Method and apparatus for measuring the magnitude of a clamping l

Details Method and apparatus for measuring the magnitude of a clamping l Method and apparatus for measuring the magnitude of a clamping l

1974-10-22

1976-03-16

Gill, James J.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

G01N 924

Patent

active

039437558

ABSTRACT:
Method and apparatus for measuring the magnitude of a clamping load applied to a laminated iron core of an electric machine which comprises the steps of introducing a sound wave into a laminated iron core of an electric machine at one end face thereof and immediately generating a first electric signal; producing a second electric signal when the sound wave passes through the core body and reaches the opposite end face thereof; measuring a time interval between the emission of the first electric signal and that of the second electric signal; dividing a distance between both end faces of the laminated iron core by the measured time interval to calculate the velocity of a sound wave vertically propagating through the laminated iron core; and determining the measured magnitude of clamping load applied to said core from the calculated propagating velocity of a sound wave with reference to previously prepared data on a relationship between the magnitude of clamping load applied to the core and the corresponding propagating velocity of a sound wave.

REFERENCES:
patent: 2612772 (1952-10-01), McConnell
patent: 3066525 (1962-12-01), Harris
patent: 3101608 (1963-08-01), Benson et al.
patent: 3453872 (1969-07-01), Botsco
Hughes et al., The Evaluation of Bond Quality in Honeycomb Panels using Ultrasonic Surface Wave Techniques, Nondestructive -- Testing, Vol. 17, No. 6, Nov.-Dec., 1959, pp. 373-377.

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