Huang Wei-qing

A novel linear motor with piezoelectric stacks

A new type of linear motor based on non resonant vibration with piezoelectric stacks was investigated. The operation principle of the motor was studied basing on the output characteristic of the piezoelectric stack. The elliptical trajectory could be excited at driving top which was proved theoretically. The structure of the motor was designed and a prototype machine was fabricated. The testing of the prototype machine was carried on. It indicates that the motor can operate steadily in a wide range of frequency. Furthermore, the free velocity is approximately linear to the exciting voltage and the exciting frequency. When the frequency is 1.6kHz and the voltage is 100V, the free speed is 2.8×10−3m/s and the largest thrust is 3.5N.

Master-slave motion mapping method for dexterous hand driven by ultrasonic motors based on time-varying coefficients

Master-slave motion mapping method based on time-varying coefficients is proposed for the dexterous hand driven by ultrasonic motors. In order to evaluate the performance of motion mapping qualitatively, Feature Point Sets(FPSs) of dexterous and human hands are built to describe the whole configurations of both in Cartesian space, and then, a cost function based on generalized Euclidean norm of FPS is established for comparing the similarity between dexterous and human hands. As a result, the time-varying coefficients throughout the whole mapping process are obtained by SQP algorithm. Experimental results show that the proposed method fully meets the requirements of real-time and can achieve good mapping performance.