Structure for improving dynamic balance of outer rotor motor

Abstract

The invention provides a structure for improving the dynamic balance of an outer rotor motor, and relates to the technical field of rotor motors, the structure comprises a rotating shaft and a rotor shell, and the rotating shaft is connected to the central axis of the rotor shell; a magnetic shoe rack is arranged in the rotor shell, a plurality of magnetic shoes are arranged on the inner wall of the magnetic shoe rack, and the plurality of magnetic shoes are annularly arranged around the rotating center line of the rotating shaft; the opening of the rotor housing is provided with a waterproof ring, and the magnetic shoe rack and / or the waterproof ring are / is provided with an annular plaster groove used for placing balance plaster. The structure for improving the dynamic balance of the outer rotor motor has the beneficial effects that the structure for improving the dynamic balance of the outer rotor motor is suitable for all outer rotor motors, the problem of heat dissipation of the motor is solved and the temperature rise of the motor is reduced through structural optimization, and meanwhile, passive dynamic balance correction of the single motor is realized through designing dynamic balance correction plaster grooves in the waterproof ring and the magnetic shoe frame, so that the reliability of the motor is improved. The dynamic balance precision of the rotor is improved, vibration and noise are reduced, and the reliability and the energy efficiency level of a whole machine product are improved.

Description

Technical Field

[0001] The invention relates to the technical field of rotor motors, and in particular to a structure for improving the dynamic balance of an outer rotor motor. Background Art

[0002] Compared with ordinary motors, outer rotor motors are widely used because of their high efficiency, low noise, light weight, and easy installation and maintenance. Especially in the field of fans, they have the advantage of compact structure. As we all know, electric motors need to be dynamically balanced to solve vibration and noise, but we can only see inner rotor motors being dynamically balanced. We don’t see outer rotor motors at present. That’s because the outer rotor motor structure is very difficult to achieve in design and process. In order to solve the vibration and noise problems of outer rotor motors, industry leaders have also taken great pains in the dynamic balancing technology of outer rotor motors. Therefore, it is imperative to conduct detailed research and technical breakthroughs on the removal and reduction of centrifugal force and centrifugal force couple of the outer rotor motor rotor in order to take the lead.

[0003] A study of rotor dynamics, which refers to the operation of determining the position and size of the imbalance (centrifugal force and centrifugal couple, see relative motion) generated when the rotor rotates and eliminating it. To remove and reduce the centrifugal force and centrifugal couple, it is necessary to strictly control the imbalance generated when the rotor moves.

[0004] The current situation is as follows:

[0005] 1. Because the rotor housing structure of the external rotor motor is composed of thin-walled cylinders, dynamic balancing cannot be achieved by either the deweighting method or the weighting method. The initial dynamic balancing amount of the rotor can reach more than 80g, which is far from the accuracy level required for the dynamic balancing of the motor;

[0006] 2. For example, in the fan industry, a balance sheet must be added to the fan wheel or blades for dynamic balancing. This not only reduces the reliability of the whole machine, but also increases the manufacturing process cost:

[0007] 3. Often at the application end, due to the large dynamic balance of the motor, the whole machine vibrates and makes a lot of noise, the bearing life is sharply reduced, and eventually the whole machine gets stuck and stops working.

[0008] Therefore, it is necessary to disclose a structure for improving the dynamic balance of an outer rotor motor to overcome the defects of the prior art. Summary of the invention

[0009] The present invention overcomes the shortcomings of the prior art and provides a structure for improving the dynamic balance of an outer rotor motor. By designing dynamic balancing mortar grooves on a waterproof ring and a magnetic tile frame, passive dynamic balancing of a single motor can be achieved, the dynamic balancing accuracy of the rotor can be improved, vibration and noise can be reduced, and the reliability and energy efficiency level of the entire product can be improved.

[0010] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0011] A structure for improving the dynamic balance of an outer rotor motor comprises a rotating shaft and a rotor housing, wherein the rotating shaft is connected to the central axis of the rotor housing; a magnetic tile frame is arranged in the rotor housing, and a plurality of magnetic tiles are arranged on the inner wall of the magnetic tile frame, wherein the plurality of magnetic tiles are arranged in a ring shape around the rotation center line of the rotating shaft; a waterproof ring is arranged at the opening of the rotor housing, and an annular clay groove for placing balancing clay is provided on the magnetic tile frame and / or the waterproof ring.

[0012] Furthermore, the annular mortar grooves are distributed in an annular shape and are equidistantly distributed on the magnetic tile frame and the waterproof ring.

[0013] Furthermore, the annular adhesive groove on the magnetic tile frame and the annular adhesive groove on the waterproof ring are located on a circle with the center of the rotating shaft as the center.

[0014] Furthermore, a shaft sleeve is arranged at the center of the rotor housing, and the rotating shaft is assembled on the shaft sleeve by interference fit.

[0015] Furthermore, a glue layer is provided between the rotor housing and the magnetic tile frame.

[0016] Furthermore, a wave spring sheet is arranged between adjacent magnetic tiles, and the undulating sides of the wave spring sheet are pressed against the adjacent magnetic tiles to enhance the clamping force between the magnetic tiles; the wave spring sheet extends along the axial direction of the rotating shaft.

[0017] Furthermore, the shaft sleeve is provided with a single coil of shaft steel wire.

[0018] Furthermore, the annular cement groove is arranged to extend into the axial depression of the rotating shaft.

[0019] Furthermore, the waterproof ring is provided with screws and hexagonal nuts.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This structure for improving the dynamic balance of outer rotor motors is suitable for all outer rotor motors. Through structural optimization, it solves the problem of motor heat dissipation and reduces the temperature rise of the motor. At the same time, this structure designs dynamic balancing mud grooves on the waterproof ring and the magnetic tile frame to achieve passive dynamic balancing of the single motor, improve the dynamic balancing accuracy of the rotor, achieve vibration reduction and noise reduction, and improve the reliability and energy efficiency level of the entire product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 is a top view of a structure for improving the dynamic balance of an outer rotor motor according to an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 The cross-sectional view in the AA direction;

[0025] Figure 3 is a three-dimensional diagram of a structure for improving the dynamic balance of an outer rotor motor according to an embodiment of the present invention;

[0026] Figure 4 is a three-dimensional diagram of a magnetic tile frame in an embodiment of the present invention;

[0027] Figure 5 It is a three-dimensional diagram of the waterproof ring in the embodiment of the present invention.

[0028] In the figure: 1. rotor housing; 2. bushing; 3. rotating shaft; 4. magnetic tile frame; 5. waterproof ring; 6. magnetic tile; 7. screw; 8. spring; 9. glue layer; 10. single turn of steel wire for shaft; 11. hexagonal nut; 12. balancing putty; 13. annular putty groove. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] like Figures 1 to 5 As shown, a structure for improving the dynamic balance of an outer rotor motor includes a rotating shaft 3 and a rotor housing 1. The rotating shaft 3 is connected to the central axis of the rotor housing 1, which is beneficial to maintaining the balance of the rotating shaft 3 and the rotor housing 1 when rotating together; a shaft sleeve 2 is provided at the center of the rotor housing 1, and the rotating shaft 3 is assembled to the shaft sleeve 2 by interference fit, so that the rotating shaft 3 is tightly installed on the shaft sleeve 2; the shaft sleeve 2 is provided with a single turn of shaft steel wire 10. Since a bearing will also be installed on the rotating shaft 3, the single turn of shaft steel wire 10 helps to prevent unnecessary movement of the bearing or other components in the axial direction.

[0031] A magnetic tile frame 4 is arranged inside the rotor housing 1, and a glue layer 9 is arranged between the rotor housing 1 and the magnetic tile frame 4, which helps to enhance the fixing effect between the rotor housing 1 and the magnetic tile frame 4; a plurality of magnetic tiles 6 are arranged on the inner wall of the magnetic tile frame 4, and the plurality of magnetic tiles 6 are arranged in a ring shape around the rotation center line of the rotating shaft 3; and combined with Figure 2 as well as Figure 3 It can be seen that a wave spring piece 8 is arranged between adjacent magnetic tiles 6, and the undulating sides of the wave spring piece 8 are pressed against the adjacent magnetic tiles 6 to enhance the clamping force between the magnetic tiles 6; the wave spring piece 8 extends along the axial direction of the rotating shaft 3; another purpose of using the wave spring piece 8 for pressing is to facilitate the insertion, assembly and disassembly of the wave spring piece 8. During the insertion process, the undulating sides of the wave spring piece 8 will be compressed and deformed, thereby having greater elastic potential energy to enhance the pressing force on the magnetic tiles 6 on both sides.

[0032] A waterproof ring 5 is provided at the opening of the rotor housing 1 to help enhance the sealing effect with the end cover; a screw 7 and a hexagonal nut 11 are provided on the waterproof ring 5 to help fix the connection with components such as the end cover or the dust cover.

[0033] An important design point of the present invention is that an annular mud groove 13 for placing balancing mud 12 is provided on the magnetic tile frame 4 and / or the waterproof ring 5; that is, as an outer rotor motor, according to actual needs, an annular mud groove 13 can be independently provided on the magnetic tile frame 4, an annular mud groove 13 can be independently provided on the waterproof ring 5, or an annular mud groove 13 can be provided on both the magnetic tile frame 4 and the waterproof ring 5; when the rotor is dynamically balanced by the weighting method, unequal amounts of mud weight can be added to the annular mud groove 13 to balance the rotor.

[0034] The annular glue grooves 13 are equidistantly distributed in an annular shape on the magnetic tile frame 4 and the waterproof ring 5, and the annular glue grooves 13 on the magnetic tile frame 4 and the annular glue grooves 13 on the waterproof ring 5 are located on a circle with the center of the rotating shaft 3 as the center. Therefore, when the rotor is dynamically balanced by the weighting method, unequal amounts of glue weight can be added at any angle of the magnetic tile frame 4 and the waterproof ring 5, so that both sides of the rotor can meet the design accuracy requirements.

[0035] from Figure 4 as well as Figure 5 It can be seen that the annular cement groove 13 is set to extend into the axial depression of the rotating shaft 3, which is helpful for embedding and fixing the cement. When the rotor rotates, it will not be separated by centrifugal force, and has good stability.

[0036] The structure for improving the dynamic balance of an outer rotor motor of the present invention is applicable to all outer rotor motors. Through structural optimization, the problem of heat dissipation of the motor is solved and the temperature rise of the motor is reduced. At the same time, this structure designs a dynamic balancing putty groove 13 on the waterproof ring 5 and the magnetic tile frame 4 to facilitate the placement of the dynamic balancing putty using the weighted method, thereby realizing passive dynamic balancing of a single motor, improving the dynamic balancing accuracy of the rotor, achieving vibration reduction and noise reduction, and improving the reliability and energy efficiency level of the entire product.

[0037] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, 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 structure for improving the dynamic balance of an outer rotor motor, characterized in that: The invention comprises a rotating shaft (3) and a rotor housing (1), wherein the rotating shaft (3) is connected to the central axis of the rotor housing (1); a magnetic tile frame (4) is arranged inside the rotor housing (1), a plurality of magnetic tiles (6) are arranged on the inner wall of the magnetic tile frame (4), and the plurality of magnetic tiles (6) are arranged in a ring shape around the rotation center line of the rotating shaft (3); a waterproof ring (5) is arranged at the opening of the rotor housing (1), and an annular clay groove (13) for placing balancing clay (12) is arranged on the magnetic tile frame (4) and / or the waterproof ring (5).

2. The structure for improving the dynamic balance of an outer rotor motor according to claim 1, characterized in that: The annular cement grooves (13) are distributed in an annular shape and at equal intervals on the magnetic tile frame (4) and the waterproof ring (5).

3. The structure for improving the dynamic balance of an outer rotor motor according to claim 2, characterized in that: The annular cement groove (13) on the magnetic tile frame (4) and the annular cement groove (13) on the waterproof ring (5) are located on a circle with the center of the rotating shaft (3) as the center.

4. The structure for improving the dynamic balance of an outer rotor motor according to claim 1, characterized in that: A shaft sleeve (2) is arranged at the center of the rotor housing (1), and the rotating shaft (3) is assembled on the shaft sleeve (2) by interference fit.

5. The structure for improving the dynamic balance of an outer rotor motor according to claim 1, characterized in that: A glue layer (9) is provided between the rotor housing (1) and the magnetic tile frame (4).

6. The structure for improving the dynamic balance of an outer rotor motor according to claim 1, characterized in that: A wave spring sheet (8) is arranged between adjacent magnetic tiles (6), and the undulating sides of the wave spring sheet (8) are pressed against adjacent magnetic tiles (6) to enhance the pressing force between the magnetic tiles (6); the wave spring sheet (8) extends along the axial direction of the rotating shaft (3).

7. The structure for improving the dynamic balance of an outer rotor motor according to claim 4, characterized in that: The shaft sleeve (2) is provided with a single coil (10) of shaft steel wire.

8. The structure for improving the dynamic balance of an outer rotor motor according to claim 1, characterized in that: The annular cement groove (13) is arranged to extend into the axial depression of the rotating shaft (3).

9. The structure for improving the dynamic balance of an outer rotor motor according to claim 1, characterized in that: The waterproof ring (5) is provided with screws (7) and hexagonal nuts (11).

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