Linear oscillation motor and electric cleaning device

Abstract

The utility model belongs to the linear motor technical field of electric toothbrush, disclose a kind of linear oscillation motor and electric cleaning device, comprising: shell, permanent magnet component, the permanent magnet component is multiple permanent magnet being set on the shell with interval, and the permanent magnet component is stator;Armature, the armature is provided with two groups of coils on the core in axial direction, and the both ends of core are connected on the shell by leaf spring, and located above the permanent magnet component, and the armature is rotor.

Description

Technical Field

[0001] This utility model relates to the field of linear motor technology for electric toothbrushes, and in particular to a linear oscillating motor and an electric cleaning device. Background Technology

[0002] Existing electric toothbrushes use linear motors with single coils. Single-coil linear motors have high load current, resulting in relatively weak power and poor cleaning performance. Utility Model Content

[0003] In view of this, the present invention provides a linear oscillating motor and an electric cleaning device to solve one of the problems in the background art.

[0004] To achieve one, some, or all of the above objectives, or other objectives, this utility model proposes a linear oscillating motor, comprising:

[0005] case,

[0006] A permanent magnet assembly comprising at least two permanent magnets spaced apart on the housing, and the permanent magnet assembly being a stator;

[0007] An armature, wherein two sets of coils connected in series are arranged axially on the iron core of the armature, and both ends of the iron core are connected to the housing by leaf springs and located above the permanent magnet assembly; the armature is a mover.

[0008] The gap between the permanent magnet and the armature core comb teeth is set between 0.1 and 0.8 mm.

[0009] Furthermore, the linear oscillating motor also includes:

[0010] An auxiliary module is formed by connecting the two ends of a counterweight to the housing via leaf springs.

[0011] Furthermore, the armature core body is formed by a mixture of 4-tooth comb-shaped iron sheets and 6-tooth comb-shaped iron sheets stacked together, with two sets of coils wound around the central 2 teeth; wherein the iron sheet used to connect the leaf spring is 6-tooth comb-shaped, and the two teeth on both sides are shorter, and at least part of the two teeth on both sides are provided with connecting ears on the outside.

[0012] Furthermore, the second and fifth teeth of the 6-tooth comb-shaped iron sheet have a tooth width equal to half the width of the middle two teeth.

[0013] Furthermore, the outer edges of the teeth adjacent to the two teeth on both sides of the 6-tooth comb-shaped iron sheet are inclined inward by 15-30 degrees.

[0014] Furthermore, the permanent magnet assembly consists of three permanent magnets spaced apart on the housing. In the initial position, the first magnet is located between the first and second teeth of the 4-tooth comb-shaped iron sheet, the second magnet is located between the second and third teeth of the 4-tooth comb-shaped iron sheet, and the third magnet is located between the third and fourth teeth of the 4-tooth comb-shaped iron sheet.

[0015] Furthermore, the overall shape of the 4-tooth comb-shaped iron sheet is an inverted trapezoid; the 6-tooth comb-shaped iron sheet is formed by extending one tooth outward from each side of the 4-tooth comb-shaped iron sheet.

[0016] Furthermore, an iron plate assembly is provided on the back of the permanent magnet assembly, and the iron plate assembly is fixed to the housing.

[0017] Furthermore, the height ratio of the outer two teeth and the middle four teeth of the 6-tooth comb-shaped iron sheet is between 1:2 and 1:3.

[0018] Furthermore, the leaf spring has a center end and an outer end, and spirals from the center end at least one turn to the outer end. The outer end has two external connecting ends that form an angle of 80-100 degrees with the center. When the leaf spring is connected to the housing, the two external connecting ends are respectively connected to the bottom wall and the side wall of the housing.

[0019] Furthermore, the housing is groove-shaped, with a through hole at the front end for the drive shaft to pass through the connecting leaf spring.

[0020] To achieve one or more of the above objectives or other objectives, this utility model also proposes an electric cleaning device, which has a linear oscillating motor as described in any of the above claims.

[0021] Implementing the embodiments of this utility model will have the following beneficial effects:

[0022] After adopting the above-mentioned linear oscillating motor, since two sets of coils connected in series are arranged on the iron core of the armature along the axial direction, compared with a single coil, under the same power supply, i.e. the same battery, the coil resistance increases and the current decreases, while the output power remains unchanged, the power consumption is reduced, and the range is improved; under the condition of keeping the current the same, since the armature is a double coil, the output power is improved and the cleaning power is improved. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] in:

[0025] Figure 1 This is a schematic diagram of the structure of a linear oscillating motor in one embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the armature and auxiliary module in one embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the installation structure of the permanent magnet assembly in one embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the leaf spring in one embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of a 4-tooth comb-shaped iron sheet in one embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of a 6-tooth comb-shaped iron sheet in one embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the 6-tooth comb-shaped iron sheet in another embodiment of the present invention;

[0032] Figure 8 This is a cross-sectional view of the linear oscillating motor in one embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the installation structure of the iron sheet assembly in one embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the linear oscillating motor in another embodiment of the present invention;

[0035] Figure 11 for Figure 10 Another perspective.

[0036] Reference numerals: 1. Housing; 2. Permanent magnet assembly; 3. Armature; 31. Iron core; 311. 4-tooth comb-shaped iron sheet; 312. 6-tooth comb-shaped iron sheet; 3121. Connecting lug; 32. Coil; 4. Leaf spring; 41. Center end; 42. Outer end; 421. External connecting end; 5. Auxiliary module; 6. Drive shaft; 7. Iron sheet assembly. Detailed Implementation

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0040] Reference Figures 1 to 9 In some embodiments, the present invention provides a linear oscillating motor, comprising: a housing 1; a permanent magnet assembly 2, wherein the permanent magnet assembly 2 consists of at least two permanent magnets spaced apart on the housing 1, and the permanent magnet assembly 2 is a stator; an armature 3, wherein two sets of coils 32 connected in series are arranged axially on the iron core 31 of the armature 3, and both ends of the iron core 31 are connected to the housing 1 by leaf springs 4 and are located above the permanent magnet assembly 2, and the armature 3 is a mover; the gap between the permanent magnets and the comb teeth of the armature core is set between 0.1-0.8 mm.

[0041] In this embodiment, the housing 1 can be a groove-shaped housing 1 with some snap-fit ​​structures at the bottom for snapping the permanent magnet, or it can be directly glued or fixed in other existing common ways. The aforementioned axial direction refers to the direction of movement of the mover during operation, that is, the length direction of the drive shaft 6. The fact that two sets of coils 32 are arranged axially on the iron core 31 of the armature 3 means that two sets of coils 32 are arranged on the iron core 31 of the armature 3, and these two sets of coils 32 are arranged sequentially in the axial direction, such as... Figure 2 and Figure 8As shown. Since the armature 3 of this linear oscillating motor acts as the mover and the permanent magnet acts as the stator, the permanent magnet can be directly mounted on the housing 1. Compared to existing linear oscillating motors, there is no need for an oscillation structure to support the permanent magnet, thus the overall volume can be made smaller. The aforementioned leaf spring can be a single leaf spring or multiple leaf springs stacked together. In addition, since the armature 3 acts as the mover, the two ends of the iron core 31 of the armature 3 need to be provided with extending structures to connect the leaf spring 4. If the connecting shaft is directly extended on the iron core 31 of the armature 3, the magnetic field formed by the coil 32 will be dispersed towards the connecting shaft, weakening the magnetic force of the magnetic field formed by the coil 32 on the permanent magnet, resulting in poor performance and poor battery life. However, in this embodiment, by setting two sets of coils 32, even if the connecting shaft is directly extended on the iron core 31 of the armature 3, the adjacent parts of the two sets of coils 32 are not weakened, and the degree of magnetic force weakening is greatly improved, which can better solve the aforementioned problem of poor battery life.

[0042] It is worth mentioning that, under the same power supply, when two coils are connected in series, the current is halved compared to a single coil, but the total magnetomotive force (IN) remains unchanged, therefore the electromagnetic force is the same as with a single coil. The following is a more detailed explanation:

[0043] 1. For a single coil:

[0044] Load current: ;

[0045] Electromagnetic force:

[0046] 2. For two coils connected in series:

[0047] Total resistance: ;

[0048] Load current (current halved): ;

[0049] Total electromotive force (IN constant): ;

[0050] Electromagnetic force (same as single coil):

[0051] in,

[0052] Resistivity;

[0053] This refers to the width of the winding.

[0054] Voltage;

[0055] The outer diameter of the winding;

[0056] The inner diameter of the winding;

[0057] The diameter of the enameled wire;

[0058] As can be seen from the above calculations, under the same voltage, the load current is half that of a single coil when using two series-connected coils, while the electromagnetic force is the same. Therefore, under the same power supply, the resistance of the two series-connected coils increases and the current decreases, while the output power remains unchanged, resulting in reduced power consumption and improved range. Furthermore, while maintaining the same current, the output power and cleaning efficiency are improved due to the dual-coil armature.

[0059] In some embodiments, the linear oscillating motor further includes:

[0060] Auxiliary module 5 is formed by connecting the two ends of the counterweight to the housing 1 via leaf springs 4.

[0061] In this embodiment, the overall structure and arrangement of the auxiliary module 5 are similar to those of the armature 3, except that the auxiliary module 5 does not have a coil 32. Figure 1 , 2 As shown in Figure 8, the auxiliary module 5 functions to reduce the impact of the linear oscillation motor on the vibration of the housing through resonance, thereby improving the user experience. Preferably, the mass of the counterweight and the mass of the armature 3 should be as close as possible.

[0062] In some embodiments, the main body of the armature 3 core 31 is formed by a mixture of stacked 4-tooth comb-shaped iron sheets 311 and 6-tooth comb-shaped iron sheets 312, and two sets of coils 32 are wound on the central 2 teeth; wherein the iron sheet used to connect the leaf spring 4 is 6-tooth comb-shaped, and the two teeth on both sides are shorter, and at least part of the two teeth on both sides are provided with connecting lugs 3121 on the outside.

[0063] In this embodiment, two sets of coils 32 are wound around the central two teeth, specifically as shown in the figure. Figure 2 and Figure 8 As shown. As mentioned above, placing a connecting shaft on the iron core 31 of the armature 3 will affect the magnetic field generated by the coil 32 to some extent. In this embodiment, it is formed by a mixture of 4-tooth comb-shaped iron sheets 311 and 6-tooth comb-shaped iron sheets 312, as shown. Figure 2 As shown, compared to the structure formed entirely of stacked 6-tooth comb-shaped iron sheets 312, the connecting shaft is smaller, thus reducing the aforementioned magnetic field influence.

[0064] In some embodiments, the second and fifth teeth of the 6-tooth comb-shaped iron sheet have a tooth width equal to half the width of the middle two teeth.

[0065] In some embodiments, the outer edges of the teeth adjacent to the two teeth on both sides of the 6-tooth comb-shaped iron sheet 312 are inclined inward by 15-30 degrees.

[0066] In this embodiment, the outer edges of the teeth adjacent to the two teeth on both sides of the 6-tooth comb-shaped iron sheet 312 are inclined inward at 15-30 degrees. Compared with directly extending the connecting shaft on the iron core 31 of the armature 3, this method makes the main body of the armature 3 far away from the connecting shaft, and the degree of weakening of the magnetic field generated by the connecting shaft on the coil 32 is significantly reduced. If applied to an electric toothbrush, it can effectively improve the battery life.

[0067] In some embodiments, the permanent magnet assembly 2 comprises three permanent magnets spaced apart on the housing. In the initial position, the first magnet is located between the first and second teeth of the four-tooth comb-shaped iron sheet 311, the second magnet is located between the second and third teeth of the four-tooth comb-shaped iron sheet 311, and the third magnet is located between the third and fourth teeth of the four-tooth comb-shaped iron sheet 311. Additionally, an iron sheet assembly 7 is provided on the back of the permanent magnet assembly, such as... Figure 10 As shown, the iron sheet assembly 7 is directly fixed to the housing. The iron sheet assembly 7 can reduce magnetic leakage.

[0068] In this embodiment, refer to Figure 8The permanent magnet assembly 2 consists of three permanent magnets spaced apart on the housing. In the initial position, the first magnet is located between the first and second teeth of the 4-tooth comb-shaped iron sheet 311, the second magnet is located between the second and third teeth of the 4-tooth comb-shaped iron sheet 311, and the third magnet is located between the third and fourth teeth of the 4-tooth comb-shaped iron sheet 311. Coil windings are provided on the second and third teeth. The winding method of these coils causes the ends of the first, second, third, and fourth teeth to generate virtual magnetic poles with alternating N and S poles. For example, the ends of the first, second, third, and fourth teeth can sequentially form N, S, N, S poles or S, N, S, N poles. When AC current is applied to this linear high-frequency oscillator, the end faces of both sets of coil winding modules facing the permanent magnets alternately form N... The changes between level A and level S, based on the principle that like poles repel and unlike poles attract in magnetic fields, will cause attraction and repulsion between the permanent magnet and both sets of coil winding modules (for example, when the like poles of two magnets approach each other, due to the mutual repulsion of the magnetic fields, the two like-pole magnets seem to be separated by a force, while the two unlike-pole magnets will attract each other). This causes the two sets of coil winding modules to simultaneously apply essentially the same repulsive or attractive force to both sides of the moving module along the width direction of the casing, enhancing the magnetoelectric reaction and balancing the forces on the moving module along the width direction of the casing, preventing the moving module from shifting along the width direction of the casing, ensuring structural stability, and achieving [something] within a limited [range]. In this design, increasing the motor impedance of the linear high-frequency oscillator reduces its operating current, thereby lowering its power consumption. This extends the battery life without increasing battery capacity. Furthermore, the deformation and elastic restoring force of the two leaf spring assemblies ensure axial reciprocating oscillation output while minimizing oscillation losses along the width of the housing. This reduces unnecessary power consumption while maintaining stable axial reciprocating oscillation output, improving the battery life of products equipped with this linear high-frequency oscillator and enhancing the user experience.

[0069] In some embodiments, the 4-tooth comb-shaped iron sheet 311 has an overall inverted trapezoidal shape, and the 6-tooth comb-shaped iron sheet 312 is formed by extending the 4-tooth comb-shaped iron sheet 311 outward and connecting one tooth.

[0070] In some embodiments, the height ratio of the outer two teeth and the middle four teeth of the 6-tooth comb-shaped iron sheet 312 is between 1:2 and 1:3.

[0071] In this embodiment, a leaf spring 4 is connected to two teeth on the side of the 6-tooth comb-shaped iron sheet 312. When applied to an electric toothbrush, the drive shaft 6 of the electric toothbrush is the center end 41 of the leaf spring 4. Figure 10 or Figure 11The height ratio of the outer two teeth and the middle four teeth of the 6-tooth comb-shaped iron plate 312 is between 1:2 and 1:3. This ratio has at least several advantages. One is that with this ratio, the drive shaft 6 is closest to or essentially at the center of the armature 3. Since the thickness of the permanent magnet is very small relative to the armature 3, the drive shaft 6 being close to the center of the armature 3 is close to the center of the linear oscillating motor. When this ratio is applied to electric cleaning devices such as electric toothbrushes, the linear oscillating motor is located at the center of the toothbrush housing 1, and the drive shaft 6 is close to the central axis of the toothbrush. The overall proportions are more harmonious, the center of gravity is better, reducing the vibration caused by oscillation during product use and improving the user experience.

[0072] In some embodiments, the leaf spring 4 has a center end 41 and an outer end 42, and is spiraled from the center end 41 at least one turn to the outer end 42. The outer end 42 has two external connecting ends 421 forming an angle of 80-100 degrees with the center. When the leaf spring 4 is connected to the housing 1, the external connecting ends 421 are respectively connected to the bottom wall and the side wall of the housing 1.

[0073] In this embodiment, since the armature 3 is connected to the two leaf springs 4 with a center end 41, the arrangement of the two external connection ends 421 of the outer end 42 makes the armature 3 form a 4-pin connection structure with 4 external connection ends 421. If the outer end 42 is only provided with one external connection end 421, the armature 3 will be a 2-pin connection structure, and the stability will be much worse than the above 4-pin connection structure.

[0074] In some embodiments, the housing 1 is groove-shaped, with a through hole at the front end for the drive shaft 6 to pass through the connecting leaf spring 4.

[0075] To achieve one or more of the above objectives or other objectives, this utility model also proposes an electric cleaning device, wherein the electric toothbrush has a linear oscillating motor as described in any of the above claims.

[0076] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A linear oscillating motor, characterized in that, include: case, A permanent magnet assembly comprising at least two permanent magnets spaced apart on the housing, and the permanent magnet assembly being a stator; An armature, wherein two sets of coils connected in series are arranged axially on the iron core of the armature, and both ends of the iron core are connected to the housing by leaf springs and located above the permanent magnet assembly; the armature is a mover. The gap between the permanent magnet and the armature core comb teeth is set between 0.1 and 0.8 mm.

2. The linear oscillating motor according to claim 1, characterized in that, The linear oscillating motor also includes: An auxiliary module is formed by connecting the two ends of a counterweight to the housing via leaf springs.

3. The linear oscillating motor according to claim 1, characterized in that, The armature core is formed by stacking a mixture of 4-tooth comb-shaped iron sheets and 6-tooth comb-shaped iron sheets, with two sets of coils wound around the central 2 teeth; the iron sheet used to connect the leaf spring is 6-tooth comb-shaped, with the two teeth on both sides being shorter, and at least part of the two teeth on both sides having connecting ears on the outside.

4. The linear oscillating motor according to claim 3, characterized in that, The second and fifth teeth of the 6-tooth comb-shaped iron sheet have a tooth width equal to half the width of the middle two teeth.

5. The linear oscillating motor according to claim 3, characterized in that, The permanent magnet assembly consists of three permanent magnets spaced apart on the housing. In the initial position, the first magnet is located between the first and second teeth of the 4-tooth comb-shaped iron sheet, the second magnet is located between the second and third teeth of the 4-tooth comb-shaped iron sheet, and the third magnet is located between the third and fourth teeth of the 4-tooth comb-shaped iron sheet.

6. The linear oscillating motor according to claim 1, characterized in that, The permanent magnet assembly has an iron plate assembly on its back, which is fixed to the housing.

7. The linear oscillating motor according to claim 1, characterized in that, The leaf spring has a center end and an outer end, and spirals from the center end at least one turn to the outer end. The outer end has at least two external connecting ends forming an angle of 80-100 degrees with the center. When the leaf spring is connected to the housing, the at least two external connecting ends are respectively connected to the bottom wall and the side wall of the housing.

8. The linear oscillating motor according to claim 7, characterized in that, The permanent magnet assembly consists of three permanent magnets spaced apart on the housing, and there are two external connection ends.

9. The linear oscillating motor according to claim 1, characterized in that, The housing is groove-shaped, with a through hole at the front end for the drive shaft to pass through the connecting leaf spring.

10. An electric cleaning device, characterized in that, The electric cleaning device has a linear oscillating motor as described in any one of claims 1 to 9.

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