Apparatus to measure the eccentricity of a shaft

Details Apparatus to measure the eccentricity of a shaft Apparatus to measure the eccentricity of a shaft

1976-05-06

1977-11-08

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

Displacement

324 61R, 324103P, G01R 3312

Patent

active

040577546

ABSTRACT:
A transducer is utilized to convert the eccentricity of a turbine shaft into a sinusoidal electrical voltage signal having a given frequency, amplitude and a DC bias. This electrical signal is provided to a circuit which periodically measures the maximum and minimum peaks of the sinusoidal signal. The frequency at which the latter measurements occur is related to the frequency of the sinusoidal input signal. The maximum and minimum levels of magnitude are stored periodically as DC levels and subtracted from each other to determine the absolute value of eccentricity. In addition the stored minimum value is compared with the sinusoidal signal to reduce the DC bias of the sinusoidal signal to a point where the negative peaks thereof are at zero.

REFERENCES:
patent: 3593133 (1971-07-01), Wisner
patent: 3665506 (1972-05-01), Sanford
patent: 3715659 (1973-02-01), Abnett et al.
patent: 3768010 (1973-10-01), Pozzetti

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