CN115967249A - Voice coil motor with high dynamic response and low thrust fluctuation - Google Patents

Abstract

The invention provides a voice coil motor with high dynamic response and low thrust fluctuation. The stator comprises a stator shell, a stator end cover and magnetic steel, the magnetic steel is installed inside the stator shell, and a through hole is formed in the center of the stator shell and used for installing a linear bearing sleeve. The rotor comprises a coil assembly, a flexible outgoing line and a bearing connecting rod, the bearing connecting rod is installed in the center of the coil assembly and fixed with the end face of the coil assembly, one end of the flexible outgoing line is welded to an enameled wire in the coil assembly and led out from the end face of the coil assembly, and the other end of the flexible outgoing line penetrates through a stator end cover to be connected with the outside. When the motor is electrified with the outside through the flexible outgoing line, the motor rotor is supported by the linear bearing inside the motor to perform linear motion, the motion direction of the rotor and the thrust output by the bearing connecting rod are determined by the direction and the magnitude of current, and the motor has the characteristics of high dynamic response, low thrust fluctuation, high reliability and good processing technology.

Description

Voice coil motor with high dynamic response and low thrust fluctuation

Technical Field

The invention relates to a voice coil motor with high dynamic response and low thrust fluctuation, and belongs to the technical field of motors.

Background

At present, the performance of high-precision valve switching devices is continuously improved, and better requirements are provided for the stability, the responsiveness and the service life of an actuating mechanism. Therefore, a high-performance actuator matched with the valve actuating mechanism is needed to ensure the normal operation of the high-precision valve type switching device. The voice coil motor has the characteristics of simple structure, small volume, good controllability and the like, and is gradually applied to the field of high-precision instruments. The traditional voice coil motor mainly focuses on the high-speed performance of reciprocating linear operation, and has small attention to characteristics such as thrust stability, high reliability and the like of the motor, so that the application of the voice coil motor in the field of high-precision valve switching devices is limited.

A novel voice coil motor with high dynamic response, low thrust fluctuation, high reliability and good processing technology is urgently needed to meet the application requirements of high-precision valve switching devices.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the voice coil motor overcomes the defects of the prior art, provides a voice coil motor with high dynamic response and low thrust fluctuation, and has the characteristics of high dynamic response, low thrust fluctuation, high reliability and good processing technology.

The technical solution of the invention is as follows:

the invention discloses a voice coil motor with high dynamic response and low thrust fluctuation, which comprises a stator 100, a rotor 200 and a linear bearing sleeve assembly 301; the linear bearing sleeve assembly 301 is arranged between the stator 100 and the mover 200 to reduce the friction resistance of the stator and the mover during the movement process;

the stator 100 comprises a stator shell 101, magnetic steel 102 and a stator end cover 103; the stator shell 101 is connected with the stator end cover 103 to form a magnetic steel annular chamber 104, the magnetic steel 102 is installed in the magnetic steel annular chamber 104, and a central through hole 106 is formed in the center of the stator shell 101 and used for installing the linear bearing sleeve assembly 301;

the mover 200 comprises a coil assembly 201, a bearing connecting rod 202, a mover end surface 205 and a flexible outgoing line 210, wherein the bearing connecting rod 202 is installed at the central position of the coil assembly 201 and fixed with the mover end surface 205; the coil assembly 201 comprises an enameled wire 204, one end of a flexible outgoing line 210 is welded to the outgoing end of the enameled wire 204 and led out from a rotor end face 205, and the other end of the flexible outgoing line 210 penetrates through the stator end cover 103 to be connected with the outside; the coil assembly 201 is electrified through the flexible outgoing line 210, the coil assembly 201 generates electromagnetic force under the action of the magnetic steel 102, the bearing connecting rod 202 is driven to perform linear motion under the support of the linear bearing sleeve assembly 301, and the motion direction and the output thrust of the bearing connecting rod 202 are determined by the direction and the magnitude of current in the enameled wire 204.

Further, in the above voice coil motor, the linear bearing housing assembly 301 includes a bearing housing 302 and a holder 303; wherein, the outer surface of the bearing sleeve 302 is fixed on the inner surface of the central through hole 106; the bearing sleeve 302 is in interference fit or clearance fit with the central through hole 106, and the axial length of the bearing sleeve 302 is the same as that of the central through hole 106; cage 303 is mounted between bearing housing 302 and bearing link 202.

Further, in the voice coil motor, the linear bearing bush assembly 301 further includes a plurality of steel balls 304; the retainer 303 is provided with a ball chamber for mounting the steel balls 304, and the steel balls 304 are uniformly distributed in the ball chamber of the retainer 303 along the circumferential direction and the axial direction, so that the steel balls 304 are ensured to rotate freely in the retainer 303; the diameter of the steel ball 304 is larger than the thickness of the side wall of the retainer 303, the inner end surface and the outer end surface of the steel ball 304 respectively extend out of the inner surface and the outer surface of the retainer 303, and the outer end surface of the steel ball 304 is in rolling contact with the inner surface of the bearing sleeve 302; the inner end surface of the steel ball 304 is in rolling contact with the outer surface of the bearing link 202.

Further, in the voice coil motor, a linear bearing installation portion and a magnetic steel installation portion are arranged in the stator shell 101, the linear bearing installation portion is connected with the linear bearing sleeve assembly 301, the stator shell 101 is integrally formed, the magnetic steel installation portion is of a stepped structure along the axial direction, the stepped structure generates different magnetic circuits, and the magnetic circuits are matched with the structure of the magnetic steel 102 to form a variable magnetic density structure.

Further, in the voice coil motor, the magnetic steel 102 includes a plurality of annular magnetic steels, the diameters of outer rings of the annular magnetic steels are different, the diameters of inner rings of the annular magnetic steels are the same, each annular magnetic steel is formed by splicing a plurality of arc-shaped magnetic steels, the annular magnetic steels are sequentially bonded along the axial direction, the axial cross sections of the bonded annular magnetic steels form a step shape, and the step number is greater than or equal to 2; the outer end face of each annular magnetic steel is fixedly bonded with the inner wall of the stator shell 101.

Further, in the voice coil motor, when the number of steps is equal to 2, the axial lengths of the two connected annular magnetic steels are x and y, x: y =0.8 to 1.2.

Further, in the above voice coil motor, the coil assembly 201 further includes a coil bobbin 203; the coil framework 203 is provided with a cylindrical slot, and an enameled wire 204 is uniformly wound in the slot along the circumferential direction and the axial direction; the enameled wire 204 and the coil framework 203 are formed by combined machining, the enameled wire 204 and the coil framework 203 are reinforced by vacuum glue pouring, and the coil framework 203 is made of a non-metal material; the coil assembly 201 has a plurality of through holes at its ends.

Further, in the voice coil motor, the axial length of the coil bobbin 203 is greater than the axial length of the magnetic steel 102; the distance between the outer ring surface of the coil component 201 and the inner ring surface of the magnetic steel 102 is less than or equal to 1mm.

Further, in the voice coil motor, the flexible lead-out wire 210 includes a spiral ring and a linear extension portion, one side of the spiral ring is fixed in the stator end cover 103, the linear extension portion passes through the stator end cover 103 and extends to the outside of the motor, the center of the spiral ring is welded with the enameled wire 204, and during the movement of the mover 200, the axial length of the spiral ring changes along with the linear movement of the mover assembly.

Further, in the voice coil motor, the stator cover 103 is provided with a limiting groove along a circumferential direction for preventing the rotor 200 from deflecting in the circumferential direction during the movement.

The beneficial effects of the invention and the prior art are as follows:

(1) The voice coil motor has compact structure and good processing technology; the stator shell can be used as a magnetic yoke, so that the magnetic field intensity of the magnetic steel is uniform in distribution, a magnetic circuit is smooth, magnetic leakage is reduced as far as possible, and the utilization rate of an air gap magnetic field is maximized;

(2) The bearing at the center of the stator designed by the invention can reduce the friction resistance between the rotor bearing connecting rod and the stator in the movement process, thereby improving the response speed of the voice coil motor.

(3) The linear bearing adopted by the invention can greatly reduce the frictional resistance between the rotor and the stator in the movement process, so that the voice coil motor has high response speed.

(4) The axial length of the spiral ring of the flexible outgoing line in the motor can be changed according to the linear motion of the rotor assembly, so that the spiral structure cannot be damaged, and stable and reliable electrification is ensured.

Drawings

FIG. 1 is an axial cross-sectional view of a voice coil motor of the present invention;

FIG. 2 is a three-dimensional view of the stator of the voice coil motor of the present invention;

FIG. 3 is a view of the stator end cap of the voice coil motor of the present invention;

fig. 4 is a view of a mover of the voice coil motor of the present invention;

figure 5 is a plan view of a flexible lead-out of the present invention;

FIG. 6 is a perspective view of the retaining ring of the present invention;

fig. 7 is a three-dimensional magnetic steel view of the voice coil motor of the present invention.

Detailed Description

In order to make the objects, solutions and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Unless otherwise indicated, terms used herein have the ordinary meaning in the art. Like reference symbols in the various drawings indicate like elements.

For convenience of describing the structural relationship, the extending direction along the bearing link of the voice coil motor is referred to as "axial direction" herein; the direction intersecting the motor bearing link and perpendicular to its direction of extension is referred to as "radial".

As shown in fig. 1, the present invention discloses a voice coil motor with high dynamic response and low thrust fluctuation, which comprises a stator 100, a mover 200 and a linear bearing bush assembly 301; the linear bearing sleeve assembly 301 is arranged between the stator 100 and the mover 200 to reduce the friction resistance of the stator and the mover during the movement process;

the stator 100 comprises a stator shell 101, magnetic steel 102 and a stator end cover 103; the stator shell 101 is connected with the stator end cover 103 to form a magnetic steel annular chamber 104, the magnetic steel 102 is installed in the magnetic steel annular chamber 104, and a central through hole 106 is formed in the center of the stator shell 101 and used for installing the linear bearing sleeve assembly 301; the magnetic steel annular chamber 104 and the central through hole 106 are concentrically arranged, and the central through hole 106 is arranged on the inner side of the magnetic steel annular chamber 104. After the magnetic steel 102 is installed, the magnetic steel annular chamber 104 still has a certain space, which is a movement space of the mover 200.

The mover 200 comprises a coil assembly 201, a bearing connecting rod 202, a mover end surface 205 and a flexible outgoing line 210, wherein the bearing connecting rod 202 is installed at the central position of the coil assembly 201 and fixed with the mover end surface 205; the coil assembly 201 comprises an enameled wire 204, one end of a flexible outgoing line 210 is welded to the outgoing end of the enameled wire 204 and led out from a stator end face 205, and the other end of the flexible outgoing line 210 penetrates through the stator end cover 103 to be connected with the outside; the coil assembly 201 is electrified through the flexible outgoing line 210, the coil assembly 201 generates electromagnetic force under the action of the magnetic steel 102, the bearing connecting rod 202 is driven to perform linear motion under the support of the linear bearing sleeve assembly 301, and the motion direction and the output thrust of the bearing connecting rod 202 are determined by the direction and the magnitude of current in the enameled wire 204.

As shown in fig. 1, the linear bearing bush assembly 301 includes a bearing bush 302 and a cage 303; wherein, the outer surface of the bearing sleeve 302 is fixed on the inner surface of the central through hole 106; the bearing sleeve 302 is in interference fit or clearance fit with the central through hole 106, when in clearance fit, the bearing sleeve 302 and the central through hole 106 are bonded and fixed through epoxy resin glue, the axial length of the bearing sleeve 302 is the same as that of the central through hole 106, and two end parts of the bearing sleeve 302 and the central through hole are respectively aligned; cage 303 is mounted between bearing housing 302 and bearing link 202. The linear bearing sleeve assembly 301 further comprises a plurality of steel balls 304; the retainer 303 is provided with a ball chamber for mounting the steel balls 304, and the steel balls 304 are uniformly distributed in the ball chamber of the retainer 303 along the circumferential direction and the axial direction, so that the steel balls 304 are ensured to rotate freely in the retainer 303; the diameter of the steel ball 304 is larger than the thickness of the side wall of the retainer 303, the inner end surface and the outer end surface of the steel ball 304 respectively extend out of the inner surface and the outer surface of the retainer 303, and the outer end surface of the steel ball 304 is in rolling contact with the inner surface of the bearing sleeve 302; the inner end face of the steel ball 304 is in rolling contact with the outer surface of the bearing link 202. Thus, the plurality of steel balls 304 provide a low-friction rolling bearing between the bearing housing 302 and the bearing link 202, so that the friction force of the bearing link 202 during linear motion is minimized, thereby achieving a rapid response of the motion of the voice coil motor mover 200.

As shown in fig. 2, the central through hole 106 is provided with a limiting hole 107 for preventing the linear bearing bush assembly 301 from sliding out of the stator housing end 105 during the movement of the mover 200. The bearing link 202 of the mover 200 passes through the central through-hole stopper hole 107 during the movement.

As shown in fig. 2, a linear bearing mounting portion and a magnetic steel mounting portion are arranged in the stator shell 101, the linear bearing mounting portion is connected with the linear bearing sleeve assembly 301, the stator shell 101 is integrally formed, the magnetic steel mounting portion is of a step-shaped structure along the axial direction, the step-shaped structure generates different magnetic circuits, and the different magnetic circuits are matched with the structure of the magnetic steel 102 to form a variable magnetic density structure. The stator housing end 105 is provided with a plurality of mounting holes 108 for integrally mounting the voice coil motor to other devices. The radial view of the stator of fig. 2 shows 3 mounting holes 108, which are uniformly arranged in the circumferential direction.

As shown in fig. 1, in order to ensure that the mover 200 can provide low-fluctuation thrust during operation, the magnetic steel 102 is of a stepped structure, and the stepped structure can ensure that the magnetic density in the magnetic steel annular chamber 104 in the stator 100 is not uniform, and the magnetic density at the opening to the right side is larger, so that when the mover 200 operates to the right side of fig. 1, the number of turns of the coil assembly 201 in the magnetic field is smaller, but the air gap magnetic density is larger, whereas the number of turns of the coil assembly 201 in the magnetic field is larger, but the air gap magnetic density is smaller, in general, during the whole reciprocating operation process, the electromagnetic thrust is equal to the product of the equivalent number of turns, the air gap magnetic density, the average circumference of a single coil and the current magnitude, and the product of the four parameters is approximately equal, so that low-fluctuation thrust is achieved.

As shown in fig. 2, the magnetic steel 102 includes a plurality of annular magnetic steels, each of which has a different outer ring diameter and an inner ring diameter, each of which is formed by splicing a plurality of arc-shaped magnetic steels, each of which is sequentially bonded along the axial direction, and the axial cross-sections of the bonded annular magnetic steels form a step shape, and the number of steps is greater than or equal to 2; the outer end face of each annular magnetic steel is fixedly bonded with the inner wall of the stator shell 101. When the number of steps equals 2, the axial length of two annular magnet steels that are connected is x and y, x respectively: y =0.8 to 1.2, as shown in fig. 7. As shown in the radial left view of the stator in fig. 2, in this embodiment, the magnetic steel 102 is formed by splicing 6 mutually independent magnetic steel components along the circumferential direction, and the magnetic steel components are spaced and uniformly distributed along the circumferential direction to finally form the annular magnetic steel 102. The material of magnetic steel 102 is sintered neodymium iron boron, such as N48H. The stator housing 101 is made of a cutting material with excellent magnetic conductivity, such as electrical pure iron DT4C, and after the stator housing 101 is finished, nickel plating is performed to prevent rusting. Therefore, the outer wall of the magnetic steel annular chamber 104, the outer wall of the stator shell end 105 and the outer wall of the central through hole 106 are used as magnetic yokes, so that the magnetic field intensity of the magnetic steel 102 is uniformly distributed, and the magnetic circuit is smooth.

As shown in fig. 4, the coil assembly 201 further includes a bobbin 203; wherein, the coil framework 203 is provided with a cylindrical slot, and enameled wires 204 are uniformly wound in the slot along the circumferential direction and the axial direction; the enameled wire 204 and the coil framework 203 are formed by combined machining, the enameled wire 204 and the coil framework 203 are reinforced by vacuum glue pouring, and the coil framework 203 is made of a non-metal material; the coil assembly 201 has a plurality of through holes at its ends. Therefore, the direction of the current flowing through the coil assembly 201 is substantially perpendicular to the direction of the magnetic field, and an electromagnetic driving force along the axial direction of the bearing link 202 is generated, so that the coil assembly 201 drives the bearing link 202 to move linearly along the axial direction. The enameled wire 204 is a high-temperature resistant QY-grade enameled wire, and the wire diameter is about 0.2-0.3 mm. The enameled wire 204 is fastened on the coil bobbin 203 through dipping paint after winding, and the outer surface of the coil assembly 201 is ensured to be smooth and flat. After the winding of the enameled wire 204 on the bobbin 203 is completed, two outlet ends of the enameled wire 204 extend to the side of the fixing post 208 through the end through hole 206 and the corresponding wire passing groove 207. By applying the adhesive in the wire passing groove 207, the enamel wire 204 can be fixed, preventing the enamel wire 204 from being damaged due to slipping and loosening. In addition, the mover end surface 205 may be provided with 4 end surface through holes 206 to keep the coil bobbin 203 communicated with the inside and the outside, thereby reducing air resistance when the mover 200 moves. The fixing posts 208 are used for mounting flexible lead-out wires 210, and the enameled wires 204 are connected to an external circuit through the flexible lead-out wires 210.

The axial length of the coil framework 203 is greater than that of the magnetic steel 102; the distance between the outer ring surface of the coil block 201 and the inner ring surface of the magnetic steel 102 is less than or equal to 1mm. The bearing link 202 may be made of a stainless steel material and subjected to a nitriding hardening treatment. The surface hardness of the bearing connecting rod 202 after nitriding treatment can reach HV 850-1200, and the surface finish can reach less than Ra0.05 after grinding, so that the friction force between the bearing connecting rod 202 and the bearing sleeve assembly 301 is reduced.

As shown in fig. 5, the flexible outgoing line 210 includes a spiral ring and a linear extension, one side of the spiral ring is fixed in the stator end cover 103, the linear extension passes through the stator end cover 103 and extends to the outside of the motor, the center position of the spiral ring is welded with the enameled wire 204, and during the movement of the mover 200, the axial length of the spiral ring changes along with the linear movement of the mover assembly. The coil assembly 201 of the mover 200 is supplied with current from the outside through the flexible lead lines 210, and the flexible lead lines 210 may be adaptively deformed to accommodate the movement of the mover 200 during the movement of the mover 200 while not affecting the power supply. The flexible outgoing line 210 includes two conductive copper foils 211 and 212, which respectively supply power to two outgoing ends of the enamel wire 204. The conductive copper foils 211 and 212 are positioned between and encapsulated by the front substrate 214 and the bottom substrate 215 to be isolated from the outside. The conductive copper foils 211 and 212, the front substrate 214, and the bottom substrate 215 are all flexible, thereby forming the flexible lead-out 210. In the present embodiment, as shown in fig. 5, the flexible lead-out wire 210 includes a closed spiral ring outer ring 216 having a straight extension 217 at a position of an outer edge thereof, and the conductive copper foils 211 and 212 are led out while extending outward in parallel to each other within the straight extension 217. The flexible outgoing line 210 further includes two spiral rings 213, and the two spiral rings 213 are disposed at equal intervals from each other, prevent short-circuiting, and form a double spiral structure. The flexible lead-out wire 210 has a spiral ring center hole 220 at the center, and two pads 218 at bilaterally symmetrical positions. As shown in fig. 3, 4, 5 and 6, the flexible lead-out wire 210 passes through the fixing post 208 through the spiral ring center hole 220, and is bonded and sleeved on the fixing post 208 through the fixing ring 219 by epoxy resin glue, so as to finally fix the flexible lead-out wire 210 and the mover end surface 205. The outer part of the flexible lead 210, i.e. the spiral ring outer ring 216, is mounted on the proximal end face of the stator cover 103, and the two are fixed by epoxy glue.

As shown in fig. 3, the stator cover 103 is axially installed at an opening side of the stator case 101, and both enclose an inner space of the stator 100 to receive the mover 200. The stator end cover 103 has a cylindrical space with a certain length inside, and further, the boss on the opening side of the stator end cover 103 and the concave table on the opening side of the stator shell 101 are fixed by using epoxy adhesive to ensure that the stator shell 101 and the stator end cover 103 are well sealed. The stator cover 103 is provided with a limiting groove along a circumferential direction for preventing the rotor 200 from deflecting in the circumferential direction during a movement process. In this embodiment, fig. 3 shows a radial view of the stator cover 103, and the inner side of the stator cover 103 has 2 limiting grooves 109 for limiting the circumferential rotational position of the mover 200. And the end surface of the stator end cover 103 is provided with a slotted outlet for leading out the flexible lead wires 210.

As shown in fig. 3 and 4, a part of the coil assembly 201 is disposed radially inside the magnetic steel 102 of the stator 100, and is linearly movable with respect to the stator 100 by an electromagnetic action. The bearing connecting rod 202 extends through the central through hole limiting hole 107 of the central through hole 106, the bearing connecting rod 202 is of a single cantilever structure and is fixed in the center of the end surface 205 of the mover, and the coil assembly 201 and the end surface 205 of the mover are integrally machined and formed, so that the bearing connecting rod 202 moves along with the coil assembly 201; the cantilever side of the bearing link 202 extends outside the voice coil motor for outputting thrust.

As shown in fig. 5, when the external circuit supplies power to the coil assembly 201 via the flexible lead-out wires 210, the mover 200 will move linearly in the axial direction, during which the spiral ring outer ring 216 of the flexible lead-out wires 210 is fixed on the proximal end surface of the stator cover 103, remaining stationary with the stator 100, so as to be stably electrically connected with the external circuit; meanwhile, the conductive copper foils 211 and 212 of the flexible lead-out wires 210 are fixed to the mover end surface 205 and move axially therewith so as to stably maintain electrical connection with the coil assembly 201. Since the two spiral rings 213 of the flexible outgoing line 210 may be elongated or shortened in the axial direction, it is possible to accommodate the relative movement between the stator 100 and the mover 200. Through tests, the flexible outgoing line 210 can bear more than 3000 ten thousand times of reciprocating motion without damage, and can bear circumferential rotation of a certain angle.

As shown in fig. 3, 4 and 5, there is a certain rotational movement due to the mover 200. In order to prevent the lead-out wires 210 from being damaged due to excessive twisting caused by excessive rotation of the mover 200, the mover 200 is limited to rotate only within a certain angle range by two limiting posts 209 disposed on the mover 200 and two limiting grooves 109 in the stator end cover 103. Therefore, during the operation of the voice coil motor, the mover assembly 200 can only rotate between the limit positions in the two limit grooves 109 at most, thereby protecting the lead wires 210.

As described above, the voice coil motor in this embodiment has a special design of structure, so that the motor operates stably in the operating process, the thrust fluctuation is low, and the friction force is extremely low, so that the voice coil motor has a faster response speed. Moreover, by using the flexible lead-out wire, the voice coil motor in the embodiment also has higher reliability and service life.

Exemplary embodiments of the present invention have been described in detail herein with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and changes may be made to the specific embodiments described above, and various features and structures presented in the present invention may be combined in various suitable ways without departing from the spirit of the present invention. The scope of the invention is to be determined by the appended claims and their legal equivalents.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Those skilled in the art will appreciate that the invention may be practiced without these specific details.

Claims (10)

1. The utility model provides a voice coil motor of low thrust fluctuation of high dynamic response which characterized in that: the linear bearing comprises a stator (100), a rotor (200) and a linear bearing sleeve assembly (301); the linear bearing sleeve assembly (301) is arranged between the stator (100) and the rotor (200) and used for reducing the friction resistance in the movement process of the stator and the rotor;

the stator (100) comprises a stator shell (101), magnetic steel (102) and a stator end cover (103); the stator comprises a stator shell (101), a stator end cover (103), magnetic steel annular chambers (104), magnetic steel (102) and a linear bearing sleeve assembly (301), wherein the stator shell (101) is connected with the stator end cover (103) to form the magnetic steel annular chambers (104), the central through hole (106) is formed in the center of the stator shell (101);

the mover (200) comprises a coil assembly (201), a bearing connecting rod (202), a mover end face (205) and a flexible outgoing line (210), wherein the bearing connecting rod (202) is installed in the center of the coil assembly (201) and fixed with the mover end face (205); the coil assembly (201) comprises an enameled wire (204), one end of a flexible outgoing line (210) is welded to the outgoing end of the enameled wire (204) and led out from a rotor end face (205), and the other end of the flexible outgoing line (210) penetrates through a stator end cover (103) to be connected with the outside; the coil assembly (201) is electrified through the flexible outgoing line (210), the coil assembly (201) generates electromagnetic force under the action of the magnetic steel (102), the bearing connecting rod (202) is driven to do linear motion under the support of the linear bearing sleeve assembly (301), and the motion direction and the output thrust of the bearing connecting rod (202) are determined by the direction and the magnitude of current in the enameled wire (204).

2. A high dynamic response low thrust ripple voice coil motor as claimed in claim 1, wherein: the linear bearing bush assembly (301) comprises a bearing bush (302) and a retainer (303); wherein, the outer surface of the bearing sleeve (302) is fixed on the inner surface of the central through hole (106); the bearing sleeve (302) is in interference fit or clearance fit with the central through hole (106), and the axial length of the bearing sleeve (302) is the same as that of the central through hole (106); the retainer (303) is installed between the bearing sleeve (302) and the bearing link (202).

3. A high dynamic response low thrust ripple voice coil motor as claimed in claim 2, wherein: the linear bearing sleeve assembly (301) further comprises a plurality of steel balls (304); the retainer (303) is provided with a ball chamber for mounting the steel balls (304), and the steel balls (304) are uniformly distributed in the ball chamber of the retainer (303) along the circumferential direction and the axial direction, so that the steel balls (304) are ensured to freely rotate in the retainer (303); the diameter of the steel ball (304) is larger than the thickness of the side wall of the retainer (303), the inner end face and the outer end face of the steel ball (304) respectively extend out of the inner surface and the outer surface of the retainer (303), and the outer end face of the steel ball (304) is in rolling contact with the inner surface of the bearing sleeve (302); the inner end face of the steel ball (304) is in rolling contact with the outer surface of the bearing connecting rod (202).

4. A voice coil motor with high dynamic response and low thrust ripple as claimed in claim 1, wherein: be equipped with linear bearing installation position and magnet steel installation position in stator shell (101), linear bearing installation position is connected with linear bearing cover subassembly (301), and stator shell (101) are integrated into one piece machine-shaping, magnet steel installation position is the notch cuttype structure along the axial, the notch cuttype structure produces different magnetic circuits, cooperatees with the structure of magnet steel (102), forms variable magnetic density structure.

5. A high dynamic response low thrust ripple voice coil motor as claimed in claim 1, wherein: the magnetic steel (102) comprises a plurality of annular magnetic steels, the diameters of outer rings of the annular magnetic steels are different, the diameters of inner rings of the annular magnetic steels are the same, each annular magnetic steel is formed by splicing a plurality of arc-shaped magnetic steels, the annular magnetic steels are sequentially bonded along the axial direction, the axial sections of the bonded annular magnetic steels form a step shape, and the step number is more than or equal to 2; the outer end face of each annular magnetic steel is fixedly bonded with the inner wall of the stator shell (101).

6. A voice coil motor with high dynamic response and low thrust ripple as claimed in claim 5, wherein: when the step number equals 2, the axial length of two connected annular magnetic steels is x and y, x respectively: y =0.8 to 1.2.

7. A high dynamic response low thrust ripple voice coil motor as claimed in claim 1, wherein: the coil assembly (201) further comprises a coil former (203); wherein, the coil framework (203) is provided with a cylindrical slot, and an enamelled wire (204) is uniformly wound in the slot along the circumferential direction and the axial direction; the enameled wire (204) and the coil framework (203) are formed in a combined machining mode, the enameled wire (204) and the coil framework (203) are reinforced through vacuum glue filling, and the coil framework (203) is made of a non-metal material; the end part of the coil component (201) is provided with a plurality of through holes.

8. A high dynamic response low thrust ripple voice coil motor as claimed in claim 7, wherein: the axial length of the coil framework (203) is greater than that of the magnetic steel (102); and the distance between the outer ring surface of the coil assembly (201) and the inner ring surface of the magnetic steel (102) is less than or equal to 1mm.

9. A high dynamic response low thrust ripple voice coil motor as claimed in claim 1, wherein: the flexible outgoing line (210) comprises a spiral ring and a linear extending portion, one side of the spiral ring is fixed in the stator end cover (103), the linear extending portion penetrates through the stator end cover (103) and extends to the outer side of the motor, the center of the spiral ring is welded with the enameled wire (204), and in the moving process of the rotor (200), the axial length of the spiral ring changes along with the linear movement of the rotor assembly.

10. A voice coil motor with high dynamic response and low thrust ripple as claimed in claim 1, wherein: the stator end cover (103) is provided with a limiting groove along the circumferential direction and used for preventing the rotor (200) from deflecting in the circumferential direction in the moving process.

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