| 摘要 |
A piezoelectric drive, especially a piezoelectric motor for producing continuous or stepwise movements, a friction element for such a piezoelectric drive as well as for transmission of forces between stator and rotor, and a circuit arrangement for operating a piezoelectric drive, especially a piezoelectric motor. An elastic double frame enclosing the transducer and having inner and outer frames is disposed at each outer node of the bending oscillation mode to hold the piezoelectric transducer and produce the pressing force of the friction element. The inner frame is joined to each of the longitudinal narrow sides of the transducer and the outer frame to the outer fastening. Further, the outer frame and inner frame are spaced apart and maintained in contact by stays or bridges. The friction element is constructed as a double-layer structure with a first hard, porous member joined to the transducer, and with a second part or member including an abrasion-resistant monolithic material maintained in contact with the rotor, the two layers being bonded by sintering. The circuit arrangement for operation of the drive relies on a special bridge power amplifier as well as on the capability of compensating for temperature variation of the drive for stable operation thereof.
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