Space phase modulation toroidal traveling wave ultrasonic motor with symmetrical ceramic partitions and control method thereof

Abstract

The invention provides a space phase modulation toroidal traveling wave ultrasonic motor with symmetrical ceramic partitions and a control method thereof. Piezoelectric ceramic comprises A1-area piezoelectric ceramic, A2-area piezoelectric ceramic, B3-area piezoelectric ceramic and B4-area piezoelectric ceramic. The ceramic partitions are successively arranged along the circumference in the space according to A1-area, A2-area, B4-area and B3-area piezoelectric ceramic. The ceramic partitions are spaced by quarter wavelength from each other. The ceramic in each area occupies two wavelengths in the space. The width of each polarization partition of the piezoelectric ceramic is half wavelength. In the counterclockwise direction, the polarization directions of the polarization partitions of the piezoelectric ceramic of any three areas are arranged in the order of +, -, + and -. The polarization directions of the polarization partitions of the piezoelectric ceramic of another area are arranged in the order of -, +, - and +. According to the invention, the motor has all functions and advantages of a space phase modulation toroidal traveling wave ultrasonic motor with a traditional subdivision ceramic structure; each polarization partition of the piezoelectric ceramic is wider; all polarization partitions of the piezoelectric ceramic in each area are spatially continuous; and the processing and production are more convenient and accurate.

Description

technical field [0001] The invention relates to a space-phase-modulated annular traveling-wave ultrasonic motor with symmetrical 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 th...

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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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