TWI555323B - Hybrid-type piezoelectric motor - Google Patents

Description

Compound piezoelectric motor (2)

The invention relates to a piezoelectric motor, and more particularly to a piezoelectric motor having high actuation force, high load capacity or high torque.

With the development of science and technology, all kinds of motors have been filled with the surrounding. Traditional motors are susceptible to magnetic field interference and noise. Therefore, scientists have developed piezoelectric motors to replace traditional high-noise motors. The electric motor has the advantages of being free from magnetic field interference, precise positioning, quietness and low noise, so that the piezoelectric motor has been widely used in equipment such as cameras and medical equipment. As technology evolves, the performance and shape or type of piezoelectric motors, including ultrasonic motors and ceramic motors, have also changed. The reason for this change is nothing more than the demand for speed, moving speed, torsion, thrust or load capacity of the opto-mechanical system.

Among them, the type of the piezoelectric motor can be classified into a translation type (or linear type) or a rotary type if it is distinguished by an output function. If it is distinguished by its energy transmission mode, the energy transmission mode of the piezoelectric motor of any type is almost transmitted by the friction between the stator and the rotor. As for the driving method, most of them are driven by the resonant frequency of the ultrasonic wave, so the piezoelectric motor can also be called an ultrasonic motor. However, there are also those who use low frequency or audio to drive, so the kind of motor called piezoelectric motor seems to be more appropriate. However, regardless of the piezoelectric motor driven by low frequency, audio or super audio, when the stator and the rotor are rubbed, the noise generated is mostly within the audio range that can be heard by the human ear. Therefore, the general opto-mechanical system is In addition to the design of the piezoelectric motor to have good rotational speed, moving speed, torque, thrust or load capacity, it must also consider how the opto-mechanical system is operating and how to reduce its noise value.

However, the piezoelectric motor currently developed can be designed according to the needs of the user, but in essence, it can only be a single spindle, and the following piezoelectric motors are respectively required according to the requirements of rotation speed, moving speed, torque, thrust or load capacity. :

1. Micro-ultrasonic motor developed by A.Kobayashi and T.Kanda in 2007. The size of the micro-ultrasonic motor is D1.8mm×L5.8mm, and its maximum speed is 9,600rpm; however, the torque is very high. The small, only 5.5μNm, we can find that the above-mentioned miniature ultrasonic motor has high speed performance, but the torque is very small.

2. The piezoelectric motor or ultrasonic motor has the fastest output or the fastest driving speed. It is a linear ultrasonic motor developed by Minoru Kuribayashi Kurosawa in 2009. Its fastest moving speed or driving speed is 1,500mm/s. Thrust or loading is 13N or 140N. The above-mentioned linear ultrasonic motor has good moving (or driving) speed or thrust (or load), but this type of piezoelectric motor or ultrasonic motor is quite large. Therefore, it is not suitable for use in micro or small optical electromechanical systems.

3. Furthermore, in 2010, the rotary ultrasonic motor developed by Yingxiang Liu, Weishan Chen, Junkao Liu and Shengjun ShiYingxiang Liu has a maximum torque of 9.5 Nm, but the rotational speed is only 58 rpm. The sonic motor still has the disadvantage of being too bulky.

4. Piezoelectric motors or ultrasonic motors have the largest output thrust or load capacity. The rotary ultrasonic motor developed by Yingxiang Liu, Weishan Chen, Junkao Liu and Shengjun ShiYingxiang Liu in 2010 has the maximum thrust or The load capacity is 500N, but the speed is only 58rpm. The above-mentioned miniature ultrasonic motor has high load capacity, but the speed is very slow.

In addition to the above problems, conventional piezoelectric motors still have the following drawbacks in terms of structure:

1. Conventional conventional piezoelectric motor energy conversion requires complex energy conversion energy, which easily leads to an increase in friction, which in turn affects output efficiency.

2. Conventional conventional piezoelectric motors are designed to be driven by high speed or high moving speed, which may result in the inability to drive heavy optical electromechanical transmission mechanisms or systems.

3. Traditionally, piezoelectric motors are designed to have a high torque or high load force as the design spindle, which tends to cause the speed to be too slow and cannot be applied to servo motors requiring high speed.

Therefore, in order to further effectively solve the disadvantage that the conventional piezoelectric motor has a high rotational speed but only low torque or high torque (or high load capacity), but the rotational speed is too low, the inventors have devoted themselves to research and proposed a composite piezoelectric. a motor (2) comprising: a piezoelectric stator, a stator, at least one axial piezoelectric ceramic group and a substrate, the stator having a through port and passing through a through hole and a shaft An axial piezoelectric ceramic group is screwed into one of the screw holes of the substrate, wherein the axial piezoelectric ceramic assembly includes an axial actuator that is superposed on the substrate, and is stacked in the axial direction a first bending actuating member of the actuating member, and a second bending actuating member superposed on the first bending actuating member; a rotor having a front end, a rear end, and a front end and the rear end a cavity, the shaft is passed through the cavity such that the rear end is in close contact with the opening of the stator, and the outer edge of the front end is provided with a driving unit; an elastic locking component is screwed on the shaft And pressing the rotor to provide a pre-stress of the piezoelectric stator and the rotor; By applying the high frequency power supply of the axial actuating member, the first bending actuating member and the second bending actuating member, the stator generates a highly actuating elliptical motion, thereby rotating the rotor.

Further, the shaft is further provided with a limiting baffle for pressing the axial piezoelectric ceramic group to the limit position.

Further, a bearing is sleeved on the shaft between the elastic locking component and the rotor.

Further, the elastic locking component comprises a restraining component, a screw and an elastic component interposed between the restraining component and the screw, and the restraining component is sleeved on the shaft and placed in the cavity, and The screw is screwed on the shaft, and the pre-stress is adjusted by the screwing and screwing of the screw.

Further, the port of the stator has a conical shape, and the rear end of the rotor has a conical shape with respect to the port of the stator, so that the port is closely adhered to the rear end.

Further, the axial actuator comprises at least one axial piezoelectric piece and at least one axial conductive piece, the axial conductive piece is coupled to the axial conductive piece, and further the first bending actuator comprises At least one first piezoelectric sheet and at least a first conductive sheet, the first conductive sheet is disposed on two sides of the first piezoelectric sheet, and further the second curved actuator includes at least one second piezoelectric a sheet and at least one second conductive sheet, wherein the second conductive sheet is coupled to the second piezoelectric sheet.

Further, the axial piezoelectric sheet, the axial conductive sheet, the first piezoelectric sheet, the first conductive sheet, the second piezoelectric sheet, and the second conductive sheet have a hollow circular shape.

Further, the same or different high frequency power sources are applied to the axial actuator, the first bending actuator and the second bending actuator, respectively.

Further, the driving unit is a gear or a pulley.

The effect of the invention is:

1. The present invention generates a highly actuating elliptical motion of the stator by applying a high frequency power source to the axial actuator, the first bending actuator and the second bending actuator that are superposed on each other. The rotor is rotated rapidly.

2. The present invention can control the rotation direction of the rotor by applying different driving voltages, frequencies and phase angles of the axial actuator, the first bending actuator and the second bending actuator, respectively. The clock or clockwise) makes the user's operation more flexible.

3. The invention has the advantages of simple structure, convenient disassembly or assembly, and strong and durable structure.

4. The present invention does not need to design a piezoelectric motor for a single demand (such as speed demand, moving speed demand, high load force demand or high torque demand, etc.), which can be achieved through geometric design and optimal driving mode. Piezoelectric motor with high torque and high speed output.

5. The invention is suitable for driving high-magnification optical lenses, high-load precision mechanical slides, other small optical electromechanical systems or other high-tech products.

6. The present invention has a low noise effect compared to conventional motors.

7. The invention is applied to a high-load precision mechanical slide rail, and the utility model can accurately provide the function of step positioning due to the use of the piezoelectric sheet to instantly deform.

(1)‧‧‧ Piezoelectric stator

(11) ‧‧‧ Stator

(111)‧‧‧ mouth

(12)‧‧‧Axial Piezoelectric Ceramics

(121)‧‧‧Axial Actuator

(121A)‧‧‧Axial Piezo Pieces

(121B)‧‧‧Axial conductive sheet

(122)‧‧‧First bending actuator

(122A)‧‧‧First Piezo Pieces

(122B)‧‧‧First conductive sheet

(123)‧‧‧Second bending actuator

(123A)‧‧‧Second Piezo

(123B)‧‧‧Second conductive sheet

(13)‧‧‧ shaft

(131) ‧ ‧ first end

(132)‧‧‧second end

(133)‧‧‧Limited blanks

(14) ‧‧‧Base

(2) ‧‧‧Rotor

(21) ‧‧‧ front end

(22) ‧‧‧ Backend

(23) ‧‧‧ cavity

(24)‧‧‧ Gears

(3) ‧‧‧Elastic locking components

(31) ‧ ‧ restraint components

(32)‧‧‧Spiral firmware

(321)‧‧‧ Nuts

(322) ‧‧‧shims

(33)‧‧‧Flexible components

(34) ‧ ‧ bearings

(4) ‧‧‧Optical lens gear

(A) ‧‧‧First set of high frequency power supplies

(B) ‧‧‧Second group of high frequency power supplies

(C) ‧‧‧The third group of high frequency power supplies

(1A) ‧‧‧Rotor of another embodiment

(2A)‧‧‧ drive unit

(21A)‧‧‧Rollers

(3A) ‧‧‧Support blocks

(4A) ‧‧‧Single slider

(5A)‧‧‧ Large area slider

[First figure] is a schematic exploded view of the three-dimensional structure of the present invention.

[Second figure] is an exploded schematic view of the axial piezoelectric ceramic set of the present invention.

[Third image] is a three-dimensional combination diagram of the present invention.

[Fourth figure] is a plan sectional view of the present invention.

[Fifth diagram] is a schematic diagram of applying high frequency piezoelectric to the present invention.

[Sixth] is a state diagram of the implementation of the present invention, and particularly describes an optical lens that is coupled to a camera.

[Seventh figure] is a state diagram of the implementation of the present invention, and particularly shows that the driving optical lens is moved out.

[Eighth Diagram] is a perspective combination diagram of another embodiment of the present invention.

[Ninth aspect] is a state diagram of an embodiment of another embodiment of the present invention, particularly for the purpose of transporting a slide rail, and conveying a single-piece slider.

[Tenth] is a state diagram of an implementation of another embodiment of the present invention, particularly for the purpose of transporting a slide rail, and conveying a large-area slider.

Embodiments of the Invention Referring to the first figure, the present invention includes a piezoelectric stator (1) including a stator (11), an axial piezoelectric ceramic group (12), and a substrate (14). Wherein: the stator (11) has a through port (111), the port (111) having a conical shape that tapers outwardly and passes through the stator (11) with a shaft (13) a port (11), wherein the shaft (13) includes a first end portion (131), a second end portion (132) portion, and the first end portion (131) and the second end portion a limiting piece (133) between the parts (132), the stator (11) is sleeved on the shaft (13), and the stator (11) is defined by the limiting piece (133) The position on the shaft (13).

Referring to the second figure, the axial piezoelectric ceramic group (12) is shown to include an axial actuator (121), a first bending actuator (122) and a second bending. a moving member (123), the axial actuator (121) is superposed on the base (14), and includes four axial piezoelectric sheets (121A) and four axial conductive sheets (121B) interlaced with each other Laminating and giving different electrodes to the front and back of each axial piezoelectric piece (121A), so that the axial actuating member (121) provides an axial vibration; and the first bending is actuated The member (122) includes four first piezoelectric sheets (122A) and five first conductive sheets (122B), and the first conductive sheets (122B) are interposed on the first piezoelectric sheets (122A). Both sides, away from the substrate (14) and superposed on the axial actuator (121), and each first piezoelectric piece (122A) is divided into upper and lower blocks, and then the next two The electrodes respectively have different electrodes, such that the first bending actuator (122) provides a horizontal vibration; the second bending actuator (123) further comprises four second piezoelectric sheets (123A) and Two conductive sheets (123B) are alternately overlapped with each other, and are away from the substrate (14) and superposed on the first bending actuator (122), and each second piezoelectric sheet (122A) is divided into left and right The block is further applied with different electrodes of the left and right blocks, so that the second bending actuating member (122) provides a vertical direction vibration. Thereby forming the series type of the axial actuating member (121), the first bending actuating member (122) and the second bending actuating member (123), the axial pressure of the series type An electric ceramic group (12) is sleeved on the second end portion (132) of the shaft (13), one end of which is abutted against the stator (11), and the other end is pressed against the base (14), The base plate (14) is screwed to the shaft (13) with a screw hole.

Please refer to the first to fourth figures at the same time, a rotor (2) having a front end (21), a rear end (22) and a cavity extending through the front end (21) and the rear end (22) a body (23), the rear end (22) of the rotor (2) exhibits an outwardly tapered cone corresponding to the opening (111) of the stator (11), and is sleeved on the shaft (13) One end portion (131) closely closes the opening (111) and the rear end (22) of the rotor (2), and the front end (21) of the rotor (2) is provided with a driving unit, the driving The unit is a gear (24) in this embodiment.

An elastic locking component (3) is sleeved on the first end portion (131) of the shaft (13), the elastic locking component (3) includes a restraining component (31) and a screw (32) And an elastic element (33) interposed between the restraining element (31) and the screw (32), wherein the restraining element (31) is sleeved on the shaft (13) and placed in the cavity ( 23), the screw (32) is screwed on the shaft (13); in the embodiment, the screw (32) is a nut (321) and a gasket (322), the screw The cap (321) can be screwed in and retracted on the shaft (13), thereby pressing the elastic member (33) to provide a pre-stress of the piezoelectric stator (1) and the rotor (2).

Furthermore, a bearing (34) is sleeved on the shaft between the restraining element (31) and the rotor (2), and the restraining element (31) abuts against the bearing (34) as the nut (321) when screwing in the direction of the rotor (2), the elastic member (33) receives a compression repulsive force from one of the nuts (321), and the compression rebound force is pushed to the bearing via the restraining member (31) (34), and further gaining the adhesion between the nut (321) and the shaft (13), so that the nut (321) can be released from the shaft (13) without being used for a long time. occur.

Referring to FIG. 5 again, the piezoelectric stator (1), the rotor (2) and the elastic locking component (3) are assembled on the shaft (13) and actuated in the axial direction. The member (121), the first bending actuator (122) and the second bending actuator (123) respectively apply the same or different high-frequency power sources, and the high-frequency power source includes a resonance frequency, a driving voltage and a phase angle, etc.; as shown in the figure, the user applies a first set of high frequency power (A) to the axial actuator (121) to cause the axial actuator (121) Generating the aforementioned axial vibration, and simultaneously applying a second set of high frequency power (B) and a third set of high frequency to the first bending actuator (122) and the second bending actuator (123) a power source (C) for causing the first bending actuator (122) to generate the aforementioned horizontal vibration, and the second bending actuator (123) to generate the aforementioned vertical vibration, thereby causing the stator (11) to produce an ellipse Shape vibration, to achieve rapid rotation And varying the direction of rotation (forward or reverse), resulting in a variety of different actuation properties. This embodiment does not need to design a piezoelectric motor for a single requirement (such as speed demand, moving speed demand, high load force demand or high torque demand, etc.), which can be achieved through the aforementioned geometric design and optimal driving mode. a piezoelectric motor having high torque and high speed output efficiency; further, by separately applying the axial actuator, the first bending actuator and the second bending actuator, different driving voltages, frequencies and The phase angle, in turn, controls the direction of rotation of the rotor (counterclock or clockwise), making the user more flexible.

In this embodiment, the stator (11) can be driven by the piezoelectric vibration to generate the elliptical vibration displacement or the torsion force to drive the rotor (2) to rotate, thereby further adapting the composite piezoelectric motor (2) of the present invention. Used to drive micro-movements of optical lenses, such as video systems, surveillance systems, optical systems, cameras, digital cameras, or simple piezoelectric optical lenses in camera phones. Referring to the sixth figure, the embodiment is applied to an optical lens. As shown in the figure, the rotor (2) is matched with an optical lens gear (24), and the two are moved in opposite directions. Referring to the seventh figure, when the user needs to move the optical lens, it is only necessary to apply the same or different high-frequency power to the stator (11) to cause the stator (11) to produce a piezoelectric effect. The rotor (2) is further pushed to extend the optical lens to achieve precise micro control technology.

Another embodiment of the present invention is shown in the eighth embodiment. The configuration of the second embodiment is the same as that of the first embodiment, and only the driving unit (2A) of the rotor (1A) is distinguished. 2A) is a roller (21A) in another embodiment, the use of which is suitable for linear slides in precision machinery, as shown in the ninth figure, the plurality of piezoelectric motors of the embodiment are supported by several The block (3A) is raised to a height, and then a single piece of slider (4A) is placed on the roller (21A); as shown in the tenth figure, By arranging the piezoelectric motors of the present embodiment in series and setting them in a multi-pass type, it is possible to transport a large-area slider (5A).

In view of the foregoing description of the embodiments, the operation and the use of the present invention and the effects of the present invention are fully understood, but the above described embodiments are merely preferred embodiments of the present invention, and the invention may not be limited thereto. </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

(1)‧‧‧ Piezoelectric stator

(11) ‧‧‧ Stator

(12)‧‧‧Axial Piezoelectric Ceramics

(13)‧‧‧ shaft

(131) ‧ ‧ first end

(132)‧‧‧second end

(133)‧‧‧Limited blanks

(14) ‧‧‧Base

(2) ‧‧‧Rotor

(21) ‧‧‧ front end

(22) ‧‧‧ Backend

(31) ‧ ‧ restraint components

(32)‧‧‧Spiral firmware

(321)‧‧‧ Nuts

(322) ‧‧‧shims

(33)‧‧‧Flexible components

(34) ‧ ‧ bearings

Claims (8)

A composite piezoelectric motor (2) comprising: a piezoelectric stator, a stator, at least one axial piezoelectric ceramic group and a substrate, the stator having a through port and passing through a shaft The through-port and the axial piezoelectric ceramic group are screwed into one of the screw holes of the base, wherein the axial piezoelectric ceramic set includes an axial actuating member and a stack stacked on the base a first bending actuating member coupled to the axial actuating member, and a second bending actuating member superposed on the first bending actuating member. In addition, the shaft is provided with a limiting baffle for The axial piezoelectric ceramic group is pressed against the limit; a rotor has a front end, a rear end, and a cavity extending through the front end and the rear end, the shaft passing through the cavity, the rear end and the rear end The through hole of the stator is closely combined, and a driving unit is disposed at an outer edge of the front end; an elastic locking component is screwed on the shaft and presses the rotor to provide a prestressing of the piezoelectric stator and the rotor High frequency power supply by applying the axial actuator, the first bending actuator and the second bending actuator The elliptical motion produced by the stator high actuation force, further rotation of the rotor. The composite piezoelectric motor (2) of claim 1, wherein a bearing is disposed on the shaft between the elastic locking component and the rotor. The composite piezoelectric motor (2) according to any one of claims 1 to 2, wherein the elastic locking component comprises a restraining component, a screw and a clamping member and the screw An elastic element between the firmware, the restraining element is sleeved on the shaft and disposed in the cavity, and the screw is screwed on the shaft, and the screw can be adjusted by screwing in and out of the shaft Prestressed size. The composite piezoelectric motor (2) of claim 1, wherein the through port of the stator has a conical shape, and the rear end of the rotor has a cone with respect to the port of the stator, so that the port Close to the back end. The composite piezoelectric motor (2) of claim 1, wherein the axial actuator comprises at least one axial piezoelectric piece and at least one axial conductive piece. The axial conductive sheet is coupled to the axial conductive sheet, and the first curved actuator comprises at least a first piezoelectric sheet and at least a first conductive sheet, wherein the first conductive sheet is disposed on the first piezoelectric sheet On both sides of the sheet, the second bending actuator further comprises at least one second piezoelectric sheet and at least one second conductive sheet, and the second conductive sheet is coupled to the second piezoelectric sheet. The composite piezoelectric motor (2) of claim 5, wherein the axial piezoelectric sheet, the axial conductive sheet, the first piezoelectric sheet, the first conductive sheet, and the second piezoelectric Both the sheet and the aforementioned second conductive sheet have a hollow circular shape. The composite piezoelectric motor (2) of claim 1 is applied to the same or different heights on the axial actuator, the first bending actuator and the second bending actuator, respectively. Frequency power supply. The composite piezoelectric motor (2) of claim 1, wherein the driving unit is a gear or a pulley.