CN214591209U - Alternate rowing type piezoelectric linear motor - Google Patents
Alternate rowing type piezoelectric linear motor Download PDFInfo
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- CN214591209U CN214591209U CN202023282551.1U CN202023282551U CN214591209U CN 214591209 U CN214591209 U CN 214591209U CN 202023282551 U CN202023282551 U CN 202023282551U CN 214591209 U CN214591209 U CN 214591209U
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Abstract
The utility model discloses an alternative rowing type piezoelectric linear motor, which consists of a stator and a U-shaped outer frame thereof, a connecting block, a rotor and an elastic prepressing mechanism thereof, and a base; the stator consists of two layers of stator assemblies, wherein each stator assembly consists of a displacement amplifying mechanism, two groups of laminated piezoelectric ceramics, a flexible support, a pre-tightening mechanism and two spherical cushion blocks; the stator is fixedly connected in the U-shaped outer frame, and the lower frame and the connecting block of the U-shaped outer frame are fixed on the base through bolts; the elastic prepressing mechanism is arranged on two sides of the U-shaped outer frame along the width direction of the U-shaped outer frame and forms a certain gap with the U-shaped outer frame, and the contact flat plate of the rotor comprises a first part arranged in the gap and a second part lapped on the upper surface of the elastic prepressing mechanism; the elastic prepressing mechanism keeps the contact of the rotor and the stator under the prepressing action generated by elastic deformation. And signals with phases sequentially delayed by 90 degrees are respectively applied to the four groups of laminated piezoelectric ceramics of the motor, so that the alternate driving of the double driving feet of the motor is realized.
Description
Technical Field
The utility model relates to an off-resonance piezoelectricity linear electric motor belongs to piezoelectricity precision actuation technical field.
Background
The piezoelectric ceramic can convert electric energy into mechanical energy by utilizing the inverse piezoelectric effect of the piezoelectric ceramic. The piezoelectric ceramic has the advantages of fast response, high precision, small size and the like, and is suitable for being used as a driving device of a precise micro-displacement mechanism.
However, the piezoelectric ceramic has a limitation of small strain while having a high rigidity. In order to obtain larger electrostriction under the limited electric field intensity, the multi-layer sheet piezoelectric ceramics are mechanically connected in series, and the laminated piezoelectric ceramics manufactured in an electrical parallel mode can obtain micron-sized deformation under the action of lower voltage. The device is applied to a plurality of leading-edge technical fields of ultra-precision machining, optical precision engineering, electronics, biological medical treatment and the like.
In order to further expand the actuation stroke of the piezoelectric ceramics and realize the crossing from micron level to centimeter level or even decimeter level, two major piezoelectric linear motors based on the excitation of the piezoelectric ceramics are produced.
The piezoelectric linear motor is an actuator which converts micron-amplitude mechanical vibration generated by exciting an elastic body by a piezoelectric element into linear motion of a rotor through friction coupling. The piezoelectric linear motor can be divided into a resonant type and a non-resonant type according to different vibration modes of the elastic body. The non-resonant piezoelectric linear motor is more stable and reliable compared with a resonant piezoelectric linear motor.
According to whether there is a change in normal contact force on the frictional coupling interface, the non-resonant piezoelectric linear motors can be divided into two main categories: the acting force of the inertia impact type (CN111973338A) and the differential clamping type (CN210093126U) piezoelectric motors in the normal direction of the contact surface is kept constant; the normal force fluctuation exists in the normal direction of a contact surface in an elliptic vibration type (Wangyin, Pansong, Huangweiqing, radix cynanchi paniculatae. triangular displacement conversion type piezoelectric linear motor [ J ]. optical precision engineering, 2016,24(08):1973 and 1979.) and a multi-foot alternative driving type (CN 102195516A). The fluctuation of the normal force reduces the useless work done by the friction force, can prolong the service life of the motor and increase the efficiency of the motor.
In the non-resonant piezoelectric linear motor with the fluctuation of the normal force, the elliptical vibration type motor has a lower working frequency limit, the working process on the contact surface is always in a relative sliding state, relatively speaking, the multi-foot alternate driving type does work in a mode of less sliding friction or even no relative sliding, and the multi-foot alternate driving type piezoelectric linear motor has the advantages of large thrust and high efficiency.
In the multi-foot alternative driving type piezoelectric linear motor, the problems of small stroke and short service life exist in the prior art. The reason for this is that, in such schemes, the normal force on the friction interface is changed by directly utilizing the deformation of the laminated piezoelectric ceramics or adopting a compliant amplification mechanism to a certain extent, and because the deformation of the laminated piezoelectric ceramics is only in the micrometer order, the friction force which can be generated by the method is very limited. In addition, microscopic undulations of the friction interface may cause incomplete disengagement of the clamping foot, and wear of the contact surfaces caused by prolonged rubbing may also reduce the clamping force caused by limited deformation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to above-mentioned background art, the utility model provides an alternative formula of rowing boat piezoelectricity linear electric motor, it has advantages such as biped drive, work efficiency height, output thrust are big, resolution of motion height.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
alternate rowing type piezoelectric linear motor, comprising: the stator and the U-shaped outer frame thereof, the connecting block, the rotor and the elastic prepressing mechanism thereof and the base are arranged on the stator; the stator is fixedly connected in the U-shaped outer frame, and the lower frame and the connecting block of the U-shaped outer frame are fixed on the base through bolts; the elastic prepressing mechanism is arranged on two sides of the U-shaped outer frame along the width direction of the U-shaped outer frame and forms a certain gap with the U-shaped outer frame, and the contact flat plate of the rotor comprises a first part arranged in the gap and a second part lapped on the upper surface of the elastic prepressing mechanism; the elastic prepressing mechanism keeps the contact of the rotor and the stator under the action of prepressing force generated by elastic deformation;
the elastic prepressing mechanism is arranged on the base.
In a preferred embodiment: the stator consists of a two-layer stator assembly; the two-layer stator assembly extends along the direction parallel to the upper frame and the lower frame and is fixedly connected with the upper frame and the lower frame respectively.
In a preferred embodiment: the stator assembly comprises a displacement amplifying mechanism, two groups of laminated piezoelectric ceramics, a flexible support, a pre-tightening mechanism and a spherical cushion block;
when electric signals with 90-degree phase difference are respectively applied to the two groups of laminated piezoelectric ceramics, the driving feet of the stator assembly vibrate in an elliptic closed track motion mode, and therefore the rotor is pushed to move.
In a preferred embodiment: the displacement amplifying mechanism consists of a triangular amplifying arm, a flexible hinge and the driving foot;
the triangular amplifying arms are divided into two groups, and each group is provided with two triangular amplifying arms; one end of each of the two triangular amplifying arms in the same group is connected with the flexible hinge, and the other end of each of the two triangular amplifying arms is connected with the same driving foot.
In a preferred embodiment: the two groups of laminated piezoelectric ceramics are arranged between the two groups of triangular amplifying arms along the length direction of the displacement amplifying mechanism; and one opposite sides of the two groups of laminated piezoelectric ceramics are respectively connected with the flexible supports through spherical cushion blocks.
In a preferred embodiment: the top of the flexible support is connected with the spherical cushion block, the bottom of the flexible support is inserted into the lower frame or the upper frame of the U-shaped outer frame, and the whole stator assembly is fixed on the U-shaped outer frame by bolts;
there are two flexible hinges for the flexible support.
In a preferred embodiment: the pre-tightening mechanism consists of a pre-tightening bolt, a cylindrical pressing block and a positioning pin;
when the pre-tightening bolt is tightened, the cylindrical pressing block is pushed to apply pre-tightening force to the laminated piezoelectric ceramic; the cylindrical pressing block is provided with a limiting groove, the positioning pin is inserted into the limiting groove to limit the cylindrical pressing block along the circumferential direction, and the cylindrical pressing block can only translate along the axial direction.
In a preferred embodiment: one end of the upper frame and one end of the lower frame of the U-shaped outer frame are connected with each other through the middle frame.
In a preferred embodiment: the rotor also comprises a contact flat plate and a rotor guide rail; the contact flat plate is in contact with the stator driving foot to transmit the friction force of the stator to the rotor; the rotor guide rail is arranged on the base, so that the rotor can do linear motion along the guide rail.
In a preferred embodiment: the elastic prepressing mechanism consists of four prepressing brackets and two connecting plates; the connecting plates are respectively connected to the bottoms of the two preloading brackets; and the connecting plate is in sliding connection with the rotor guide rail.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect:
the utility model provides an in turn formula of rowing boat piezoelectricity linear electric motor, drive element take symmetrical arrangement for stromatolite piezoceramics, and reasonable stator inner space that utilizes makes whole stator compact structure, small, be convenient for processing and assembly. The working frequency of the motor is low, so that the adverse effect of system resonance on the performance of the motor can be avoided, and the stability and the anti-interference capability of the motor are improved;
the utility model provides an alternative rowing type piezoelectric linear motor, the stator adopts an upper layer and a lower layer to arrange, the stator assembly of each layer can work alone, the upper and lower stator assemblies alternately push the rotor to do linear motion, so that the rotor is pushed in the whole working period, and the working efficiency of the motor is improved; the pre-tightening mechanism of the stator assembly can provide adjustable pre-tightening force for the laminated piezoelectric ceramic, and can prevent the laminated piezoelectric ceramic from being damaged by shearing force; the flexible support of the stator assembly can be used for self-adapting to the parallelism or straightness errors of the contact surfaces of the rotors on the two sides, so that the running stability of the motor is improved; the design of U-shaped frame has made things convenient for stator assembly's installation location, has improved motor element's position accuracy.
The utility model provides an alternate rowing type piezoelectric linear motor, an elastic prepressing mechanism can provide normal prepressing force for a stator, so that a driving foot of the stator is always in contact with a contact flat plate of a rotor; the rotors are symmetrically arranged, so that the rotors are stressed uniformly, the friction resistance of the motor during working is reduced, and the output force of the motor is increased.
Drawings
FIG. 1 is a block diagram of an alternate rowing piezoelectric linear motor;
FIG. 2 is a view showing the structure of the stator, U-shaped frame and connecting member of the piezoelectric motor;
FIG. 3 is a block diagram of a piezoelectric motor stator assembly;
FIG. 4 is a structural diagram of a piezoelectric linear motor mover and an elastic pre-pressing mechanism;
FIG. 5 is a graph of excitation signals applied to stacked piezoelectric ceramic stacks of a stator assembly;
FIG. 6 is a diagram of the mechanism of the piezoelectric motor stator assembly during a single cycle of operation;
wherein, the labels in the figure are: 1-a stator; 2-a U-shaped outer frame; 3, connecting blocks; 4, a rotor; 5, an elastic prepressing mechanism; 6, a base; 11-stator assembly 1; 12-stator assembly 2; 21-an upper frame of the U-shaped outer frame; 22-a middle frame of a U-shaped outer frame; 23-a lower frame of the U-shaped outer frame; 31. 32, connecting blocks; 41. 42-contact plate; 43. 44-mover guide; 51. 52, 53, 54-preload mounts; 55. 56-connecting plate;
a 1-displacement amplification mechanism; b1, b 2-laminated piezoelectric ceramics; c1 — flexible support; d 1-pretensioning mechanism; e 2-spherical spacer;
a 11-triangle enlarging arm; a 12-Flexible hinge; a13, a 14-drive foot; d 11-a pre-tightening bolt, d 12-a cylindrical press block and d 13-a positioning pin.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected," may be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected between two elements.
As shown in fig. 1, the alternative rowing piezoelectric linear motor of the present embodiment comprises a stator 1, a U-shaped outer frame 2 thereof, a connecting block 3, a mover 4, an elastic pre-pressing mechanism 5 thereof, and a base 6; the stator 1 is fixedly connected in the U-shaped outer frame 2, and a connecting part of a lower frame of the U-shaped outer frame 2 and the connecting block 3 is fixed on the base 6 through a bolt; the elastic prepressing mechanisms 5 are arranged on two sides of the U-shaped outer frame 2 along the width direction of the U-shaped outer frame 2 and form a certain gap with the U-shaped outer frame 2, and the contact flat plates 41 and 42 of the rotor 4 comprise a first part arranged in the gap and a second part lapped on the upper surface of the elastic prepressing mechanisms.
After the design is adopted, the elastic prepressing mechanism 5 puts up the contact flat plate of the rotor 4, and can keep the contact flat plate of the rotor 4 in contact with the stator 1 under the action of prepressing force generated by elastic deformation of the elastic prepressing mechanism; the elastic prepressing mechanism 5 is arranged on the base 6.
As shown in fig. 2 and 3, the stator 1 is composed of two- layer stator assemblies 11 and 12. The stator assemblies 11 and 12 are respectively fixedly connected with the upper frame and the lower frame of the U-shaped outer frame 2. The stator assembly 11 is composed of a displacement amplifying mechanism a1, two groups of laminated piezoelectric ceramics b1 and b2, a flexible support c1, a pre-tightening mechanism d1 and two spherical cushion blocks e1 and e 2.
When two groups of laminated piezoelectric ceramics b1 and b2 are respectively applied with electric sinusoidal signals with a phase difference of 90 degrees, the driving feet a13 and a14 of the stator assembly 11 do elliptic orbit motion, thereby pushing the rotor 4 to move. The structure of the stator assembly 12 is the same as that of the stator assembly 11, and is not described again.
As shown in fig. 3, the displacement amplification mechanism a1 is composed of a triangular amplification arm a11, a flexible hinge a12, and driving feet a13 and a14, and a set of stacked piezoelectric ceramics b1 and b2 are respectively installed inside a displacement amplification mechanism a1 along the length direction; a flexible support c1 is connected between the laminated piezoelectric ceramics b1 and b 2;
the displacement amplifying mechanism a1 is designed by adopting a symmetrical structure, the triangular amplifying arms a11 are divided into two groups which are respectively arranged at the upper side and the lower side of the laminated piezoelectric ceramics b1 and b2, the two groups of triangular amplifying arms a11 are respectively provided with two triangular amplifying arms, and the two triangular amplifying arms are respectively connected with driving feet a13 and a 14. The two driving feet a13 and a14 are used for realizing bidirectional driving of the motor, wherein the triangular amplifying arm a11 can amplify output displacement of the laminated piezoelectric ceramics b1 and b2 so as to increase output force of the motor.
As shown in fig. 3, the bottom of the laminated piezoelectric ceramic b2 is connected with the inner wall of a displacement amplification mechanism a1, the spherical head is connected with a spherical pad e2, and the connection mode of the laminated piezoelectric ceramic b1 is the same as that of b 2. The four groups of laminated piezoelectric ceramics are symmetrically arranged in the two layers of stator assemblies 11 and 12, and certain electric signals are applied to excite the driving feet of the two layers of stator assemblies 11 and 12 to alternately move.
As shown in fig. 3, the top of the flexible support c1 is connected to a spherical spacer e2, and the bottom is inserted into the U-shaped outer frame lower frame 23 or the upper frame 21, so that the whole stator assembly 11, 12 is fixed to the U-shaped outer frame 2 by bolts. The flexible supports c1 and c2 have two flexible hinges, so that automatic centering of the stator assembly 11 can be realized, and the stator driving feet a13 and a14 are always in contact with the rotor 4. The stator assembly 12 is the same as the above, and will not be described again.
As shown in fig. 3, the pre-tightening mechanism d1 is composed of a pre-tightening bolt d11, a cylindrical pressing block d12 and a positioning pin d13, when the pre-tightening bolt d11 is tightened, the cylindrical pressing block d12 is pushed to apply pre-tightening force to the laminated piezoelectric ceramics b1 and b2, and the pre-tightening force can be adjusted through threads locked by the pre-tightening bolt d 11; the cylindrical press block d12 is provided with a limiting groove, and a positioning pin is inserted into the limiting groove to limit the cylindrical press block along the circumferential direction, so that the cylindrical press block can only translate along the axial direction, the laminated piezoelectric ceramics b1 and b2 are ensured to only bear pressure in the screwing process of the pre-tightening bolt d11, and the laminated piezoelectric ceramics are prevented from being damaged due to shearing force.
As shown in fig. 2, the U-shaped outer frame 2 is composed of an upper frame 21, a middle frame 22, and a lower frame 23, and the stator assemblies 11 and 12 are fixedly connected in the U-shaped outer frame 2 by bolts. The upper frame 21 and the lower frame 23 of the U-shaped outer frame 2 are respectively fixedly connected with the flexible supports c1 and c2 of the two-layer stator assembly through bolts, wherein the lower frame 23 of the U-shaped outer frame is connected with the connecting blocks 31 and 32; the middle frame 22 of the U-shaped outer frame connects and fixes the upper frame 21 and the lower frame 23 through bolts, thereby forming the whole U-shaped outer frame 2.
As shown in fig. 1, the U-shaped outer frame 2 can be fixed on the base 6 by the connecting block 3 through bolts, so that the whole stator 1 is fixed.
As shown in fig. 1 and 4, the mover 4 is composed of contact plates 41 and 42 and mover guide rails 43 and 44; the contact plate 41 is in contact with the driving foot a13, the contact plate 42 is in contact with the driving foot a14, and the friction force of the stator 1 is transmitted to the mover 4; the mover guide rails 43, 44 are installed on the base 6, so that the mover 4 linearly moves along the guide rails 43, 44.
As shown in fig. 1 and 4, the elastic pre-pressing mechanism 5 is composed of pre-loading brackets 51, 52, 53, 54 and connecting plates 55, 56; the elastic prepressing mechanisms 5 are arranged on two sides of the U-shaped outer frame along the width direction of the U-shaped outer frame 2, a certain gap is formed between the elastic prepressing mechanisms and the U-shaped outer frame, and the contact flat plates 41 and 42 of the rotor comprise a first part arranged in the gap and a second part lapped on the upper surface of the elastic prepressing mechanisms; the elastic prepressing mechanism 5 keeps the contact between the rotor 2 and the stator 1 under the action of prepressing force generated by elastic deformation;
the preloading supports 51, 52, 53 and 54 can elevate the whole mover 4 to match the U-shaped outer frame 2, and the flexible hinges in the preloading supports can enable the preloading supports to have certain automatic adjustment capacity; the coupling plate 55 couples the preload holder 52 with the preload holder 53, and the coupling plate 56 couples the preload holder 54 with the preload holder 55, ensuring that the mover 4 moves integrally therewith. The connection plates 55, 56 are slidably connected to the mover guide rails 43, 44.
As shown in fig. 5, the voltage signals applied to the four sets of laminated piezoelectric ceramics by the motor in the operating mode, in order to realize the alternating motion of the dual driving feet, the phase relationship of the excitation signals of the four sets of laminated piezoelectric ceramics is sequentially delayed by 90 °, the phase difference of the laminated piezoelectric ceramics on the same stator assembly is 90 °, and the phase difference of the laminated piezoelectric ceramics on different stator assemblies is 180 °.
FIG. 6 shows the movement mechanism diagram of the voltage in one working cycle, and with reference to FIG. 5 and FIG. 6, A, B, C, D shows the positions of the stator assembly 11 in the periods of 0-T/4, T/4-T/2, T/2-3T/4, and 3T/4-T, respectively.
A 0-T/4 cycle, wherein the voltage applied to the laminated piezoelectric ceramic b1 rises, the voltage applied to the laminated piezoelectric ceramic b2 falls, the laminated piezoelectric ceramic b1 extends, the b2 contracts, and the stator assembly moves from the D position to the A position;
a period of T/4-T/2, wherein the voltage applied to the laminated piezoelectric ceramic B1 is reduced, the voltage applied to the laminated piezoelectric ceramic B2 is reduced, the laminated piezoelectric ceramic B1 continues to extend, the laminated piezoelectric ceramic B2 extends, and the stator assembly moves from the A position to the B position;
the period of T/2 to 3T/4, the voltage applied to the laminated piezoelectric ceramic B1 continuously drops, the voltage applied to the laminated piezoelectric ceramic B2 rises, the laminated piezoelectric ceramic B1 contracts, the B2 continuously extends, and the stator assembly moves from the position B to the position C;
in the 3T/4-T cycle, the voltage applied to the laminated piezoelectric ceramic b1 increases, and the voltage applied to the laminated piezoelectric ceramic b2 increases, so that the laminated piezoelectric ceramic b1 continues to contract, b2 contracts, and the stator assembly moves from the C position to the D position.
When a sinusoidal voltage as shown in fig. 5 is applied to the laminated piezoelectric ceramics b1, b2, the driving legs a13, a14 of the stator assembly 11 make elliptical motions as shown in fig. 6. Because the stator 1 is of a symmetrical structure, the upper driving foot a13 of the stator assembly 11 moves clockwise from a 1-B1-C1-D1, the lower driving foot a14 of the stator assembly 11 moves counterclockwise from a 2-B2-C2-D2, and the driving feet a13 and a14 at the upper and lower ends push the rotor 4 to move from left to right.
When no electric signal is applied to the laminated piezoelectric ceramic, the left side and the right side of the stator assembly 11 and 12 are in an initial state; when an excitation signal with a phase sequentially delayed by 90 degrees is applied to the laminated piezoelectric ceramic, the motor moves to the position A at the T/4 moment, the stator assembly 11 pushes the rotor, and the stator 1 is separated from the rotor; at the moment of T/2, the motor moves to a position B, the stator assembly 11 continues to push the rotor but is about to finish the working cycle, and the stator 1 still does not contact the rotor but moves to the working cycle immediately; at the moment of 3T/4, the motor moves to the position C, the stator assembly 11 is separated from the rotor, and the stator 1 pushes the rotor; at time T, the motor moves to position D, the stator assembly 11 still does not contact the mover but moves to the working cycle immediately, and the stator 1 continues to push the mover but is about to finish the working cycle. The stator assemblies 11 and 12 alternately enter the elliptical tracks to push the rotor 4 in the first half period, and the driving feet are always kept in contact with the rotor 4, so that the rotor 1 can push the rotor 4 in the whole period, and the alternating driving of the double driving feet of the motor is realized.
The above, only be the preferred embodiment of the present invention, but the design concept of the present invention is not limited to this, and any skilled person familiar with the technical field is in the technical scope disclosed in the present invention, and it is right to utilize this concept to perform insubstantial changes to the present invention, all belong to the act of infringing the protection scope of the present invention.
Claims (10)
1. Alternate rowing boat form piezoelectricity linear electric motor, its characterized in that includes: the stator and the U-shaped outer frame thereof, the connecting block, the rotor and the elastic prepressing mechanism thereof and the base are arranged on the stator; the stator is fixedly connected in the U-shaped outer frame, and the lower frame and the connecting block of the U-shaped outer frame are fixed on the base through bolts; the elastic prepressing mechanism is arranged on two sides of the U-shaped outer frame along the width direction of the U-shaped outer frame and forms a certain gap with the U-shaped outer frame, and the contact flat plate of the rotor comprises a first part arranged in the gap and a second part lapped on the upper surface of the elastic prepressing mechanism; the elastic prepressing mechanism keeps the contact of the rotor and the stator under the action of prepressing force generated by elastic deformation;
the elastic prepressing mechanism is arranged on the base.
2. The alternating rowing piezoelectric linear motor of claim 1, wherein: the stator consists of a two-layer stator assembly; the two-layer stator assembly extends along the direction parallel to the upper frame and the lower frame and is fixedly connected with the upper frame and the lower frame respectively.
3. The alternating rowing piezoelectric linear motor of claim 2, wherein: the stator assembly comprises a displacement amplifying mechanism, two groups of laminated piezoelectric ceramics, a flexible support, a pre-tightening mechanism and a spherical cushion block;
when two groups of laminated piezoelectric ceramics are respectively applied with phase difference electric signals, two groups of driving feet of the stator assembly respectively vibrate in a closed track with a certain phase difference, so that the rotor is pushed to move.
4. The alternating rowing piezoelectric linear motor of claim 3, wherein: the displacement amplifying mechanism consists of a triangular amplifying arm, a flexible hinge and the driving foot;
the triangular amplifying arms are divided into two groups, and each group is provided with two triangular amplifying arms; one end of each of the two triangular amplifying arms in the same group is connected with the flexible hinge, and the other end of each of the two triangular amplifying arms is connected with the same driving foot.
5. The alternating rowing piezoelectric linear motor of claim 4, wherein: the two groups of laminated piezoelectric ceramics are arranged between the two groups of triangular amplifying arms along the length direction of the displacement amplifying mechanism; and one opposite sides of the two groups of laminated piezoelectric ceramics are respectively connected with the flexible supports through spherical cushion blocks.
6. The alternating rowing piezoelectric linear motor of claim 5, wherein: the top of the flexible support is connected with the spherical cushion block, the bottom of the flexible support is inserted into the lower frame or the upper frame of the U-shaped outer frame, and the whole stator assembly is fixed on the U-shaped outer frame by bolts;
there are two flexible hinges for the flexible support.
7. The alternating rowing piezoelectric linear motor of claim 6, wherein: the pre-tightening mechanism consists of a pre-tightening bolt, a cylindrical pressing block and a positioning pin;
when the pre-tightening bolt is tightened, the cylindrical pressing block is pushed to apply pre-tightening force to the laminated piezoelectric ceramic; the cylindrical pressing block is provided with a limiting groove, and the positioning pin is inserted into the limiting groove to limit the cylindrical pressing block along the circumferential direction, so that the cylindrical pressing block can only translate along the axial direction.
8. The alternating rowing piezoelectric linear motor of claim 1, wherein: one end of the upper frame and one end of the lower frame of the U-shaped outer frame are connected with each other through the middle frame.
9. The alternating rowing piezoelectric linear motor of claim 1, wherein: the rotor also comprises a contact flat plate and a rotor guide rail; the contact flat plate is in contact with the stator driving foot to transmit the friction force of the stator to the rotor; the rotor guide rail is arranged on the base, so that the rotor can do linear motion along the guide rail.
10. The alternating rowing piezoelectric linear motor of claim 1, wherein: the elastic prepressing mechanism consists of four prepressing brackets and two connecting plates; the connecting plates are respectively connected to the bottoms of the two preloading brackets; and the connecting plate is in sliding connection with the rotor guide rail.
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| CN202023282551.1U CN214591209U (en) | 2020-12-30 | 2020-12-30 | Alternate rowing type piezoelectric linear motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737401A (en) * | 2020-12-30 | 2021-04-30 | 华侨大学 | Alternate rowing type piezoelectric linear motor |
| CN115051596A (en) * | 2022-07-15 | 2022-09-13 | 华侨大学 | Four-bar linkage direct-pushing piezoelectric linear motor |
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2020
- 2020-12-30 CN CN202023282551.1U patent/CN214591209U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737401A (en) * | 2020-12-30 | 2021-04-30 | 华侨大学 | Alternate rowing type piezoelectric linear motor |
| CN112737401B (en) * | 2020-12-30 | 2024-06-07 | 华侨大学 | Alternate rowing type piezoelectric linear motor |
| CN115051596A (en) * | 2022-07-15 | 2022-09-13 | 华侨大学 | Four-bar linkage direct-pushing piezoelectric linear motor |
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