Vector Control of Piezoelectric Transducers and Ultrasonic Actuators

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Ghenna, Sofiane | Giraud, Frédéric | Giraud-Audine, Christophe | Amberg, Michel

Edité par HAL CCSD ; Institute of Electrical and Electronics Engineers

International audience. This paper presents the implementation of a novel vibration amplitude control and resonant frequency tracking for piezoelectric transducers (PTs) and ultrasonic motors (USMs). It is based on a generalization of the vector control method to the PT and the USM, which is explained in the first part. We show that two independent controllers with a similar structure are required: one tracks the resonant frequency and the second controls the amplitude. Wethen present the implementation into a low-cost digital signal processing controller with a sampling period of 200 µs. Experimental results on a Langevin transducer achieved a time response of 20 ms approximately, and the generality of the method is further demonstrated on a 2-D tactile stimulator at the end of this paper.

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