the electric wire is electrically connected and mounted between the control panel and the stator coil holder, and liquid silica gel is filled between the bottom shell and the top cover; according to the utility model, the external controller is led out by using the electric wire, heat generated when the external controller works cannot be accumulated in the stator coil holder, the stator coil holder is insulated and sealed by using a painting mode, and the external controller is internally insulated and sealed by using a liquid silica gel filling mode, so that effective water prevention is realized.

Description

Technical Field

[0001] The utility model relates to the field of motor design, in particular to a waterproof DC brushless motor structure applied to a bathroom fan. Background Art

[0002] The DC brushless motor adopts variable frequency inverter technology. The controller generates a suitable rotating magnetic field according to the working state of the motor to drive the permanent magnet rotor to rotate. Early DC brushless motors basically had position sensors. Modern DC brushless motors generally adopt a sensorless method, and adjust the phase angle of the drive pulse by detecting the induced voltage of the stator coil. DC brushless motors are easy to achieve high-speed rotation and have a wide range of applications. High-power DC brushless motors generally adopt a three-phase structure.

[0003] The DC brushless motor needs to be used in cooperation with a motor controller. The controller of the DC brushless motor is generally integrally assembled with the motor. For example, in the prior art (publication number: CN110350751A, publication date: October 18, 2019), a DC brushless motor has a simple and compact structure and is easy to install; in the prior art (publication number: CN218217032U, publication date: January 3, 2023), a winch integrating a permanent magnet brushless motor and a controller is disclosed, and the controller is fixed at one end of the motor end cover close to the cylindrical permanent magnet; in the prior art (publication number: CN216982198U, publication date: July 15, 2022), a brushless motor microcontroller applicable to mains electricity is disclosed. The controller is divided into two independent power supply boards and drive boards, which can effectively reduce the size of the circuit board, independently adjust their respective circuit structures, independently assemble the power supply board and the drive board, reduce production costs, and form an integral structure with a high-voltage DC brushless motor; in the prior art (publication number: CN212115111U, publication date: December 8, 2020), a brushless outer rotor motor with an integrated bearing seat and mounting plate is disclosed. Its structure is optimized from a split structure of the bearing seat and the mounting plate to an integrated aluminum alloy die casting, reducing the parts at the connection part of the two, which is beneficial to improving the concentricity and strength of the overall parts, and hollowing out the internal structure to reduce the material weight.

[0004] In the above-mentioned multiple prior arts and current common DC brushless motors, the circuit board is generally directly built into the stator wire frame of the motor. This installation method makes it difficult for the brushless motor to be waterproof. When applied to an environment with high humidity, the circuit board and the stator wire frame inside the motor are prone to damage. Therefore, the existing DC brushless motors cannot be directly applied to bathroom fans, and the waterproof performance of DC brushless motors still needs to be improved. At the same time, in the existing DC brushless motors, since the circuit board is directly built into the motor, after long-term operation, the heat on the circuit board is difficult to dissipate, resulting in a risk of overheating and damage to the motor. Summary of the Utility Model

[0005] The present utility model overcomes the above - mentioned deficiencies and provides a technical solution that can solve the above - mentioned problems.

[0006] A waterproof DC brushless motor structure applied to a bathroom fan; it includes a motor base, a stator wire frame, a rotor end cover, and an external controller; the stator wire frame is fixedly installed on the motor base, the rotor end cover is rotatably and fittingly installed on the motor base, the rotor end cover covers the stator wire frame, and an insulating paint is coated on the outer side of the stator wire frame; a wire is connected between the external controller and the stator wire frame. The external controller includes a bottom shell, a top cover, and a control board. The top cover is fixedly installed on the bottom shell, the control board is fixedly installed between the bottom shell and the top cover, the wire is electrically connected and installed between the control board and the stator wire frame, and liquid silicone is filled and poured between the bottom shell and the top cover.

[0007] Further: A positioning cylinder is formed in the middle of the motor base, a crimping hole is formed in the middle of the stator wire frame, and the stator wire frame is tightly and fittingly installed on the outer side of the positioning cylinder through the crimping hole.

[0008] Further: At least three positioning edges are formed on the outer side of the positioning cylinder, and the at least three positioning edges are circularly arranged with each other. At least three limiting grooves are formed in the crimping hole, and the positioning edges are inserted into the limiting grooves in a one - to - one corresponding and clearance - fitting manner.

[0009] Further: An insertion bevel is formed on the outer side of the upper end of the positioning edge, and the positioning edge is inserted into the limiting groove through the crimping bevel.

[0010] Further: A rotating shaft is fixedly installed in the middle of the rotor end cover, and the inner end of the rotating shaft is rotatably and fittingly installed in the positioning cylinder.

[0011] Further: At least two rolling bearings are sleeved on the rotating shaft, and the outer wall of the rolling bearing is tightly and fittingly installed in the positioning cylinder.

[0012] Further: A permanent magnet ring is fixedly installed on the inner wall of the rotor end cover, and the stator wire frame is arranged in the permanent magnet ring with a clearance fit.

[0013] Further: Conductive copper wires are wound and installed on the stator wire frame, and the conductive copper wires are electrically connected to the control board through the wire, and the insulating paint is coated on the outer sides of the stator wire frame and the conductive copper wires.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. By using the method of leading out wires, a solution of separating the stator wire frame and the external controller is realized. The stator wire frame is insulated and sealed by dipping paint, effectively achieving waterproofing and being applicable to the humid environment of the bathroom.

[0016] 2. The external controller realizes insulation and sealing by filling with liquid silicone inside. After the liquid silicone dries, a stable sealing structure can be formed on the outside of the control board to achieve effective waterproofing and is applicable to the humid environment of the bathroom.

[0017] 3. Different from traditional brushless DC motors, the external controller does not need to be built into the motor, which can effectively improve the heat dissipation performance of the motor, prevent the motor from overheating and damage easily, and enable long-term operation.

[0018] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of the present utility model;

[0021] Figure 2 is Figure 1 the exploded structural diagram of

[0022] Figure 3 is a schematic structural diagram of another perspective of the present utility model;

[0023] Figure 4 is Figure 3 the exploded structural diagram of

[0024] As shown in the figure: 1. Motor base; 2. Stator wire frame; 3. Rotor end cover; 4. External controller; 4.1. Bottom shell; 4.2. Top cover; 4.3. Control board; 5. Electric wire; 6. Positioning cylinder; 7. Crimping hole; 8. Positioning edge; 9. Limiting groove; 10. Insertion chamfer; 11. Rotating shaft; 12. Rolling bearing; 13. Permanent magnet ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them.

[0026] The components of the embodiments of the present utility model that are usually described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model.

[0027] Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] As Figures 1-4 shown, a waterproof DC brushless motor structure for a bathroom fan of the present utility model; includes a motor base 1, a stator wire frame 2, a rotor end cover 3, and an external controller 4; the stator wire frame 2 is fixedly installed on the motor base 1, the rotor end cover 3 is rotatably and fittingly installed on the motor base 1, the rotor end cover 3 covers the stator wire frame 2, and an insulating paint is coated on the outside of the stator wire frame 2; a wire 5 is connected between the external controller 4 and the stator wire frame 2, the external controller 4 includes a bottom case 4.1, a top cover 4.2, and a control board 4.3, the top cover 4.2 is fixedly installed on the bottom case 4.1, the control board 4.3 is fixedly installed between the bottom case 4.1 and the top cover 4.2, the wire 5 is electrically connected and installed between the control board 4.3 and the stator wire frame 2, and liquid silicone is filled and poured between the bottom case 4.1 and the top cover 4.2;

[0031] The principle is as follows: By using the way of leading out the wire 5, a solution of separately arranging the stator wire frame 2 and the external controller 4 is realized. The stator wire frame 2 is coated with insulating paint by dipping, achieving the effect of insulating and sealing, and can be applicable to the humid environment of the bathroom; the internal of the external controller 4 is insulated and sealed by filling with liquid silicone, and after the liquid silicone dries, a stable sealing structure can be formed on the outer side of the control board 4.3, realizing effective waterproofing and being applicable to the humid environment of the bathroom; at the same time, the external controller 4 no longer needs to be built into the motor like a traditional DC brushless motor, which can effectively improve the heat dissipation performance of the motor, making the motor not easily overheat and damage, and enabling long-term operation.

[0032] Furthermore: A positioning cylinder 6 is formed in the middle of the motor base 1, and a crimping hole 7 is formed in the middle of the stator wire frame 2. The stator wire frame 2 is tightly fitted and installed on the outer side of the positioning cylinder 6 through the crimping hole 7; tight-fitting crimping assembly can be realized to ensure the stable installation of the stator wire frame 2 on the motor base 1.

[0033] Furthermore: At least three positioning edges 8 are formed on the outer side of the positioning cylinder 6, and at least three positioning edges 8 are circularly arrayed with each other. At least three limiting grooves 9 are formed in the crimping hole 7, and the positioning edges 8 are inserted into the limiting grooves 9 in a one-to-one corresponding clearance fit; it can prevent the stator wire frame 2 from rotating relative to the positioning cylinder 6.

[0034] Furthermore: An insertion bevel 10 is formed on the outer side of the upper end of the positioning edge 8, and the positioning edge 8 is inserted into the limiting groove 9 through the crimping bevel; it can improve the assembly efficiency of the stator wire frame 2 on the motor base 1.

[0035] Furthermore: A rotating shaft 11 is fixedly installed in the middle of the rotor end cover 3, and the inner end of the rotating shaft 11 is rotatably fitted and installed in the positioning cylinder 6; this makes the rotational fit of the rotor end cover 3 on the motor base 1 more stable.

[0036] Furthermore: At least two rolling bearings 12 are sleeved and installed on the rotating shaft 11, and the outer wall of the rolling bearing 12 is tightly fitted and installed in the positioning cylinder 6; this makes the rotational fit of the rotating shaft 11 in the positioning cylinder 6 more stable.

[0037] Furthermore: A permanent magnet ring 13 is fixedly installed on the inner wall of the rotor end cover 3, and the stator wire frame 2 is arranged in the permanent magnet ring 13 with a clearance fit; conductive copper wires are wound and installed on the stator wire frame 2, and the conductive current is electrically connected to the control board 4.3 through the wire 5, and insulating paint is coated on the outer sides of the stator wire frame 2 and the conductive copper wires; after the conductive copper wires on the stator wire frame 2 are energized, a dynamic magnetic field will be formed with the permanent magnet ring 13, thereby realizing the high-speed rotation of the rotor end cover 3.

[0038] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present utility model. Any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the technical solution of the present utility model.

Claims

1. A waterproof brushless DC motor structure for bathroom fans; characterized in that: It includes motor base, stator bobbin, rotor end cover and external controller; The stator wire frame is fixedly mounted on the motor base, the rotor end cover is rotatably mounted on the motor base, the rotor end cover covers the stator wire frame, and the outer side of the stator wire frame is coated with insulating paint; Wires are connected between the external controller and the stator wire frame. The external controller includes a bottom shell, a top cover and a control board. The top cover is fixedly installed on the bottom shell, the control board is fixedly installed between the bottom shell and the top cover, the wires are electrically connected and installed between the control board and the stator wire frame, and liquid silicone is poured and filled between the bottom shell and the top cover.

2. A waterproof brushless DC motor structure for bathroom fans according to claim 1, characterized in that: A positioning cylinder is formed in the middle of the motor base, a crimping hole is formed in the middle of the stator wire frame, and the stator wire frame is tightly mounted on the outer side of the positioning cylinder through the crimping hole.

3. The waterproof brushless DC motor structure for bathroom fan according to claim 2 is characterized in that: At least three positioning edges are formed on the outer side of the positioning cylinder, and the at least three positioning edges are arranged in a circular array with each other. At least three limiting grooves are formed in the crimping hole, and the positioning edges are inserted into the limiting grooves with one-to-one clearance fit.

4. The waterproof brushless DC motor structure for bathroom fan according to claim 3 is characterized in that: An inserting bevel is formed on the outer side of the upper end of the positioning edge, and the positioning edge is inserted into the limiting groove through the crimping bevel.

5. The waterproof brushless DC motor structure for bathroom fan according to claim 2, characterized in that: A rotating shaft is fixedly mounted in the middle of the rotor end cover, and the inner end of the rotating shaft is rotatably mounted in the positioning cylinder.

6. The waterproof brushless DC motor structure for bathroom fan according to claim 5, characterized in that: At least two rolling bearings are sleeved and installed on the rotating shaft, and the outer walls of the rolling bearings are tightly fitted in the positioning cylinder.

7. The waterproof brushless DC motor structure for bathroom fan according to claim 1, characterized in that: A permanent magnet ring is fixedly mounted on the inner wall of the rotor end cover, and the stator wire frame is arranged in the permanent magnet ring with a clearance fit.

8. The waterproof brushless DC motor structure for bathroom fan according to claim 7, characterized in that: Conductive copper wires are wound and installed on the stator wire frame, and the conductive copper wires are electrically connected to the control board through electric wires. Insulating paint is coated on the outer sides of the stator wire frame and the conductive copper wires.

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