Precise Positioning Ultrasonic Motor Excited by Dual Vibrator Combined Ultrasonic Vibrator

Abstract

The invention provides a double-vibrator combined type precise positioning ultrasonic motor excited by ultrasonic vibrators, belongs to the field of ultrasonic vibration application and aims at further improving the output performance of a thread pair drive ultrasonic motor and the linear positioning accuracy of the motor. The ultrasonic motor mainly comprises a thread output shaft, a linear actuator and two ultrasonic vibrators. Fixedly connected shock excitation elements are evenly are arranged in flat lateral sides or grooves of ultrasonic vibrator main bodies, and two combined locking end faces of the ultrasonic vibrators are locked in matching mode. The linear actuator is located in a cylindrical cavity formed by the locking end faces between the two ultrasonic vibrators. The thread output shaft is paired with central thread holes of the ultrasonic vibrators to perform output rotation and linear motion, and a central thread pair can be a replaceable thread pair drive element. The locking between the ultrasonic vibrators and the thread output shaft is achieved by controlling extension of the linear actuator. The double-vibrator combined type precise positioning ultrasonic motor excited by the ultrasonic vibrators can achieve flexible output, and can be used for the fields of aerospace, automobile industry, automation, medical apparatuses and instruments, optical driving, precise positioning systems and the like.

Description

technical field [0001] The invention belongs to the field of ultrasonic vibration application, in particular to a precision positioning ultrasonic motor excited by a combined ultrasonic vibrator. Background technique [0002] Based on the principle of ultrasonic driving, the ultrasonic motor is driven by the screw pair of the bending vibration mode of the cylindrical stator (also called the ultrasonic vibrator), mainly by exciting at least two bending vibration modes in the stator space, and using the coupling of vibration to generate the driving force on the inner surface of the stator. Traveling wave, realizing the rotation-linear motion output of the threaded rod output shaft. This type of threaded pair-driven ultrasonic motor has the characteristics of simple structure, high output force / mass ratio density, easy miniaturization, and high positioning accuracy. [0003] At present, there are several typical structures of ultrasonic motors driven by screw pairs: the stator...

AI Technical Summary

Problems solved by technology

In order to reduce the resonant operating frequency of the motor stator, a threaded linear motor driven by a piezoelectric composite bending beam whose stator is fixed at one end with a cantilever beam structure is proposed. For example, the patent number is CN200910080339.6. This type of motor mainly uses a columnar cantilever The coupling of the space-orthogonal bending vibration mode of the beam structure stator generates driving traveling waves to realize the motion output of the output shaft; another representative thread-driven cylindrical rotary-linear ultrasonic motor mainly has a stator with a piezoelectric sheet pasted on it. There are two types of ultrasonic lead screw motors, metal tube type and piezoelectric tube type, such as patent No. Two first-order bending vibrations that are orthogonal to each other in the space of the end-free restrained cylindrical stator generate driving traveling waves on the inner surface of the free end of the stator. Rotation-linear motion output of the output shaft; the piezoelectric elements used in the aforementioned thread-driven ultrasonic motor stators mostly use d 31 Vibration mode has certain advantages in the miniaturization of motors, especially for ultrasonic lead screw motors, this advantage is more obvious, but there is inevitably the practical problem of small output force

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