Angular velocity sensor
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United States of America Patent
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Oct 25, 2005
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N/A
app pub date -
Jun 8, 2004
filing date -
Dec 8, 2001
priority date (Note) -
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Abstract
An angular velocity sensor for a rotor (2) and method of determining angular velocity in which the position at which event generation means (4) pass sensing means (5) is determined using information from the times at which the event generation means (4) passed the sensing means (5) during at least one previous complete revolution to of the rotor (2). Especially applicable to use of Hall Effect Sensors to detect commutation points of a brushless permanent magnet rotor in an Electric Power Assisted Steering apparatus.
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