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Magnetostrictive Transducer

IP.com Disclosure Number: IPCOM000090253D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Holmwood, RH: AUTHOR [+3]

Abstract

By this transducer, improvements in metallic surface fusion are achieved by vibrating the electrode with special characteristics at a high frequency. In addition, improved control of energy flow in proper phase relation to the electrode motion is provided by the circuit. Electrode holder 5at A consists of rigid end mass 2 at one end of elastic member 3 of magnetostrictive material. Coil 4 surrounds member 3 to which holder 5 is fastened.

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Magnetostrictive Transducer

By this transducer, improvements in metallic surface fusion are achieved by vibrating the electrode with special characteristics at a high frequency. In addition, improved control of energy flow in proper phase relation to the electrode motion is provided by the circuit. Electrode holder 5at A consists of rigid end mass 2 at one end of elastic member 3 of magnetostrictive material. Coil 4 surrounds member 3 to which holder 5 is fastened.

Proper phase relationship between the transducer, whose mass is continually changing as the electrode is being consumed, and the driving circuit is obtained by locating pickup coil 6 adjacent to holder 5 as at B. Magnet 7, fastened to the electrode, moves at the same frequency as the electrode to generate a signal in coil 6. The output of coil 6 is applied to power amplifier 8 via low-pass filter 9 and preamplifier 10. The output from amplifier 8 is applied to coil 4 to drive holder 5.

At the higher operating speed obtained by this device the normal capacitor charging circuit is inadequate to provide the proper power without requiring prohibitive current levels. The conventional circuit includes power supply 11, adjustable storage capacitor C1, and a fixed and variable resistor R1 and R2. The resistor network is shunted by the circuit shown generally at 12. This provides a pulse of current sufficiently large to charge the capacitor and to permit the accurate positioning in time of that pulse with respect to the electrode to base metal contact time. Transistors T1...T6 function to achieving the pulse shaping and phase shifting. Transistors T7 and T8 are current amplifiers and their size and quantity is dependent on the siz...