Precompression adjusting method and device arranged in ultrasonic motor

• Main Authors: WANG JUNSHAN, QIANG LUSHENG, CHEN CHAO, JIAN LEI
• Format: Patent
• Language: Chinese; English
• Published: 06.04.2018
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION

A precompression adjusting method and device arranged in an ultrasonic motor are provided; the features are that the precompression adjusting device is embedded in an ultrasonic motor original system;the precompression adjusting device comprises a cuboid piezoelectric stack arranged on three input ends evenly distributed on the periphery of a flexible amplification mechanism; the piezoelectric stack is powered to elongate and output a force and displacement; the force and displacement are amplified by the flexible amplification mechanism and applied on a disk spring, and thus providing a stable precompression for the stator-rotor contact interface of the ultrasonic motor through a pressure sleeve and a thrust bearing; a preload nut screwed with the housing can compact on a wedge plate exposed outside the housing, thus adjusting the pretightening force of the piezoelectric stack; when the ultrasonic motor starts up, voltages of different frequencies in certain scope are applied to thestator, thus carrying out