A compact voice coil motor with high thrust and high precision

Abstract

The present invention discloses a compact structure, large thrust and high precision voice coil motor, comprising a mover, a coil, a driving shaft, a first permanent magnet and a second permanent magnet; one end of the mover is connected to the driving shaft, the other end of the mover is provided with a coil and a mover window through the coil, the mover window is arranged in a direction perpendicular to the driving shaft, and the first permanent magnet and the second permanent magnet are arranged relative to the mover; in the first state, the first permanent magnet and the second permanent magnet can penetrate the mover window in the same linear direction in a manner of arranging the magnetic poles in the same direction and at intervals; in the second state, the first permanent magnet and the second permanent magnet can be arranged side by side on one side of the mover window and the magnetic pole of the first permanent magnet close to the mover is different from the magnetic pole of the second permanent magnet close to the mover. The voice coil motor can realize the reciprocating swinging motion and reciprocating linear motion of the driving shaft, thereby improving the application range of the voice coil motor.

Description

Technical Field

[0001] The invention relates to the technical field of voice coil motors, and in particular to a voice coil motor with a compact structure, high thrust and high precision. Background Art

[0002] The voice coil motor is a special form of direct drive motor. Direct drive means directly connecting the direct drive motor to the load under the control of the drive system to achieve direct drive of the load. It has the characteristics of simple structure, small size, high speed, fast acceleration, and quick response. The movement form of the voice coil motor can be linear or circular. With the development of voice coil motors, the structure of voice coil motors is more compact, the thrust is greater, and the precision is higher, making voice coil motors have very wide applications in vibration testing, medical equipment, consumer electronics, and precision positioning.

[0003] However, in the prior art, a voice coil motor can only perform one form of driving. When the two forms of motion, linear reciprocating motion and reciprocating swinging motion, need to be frequently switched, the voice coil motor needs to be used in conjunction with other motors, which greatly limits the scope of use of the voice coil motor and increases costs. Summary of the invention

[0004] In view of the above problems, the present invention proposes a voice coil motor with compact structure, large thrust and high precision to overcome the above problems or at least partially solve the above problems.

[0005] A voice coil motor with a compact structure, high thrust and high precision, comprises a mover, a coil, a drive shaft, a first permanent magnet and a second permanent magnet; one end of the mover is connected to the drive shaft, the other end of the mover is provided with the coil and a mover window passing through the coil, the mover window is arranged in a direction perpendicular to the drive shaft, and the first permanent magnet and the second permanent magnet are movably arranged relative to the mover; in a first state, the first permanent magnet and the second permanent magnet can penetrate the mover window in the same straight line direction with the magnetic poles arranged in the same direction and at intervals; in a second state, the first permanent magnet and the second permanent magnet can be arranged side by side on one side of the mover window and the magnetic pole of the first permanent magnet close to the mover is different from the magnetic pole of the second permanent magnet close to the mover.

[0006] Preferably, the compact structure, high thrust and high precision voice coil motor is also provided with a stator plate; the first permanent magnet and the second permanent magnet are arranged on the stator plate, the stator plate can be moved to penetrate the mover window, and the stator plate can be moved to one side of the mover window; the second permanent magnet is rotatably arranged on the stator plate.

[0007] Preferably, the voice coil motor with compact structure, large thrust and high precision is also provided with a sliding rod located on the housing; the sliding rod is provided with a first positioning hole and a second positioning hole, the stator plate is slidably connected to the sliding rod and a positioning pin is provided on the stator plate; in the first state, the positioning pin can be inserted into the first positioning hole; in the second state, the positioning pin can be inserted into the second positioning hole.

[0008] Preferably, the voice coil motor with compact structure, large thrust and high precision is also provided with a rotating plate, a first gear, a second gear, a third gear and a fourth gear; one end of the rotating plate is rotatably connected to the stator plate through a stator torsion spring, and the stator torsion spring can drive the rotating plate to rotate from a direction perpendicular to the driving axis to a direction parallel to the driving axis, the first gear is coaxially rotatably arranged on the stator plate with the stator torsion spring, the second gear is meshingly connected to the first gear and rotatably arranged on the rotating plate, the third gear is meshingly connected to the second gear and rotatably arranged on the rotating plate, the fourth gear is meshingly connected to the third gear and fixedly connected to the connecting plate, one end of the connecting plate is fixedly connected to the second permanent magnet, and the other end of the connecting plate is rotatably connected to the rotating plate; the mover window can limit the rotating plate in a direction perpendicular to the driving axis.

[0009] Preferably, the voice coil motor with compact structure, large thrust and high precision also includes a first cover plate, a second cover plate, a magnetic conductive plate and a shell plate; the first cover plate and the second cover plate are respectively located on both sides of the mover, the first cover plate is made of soft magnetic material and is slidably connected to the casing, the second cover plate is made of non-magnetic conductive material and is slidably connected to the casing and is provided with a cover plate window passing through the stator plate, the magnetic conductive plate is made of soft magnetic material and is arranged on the stator plate, the shell plate is made of magnetic conductive material and is slidably connected to the casing, and the two ends of the drive shaft pass through the shell plate and the casing respectively; in the first state, the The first cover plate and the second cover plate are both far away from the mover, the first cover plate is located at the end of the stator plate where the first permanent magnet is set, the magnetic conductive plate is located at the end of the second permanent magnet, and the casing and the shell plate abut against the drive shaft along the axial direction of the drive shaft to keep the drive shaft axially fixed; in the second state, the first cover plate and the second cover plate abut against both sides of the mover respectively, the drive shaft can axially reciprocate between the casing and the shell plate with the mover, and the first permanent magnet and the second permanent magnet are located at the cover plate window.

[0010] Preferably, an arc groove with a central angle of 90 degrees is provided on the rotating plate, and a stator plate pin is provided on the stator plate, and the stator plate pin extends into the arc groove; when the stator plate pin moves relatively to the two ends of the arc groove, it corresponds to the first state and the second state respectively.

[0011] Preferably, the voice coil motor with compact structure, large thrust and high precision further comprises a shaft spring; the shaft spring is located between the driving shaft and the housing to drive the driving shaft to move the coil to the cover window.

[0012] Preferably, a connecting rod is provided on the shell plate, and a third positioning hole and a fourth positioning hole are provided on the housing; in the first state, the connecting rod can extend into the third positioning hole; in the second state, the connecting rod can extend into the fourth positioning hole.

[0013] Preferably, the voice coil motor with compact structure, large thrust and high precision also includes a first connecting rod, a second connecting rod and a driving plate, and the casing is provided with a first horizontal groove and a second horizontal groove; the first cover plate is slidably connected to the first horizontal groove and is rotatably connected to one end of the first connecting rod, the other end of the first connecting rod is rotatably connected to one end of the driving plate, the other end of the driving plate is rotatably connected to one end of the second connecting rod, the other end of the second connecting rod is rotatably connected to the second cover plate, the second cover plate is slidably connected to the second horizontal groove, and the driving plate is rotatably connected to the casing between the first horizontal groove and the second horizontal groove.

[0014] Preferably, the compact structure, high thrust and high precision voice coil motor also includes a driving torsion spring; the driving torsion spring is located between the driving plate and the housing to drive the driving plate to rotate relative to the housing until the first cover plate and the second cover plate move toward the direction close to the mover; the stator plate can drive the first cover plate and the second cover plate to move away from the mover.

[0015] The compact structure, high thrust and high precision voice coil motor of the present invention has the following beneficial technical effects:

[0016] 1. In the present invention, by providing a first permanent magnet and a second permanent magnet that can be changed relative to the position of the mover, and changing the positions of the first permanent magnet and the second permanent magnet between the first state and the second state, the coil on the mover can be driven to generate forces in different directions, thereby enabling the compact structure, high thrust, and high precision voice coil motor to achieve reciprocating swinging motion of the drive shaft in the first state and reciprocating linear motion of the drive shaft in the second state, thereby improving the application range of the voice coil motor.

[0017] 2. In the present invention, a rotating plate and four gears are arranged to cooperate with each other, so that when the stator plate moves, the rotating plate cooperates with the stator torsion spring and the mover window to make the second permanent magnet reciprocate. Therefore, the positional relationship between the first permanent magnet and the second permanent magnet can be changed in the process of changing the position of the stator plate, thereby realizing the switching of the voice coil motor between the first state and the second state. The switching is convenient and the structure is simple.

[0018] 3. In the present invention, by setting the first cover plate, the second cover plate, the magnetic conductive plate and the shell plate, when the mover needs to drive the driving shaft to perform reciprocating swinging motion, the first cover plate and the second cover plate are fixed in a position separated from the mover, and the shell plate and the casing are axially close to the driving shaft, so that the mover can drive the driving shaft to reciprocate under the action of the magnetic field. When the mover needs to drive the driving shaft to perform linear reciprocating motion, the left first cover plate and the second cover plate are both in close contact with the mover, and the shell plate and the casing are released from the axial proximity to the driving shaft, so that the mover can drive the driving shaft to perform linear reciprocating motion under the action of the magnetic field. When driving the two motion modes, both are controlled by controlling the direction, commutation frequency and size of the current passed through the coil, and the control is simple and the structure is compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional structure diagram of the voice coil motor with compact structure, high thrust and high precision in the present embodiment in a reciprocating swinging motion state;

[0020] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0021] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the BB direction;

[0022] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along the CC direction;

[0023] Figure 5 When the voice coil motor with compact structure, high thrust and high precision is in linear reciprocating motion Figure 1 Schematic diagram of the cross-sectional structure along the CC direction. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] Combination Figures 1 to 5 As shown, the compact structure, high thrust and high precision voice coil motor of this embodiment comprises a mover 1, a coil 2, a driving shaft 3, a first permanent magnet 4 and a second permanent magnet 5. One end of the mover 1 is connected to the driving shaft 3, and the other end of the mover 1 is provided with a coil 2 and a mover window 6 passing through the coil 2. The mover window 6 is arranged in a direction perpendicular to the driving shaft 3, that is, the driving shaft 3 is arranged along the Figure 2 As shown in the horizontal direction, the moving window 6 is arranged along Figure 1The first permanent magnet 4 and the second permanent magnet 5 are arranged horizontally as shown. The first permanent magnet 4 and the second permanent magnet 5 are arranged movably relative to the mover 1, that is, the positions of the first permanent magnet 4 and the second permanent magnet 5 relative to the mover 1 can be changed. In the first state, the first permanent magnet 4 and the second permanent magnet 5 can penetrate the mover window 6 along the same straight line direction with the magnetic poles arranged in the same direction and at intervals, that is, Figure 1 As shown, the first permanent magnet 4 is arranged horizontally with the N pole on the left and the S pole on the right, and the second permanent magnet 5 is arranged horizontally on the right side of the first permanent magnet 4 and also with the N pole on the left and the S pole on the right. In the second state, the first permanent magnet 4 and the second permanent magnet 5 can be arranged side by side on one side of the mover window 6 and the magnetic pole of the first permanent magnet 4 close to the mover 1 is different from the magnetic pole of the second permanent magnet 5 close to the mover 1, that is, Figure 5 The first permanent magnet 4 and the second permanent magnet 5 are both located on the right side of the coil 2 and are both arranged in the horizontal direction, and the N pole of the first permanent magnet 4 is located at one end close to the coil 2, and the S pole of the second permanent magnet 5 is located at one end close to the coil 2.

[0026] In the voice coil motor with a compact structure, high thrust and high precision of the present embodiment, by arranging the first permanent magnet and the second permanent magnet which can change their positions relative to the mover, by changing the positions of the first permanent magnet and the second permanent magnet, the coil on the mover can be driven to generate forces in different directions, thereby enabling the voice coil motor with a compact structure, high thrust and high precision to operate in two different states, namely, realizing the reciprocating swinging motion of the drive shaft in the first state and realizing the reciprocating linear motion of the drive shaft in the second state, thereby improving the application range of the voice coil motor.

[0027] Combination Figures 1 to 5 As shown in the embodiment, in the compact structure, high thrust and high precision voice coil motor, a stator plate 7 is also provided. The first permanent magnet 4 and the second permanent magnet 5 are both arranged on the stator plate 7, and the stator plate 7 can be moved to the following positions: Figure 1 The stator plate 7 can also be moved to the position where the moving window 6 is inserted. Figure 5 The first permanent magnet 5 is rotatably arranged on the stator plate 7. At this time, by controlling the reciprocating movement of the stator plate, the first permanent magnet and the second permanent magnet can be driven to move relative to the mover, the positions of the first permanent magnet and the second permanent magnet can be changed, and the switching between the first state and the second state can be completed.

[0028] Combination Figure 1 As shown, in the compact structure, high thrust and high precision voice coil motor of this embodiment, a slide bar 9 is also provided on the housing 8 of the voice coil motor. Figure 1The horizontal direction shown in the figure is arranged, that is, arranged along the direction passing through the mover window 6, and a first positioning hole 10 and a second positioning hole 11 are provided on the slide bar 9. At the same time, the stator plate 7 is slidably connected to the slide bar 9 and a positioning pin 12 is provided on the stator plate 7. Figure 1 Move to the left direction as shown Figure 1 In the first state position shown in FIG. 1 , the positioning pin 12 is just moved to the first positioning hole 10 and can be inserted into the first positioning hole 10, thereby positioning the stator plate 7 at Figure 1 The first state position shown. Figure 1 When the first permanent magnet 4 and the second permanent magnet 5 are moved to the right side of the coil 2, the positioning pin 12 moves along the slide bar 9 to the second positioning hole 11 and can be inserted into the second positioning hole 11, thereby positioning the stator plate 7 at Figure 5 The corresponding second state position.

[0029] By providing a sliding rod and providing a first positioning hole, a second positioning hole and a positioning pin between the sliding rod and the stator plate for positioning and fixing the first state position and the second state position, it is possible to quickly and accurately switch the positioning between the first state and the second state, thereby improving the accuracy and speed of switching the voice coil motor of this embodiment between reciprocating linear motion and reciprocating swinging motion.

[0030] Combination Figure 1 As shown, in this embodiment, a positioning spring 13 is further provided between the positioning pin 12 and the stator plate 7. The positioning spring 13 can drive the positioning pin 12 to extend out of the stator plate 7 to the first positioning hole 10 or the second positioning hole 11, thereby completing rapid automatic positioning. By pulling the positioning pin 12 to overcome the positioning spring 13, the positioning pin 12 can be separated from the first positioning hole 10 or the second positioning hole 11, thereby completing the rapid release of the positioning restriction.

[0031] Combination Figure 1 , Figure 4 and Figure 5 As shown in the figure, in the compact structure, high thrust and high precision voice coil motor of this embodiment, a rotating plate 14, a first gear 15, a second gear 16, a third gear 17 and a fourth gear 18 are also provided. Among them, one end of the rotating plate 14 is rotatably connected to the stator plate 7 through a stator torsion spring 19, and the stator torsion spring 19 can drive the rotating plate 14 to rotate relative to the stator plate 7 from a direction perpendicular to the driving axis 3 to a direction parallel to the driving axis 3, that is, by Figure 4 The status shown turns to Figure 5The rotating plate 14 is made of soft magnetic material, the first gear 15 and the stator torsion spring 19 are coaxially rotatably arranged on the stator plate 7, the second gear 16 is meshedly connected with the first gear 15 and rotatably arranged on the rotating plate 14, the third gear 17 is meshedly connected with the second gear 16 and rotatably arranged on the rotating plate 14, the fourth gear 18 is meshedly connected with the third gear 17 and fixedly connected to the connecting plate 20, and one end of the connecting plate 20 is fixedly connected to the second permanent magnet 5, and the other end of the connecting plate 20 is rotatably connected to the rotating plate 14. At the same time, the mover window 6 can limit the rotating plate 14 in a direction perpendicular to the driving shaft 3, that is, Figure 1 and Figure 4 As shown, when the stator plate 7 penetrates into the mover window 6 , the mover window 6 can limit the rotating plate 14 along the length direction of the stator plate 7 by overcoming the stator torsion spring 19 .

[0032] In this embodiment, a rotating plate and four gears are arranged to cooperate with each other, so that when the stator plate moves, the rotating plate can make the second permanent magnet reciprocate with the cooperation of the stator torsion spring and the mover window, so that the position relationship between the first permanent magnet and the second permanent magnet and the direction of the second permanent magnet can be changed in the process of changing the position of the stator plate, thereby realizing the switching of the voice coil motor between the first state and the second state, further improving the convenience of switching, and the control structure is simple.

[0033] Combination Figures 1 to 5 As shown, in the compact structure, high thrust and high precision voice coil motor of this embodiment, a first cover plate 21, a second cover plate 22, a magnetic conductive plate 23 and a shell plate 24 are also provided. The first cover plate 21 and the second cover plate 22 are respectively located on both sides of the mover 1. The first cover plate 21 is made of soft magnetic material and forms a longitudinal direction with the shell 8. Figure 1 The second cover plate 22 is made of non-magnetic material and forms a horizontal sliding connection with the housing 8. Figure 1 The second cover plate 22 is provided with a cover window 25 passing through the stator plate 7, the magnetic plate 23 is made of soft magnetic material and is arranged on the stator plate 7, and the shell plate 24 is made of magnetic material and forms a longitudinal connection with the housing 8. Figure 2 The sliding connection in the horizontal direction is shown, and the two ends of the drive shaft 3 are respectively as shown in FIG. Figure 2 A through-shell 24 and housing 8 are shown.

[0034] exist Figure 1 In the first state shown, the first cover plate 21 and the second cover plate 22 are both located away from the mover 1, the first cover plate 21 is located at the end of the stator plate 7 where the first permanent magnet 4 is arranged, and the magnetic conductive plate 23 is located at the right end of the second permanent magnet 5, and the housing 8 and the housing plate 24 are in contact with the drive shaft 3 along the axial direction of the drive shaft 3 to keep the drive shaft 3 axially fixed. Figure 5In the second state shown, the first cover plate 21 and the second cover plate 22 respectively form abutment with the two sides of the mover 1 to limit the swing of the mover 1, and the drive shaft 3 can axially reciprocate with the mover 1 between the casing 8 and the casing plate 24, and the first permanent magnet 4 and the second permanent magnet 5 are located at the cover window.

[0035] In this embodiment, by setting the first cover plate, the second cover plate, the magnetic conductive plate and the shell plate, when the mover is required to drive the driving shaft to perform reciprocating swinging motion, the first cover plate and the second cover plate are fixed in a position separated from the mover, and the shell plate and the casing are axially pressed against the driving shaft, so that the mover can drive the driving shaft to swing reciprocatingly under the action of the magnetic field; when the mover is required to drive the driving shaft to perform linear reciprocating motion, the first cover plate and the second cover plate are both pressed against the mover, and the shell plate and the casing release the axial pressure on the driving shaft, so that the mover can drive the driving shaft to perform linear reciprocating motion under the action of the magnetic field; and in both motion modes, the motion is controlled by controlling the direction, commutation frequency and magnitude of the current passed through the coil. Such a control method is simple and has a compact structure.

[0036] Combination Figure 4 and Figure 5 As shown, in the compact structure, high thrust and high precision voice coil motor of this embodiment, an arc groove 26 with a central angle of 90 degrees is provided on the rotating plate 14, a stator plate pin 27 is provided on the stator plate 7, and the stator plate pin 27 extends into the arc groove 26. When the stator plate pin 27 moves relatively to the two ends of the arc groove 26, the voice coil motor is in the first state position and the second state position respectively.

[0037] At this time, by providing a stator plate pin and an arc groove between the rotating plate and the stator plate, the relative rotation between the rotating plate and the stator plate can be positioned, thereby improving the accuracy of switching between the first state and the second state.

[0038] Combination Figure 2 and Figure 5 As shown, in the compact structure, high thrust and high precision voice coil motor of this embodiment, an axis spring 28 is further provided. The axis spring 28 is located between the driving shaft 3 and the housing 8 to drive the driving shaft 3 to move the coil 2 to the cover window 25.

[0039] At this time, in the process of switching from the first state to the second state, after the shell plate releases the axial movement restriction on the drive shaft, the drive shaft can be moved with the help of the shaft spring, thereby moving the coil to the position through the mover. Figure 5 The cover window shown in the figure forms an automatic alignment in position with the first permanent magnet and the second permanent magnet switched to the second state.

[0040] Combination Figure 2As shown, in the voice coil motor with compact structure, large thrust and high precision of this embodiment, the driving shaft 3 and the mover 1 are connected by a flat key to form synchronous rotation, and at the same time, protrusions are provided on the driving shaft 3 on both sides of the mover 1, so that the driving shaft 3 can perform axial linear reciprocating movement with the mover 1.

[0041] Combination Figure 2 As shown, in the voice coil motor with compact structure, large thrust and high precision of this embodiment, a connecting rod 29 is further provided on the shell plate 24, and a third positioning hole 30 and a fourth positioning hole 31 are provided on the housing 8. The connecting rod 29 can move with the shell plate 24 to a position aligned with the third positioning hole 30 and extend into the third positioning hole 30, thereby being in a first state position. The connecting rod 29 can also move with the shell plate 24 to a position aligned with the fourth positioning hole 31 and extend into the fourth positioning hole 31, thereby being in a second state position.

[0042] By arranging a connecting rod and a third positioning hole and a fourth positioning hole between the shell plate and the casing, the shell plate can be accurately fixed in the first state and the second state, ensuring that the mover can accurately drive the drive shaft to perform reciprocating swing and reciprocating linear motion.

[0043] Combination Figure 2 As shown, in this embodiment, a connecting spring 32 is further provided between the connecting rod 29 and the shell plate 24. The connecting spring 32 can drive the connecting rod 29 to extend into the third positioning hole 30 or the fourth positioning hole 31, thereby enabling rapid positioning and release of the shell plate.

[0044] Combination Figures 1 to 5 As shown, in the voice coil motor with compact structure, large thrust and high precision of this embodiment, a first connecting rod 33, a second connecting rod 34 and a driving plate 35 are further provided, and a first horizontal groove 36 and a second horizontal groove 37 are provided on the housing 8. Among them, the top of the first cover plate 21 is slidably connected with the first horizontal groove 36 and is rotatably connected with one end of the first connecting rod 33, the other end of the first connecting rod 33 is rotatably connected with one end of the driving plate 35, and the other end of the driving plate 35 is rotatably connected with one end of the second connecting rod 34, the other end of the second connecting rod 34 is rotatably connected with the top of the second cover plate 22, and the top of the second cover plate 22 is also slidably connected with the second horizontal groove 37, and the driving plate 35 is rotatably connected with the housing 8 at a position between the first horizontal groove 36 and the second horizontal groove 37.

[0045] At this time, the first cover plate and the second cover plate are connected with the first connecting rod, the second connecting rod and the driving plate to form a synchronous reverse movement along the first horizontal groove and the second horizontal groove. That is, in the process of the first cover plate moving along the first horizontal groove toward the direction close to the mover, the first connecting rod, the second connecting rod and the driving plate can drive the second cover plate to move in the opposite direction along the second horizontal groove toward the mover. Conversely, in the process of the first cover plate moving along the first horizontal groove away from the mover, the first connecting rod, the second connecting rod and the driving plate can also drive the second cover plate to move in the opposite direction along the second horizontal groove away from the mover. Thereby, the speed and control convenience of the position movement of the first cover plate and the second cover plate can be improved, and the convenience and speed of switching the voice coil motor between the first state and the second state can be improved.

[0046] Combination Figures 1 to 3 As shown, in the compact structure, high thrust and high precision voice coil motor of this embodiment, a driving torsion spring 38 is also provided. The driving torsion spring 38 is located between the driving plate 35 and the housing 8 to drive the driving plate 35 to rotate until the first cover plate 21 and the second cover plate 22 move toward the direction close to the mover 1, and move to Figure 5 The stator plate 7 can drive the first cover plate 21 and the second cover plate 22 to move away from the mover 1 until Figure 4 Position shown.

[0047] By setting a driving torsion spring between the driving plate and the casing, the reciprocating movement of the stator plate can be coordinated to achieve synchronous reciprocating movement of the first cover plate and the second cover plate with the stator plate, thereby achieving synchronous automatic movement of multiple components when switching between the first state and the second state, further improving the operating convenience of the voice coil motor.

[0048] Combination Figures 1 to 5 As shown, the specific working process of the voice coil motor with compact structure, high thrust and high precision in this embodiment is as follows:

[0049] When the compact structure, high thrust and high precision voice coil motor of this embodiment is in Figures 1 to 4In the first state shown, the first permanent magnet 4 and the second permanent magnet 5 are on the same straight line under the action of the stator plate 7 and penetrate into the mover 1, and the left side of the first permanent magnet 4 is the N pole and the right side is the S pole, and the left side of the second permanent magnet 5 is the N pole and the right side is the S pole. At this time, if reciprocating swinging motion is required, the coil 2 is energized. Since the housing 8, the first cover plate 21, the magnetic plate 23 and the shell plate 24 are made of soft magnetic materials, and the second cover plate 22 is made of non-magnetic material, according to the Ampere force principle, the coil 2 in the energized state generates magnetic fields at the first permanent magnet 4 and the second permanent magnet 5. The force generated in the field is applied. Since the mover 1 and the driving shaft 3 are connected by a flat key, the driving shaft 3 is driven to rotate through the coil 2 and the mover 1. The direction of the force generated by the coil 2 in the magnetic field can be changed by changing the direction of the current in the coil 2. The rotation direction of the driving shaft 3 can be controlled by controlling the direction of the current in the coil 2. The rotation angle of the driving shaft 3 can be controlled by controlling the commutation frequency of the current. The torque of the driving shaft can be controlled by controlling the magnitude of the current. Finally, the driving shaft 3 can be controlled to perform reciprocating swinging motion within a certain angle.

[0050] When linear reciprocating motion is required, the connecting rod 29 is first pulled to overcome the connecting spring 32 and disengage from the third positioning hole 30, and then the shell plate 24 is pulled outward along the drive shaft 3. When the connecting rod 29 moves with the shell plate 24 to align with the fourth positioning hole 31, the connecting rod 29 extends into the fourth positioning hole 31 under the restoring force of the connecting spring 32, completing the positioning of the shell plate 24 in the second state, that is, Figure 5 The shell plate 24 is positioned as shown, thereby leaving space for the first cover plate 21 and the second cover plate 22 to move toward the mover 1, and then the positioning pin 12 is pulled to overcome the positioning spring 13 and break away from the connection with the first positioning hole 10, and then the slide rod 9 is moved to Figure 1 The stator plate 7 is pulled in the right direction as shown to move until the positioning pin 12 moves with the stator plate 7 to align with the second positioning hole 11 and extends into the second positioning hole 11 under the restoring force of the positioning spring 13, thereby positioning the stator plate 7 in the second state. In this process, the driving plate 35 is rotated under the action of the driving torsion spring 38 to drive the first cover plate 21 and the second cover plate 22 to move in the direction close to the mover 1, that is, the first cover plate 21 is moved along the first horizontal groove 36 through the first connecting rod 33. Figure 1 The second cover plate 22 moves in the right direction as shown, and the second cover plate 22 moves along the second horizontal groove 37 through the second connecting rod 34. Figure 1 The first cover plate 21 and the second cover plate 22 move to the left side of the Figure 5In addition, as the stator plate 7 moves toward the second positioning hole 11, the stator plate 7 carries the second permanent magnet 5 and the first permanent magnet 4 through the mover window 6 and the cover window 25. When the rotating plate 14 moves to the right side of the mover 1 with the stator plate 7, the rotating plate 14 begins to rotate relative to the stator plate 7 under the action of the stator torsion spring 19, i.e., Figure 4 As shown, the first gear 15, the second gear 16, the third gear 17 and the fourth gear 18 rotate clockwise. Under the transmission connection, the second permanent magnet 5 rotates with the rotating plate 14 relative to the stator plate 7 and also rotates on its own. The stator plate pin 27 also slides relatively in the arc groove 26. When the rotating plate 14 rotates 90 degrees, the stator plate pin 27 moves to the end of the arc groove 26 and stops sliding relatively. The second permanent magnet 5 also rotates to Figure 5 The position state shown, that is, the second permanent magnet 5 rotates to a position parallel to the first permanent magnet 4 and the left side of the first permanent magnet 4 is the N pole, and the left side of the second permanent magnet 5 is the S pole, so that the switching from the first state to the second state is completed. In addition, when the stator plate 7 leaves the mover window 6, the drive shaft 3 moves toward the direction close to the shell plate 24 under the action of the shaft spring 28, and the coil 2 is brought to a position aligned with the cover window 25 through the mover 1, that is, Figure 5 After that, the coil 2 is energized, and the coil 2 in the energized state generates a force in the magnetic field generated by the first permanent magnet 4 and the second permanent magnet 5, and drives the drive shaft 3 to slide axially through the coil 2 and the mover 1. By controlling the current direction, the frequency of the current commutation and the current magnitude, the drive shaft 3 can be controlled to perform linear reciprocating motion, and the amplitude and thrust of the linear reciprocating motion can be controlled.

[0051] When the voice coil motor needs to be reset, Figure 5 The second state shown is reset to Figures 1 to 4 In the first state shown, the driving shaft 3 is pushed to overcome the shaft spring 28 and move away from the shell plate 24, that is, Figure 5 The mover 1 is moved upward as shown in the figure, and the mover window 6 is moved to the position where the mover window 6 is aligned with the stator plate 7 again, and then the positioning pin 12 is pulled to overcome the positioning spring 13 and break away from the connection with the second positioning hole 11, and the slide rod 9 is moved to the Figure 1The stator plate 7 is pushed to move in the left direction as shown, until the positioning pin 12 is reset with the stator plate 7 to align with the first positioning hole 10 and re-extends into the first positioning hole 10 under the restoring force of the positioning spring 13, thereby resetting the stator plate 7 to the position of the first state. In this process, as the stator plate 7 penetrates the mover window 6, the rotating plate 14 is brought into contact with the mover 1, and the mover 1 pushes the rotating plate 14 to overcome the stator torsion spring 19 and rotate in the opposite direction. At the same time, under the transmission connection of the first gear 15, the second gear 16, the third gear 17 and the fourth gear 18, the second permanent magnet 5 rotates in the opposite direction and rotates in the opposite direction relative to the stator plate 7 with the rotating plate 14, until the rotating plate 14 rotates and resets to Figure 4 In the horizontal direction shown, the second permanent magnet 5 rotates and resets to be in the same straight line with the first permanent magnet 4, that is, Figure 1 At the same time, when the stator plate 7 moves Figure 1 After moving to the left side and contacting the first cover plate 21, the stator plate 7 starts to push the first cover plate 21 along the first horizontal groove 36 to Figure 3 The first connecting rod 33 pushes the driving plate 35 to overcome the effect of the driving torsion spring 38 and drives the second connecting rod 34 to move, thereby synchronously driving the second cover plate 22 to move along the second horizontal groove 37. Figure 3 When the stator plate 7 is reset to the position of the first state, the first cover plate 21 and the second cover plate 22 are just moved and reset to a position away from the mover 1, that is, Figure 1 As shown in the figure, the space between the first cover plate 21 and the second cover plate 22 is cleared again, and then, the connecting rod 29 is pulled to overcome the connecting spring 32 and break away from the connection with the fourth positioning hole 31, and the shell plate 24 is pushed inward along the drive shaft 3. When the connecting rod 29 moves with the shell plate 24 to align with the third positioning hole 30, the connecting rod 29 extends into the third positioning hole 30 under the action of the restoring force of the connecting spring 32, so that the shell plate 24 moves back to the Figure 2 The reset work is now completed.

Claims

1. A compact structure, high thrust and high precision voice coil motor, characterized in that: It comprises a mover, a coil, a driving shaft, a first permanent magnet and a second permanent magnet; one end of the mover is connected to the driving shaft, the other end of the mover is provided with the coil and a mover window passing through the coil, the mover window is arranged in a direction perpendicular to the driving shaft, and the first permanent magnet and the second permanent magnet are movably arranged relative to the mover; in a first state, the first permanent magnet and the second permanent magnet can penetrate the mover window in the same straight line direction in a manner of arranging the magnetic poles in the same direction and at intervals; in a second state, the first permanent magnet and the second permanent magnet can be arranged side by side on one side of the mover window, and the magnetic pole of the first permanent magnet close to the mover is different from the magnetic pole of the second permanent magnet close to the mover; The compact structure, high thrust and high precision voice coil motor is also provided with a stator plate; the first permanent magnet and the second permanent magnet are arranged on the stator plate, the stator plate can be moved to penetrate the mover window, and the stator plate can be moved to one side of the mover window; the second permanent magnet is rotatably arranged on the stator plate; The voice coil motor with compact structure, large thrust and high precision is also provided with a rotating plate, a first gear, a second gear, a third gear and a fourth gear; one end of the rotating plate is rotatably connected to the stator plate through a stator torsion spring, and the stator torsion spring can drive the rotating plate to rotate from a direction perpendicular to the driving axis to a direction parallel to the driving axis, the first gear is coaxially rotatably arranged on the stator plate with the stator torsion spring, the second gear is meshedly connected to the first gear and rotatably arranged on the rotating plate, the third gear is meshedly connected to the second gear and rotatably arranged on the rotating plate, the fourth gear is meshedly connected to the third gear and fixedly connected to the connecting plate, one end of the connecting plate is fixedly connected to the second permanent magnet, and the other end of the connecting plate is rotatably connected to the rotating plate; the mover window can limit the rotating plate in a direction perpendicular to the driving axis; The compact structure, high thrust and high precision voice coil motor also includes a first cover plate, a second cover plate, a magnetic plate and a shell plate; the first cover plate and the second cover plate are respectively located on both sides of the mover, the first cover plate is made of soft magnetic material and is slidably connected to the casing, the second cover plate is made of non-magnetic material and is slidably connected to the casing and is provided with a cover plate window passing through the stator plate, the magnetic plate is made of soft magnetic material and is arranged on the stator plate, the shell plate is made of magnetic material and is slidably connected to the casing, and the two ends of the drive shaft pass through the shell plate and the casing respectively; in the first state, the first cover .... The first cover plate and the second cover plate are both far away from the mover, the first cover plate is located at the end of the stator plate where the first permanent magnet is set, the magnetic conductive plate is located at the end of the second permanent magnet, and the casing and the casing plate abut against the drive shaft along the axial direction of the drive shaft to keep the drive shaft axially fixed; in the second state, the first cover plate and the second cover plate abut against the two sides of the mover respectively, the drive shaft can axially reciprocate between the casing and the casing with the mover, and the first permanent magnet and the second permanent magnet are located at the cover plate window.

2. The voice coil motor with compact structure, high thrust and high precision according to claim 1, characterized in that: The voice coil motor with compact structure, large thrust and high precision is also provided with a slide bar located on the housing; the slide bar is provided with a first positioning hole and a second positioning hole, the stator plate is slidably connected to the slide bar and a positioning pin is provided on the stator plate; in the first state, the positioning pin can be inserted into the first positioning hole; in the second state, the positioning pin can be inserted into the second positioning hole.

3. The compact structure, high thrust and high precision voice coil motor according to claim 1, characterized in that: The rotating plate is provided with an arc groove with a central angle of 90 degrees, and the stator plate is provided with a stator plate pin, which extends into the arc groove; when the stator plate pin moves relatively to the two ends of the arc groove, it corresponds to the first state and the second state respectively.

4. The compact structure, high thrust and high precision voice coil motor according to claim 1, characterized in that: The voice coil motor with compact structure, large thrust and high precision also includes a shaft spring; the shaft spring is located between the driving shaft and the housing to drive the driving shaft to move the coil to the cover window.

5. The compact structure, high thrust and high precision voice coil motor according to claim 1, characterized in that: The shell plate is provided with a connecting rod, and the housing is provided with a third positioning hole and a fourth positioning hole; in the first state, the connecting rod can extend into the third positioning hole; in the second state, the connecting rod can extend into the fourth positioning hole.

6. The compact structure, high thrust and high precision voice coil motor according to claim 1, characterized in that: The voice coil motor with compact structure, large thrust and high precision also includes a first connecting rod, a second connecting rod and a driving plate, and the casing is provided with a first horizontal groove and a second horizontal groove; the first cover plate is slidably connected to the first horizontal groove and is rotatably connected to one end of the first connecting rod, the other end of the first connecting rod is rotatably connected to one end of the driving plate, the other end of the driving plate is rotatably connected to one end of the second connecting rod, the other end of the second connecting rod is rotatably connected to the second cover plate, the second cover plate is slidably connected to the second horizontal groove, and the driving plate is rotatably connected to the casing between the first horizontal groove and the second horizontal groove.

7. The compact structure, high thrust and high precision voice coil motor according to claim 6, characterized in that: The compact structure, high thrust and high precision voice coil motor also includes a driving torsion spring; the driving torsion spring is located between the driving plate and the housing to drive the driving plate to rotate relative to the housing until the first cover plate and the second cover plate move toward the direction close to the mover; the stator plate can drive the first cover plate and the second cover plate to move away from the mover.

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