Piezoelectric motor having an arrangement which provides informa

Details Piezoelectric motor having an arrangement which provides informa Piezoelectric motor having an arrangement which provides informa

1995-12-18

1998-02-17

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, H01L 4108

Patent

active

057194610

ABSTRACT:
Along the inner lying rotor trailing surface (21) of an annular rotor (20) are successively provided regions (26a-c) of small wall thicknesses (29) and regions (25a-c) of larger wall thicknesses, which differ with respect to the acoustic impedance spectrum. During the state of operation, i.e. when the rotor (20) turns, the mentioned regions (24a-c; 25a-c) are excited alternately by the piezoelectric excitor (15) of the stator (13). The acoustic impedance spectrum which changes periodically, influences the electrical impedance spectrum of the motor (10) in an analog manner. These changes are measured via the voltage supply connections of the motor (10) and are interpreted as relative positional changes between the stator (13) and the rotor (20).

REFERENCES:
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patent: 4453103 (1984-06-01), Vishnevsky et al.
patent: 4634916 (1987-01-01), Okada et al.
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patent: 5332941 (1994-07-01), Honda
patent: 5521455 (1996-05-01), Miyazawa et al.
Patent Abstracts of Japan vol. 18, No. 595 (E-1630), 14 Nov. 1994 & JP-A-06 225550 (Seiko Instr Inc) 12 Aug. 1994.
Patent Abstracts of Japan vol. 15, No. 258 (E-1084), 18 Jun. 1991 & JP-A-03 082380 (Shinji Kawase) 8 Apr. 1991.

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