Surface acoustic wave machine

Details Surface acoustic wave machine Surface acoustic wave machine

1995-09-14

1999-02-16

LaBalle, Clayton

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310322, 310316, H01L 4108

Patent

active

058724168

ABSTRACT:
A rotating machine comprises a stator that is excited to vibrate to generate progressive surface waves at a frequency within a resonance frequency range of a predetermined rank. The rotor is designed so that the vibrations in the stator generate vibrations of the same frequency and of lower magnitude. A vibration sensor is mounted on the rotor to provide a signal. The difference in frequency between the excitation frequency of the stator and the vibration frequency detected on the rotor corresponds to the rotation speed of the rotor.

REFERENCES:
patent: 4794294 (1988-12-01), Shimizu et al.
patent: 5173631 (1992-12-01), Suganuma
patent: 5461273 (1995-10-01), Kawasaki et al.
patent: 5493164 (1996-02-01), Nogarede

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