Travelling wave ultrasound motor with dual stator and rotor multi-diameter shaft structure

Abstract

A travelling wave ultrasound motor with a dual stator and rotor multi-diameter shaft structure belongs to the technical field of ultrasound motor. Two groups of stators and rotors are arranged between the external fixing structure and the internal supporting structure of the motor, wherein the external fixing structure is composed of two stator seats arranged opposite to each other, and a drum-shaped shell arranged between the stator seats, the internal supporting structure is formed by limiting the shaft position of the multi-diameter shaft by thrust bearings in the stator seats. The invention not only maintains the advantages of the existing ultrasound motor with single stator and rotor, but also is easier to operate, has more contact structure, higher torque to capacity ratio and stronger anti-interference capacity to external load, thus being especially suitable for fields of aerospace and biomedicine.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic motors, in particular to a disc-shaped rotating traveling wave ultrasonic motor with a combined structure. Background technique [0002] The disc-shaped traveling wave ultrasonic motor is a new type of special motor. It uses the inverse piezoelectric effect of the piezoelectric ceramic sheet to convert the electrical energy into the mechanical energy of the stator metal vibrating body, and generates a micro-amplitude vibration of the ultrasonic frequency on the surface of the stator. The vibration mode is superimposed on the Traveling waves are formed on the surface of the stator, and the micron-scale vibration of the stator vibrating body is converted into the rotation of the rotor by using the axial preload and the friction of the contact surface, so as to output mechanical energy to drive the load to work. Disc-shaped traveling wave ultrasonic motors can be used in aerospace and biomedical f...

AI Technical Summary

Problems solved by technology

[0005] (3) The mass of the rotor is small, and the response time of start and stop is milliseconds

Image 6 The fourth type of motor is the schematic diagram of the motor structure in the document "Development of Large Torque Traveling Wave Ultrasonic Motor" (Proceedings of the Chinese Society for Electrical Engineering, August 2002, P67-P70). Two stators are installed on both sides of the middle chassis. The left rotor, the left stator vibrating body, and the left piezoelectric ceramic sheet form a group of driving sources, and the right piezoelectric ceramic sheet, right stator vibrating body, and right rotor form another group of driving sources. The connected shaft outputs torque, the left compression spring adjusts the pre-pressure between the left set of stator and rotor, and the right compression spring adjusts the pre-pressure between the right set of stator and rotor. It is difficult to do exactly the same, and the pressure on the two rotors cannot be exactly the same. In addition, there are unfavorable factors such as the change of driving frequency, so it is actually impossible for the two vibrators to output their maximum torque at the same time. The experimental result is " Due to the unstable operation of the double vibrator motor, its experimental curve cannot be measured

" Figure 7 The fifth type of motor is the schematic diagram of the motor structure in the document "Research on Some Key Issues of Traveling Wave Ultrasonic Motors" (Ph.D. Thesis of Zhejiang University, 2006, P107-P108). The right rotor and right stator constitute a group of driving sources, and the left stator and left rotor constitute another group of driving sources. The two groups of driving sources output torque through the shaft connected to the two rotors. The pre-pressure between the stator and rotor is directly controlled by the rotor. The deficiencies of this motor are as stated in its literature, “Due to machining errors, motor materials and manufacturing processes, it is difficult to ensure that the performance of the two motors is completely consistent, especially the resonant frequency of the motors is difficult to achieve the same. Therefore, the actual production The output torque of the motor is not a linear superposition of the torque of the two motors

At the same time, the structure of this motor is relatively complicated, which increases the difficulty of processing and debugging

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