Title (en)

METHOD OF TUNING AN ULTRASONIC DEVICE, ULTRASONIC DEVICE AND MACHINE FOR PERFORMING AN ULTRASONIC TOOLING OPERATION

Publication

EP 0247752 A3 19880803 (EN)

Application

EP 87304161 A 19870511

Priority

GB 8611510 A 19860512

Abstract (en)

[origin: EP0247752A2] To ensure that an ultrasonic tool is driven at an optimum frequency, the phases of the voltage applied to the tranducer and the current flowing through the tranducer are compared, and an error signal is generated dependant upon the divergence of the phase difference from a desired difference, which may be zero phase difference. The error signal is functional to vary the frequency at which the ultrasonic device is driven, in the direction to reduce the error signal, so that the ultrasonic device can be driven at zero error signal (i.e. the desired current/voltage phase relationship) and thus at maximum efficiency.

IPC 1-7

B06B 1/02; G01H 13/00

IPC 8 full level

B06B 1/02 (2006.01)

CPC (source: EP)

B06B 1/0253 (2013.01); B06B 2201/72 (2013.01)

Citation (search report)

• [X] US 3472063 A 19691014 - BRANSON NORMAN G
• [X] US 2917691 A 19591215 - DE PRISCO CARMINE F, et al
• [X] US 3743868 A 19730703 - KAWADA T
• [X] US 3819961 A 19740625 - VERLET R, et al
• [X] US 3447051 A 19690527 - ATTWOOD JOHN G, et al
• [A] US 3808752 A 19740507 - BEAVER W, et al
• [X] ULTRASONICS, vol. 23, no. 4, July 1985, pages 151-156, Guildford, GB; A. RAMOS-FERNANDEZ et al.: "Automatic system for dynamic control of resonance in high power and high Q ultrasonic transducers"

Designated contracting state (EPC)

CH DE FR IT LI NL

DOCDB simple family (publication)

EP 0247752 A2 19871202; EP 0247752 A3 19880803; GB 2192512 A 19880113; GB 8611510 D0 19860618; GB 8711147 D0 19870617

DOCDB simple family (application)

EP 87304161 A 19870511; GB 8611510 A 19860512; GB 8711147 A 19870512