CN102751904B - Clamping device of antifriction drive-type ultrasonic motor - Google Patents

Abstract

The invention discloses a clamping device of an antifriction drive-type ultrasonic motor, and the clamping device is used for clamping a stator, and the clamping device comprises a fixed base and an elastic front end cover, wherein the elastic front end cover comprises an end cover plate for installing the stator and an elastic supporting assembly, the elastic supporting assembly is arranged between the end cover plate and the fixed base, and the end cover plate is locked with the fixed base through an adjustable tightening connecting piece. The clamping device is not only convenient for adjusting precompression between the stator/a rotor, but also can maintain the motor output power stable. The clamping device has characteristics of simplicity in structure and convenience in installation and adjustment.

Description

Clamping device for anti-friction driven ultrasonic motor

technical field

The invention relates to a stator clamping device, in particular to a clamping device for clamping and positioning a friction-reducing driving type ultrasonic motor stator assembly, belonging to the field of ultrasonic motors.

Background technique

Ultrasonic motor is a new type of actuator that uses the inverse piezoelectric effect of piezoelectric ceramics to excite ultrasonic vibrations and is driven by friction. The rotary ultrasonic motor is a kind of ultrasonic motor. Compared with traditional electromagnetic motors, ultrasonic motors have the advantages of large torque-to-mass ratio, fast response, precise positioning, and no electromagnetic interference. They have broad application prospects in the fields of biomedicine, precision drives, optical devices, and aerospace. the

The clamping device of the ultrasonic motor has a significant impact on the working stability and output power of the motor. A good clamping device design can provide stable support and convenient pre-pressure adjustment for the motor stator without affecting the working mode of the ultrasonic motor. Application No. 201010556066.0 discloses a linear ultrasonic motor clamping and positioning device, which adopts a flexible cantilever clamping structure, solves the complex mechanism design required by the use of springs, and simplifies the overall mechanism of the ultrasonic motor. Application No. 201010556088.7 discloses a clamping and positioning device for linear ultrasonic motors based on flexible hinges, which uses clamps with flexible hinges to install the stator, which also simplifies the motor adjustment mechanism and improves the output power and stability of the motor. However, for ultrasonic motors with different shapes and driving modes, the clamping mechanism is different, and it needs to be designed according to specific problems.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a clamping device for an anti-friction driven ultrasonic motor, which not only facilitates the adjustment of the pre-pressure between the stator and the mover, but also keeps the output power of the motor stable. The clamping device has the characteristics of simple structure and convenient installation and adjustment.

For realizing above technical purpose, the present invention will take following technical scheme:

A clamping device for an anti-friction driven ultrasonic motor, used for clamping a stator, including a fixed base and an elastic front cover, the elastic front cover includes an end cover plate for installing the stator and an elastic support assembly, the elastic support assembly It is placed between the end cover plate and the fixed base, and the end cover plate is locked with the fixed base through an adjustable fastening connector.

The elastic support assembly includes a fixed plate and an elastic support thin wall; there are at least two elastic support thin walls, one end of each elastic support thin wall is connected to the fixed plate, and the other end is movable, and the movable end of each elastic support thin wall is connected to the The end cover plates are in contact; the fixed plate is connected with the fixed base as a whole.

The elastic supporting thin wall is arrow-shaped or semi-circular arc-shaped.

The center of the fixing plate is provided with a threaded hole, and the fixing plate is fastened to the fixing base through the threaded hole by a threaded fastener, and each elastic supporting thin wall is evenly distributed around the threaded hole on the fixing plate.

The fixed base is fixedly connected to one end of the support plate, and the other end of the support plate is provided with a limit end ear, the elastic front end cover is placed between the limit end ear and the fixed base, and the limit end ear is connected by adjustable fastening The elastic front cover and the fixed base are locked by a piece.

The end cover plate includes an end cover plate body, the end cover plate body is provided with an open accommodation cavity for placing the elastic support assembly, and the open end of the accommodation cavity is provided with an installation ear; one end of the elastic support assembly is connected to the open The closed end of the opening receiving cavity touches, and the other end passes through the open end of the open receiving cavity and is connected with the fixed base; the mounting ear is locked with the fixed base through an adjustable fastening connector.

The adjustable fastening member is an adjusting bolt or an adjusting screw.

According to above technical scheme, the present invention will realize following beneficial effect:

1. It avoids the structural design of complex peripheral components such as springs and guide rails, simplifies the motor pre-pressure adjustment mechanism, and reduces the influence of the contact between redundant components and the stator on the working mode of the stator;

2. The elastic support thin wall and the design of the positioning groove of the fixed plate help to increase the vibration amplitude of the stator in the rated working mode, and improve the transmission characteristics of the dynamic contact force between the stator and the mover, thereby increasing the output power.

Description of drawings

Fig. 1 is a kind of structural representation of clamping device described in the present invention;

Fig. 2 is a schematic structural view of the elastic front end cover in Fig. 1;

Fig. 3 is a schematic diagram of the three-dimensional structure of the anti-friction driven ultrasonic motor using the clamping device described in Fig. 1;

1 to 3: 1, stator; 2, mover; 3, elastic front end cover; end cover plate 31; stator mounting hole 311; elastic support thin wall 321; fixed plate 322; fixed plate mounting hole 323; ;5. Fixed base; 6. Support plate; 7. Adjusting bolt; 8. Clockwise rotation direction; 9. Slight displacement in vertical direction;

Fig. 4 is another schematic structural view of the clamping device of the present invention;

Fig. 5 is a schematic structural view of the elastic front end cover in Fig. 4;

4 to 5: 3. Elastic front end cover; end cover plate 31'; stator mounting hole 311'; open accommodation cavity 312'; mounting ear 313'; elastic support thin wall 321'; fixing plate 322'; Mounting hole 323' of the fixed plate; 5, fixed base; adjusting bolt 7'.

Detailed ways

The accompanying drawings disclose, without limitation, the structural schematic diagrams of the preferred embodiments involved in the present invention; the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

Example 1

As shown in Figure 1 and Figure 2, the clamping device of the anti-friction driven ultrasonic motor of the present invention is used to clamp the stator, including a fixed base, an elastic front end cover and a support plate, and the elastic front end cover includes a The end cover plate and the elastic support assembly, the fixed base is fixedly connected to one end of the support plate, and the other end of the support plate is provided with a limit end ear, and the elastic front end cover is placed between the limit end ear and the fixed base, and the limit The terminal ear locks the elastic front cover and the fixed base through an adjustable fastening piece. In this embodiment, the adjustable fastening piece uses an adjusting bolt; the elastic support assembly includes a fixed plate and an elastic support thin wall; the elastic support There are at least 2 thin walls. In this embodiment, there are 2 elastic supporting thin walls. In fact, the number of thin walls is determined by the required deformation and the load force in the vertical direction, and the elastic supporting thin walls The wall is arrow-shaped or semi-circular arc-shaped, and the positions of the adjacent thin walls are in the opposite direction or in the opposite direction. Therefore, when the two ends of the elastic support thin wall are squeezed, it can expand and contract along the length direction and have certain elasticity; each elasticity One end of the supporting thin wall is connected to the fixed plate, and the other end is movable, and the movable end of each elastic supporting thin wall is in contact with the end cover plate; the center of the fixed plate is provided with a threaded hole, and the fixed plate is passed through by a threaded fastener. The threaded holes are fastened to the fixed base, and the elastic support thin walls are evenly distributed around the threaded holes on the fixed plate, so that the elastic adjustment of the end cover plate is relatively uniform.

When in use, the stator is integrated with the end cover plate through the stator mounting hole to complete the clamping and positioning of the stator. The specific structure is shown in Figure 3.

When the upper surface of the end cover plate is subjected to a force in the vertical direction, each elastic support thin wall is elastically deformed, and the position of the end cover plate in the vertical direction is slightly adjusted. The end cover plate drives other parts of the stator connected to it to move together, and the contact deformation between the driving end of the stator and the mover changes, thereby achieving the effect of changing the pre-pressure between the surfaces of the stator/mover. When the adjusting bolt is turned clockwise, the elastic front end cover will produce a slight displacement in the vertical direction, thereby increasing the pre-pressure between the stator driving end and the mover; otherwise, when the adjusting bolt is turned counterclockwise, the pre-pressure will increase decrease.

Example 2

Figure 3 and Figure 4 disclose another structural form of the clamping device of the present invention, the difference from Embodiment 1 mainly lies in the change of the structural form of the end cover plate in the elastic front end cover, so that the clamping device described in this embodiment The adjustment of the preload of the elastic support assembly can also be completed after the device reduces the component support plates used in Embodiment 1. Therefore, compared with Embodiment 1, this embodiment is more convenient to install and adjust, and the structure is relatively simple.

In this embodiment, the end cover plate includes an end cover plate body, and the end cover plate body is provided with an open accommodation chamber for accommodating the elastic support assembly, and the open end of the accommodation chamber is provided with mounting lugs. For example, in the accompanying drawings, two mounting lugs are formed by extending outward from part of the open end of the housing cavity, and mounting holes are provided on the surface of the mounting lugs, so that the mounting lugs are fixed with the mounting holes through the mounting holes by adjusting bolts. The base is locked; one end of the elastic support component touches the closed end of the open accommodating chamber, and the other end passes through the open end of the open accommodating chamber and is connected with the fixed base. Therefore, the adjustment of the pre-pressure between the stator and the mover can be completed by rotating the adjusting bolt clockwise or counterclockwise.

Claims (6)

1. A clamping device for an anti-friction driven ultrasonic motor, which is used to clamp a stator, is characterized in that it includes a fixed base and an elastic front end cover, and the elastic front end cover includes an end cover plate and an elastic support assembly for installing the stator , the elastic support assembly is placed between the end cover plate and the fixed base, and the end cover plate is locked with the fixed base through an adjustable fastening connector; the elastic support assembly includes a fixed plate and an elastic support thin wall; the elastic support There are at least two thin walls, one end of each elastically supported thin wall is connected to the fixed plate, and the other end is movable, and the movable end of each elastically supported thin wall is in contact with the end cover plate; the fixed plate is integrated with the fixed base. 2 . The clamping device for an anti-friction driven ultrasonic motor according to claim 1 , wherein the elastic supporting thin wall is arrow-shaped or semicircular-arc-shaped. 3 . 3. The clamping device of the anti-friction driven ultrasonic motor according to claim 1, characterized in that: the center of the fixed plate is provided with a threaded hole, and the fixed plate is fastened to the fixed base through the threaded hole by a threaded fastener, Each elastic supporting thin wall is evenly distributed around the threaded hole on the fixing plate. 4. The clamping device of the anti-friction driven ultrasonic motor according to claim 1, characterized in that: the fixed base is fixedly connected to one end of the support plate, and the other end of the support plate is provided with a limit end ear, and an elastic front end cover It is placed between the limit end ear and the fixed base, and the limit end ear locks the elastic front cover and the fixed base through an adjustable fastening connector. 5. The clamping device for anti-friction driven ultrasonic motor according to claim 1, characterized in that: the end cover plate comprises an end cover plate body, and the end cover plate body is provided for accommodating the opening of the elastic support assembly The open end of the accommodating cavity is provided with mounting lugs; one end of the elastic support assembly touches the closed end of the open accommodating cavity, and the other end passes through the open end of the open accommodating cavity and is connected to the fixed base ; The mounting ear is locked with the fixed base through an adjustable fastening connector. 6 . The clamping device for an antifriction-driven ultrasonic motor according to claim 1 , wherein the adjustable fastening member is an adjusting bolt or an adjusting screw. 7 .