Spatial Phase Modulation Annular Traveling Wave Ultrasonic Motor with Asymmetric Ceramic Partition and Its Control Method

Abstract

The invention provides a space phase modulation based ring-type traveling-wave ultrasonic motor with asymmetric ceramic subareas and a control method of the space phase modulation based ring-type traveling-wave ultrasonic motor with the asymmetric ceramic subareas. Piezoelectric ceramics comprise area-A1 piezoelectric ceramics, area-A2 piezoelectric ceramics, area-B3 piezoelectric ceramics and area-B4 piezoelectric ceramics, wherein the ceramics in every area occupy two wavelengths in space, the area-A1 piezoelectric ceramics and the area-B4 piezoelectric ceramics have the same space phases, the area-A2 piezoelectric ceramics and the area-B3 piezoelectric ceramics have the same space phases, the area-A1 piezoelectric ceramics and the area-A2 piezoelectric ceramics have a difference in one quarter wavelength in space, the area-B3 piezoelectric ceramics and the area-B4 piezoelectric ceramics have a difference in one quarter wavelength in space, and polarization directions of polarization subareas of the piezoelectric ceramics in all the areas are arranged according to '+-+-' sequentially. The space phase modulation based ring-type traveling-wave ultrasonic motor with the asymmetric ceramic subareas has all the advantages and functions of traditional space phase modulation based ring-type traveling-wave ultrasonic motors with subdivided ceramic structures, every polarization subarea of the piezoelectric ceramics is wider, all the polarization subareas of the piezoelectric ceramics in every area can keep continuous in space, and accordingly processing and manufacturing are facilitated and processing and manufacturing precision is improved.

Description

technical field [0001] The invention relates to a space-phase-modulated annular traveling-wave ultrasonic motor with asymmetrical ceramic partitions and a control method thereof. Background technique [0002] Space phase-modulated annular traveling wave ultrasonic motor is a kind of annular traveling wave ultrasonic motor which realizes spatial phase control through voltage regulation. The new control quantity of space phase provides more choices for the control of annular traveling wave motor. [0003] At present, the piezoelectric ceramics of the traditional space-modulated annular traveling wave ultrasonic motor adopts a subdivided ceramic structure, and each ceramic partition is half of that of the traditional annular traveling wave ultrasonic motor, and the number of partitions is doubled, which will cause the following problems: 1. The total area of ​​the insulation between the partitions increases, resulting in a decrease in the silver-covered area and a decrease in t...

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Problems solved by technology

[0003] At present, the piezoelectric ceramics of the traditional space-modulated annular traveling wave ultrasonic motor adopts a subdivided ceramic structure, and each ceramic partition is half of that of the traditional annular traveling wave ultrasonic motor, and the number of partitions is doubled, which will cause the following problems: 1. The total area of ​​the insulation between the partitions increases, resulting in a decrease in the silver-covered area and a decrease in the power of the motor; 2. The partitions of the phases are separated from each other, resulting in complicated and difficult wiring of the motor; 3. The reduction in the area of ​​the ceramic partitions leads to a decrease in the ceramic processing Difficult and does not contribute to the improvement of ceramic machining accuracy

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