Spatially phase-modulated annular traveling wave ultrasonic motor with symmetrical ceramic partitions and its control method

Abstract

The invention provides a spatial phase modulation round traveling wave ultrasonic motor with symmetrical ceramic zones and a control method of the ultrasonic motor. The ultrasonic motor comprises piezoelectric ceramics. The piezoelectric ceramics comprise A1-zone piezoelectric ceramics, A2-zone piezoelectric ceramics, B3-zone piezoelectric ceramics and B4-zone piezoelectric ceramics. All ceramic zones are arrayed according to the A1-zone piezoelectric ceramics, the A2-zone piezoelectric ceramics, the B4-zone piezoelectric ceramics and the B3-zone piezoelectric ceramics along the circumference in space and are separated from one another by a quarter of wavelength, and each ceramic zone takes up two wavelengths in space. The width of each polarized zone of the piezoelectric ceramics is one-half wavelength. According to the counter-clockwise direction, the polarized directions of all polarized zones of the piezoelectric ceramics are sequentially arrayed according to a positive and negative alternating sequence. The motor and the control method thereof have all the functions and advantages of a traditional spatial phase modulation round traveling wave ultrasonic motor with a subdivided ceramic structure, moreover, each polarized zone of the piezoelectric ceramics is wider, all polarized zones of each zone of piezoelectric ceramics keep continuous in space, and processing and manufacture 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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