Method and Apparatus for Estimating Rotor Position in a Sensorless Synchronous Motor
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United States of America Patent
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Issued Date -
Sep 23, 2010
app pub date -
Mar 23, 2009
filing date -
Mar 23, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a simple, robust, and universal position observer for use with sensorless synchronous machines. The observer may be implemented using an equivalent EMF model of a synchronous machine or, alternately, using a sliding mode controller based on the equivalent EMF model of the synchronous machine. The observer may be used on any type of synchronous machine, including salient or non-salient pole machines such as a permanent magnet, interior permanent magnet, wound rotor, or reluctance synchronous machine. The observer provides low sensitivity to parameter variations and disturbances or transient conditions in the machine. In addition, no knowledge of speed is required as an input to the observer and an estimated position may be calculated using a subset of the machine parameters.
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