Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-04-17
1987-08-25
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, 310332, 360 75, H01L 4108
Patent
active
046895140
ABSTRACT:
In a displacement generating device, a voltage signal generator produces a triangular-wave drive voltage signal so as to drive a piezoelectric element in a desired vibration mode. The voltage signal generator is connected to the piezoelectric element through a differentiator and a constant current supply. The drive voltage signal is differentiated by the differentiator, and is then supplied as a rectangular-wave voltage signal to the constant current supply. Since constant currents having two levels are alternately supplied to the piezoelectric element, an amount of charge accumulated in the piezoelectric element can be controlled linearly during the current supply time. As a result, since displacement of the piezoelectric element is linearly controlled in proportion to the amount of charge, it coincides with the triangular waveform of the drive voltage signal. A vibration mode free from hysteresis can be obtained.
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Electronics Letter May 27, 1982, vol. 18, No. II "Improving the Linearity of Piezoelectric Activators" C. V. Newcomb, J. Flinn.
Kondoh You
Tanuma Chiaki
Budd Mark O.
Kabushiki Kaisha Toshiba
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