TWI482416B - Composite piezoelectric motor - Google Patents

Description

Composite piezoelectric motor

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, whether using low frequency, audio or super audio The piezoelectric motor that is driven, when the stator and the rotor are rubbed, the noise generated by the piezoelectric motor is mostly within the audio range that can be heard by the human ear. Therefore, in general, the opto-mechanical system must be designed in addition to the good speed, moving speed, torsion, thrust or load capacity of the piezoelectric motor. 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. In addition, the rotary ultrasonic motor developed by Yingxiang Liu, Weishan Chen, Junkao Liu and Shengjun ShiYingxiang Liu in 2010, the most The large torque is 9.5 Nm, but the speed is only 58 rpm. Such piezoelectric motors or ultrasonic motors still have the disadvantage of being too bulky.

4. Piezoelectric motor or ultrasonic motor has the largest output thrust or load capacity. It is a rotary ultrasonic motor developed by Yingxiang Liu, Weishan Chen, Junkao Liu and Shengjun ShiYingxiang Liu in 2010. Its maximum thrust or load capacity. It 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. The motor includes: a piezoelectric stator, a stator, at least one axial piezoelectric ceramic set, and a base having a through port through which a shaft passes through the through hole and the axial piezoelectric a ceramic group, and is screwed into one of the screw holes of the base, wherein the stator surface is attached with a plurality of piezoelectric sheets; a rotor having a front end and a rear end and a cavity extending through the front end and the rear end, the shaft passing through the cavity, the rear end being in close contact with the opening of the stator, and the front end The outer edge is provided with a driving unit; an elastic locking component is screwed on the shaft and presses the rotor to provide a pre-stress of the piezoelectric stator and the rotor; and the piezoelectric piece and the shaft are applied A high frequency power supply to the piezoelectric ceramic group causes the stator to produce a highly actuating elliptical motion, which in turn rotates 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 piezoelectric ceramic assembly comprises at least one piezoelectric ceramic sheet and a plurality of conductive sheets, and the conductive sheets are disposed on both sides of the piezoelectric ceramic sheet.

Further, the piezoelectric ceramic sheet and the conductive sheet have a hollow circular shape.

Further, the same or different high frequency power sources are respectively applied to each of the axial piezoelectric ceramic groups and the piezoelectric sheets.

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

The effect of the invention is:

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

2. 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), which can be achieved through geometric design and optimal driving mode. Piezoelectric motor with high torque and high speed output.

3. The present invention generates a highly actuating elliptical motion by applying a high frequency power supply of a piezoelectric piece and an axial piezoelectric ceramic group, thereby rotating the rotor to drive the electromechanical system to produce a translational or rotational effect. .

4. The invention can be applied to optical lenses that drive high magnification, precision mechanical slides with high load, other small optical electromechanical systems or other high-tech products.

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

6. 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

(112) ‧ ‧ flat surface

(113)‧‧‧ Piezo Pieces

(12)‧‧‧Axial Piezoelectric Ceramics

(121)‧‧‧ Piezoelectric ceramic sheets

(122)‧‧‧Conductor

(13) ‧‧‧Base

(14)‧‧‧ shaft

(141) ‧ ‧ first end

(142) ‧ ‧ second end

(143)‧‧‧Limited stop

(2) ‧‧‧Rotor

(21) ‧‧‧ front end

(211)‧‧‧ drive unit

(211A)‧‧‧ Gears

(211B)‧‧‧Rollers

(22) ‧‧‧ Backend

(23) ‧‧‧ cavity

(3) ‧‧‧Elastic locking components

(31) ‧ ‧ restraint components

(32)‧‧‧Spiral firmware

(321)‧‧‧ Nuts

(322) ‧‧‧shims

(33)‧‧‧Flexible components

(4) ‧ ‧ bearings

(A) ‧ ‧ optical lens gear

(B) ‧ ‧ support blocks

(C) ‧‧‧Single slider

(D)‧‧‧ Large area slider

[First figure] is an exploded perspective view of the structure of the present invention.

[Second figure] is a perspective assembled view of the first embodiment of the present invention.

[Third Figure] is a cross-sectional view showing the structure of the present invention.

[Fourth figure] is a schematic diagram of electrically connecting a plurality of different high frequency power sources according to the present invention.

[Fifth A] is a schematic view of the optical lens before the opening of the first embodiment of the present invention.

[Fig. 5B] is a schematic view showing the optical lens of the first embodiment of the present invention after being turned on.

[Sixth Drawing] is a perspective assembled view of a second embodiment of the present invention.

[Seventh A] is a slider applied to a single piece on a linear slide according to a second embodiment of the present invention.

[Seventh B] is a slider for a large area on a linear slide according to a second embodiment of the present invention.

The first embodiment of the present invention is shown in the first to third figures. The present invention includes a piezoelectric stator (1) including: a stator (11) and an axis. a piezoelectric ceramic group (12) and a substrate (13), wherein: the stator (11) has a through port (111), and the port (111) has a conical shape which is outwardly divergent. The surface ring of the stator (11) is provided with four flat faces (112), and each flat face (112) is covered with a piezoelectric piece (113). Passing a shaft (14) through the opening (111) of the stator (11), wherein the shaft (14) includes a first end portion (141), a second end portion (142) portion and a setting a limiting block (143) between the first end portion (141) and the second end portion (142), the stator (11) is sleeved on the shaft (14), and A limit stop (143) defines the position of the stator (11) on the shaft (14).

Furthermore, in the first embodiment, the axial piezoelectric ceramic group (12) comprises four piezoelectric ceramic sheets (121) having a hollow circular shape and five hollow circular conductive sheets (122), wherein The conductive sheet (122) is attached to both sides of each piezoelectric ceramic piece (121), thereby forming a series connection mode of the piezoelectric ceramic piece (121) and the conductive piece (122). The axial piezoelectric ceramic group (12) of the series type is sleeved on The second end portion (142) of the shaft (14) has one end that abuts against the stator (11), and the other end is pressed against the base (13), and the base (13) has a screw hole It is arranged on the shaft (14).

a rotor (2) having a front end (21), a rear end (22) and a cavity (23) penetrating the front end (21) and the rear end (22), the rotor (2) rear end (22) Corresponding to the opening (111) of the stator (11), the outwardly tapered cone is disposed, and is sleeved on the first end portion (141) of the shaft (14), so that the opening (111) Closely in close contact with the rear end (22) of the rotor (2), and the front end (21) of the rotor (2) is provided with a driving unit (211), which is in the first embodiment For a gear (211A).

An elastic locking component (3) is sleeved on the first end (141) of the shaft (14), the elastic locking component (3) includes a restraining component (31), 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 (14) and placed in the cavity (23) The screw (32) is screwed to the shaft (14); in the first embodiment, the screw (32) is a nut (321) and a gasket (322), the screw The cap (321) can be screwed in and out of the shaft (14), thereby pressing the elastic member (33) to provide a pre-stress of the piezoelectric stator (1) and the rotor (2).

Furthermore, a bearing (4) is sleeved on the shaft between the restraining element (31) and the rotor (2), and the restraining element (31) abuts against the bearing (4) as the nut (321) when the screw (2) is screwed 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 passes through the restraining member (31) pushing against the bearing (4), thereby gaining the tightness of the nut (321) and the shaft (14), so that the nut (321) can be free from the shaft due to long-term use. (14) The situation of loosening occurs.

Referring to the fourth figure, the piezoelectric stator (1), the rotor (2) and the elastic locking component (3) are assembled on the shaft (14), and each piezoelectric ceramic The same or different high-frequency power sources are respectively applied to the chip (121) and each of the piezoelectric plates (113), and the high-frequency power source includes a resonant frequency, a driving voltage and a phase angle, etc.; When the electric ceramic piece (121) and the piezoelectric piece (113) are externally supplied with the high-frequency power source, the piezoelectric ceramic piece (121) and the piezoelectric piece (113) generate an inverse piezoelectric effect by telecommunications. The number is converted into mechanical energy, which in turn causes the stator (11) to produce an elliptical vibrational displacement or torsion force. By the stator (11) being tightly coupled to the rotor, the mechanical energy generated by the stator (11) is used to rotate the rotor. Produces 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. Piezoelectric motor with high torque and high speed output.

The first embodiment of the present invention can utilize the elliptical vibration displacement or torsion generated by the piezoelectric effect of the stator (11) to drive the rotor (2) to rotate, thereby further combining the piezoelectric motor of the present invention. Suitable for micro-movements that drive optical lenses, such as video systems, surveillance systems, optical systems, cameras, digital cameras, or simple piezoelectric optical lenses in camera phones. Referring to FIG. 5A, the first embodiment is applied to an optical lens, as shown in the figure, the rotor (2) and the teeth of an optical lens. The wheel (A) fits in and the two move in the opposite direction. Referring to FIG. 5B, when the user needs to move the optical lens, it is only necessary to apply the same or different high frequency power to the piezoelectric stator (1), and the piezoelectric stator (1) is generated. The piezoelectric effect, in turn, pushes the rotor (2) to extend the optical lens to achieve precise micro-control technology.

Referring to the sixth embodiment of the present invention, the configuration of the second embodiment is the same as that of the first embodiment, and only the driving unit (211) of the rotor (2) is distinguished. 211) is a roller (211B) in the second embodiment, and its use is applied to a linear slide in a precision machine. As shown in FIG. 7A, the plurality of piezoelectric motors of the embodiment are several. The support block (B) is raised to a height, and then a single piece of the slider (C) is placed on the roller (211B); as shown in the seventh figure B, the piezoelectric motor of the embodiment is connected in series. By arranging the modes and setting them into a multi-channel type, it is possible to transport a large area slider (D).

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;

(11) ‧‧‧ Stator

(113)‧‧‧ Piezo Pieces

(12)‧‧‧Axial Piezoelectric Ceramics

(13) ‧‧‧Base

(211A)‧‧‧ Gears

(32)‧‧‧Spiral firmware

(321)‧‧‧ Nuts

(322) ‧‧‧shims

(33)‧‧‧Flexible components

Claims (9)

A composite piezoelectric motor includes: a piezoelectric stator, a stator, at least one axial piezoelectric ceramic set, and a base having a through port through which a shaft passes and The axial piezoelectric ceramic group is screwed into one of the screw holes of the base, wherein the stator surface is attached with a plurality of piezoelectric sheets; a rotor having a front end, a rear end, and the front end and the rear end a cavity of the end, the shaft is passed through the cavity, 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 cavity a shaft and abutting the rotor for providing a pre-stress of the piezoelectric stator and the rotor; and applying a high frequency power to the piezoelectric piece and the axial piezoelectric ceramic group to generate high actuation force of the stator The elliptical motion then turns the rotor. The composite piezoelectric motor according to claim 1, wherein the shaft is further provided with a limiting baffle for pressing the axial piezoelectric ceramic group to the limit position. The composite piezoelectric motor according to claim 1, wherein a bearing is disposed on the shaft between the elastic locking component and the rotor. The composite piezoelectric motor according to any one of claims 1 to 3, wherein the elastic locking component comprises a restraining component, a screw, and the restraining component and the screw One of the elastic members, the restraining member is sleeved on the shaft and placed in the cavity, and the screw is screwed on the shaft, and the screw can be adjusted by screwing in and out of the screw. The magnitude of the stress. The composite piezoelectric motor according to 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 is The back end is closely packed. The composite piezoelectric motor according to claim 1, wherein the axial piezoelectric ceramic component comprises at least one piezoelectric ceramic piece and a plurality of conductive materials. The conductive sheet is disposed on both sides of the piezoelectric ceramic sheet. The composite piezoelectric motor according to claim 6, wherein the piezoelectric ceramic sheet and the conductive sheet have a hollow circular shape. The composite piezoelectric motor according to claim 1, wherein the same or different high-frequency power source is applied to each of the axial piezoelectric ceramic groups and the piezoelectric sheets. The composite piezoelectric motor of claim 1, wherein the driving unit is a gear or a pulley.