Medium and low frequency sweep vibration motor

Abstract

A stator part comprises a coil rack, two groups of annular coils wound on the coil rack, a pair of magnetic steels arranged at the end parts opposite to the annular coils respectively, and an upper bearing and a lower bearing arranged at the centers of the end parts of the upper end and the lower end of the motor shell, wherein the outer sides of the magnetic steels are fixedly attached to the inner wall of the motor shell; the rotor part comprises a rotor iron core and a rotating shaft penetrating through a shaft hole of the rotor iron core; the end cover covers the opening at the bottom end of the motor shell, and the lower bearing is arranged on the end cover; the coil frame is fixedly connected with the motor shell, the rotor iron core is arranged in an inner cavity of the coil frame, the upper end of the rotating shaft continuously penetrates through the motor shell and the upper bearing and extends outwards, and the lower end of the rotating shaft is connected with the lower bearing. The motor is simple and compact in structure, large in rotating shaft swing amplitude, low in manufacturing cost, stable in performance and suitable for popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a medium and low frequency sweeping and vibrating motor. Background Technique

[0002] An electric toothbrush makes the brush head generate high-frequency vibration through the rapid rotation or vibration of the motor core, instantly decomposes toothpaste into fine foam, and deeply cleans the tooth gaps. At the same time, the vibration of the bristles can promote blood circulation in the oral cavity and has a massage effect on the gingival tissue.

[0003] At present, there appears a sweeping and vibrating brushing mode for electric toothbrushes, which realizes the integration of the brush rod and the bristles' sweeping and vibration and a larger swing amplitude, and is more in line with the Bass Technique. The characteristic of this brushing mode is that the swing amplitude of the brush head is large, generally between 30° and 60°. The existing sonic vibration motors cannot complete such a large swing amplitude action, and the motors that can achieve this performance are completed by using the servo motor and stepper motor structures and through servo technology control. As a result, the cost of this brushing mode has increased by an order of magnitude, restricting the popularization of the sweeping and vibrating toothbrush and the beneficiary groups. Content of the Utility Model

[0004] The purpose of the utility model is to provide a medium and low frequency sweeping and vibrating motor, which has a simple and compact structure, a large swing amplitude of the rotating shaft, low manufacturing cost, stable performance, and is suitable for popularization and application. It solves the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A medium and low frequency sweeping and vibrating motor, comprising: a stator part, including a coil frame, two groups of annular coils wound on the coil frame, a pair of magnetic steel respectively arranged at the end parts opposite to the annular coils, the outer sides of the magnetic steel are fixedly attached to the inner wall of the motor housing, an upper bearing and a lower bearing arranged at the centers of the upper and lower ends of the motor housing; a rotor part, including a rotor core and a rotating shaft passing through the shaft hole of the rotor core; an end cover covering the bottom opening of the motor housing, and the lower bearing is arranged on the end cover; the coil frame is fixedly connected with the motor housing, the rotor core is arranged in the inner cavity of the coil frame, the upper end of the rotating shaft continuously passes through the motor housing and the upper bearing and extends outwards, and the lower end of the rotating shaft is connected with the lower bearing.

[0006] Preferably, there are two pairs of magnetic steel, and the two pairs of magnetic steel are respectively arranged at the left and right end parts of the annular coil. Each pair of magnetic steel includes an N-pole magnetic steel and an S-pole magnetic steel. Between the two pairs of magnetic steel arranged face to face, the N-pole magnetic steel faces the N-pole magnetic steel, and the S-pole magnetic steel faces the S-pole magnetic steel.

[0007] Preferably, magnetic steel positioning protrusions are arranged on the inner wall surface of the motor housing, and the magnetic steel is positioned and fixedly connected to the motor housing 1 by the magnetic steel positioning protrusions.

[0008] Preferably, the bobbin holder includes a left bobbin holder and a right bobbin holder that are spliced together face to face. The left bobbin holder is provided with positioning posts and positioning holes, and the right bobbin holder is correspondingly provided with positioning holes and positioning posts at the positions corresponding to the positioning posts and positioning holes on the left bobbin holder. When the left bobbin holder and the right bobbin holder are spliced together, the positioning posts are inserted into the positioning holes to realize the integral fixed connection of the left bobbin holder and the right bobbin holder.

[0009] Preferably, a bobbin holder positioning protrusion is provided on the inner wall surface of the motor housing, and the bobbin holder is positioned and fixedly connected to the motor housing by the bobbin holder positioning protrusion.

[0010] Preferably, the two sets of toroidal coils are wound in the same direction and are connected in series circuit.

[0011] Preferably, an upper bearing seat is provided on the upper end surface of the motor housing, the upper bearing is installed in the upper bearing seat, a lower bearing seat is provided on the upper end surface of the end cover, the lower bearing is installed in the lower bearing seat, and the upper bearing, the rotating shaft and the lower bearing are coaxially arranged.

[0012] Preferably, the end cover is provided with a wire routing hole communicating with the upper and lower end surfaces, and the wiring ends of the toroidal coils pass through the wire routing hole.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] In the present utility model, through the control of frequency conversion technology, the rotor can achieve a larger swing amplitude. Within this swing amplitude range, by changing different frequencies, different swing angles can be achieved, which more conforms to the requirements of the Bass brushing method for brushing actions, helps to improve the cleaning efficiency and effect of brushing, and compared with the traditional complex mechanical structure cooperating with a servo system to accurately control the swing amplitude of the brush head, it reduces complex mechanical components and electronic control elements, can reduce the failure points, improve the reliability and durability of the motor, and reduces the production cost, enabling more consumers to afford this efficient brushing mode electric toothbrush, thereby expanding the potential market beneficiary group. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an exploded view of the structure of the present utility model Figure I ;

[0016] Figure 2 is an exploded view of the structure of the present utility model Figure II ;

[0017] Figure 3 is a three-dimensional external view of the present utility model;

[0018] Figure 4 is a schematic view of the end cover structure of the present utility model;

[0019] Figure 5 Schematic diagram of the magnet positioning protrusion structure of the present utility model;

[0020] Figure 6 Schematic diagram of the coil bobbin positioning protrusion structure of the present utility model.

[0021] In the figure: 1 motor housing; 11 upper bearing seat; 12 magnet positioning protrusion; 13 coil bobbin positioning protrusion; 2 end cover; 21 lower bearing seat; 22 wire routing hole; 3 rotating shaft; 4 upper bearing; 5 rotor core; 51 shaft hole; 6 lower bearing; 7 coil bobbin; 71 left coil bobbin; 72 right coil bobbin; 73 positioning post; 74 positioning hole; 8 magnet; 81 N-pole magnet; 82 S-pole magnet; 9 annular coil. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. 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 protection scope of the present utility model.

[0023] Please refer to Figures 1-6 , a medium and low frequency sweeping and vibrating motor, including a stator part, including a coil bobbin 7, two groups of annular coils 9 wound on the coil bobbin 7, a pair of magnets 8 respectively arranged at the end parts facing the annular coils 9, the outer sides of the magnets 8 are fixedly attached to the inner wall of the motor housing 1, and upper bearings 4 and lower bearings 6 are arranged at the center of the upper and lower ends of the motor housing 1; a rotor part, including a rotor core 5 and a rotating shaft 3 passing through the shaft hole 51 of the rotor core 5; an end cover 2, covering the bottom opening of the motor housing 1, and the lower bearing 6 is arranged on the end cover 2; the coil bobbin 7 is fixedly connected to the motor housing 1, the rotor core 5 is arranged in the inner cavity of the coil bobbin 7, the upper end of the rotating shaft 3 continuously passes through the motor housing 1 and the upper bearing 4 and extends outwards, and the lower end of the rotating shaft 3 is connected to the lower bearing 6.

[0024] There are two pairs of the magnets 8, magnet positioning protrusions 12 are arranged on the inner wall surface of the motor housing 1, the magnets 8 are positioned and fixedly connected to the motor housing 1 by the magnet positioning protrusions 12, the two pairs of magnets 8 are respectively arranged at the left and right end parts of the annular coil 9, each pair of magnets 8 includes an N-pole magnet 81 and an S-pole magnet 82, between the two pairs of magnets 8 arranged facing each other, the N-pole magnets 81 face each other, and the S-pole magnets 82 face each other.

[0025] The coil holder 7 includes a left coil holder 71 and a right coil holder 72 that are spliced face to face. A positioning post 73 and a positioning hole 74 are provided on the left coil holder 71. Corresponding to the positions of the positioning post 73 and the positioning hole 74 on the left coil holder 71, the right coil holder 72 is provided with a positioning hole 74 and a positioning post 73 respectively. When the left coil holder 71 and the right coil holder 72 are spliced with each other, the positioning post 73 is inserted into the positioning hole 74 to realize the integral fixed connection of the left coil holder 71 and the right coil holder 72. A coil holder positioning protrusion 13 is provided on the inner wall surface of the motor housing 1. The coil holder 7 is positioned and fixedly connected to the motor housing 1 by the coil holder positioning protrusion 13. The two groups of annular coils 9 are wound in the same direction and are connected in series electrically.

[0026] An upper bearing seat 11 is provided on the upper end surface of the motor housing 1. The upper bearing 4 is installed in the upper bearing seat 11. A lower bearing seat 21 is provided on the upper end surface of the end cover 2. The lower bearing 6 is installed in the lower bearing seat 21. The upper bearing 4, the rotating shaft 3, and the lower bearing 6 are coaxially arranged. A wire passing hole 22 is provided on the end cover 2 and runs through the upper and lower end surfaces. The wiring ends of the annular coils 9 pass through the wire passing hole 22.

[0027] During operation, the control circuit board in the electric toothbrush inputs a current with a specific frequency to the annular coil 9 through the control mode set by software, so that the annular coil 9 cooperates with the rotor core 5 to generate a magnetic field, which is called a variable magnetic field here. After the variable magnetic field is generated, it will interfere with the fixed magnetic field formed by the magnet 8, thereby driving the rotor core 5 to swing and rotate, and then driving the toothbrush head connected to the end of the rotating shaft 3 to swing left and right, playing the role of brushing teeth.

[0028] In summary, in this utility model, through the control of frequency conversion technology, the rotor can achieve a larger swing amplitude. Within this swing amplitude range, by changing different frequencies, different swing angles can be achieved, which more conforms to the requirements of the Bass brushing method for brushing actions, helps to improve the cleaning efficiency and effect of brushing teeth. And compared with the traditional complex mechanical structure and servo system to accurately control the swing amplitude of the brush head, it reduces complex mechanical components and electronic control elements, can reduce the failure points, improve the reliability and durability of the motor, and reduces the production cost, enabling more consumers to afford this high-efficiency brushing mode electric toothbrush, thus expanding the potential market beneficiary group.

[0029] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A medium and low frequency sweep vibration motor, characterized in that: include: The stator part comprises a coil frame (7), two groups of annular coils (9) wound on the coil frame (7), a pair of magnetic steels (8) respectively arranged at the ends facing the annular coils (9), the outer sides of the magnetic steels (8) fixedly attached to the inner wall of the motor housing (1), and an upper bearing (4) and a lower bearing (6) arranged at the center of the upper and lower ends of the motor housing (1); The rotor part comprises a rotor core (5) and a rotating shaft (3) passing through an axial hole (51) of the rotor core (5); An end cover (2) is arranged at the bottom opening of the motor housing (1), and the lower bearing (6) is arranged on the end cover (2); The coil frame (7) is fixedly connected to the motor housing (1), the rotor core (5) is arranged in the inner cavity of the coil frame (7), the upper end of the rotating shaft (3) continuously penetrates the motor housing (1) and the upper bearing (4) and protrudes outward, and the lower end of the rotating shaft (3) is connected to the lower bearing (6).

2. A medium-low frequency sweep vibration motor according to claim 1, characterized in that: The magnetic steel (8) is provided in two pairs. The two pairs of magnetic steel (8) are respectively provided at the left and right ends of the annular coil (9). Each pair of magnetic steel (8) comprises an N-pole magnetic steel (81) and an S-pole magnetic steel (82). Between the two pairs of magnetic steel (8) arranged opposite to each other, the N-pole magnetic steel (81) is arranged facing the N-pole magnetic steel (81), and the S-pole magnetic steel (82) is arranged facing the S-pole magnetic steel (82).

3. The medium-low frequency sweep vibration motor according to claim 1, characterized in that: A magnetic steel positioning protrusion (12) is provided on the inner wall surface of the motor housing (1), and the magnetic steel (8) is positioned and fixedly connected to the motor housing (1) by the magnetic steel positioning protrusion (12).

4. The medium-low frequency sweep vibration motor according to claim 1, characterized in that: The coil frame (7) comprises a left coil frame (71) and a right coil frame (72) which are spliced ​​together. The left coil frame (71) is provided with a positioning column (73) and a positioning hole (74). The right coil frame (72) is provided with a positioning hole (74) and a positioning column (73) at positions corresponding to the positioning column (73) and the positioning hole (74) on the left coil frame (71). When the left coil frame (71) and the right coil frame (72) are spliced ​​together, the positioning column (73) is inserted into the positioning hole (74), so that the left coil frame (71) and the right coil frame (72) are fixedly connected as one body.

5. The medium-low frequency sweep vibration motor according to claim 1, characterized in that: A coil frame positioning protrusion (13) is provided on the inner wall surface of the motor housing (1), and the coil frame (7) is positioned and fixedly connected to the motor housing (1) by the coil frame positioning protrusion (13).

6. The medium-low frequency sweep vibration motor according to claim 1, characterized in that: The two groups of annular coils (9) are wound in the same direction and connected in series.

7. The medium-low frequency sweep vibration motor according to claim 1, characterized in that: An upper bearing seat (11) is arranged on the upper end surface of the motor housing (1), and the upper bearing (4) is installed in the upper bearing seat (11). A lower bearing seat (21) is arranged on the upper end surface of the end cover (2), and the lower bearing (6) is installed in the lower bearing seat (21). The upper bearing (4), the rotating shaft (3) and the lower bearing (6) are coaxially arranged.

8. The medium-low frequency sweep vibration motor according to claim 1, characterized in that: The end cover (2) is provided with a wiring hole (22) communicating with the upper and lower end surfaces, and the wiring terminal of the annular coil (9) is inserted into the wiring hole (22).

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