Sound wave motor and electric toothbrush

Abstract

The utility model provides a sound wave motor, which comprises a stator shell, an end cover assembly, a rotor assembly and a stator iron core, the stator iron core comprises a winding side and two connecting sides, the two connecting sides are symmetrically arranged, the two sides of the winding side are respectively connected with the two connecting sides, the other sides of the connecting sides are connected with the stator shell, a wire group is wound on the winding side, and the end cover assembly is connected with the rotor assembly. The first containing space is defined by the connecting side and the winding side, and due to the fact that only one side needs to be wound in the winding process, the working procedure is simplified, and the assembling efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of electric equipment technology, and in particular to a sonic motor and an electric toothbrush. Background Technology

[0002] Electric toothbrushes are primarily driven by an electric motor, which generates vibration or rotational motion to help clean teeth. Traditional electric motors have rotor windings positioned between two pairs of magnets. The alternating magnetic field generated when the winding coils are energized and the alternating attraction between the two pairs of permanent magnets cause the center of magnetic flux in the rotor windings to oscillate back and forth between the centers of flux of the two pairs of magnets. Because two symmetrically arranged winding coils are required, the rotor winding process is cumbersome, requiring winding one side completely before winding the other, resulting in low assembly efficiency. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a sound wave motor, which aims to solve the problem in the prior art that, due to the need for two symmetrically arranged winding coils, the rotor winding needs to be wound on one side before winding on the other side, resulting in a complicated process and low efficiency.

[0004] This utility model provides an acoustic motor, including a stator housing, an end cover assembly, a rotor assembly, and a stator core. The stator core includes a winding side and two connecting sides, which are symmetrically arranged. The two sides of the winding side are respectively connected to the two connecting sides, and the other side of the connecting side is connected to the stator housing. A wire group is wound on the winding side. The connecting side and the winding side form a first accommodating space, which is used to accommodate the magnetic part of the rotor assembly. The end cover assembly is disposed on the end of the stator housing, and the rotor assembly is rotatably connected to the end cover assembly. The wire group is used to generate an alternating magnetic field by energizing it, so that the rotor assembly swings back and forth.

[0005] Furthermore, the stator housing includes a fixed side and a connecting rod. There are two fixed sides, which are symmetrically arranged. The connecting rod connects the two fixed sides, and the two fixed sides enclose a second accommodating space. The second accommodating space is used to accommodate the stator core, and the connecting side is fixed to the fixed side.

[0006] Furthermore, there are two connecting rods, with a gap between the two connecting rods and a gap between the two fixed sides.

[0007] Furthermore, both ends of the stator housing are provided with protruding positioning posts, and the end cover assembly includes a front end cover and a rear end cover, both of which are recessed with positioning holes corresponding to the positioning posts.

[0008] Furthermore, the rotor assembly includes a rotor core, a rotating shaft, and a permanent magnet. The rotor core is fixed on the rotating shaft, and the permanent magnet is embedded in the stator core. Bearings are provided on both the front end cover and the rear end cover, and the rotating shaft is rotatably connected to the front end cover and the rear end cover through the bearings.

[0009] Furthermore, the stator core is provided with an inlay groove for inlaying the permanent magnet.

[0010] Furthermore, the permanent magnets are provided in a plurality of groups, and the plurality of permanent magnets are divided into two groups, the two groups of permanent magnets being symmetrically arranged on the rotor core.

[0011] Furthermore, the end of the rotating shaft is cut with two symmetrical cut surfaces along its axial direction. The rear end cover is provided with a limiting hole corresponding to the cut surfaces. A gap is maintained between the limiting hole and the end of the rotating shaft. The limiting hole is used to limit the rotation angle of the rotating shaft.

[0012] Furthermore, the rear end cover has a through hole through which a lead wire can pass, and the lead wire is used to conduct electricity to the wire group.

[0013] This utility model also provides an electric toothbrush, including the sonic motor described in any of the above claims.

[0014] Beneficial effects: This utility model provides an acoustic motor, including a stator housing, an end cover assembly, a rotor assembly, and a stator core. The stator core includes a winding side and two connecting sides, which are symmetrically arranged. The two sides of the winding side are respectively connected to the two connecting sides, and the other side of the connecting side is connected to the stator housing. A wire group is wound on the winding side. The connecting side and the winding side form a first accommodating space. Since only one side needs to be wound during winding, the process is simplified and the assembly efficiency is improved. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the acoustic motor of this utility model;

[0016] Figure 2 This is an exploded view of the structure of the acoustic motor of this utility model;

[0017] Figure 3 This is a cross-sectional view of the acoustic motor of this utility model;

[0018] Figure 4 This is a schematic diagram of the stator core structure;

[0019] Figure 5 This is a schematic diagram of the stator shell structure;

[0020] Figure 6 This is a schematic diagram of the rotor core structure;

[0021] Figure 7 This is an exploded view of the shaft and the rear end cover.

[0022] In the diagram: 1. Stator housing; 11. Fixed side; 12. Connecting rod; 13. Second receiving space; 14. Positioning post; 2. End cover assembly; 21. Front end cover; 22. Rear end cover; 221. Limiting hole; 222. Through hole; 23. Positioning hole; 24. Bearing; 25. Lead wire; 3. Rotor assembly; 31. Rotor core; 32. Shaft; 321. Cross-section; 33. Permanent magnet; 4. Stator core; 41. Winding side; 42. Connecting side; 43. First receiving space; 44. Inlay groove; 45. Wire group. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figures 1 to 7 This utility model provides an acoustic motor, including a stator housing 1, an end cover assembly 2, a rotor assembly 3, and a stator core 4. The stator core 4 includes a winding side 41 and two connecting sides 42, which are symmetrically arranged. The two sides of the winding side 41 are respectively connected to the two connecting sides 42, and the other side of the connecting side 42 is connected to the stator housing 1. A wire group 45 is wound on the winding side 41. The connecting side 42 and the winding side 41 form a first accommodating space 43, which is used to accommodate the magnetic part of the rotor assembly 3. The end cover assembly 2 is disposed on the end of the stator housing 1, and the rotor assembly 3 is rotatably connected to the end cover assembly 2. The wire group 45 is used to generate an alternating magnetic field when energized to make the rotor assembly 3 swing back and forth.

[0025] Specifically, the winding side 41 of the stator core 4 is wound with a wire group (such as a copper coil). When winding, it can be completed in one direction (any direction). The process is simple and the assembly is convenient.

[0026] After the conductor group 45 is energized, since the conductors are all in the same direction, according to Ampere's law and the right-hand screw law, one end of the stator core 4 generates the N pole, and the other end generates the S pole. Based on the principle that like poles repel and unlike poles attract, the rotor assembly 3 will rotate at an angle. When the current direction changes, the magnetism induced on the rotor assembly 3 will also change, causing the rotor assembly 3 to rotate at an angle in the opposite direction. This cycle repeats itself, with the current direction changing periodically, causing the rotor assembly 3 to oscillate back and forth, thus causing the motor to vibrate.

[0027] Furthermore, the stator housing 1 is not entirely circular, but is made straight (with a smaller distance) on the side with the same polarity, which restricts the rotor assembly 3 from rotating in a circle inside. Therefore, the rotor assembly 3 can only vibrate back and forth, and will not rotate in a circle like a general motor.

[0028] In one feasible embodiment, the stator housing 1 includes a fixed side 11 and a connecting rod 12. Two fixed sides 11 are provided, symmetrically arranged. The connecting rod 12 connects the two fixed sides 11, forming a second accommodating space 13 between them. The second accommodating space 13 is used to accommodate the stator core 4. The connecting side 42 is fixed to the fixed side 11. In this embodiment, the fixed side 11 and the connecting rod 12 are made of plastic, serving functions such as insulation and protection. The stator core 4 is made of silicon steel sheets and is an important component of the magnetic circuit. The winding is made of copper wire, which generates an alternating magnetic field after a high-frequency square wave is introduced.

[0029] Furthermore, since there are two connecting rods 12, with a gap between them and a gap between the two fixed sides 11, the stator housing 1 has a simple structure, saving raw materials required for production. In addition, the winding status of the winding coil and the operating status of the rotor assembly 3 can be observed through the aforementioned gaps.

[0030] In one feasible embodiment, both ends of the stator housing 1 are provided with protruding positioning posts 14, and the end cover assembly 2 includes a front cover 21 and a rear cover 22. Both the front cover 21 and the rear cover 22 are recessed with positioning holes 23 corresponding to the positioning posts 14. The cooperation between the positioning posts 14 and the positioning holes 23 prevents the end covers from shifting during assembly. The front cover 21 and the rear cover 22 not only protect the components inside the stator housing 1 from the influence of the external environment, but also provide necessary support and connection for the normal operation of the rotor assembly 3. The front cover 21 and the rear cover 22 are fixed to the stator housing 1 with screws. The front cover 21 and the rear cover 22 can be made of plastic. The stator core 4 can also adopt an arc design, which better fits the rotational movement of the rotor assembly 3, resulting in higher space utilization, stronger magnetic properties, and enhanced performance.

[0031] In one feasible embodiment, the rotor assembly 3 includes a rotor core 31, a shaft 32, and a permanent magnet 33. The rotor core 31 is fixed to the shaft 32, and the permanent magnet is embedded in the stator core 4. Bearings 24 are provided on both the front end cover 21 and the rear end cover 22. The shaft 32 is rotatably connected to the front end cover 21 and the rear end cover 22 via the bearings 24. Specifically, the stator core 4 has an inlay groove 44 for embedding the permanent magnet 33. The bearing 24 in this embodiment can be flexibly changed; it can be a ball bearing 24 or an oil-impregnated bearing 24. The cost of a ball bearing 24 is higher than that of an oil-impregnated bearing 24. Therefore, there are three options for selecting the bearing 24: double ball bearings 24, one ball bearing 24 and one oil-impregnated bearing 24, and double oil-impregnated bearings 24.

[0032] In one feasible embodiment, a plurality of permanent magnets are provided, and the plurality of permanent magnets are divided into two groups, with the two groups of permanent magnets symmetrically disposed on the rotor core 31. Taking four permanent magnets as an example, each group consists of two permanent magnets 33. The same end of a group of permanent magnets located on the same side is of opposite polarity, while the two symmetrical permanent magnets 33 are of the same polarity. Furthermore, the surface of the permanent magnets is arc-shaped, which improves space utilization. Compared to a square structure, the arc-shaped permanent magnets have a larger cross-sectional area, stronger magnetic properties, optimized magnetic field distribution, and improved motor performance.

[0033] In one feasible embodiment, the end of the rotating shaft 32 is cut with two axial facets 321, which are symmetrically arranged. The rear end cover 22 has a limiting hole 221 corresponding to the facets 321. A gap is maintained between the limiting hole 221 and the end of the rotating shaft 32. The limiting hole 221 is used to limit the rotation angle of the rotating shaft 32. In this embodiment, the cooperation between the limiting hole 221 and the end of the rotating shaft 32 can limit the rotor from rotating at excessively large angles. By adjusting the dimensions of the limiting hole 221 and the end of the rotating shaft 32, the rotation angle of the rotor core 31 can be controlled.

[0034] In one feasible implementation, the rear cover 22 has a through hole 222 through which a lead wire 25 can pass, the lead wire 25 being used to conduct electricity to the wire group.

[0035] This utility model also provides an electric toothbrush, including the sonic motor described in any of the above claims.

[0036] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A sound wave motor, characterized in that: The stator includes a stator housing (1), an end cap assembly (2), a rotor assembly (3), and a stator core (4). The stator core (4) includes a winding side (41) and two connecting sides (42). The two connecting sides (42) are symmetrically arranged. The two sides of the winding side (41) are respectively connected to the two connecting sides (42). The other side of the connecting side (42) is connected to the stator housing (1). A wire group (45) is wound on the winding side (41). The connecting side (42) and the winding side (41) form a first accommodating space (43). The first accommodating space (43) is used to accommodate the magnetic part of the rotor assembly (3). The end cap assembly (2) is located on the end of the stator housing (1). The rotor assembly (3) is rotatably connected to the end cap assembly (2). The wire group (45) is used to generate an alternating magnetic field so that the rotor assembly (3) swings back and forth.

2. The acoustic motor according to claim 1, characterized in that: The stator housing (1) includes a fixed side (11) and a connecting rod (12). There are two fixed sides (11) arranged symmetrically. The connecting rod (12) connects the two fixed sides (11) and the two fixed sides (11) form a second accommodating space (13). The second accommodating space (13) is used to accommodate the stator core (4). The connecting side (42) is fixed to the fixed side (11).

3. The acoustic motor according to claim 2, characterized in that: There are two connecting rods (12), with a gap between the two connecting rods (12) and a gap between the two fixed sides (11).

4. The acoustic motor according to claim 1, characterized in that: The stator housing (1) has positioning posts (14) protruding at both ends. The end cover assembly (2) includes a front cover (21) and a rear cover (22). Both the front cover (21) and the rear cover (22) have positioning holes (23) corresponding to the positioning posts (14).

5. The acoustic motor according to claim 4, characterized in that: The rotor assembly (3) includes a rotor core (31), a rotating shaft (32), and a permanent magnet (33). The rotor core (31) is fixed on the rotating shaft (32), and the permanent magnet (33) is embedded on the stator core (4). The front end cover (21) and the rear end cover (22) are both provided with bearings (24). The rotating shaft (32) is rotatably connected to the front end cover (21) and the rear end cover (22) through the bearings (24).

6. The acoustic motor according to claim 5, characterized in that: The stator core (4) is provided with an inlay groove (44) for inlaying the permanent magnet (33).

7. The acoustic motor according to claim 5, characterized in that: The permanent magnets are provided in a plurality of groups, and the plurality of permanent magnets are divided into two groups, and the two groups of permanent magnets are symmetrically arranged on the rotor core (31).

8. The acoustic motor according to claim 5, characterized in that: The end of the shaft (32) has two cut surfaces (321) cut along its axial direction. The two cut surfaces (321) are symmetrically arranged. The rear end cover (22) has a limiting hole (221) corresponding to the cut surface (321). A gap is maintained between the limiting hole (221) and the end of the shaft (32). The limiting hole (221) is used to limit the angle of rotation of the shaft (32).

9. The acoustic motor according to claim 4, characterized in that: The rear end cover (22) has a through hole (222) through which the lead wire (25) can pass through, and the lead wire (25) is used to conduct electricity to the wire group (45).

10. An electric toothbrush, characterized in that, Includes the acoustic motor according to any one of claims 1-9.

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