CN116526803A - Voice coil motor based on high dynamic response and low thrust fluctuation - Google Patents

Abstract

The utility model provides a voice coil motor based on high dynamic response and low thrust fluctuation, including stator module, the rotor subassembly, bearing component, the stator module includes the stator shell, the magnet steel, the stator end cover, the rotor subassembly includes the motor rotor, the coil module, the bearing connecting rod, the rotor terminal surface, flexible lead-out wire, bearing component includes linear bearing, linear bearing sleeve subassembly, the magnet steel is installed inside the stator shell, stator shell central point puts and is provided with the linear bearing sleeve subassembly that the center through-hole is used for installing bearing component, the bearing connecting rod is installed in the central point of coil module and is fixed with the rotor terminal surface, flexible lead-out wire one end welds the leading-out terminal of enameled wire in the coil module, and be drawn forth by the rotor terminal surface, flexible lead-out wire other end passes stator end cover and external connection, the motor rotor carries out linear motion through linear bearing support, the direction of motion of motor rotor and the thrust size that the bearing connecting rod output are by the direction in the electric current, the size is decided.

Description

Voice coil motor based on high dynamic response and low thrust fluctuation

Technical Field

The invention relates to a voice coil motor based on high dynamic response and low thrust fluctuation, and belongs to the field of motor structures.

Background

The voice coil motor is a linear motor with advanced performance. The voice coil motor effective part comprises a stator and a rotor, and the working principle is as follows: the rotor is placed in the air gap magnetic field of the stator, electromagnetic force is generated under the action of the magnetic field after the coils in the rotor are electrified, the rotor is pushed by the electromagnetic force to do linear motion, and the speed and the direction of the motion of the rotor can be changed by changing the magnitude and the direction of current.

The voice coil motor is a special type direct current linear motor, has the advantages of high frequency response, high acceleration, small volume, convenient control and the like, and can solve the contradiction problem between precision and speed and stroke due to the advantages. In recent years, with the improvement of performance indexes of an ultra-precise positioning system, the voice coil motor technology is rapidly developed, and the voice coil motor is widely applied to ultra-precise positioning systems such as semiconductor manufacturing equipment, high-grade numerical control machine tools, optical electron microscopes and the like, and is also applied to high-excitation motion systems such as medical treatment, a vibration platform, an active vibration damping system and the like.

In the prior art, the conventional voice coil motor adopts a conventional circular magnetic steel or equal-thickness tile-type magnetic steel structure, the output thrust of the motor mainly focuses on the maximum output thrust, and the fluctuation of the thrust focuses on less, so that the conventional voice coil motor cannot meet the use requirements in some application occasions sensitive to the fluctuation of the thrust.

Disclosure of Invention

The invention solves the technical problems that: aiming at the problem of larger thrust fluctuation in the prior art, a voice coil motor based on high dynamic response and low thrust fluctuation is provided.

The invention solves the technical problems by the following technical proposal:

the utility model provides a voice coil motor based on high dynamic response and low thrust fluctuation, including stator module, the rotor module, the bearing assembly, the stator module includes the stator shell, the magnet steel, the stator end cover, the rotor module includes the motor rotor, the coil module, the bearing connecting rod, the rotor terminal surface, flexible lead-out wire, the bearing assembly includes linear bearing, linear bearing sleeve subassembly, the magnet steel is installed inside the stator shell, stator shell central point puts and is provided with the linear bearing sleeve subassembly that the center through-hole is used for installing bearing assembly, the bearing connecting rod is installed in the central point put of coil module and is fixed with the rotor terminal surface, flexible lead-out wire one end welds the leading-out terminal of enameled wire in the coil module, and be drawn forth by the rotor terminal surface, flexible lead-out wire other end passes stator end cover and external connection, the motor rotor carries out linear motion through linear bearing support, the direction of motion of motor rotor and the thrust size that the bearing connecting rod output are decided according to the direction in the enameled wire of coil module, the size.

The stator shell comprises a magnetic steel annular chamber and a central through hole, wherein the magnetic steel annular chamber and the central through hole are coaxially arranged, the central through hole is formed in the inner side of the magnetic steel annular chamber, after the magnetic steel is installed in the magnetic steel annular chamber, the moving space between the magnetic steel annular chamber and the magnetic steel is the moving space of a rotor assembly, the shell of the magnetic steel annular chamber, the end part of the stator shell and the shell of the central through hole are mutually connected, and the stator shell is integrally processed.

The stator casing central point puts the central through-hole that sets up for hold the bearing housing subassembly, the spacing hole of central through-hole is used for preventing linear bearing at the mover subassembly motion in-process, and the holder of bearing component is followed stator casing tip roll-off, and the bearing connecting rod of mover subassembly passes in the spacing hole at the motion in-process, is provided with the mounting hole on the stator casing tip, is used for the voice coil motor integrated into one piece with stator subassembly, mover subassembly, bearing component and installs on external equipment, and the mounting hole is according to the circumferencial direction homogeneous arrangement of stator casing tip.

The outer side face of the magnetic steel is adhered to the inner wall of the magnetic steel annular cavity of the stator shell, a cavity is formed between the inner side face of the magnetic steel and the outer wall of the central through hole, the magnetic steel is formed by splicing magnetic steel components which are independent of each other along the circumferential direction, the magnetic steel components are spaced apart from each other along the circumferential direction and uniformly distributed to form the magnetic steel, the magnetic steel is in a step shape on the axial section, and the step number is greater than or equal to two.

The magnetic steel is made of sintered NdFeB materials, the stator shell is made of magnetic conduction cutting materials, the stator shell is subjected to nickel plating treatment, the outer wall of the annular cavity of the magnetic steel, the end part of the stator shell and the outer wall of the central through hole are arranged to be magnetic yokes, the magnetic field intensity of the magnetic steel is distributed uniformly, the magnetic circuits are smooth, the stator end cover is axially arranged on the opening side of the stator shell, and the stator end cover together enclose an inner space of the stator assembly to contain the rotor assembly.

The stator end cover is internally provided with a cylindrical space with a cavity of specified length, a boss on the opening side of the stator end cover is fixed with a concave table on the opening side of the stator shell through epoxy adhesive bonding, the sealing performance of the stator shell and the stator end cover is guaranteed, the inner side of the stator end cover is provided with two limiting grooves for limiting the rotating position of the rotor assembly in the circumferential direction, and the end face of the stator end cover is provided with a slit-shaped outlet for leading out a flexible lead-out wire.

The coil assembly part of the rotor assembly is arranged on the radial inner side of the magnetic steel of the stator assembly, the magnetic steel moves linearly relative to the stator assembly under the electromagnetic action, the bearing connecting rod extends to pass through the limiting hole of the central through hole, the bearing connecting rod is of a single cantilever structure and is fixed at the center of the end face of the rotor, the coil assembly and the end face of the rotor are integrally formed, the coil assembly moves together with the coil assembly through the bearing connecting rod, and the cantilever side of the bearing connecting rod extends out of the outer side of the voice coil motor and is used for outputting thrust.

The coil assembly comprises a coil framework and an enameled wire, wherein the coil framework is provided with a cylindrical slot, the enameled wire is uniformly wound in the cylindrical slot of the coil framework along the circumferential direction and the axial direction, the direction of current flowing through the coil assembly is perpendicular to the magnetic field direction, an electromagnetic driving force along the axis direction of the bearing connecting rod is generated, the coil assembly is driven to drive the bearing connecting rod to linearly move along the axial direction, and the enameled wire is fastened on the coil framework through impregnating varnish after winding so as to ensure that the outer surface of the coil assembly is smooth and even.

The two wire outlet ends of the enameled wire extend to the side edges of the fixed column respectively through the end face through holes of the rotor assembly and the wire passing grooves, an adhesive is applied in the wire passing grooves, the enameled wire is fixed to prevent damage of the enameled wire caused by sliding or wire loosening, the end face of the rotor is provided with four end face through holes for keeping the coil frameworks in and out communication, air resistance of the rotor assembly during moving is reduced, the fixed column of the rotor assembly is used for installing a flexible outgoing line, and the enameled wire is connected to an external circuit through the flexible outgoing line.

The voice coil motor supplies current to a coil assembly of the rotor assembly from the outside through a flexible outgoing line, the flexible outgoing line deforms to adapt to the movement of the rotor assembly during the movement of the rotor assembly, the flexible outgoing line comprises a conductive copper foil and a conductive copper foil, the conductive copper foil and the conductive copper foil are respectively powered with two outgoing line ends of corresponding enameled wires, and the conductive copper foil are arranged between a front substrate and a bottom substrate of the rotor assembly and are packaged and isolated from the outside.

The flexible lead-out wire is provided with a closed spiral ring outer ring, a linear extension part is arranged at one position of the outer edge of the closed spiral ring outer ring, the conductive copper foil and the conductive copper foil are mutually parallel in the linear extension part and outwards extend to be led out, two spiral rings are arranged in the flexible lead-out wire and are arranged at equal intervals to prevent short circuit and form a double-spiral structure, a spiral ring center hole is arranged at the right center position of the flexible lead-out wire, and two welding pads are arranged at two symmetrical positions.

The flexible outgoing line passes through the fixed column through the spiral ring central hole, is sheathed on the fixed column through the fixed ring by using epoxy resin glue, realizes the fixation of the flexible outgoing line and the end face of the rotor, the spiral ring outer ring arranged at the outer side part of the flexible outgoing line is arranged on the proximal end face of the stator end cover, and the flexible outgoing line and the rotor end face are fixed by using epoxy resin glue.

When the external circuit supplies power to the coil assembly through the flexible lead-out wire, the rotor assembly moves linearly along the axial direction, the outer ring of the spiral ring of the flexible lead-out wire is fixed on the proximal end face of the stator end cover and is kept static to be stably connected with the electricity of the external circuit, the conductive copper foil and the conductive copper foil of the flexible lead-out wire are fixed on the rotor end face and move along the axial direction of the flexible lead-out wire to be stably connected with the electricity of the coil assembly, and the two spiral rings of the flexible lead-out wire extend or shorten along the axial direction to adapt to the relative movement between the stator assembly and the rotor assembly.

When the rotor assembly rotates, the rotor assembly rotates in a specified angle range through two limiting columns on the rotor assembly and two limiting grooves formed in the stator end cover, and during the operation of the voice coil motor, the rotor assembly rotates between limiting positions in the two limiting grooves to protect the outgoing line.

The linear bearing is used for reducing friction resistance between the stator assembly and the rotor assembly, the bearing sleeve assembly is coaxially arranged in the central through hole of the stator assembly, the outer surface of the bearing sleeve is fixed to the inner surface of the central through hole, the bearing sleeve is in interference fit or clearance fit with the central through hole, and when in clearance fit, the bearing sleeve is fixedly bonded with the central through hole through epoxy resin glue, the axial length of the bearing sleeve is identical to that of the central through hole, and the end parts of the bearing sleeve are aligned.

The retainer is arranged between the bearing sleeve and the bearing connecting rod, the bearing sleeve assembly comprises a bearing sleeve and a retainer, steel balls are arranged on the retainer and uniformly distributed on the retainer along the circumferential direction and the axial direction, each steel ball is arranged in a ball chamber of the retainer, each steel ball rotates freely in the retainer, the inner part and the outer part of each steel ball extend out of the inner surface and the outer surface of the retainer respectively, the outer part of each steel ball is in rolling contact with the inner surface of the bearing sleeve, the inner part is in rolling contact with the outer surface of the bearing connecting rod, each steel ball is used as a rolling bearing between the bearing sleeve and the bearing connecting rod, and friction force of the bearing connecting rod during linear motion is reduced to realize quick response of the motion of the voice coil motor rotor assembly.

Compared with the prior art, the invention has the advantages that:

according to the voice coil motor based on high dynamic response and low thrust fluctuation, the magnetic circuit of the motor is optimized in a targeted manner for improving thrust, the structural design of the stepped magnetic steel is adopted, the thrust fluctuation is reduced while the thrust is increased, in addition, the internal connection mode of the low-damping linear bearing is adopted, the voice coil motor is ensured to run stably in the running process, the thrust fluctuation is low, the friction force is reduced, the voice coil motor has a faster response speed, and meanwhile, the reliability and the service life of the voice coil motor are greatly improved by using the flexible lead-out wire.

Drawings

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

FIG. 2 is a three view of a voice coil motor stator provided by the invention;

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

FIG. 4 is a three view of a voice coil motor mover provided by the invention;

FIG. 5 is a plan view of a flexible outlet provided by the invention;

FIG. 6 is a two-view illustration of a retaining ring provided by the invention;

FIG. 7 is a three-view of a permanent magnet of a voice coil motor provided by the invention;

Detailed Description

The utility model provides a voice coil motor based on high dynamic response and low thrust fluctuation, including stator module, the rotor module, the stator module includes stator shell 101, magnet steel 102, stator end cover 103, the rotor module includes motor rotor 200, coil module 201, the bearing connecting rod 202, rotor terminal surface 205, flexible lead-out wire 210, the bearing module includes linear bearing 300, linear bearing cover subassembly 301, magnet steel 102 installs in stator shell 101 inside, stator shell 101 central point puts and is provided with the linear bearing cover subassembly 301 that the central through-hole was used for installing the bearing module, the bearing connecting rod 202 installs in the central point of coil module 201 and is fixed with rotor terminal surface 205, flexible lead-out wire 210 one end welds the leading-out terminal of the enameled wire in the coil module 201, and be drawn forth by rotor terminal surface 205, flexible lead-out wire 210 other end passes stator end cover 103 and external connection, motor rotor 200 supports through linear bearing 300 and carries out linear motion, the direction of motion of motor rotor 200 and the thrust size that bearing connecting rod 202 output are decided by the direction, the size of electric current in the enameled wire.

The following further description of the preferred embodiments is provided in connection with the accompanying drawings of the specification:

in the current embodiment, as shown in fig. 1, the voice coil motor is mainly composed of three parts of a stator 100, a mover 200 and a bearing 300; the stator comprises a stator shell 101, magnetic steel 102 and a stator end cover 103. The magnetic steel 102 is arranged in a magnetic steel annular chamber 104 in the stator shell 101, and a central through hole 106 is arranged in the center of the stator shell 101 and used for installing a linear bearing sleeve assembly 301; the rotor 200 comprises a coil assembly 201, a bearing connecting rod 202 and a flexible outgoing line 210, wherein the bearing connecting rod 202 is arranged at the center of the coil assembly 201 and fixed with a rotor end face 205, one end of the outgoing line is welded to an outgoing end of an enameled wire 204 in the coil assembly 201 and is led out from the rotor end face 205, and the other end of the outgoing line passes through a stator end cover 103 to be connected with the outside; when the motor rotor 200 is electrified through the flexible outgoing line 210, the motor rotor 200 is supported by the linear bearing 300 in the motor to perform linear motion, and the motion direction of the motor rotor and the thrust output by the bearing connecting rod 202 are determined by the direction and the magnitude of the current in the enameled wire 204.

When the stator 100 is not provided with the stator end cover 103, the stator comprises a stator shell 101 and magnetic steel 102. As shown in fig. 2, the stator housing 101 includes a magnetic steel annular chamber 104 and a central through hole 106 concentrically arranged, the central through hole 106 being provided inside the magnetic steel annular chamber 104. After the magnetic steel 102 is installed, a certain space is still available in the magnetic steel annular chamber 104, the space is the movement space of the rotor 200, and the outer shell of the magnetic steel annular chamber 104, the end 105 of the stator shell and the outer shell of the central through hole 106 are connected with each other to form the stator shell 101, and the stator shell 101 is integrally processed. In addition, a central through hole 106 is provided in the central position of the stator housing 101 for receiving the bearing housing assembly 301, and a central through hole limiting hole 107 is provided for preventing the retainer 303 of the linear bearing 300 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 center through-hole stopper hole 107 during movement, as shown in fig. 1. The stator housing end 105 is provided with a plurality of mounting holes 108 for integrally mounting the voice coil motor to other devices. In the radial view of the stator of fig. 2, 3 mounting holes 108 are shown, which are uniformly arranged in the circumferential direction.

The magnet steel 102 is mounted within a magnet steel annular chamber 104 of the stator housing 101. The outer side surface of the magnetic steel 102 is adhered to the inner wall of the magnetic steel annular chamber 104 of the stator casing 101, and a certain cavity is formed between the inner side surface of the magnetic steel 102 and the outer wall of the central through hole 106. As shown in the radial left view of the stator in fig. 2, the magnetic steel 102 is formed by splicing 6 magnetic steel components which are independent from each other along the circumferential direction, and the magnetic steel components are spaced apart and uniformly distributed along the circumferential direction, so that the annular magnetic steel 102 is finally formed. The magnetic steel is in a ladder shape when seen from an axial section, and the number of the steps is more than or equal to 2. The magnetic steel 102 may be made of sintered neodymium iron boron material, such as N48H. The stator housing 101 is made of a cutting material with excellent magnetic permeability, such as electrical pure iron DT4C, and after the machining, the stator housing 101 needs to be subjected to nickel plating to prevent rust. Thus, the outer wall of the magnetic steel annular chamber 104, the stator shell end 105 and the outer wall of the central through hole 106 serve 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. 3, a stator end cover 103 is axially installed at an opening side of the stator case 101, which enclose an inner space of the stator 100 for accommodating the mover 200. The inside of the stator end cover 103 has a cylindrical space with a certain length, and further, a boss on the opening side of the stator end cover 103 and a recess on the opening side of the stator shell 101 are bonded and fixed by using epoxy adhesive, so that good sealing between the stator shell 101 and the stator end cover 103 is ensured. The inside of the stator end cover 103 has 2 limit grooves 109 for defining the rotational position of the mover 200 in the circumferential direction, as described below; the end face of the stator end cover 103 is provided with a slit-shaped outlet for leading out the flexible lead-out wire 210, and the rotor 200 comprises a coil assembly 201 and a bearing connecting rod 202. A portion of the coil assembly 201 is disposed radially inward of the magnetic steel 102 of the stator 100 and is linearly movable with respect to the stator 100 by 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 at the center of the rotor end surface 205, and the coil assembly 201 and the rotor end surface 205 are integrally formed, so that the bearing connecting rod 202 moves together 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. 4, the coil assembly 201 includes a bobbin 203 and an enamel wire 204. The coil skeleton 203 is a cylindrical slot, and the enameled wire 204 is uniformly wound in the slot of the coil skeleton 203 along the circumferential direction and the axial direction. Thus, the direction of the current flowing through the coil assembly 201 is substantially perpendicular to the direction of the magnetic field, generating an electromagnetic driving force along the axial direction of the bearing link 202, causing the coil assembly 201 to drive the bearing link 202 to move linearly along the axial direction. The enamel wire 204 is a high temperature resistant QY grade enamel wire having a wire diameter of about 0.2 to 0.3mm. The enameled wire 204 is fastened on the coil skeleton 203 through paint dipping after winding, and the outer surface of the coil assembly 201 is ensured to be smooth and flat.

Bearing link 202 may be made of a stainless steel material and nitrided and hardened. 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 can be reduced.

After the enameled wire 204 on the coil framework 203 is wound, two wire outlet ends of the enameled wire 204 extend to the side edges of the fixing column 208 respectively through the end face through holes 206 and the corresponding wire passing grooves 207. By applying an adhesive in the wire passing groove 207, the enamel wire 204 can be fixed, preventing the enamel wire 204 from being damaged due to sliding and loosening. In addition, the end surface 205 of the mover may be provided with 4 end surface through holes 206 for maintaining the communication between the inside and the outside of the bobbin 203, thereby reducing air resistance when the mover 200 moves. The fixing posts 208 are used to mount flexible lead wires 210, and as described below, the enamel wire 204 is connected to an external circuit via the flexible lead wires 210.

In the voice coil motor, current is supplied to the coil assembly 201 of the mover 200 from the outside through the flexible lead wires 210, and the flexible lead wires 210 may be adaptively deformed to accommodate the movement of the mover 200 during the movement of the mover 200 without affecting the power supply. The structure of the flexible lead wire 210 employed in the present invention is described below with reference to fig. 5.

The flexible lead-out wire 210 includes two conductive copper foils 211 and 212, which supply power to two wire-out ends of a corresponding one of the enamel-covered wires 204, respectively. The conductive copper foils 211 and 212 are located between the front substrate 214 and the bottom substrate 215 and are encapsulated by both 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 wires 210. As shown in fig. 5, the flexible lead-out wire 210 includes a closed spiral ring outer ring 216 having a linear extension 217 at a position of an outer edge thereof, and the conductive copper foils 211 and 212 are led out in parallel with each other in the linear extension 217. The flexible lead-out wire 210 further includes two spiral rings 213, and the two spiral rings 213 are disposed at equal intervals from each other, prevent short circuits, and form a double spiral structure. The flexible lead-out wire 210 has a spiral ring central hole 220 at the very center, with two pads 218 at two symmetrical positions.

As shown in fig. 4 to 6, the flexible outgoing line 210 passes through the fixing column 208 through the spiral ring central hole 220 and is adhered and sleeved on the fixing column 208 by epoxy resin glue through the fixing ring 219, and finally fixation of the flexible outgoing line 210 and the mover end surface 205 is achieved, and the outer part of the flexible outgoing line 210, namely the spiral ring outer ring 216, is mounted on the proximal end surface of the stator end cover 103 and both are adhered and fixed by epoxy resin glue.

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 end cover 103, kept 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 wire 210 are fixed to the mover end surface 205 and follow the axial movement thereof so as to be stably electrically connected to the coil assembly 201. Since the two spiral rings 213 of the flexible outgoing line 210 can 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 experiments, the flexible lead-out wire 210 of the invention can bear more than 3000 ten thousand reciprocating motions without damage and can bear a certain angle of circumferential rotation.

There will be some rotational movement of the mover 200. In order to prevent the lead wire 210 from being damaged due to excessive twisting caused by excessive rotation of the mover 200, the mover 200 is limited to be rotatable only within a certain angular range by two limit posts 209 provided on the mover 200 and two limit grooves 109 provided in the stator end cover 103. Thus, during operation of the voice coil motor, the mover assembly 200 can only rotate between the extreme positions within the two limit grooves 109 at most, thereby achieving the effect of protecting the lead wires 210.

The voice coil motor further includes a linear bearing 300 provided between the stator 100 and the mover 200 to reduce frictional resistance during movement of the two. The linear bearing 300 includes a bearing housing assembly 301, a bearing housing 302, a cage 303, and steel balls 304. The structure of the bearing assembly 300 is described below in conjunction with fig. 1.

The bearing housing assembly 301 is disposed concentrically within the central throughbore 106 of the stator 100. And, the outer surface of the bearing housing 302 is fixed to the inner surface of the central through hole 106. The bearing housing 302 may be an interference fit with the central through bore 106; the bearing housing 302 and the central through hole 106 can be bonded and fixed by epoxy resin glue. The axial length of the bearing housing 302 is substantially the same as the axial length of the central through bore 106, with the two ends respectively aligned.

A cage 303 is mounted between the bearing housing 302 and the bearing link 202. The bearing housing assembly 301 includes a bearing housing 302 and a cage 303, with a plurality of steel balls 304 mounted on the cage 303. The plurality of steel balls 304 are uniformly distributed on the cage 303 in the circumferential direction and the axial direction, and each steel ball 305 is located inside a corresponding ball chamber of the cage 304 so that each steel ball 304 can freely rotate within the cage 303. The inside and outside of each steel ball 304 protrude from the inner and outer surfaces of the cage 303, respectively, and the outside of each steel ball 304 is in rolling contact with the inner surface of the bearing housing 302; the interior is in rolling contact with the outer surface of the bearing link 202; thus, the plurality of steel balls 304 provide a rolling bearing with low friction between the bearing housing 302 and the bearing link 202, so that the friction of the bearing link 202 in the linear motion is minimized, thereby realizing a rapid response of the motion of the voice coil motor mover 200.

In order to ensure that the mover 200 can provide low-fluctuation thrust during operation, the magnetic steel 102 adopts a ladder-shaped structure, the ladder-shaped structure can ensure that the magnetic density in the magnetic steel annular chamber 104 in the stator 100 is unevenly distributed, and the magnetic density is larger at the opening at the right side, so that when the mover 200 operates to the right side of fig. 1, the coil assembly 201 is equivalent to the lower number of turns in a magnetic field, but the larger the air gap magnetic density is, the more the coil assembly 201 is equivalent to the left side in the magnetic field, but the smaller the air gap magnetic density is, and in 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, and the product of the four parameters is approximately equal, so that low-thrust fluctuation is realized.

The permanent magnet installation part and the linear bearing sleeve installation part in the stator shell are connected together at the end part of the stator shell, the whole stator shell is integrally formed, and a magnetic steel installation cavity in the stator shell is of a stepped structure along the axial direction, so that different magnetic circuits can be generated by the structure, and the structure is matched with the stepped magnetic steel to form a variable magnetic density structure;

the magnetic steel is in a step shape seen from the axial section, the number of steps is greater than or equal to 2, each step of the magnetic steel is annular magnetic steel seen from the circumferential direction of the stator shell, each annular magnetic steel is formed by splicing a plurality of arc-shaped magnetic steels, the annular magnetic steels are sequentially bonded together along the axial direction, and the outer side of each annular magnetic steel is bonded and fixed with the inner wall of the permanent magnet installation part of the stator shell. In the form of 2 steps, the axial lengths of the magnetic steels of different steps are respectively x and y according to the magnetic steels shown in fig. 7, and the ratio of x to y is shown to be smaller in the motor thrust fluctuation range from 0.8 to 1.2 according to the optimization result;

the coil of the rotor coil component and the coil framework are formed by combined machining, and in addition, the coil framework and the winding coil are reinforced by vacuum glue pouring, so that the mechanical strength of the motor rotor is ensured. The coil framework material is made of nonmetallic materials such as polyetherimide and the like, and induced vortex is not generated in the running process of the motor, so that the dynamic response of the motor is improved;

the end part of the rotor coil assembly is provided with a plurality of through holes, so that air in the cavity is conveniently communicated in the movement process, and the air resistance is reduced; a rotor movement space is formed in the stator end cover, the distance of linear movement of the rotor is limited along the axial direction, and a limiting groove is formed in the circumferential direction and used for preventing the rotor from deflecting in the circumferential direction in the movement process;

when the bearing connecting rod extends out of the longest position, the rotor is far away from the end face of the stator end cover; when the bearing connecting rod extends out of the shortest position, the rotor is close to the end face of the stator end cover;

the axial length of the coil is greater than that of the magnetic steel, the stator and the rotor are combined together by adopting the linear bearing, and the dynamic response of the motor can be improved in the motion process due to the small friction force of the linear bearing.

The voice coil motor in this scheme is through the special design to the structure for motor operation in-process, the operation is stable, and thrust fluctuation is low, has extremely low frictional force, makes voice coil motor have faster response speed. Moreover, through the use of flexible lead wires, the voice coil motor in the scheme also has higher reliability and service life.

Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.

What is not described in detail in the present specification belongs to the known technology of those skilled in the art.

Claims (16)

1. A voice coil motor based on high dynamic response and low thrust fluctuation is characterized in that:

including stator module, mover subassembly, bearing component, stator module includes stator shell (101), magnet steel (102), stator end cover (103), the mover subassembly includes motor rotor (200), coil module (201), bearing connecting rod (202), mover terminal surface (205), flexible lead-out wire (210), bearing component includes linear bearing (300), linear bearing cover subassembly (301), magnet steel (102) are installed inside stator shell (101), stator shell (101) central point put and are provided with central through-hole and are used for installing bearing component's linear bearing cover subassembly (301), bearing connecting rod (202) are installed in the central point of coil module (201) and are fixed with mover terminal surface (205), flexible lead-out wire (210) one end welds the leading-out terminal of enameled wire in coil module (201) to be drawn forth by mover terminal surface (205), flexible lead-out wire (210) other end passes stator end cover (103) and external connection, motor rotor (200) are supported through linear bearing (300) and are carried out linear motion, the direction of motion of motor rotor (200) and the thrust size of bearing (202) output are decided according to the direction, size of electric current in the enameled wire of coil module (201).

2. The voice coil motor based on high dynamic response and low thrust ripple of claim 1, wherein:

stator shell (101) are including magnet steel annular chamber (104), center through-hole (106), magnet steel annular chamber (104), the coaxial heart of center through-hole (106) is arranged, center through-hole (106) set up the inboard in magnet steel annular chamber (104), magnet steel annular chamber (104) are after magnet steel (102) are installed, the motion space between magnet steel annular chamber (104) and magnet steel (102) is the motion space of active cell subassembly, interconnect between the shell of magnet steel annular chamber (104), stator shell tip (105) of stator shell (101), the shell of center through-hole (106), stator shell (101) are integrated into one piece and are formed.

3. The voice coil motor based on high dynamic response and low thrust ripple of claim 1, wherein:

the stator comprises a stator shell (101), a center through hole (106) arranged at the center of the stator shell, a bearing sleeve assembly (301) is used for accommodating the center through hole (106), a limiting hole (107) of the center through hole (106) is used for preventing a linear bearing (300) from sliding out of a stator shell end (105) in the moving process of a rotor assembly (200), a bearing connecting rod (202) of the rotor assembly (200) penetrates through the limiting hole (107) in the moving process, a mounting hole (108) is formed in the stator shell end (105) and used for integrally mounting a voice coil motor formed by the stator assembly, the rotor assembly and the bearing assembly on external equipment, and the mounting hole (108) is uniformly arranged in the circumferential direction of the stator shell end (105).

4. The voice coil motor based on high dynamic response and low thrust ripple of claim 1, wherein:

the outer side face of the magnetic steel (102) is adhered to the inner wall of a magnetic steel annular cavity (104) of the stator shell (101), a cavity is formed between the inner side face of the magnetic steel (102) and the outer wall of the central through hole (106), the magnetic steel (102) is formed by splicing 6 mutually independent magnetic steel components along the circumferential direction, the magnetic steel components are mutually spaced and uniformly distributed along the circumferential direction to form the magnetic steel (102), the magnetic steel (102) is in a step shape on the axial section, and the step number is more than or equal to 2.

5. The voice coil motor based on high dynamic response and low thrust ripple of claim 4, wherein:

the magnetic steel (102) is made of sintered NdFeB materials, the stator shell (101) is made of magnetic conduction cutting materials, the stator shell (101) is subjected to nickel plating treatment, the outer wall of the magnetic steel annular chamber (104), the end part (105) of the stator shell and the outer wall of the central through hole (106) are arranged to be magnetic yokes, the magnetic field intensity of the magnetic steel (102) is distributed evenly, the magnetic circuits are smooth, the stator end cover (103) is axially arranged on the opening side of the stator shell (101), and the stator end cover are jointly enclosed to form an inner space of the stator assembly (100) so as to accommodate the rotor assembly (200).

6. The voice coil motor based on high dynamic response and low thrust ripple of claim 1, wherein:

the stator end cover (103) is internally provided with a cylindrical space with a cavity of a specified length, a boss at the opening side of the stator end cover (103) is fixed with a concave table at the opening side of the stator shell (101) through epoxy adhesive bonding, the stator end cover is used for guaranteeing tightness of the stator shell (101) and the stator end cover (103), the inner side of the stator end cover (103) is provided with 2 limiting grooves 109 for limiting the rotating position of the rotor assembly ((200)) in the circumferential direction, and the end face of the stator end cover (103) is provided with a slit-shaped outlet for leading out a flexible outgoing line (210).

7. The voice coil motor based on high dynamic response and low thrust ripple of claim 1, wherein:

the coil assembly (201) of the rotor assembly (200) is partially arranged on the radial inner side of the magnetic steel (102) of the stator assembly (100), the magnetic steel (102) moves linearly relative to the stator assembly (100) under the electromagnetic action, the bearing connecting rod (202) extends to pass through the limiting hole (107) of the central through hole (106), the bearing connecting rod (202) is of a single cantilever structure and is fixed at the center of the rotor end face (205), the coil assembly (201) and the rotor end face (205) are integrally formed, and the bearing connecting rod (202) moves together with the coil assembly (201), so that the cantilever side of the bearing connecting rod (202) extends out of the outer side of the voice coil motor to be used for outputting thrust.

8. The voice coil motor based on high dynamic response and low thrust ripple of claim 1, wherein:

the coil assembly (201) comprises a coil framework (203) and enamelled wires (204), wherein the coil framework (203) is provided with a cylindrical slot, the enamelled wires (204) are uniformly wound in the cylindrical slot of the coil framework (203) along the circumferential direction and the axial direction, the direction of current flowing through the coil assembly (201) is perpendicular to the magnetic field direction, electromagnetic driving force along the axial direction of the bearing connecting rod (202) is generated, the coil assembly (201) is driven to drive the bearing connecting rod (202) to linearly move along the axial direction, and the enamelled wires (204) are fastened on the coil framework (203) through impregnating varnish after winding so as to ensure the smoothness and flatness of the outer surface of the coil assembly (201).

9. The voice coil motor based on high dynamic response and low thrust ripple of claim 8, wherein:

two wire outlet ends of the enameled wire (204) respectively extend to the side edges of the fixed column (208) through an end face through hole (206) and a wire passing groove (207) of the rotor assembly, an adhesive is applied in the wire passing groove (207), the enameled wire (204) is fixed so as to prevent damage of the enameled wire (204) caused by sliding or loosening, 4 end face through holes (206) are formed in the rotor end face (205) and used for keeping the coil bobbins (203) communicated with each other, air resistance of the rotor assembly (200) during moving is reduced, the fixed column (208) of the rotor assembly is used for installing a flexible outgoing line (210), and the enameled wire (204) is connected to an external circuit through the flexible outgoing line (210).

10. The voice coil motor based on high dynamic response and low thrust ripple of claim 9, wherein:

the voice coil motor supplies current to a coil assembly (201) of a rotor assembly (200) from the outside through a flexible outgoing line (210), the flexible outgoing line (210) deforms to adapt to the motion of the rotor assembly (200) during the motion of the rotor assembly (200), the flexible outgoing line (210) comprises a conductive copper foil (211) and a conductive copper foil (212), the conductive copper foil (211) and the conductive copper foil (212) are respectively powered with two outgoing line ends of a corresponding enameled wire (204), and the conductive copper foil (211) and the conductive copper foil (212) are arranged between a front substrate (214) and a bottom substrate (215) of the rotor assembly and are packaged and isolated from the outside.

11. The voice coil motor based on high dynamic response and low thrust ripple of claim 10, wherein:

the flexible lead-out wire (210) is provided with a closed spiral ring outer ring (216), a linear extension part (217) is arranged at one position of the outer edge of the closed spiral ring outer ring (216), the conductive copper foil (211) and the conductive copper foil (212) are mutually parallel and outwards extend in the linear extension part (217) to be led out, two spiral rings (213) are arranged in the flexible lead-out wire (210), the two spiral rings (213) are arranged at equal intervals to prevent short circuit and form a double-spiral structure, a spiral ring center hole (220) is arranged at the right center position of the flexible lead-out wire (210), and two bonding pads (218) are arranged at two symmetrical positions.

12. The voice coil motor based on high dynamic response and low thrust ripple of claim 10, wherein:

the flexible outgoing line (210) passes through the fixing column (208) through the spiral ring center hole (220), is sleeved on the fixing column (208) through the fixing ring (219) by using epoxy resin glue, realizes the fixation of the flexible outgoing line (210) and the rotor end face (205), the spiral ring outer ring (216) arranged on the outer side part of the flexible outgoing line (210) is installed on the proximal end face of the stator end cover (103), and the flexible outgoing line and the rotor end face (205) are fixed by using epoxy resin glue.

13. The voice coil motor of claim 12, wherein the voice coil motor is based on high dynamic response and low thrust ripple, and wherein:

when an external circuit supplies power to the coil assembly (201) through the flexible outgoing line (210), the rotor assembly (200) moves linearly along the axial direction, the spiral ring outer ring (216) of the flexible outgoing line (210) is fixed on the proximal end face of the stator end cover (103), and is kept static to be stably electrically connected with the external circuit, the conductive copper foil (211) and the conductive copper foil (210) of the flexible outgoing line (210) are fixed on the rotor end face (205) and move axially along with the flexible outgoing line (210) to be stably electrically connected with the coil assembly (201), and the two spiral rings (213) of the flexible outgoing line (210) stretch or shorten along the axial direction to adapt to the relative movement between the stator assembly (100) and the rotor assembly (200).

14. The voice coil motor based on high dynamic response and low thrust ripple of claim 10, wherein:

when the rotor assembly (200) rotates, two limiting columns (209) on the rotor assembly (200) and two limiting grooves (109) arranged in the stator end cover (103) rotate in a specified angle range, and during the operation of the voice coil motor, the rotor assembly (200) rotates between limiting positions in the two limiting grooves 109 to protect the outgoing line (210).

15. The voice coil motor based on high dynamic response and low thrust ripple of claim 1, wherein:

the linear bearing (300) is used for reducing friction resistance between the stator assembly (100) and the rotor assembly (200), the bearing sleeve assembly (301) is coaxially arranged in the central through hole (106) of the stator assembly (100), the outer surface of the bearing sleeve (302) is fixed to 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) is fixed with the central through hole (106) through bonding of epoxy resin, the axial length of the bearing sleeve (302) is identical to that of the central through hole (106), and the end parts are aligned.

16. The voice coil motor of claim 15, wherein the voice coil motor is based on high dynamic response and low thrust ripple, and wherein:

the retainer (303) is arranged between the bearing sleeve (302) and the bearing connecting rod (202), the bearing sleeve assembly (301) comprises the bearing sleeve (302) and the retainer (303), steel balls (304) are arranged on the retainer (303) along the circumferential direction and the axial direction and uniformly distributed on the retainer (303), the steel balls (304) are arranged in a ball chamber of the retainer (303), the steel balls (304) rotate freely in the retainer (303), the inner part and the outer part of the steel balls (304) extend out of the inner surface and the outer surface of the retainer (303) respectively, the outer part of the steel balls (304) are in rolling contact with the inner surface of the bearing sleeve (302), the inner part of the steel balls are in rolling contact with the outer surface of the bearing connecting rod (202), and the steel balls (304) serve as rolling bearings between the bearing sleeve (302) and the bearing connecting rod (202) and are used for reducing friction force of the bearing connecting rod (202) in linear motion so as to realize quick response of the motion of the voice coil motor rotor assembly (200).