CN109861486B

CN109861486B - Linear motor

Info

Publication number: CN109861486B
Application number: CN201910003178.4A
Authority: CN
Inventors: 韩林; 万磊; 廖洁
Original assignee: Lotes Guangzhou Co Ltd
Current assignee: Lotes Guangzhou Co Ltd
Priority date: 2019-01-03
Filing date: 2019-01-03
Publication date: 2020-10-30
Anticipated expiration: 2039-01-03
Also published as: CN109861486A

Abstract

The invention discloses a linear motor which is characterized by comprising a rotor and a stator, wherein the rotor comprises a magnetic element, at least one side of the magnetic element is provided with a positioning hole, at least one mass block is arranged at one side of the magnetic element, the mass block is provided with an integrally formed positioning part, and the positioning part enters the positioning hole; a housing accommodating the mover; at least one piece that resets and a coil accept in the casing, the coil is located the magnetic element outside, through to the coil circular telegram make the active cell support hold reset piece is in the casing back and forth repeated vibration, and the location is accurate and make simply.

Description

Linear motor

[ technical field ] A method for producing a semiconductor device

The present invention relates to a linear motor, and more particularly, to a linear motor for use in an electronic device.

[ background of the invention ]

A conventional linear motor includes a vibration unit having a magnet and two metal weights located at opposite sides of the magnet; set up in the coil in the magnet outside, hold the casing of magnet, balancing weight and coil, have the shell fragment between balancing weight and casing, can make the vibration unit vibrate repeatedly in the casing through the effort to coil circular telegram and shell fragment, and usually for guide vibration unit vibrates on the predetermined direction, can set up the axle in addition and pass the relative both sides of magnet, balancing weight and casing and realize fixedly with the casing, make the vibration unit can only follow the direction linear motion that the axle extends. However, the addition of the shaft is equivalent to the addition of an element, and in order to match the shaft, holes need to be further formed in the counterweight block and the shell in addition to the magnet, so that the cost and the production process are increased; simultaneously because the axle passes magnet, hole on balancing weight and the casing, in the vibration process, the axle can with magnet, balancing weight and casing friction, a large amount of noise that not only produces, and after vibration many times, the balancing weight wearing and tearing can produce metal powder on the vibration path of vibration unit and then influence the normal vibration of vibration unit, the casing can make on the casing with the friction of axle the fenestrate diameter grow for the fixed axle, the external diameter of axle diminishes, it is not hard up to have the clearance and produce between axle and the through-hole, the effect that can't play the guide at the in-process axis of vibration unit vibration and can further produce bigger noise, be unfavorable for linear motor normal use.

Therefore, there is a need to design a new linear motor to overcome the above problems.

[ summary of the invention ]

The invention aims to provide a linear motor which reduces the production cost and improves the use stability by arranging a positioning part which is integrally formed on a mass block and is matched with a positioning hole of a magnetic element.

In order to achieve the purpose, the invention adopts the following technical scheme: the linear motor is characterized by comprising a rotor and a stator, wherein the rotor comprises a magnetic element, two opposite sides of the magnetic element are respectively provided with a positioning hole, the two positioning holes are communicated with each other, two mass blocks are arranged on the two opposite sides of the magnetic element, each mass block is provided with a positioning part which is integrally formed, the two positioning parts respectively and correspondingly enter the two positioning holes, and gaps are formed between the two positioning parts; a housing accommodating the mover; at least one piece that resets and a coil are acceptd in the casing, the coil is located the magnetic element outside, through to coil circular telegram make the active cell support hold reset piece is in the casing back and forth repeated vibration.

Further, the magnetic poles of the inner wall surface of the positioning hole are opposite to the magnetic poles on the outermost side in the radial direction of the magnetic element.

Further, reset the piece set up in the quality piece with between the casing, reset piece one end with the casing links to each other, and the other end with the quality piece links to each other.

Furthermore, the number of the resetting pieces is two, and the resetting pieces are symmetrically arranged by taking the magnetic element as a center.

Further, the coil is annular and accommodates the magnetic element and the positioning portion.

Furthermore, the mass block is provided with a main body part, one side of the main body part, which is close to the magnetic element, is provided with an inner side surface, and the positioning part is convexly arranged on the inner side surface and enters the positioning hole.

Further, the coil has an accommodating space, and the main body portion and the positioning portion enter the accommodating space when the mover vibrates.

Further, the length of the positioning portion in the direction in which the positioning portion protrudes is smaller than the length of the main body portion.

Furthermore, the mass block is provided with a positioning part at one side in the front-back direction, the other side of the mass block is provided with an outer side face, and in the vibration process of the rotor, the outer side face is abutted to the reset piece.

Furthermore, at least one buffer piece is arranged between the mass block and the shell, and the buffer piece is contacted with the shell and the mass block in the vibration process of the rotor to realize a buffer effect.

Furthermore, the piece that resets is metal shrapnel, the piece that resets have a basal portion and certainly the relative both sides of basal portion side location portion direction has extended a first fixed arm and a second fixed arm respectively, first fixed arm with the casing is fixed, the second fixed arm with the quality piece is fixed the active cell vibration in-process, the active cell with the basal portion butt.

Further, the first fixing arm is located on one side of the mass block in the left-right direction and located between the mass block and the housing, and the second fixing arm is located on the other side of the mass block in the left-right direction and located between the mass block and the housing.

Furthermore, first fixed arm or the second fixed arm has a connecting portion and certainly connecting portion are towards keeping away from a kink that location portion was buckled, connecting portion with kink superpose the back with the quality piece or the casing is fixed, connecting portion with thickness after the kink superpose is greater than the thickness of basal portion.

Furthermore, the first fixing arm is provided with an extension section extending from the base part to the direction close to the positioning part and a hook part bent and extending from the extension section far away from the positioning part, and the hook part is hung on the shell and exposed out of the shell.

Furthermore, a circuit board is located below the positioning portion, the second fixing arm extends from the base portion to a direction close to the positioning portion, and at least one fixing piece is bent from the extending section to the mass block, and the fixing piece is fixed on the upper surface or/and the lower surface of the mass block.

Compared with the prior art, the positioning part integrally formed with the mass block is arranged, the positioning hole is formed in the magnetic element, the positioning part enters the positioning hole to realize positioning, the positioning is accurate, the manufacturing is simple, and a shaft does not need to be additionally arranged, so that the mass block does not need to be punched, the shell does not need to be punched for fixing the shaft, the production process is reduced, and the cost is saved; meanwhile, the magnetic element and the mass block as the mover can integrally and synchronously vibrate in the vibration process, so that the magnetic element and the mass block cannot generate friction and wear, noise cannot be generated, the mover can still be stably kept on an original vibration path after repeated reciprocating vibration, and the normal use of the linear motor cannot be influenced.

[ description of the drawings ]

Fig. 1 is an exploded perspective view of a linear motor according to a first embodiment of the present invention;

FIG. 2 is an exploded perspective view of a portion of the components of the linear motor of the first embodiment;

FIG. 3 is a perspective view of a first embodiment linear motor;

FIG. 4 is a top view of FIG. 3;

fig. 5 is a perspective sectional view of the linear motor of the first embodiment;

FIG. 6 is a schematic cross-sectional view of a first embodiment linear motor;

FIG. 7 is a sectional view of the linear motor of FIG. 6 taken along the line A-A when vibrated;

fig. 8 is an exploded perspective view of a part of a linear motor according to a second embodiment.

Detailed description of the embodiments reference is made to the accompanying drawings in which:

linear motor 100	Mover A	Magnetic element 1	Positioning hole 11
				Mass block 2	Main body part 21	Inner side 211	Outer side 212
First side 213	Second side 214	Positioning part 22	First groove 23
				Coil 3	Accommodating space 31	Circuit board 4	Housing 5
Base body 51	Bottom wall 511	Side wall 512	Second groove 5121
				Cover 52	Top wall 521	End wall 522	Accommodation space 53
Reset piece 6	Base 61	First fixed arm 62	Extension 621
				First connecting portion 622	First bending part 623	Hook 624	Second fixing arm 63
Extension 631	Second connecting portion 632	Second bent part 633	Fixing plate 634
				Buffer 7

[ detailed description ] embodiments

For a better understanding of the objects, structure, features, and functions of the invention, reference should be made to the drawings and detailed description that follow.

For convenience of explanation, in the present embodiment, the front-back direction (corresponding to the vibration direction) is defined as an X direction, the left-right direction is defined as a Y direction perpendicular to the X direction, and the up-down direction is defined as a Z direction perpendicular to the X direction and the Y direction.

Referring to fig. 1 to 7, a linear motor 100 according to a first embodiment of the present invention includes a mover a (including a magnetic element 11 and two mass blocks 2) vibrating along a vibration direction, a coil 3, a circuit board 4, a housing 5, two restoring elements 6, and two buffering elements 7.

Referring to fig. 1, 2 and 5, the magnetic element 1 is a permanent magnet, in other embodiments, the magnetic element 1 may be a magnet array formed by a plurality of magnets, two opposite ends of the magnetic element 1 in the vibration direction are respectively recessed with a positioning hole 11, the two positioning holes 11 are communicated with each other, in other embodiments, the magnetic element may not be communicated with each other, the permanent magnet is magnetized in the radial direction, so that the magnetic pole on the inner wall surface of the positioning hole 11 is opposite to the magnetic pole on the outer side of the magnetic element 1 in the radial direction, in this embodiment, the magnetic pole on the inner wall surface of the positioning hole 11 is an S pole, and the outermost magnetic pole of the magnetic element 1 in the radial direction is an N pole.

Referring to fig. 1 to 6, the mass blocks 2 are metal pieces, the two mass blocks 2 are symmetrically arranged in the vibration direction with the magnetic element 1 as the center, each mass block 2 has a main body portion 21, the main body portion 21 has an inner side surface 211 arranged close to the magnetic element 1 and an outer side surface 212 arranged far away from the magnetic element 1 along opposite sides of the vibration direction, two first side surfaces 213 connecting the inner side surface 211 and the outer side surface 212 and oppositely arranged in the left-right direction, and two second side surfaces 214 oppositely arranged in the up-down direction. The inner side surface 211 and the magnetic element 1 are fixed by a sticky adhesive, a cylindrical positioning portion 22 is protruded from the inner side surface 211 to the magnetic element 1, the positioning portion 22 enters the positioning hole 11, a gap is formed between the two positioning portions 22 in the vibration direction without contacting, and the length of the positioning portion 22 in the vibration direction, i.e., the protruding direction of the positioning portion 22, is smaller than the length of the main body portion 21. Each of the second side surfaces 214 is recessed with a first groove 23.

Referring to fig. 1, 3 and 6, the coil 3 is annular and is located outside the magnetic element 1 and spaced from the magnetic element 1, and the coil 3 has an accommodating space 31.

Referring to fig. 6, the circuit board 4 is located below the magnetic element 1, the coil 3 and the positioning portion 22, supports the coil 3, is electrically connected to the coil 3, and provides current to the coil 3 to generate a magnetic field.

Referring to fig. 1, 3 and 6, the housing 5 includes a base 51 and a cover 52, the base 51 and the cover 52 together enclose an accommodation space 53 for accommodating the mover a, the coil 3 and the circuit board 4, and a portion of the circuit board 4 protrudes out of the housing 5 for connection with an external power supply or device. The base 51 has a bottom wall 511 and two side walls 512 extending upward from the left and right sides of the bottom wall 511, the bottom wall 511 is provided with a double-sided tape or other adhesive element for fixing the circuit board 4 on the bottom wall 511, and the upper end of each side wall 512 is concavely provided with a second groove 5121. The cover 52 has a top wall 521 and two end walls 522 extending downward from the top wall 521 at opposite sides in the vibration direction.

Referring to fig. 1, 3 to 5, two of the reset members 6 are metal elastic sheets and are accommodated in the accommodating space 53, and are located between the mass block 2 and the end wall 522 to support the mover a for suspending the mover a, each reset member 6 has a base portion 61 extending in the left-right direction, and a first fixed arm 62 and a second fixed arm 63 respectively extending from the left side and the right side of the base portion 61 to the direction close to the positioning portion 22, the first fixed arm 62 has an extending section 621 extending from the base portion 61 to the direction close to the positioning portion 22, one end of the extending section 621 close to the positioning portion 22 has a first connecting portion 622, the first connecting portion 622 is a first bending portion 623 bending away from the positioning portion 22, and the first extending section 621 and the first bending portion 623 are located on one side of the mass block 2 and between the mass block 2 and the side wall 512 in the left-right direction, the thickness of the first connecting portion 622 and the first bending portion 623 after being overlapped is greater than the thickness of the base portion 61, and the first connecting portion 622 and the first bending portion 623 after being overlapped are welded and fixed to the side wall 512, which may be fixed in other manners in other embodiments. The second fixing arm 63 has an extending section 631 extending from the base 61 toward a direction close to the positioning portion 22, one end of the extending section 631 close to the positioning portion 22 has a second connecting portion 632, the second connecting portion 632 is a second bending portion 633 bending toward a direction away from the positioning portion 22, the extending section 631 and the second bending portion 633 are located on the other side of the proof mass 2 in the left-right direction and are located between the proof mass 2 and the side wall 512, the thickness of the second connecting portion 632 and the second bending portion 633 after being overlapped is greater than the thickness of the base 61, and the second connecting portion 632 and the second bending portion 633 after being overlapped are welded and fixed to the first side surface 213, which may be fixed in other embodiments by other methods. The first connecting portion 622 and the second connecting portion 632 form a connecting portion (not numbered), and the first bending portion 623 and the second bending portion 633 form a bending portion (not numbered).

Referring to fig. 6, a buffer 7 is disposed between each of the outer side surfaces 212 and each of the end walls 522, the buffer 7 is fixed on the end walls 522, and in other embodiments, the buffer 7 may be fixed on the outer side surfaces 212, and the buffer 7 may be a sponge or other element made of a soft material.

Referring to fig. 3 to fig. 6, at this time, the mover a is located at an initial position, at which the two mass blocks 2 are symmetrically arranged in the vibration direction with the coil 3 as the center, the two reset members 6 are symmetrically arranged with the coil 3 and the magnetic element 1 as the center, and the center of the magnetic element 1 and the center of the coil 3 are located on the same straight line in the radial direction; it can be seen that, at this time, the accommodating space 31 partially accommodates the magnetic element 1, the main body portion 21 is located outside the accommodating space 31, and the positioning portion 22 is protruded into the accommodating space 31. As shown in fig. 7, when the mover a repeatedly vibrates in the vibration direction due to the magnetic field generated by the coil 3 and the reset member 6, the mover a starts to accelerate from the initial position, the reset member 6 on one side contacts the mover a, the outer side surface 212 abuts against the base portion 61 and contacts the buffer member 7 to buffer the force applied between the mass block 2 and the housing 5, the magnetic field generated by the coil 3 and the reset member 6 on the other side are stretched to elastically deform and decelerate the mover a, when the instantaneous speed of the mover a becomes 0, the deformation amount of the reset member 6 reaches the maximum value, the mover a starts to accelerate in the other direction, and when the mover a moves to the other side, the instantaneous speed also becomes 0 due to the magnetic field generated by the coil 3 and the reset member 6, the mover a will then start accelerating again in the other direction, and so on.

Referring to fig. 8, the second embodiment of the linear motor 100 is different from the first embodiment in the structure of the restoring member 6, the fixing manner of the restoring member 6, the seat body 51, the cover body 52 and the mass block 2. In this embodiment, the reset element 6 has a hook portion 624 extending from the extending portion 621 away from the positioning portion 22 in the left-right direction, the hook portion 624 is hung on the side wall 512 and enters the second groove 5121 to be partially exposed out of the seat body 51, the cover body 52 is mounted on the seat body 51 from the top down, and then the hook portion 624 is welded and fixed with the side wall 512 and the cover body 52. In addition, two fixing plates 634 are bent from the extension section 631 in the left-right direction near the mass block 2, and are respectively disposed in the first grooves 23 on the upper surface and the lower surface of the mass block 2, and the fixing plates 634 and the mass block 2 are fixed by welding.

In summary, the linear motor of the present invention has the following beneficial effects:

1. the positioning part 22 integrally formed with the mass block 2 is arranged, the positioning hole 11 is formed in the magnetic element 1, the positioning part 22 enters the positioning hole 11 to realize positioning, the positioning is accurate, the manufacturing is simple, and no additional shaft is needed, so that the mass block 2 does not need to be punched, the shell 5 does not need to be punched for fixing the shaft, the production process is reduced, and the cost is saved.

2. Since the magnetic element 1 and the mass block 2 as the mover a may vibrate synchronously as a whole in the vibration process, the magnetic element 1 and the mass block 2 may not generate friction and wear, and may not generate noise, and the mover a may still be stably maintained on the original vibration path after repeatedly reciprocating vibration, and may not affect the normal use of the linear motor 100.

3. The two positioning holes 11 are communicated with each other, and the two positioning portions 22 have a gap in the vibration direction without contacting, so that when the mass block 2 is installed, the two positioning portions 22 cannot contact with each other, and one of the mass block 2 cannot be positioned.

4. The length of the positioning portion 22 is smaller than that of the main body portion 21, and the positioning portion 22 can be made of a small amount of material, thereby achieving a sufficient positioning effect and saving material.

5. The outer side surface 212 abuts against the base portion 61 and the buffer 7 during vibration of the mover a, and functions to decelerate the mover a and also to buffer an acting force between the mover a and the case 5.

6. Reset 6 one end with casing 5 links to each other, and the other end with runner A links to each other, guarantees reset 6 is in runner A repeated vibration's in-process can support the runner and smoothly ground elastic deformation.

7. First connecting portion 622 with first kink 623 superpose the back with quality piece 2 welded fastening can increase the intensity of welding department, makes the piece that resets 6 is in the difficult pine of in-process of active cell A vibration takes off.

8. A hook 624 extending from the extension 621 away from the positioning portion 22, wherein the hook 624 is hooked on the housing 5 and exposed outside the housing 5, so that the reset member can be accurately positioned during installation.

9. Two fixing plates 634 are bent from the extension 631 to be close to the mass 2, and the fixing plates 634 are fixed to the upper surface and the lower surface of the mass 2 to enhance the fixing effect between the reset member 6 and the mass 2.

The above detailed description is only for the purpose of illustrating the preferred embodiments of the present invention, and not for the purpose of limiting the scope of the present invention, therefore, all technical changes that can be made by applying the present specification and the drawings are included in the scope of the present invention.

Claims

1. A linear motor, comprising:

the rotor comprises a magnetic element, wherein two opposite sides of the magnetic element are respectively provided with a positioning hole, the two positioning holes are communicated with each other, the two mass blocks are arranged on the two opposite sides of the magnetic element, each mass block is provided with an integrally formed positioning part, the two positioning parts respectively and correspondingly enter the two positioning holes, and gaps are formed between the two positioning parts;

a housing accommodating the mover;

at least one piece that resets and a coil are acceptd in the casing, the coil is located the magnetic element outside, through to coil circular telegram make the active cell support hold reset piece is in the casing back and forth repeated vibration.

2. The linear motor of claim 1, wherein: the magnetic poles of the inner wall surface of the positioning hole are opposite to the magnetic poles on the outermost side in the radial direction of the magnetic element.

3. The linear motor of claim 1, wherein: the reset piece is arranged between the mass block and the shell, one end of the reset piece is connected with the shell, and the other end of the reset piece is connected with the mass block.

4. The linear motor of claim 1, wherein: the number of the resetting pieces is two, and the resetting pieces are symmetrically arranged by taking the magnetic element as a center.

5. The linear motor of claim 1, wherein: the coil is annular and accommodates the magnetic element and the positioning portion.

6. The linear motor of claim 1, wherein: the mass block is provided with a main body part, one side of the main body part, which is close to the magnetic element, is provided with an inner side surface, and the positioning part is convexly arranged on the inner side surface and enters the positioning hole.

7. The linear motor of claim 6, wherein: the coil is provided with an accommodating space, and when the rotor vibrates, the main body part and the positioning part enter the accommodating space.

8. The linear motor of claim 6, wherein: the length of the positioning part in the protruding direction of the positioning part is smaller than that of the main body part.

9. The linear motor of claim 1, wherein: and one side of the mass block in the front-back direction is provided with a positioning part, and the other side of the mass block is provided with an outer side surface which is abutted against the reset piece in the vibration process of the rotor.

10. The linear motor of claim 1, wherein: at least one buffer piece is arranged between the mass block and the shell, and the buffer piece is contacted with the shell and the mass block to realize a buffer effect in the vibration process of the rotor.

11. The linear motor of claim 1, wherein: the reset piece is a metal elastic sheet, the reset piece is provided with a base part and a first fixed arm and a second fixed arm which respectively extend from two opposite sides of the base part to the positioning part, the first fixed arm is fixed with the shell, the second fixed arm is fixed with the mass block, and in the vibration process of the rotor, the rotor is abutted against the base part.

12. The linear motor of claim 11, wherein: the first fixing arm is located on one side of the mass block in the left-right direction and located between the mass block and the shell, and the second fixing arm is located on the other side of the mass block in the left-right direction and located between the mass block and the shell.

13. The linear motor of claim 11, wherein: first fixed arm or the second fixed arm has a connecting portion and certainly connecting portion are towards keeping away from a kink that location portion was buckled, connecting portion with kink superpose the back with the quality piece or the casing is fixed, connecting portion with thickness after the kink superpose is greater than the thickness of basal portion.

14. The linear motor of claim 11, wherein: the first fixing arm is provided with an extension section extending from the base part to the direction close to the positioning part and a hook part bent and extending from the extension section far away from the positioning part, and the hook part is hung on the shell and exposed out of the shell.

15. The linear motor of claim 11, wherein: the second fixing arm extends from the base part to a direction close to the positioning part, and at least one fixing piece is bent from the extending section to the mass block, and the fixing piece is fixed on the upper surface or/and the lower surface of the mass block.