Method and apparatus for determining angular velocity from two signals which are a function of the angle of rotation
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United States of America Patent
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Mar 21, 1989
Grant Date -
N/A
app pub date -
Nov 6, 1987
filing date -
Nov 10, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for determining angular velocity from two voltage signals which are produced by an angle transmitter (1) having a sinusoidal function with respect to the angle of rotation of a rotatable member and are shifted in phase by 90 angular degrees. The amount and sign of the angular velocity (.omega.) are determined by the division of the derivative of a first voltage signal with respect to time by the second voltage signal when said second voltage is above zero. In that signal range in which the second voltage signal passes below zero, the derivative of the second voltage signal with respect to time is divided by the first voltage signal. Alternatively, the amount of the angular velocity (.omega.) is determined from the vector sum of the derivatives of the two voltage signals with respect to time. The sign of the angular velocity is determined from the two voltage signals and their derivatives.
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