Signal control for motor position determination
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United States of America Patent
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Dec 16, 2008
Grant Date -
Jun 21, 2007
app pub date -
Dec 16, 2005
filing date -
Dec 16, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A controller estimates a motor position. The controller includes a driver and an injector. The driver generates a fundamental control signal. The injector generates a position carrier voltage that superimposed on the fundamental control signal. The injector alters the magnitude of the carrier voltage signal in response to the corresponding amplitude of the fundamental control signal. In a disclosed example, the injector increases the carrier voltage signal magnitude as the fundamental control current signal approaches a zero crossing. The injector then gradually decreases the carrier voltage signal magnitude as the fundamental control current signal magnitude increases from zero.
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