The generator for a piezoelectric transducer, in particular for a piezoelectric motor for medical or dental applications, comprising two transformers (11A, 11B) each including a primary winding (L1) and a secondary winding (L2), and four switches (19A, 19B, 21A, 21B) driven by an ultrasonic frequency oscillator, two of said four switches (21A, 21B) being designed to connect alternately the secondary of each transformer to the piezoelectric load (5), and the two other switches (19A, 19B) being designed to connect alternately the two primary windings to a power supply (17) so that during a first half cycle, called “the positive half cycle” the primary winding of one of said two transformers is charged with power, while the secondary winding of the other transformer discharges power to the piezoelectric load, and so that during a second half cycle, called “the negative half cycle” the secondary winding of said one transformer discharges power to the piezoelectric load, while the primary winding of the other transformer is charged with power.