Linear motor device

Abstract

A linear motor device is characterized in that the linear motor device comprises an output shaft, a stator assembly, an elastic piece and a rotor assembly, the output shaft is arranged in the first direction, and the stator assembly is fixedly arranged on a shell base; the elastic pieces are arranged on the shell base at intervals in the first direction, the elastic pieces at least have the capacity of conducting elastic deformation in the first direction, and the mover assembly is connected between the elastic pieces and can move in a reciprocating mode in the first direction; the stator assembly and the rotor assembly can interact to drive the output shaft to reciprocate in the first direction. According to the linear motor device, the output shaft and the rotor assembly are arranged on the elastic sheet, so that the structure is simple, the torque can be improved, and the noise can be reduced. The linear motor device is novel in structure and easy to assemble, and the production cost can be reduced. In addition, the linear motor device provided by the utility model is very beneficial to heat dissipation, good in heat dissipation performance, long in service life, very strong in practicability, and suitable for vigorous popularization.

Description

Technical Field

[0001] The utility model relates to a micro motor, in particular to a linear motor device with a simple structure, large torque and easy heat dissipation. Background Art

[0002] Micro motors are widely used in various electric products, such as electric toothbrushes, electric toys, etc. The existing micro motors have a complex structure, which is not conducive to improving the assembly efficiency and reducing the production cost. In addition, the existing micro motors are usually of a closed structure, and their heat dissipation performance is poor. When the micro motor vibrates at a high frequency, if the heat cannot be dissipated in time, it will affect the product performance. Therefore, the heat dissipation performance of the existing micro motors needs to be improved. Content of the Utility Model

[0003] The utility model aims to solve the above problems, and provides a linear motor device with a simple structure, large torque, easy heat dissipation and easy assembly.

[0004] To solve the above problems, the utility model provides a linear motor device, which is characterized in that it includes:

[0005] An output shaft, arranged along a first direction,

[0006] A stator assembly, fixedly arranged on a housing base;

[0007] A shrapnel, arranged on the housing base at intervals along the first direction, and the shrapnel at least has the ability to elastically deform in the first direction,

[0008] A mover assembly, connected between the shrapnels and capable of reciprocating along the first direction;

[0009] The stator assembly and the mover assembly can interact with each other to drive the output shaft to reciprocate along the first direction.

[0010] Further, the shrapnels are distributed on both sides of the stator assembly along the first direction.

[0011] Further, the mover assembly includes:

[0012] A mover iron core, with both ends respectively connected to the shrapnels;

[0013] A plurality of magnets, arranged on the mover iron core at intervals along the first direction and facing the mover assembly with a gap therebetween.

[0014] Further, the mover iron core includes a main body portion, connecting arm portions, and positioning portions. The connecting arm portions are symmetrically disposed at both end portions of the main body portion along a first direction, and the positioning portions protrude from the connecting arm portions. Positioning holes matching the positioning portions are respectively provided on the elastic pieces, and the positioning portions of the mover iron core are clamped at the positioning holes to be connected between the elastic pieces.

[0015] Further, the connecting arm portions are inclined relative to the first direction, and extend obliquely from the end portions of the main body portion toward the stator assembly. A fitting plane that fits the elastic piece is provided at one end of the connecting arm portion opposite to the main body portion, and the positioning portion protrudes from the fitting plane.

[0016] Further, a plurality of magnet grooves are provided on the main body portion, the magnets are fixedly embedded in the magnet grooves, and two adjacent magnets along the first direction face the stator assembly with opposite magnetic poles.

[0017] Further, the stator assembly includes:

[0018] A stator iron core, fixedly provided on the housing base; the stator iron core is provided with a magnetic shoe portion facing the mover iron core; the magnetic shoe portion is perpendicular to the first direction;

[0019] A coil, sleeved on the magnetic shoe portion.

[0020] Further, the elastic piece is in a spiral scroll shape in a plane perpendicular to the first direction. A part of the outer edge of the elastic piece is connected to the housing base, and the inner end portion of the elastic piece is connected to the output shaft and the mover assembly.

[0021] Further, a first clamping portion and a second clamping portion are provided on the outer edge of the elastic piece. The first clamping portion extends along a second direction, and the second clamping portion extends along a third direction; the second direction and the third direction are perpendicular to each other and are respectively perpendicular to the first direction. A first bayonet and a second bayonet are provided on the housing base. The first clamping portion is clamped at the first bayonet, and the second clamping portion is clamped at the second bayonet.

[0022] Further, the housing base is in an open shape and includes a first plate portion and a second plate portion. The first plate portion and the second plate portion are connected in a bent shape. Heat dissipation holes are provided on the first plate portion, and a third bayonet is provided outside the heat dissipation holes. A protruding third clamping portion is provided at one end of the stator assembly opposite to the mover assembly. The third clamping portion is clamped at the third bayonet so that the heat dissipation holes correspond to the stator assembly.

[0023] The beneficial contribution of the utility model is that it effectively solves the above problems. The linear motor device of the utility model sets the output shaft and the mover assembly on the spring sheet, which is not only simple in structure, but also conducive to increasing torque and reducing noise. The linear motor device of the utility model has a novel structure, is easy to assemble and can reduce production costs. In addition, the linear motor device of the utility model is very conducive to heat dissipation, has good heat dissipation performance and a long service life. It has strong practicality and should be vigorously promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0025] Figure 2 It is a schematic diagram of the structural decomposition of the utility model.

[0026] Figure 3 It is a structural schematic diagram of the utility model.

[0027] Figure 4 It is a schematic diagram of the structural decomposition of the utility model.

[0028] Figure 5 It is a structural sectional view of the utility model.

[0029] Figure symbols: output shaft 10, stator assembly 20, stator core 21, magnetic shoe portion 211, connecting portion 212, third clamping portion 213, coil 22, coil frame 23, cylinder 231, baffle portion 232, spring piece 30, inner ring 31, outer ring 32, first clamping portion 33, second clamping portion 34, shaft hole 35, positioning hole 36, mover assembly 40, mover core 41, main body 411, magnet slot 4111, connecting arm portion 412, positioning portion 413, tip 4131, notch 4132, fitting plane 414, magnet 42, shell seat 50, first clamping port 51, second clamping port 52, first plate portion 53, second plate portion 54, third clamping port 55, heat dissipation hole 56. DETAILED DESCRIPTION

[0030] The following embodiments are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0031] like Figures 1 to 5As shown in the figure, the linear motor device of the present utility model includes an output shaft 10, a stator assembly 20, a shrapnel 30, a rotor assembly 40, and a housing base 50. Among them, the output shaft 10 is arranged along the first direction and is connected to the shrapnel 30. The stator assembly 20 is fixedly arranged on the housing base 50. The shrapnel 30 is arranged on the housing base 50 at intervals along the first direction, and the shrapnel 30 at least has the ability to elastically deform in the first direction, so as to meet the reciprocating movement of the output shaft 10 in the first direction. The rotor assembly 40 is connected between the shrapnels 30 and can reciprocate along the first direction. The rotor assembly 40 and the rotor assembly 40 can interact with each other to drive the output shaft 10 to reciprocate along the first direction. When powered on, under the interaction of the rotor assembly 40 and the stator assembly 20, the rotor assembly 40 reciprocates along the first direction and drives the output shaft 10 to reciprocate along the first direction.

[0032] Since the rotor assembly 40 and the output shaft 10 are arranged on the shrapnel 30, and the shrapnel 30 has the ability to deform in the first direction, the rotor assembly 40 and the output shaft 10 can perform high-frequency vibration in the first direction. And under the action of the shrapnel 30, the rotor assembly 40 and the output shaft 10 are easy to move in the reverse direction, which is beneficial to improving the torque of the motor device. In addition, the rotor assembly 40 and the output shaft 10 are arranged on the shrapnel 30, and it is not easy to generate noise during reciprocating movement, which is beneficial to reducing the noise of the motor device.

[0033] Further, the shrapnels 30 are distributed on both sides of the stator assembly 20 along the first direction. The shrapnel 30 is in a sheet shape, and the material for making it is not limited. Preferably, a metal shrapnel 30 can be selected.

[0034] Further, the shrapnel 30 is in a spiral coiled shape in a plane perpendicular to the first direction, and a hollow is formed between its inner ring 31 and outer ring 32, so it has the ability of elastic deformation.

[0035] The outer edge of the shrapnel 30 is partially connected to the housing base 50, and the inner end of the shrapnel 30 is connected to the output shaft 10 and the rotor iron core 41, so that the shrapnel 30 is fixed on the housing base 50 and can support the reciprocating movement of the rotor assembly 40 and the output shaft 10 along the first direction.

[0036] Further, a first clamping portion 33 and a second clamping portion 34 are provided on the outer edge of the shrapnel 30.

[0037] The first clamping portion 33 and the second clamping portion 34 are spaced apart. Among them, the first clamping portion 33 extends along the second direction. The second clamping portion 34 extends along the third direction.

[0038] Further, the second direction and the third direction are perpendicular and are respectively perpendicular to the first direction.

[0039] Correspondingly, a first bayonet 51 and a second bayonet 52 are provided on the housing base 50.

[0040] The first clamping portion 33 is clamped at the first bayonet 51, and the second clamping portion 34 is clamped at the second bayonet 52. In this way, by clamping the elastic piece 30 from different sides, the elastic piece 30 can be installed more stably.

[0041] To maximize heat dissipation and ensure the stable installation of the elastic piece 30, the housing base 50 is in an open shape and includes a first plate portion 53 and a second plate portion 54. The first plate portion 53 and the second plate portion 54 are connected in a bent shape. The first plate portion 53 and the second plate portion 54 can be flat or non-flat, and can be specifically set according to needs. Preferably, they can be set as a plane or a quasi-plane shape.

[0042] The first bayonet 51 is provided on the first plate portion 53, and the second bayonet 52 is provided on the second plate portion 54. When the elastic piece 30 is clamped on the housing base 50, the elastic piece 30 is perpendicular or nearly perpendicular to the first plate portion 53 and the second plate portion 54.

[0043] Further, for convenient installation, the second bayonet 52 is provided at the edge position of the second plate portion 54, so that the second bayonet 52 is in an open shape.

[0044] Further, a shaft hole 35 is provided at the center of the inner end of the elastic piece 30, and the end of the output shaft 10 is installed at the shaft hole 35 so that the output shaft 10 is connected to the elastic piece 30. An interference fit is preferably provided between the output shaft 10 and the shaft hole 35, so that the output shaft 10 and the elastic piece 30 can move together in the first direction.

[0045] Further, the mover assembly 40 includes a mover iron core 41 and a plurality of magnets 42.

[0046] Both ends of the mover iron core 41 are respectively connected to the elastic piece 30 and can move in the first direction. The magnets 42 are fixedly installed on the mover iron core 41, are arranged at intervals in the first direction, and face the stator assembly 20 and are spaced from the stator assembly 20.

[0047] The mover iron core 41 and the magnets 42 can move together as a whole.

[0048] Further, the mover iron core 41 includes a main body portion 411, a connecting arm portion 412, and a positioning portion 413.

[0049] The main body 411 is spaced apart from the stator assembly 20 and is fixed with the magnet 42. The main body 411 has any shape and is block-shaped as a whole.

[0050] The connecting arm portions 412 are symmetrically arranged at both ends of the main body portion 411 along the first direction. To make the structure more compact and miniaturized, the connecting arm portions 412 are arranged obliquely relative to the first direction, and are formed by the ends of the main body portion 411 extending obliquely in a direction close to the stator assembly 20.

[0051] In order to facilitate the connection with the spring sheet 30 , a fitting plane 414 is provided at one end of the connecting arm portion 412 opposite to the main body portion 411 . The fitting plane 414 can fit with the spring sheet 30 .

[0052] The positioning portion 413 is protrudingly disposed on the connecting arm portion 412. Specifically, it is protrudingly disposed on the fitting plane 414.

[0053] The spring sheet 30 is provided with a positioning hole 36, and the positioning hole 36 matches the positioning portion 413. The positioning portion 413 of the mover core 41 is clamped at the positioning hole 36 and connected between the spring sheets 30, and is not easily separated along the first direction.

[0054] The shape of the positioning portion 413 can be set as needed. In this embodiment, the positioning portion 413 is provided with relatively spaced-apart pointed portions 4131 , and a notch 4132 which gradually narrows from the outside to the inside is formed between the pointed portions 4131 , so that the positioning portion 413 can be easily inserted into the positioning hole 36 .

[0055] Furthermore, in order to facilitate the installation of the magnet 42, a plurality of magnet slots 4111 are provided on the main body 411. The number of the magnet slots 4111 is related to the number of the magnets 42. The shape of the magnet slots 4111 matches the shape of the magnet 42.

[0056] The magnet 42 is fixedly embedded in the magnet slot 4111. The magnet 42 is a block magnet 42, and in this embodiment, it is a rectangular magnet 42. The magnetic pole distribution of the multiple magnets 42 should meet the following conditions: two magnets 42 adjacent to each other along the first direction face the stator assembly 20 with opposite magnetic poles. In this way, when the current direction of the coil 22 changes, it can interact with different magnets 42 to drive the magnet 42 to move, thereby driving the entire mover assembly 40 to move back and forth.

[0057] The stator assembly 20 is fixed on the housing seat 50 and is located in a space enclosed by the spring sheet 30 , the mover core 41 and the housing seat 50 . The stator assembly 20 includes a stator core 21 and a coil 22 .

[0058] The stator core 21 is fixedly arranged on the housing base 50 and is provided with a magnetic shoe portion 211 facing the rotor core 41. The magnetic shoe portion 211 is perpendicular to the first direction. The perpendicularity includes 90° perpendicularity and nearly 90° perpendicularity. The number of the magnetic shoe portions 211 can be set as required and there is at least one. When there is one magnetic shoe portion 211, it can interact with two magnetic poles to drive the movement of the rotor assembly 40.

[0059] In this embodiment, the stator core 21 is provided with 4 magnetic shoe portions 211 arranged at intervals along the first direction, and the bottoms of the magnetic shoe portions 211 are connected by a connecting portion 212.

[0060] The coil 22 is sleeved on the magnetic shoe portion 211, and its number can be set according to the number of the magnetic shoe portions 211. In this embodiment, one coil 22 is respectively sleeved on the middle two of the 4 magnetic shoe portions 211, which can reduce the volume and cost under the condition of meeting the power. Of course, one coil 22 can also be respectively arranged on the 4 magnetic shoe portions 211.

[0061] Further, a coil holder 23 is also arranged between the coil 22 and the magnetic shoe portion 211 for insulating and isolating the coil 22 from the magnetic shoe portion 211. Further, the coil holder 23 can also prevent the coil 22 from loosening.

[0062] The coil holder 23 includes a cylindrical barrel portion 231 and baffle portions 232 arranged at both ends of the barrel portion 231. The inner cavity of the barrel portion 231 penetrates through the baffle portions 232. The barrel portion 231 is sleeved on the magnetic shoe portion 211, and the baffle portions 232 are flush with the ends of the magnetic shoe portion 211. The coil 22 is sleeved on the barrel portion 231 and is restricted by the baffle portions 232.

[0063] To fix the stator core 21 on the housing base 50, a protruding third clamping portion 213 is provided at one end of the stator core 21 opposite to the rotor assembly 40. Specifically, a protruding third clamping portion 213 is provided at the bottom of the connecting portion 212.

[0064] Correspondingly, a third bayonet 55 is provided on the first plate portion 53. The third clamping portion 213 is clamped at the third bayonet 55 so that the stator core 21 is fixed to the housing base 50.

[0065] Further, for maximum heat dissipation, heat dissipation holes 56 are provided on the first plate portion 53, and the heat dissipation holes 56 are distributed between the third bayonets 55. When the stator core 21 is clamped on the first plate portion 53, the heat dissipation holes 56 correspond to the stator core 21, thus facilitating heat dissipation.

[0066] Thus, the linear motor device of the present utility model is formed, and its working principle is as follows:

[0067] When the coil 22 is energized, a virtual magnetic pole is generated on the magnetic shoe portion 211. The virtual magnetic pole interacts with the magnet 42 in the mover assembly 40: like poles attract and unlike poles repel, thereby driving the magnet 42 to move in the first direction. When the current in the coil 22 alternates, the polarity of the virtual magnetic pole alternates, thereby driving the magnet 42 to reciprocate. In this way, the mover assembly 40 can be driven to reciprocate in the first direction, and further drive the output shaft 10 to reciprocate in the first direction.

[0068] Although the present utility model has been disclosed through the above embodiments, the scope of the present utility model is not limited thereto. Without departing from the concept of the present utility model, the above components can be replaced by similar or equivalent elements known to those skilled in the art.

Claims

1. A linear motor device, characterized in that: It includes: The output shaft (10) is arranged along a first direction, A stator assembly (20) is fixedly mounted on a housing seat (50); The spring pieces (30) are arranged on the housing seat (50) at intervals along the first direction, and the spring pieces (30) have at least the ability to elastically deform in the first direction. A movable subassembly (40) connected between the spring sheets (30) and capable of reciprocating along the first direction; The stator assembly (20) and the mover assembly (40) can interact with each other to drive the output shaft (10) to reciprocate along a first direction.

2. The linear motor device according to claim 1, characterized in that: The elastic sheets (30) are distributed on both sides of the stator assembly (20) along a first direction.

3. The linear motor device according to claim 2, characterized in that: The mover assembly (40) comprises: A mover iron core (41), both ends of which are respectively connected to the spring pieces (30); A plurality of magnets (42) are arranged on the mover core (41) at intervals along a first direction and face the mover assembly (40) and are spaced apart from the mover assembly (40).

4. The linear motor device according to claim 3, characterized in that: The movable core (41) comprises a main body (411), a connecting arm (412) and a positioning portion (413); the connecting arm (412) is symmetrically arranged at both end portions of the main body (411) along a first direction; and the positioning portion (413) is protrudingly arranged on the connecting arm (412); Positioning holes (36) matching the positioning portions (413) are respectively provided on the spring sheets (30), and the positioning portions (413) of the mover core (41) are clamped in the positioning holes (36) and connected between the spring sheets (30).

5. The linear motor device according to claim 4, characterized in that: The connecting arm portion (412) is inclined relative to the first direction, and extends obliquely from the end of the main body portion (411) toward a direction close to the stator assembly (20); A fitting plane (414) fitted with the spring sheet (30) is provided at one end of the connecting arm portion (412) opposite to the main body portion (411), and the positioning portion (413) is protrudingly provided on the fitting plane (414).

6. The linear motor device according to claim 4, characterized in that: A plurality of magnet slots (4111) are provided on the main body (411), the magnets (42) are fixedly embedded in the magnet slots (4111), and two magnets (42) adjacent to each other along a first direction face the stator assembly (20) with opposite magnetic poles.

7. The linear motor device according to claim 3, characterized in that: The stator assembly (20) comprises: The stator core (21) is fixedly mounted on the housing seat (50); the stator core (21) is provided with a magnetic shoe portion (211) facing the mover core (41); the magnetic shoe portion (211) is perpendicular to the first direction; The coil (22) is sleeved on the magnetic shoe portion (211).

8. The linear motor device according to claim 1, characterized in that: The spring sheet (30) is in a spiral shape on a plane perpendicular to the first direction, the outer edge of the spring sheet (30) is partially connected to the housing seat (50), and the inner end of the spring sheet (30) is connected to the output shaft (10) and the movable subassembly (40).

9. The linear motor device according to claim 8, characterized in that: A first clamping portion (33) and a second clamping portion (34) are provided on the outer edge of the spring sheet (30); the first clamping portion (33) extends along a second direction, and the second clamping portion (34) extends along a third direction; the second direction is perpendicular to the third direction, and is also perpendicular to the first direction; A first bayonet (51) and a second bayonet (52) are provided on the shell base (50); the first bayonet portion (33) is bayoneted to the first bayonet portion (51), and the second bayonet portion (34) is bayoneted to the second bayonet portion (52).

10. The linear motor device according to claim 9, characterized in that: The housing seat (50) is open and comprises a first plate portion (53) and a second plate portion (54). The first plate portion (53) and the second plate portion (54) are connected in a bent shape. A heat dissipation hole (56) is provided on the first plate portion (53), and a third clamping hole (55) is provided on the outside of the heat dissipation hole (56); A protruding third clamping portion (213) is provided at one end of the stator assembly (20) opposite to the mover assembly (40); the third clamping portion (213) is clamped at the third clamping opening (55) so that the heat dissipation hole (56) corresponds to the stator assembly (20).

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