Motor of electric toothbrush

Abstract

The utility model provides a motor of an electric toothbrush, which comprises an outer shell, an annular magnet and a stator component, when a coil is electrified, an electromagnetic field is generated to form a first magnetic pole, a second magnetic pole, a third magnetic pole and a fourth magnetic pole, and the first magnetic pole and the second magnetic pole respectively generate attractive force and repulsive force to one magnetic pole of the annular magnet; the third magnetic pole and the fourth magnetic pole generate attraction force and repulsive force on the other magnetic pole of the annular magnet respectively, the attraction force and the repulsive force are in the same direction, and the annular magnet and the driving shaft are driven to rotate clockwise or anticlockwise. When the coil is not electrified, the polarity of each iron core coil assembly gradually disappears, and the iron core of the first coil iron core assembly and the iron core of the second coil iron core assembly have attraction to one magnetic pole of the annular magnet. The iron core of the third coil iron core assembly and the iron core of the fourth coil iron core assembly have attraction to the other magnetic pole of the annular magnet, so that the annular magnet and the driving shaft can automatically recover to the initial balance position.

Description

Technical Field

[0001] The utility model relates to the technical field of electric toothbrushes, in particular to a motor of an electric toothbrush. Background Art

[0002] An electric toothbrush mainly consists of a motor and a brush head. The rapid rotation of the motor causes the brush head to produce high-frequency vibrations, instantly breaking down the toothpaste into fine foam and deeply cleaning the gaps between teeth.

[0003] The existing electric toothbrush motor mainly includes a housing, a swing shaft, a coil, two rotors, two groups of magnets and a torsion spring. The coil and the two rotors are both mounted on the swing shaft, and the two rotors are located on both sides of the coil. The two groups of magnets are fixed on the inner wall of the housing and are respectively wound around the outer periphery of the two rotors. When the coil is energized, the coil generates an electromagnetic field. According to the principle that like poles repel each other and opposite poles attract each other, the force between the electromagnetic field and the fixed magnetic field of each group of magnets drives the rotor and the swing shaft to swing to the required angle, thereby driving the toothbrush to vibrate. At this time, the torsion spring twists with the swing shaft. When the coil is no longer energized, the swing shaft is reset to its initial position under the torsional restoring force of the torsion spring. Since it needs to be reset with the help of the elastic force of the torsion spring, not only the structure is more complicated and the cost is increased, but also the torsion spring is easy to break after long-term use, which affects the service life. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the electric toothbrush motor in the prior art, such as the complex structure and short service life, thereby providing an electric toothbrush motor with a simple structure and a long service life.

[0005] To this end, the utility model provides a motor for an electric toothbrush, comprising an outer shell, an annular magnet and a stator component, the outer shell having a cavity and a drive shaft rotatably installed in the cavity; the annular magnet is sleeved on the drive shaft and rotates in conjunction with the drive shaft, the annular magnet having two magnetic poles arranged on both sides of the radial direction; the stator component is arranged in the cavity, comprising a first coil core component, a second coil core component, a third coil core component and a fourth coil core component sequentially spaced along the circumference of the annular magnet, the first coil core component and the second coil core component are arranged adjacent to one of the magnetic poles of the annular magnet, the third coil core component and the fourth coil core component are arranged adjacent to the annular Another magnetic pole of the magnet is set, the first coil core assembly, the second coil core assembly, the third coil core assembly and the fourth coil core assembly have a first magnetic pole, a second magnetic pole, a third magnetic pole and a fourth magnetic pole which are arranged corresponding to the magnetic poles in the radial direction of the annular magnet in the power-on state; wherein, in the non-power-on state, one of the magnetic poles of the annular magnet is located between the first coil core assembly and the second coil core assembly, and the other magnetic pole is located between the third coil core assembly and the fourth coil core assembly; in the power-on state, the polarity of the first magnetic pole is opposite to that of the second magnetic pole, the polarity of the third magnetic pole is opposite to that of the fourth magnetic pole, and the polarity of the first magnetic pole is the same as that of the fourth magnetic pole.

[0006] The stator component includes: an iron core, including an iron core shell fixed on the inner wall of the outer shell, a first iron core arm extending from four corners of the inner wall of the iron core shell toward the annular magnet, and an arc-shaped second iron core arm arranged at one end of the first iron core arm adjacent to the annular magnet and extending toward both sides.

[0007] The stator component also includes: two bobbins, respectively fixed at the two ends of the core shell in the length direction, the bobbin includes an annular frame, a first winding arm extending from the four corners of the annular frame toward the annular magnet, and an arc-shaped second winding arm arranged at one end of the first winding arm adjacent to the annular magnet, the first winding arm is arranged corresponding to the first core support arm, and the second winding arm is arranged corresponding to the second core support arm; four coils are respectively wound on the two first winding arms of the two bobbins that are correspondingly arranged to form a first coil core assembly, a second coil core assembly, a third coil core assembly and a fourth coil core assembly.

[0008] A first slot and a second slot are formed on the first winding arm and the second winding arm, respectively, for the end of the first core branch arm and the end of the second core branch arm to be correspondingly inserted.

[0009] A limiting structure for limiting the rotation position of the driving shaft is provided between the driving shaft and the outer shell, and the limiting structure includes: a first limiting plate, which is fixed on the driving shaft and has a protrusion provided on its outer wall; a second limiting plate, which is fixed in the middle of the cavity and has a through hole in the middle for installing the first limiting plate, and the inner wall of the through hole has two stoppers that can resist the protrusion.

[0010] The technical solution of this utility model has the following advantages:

[0011] 1. The motor of the electric toothbrush provided by the utility model generates an electromagnetic field to form a first magnetic pole, a second magnetic pole, a third magnetic pole and a fourth magnetic pole when the coil is energized. The first magnetic pole and the second magnetic pole respectively generate an attraction force and a repulsion force on one magnetic pole of the annular magnet, and the third magnetic pole and the fourth magnetic pole respectively generate an attraction force and a repulsion force on the other magnetic pole of the annular magnet, and the directions of the above attraction force and repulsion force are the same, driving the annular magnet to rotate clockwise or counterclockwise, thereby driving the drive shaft to rotate clockwise or counterclockwise; when the coil is not energized, the polarity of each core coil assembly gradually disappears, the iron core of the first coil iron core assembly and the iron core of the second coil iron core assembly both have an attraction force on one magnetic pole of the annular magnet, and the iron core of the third coil iron core assembly and the iron core of the fourth coil iron core assembly both have an attraction force on the other magnetic pole of the annular magnet, so that the annular magnet and the drive shaft can automatically return to the initial equilibrium position. The above structure is simple, eliminates the need for torsion springs, and extends the service life.

[0012] 2. The motor of the electric toothbrush provided by the utility model has a first slot and a second slot formed on the first winding arm and the second winding arm respectively for the end of the first core support arm and the end of the second core support arm to be correspondingly inserted, so that the assembly between the wire clamp and the core is faster and more convenient.

[0013] 3. The motor of the electric toothbrush provided by the utility model has a limiting structure comprising: a first limiting plate, which is fixed on the driving shaft and has a protrusion arranged on its outer wall; a second limiting plate, which is fixed in the middle of the cavity and has a through hole in the middle for installing the first limiting plate, and the inner wall of the through hole has two stoppers that can resist the protrusion, thereby limiting the rotation position of the driving shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1A three-dimensional diagram of the motor of the electric toothbrush of the present invention;

[0016] Figure 2 The exploded structure diagram of the electric toothbrush motor;

[0017] Figure 3 is a three-dimensional diagram of a stator component;

[0018] Figure 4 It is a schematic diagram of the exploded structure of the stator component;

[0019] Figure 5 It is a structural schematic diagram of the iron core;

[0020] Figure 6 It is a three-dimensional picture of the wire frame;

[0021] Figure 7 It is a schematic diagram of the state where the stator component, the drive shaft and the annular magnet are in an initial equilibrium position when no power is supplied;

[0022] Figure 8 It is a schematic diagram of the magnetic field of the stator component, the drive shaft and the annular magnet when the coil is energized in the forward direction;

[0023] Fig. 9 It is a schematic diagram of the magnetic field of the stator component, the drive shaft and the annular magnet when the coil is reversely energized;

[0024] Fig.10 It is a schematic diagram of the structure of the first limiting plate, the second limiting plate and the driving shaft.

[0025] Explanation of the accompanying drawings: 1. outer shell; 2. drive shaft; 3. annular magnet; 5. stator component; 6. first coil core assembly; 7. second coil core assembly; 8. third coil core assembly; 9. fourth coil core assembly; 10. core; 11. first magnetic pole; 12. second magnetic pole; 13. third magnetic pole; 14. fourth magnetic pole; 15. core shell; 16. first core arm; 17. second core arm; 18. bobbin; 19. annular skeleton; 20. coil; 21. first winding arm; 22. second winding arm; 23. first slot; 24. second slot; 25. first limit plate; 26. second limit plate; 27. bump; 28. through hole; 29. ​​stopper. DETAILED DESCRIPTION

[0026] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example

[0031] This embodiment provides a motor for an electric toothbrush, such as Figure 1 and Figure 3 As shown, it includes an outer shell 1, a drive shaft 2, an annular magnet 3 and a stator component 5.

[0032] The outer shell 1 has a cavity and a drive shaft 2 rotatably mounted in the cavity. One end of the drive shaft 2 extends out of the outer shell 1 and is connected to the brush head of the toothbrush. A limit structure for limiting the rotation position of the drive shaft 2 is provided between the drive shaft 2 and the outer shell 1. Figure 2 and Fig.10 As shown, the limiting structure includes: a first limiting plate 25, fixed on the driving shaft 2, and having a protrusion 27 arranged on its outer wall; a second limiting plate 26, fixed in the middle of the cavity, and having a through hole 28 in the middle for installing the first limiting plate 25, and the inner wall of the through hole 28 has two stoppers 29 that can resist the protrusion 27.

[0033] The annular magnet 3 is sleeved on the driving shaft 2 and rotates in conjunction with the driving shaft 2. The annular magnet 3 has two magnetic poles disposed on both sides of the radial direction. Since only one annular magnet 3 is required, the structure is simpler and easy to assemble.

[0034] The stator component 5 is arranged in the cavity, such as Figure 7 As shown, it includes a first coil core assembly 6, a second coil core assembly 7, a third coil core assembly 8 and a fourth coil core assembly 9 which are sequentially spaced and distributed along the circumference of the annular magnet 3. The first coil core assembly 6 and the second coil core assembly 7 are arranged adjacent to one of the magnetic poles (S pole) of the annular magnet 3, and the third coil core assembly 8 and the fourth coil core assembly 9 are arranged adjacent to the other magnetic pole (N pole) of the annular magnet 3. Figure 8 and Fig. 9 As shown, the first coil core assembly 6, the second coil core assembly 7, the third coil core assembly 8 and the fourth coil core assembly 9 have a first magnetic pole 11, a second magnetic pole 12, a third magnetic pole 13 and a fourth magnetic pole 14 which are arranged corresponding to the magnetic poles in the radial direction of the annular magnet 3 when powered.

[0035] In this embodiment, Figure 3 and Figure 4 As shown, the stator component 5 includes an iron core 10, two bobbins 18 and four coils 20. Figure 5 As shown, the iron core 10 includes an iron core shell 15 fixed on the inner wall of the outer shell 1, a first iron core arm 16 extending from the four corners of the inner wall of the iron core shell 15 toward the direction of the annular magnet 3, and an arc-shaped second iron core arm 17 provided at one end of the first iron core arm 16 adjacent to the annular magnet 3 and extending toward both sides. In this embodiment, as Figure 5 As shown, the distance between the two arc-shaped second core arms 17 of the first coil core assembly 6 and the second coil core assembly 7 is D1, the distance between the two arc-shaped second core arms 17 of the third coil core assembly 8 and the fourth coil core assembly 9 is also D1, the distance between the two arc-shaped second core arms 17 of the first coil core assembly 6 and the fourth coil core assembly 9 is D2, and the distance between the two arc-shaped second core arms 17 of the second coil core assembly 7 and the third coil core assembly 8 is also D2, D1<D2, so that when the coil is not energized, the first coil core assembly The second core arm 17 of the component 6 and the second core arm 17 of the second coil core component 7 both have an attraction to one magnetic pole of the annular magnet, and the second core arm 17 of the third coil core component 8 and the second core arm 17 of the fourth coil core component 9 both have an attraction to the other magnetic pole of the annular magnet, so that the annular magnet and the drive shaft can automatically return to the initial equilibrium position, that is, the connecting line of the two magnetic poles of the annular magnet is located between the first coil core component 6 and the second coil core component 7, and also between the third coil core component 8 and the fourth coil core component 9. Two wire racks 18 are respectively fixed at both ends of the length direction of the core shell 15, such as Figure 4 and Figure 6As shown, the bobbin 18 includes an annular skeleton 19, a first winding arm 21 extending from four corners of the annular skeleton 19 toward the annular magnet 3, and an arc-shaped second winding arm 22 arranged at one end of the first winding arm 21 adjacent to the annular magnet 3, the first winding arm 21 is arranged corresponding to the first core arm 16, and the second winding arm 22 is arranged corresponding to the second core arm 17, and the first winding arm 21 and the second winding arm 22 are respectively formed with a first slot 23 and a second slot 24 for correspondingly inserting the end of the first core arm 16 and the end of the second core arm 17; four coils 20 are respectively wound on two correspondingly arranged first winding arms 21 of the two bobbins 18 to form a first coil core assembly 6, a second coil core assembly 7, a third coil core assembly 8 and a fourth coil core assembly 9.

[0036] The working principle of the electric toothbrush motor of the utility model is as follows:

[0037] When the coil is not energized, Figure 7 As shown, the left and right sides of the annular magnet 3 are respectively the S pole and the N pole, the annular magnet 3 is in a balanced state, the S pole of the annular magnet 3 is located between the first coil core assembly 6 and the second coil core assembly 7, and the N pole of the annular magnet 3 is located between the third coil core assembly 8 and the fourth coil core assembly 9.

[0038] When the coil Figure 7 The unpowered state shown switches to Figure 8 In the forward power-on state shown, the first magnetic pole 11 of the first coil core assembly 6 is an S pole, the second magnetic pole 12 of the second coil core assembly 7 is an N pole, the third magnetic pole 13 of the third coil core assembly 8 is an N pole, and the fourth magnetic pole 14 of the fourth coil core assembly 9 is an S pole, so that there is a repulsive force between the first magnetic pole 11 (S pole) and the S pole of the annular magnet 3, an attractive force between the second magnetic pole 12 (N pole) and the S pole of the annular magnet 3, a repulsive force between the third magnetic pole 13 (N pole) and the N pole of the annular magnet 3, and an attractive force between the fourth magnetic pole 14 (S pole) and the N pole of the annular magnet 3, thereby driving the annular magnet 3 and the drive shaft 2 to rotate counterclockwise, and the rotation angle is a.

[0039] When the coil Figure 7 The unpowered state shown switches to Fig. 9In the reverse power-on state shown, the first magnetic pole 11 of the first coil core assembly 6 is an N pole, the second magnetic pole 12 of the second coil core assembly 7 is an S pole, the third magnetic pole 13 of the third coil core assembly 8 is an S pole, and the fourth magnetic pole 14 of the fourth coil core assembly 9 is an N pole, so that there is an attraction between the first magnetic pole 11 (N pole) and the S pole of the annular magnet 3, there is a repulsion between the second magnetic pole 12 (S pole) and the S pole of the annular magnet 3, there is an attraction between the third magnetic pole 13 (S pole) and the N pole of the annular magnet 3, and there is a repulsion between the fourth magnetic pole 14 (N pole) and the N pole of the annular magnet 3, thereby driving the annular magnet 3 and the drive shaft 2 to rotate clockwise, and the rotation angle is a. In this way, the coil repeatedly repeats positive power-on, power-off, reverse power-on, and power-off, thereby driving the annular magnet 3 and the drive shaft 2 to rotate clockwise or counterclockwise, and the rotation angle of the drive shaft 2 is 2a, which is a large rotation angle.

[0040] The motor of the electric toothbrush provided by the utility model generates an electromagnetic field to form a first magnetic pole 11, a second magnetic pole 12, a third magnetic pole 13 and a fourth magnetic pole 14 when the coil 20 is energized. The first magnetic pole 11 and the second magnetic pole 12 respectively generate an attractive force and a repulsive force on one magnetic pole of the annular magnet 3, and the third magnetic pole 13 and the fourth magnetic pole 14 respectively generate an attractive force and a repulsive force on the other magnetic pole of the annular magnet 3. The directions of the above-mentioned attractive force and repulsive force are the same, driving the annular magnet 3 to rotate clockwise or counterclockwise, thereby driving the driving shaft 2 to rotate clockwise or counterclockwise; when the coil is not energized, the polarity of each core coil assembly gradually disappears, the core of the first coil core assembly 6 and the core of the second coil core assembly 7 both have an attractive force on one magnetic pole of the annular magnet, and the core of the third coil core assembly 8 and the core of the fourth coil core assembly 9 both have an attractive force on the other magnetic pole of the annular magnet 3, so that the annular magnet and the driving shaft can automatically return to the initial equilibrium position. The above-mentioned structure is simple, the torsion spring is omitted, and the service life is extended.

[0041] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A motor for an electric toothbrush, characterized in that: include: An outer shell (1) having a cavity and a drive shaft (2) rotatably mounted in the cavity; An annular magnet (3) is sleeved on the drive shaft (2) and rotates in conjunction with the drive shaft (2), the annular magnet (3) having two magnetic poles disposed on two radial sides thereof; A stator component (5) is arranged in the mold cavity, comprising a first coil core component (6), a second coil core component (7), a third coil core component (8) and a fourth coil core component (9) which are sequentially spaced and distributed along the circumference of the annular magnet (3); the first coil core component (6) and the second coil core component (7) are arranged adjacent to one of the magnetic poles of the annular magnet (3); the third coil core component (8) and the fourth coil core component (9) are arranged adjacent to the other magnetic pole of the annular magnet (3); the first coil core component (6), the second coil core component (7), the third coil core component (8) and the fourth coil core component (9) have a first magnetic pole (11), a second magnetic pole (12), a third magnetic pole (13) and a fourth magnetic pole (14) which are arranged corresponding to the magnetic poles in the radial direction of the annular magnet (3) when powered on; Wherein, in the non-powered state, one magnetic pole of the annular magnet (3) is located between the first coil core assembly (6) and the second coil core assembly (7), and the other magnetic pole is located between the third coil core assembly (8) and the fourth coil core assembly (9); When powered on, the polarity of the first magnetic pole (11) is opposite to that of the second magnetic pole (12), the polarity of the third magnetic pole (13) is opposite to that of the fourth magnetic pole (14), and the polarity of the first magnetic pole (11) is the same as that of the fourth magnetic pole (14).

2. The motor of the electric toothbrush according to claim 1, characterized in that: The stator component (5) comprises: The iron core (10) comprises an iron core shell (15) fixed on the inner wall of the outer shell (1), a first iron core branch arm (16) extending from four corners of the inner wall of the iron core shell (15) toward the annular magnet (3), and an arc-shaped second iron core branch arm (17) provided at one end of the first iron core branch arm (16) adjacent to the annular magnet (3) and extending toward both sides.

3. The motor of the electric toothbrush according to claim 2, characterized in that: The stator component (5) further comprises: Two wire racks (18) are respectively fixed at two ends of the core shell (15) in the length direction, the wire rack (18) comprises an annular frame (19), a first winding arm (21) extending from four corners of the annular frame (19) toward the annular magnet (3), and an arc-shaped second winding arm (22) arranged at one end of the first winding arm (21) adjacent to the annular magnet (3), the first winding arm (21) being arranged corresponding to the first core support arm (16), and the second winding arm (22) being arranged corresponding to the second core support arm (17); Four coils (20) are respectively wound on two first winding arms (21) of the two bobbins (18) which are arranged correspondingly to form a first coil core assembly (6), a second coil core assembly (7), a third coil core assembly (8) and a fourth coil core assembly (9).

4. The motor of the electric toothbrush according to claim 3, characterized in that: The first winding arm (21) and the second winding arm (22) are respectively formed with a first slot (23) and a second slot (24) for correspondingly inserting the end of the first iron core support arm (16) and the end of the second iron core support arm (17).

5. The motor of the electric toothbrush according to claim 1, characterized in that: A limiting structure for limiting the rotational position of the driving shaft (2) is provided between the driving shaft (2) and the outer shell (1).

6. The motor of the electric toothbrush according to claim 5, characterized in that: The limiting structure comprises: A first limiting plate (25) is fixed on the driving shaft (2) and has a protrusion (27) arranged on its outer wall; The second limiting plate (26) is fixed in the middle of the cavity and has a through hole (28) in the middle for installing the first limiting plate (25). The inner wall of the through hole (28) has two stoppers (29) that can abut against the protrusion (27).

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