CN103701358B - Balance weight type variable contact force piezoelectric motor - Google Patents
Balance weight type variable contact force piezoelectric motor Download PDFInfo
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- CN103701358B CN103701358B CN201310446481.4A CN201310446481A CN103701358B CN 103701358 B CN103701358 B CN 103701358B CN 201310446481 A CN201310446481 A CN 201310446481A CN 103701358 B CN103701358 B CN 103701358B
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Abstract
The invention discloses a kind of balance weight type variable contact force piezoelectric motor, comprise piezoelectrics and movement parts, the elastic-restoring force that described piezoelectrics are produced by elasticity prestressing elements and movement parts touch, the elastic telescopic direction of this elasticity prestressing elements and the start direction of piezoelectric motor perpendicular; Meanwhile, described piezoelectrics and horizontal pedestal hinged, and the connection line between piezoelectrics and horizontal pedestal is parallel to the start direction of piezoelectric motor.Therefore, it is large that piezoelectric motor of the present invention has thrust, Long Distances, can bidirectional-movement, and the life-span is long, possesses the function that cuts off self-lock simultaneously.
Description
Technical field
The present invention relates to a kind of piezoelectric motor, belong to Precision Piezoelectric actuation technology field.
Background technology
Electric energy conversion can be mechanical energy by the inverse piezoelectric effect of piezoelectric ceramic, and the actuator of effect design accordingly has structure simply, and Electro Magnetic Compatibility is good and respond the features such as fast.
Distortion due to piezoelectric ceramic exports the impact of excited target electric field and stiffness by itself, and be the convenience of use and the practicality of electric excitation, be generally the laminated structure of similar plane-parallel capacitor, its output skew is very little.In order to this small distortion being converted into the macroscopic motion of moving object, the technology of usual employing has two kinds: one to be by stacking for multi-disc piezoelectric ceramic, the mode of circuit in parallel is adopted to be made into integrated component, also stacked piezoelectric pottery is, this device can export larger strain (being generally 0.1%) under small voltage, and this technology can be used in stroke in the precise jiggle mechanism of tens microns of strokes.Two is the resonance utilizing structure, makes piezoelectric element be operated in high-frequency resonance state, thus obtains micron order displacement output, and micron order vibration is converted into the unidirectional macroscopic motion of moving object by the mode be coupled by rubbing, and common application sees ultrasound electric machine.
Stacked piezoelectric pottery has the feature of high thrust, for overcoming the restriction of its stroke, there is the piezoelectricity stepping motor also adopting alternately clamp mode work with stacked piezoelectric pottery as power source, this kind of motor can have unlimited stroke while thrust output, unlimited closed loop location resolution can also be obtained, owing to adopting the mode of stiction coupling to export step motion, this actuator has larger thrust than adopting the ultrasound electric machine of force of sliding friction coupled modes.But prior art has following three technical barriers:
First, two clamp units realizing alternately clamp separate and the two between apart from each other, this requires that the depth of parallelism of guiding mechanism is enough high, under prior art condition, it is very difficult that two guide rails realizing longer distance have the higher depth of parallelism, needs higher cost of manufacture;
The second, the distance between existing guiding mechanism is fixing, and the wearing and tearing at clamp units two ends cannot realize clamp by finally causing, and causes losing efficacy;
3rd, when all stacked piezoelectrics pottery all power-off, the coupling mechanism force between clamp units and closed slide much smaller than the coupling mechanism force of clamp units locking closed slide, the therefore ability that almost do not cut off self-lock of Inchworm type clamp step piezoelectric motor.
Summary of the invention
The object of the invention is to: propose a kind of balance weight type variable contact force piezoelectric motor, it is large that it has thrust, Long Distances, can bidirectional-movement, and the life-span is long, possesses the function that cuts off self-lock simultaneously.
The present invention realizes by the following method:
A kind of balance weight type variable contact force piezoelectric motor, comprises piezoelectrics and movement parts, and the elastic-restoring force that described piezoelectrics are produced by elasticity prestressing elements and movement parts touch, the elastic telescopic direction of this elasticity prestressing elements and the start direction of piezoelectric motor perpendicular; Meanwhile, described piezoelectrics and horizontal pedestal hinged, and the connection line between piezoelectrics and horizontal pedestal is parallel to the start direction of piezoelectric motor.
Described piezoelectrics comprise mover head, horizontal piezoelectric stack and longitudinal piezoelectric stack; Described horizontal piezoelectric stack, longitudinal piezoelectric stack include longitudinal vibration piezoelectric ceramic piece, and the longitudinal vibration piezoelectric ceramic piece stacking direction of horizontal piezoelectric stack is parallel with the start direction of piezoelectric motor, and the longitudinal vibration piezoelectric ceramic piece stacking direction of described longitudinal piezoelectric stack is vertical with the start direction of piezoelectric motor; One end of described horizontal piezoelectric stack is fixedly connected with mover head, and the other end is then hinged with horizontal pedestal; One end of described longitudinal piezoelectric stack is fixedly connected with mover head, and the other end is then connected with longitudinal pedestal by elasticity prestressing elements.
Described elasticity prestressing elements comprises the first spring, mass and the second spring, and described longitudinal piezoelectric stack is connected with longitudinal pedestal by the first spring, mass and the second spring successively.
Described elasticity prestressing elements comprises the first spring, mass and the second spring, and described longitudinal piezoelectric stack is by the first spring overhanging mass block, and described longitudinal piezoelectric stack is directly connected with longitudinal pedestal by the second spring simultaneously.
Horizontal piezoelectric stack and longitudinal piezoelectric stack respectively rate of connections are identical and have the two-phase sine voltage signal of pi/2 phase difference.
beneficial effect:
According to above technical scheme, relative to prior art, the present invention has the following advantages:
1, driving foot of the present invention is pressed in movement parts when power-off by Flexible Connector, and therefore, this structure causes piezoelectric motor that the present invention tells to have the function that cuts off self-lock;
2, the Flexible Connector that clamper power when piezoelectrics of the present invention (mover head) work is arranged by pretension provides, therefore, even if after driving foot to cause wearing and tearing because of Long-Time Service, piezoelectric motor also can normally work, so the present invention greatly can improve the useful life of piezoelectric motor;
3, the frictional force between piezoelectrics of the present invention (mover head) and movement parts can with the vibration realizing size variation of mass.Increase in mover head actuation movement part advancement stage frictional force, when the setback of mover head, frictional force reduces, and improves drive efficiency;
4, only need change a driving voltage phase place during piezoelectric motor work of the present invention and can realize counter motion;
5, piezoelectric motor structure of the present invention is simple, compact, is easy to realize mass production.
Accompanying drawing explanation
Fig. 1 is piezoelectric motor schematic diagram of the present invention.
Fig. 2 is that the another kind of piezoelectric motor of the present invention arranges schematic diagram.
In Fig. 1 to Fig. 2: 1-movement parts; 2-piezoelectric stack; 3-mover head; 4-mass.
Embodiment
Accompanying drawing discloses the structural representation of preferred embodiment involved in the present invention without limitation; Technical scheme of the present invention is explained below with reference to accompanying drawing.
As depicted in figs. 1 and 2, balance weight type variable contact force piezoelectric motor of the present invention, comprise piezoelectrics and movement parts, the elastic-restoring force that described piezoelectrics are produced by elasticity prestressing elements and movement parts touch, in accompanying drawing, described piezoelectrics are connected with longitudinal pedestal by elasticity prestressing elements, the elastic telescopic direction of this elasticity prestressing elements and the start direction of piezoelectric motor perpendicular; Meanwhile, described piezoelectrics and horizontal pedestal hinged, and the connection line between piezoelectrics and horizontal pedestal is parallel to the start direction of piezoelectric motor.Described piezoelectrics comprise mover head, horizontal piezoelectric stack and longitudinal piezoelectric stack; Described horizontal piezoelectric stack, longitudinal piezoelectric stack include longitudinal vibration piezoelectric ceramic piece, and the longitudinal vibration piezoelectric ceramic piece stacking direction of horizontal piezoelectric stack is parallel with the start direction of piezoelectric motor, and the longitudinal vibration piezoelectric ceramic piece stacking direction of described longitudinal piezoelectric stack is vertical with the start direction of piezoelectric motor; One end of described horizontal piezoelectric stack is fixedly connected with mover head, and the other end is then hinged with horizontal pedestal; One end of described longitudinal piezoelectric stack is fixedly connected with mover head, and the other end is then connected with longitudinal pedestal by elasticity prestressing elements.Wherein, Fig. 1 discloses the version of a kind of elasticity prestressing elements of the present invention, this elasticity prestressing elements comprises the first spring, mass and the second spring, and described longitudinal piezoelectric stack is connected with longitudinal pedestal by the first spring, mass and the second spring successively; Fig. 2 discloses the version of another kind of elasticity prestressing elements of the present invention, this elasticity prestressing elements comprises the first spring, mass and the second spring, described longitudinal piezoelectric stack is by the first spring overhanging mass block, and described longitudinal piezoelectric stack is directly connected with longitudinal pedestal by the second spring simultaneously.
Natch, piezoelectrics of the present invention are not limited to the version disclosed in accompanying drawing, in fact, only need after piezoelectrics energising, the one side that the direction of vibration produced is vertical with piezoelectric motor start direction is fixed with longitudinal pedestal, and produce the direction of vibration one side parallel with piezoelectric motor start direction and fix with horizontal pedestal, all in technical conceive of the present invention.
Operation principle of the present invention is as follows:
Two-phase frequency is applied identical, the sinusoidal signal of constant phase difference to horizontal and vertical stacked piezoelectric pottery.Now, longitudinal stacked piezoelectric pottery is as exciting element, and the vibration of excitation mass, lateral stack piezoelectric ceramic, as driving element, promotes movement parts motion.In an actuation cycles T, the action sequence of motor is as follows:
At 0-T/4, longitudinal stacked piezoelectric pottery excitation mass upwards vibrates, and between mover head and movement parts, normal pressure increases, and causes the frictional force of mover head and movement parts contact-making surface to increase;
At T/4-T/2, lateral stack piezoelectric ceramic extends, and mover head is to the motion of stacked piezoelectric pottery prolonging direction, and due to the effect of frictional force, mover head promotes movement parts and it moves to equidirectional;
T/2-3T/4, mass vibrates downwards, and mover head and movement parts do disengaging movement, and the normal pressure of contact-making surface disappears, and frictional force also disappears thereupon;
T3/4-T, lateral stack piezoelectric ceramic shortens, and drives the rightabout motion that mover head moves to movement parts, and due to zerofriction force between mover head and movement parts, movement parts keeps not moving.
Repeat by above-mentioned sequential, promotion movement parts is moved continuous one-way movement by piezoelectric motor.
Change the phase place of two phase voltages, the counter motion of movement parts can be realized.
Claims (4)
1. a balance weight type variable contact force piezoelectric motor, comprise piezoelectrics and movement parts, it is characterized in that: the elastic-restoring force that described piezoelectrics are produced by elasticity prestressing elements and movement parts touch, the elastic telescopic direction of this elasticity prestressing elements and the start direction of piezoelectric motor perpendicular; Meanwhile, described piezoelectrics and horizontal pedestal hinged, and the connection line between piezoelectrics and horizontal pedestal is parallel to the start direction of piezoelectric motor; Described piezoelectrics comprise mover head, horizontal piezoelectric stack and longitudinal piezoelectric stack; Described horizontal piezoelectric stack, longitudinal piezoelectric stack include longitudinal vibration piezoelectric ceramic piece, and the longitudinal vibration piezoelectric ceramic piece stacking direction of horizontal piezoelectric stack is parallel with the start direction of piezoelectric motor, and the longitudinal vibration piezoelectric ceramic piece stacking direction of described longitudinal piezoelectric stack is vertical with the start direction of piezoelectric motor; One end of described horizontal piezoelectric stack is fixedly connected with mover head, and the other end is then hinged with horizontal pedestal; One end of described longitudinal piezoelectric stack is fixedly connected with mover head, and the other end is then connected with longitudinal pedestal by elasticity prestressing elements.
2. balance weight type variable contact force piezoelectric motor according to claim 1, it is characterized in that: described elasticity prestressing elements comprises the first spring, mass and the second spring, described longitudinal piezoelectric stack is connected with longitudinal pedestal by the first spring, mass and the second spring successively.
3. balance weight type variable contact force piezoelectric motor according to claim 1, it is characterized in that: described elasticity prestressing elements comprises the first spring, mass and the second spring, described longitudinal piezoelectric stack is by the first spring overhanging mass block, and described longitudinal piezoelectric stack is directly connected with longitudinal pedestal by the second spring simultaneously.
4. balance weight type variable contact force piezoelectric motor according to claim 1, is characterized in that: horizontal piezoelectric stack and longitudinal piezoelectric stack respectively rate of connections are identical and have the two-phase sine voltage signal of pi/2 phase difference.
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| CN201310446481.4A CN103701358B (en) | 2013-09-26 | 2013-09-26 | Balance weight type variable contact force piezoelectric motor |
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| CN201310446481.4A CN103701358B (en) | 2013-09-26 | 2013-09-26 | Balance weight type variable contact force piezoelectric motor |
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| CN103701358A CN103701358A (en) | 2014-04-02 |
| CN103701358B true CN103701358B (en) | 2016-02-17 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743387B (en) * | 2016-03-30 | 2017-07-11 | 南京航空航天大学 | Alternating step piezoelectric linear electric motors based on lever amplification |
| CN107040162B (en) * | 2017-06-07 | 2019-02-05 | 盐城工学院 | A kind of piezoelectric motor and motor energization method |
| CN107154748B (en) * | 2017-06-07 | 2019-02-05 | 盐城工学院 | A kind of piezoelectric motor and Differential Control method |
| CN107040163B (en) * | 2017-06-08 | 2019-05-21 | 盐城工学院 | A kind of step-by-step movement miniature piezoelectric motors and its working method |
| CN106998156B (en) * | 2017-06-08 | 2019-05-21 | 盐城工学院 | A kind of differential type linear piezoelectric motor and its working method |
| CN110061654B (en) * | 2019-04-25 | 2020-09-25 | 宁波大学 | Variable pretightening force stick-slip inertia linear driver for friction regulation of special-shaped texture |
| CN109921680B (en) * | 2019-04-25 | 2020-06-02 | 宁波大学 | Variable-pretightening-force stick-slip inertia linear driver |
| CN110224632B (en) * | 2019-06-27 | 2024-02-27 | 华侨大学 | Friction force controllable linear piezoelectric actuator and control method thereof |
| CN110233584B (en) * | 2019-06-27 | 2024-02-02 | 华侨大学 | Counterweight stepping mechanism |
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| US6903494B2 (en) * | 2001-04-13 | 2005-06-07 | Nec Corporation | Actuator optical fiber moving apparatus, and optical switch |
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| KR20070101511A (en) * | 2006-04-11 | 2007-10-17 | 엘지전자 주식회사 | Micro piezoelectric linear motor |
| CN101071995A (en) * | 2007-06-14 | 2007-11-14 | 南京航空航天大学 | Dual-driving foot longitudinal-vibration mode stacked linear ultrasonic motor and working mode and electric exciting manner |
| CN201656810U (en) * | 2010-01-14 | 2010-11-24 | 南京航空航天大学 | K-shaped linear ultrasonic motor clamping and positioning device based on continuous amplitude transformer principle |
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2013
- 2013-09-26 CN CN201310446481.4A patent/CN103701358B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6903494B2 (en) * | 2001-04-13 | 2005-06-07 | Nec Corporation | Actuator optical fiber moving apparatus, and optical switch |
| CN1777011A (en) * | 2005-12-07 | 2006-05-24 | 南京航空航天大学 | Linear motion stepping ultrasonic motor |
| KR20070101511A (en) * | 2006-04-11 | 2007-10-17 | 엘지전자 주식회사 | Micro piezoelectric linear motor |
| CN101071995A (en) * | 2007-06-14 | 2007-11-14 | 南京航空航天大学 | Dual-driving foot longitudinal-vibration mode stacked linear ultrasonic motor and working mode and electric exciting manner |
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