Linear motor

Abstract

The utility model discloses a linear motor which comprises a shell, a central shaft is axially arranged on the shell, N groups of magnet assemblies are arranged on the central shaft at intervals, N is an even number larger than or equal to 4, magnets are arranged on the magnet assemblies on the two sides of the central shaft respectively, the magnets on the corresponding sides of all the magnet assemblies are arranged in an aligned mode, and the magnets on the corresponding sides of all the magnet assemblies are arranged in an aligned mode. The magnetic poles of the magnets on the corresponding sides of adjacent magnet assemblies are opposite; a coil assembly is arranged outside every two magnet assemblies, and an elastic piece is arranged between the magnet assembly on the outermost side and the shell. Compared with the prior art, the motor has the advantages that the structure is simple and reasonable, the N groups of magnet assemblies are arranged on the central shaft at intervals, and the magnetic poles of the magnets on the corresponding sides of the adjacent magnet assemblies are oppositely arranged, so that a cross magnetic field can be formed in the running process of the motor, and the oscillating force can be improved; and the elasticity of the elastic piece is utilized to play a buffering role, so that the impact feeling of the hand of the user is reduced, and the user experience is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology for electric toothbrushes, specifically a linear motor. Background Technology

[0002] A linear motor (also known as a linear oscillator or linear motor motor) is a transmission device that directly converts electrical energy into linear motion mechanical energy without any intermediate conversion mechanism. Strong oscillations can be achieved through the high-frequency motion of a linear motor. Linear motors are widely used in health products, cleaning products, massage products, and electronic household appliances.

[0003] The basic working principle of a linear motor is that when an electric current is applied, a permanent magnet and an electromagnet interact. When the direction of the current changes, the magnetic poles of the electromagnet also switch between the N pole and the S pole. When this interaction occurs at a high frequency, the motor will move back and forth, thus generating high-frequency oscillations.

[0004] As a core component of electric toothbrushes, the quality and stability of linear motors directly affect the quality of electric toothbrushes. In addition, due to the limited size of electric toothbrushes, it is necessary to develop linear motors that are small in size and can provide stable high-frequency oscillations. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned deficiencies and to disclose to the public a linear motor with a reasonable and compact structure, small size, and stable oscillation.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A linear motor includes a housing, a central shaft axially disposed on the housing, and N sets of magnetic assemblies spaced apart on the central shaft, where N is an even number ≥ 4. Each magnetic assembly has a magnet on each side of the central shaft, with magnets on corresponding sides of all magnetic assemblies aligned and the magnetic poles of corresponding magnets on adjacent magnetic assemblies opposite. A coil assembly is disposed outside every two sets of magnetic assemblies, and elastic elements are disposed between the outermost magnetic assembly and the housing.

[0008] Further optimization measures for this technical solution are as follows:

[0009] As an improvement, the magnet assembly includes an iron core, with protrusions on both sides of the iron core, forming receiving grooves between the protrusions, and the magnets are fixed in the corresponding receiving grooves. This arrangement uses the protrusions to divide the magnets, while the receiving grooves facilitate the installation of the magnets.

[0010] As an improvement, one side of the protrusion is located on the same diameter line as one side of the opposite protrusion, and the magnet is fixed against the side of the protrusion that is located on the same diameter line. This arrangement facilitates positioning, improves assembly efficiency, and ensures that the magnets on corresponding sides of each set of magnet assemblies are aligned.

[0011] As an improvement, the magnet components are spaced at equal intervals. This arrangement is beneficial for the uniformity of the magnetic field.

[0012] As an improvement, the coil assembly includes an insulating support, with a stator core fixed to the center of the insulating support. Winding sections are respectively provided on both sides of the insulating support, and a coil is wound on each of the winding sections. The insulating support facilitates the assembly of the stator core and the coil.

[0013] As an improvement, the stator core is formed by stacking and fixing iron chips.

[0014] As an improvement, the housing includes a housing body and an end cap adapted to the housing body. The housing body has a semi-enclosed structure, and the end cap is fixed to the open end of the housing body.

[0015] As an improvement, a first bearing is provided on the outer shell body at the end away from the end cover. The first bearing is located between the central shaft and the outer shell body, and the outer end of the elastic element abuts against the first bearing.

[0016] As an improvement, a second bearing is provided on the end cap, the second bearing is located between the central shaft and the outer shell body, and a bushing is provided on the inner side of the second bearing, and the outer end of the elastic element abuts against the bushing.

[0017] The advantages of this utility model compared with the prior art are:

[0018] This utility model discloses a linear motor with a simple and reasonable structure. It has N sets of magnet components spaced apart on the central shaft, and the magnetic poles of the corresponding magnets of adjacent magnet components are arranged in opposite directions. This arrangement can form a cross magnetic field during motor operation, which can improve the oscillation force. Elastic elements are respectively provided between the outermost magnet components and the outer shell. The elasticity of the elastic elements plays a buffering role, reducing the impact on the user's hand and improving the user experience. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present utility model;

[0021] Figure 3 yes Figure 2Enlarged view of section A in the middle;

[0022] Figure 4 This is a cross-sectional view of an embodiment of the present invention;

[0023] Figure 5 This is an exploded structural diagram of an embodiment of the present invention (coils are not shown in the diagram).

[0024] Reference numerals: 1. Outer shell; 11. Outer shell body; 12. End cap; 2. Central shaft; 3. Magnet assembly; 31. Magnet; 32. Protrusion; 32a. Receiving groove; 32b. Coil assembly; 4. Insulating support; 41. Winding part; 41a. Stator core; 42. Coil; 43. Elastic element; 5. First bearing; 61. Second bearing; 62. Bushing; 63. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings:

[0026] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0027] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0028] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0029] like Figures 1 to 5As shown, a linear motor includes a housing 1, a central shaft 2 axially mounted on the housing 1, and N sets of magnet assemblies 3 spaced apart on the central shaft 2, where N is an even number ≥ 4. Magnets 31 are respectively arranged on both sides of the central shaft 2 in the magnet assemblies 3, with the magnets 31 on corresponding sides of all magnet assemblies 3 aligned, and the magnetic poles of the magnets 31 on corresponding sides of adjacent magnet assemblies 3 being opposite. A coil assembly 4 is arranged outside every two sets of magnet assemblies 3, and an elastic element 5 is respectively arranged between the outermost magnet assembly 3 and the housing 1.

[0030] The aforementioned magnet 31 is made of neodymium iron boron material.

[0031] In this embodiment, there are 4 sets of magnet components 3, and correspondingly, 2 sets of coil components 4 are provided. Alternatively, there can be 6 sets of magnet components 3, in which case there are 3 sets of coil components 4.

[0032] The magnetic poles of adjacent magnet components 3 on the corresponding side magnets 31 are arranged in opposite directions, such as... Figure 2 As shown, in the first group of magnet components 3 from left to right, the upper magnet 31 is the N pole and the lower magnet 31 is the S pole. In the second group of magnet components 3, the upper magnet 31 is the S pole and the lower magnet 31 is the N pole. In the third group of magnet components 3, the upper magnet 31 is the N pole and the lower magnet 31 is the S pole, and so on. This arrangement causes adjacent magnet components 3 to generate magnetic fields in opposite directions. By utilizing the superposition of magnetic fields, the oscillation force can be increased.

[0033] The magnet assembly 3 includes an iron core 32, with protrusions 32a on both sides of the iron core 32, and a receiving groove 32b formed between the protrusions 32a, and the magnet 31 is fixed in the corresponding receiving groove 32b.

[0034] One side of the protrusion 32a and one side of the opposite protrusion 32a are located on the same diameter line, and the magnet 31 is fixed against the side of the protrusion 32a that is located on the same diameter line. This arrangement allows the magnets 31 at corresponding positions to be aligned.

[0035] The magnet components 3 are arranged at equal intervals. This arrangement ensures a uniform magnetic field distribution, which helps improve the stability of motor operation.

[0036] The coil assembly 4 includes an insulating support 41, a stator core 42 is fixed in the middle of the insulating support 41, and winding portions 41a are respectively provided on both sides of the insulating support 41, with a coil 43 wound on the winding portions 41a.

[0037] The stator core 42 is formed by stacking and fixing iron chips.

[0038] The outer casing 1 includes an outer casing body 11 and an end cap 12 adapted to the outer casing body 11. The outer casing body 11 has a semi-enclosed structure, and the end cap 12 is fixed to the open end of the outer casing body 11.

[0039] A first bearing 61 is provided on the outer shell body 11 at the end away from the end cap 12. The first bearing 61 is located between the central shaft 2 and the outer shell body 11, and the outer end of the elastic member 5 abuts against the first bearing 61.

[0040] The end cap 12 is provided with a second bearing 62, which is located between the central shaft 2 and the outer shell body 11. A bushing 63 is abutted on the inner side of the second bearing 62, and the outer end of the elastic member 5 abuts and cooperates with the bushing 63.

[0041] The elastic element 5 mentioned above is preferably a spring.

[0042] The arrangement of the first bearing 61 and the second bearing 62 can reduce the friction force when the central shaft 2 moves, reduce resistance, and reduce operating noise; while the arrangement of the elastic element 5 on the outside of the magnet assembly 3 on the central shaft 2 can provide buffering force during motor operation by utilizing the elastic force of the elastic element 5, reducing the impact on the user's hand and improving the user experience.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the content of the present utility model specification should be included within the protection scope of the present utility model.

Claims

1. A linear motor comprising a housing (1) on which a central shaft (2) is axially disposed, characterized in that: N sets of magnet components (3) are spaced apart on the central shaft (2), where N is an even number ≥ 4. Magnets (31) are respectively arranged on both sides of the central shaft (2). The magnets (31) on the corresponding sides of all magnet components (3) are aligned. The magnetic poles of the magnets (31) on the corresponding sides of adjacent magnet components (3) are opposite. A coil assembly (4) is arranged outside every two sets of magnet components (3). Elastic elements (5) are respectively arranged between the outermost magnet component (3) and the outer shell (1).

2. A linear motor according to claim 1, characterized in that: The magnet assembly (3) includes an iron core (32), with protrusions (32a) on both sides of the iron core (32) and receiving grooves (32b) formed between the protrusions (32a). The magnet (31) is fixed in the corresponding receiving groove (32b).

3. A linear motor according to claim 2, characterized in that: The side of the protrusion (32a) and one of the sides of the opposite protrusion (32a) are located on the same diameter line, and the magnet (31) is fixed against the side of the protrusion (32a) located on the same diameter line.

4. A linear motor according to claim 3, characterized in that: The magnet components (3) are arranged at equal intervals.

5. A linear motor according to claim 4, characterized in that: The coil assembly (4) includes an insulating support (41), a stator core (42) is fixed in the middle of the insulating support (41), and a winding part (41a) is provided on both sides of the insulating support (41), and a coil (43) is wound on the winding part (41a).

6. A linear motor according to claim 5, characterized in that: The stator core (42) is formed by stacking and fixing iron chips.

7. A linear motor according to any one of claims 1 to 6, characterized in that: The outer shell (1) includes an outer shell body (11) and an end cap (12) adapted to the outer shell body (11). The outer shell body (11) has a semi-enclosed structure, and the end cap (12) is fixed to the open end of the outer shell body (11).

8. A linear motor according to claim 7, characterized in that: A first bearing (61) is provided on the outer shell body (11) at the end away from the end cap (12). The first bearing (61) is located between the central shaft (2) and the outer shell body (11). The outer end of the elastic member (5) abuts against the first bearing (61).

9. A linear motor according to claim 8, characterized in that: The end cap (12) is provided with a second bearing (62), which is located between the central shaft (2) and the outer shell body (11). A bushing (63) is provided on the inner side of the second bearing (62), and the outer end of the elastic element (5) abuts against the bushing (63).

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