Determination of average speed of rotation of a cyclically loade

Details Determination of average speed of rotation of a cyclically loade Determination of average speed of rotation of a cyclically loade

1978-02-06

1979-12-18

Corcoran, Robert J.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

364565, G01P 1100

Patent

active

041796560

ABSTRACT:
A method of determining average speed of a cyclically loaded rotating shaft, and an electronic tachometer for practicing the method. The revolutions of the shaft are counted electronically, a highly time-regular pulse stream is provided, and simultaneously with the counting of the shaft revolutions, the number of pulses in the pulse stream is counted over a time span of between 2 and 120 seconds. Then, the number of revolutions counted is electronically divided by the number of time pulses counted during the time span of 2 to 120 seconds to determine average speed, the speed so determined is digitally displayed, and the revolution and time pulse counting cycles are restarted. The accuracy of the average speed displayed is .+-.0.05%.+-.1 count when the time span is 2 seconds, with a resolution of 0.1 rpm.

REFERENCES:
patent: 3757167 (1973-09-01), Yoshikawa et al.
Bederman, S.; Computer and Apparatus for Measuring Rotational Speed; IBM Tech. Bull; vol. 13; No. 4; Sep. 1970; pp. 1017-1018.

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