A sonic motor and its implementation method

Abstract

The present invention discloses a sonic motor, comprising a housing, a tailstock disposed at one end of the housing, an output shaft disposed at the other end of the housing, a rotor assembly disposed within the housing, the rotor assembly comprising a core shaft, an iron core disposed around the circumference of the core shaft, the iron core comprising four symmetrical winding posts, each of which is wound with a coil, a spring assembly disposed at one end of the core shaft located at the tailstock, the other end of the core shaft connected to the output shaft, and two mutually symmetrical magnetic tiles disposed on the inner wall of the housing. The present invention also discloses a method for implementing a sonic motor. The iron core of the present invention can be wound with four coils, which, when energized, act as four magnetic tiles, interacting with the two symmetrical magnetic tiles on the inner wall of the housing to provide driving force for the motor. Compared with the prior art method of providing four magnetic tiles, only two magnetic tiles are used while ensuring that the vibration sense remains unchanged, thereby greatly reducing production costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of sonic wave motors, and in particular relates to a sonic wave motor and an implementation method thereof. Background Art

[0002] At present, there are two main designs of sonic motors used in electric toothbrushes on the market. One design is that the coil is on the rotor and the magnetic tile is on the stator, such as Figure 7 As shown; the other is that the magnetic tiles are on the rotor and the coils are on the stator.

[0003] The common features of the two designs are that the magnetic tiles are composed of four pieces, two coils are wound around the iron core, and two rolling bearings are required. For ultrasonic motors, the magnetic tiles and bearings are the two most expensive components, and the use of two bearings is also prone to noise caused by vibration.

[0004] Therefore, the sonic motor in the prior art not only has the problem of complex structure, but also has the problems of high production cost and poor customer experience. Summary of the Invention

[0005] The present invention aims to provide a sonic motor that solves the problems mentioned in the above background art. The sonic motor provided by the present invention simplifies the design of the sonic motor while ensuring the vibration feeling, reduces the production cost and also reduces the noise.

[0006] Another object of the present invention is to provide a method for realizing a sonic motor.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a sonic motor, comprising a shell, a tailstock being provided at one end of the shell, an output shaft being provided at the other end of the shell, a rotor assembly being provided inside the shell, the rotor assembly comprising a core shaft, an iron core being provided on the circumference of the core shaft, the iron core comprising four mutually symmetrical winding posts, coils being wound on each of the four winding posts, a spring assembly being provided on one end of the core shaft located at the tailstock, the other end of the core shaft being connected to the output shaft, and two mutually symmetrical magnetic tiles being provided on the inner wall of the shell.

[0008] In order to facilitate the winding of the coil, the winding post is further in a T-shaped structure.

[0009] In order to enable the output shaft to rotate relative to the housing, the output shaft is further connected to the housing via a rolling bearing.

[0010] In order to limit the core shaft, a sleeve is further provided on one end of the core shaft close to the output shaft.

[0011] In order to both support the mandrel and ensure that the mandrel can reciprocate at a small angle within the rubber sleeve, thereby eliminating the need for bearings in the tailstock, effectively reducing production costs and reducing noise during motor operation, the tailstock is further provided with an assembly groove, the assembly groove is provided with a rubber sleeve, and the end of the mandrel is embedded in the rubber sleeve. The outer diameter of the mandrel is equal to the inner diameter of the rubber sleeve.

[0012] In order to exhaust air when the rubber sleeve is inserted into the assembly groove so that the rubber sleeve can be inserted conveniently, a plurality of exhaust grooves are further provided on the inner wall of the assembly groove.

[0013] In order to position the rubber sleeve and prevent the rubber sleeve from rotating relative to the tailstock, a positioning protrusion corresponding to the exhaust groove is further provided on the circumference of the rubber sleeve.

[0014] In order to position the rubber sleeve without affecting the insertion of the rubber sleeve into the assembly groove, the width of the positioning protrusion is equal to the width of the exhaust groove, and the height of the positioning protrusion is less than the depth of the exhaust groove.

[0015] Furthermore, in the present invention, the method for realizing a sonic motor comprises the following steps:

[0016] (1) Two magnetic tiles are symmetrically arranged on the inner wall of the housing to provide a driving magnetic field for the motor;

[0017] (2) The coils wound on the four winding poles form an electric field when energized;

[0018] (3) The spring assembly is used to connect to the power supply and provide elastic force for the reciprocating rotation of the rotor assembly;

[0019] (4) The rubber sleeve is used to support the reciprocating rotation of the core shaft.

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

[0021] 1. The iron core of the present invention includes four mutually symmetrical winding poles, which can be wound with four coils. When energized, the coils act as four magnetic tiles, which interact with two symmetrical magnetic tiles on the inner wall of the housing to provide driving force for the motor. Compared with the existing technology that uses four magnetic tiles, only two magnetic tiles are used while ensuring the same vibration sense, thereby greatly reducing production costs.

[0022] 2. Since the present invention uses only two symmetrically arranged magnetic tiles, there is no influence of the magnetic tiles on the same side during assembly, so there is no need to use a plastic frame to position the magnetic tiles, thereby further reducing production costs;

[0023] 3. The present invention replaces the bearing in the tailstock in the prior art with a rubber sleeve. Since rubber has a certain elasticity and hardness, it can not only support the core shaft, but also ensure that the core shaft can reciprocate at a small angle in the rubber sleeve, effectively reducing production costs and reducing the noise when the motor is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the explosion of the structure of the present invention;

[0025] Figure 2 Schematic diagram of the structure of the rotor assembly of the present invention;

[0026] Figure 3 It is a schematic cross-sectional view of the present invention;

[0027] Figure 4 Schematic diagram of the structure of the iron core of the present invention;

[0028] Figure 5 Schematic diagram of the structure of the tailstock of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the rubber sleeve of the present invention;

[0030] Figure 7 It is a structural diagram of a sonic motor in the prior art.

[0031] In the figure: 1. Rolling bearing; 2. Housing; 3. Magnetic tile; 4. Output shaft; 5. Rotor assembly; 51. Mandrel; 52. Iron core; 521. Winding post; 53. Spring assembly; 54. Coil; 55. Sleeve; 6. Rubber sleeve; 61. Positioning protrusion; 7. Tail stock; 71. Assembly groove; 72. Exhaust groove; 8. Plastic frame. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1

[0034] See also Figure 1-6The present invention provides the following technical solutions: a sonic motor, comprising a shell 2, a tailstock 7 being provided at one end of the shell 2, an output shaft 4 being provided at the other end of the shell 2, a rotor assembly 5 being provided inside the shell 2, the rotor assembly 5 comprising a core shaft 51, an iron core 52 being sleeved on the circumference of the core shaft 51, the iron core 52 comprising four mutually symmetrical winding posts 521, each of the four winding posts 521 being wound with a coil 54, a spring assembly 53 being provided at one end of the core shaft 51 located at the tailstock 7, the spring assembly 53 comprising a fixed seat and two spring pieces, wherein the fixed seat is assembled on the core shaft 51, the two spring pieces are symmetrically injection-molded in the fixed seat, the exposed end of the spring piece is also welded to the wire end of the coil 54, the other end of the spring piece passes through the tailstock 7 and is bonded to the tailstock 7 by glue for connecting to a power source, the other end of the core shaft 51 is connected to the output shaft 4, two mutually symmetrical magnetic tiles 3 are provided on the inner wall of the shell 2, the N pole of one magnetic tile 3 is arranged opposite to the S pole of the other magnetic tile 3

[0035] By adopting the above technical solution, the iron core 52 includes four mutually symmetrical winding poles 521, which can be wound with four coils 54. When the coils 54 are energized, they are equivalent to four magnetic tiles, which interact with the two symmetrical magnetic tiles 3 on the inner wall of the shell 2 to provide driving force for the motor. Compared with the four magnetic tiles set in the prior art, only two magnetic tiles 3 are used while ensuring that the vibration sense remains unchanged, thereby greatly reducing the production cost; at the same time, because only two symmetrically arranged magnetic tiles 3 are used, when the magnetic tiles 3 are assembled, there is no influence of the magnetic tiles on the same side, so there is no need to use a plastic frame to position the magnetic tiles, thereby further reducing the production cost.

[0036] Specifically, the winding post 521 is a T-shaped structure.

[0037] By adopting the above technical solution, the winding of the coil 54 is facilitated.

[0038] Specifically, the output shaft 4 is connected to the housing 2 via a rolling bearing 1 .

[0039] By adopting the above technical solution, the output shaft 4 can rotate relative to the housing 2.

[0040] Specifically, a sleeve 55 is provided on one end of the core shaft 51 close to the output shaft 4 .

[0041] By adopting the above technical solution, the core shaft 51 is limited.

[0042] Example 2

[0043] The difference between this embodiment and Example 1 is that: specifically, an assembly groove 71 is provided inside the tailstock 7, a rubber sleeve 6 is provided inside the assembly groove 71, the rubber sleeve 6 and the assembly groove 71 are bonded to each other by glue, the end of the core shaft 51 is embedded in the inside of the rubber sleeve 6, and the outer diameter of the core shaft 51 is equal to the inner diameter of the rubber sleeve 6.

[0044] By adopting the above technical solution, since rubber has a certain elasticity and hardness, it can not only support the core shaft 51, but also ensure that the core shaft 51 can reciprocate at a small angle in the rubber sleeve 6, thereby eliminating the use of bearings at the tailstock 7, effectively reducing production costs, and reducing the noise when the motor is working.

[0045] Specifically, a plurality of exhaust grooves 72 are provided on the inner wall of the assembly groove 71 .

[0046] By adopting the above technical solution, when the rubber sleeve 6 is installed in the assembly groove 71, the air is exhausted through the exhaust groove 72, so that the rubber sleeve 6 can be easily installed.

[0047] Example 3

[0048] The difference between this embodiment and the second embodiment is that, specifically, a positioning protrusion 61 corresponding to the exhaust groove 72 is provided on the circumference of the rubber sleeve 6 .

[0049] By adopting the above technical solution, the rubber sleeve 6 is positioned by the positioning protrusion 61 , and at the same time, the rubber sleeve 6 can be prevented from rotating relative to the tailstock 7 .

[0050] Specifically, the width of the positioning protrusion 61 is equal to the width of the exhaust groove 72 , and the height of the positioning protrusion 61 is less than the depth of the exhaust groove 72 .

[0051] By adopting the above technical solution, the positioning protrusion 61 can position the rubber sleeve 6 while not affecting the installation of the rubber sleeve 6 into the assembly groove 71 .

[0052] Furthermore, the method for realizing a sonic motor according to the present invention comprises the following steps:

[0053] (1) Two magnetic tiles 3 are symmetrically arranged on the inner wall of the housing 2 to provide a driving magnetic field for the motor;

[0054] (2) The coil 54 wound on the four winding posts 521 forms an electric field when energized;

[0055] (3) The spring assembly 53 is used to connect to the power supply and provide elastic force for the reciprocating rotation of the rotor assembly 5;

[0056] (4) The rubber sleeve 6 is used to support the core shaft 51 to rotate back and forth.

[0057] To sum up, the iron core 52 of the present invention includes four mutually symmetrical winding poles 521, which can be used to wind four coils 54. When the coils 54 are energized, they are equivalent to four magnetic tiles, which interact with the two symmetrical magnetic tiles 3 on the inner wall of the shell 2 to provide driving force for the motor. Compared with the four magnetic tiles set in the prior art, only two magnetic tiles 3 are used while ensuring that the vibration sense remains unchanged, thereby greatly reducing the production cost; because the present invention only uses two symmetrically set magnetic tiles 3, when the magnetic tiles 3 are assembled, there is no influence of the magnetic tiles on the same side, so there is no need to use a plastic frame to position the magnetic tiles, thereby further reducing the production cost; the present invention replaces the bearing in the tailstock in the prior art with a rubber sleeve 6. Because rubber has certain elasticity and hardness, it can not only support the core shaft 51, but also ensure that the core shaft 51 can rotate back and forth at a small angle in the rubber sleeve 6, effectively reducing the production cost and reducing the noise when the motor is working.

[0058] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sonic motor comprising a housing, characterized in that: A tailstock is provided at one end of the shell, an output shaft is provided at the other end of the shell, a rotor assembly is provided inside the shell, and the rotor assembly includes a core shaft, an iron core is sleeved on the circumference of the core shaft, the iron core includes four mutually symmetrical winding posts, and coils are wound on the four winding posts. When the coils are energized, they are equivalent to four magnetic tiles, which interact with two symmetrical magnetic tiles on the inner wall of the shell to provide driving force for the motor. Under the premise of ensuring that the vibration sense remains unchanged, only two magnetic tiles are used. Since only two symmetrically arranged magnetic tiles are used, there is no influence of the magnetic tiles on the same side when the magnetic tiles are assembled, so there is no need to use a plastic frame to position the magnetic tiles; a spring assembly is provided on one end of the core shaft located at the tailstock, and the other end of the core shaft is connected to the output shaft, and two mutually symmetrical magnetic tiles are provided on the inner wall of the shell; An assembly groove is provided inside the tailstock, and a rubber sleeve is provided inside the assembly groove. The end of the core shaft is embedded in the rubber sleeve. The outer diameter of the core shaft is equal to the inner diameter of the rubber sleeve. A number of exhaust grooves are provided on the inner wall of the assembly groove. The rubber has a certain elasticity and hardness, so it can not only support the core shaft, but also ensure that the core shaft can reciprocate at a small angle in the rubber sleeve.

2. The sonic motor according to claim 1, characterized in that: The winding column is a T-shaped structure.

3. The sonic motor according to claim 1, wherein: The output shaft is connected to the housing via a rolling bearing.

4. The sonic motor according to claim 1, characterized in that: A sleeve is provided on one end of the core shaft close to the output shaft.

5. The sonic motor according to claim 1, characterized in that: The circumference of the rubber sleeve is provided with positioning protrusions corresponding to the exhaust grooves.

6. The sonic motor according to claim 5, characterized in that: The width of the positioning protrusion is equal to the width of the exhaust groove, and the height of the positioning protrusion is less than the depth of the exhaust groove.

7. The method for realizing a sonic motor according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Two magnetic tiles are symmetrically arranged on the inner wall of the housing to provide a driving magnetic field for the motor; (2) The coils wound on the four winding poles form an electric field when energized; (3) The spring assembly is used to connect to the power supply and provide elastic force for the reciprocating rotation of the rotor assembly; (4) The rubber sleeve is used to support the reciprocating rotation of the core shaft.

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