阅读说明：本技术 一种大推力音圈电机 (High-thrust voice coil motor ) 是由 姚国辉 于 2021-10-15 设计创作，主要内容包括：本发明公开了一种大推力音圈电机,其包括基座、转子组件、定子组件以及外壳；所述转子组件包括线轴支架,线轴支架的内侧为摄像头镜头装配腔,外侧设置有线圈,线圈为两组,下线圈轮廓线为等腰梯形,且所述等腰梯形的斜边与水平面之间保持有60～70°的夹角,而上线圈与水平面平行；所述定子组件包括下磁钢、上磁钢以及磁轭,下磁钢和上磁钢分别与下线圈以及上线圈配合并保持同心设置,所述磁轭设置于下磁钢与上磁钢外侧,并在所述磁的环面上等间距设置,并在所述竖向槽内还设置有与所述竖向槽相匹配的条形磁钢。本发明通过改变磁通路能有效提高音圈电机对其内装配的摄像头镜头的推力。(The invention discloses a high-thrust voice coil motor which comprises a base, a rotor assembly, a stator assembly and a shell, wherein the base is provided with a plurality of slots; the rotor assembly comprises a bobbin bracket, wherein a camera lens assembly cavity is formed in the inner side of the bobbin bracket, coils are arranged on the outer side of the bobbin bracket, the number of the coils is two, the outline of the lower coil is isosceles trapezoid, an included angle of 60-70 degrees is kept between the inclined edge of the isosceles trapezoid and the horizontal plane, and the upper coil is parallel to the horizontal plane; stator module includes down magnet steel, last magnet steel and yoke, and lower magnet steel and last magnet steel cooperate and keep concentric setting with lower coil and last coil respectively, the yoke sets up in the magnet steel and last magnet steel outside down, and the equidistant setting on the anchor ring of magnetism, and still be provided with in the vertical inslot with vertical groove phase-match's bar magnet steel. The invention can effectively improve the thrust of the voice coil motor to the camera lens assembled in the voice coil motor by changing the magnetic path.)

1. The high-thrust voice coil motor is characterized by comprising a base, a rotor assembly, a stator assembly and a shell, wherein the rotor assembly is formed on the base;

the rotor assembly comprises a bobbin bracket, the inner side of the bobbin bracket is provided with a camera lens assembly cavity, an assembly unit which is fixedly assembled with a camera lens is arranged in the cavity of the bobbin bracket, the outer side of the bobbin bracket is provided with coils, the coils comprise two groups of coils which are connected in series, an upper coil in the two groups of coils is parallel to a horizontal plane, the camera lens assembly cavity is correspondingly arranged on the inner side of the upper coil, the outline of the lower coil is in an isosceles trapezoid shape, and the oblique side of the isosceles trapezoid faces the camera lens;

stator module includes down magnet steel, last magnet steel and yoke, down the magnet steel correspondence set up in the coil outside down and keep concentric setting with the coil down, go up the magnet steel correspondence set up in the coil outside and keep concentric setting with last coil, and the yoke sets up in the magnet steel and last magnet steel outside down to magnet steel and last magnet steel position are provided with down the magnet steel and go up the annular that the magnet steel carries out contained angle and position holding under corresponding, are in simultaneously still be provided with a plurality of vertical grooves that link up from top to bottom on the yoke, vertical groove is blind groove, sets up in the annular outside, vertical groove is equidistant setting on the anchor ring of yoke, and vertical inslot still be provided with the bar magnet steel that vertical groove matches.

2. The high-thrust voice coil motor according to claim 1, wherein the housing comprises a cylindrical side wall and a top cover which are vertically arranged, the cylindrical side wall and the top cover are made of magnetic shielding materials in a molding mode, and the cylindrical side wall and the top cover are of detachable connection structures.

3. The high-thrust voice coil motor as claimed in claim 2, wherein a plurality of positioning grooves are formed on the annular surface of the outer wall of the cylindrical side wall, the cross section of each positioning groove is rectangular or inverted trapezoidal, and the top cover is provided with a positioning protrusion matched with the positioning groove on the outer edge of the lower surface, so that the detachable connection is realized through the matching of the positioning protrusion and the positioning groove.

4. The high-thrust voice coil motor according to claim 1, wherein a composite paper layer is wrapped outside a magnetic yoke of the stator assembly, and the composite paper layer comprises mica paper as an outer layer and a carbon nanotube film layer or a graphene film layer formed inside the mica paper.

5. The high thrust voice coil motor of claim 1, wherein the upper portion and/or the lower portion of the rotor assembly is provided with an elastic body, the elastic body of the upper portion of the rotor assembly is disposed between the upper portion of the rotor assembly and the housing, and the elastic body of the lower portion of the rotor assembly is disposed between the lower portion of the rotor assembly and the base.

6. The high-thrust voice coil motor according to claim 1, wherein the assembly unit is a threaded assembly unit, and matching threaded surfaces are provided on an inner side of the camera lens assembly cavity and an outer side surface of a lens to be assembled, so as to fix the camera lens in the camera lens assembly cavity on the inner side of the bobbin bracket in a threaded manner.

7. The high thrust voice coil motor according to claim 1, wherein a coil support is further provided on the rotor assembly, and two sets of coils arranged in groups are assembled on the coil support and are adhered to the outer circumferential surface of the bobbin support by means of an adhesive to achieve position fixing.

Technical Field

The invention relates to the field of voice coil motors in motor technology, in particular to a high-thrust voice coil motor.

Background

A Voice Coil Motor (Voice Coil Motor) is a dc driving Motor based on an ampere force principle, which controls the movement of an output member by varying the magnitude of dc current of a Coil in a Motor within a permanent magnetic field. The camera focusing device has the advantages of simple structure, small volume, low noise, high specific thrust, high acceleration (over 20 times of gravity acceleration), high response speed (millisecond level), high transmission precision (micron level), convenience in maintenance and high reliability, and can be assembled in a small gap to avoid the assembly defect of insufficient gap in a transmission link and be used as a solution for realizing camera focusing.

A typical voice coil motor in the prior art generally includes a base, a rotor, a stator, and a housing, where the rotor is disposed on the base and can move up and down relative to the stator under the action of an ampere force generated by cutting a magnetic induction line after the coil is energized in a single direction. The coil frame of the conventional voice coil motor can generate thrust in one direction by using ampere force generated by cutting magnetic induction lines relative to the base, and the elastic body performs structural homing when the thrust generated by electromagnetism is eliminated, so that the rotor inevitably overcomes the elastic force of the elastic body and the self weight of the coil frame to drive the voice coil motor when moving up and down relative to the stator, most of the voice coil motors in the prior art use a single coil structure, which easily causes the situation of insufficient thrust, in this case, the thrust of the voice coil motor needs to be increased, the common processing way is to increase the size of a coil wound on the coil frame or a magnet, the technical path can cause the overall size of the voice coil motor to be increased, and the shell with larger volume can hardly increase the sizes of a permanent magnet and the coil arranged in the yoke, thereby causing the generated ampere force to be weakened, meanwhile, since the conventional voice coil motor mostly uses synthetic resin as a housing, if the size of the coil wound on the bobbin or the magnet is increased, the voice coil motor is more susceptible to impact and/or vibration.

Disclosure of Invention

The present invention provides a high thrust voice coil motor, which can solve the above-mentioned drawbacks in the prior art.

The technical problem solved by the invention is realized by adopting the following technical scheme:

a high-thrust voice coil motor comprises a base, a rotor assembly, a stator assembly and a shell, wherein the rotor assembly is formed on the base, the stator assembly is concentrically sleeved outside the rotor assembly, and the outside and the top surface of the stator assembly are sealed by the shell;

the rotor assembly comprises a bobbin bracket, the inner side of the bobbin bracket is provided with a camera lens assembly cavity, an assembly unit which is fixedly assembled with a camera lens is arranged in the cavity of the bobbin bracket, the outer side of the bobbin bracket is provided with coils, the coils comprise two groups of coils which are connected in series, an upper coil in the two groups of coils is parallel to a horizontal plane, the camera lens assembly cavity is correspondingly arranged on the inner side of the upper coil, the outline of the lower coil is in an isosceles trapezoid shape, and the oblique side of the isosceles trapezoid faces the camera lens;

stator module includes down magnet steel, last magnet steel and yoke, down the magnet steel correspondence set up in the coil outside down and keep concentric setting with the coil down, go up the magnet steel correspondence set up in the coil outside and keep concentric setting with last coil, and the yoke sets up in the magnet steel and last magnet steel outside down to magnet steel and last magnet steel position are provided with down the magnet steel and go up the annular that the magnet steel carries out contained angle and position holding under corresponding, are in simultaneously still be provided with a plurality of vertical grooves that link up from top to bottom on the yoke, vertical groove is blind groove, sets up in the annular outside, vertical groove is equidistant setting on the anchor ring of yoke, and vertical inslot still be provided with the bar magnet steel that vertical groove matches.

By way of further limitation, the housing comprises a cylindrical side wall and a top cover which are vertically arranged, the cylindrical side wall and the top cover are made of magnetic shielding materials in a molding mode, and the cylindrical side wall and the top cover are of a detachable connection structure;

the shaping has a plurality of constant head tanks on the outer wall anchor ring of cylindric lateral wall, the cross-section of constant head tank is the rectangle or falls trapezoidal, and the top cap be provided with in lower surface outer fringe with constant head tank assorted location is protruding to realize dismantling through the protruding cooperation with the constant head tank of location and be connected.

By way of further limitation, the magnetic yoke of the stator assembly is wrapped with a composite paper layer, and the composite paper layer comprises mica paper as an outer layer and a carbon nanotube film layer or a graphene film layer formed on the inner side of the mica paper.

By way of further limitation, the upper portion and/or the lower portion of the rotor assembly is provided with an elastomer, the elastomer of the upper portion of the rotor assembly is disposed between the upper portion of the rotor assembly and the housing, and the elastomer of the lower portion of the rotor assembly is disposed between the lower portion of the rotor assembly and the base.

As a further limitation, the assembling unit is a thread assembling unit, and matched thread surfaces are arranged on the inner side of the camera lens assembling cavity and the outer side surface of the lens to be assembled so as to fix the camera lens in the camera lens assembling cavity on the inner side of the bobbin bracket in a thread screwing mode.

By way of further limitation, the rotor assembly is further provided with a coil support, two groups of coils arranged in groups are assembled on the coil support, and the coil support is adhered to the outer peripheral surface of the bobbin support through an adhesive adhesion mode to achieve position fixing.

Has the advantages that: the invention discloses a high-thrust voice coil motor, which is characterized in that two groups of coils and magnetic steel which are concentrically arranged in a rotor assembly and a stator assembly are matched, so that the coils after current is conducted generate an interactive magnetic field, and a magnetic field strengthening area is generated on the inner side of a bobbin bracket of the rotor assembly by the principle that homopolarity mutual repulsion and heteropolarity mutual attraction, the magnetic field strength in the magnetic field strengthening area is effectively improved, the coils in the rotor assembly can generate stronger acting force by matching with a plurality of strip-shaped magnetic steels which are annularly arranged in a vertical groove for secondary strengthening, the thrust force received by the rotor assembly and generated by electromagnetic induction is improved under the condition that the number of windings in the coils is not changed, and the application range of the voice coil motor is expanded under the condition that the outer diameter is not increased.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Wherein: 1. a top cover; 2. an upper elastic body; 3. a spool support; 4. a camera lens; 5. a cylindrical side wall; 6. a magnetic yoke; 7. a strip-shaped magnetic steel; 8. magnetic steel is arranged; 9. an upper coil; 10. assembling thread surfaces; 11. a lower coil; 12. a lower magnetic steel; 13. a lower elastomer; 14. a base.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

It should be noted that if directional indications (such as according to the upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship, movement, etc. of the components in a specific posture (according to the figure), and if the specific posture is changed, the directional indications are changed accordingly.

In the following examples, it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Referring to fig. 1, in this embodiment, the high thrust voice coil motor includes a base 14 and a housing on the outer side, the base 14 and the housing are made of magnetic shielding material, the base 14 is located at the bottom, the housing includes a cylindrical sidewall 5 disposed on the outer side and a top cover 1 disposed on the top surface, the cylindrical sidewall 5 is a vertically disposed cylindrical structure, an inner flange is disposed on the upper portion of the cylindrical sidewall, and a concave-convex fastening structure is disposed on the outer edge of the inner flange, the cylindrical sidewall 5 is detachably connected to the top cover 1 through the concave-convex fastening structure on the top surface, the forming method of the technical method is simpler, and the production cost can be controlled.

As another embodiment, in other embodiments, the cylindrical sidewall 5 may be configured as a vertical cylinder, and a plurality of positioning grooves with rectangular or inverted trapezoid cross sections are formed on the annular surface of the outer wall of the cylinder, and a positioning protrusion matching with the positioning groove is disposed on the outer edge of the lower surface of the top cover, so as to achieve detachable connection through the matching of the positioning protrusion and the positioning groove.

The cavity is enclosed by the base 14 and the inner side of the shell, the rotor assembly and the stator assembly are packaged in the cavity, the rotor assembly and the stator assembly are in a concentric sleeving structure, the rotor assembly is arranged on the inner side, the stator assembly is arranged on the outer side, the cross section profile shapes of the rotor assembly and the stator assembly can be polygonal or circular, and in the embodiment, the cross section profile shapes of the rotor assembly and the stator assembly are circular.

The rotor subassembly includes spool support 3, the bottom shaping of this spool support 3 is on base 14, and still be provided with down elastomer 13 between spool support 3 and base 14, spool support 3 is hollow cylinder structure, its upper portion is cylindrical cylinder, and the lower part is the back taper cylinder, the cylindrical cylinder structure inboard in upper portion of spool support 3 is provided with a cavity, be provided with the internal thread face on the inboard lateral wall that this cavity corresponds, this cavity is camera lens assembly chamber, and the camera lens 4 of treating the assembly have with spool support 3 inboard internal thread face assorted external screw thread face, the internal thread face constitutes assembly screw thread face 10 with the external screw thread face and realizes the assembly of camera lens 4 in camera lens assembly chamber. In addition, the upper surface of the bobbin bracket 3 is provided with an upper elastic body 2 which is abutted against the bobbin bracket 3, the upper elastic body 2 and the lower elastic body 13 have elastic restoring force, the return of the camera lens 14 under the non-stress condition can be realized through the matching of the upper elastic body 2 and the lower elastic body 13, and the upper coil 9 and the lower coil 11 obtain thrust through ampere force generated by cutting a magnetic induction line after the coils are electrified in a single direction so as to resist the elastic restoring force and the gravity of the camera lens 4 and a rotor assembly to enable the camera lens 4 to move.

Two sets of coil bracket independent forming about spool support 3's the outside is provided with, two sets of coil bracket correspond respectively and set up on the outer cylinder face of cylindrical column casing and back taper column casing, two sets of coil bracket independent forming, it has the portion of winding all to shape on it, and be circular shape hollow column tube structure for the cross-section in this portion of winding, the winding has the long wire that the surface coating has insulating resin in order to obtain respectively coil 9 and lower coil 11 on the cylinder of portion of winding, wherein, go up coil 9 and form as shown in the figure state parallel with the horizontal plane, and lower coil 11 forms as shown in the figure the state that the outline line is isosceles trapezoid, and the hypotenuse of these isosceles trapezoids is towards camera lens 4. Coil supports corresponding to the upper coil 9 and the lower coil 11 are fixedly sleeved on an upper cylindrical column and a lower inverted cone-shaped column of the bobbin support 3 respectively, and are structurally fixed in an adhesion mode by using epoxy resin as an adhesive.

In this embodiment, the stator assembly is disposed outside the rotor assembly, the main body of the stator assembly is a magnetic yoke 6, and a composite paper layer (not shown) is wrapped outside the magnetic yoke 6, and the composite paper layer includes mica paper as an outer layer and a carbon nanotube film layer or a graphene film layer formed inside the mica paper, and can be used as an auxiliary insulating structure and an auxiliary magnetic shielding structure. An upper set of annular grooves and a lower set of annular grooves are formed on the inner side of the magnetic yoke 6, an upper magnetic steel 8 and a lower magnetic steel 12 are respectively embedded in the upper set of annular grooves and the lower set of annular grooves in a pressure forming mode, the upper magnetic steel 8 is correspondingly arranged on the outer side of the upper coil 9 and is concentric with the upper coil 9, and magnetic induction lines can be cut by electrifying the upper coil 9; and the lower magnetic steel 12 is correspondingly arranged at the outer side of the lower coil 11 and is concentrically arranged with the lower coil 11, so that the magnetic induction lines can be cut by electrifying the lower coil 11. Meanwhile, a plurality of vertical grooves which vertically penetrate through the upper magnetic steel 8 and the lower magnetic steel 12 are formed in the inner side bottom surfaces of the annular grooves, the vertical grooves are blind grooves, the vertical grooves are arranged in the annular direction of the magnetic yoke 6 at equal intervals, and the bar-shaped magnetic steel 7 is embedded in the vertical grooves in a pressure forming mode.

In the embodiment of the invention, the structure arrangement of the upper coil 9 and the upper magnetic steel 8 can obtain the effect similar to that of the voice coil motor in the prior art, but the voice coil motor in the prior art has no magnetic gathering capability, so that the problem of poor magnetic gathering effect exists, the magnetic field intensity of the coil is low, the performance of the motor is poor, and the strip-shaped magnetic steel 7 arranged on the outer side of the upper magnetic steel 8 of the magnetic yoke 6 can solve the problem; in addition, the arrangement of the lower coil 11 and the lower magnetic steel 12 can generate an axial component force in the ampere force generated after the energization, and the component force can effectively ensure the coaxiality of the rotor assembly and the stator assembly under the condition that the thrust generated by the ampere force of the voice coil motor is increased, so as to ensure the position accuracy of the movement of the camera lens 4.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.