Method and apparatus for rotor angle detection
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United States of America Patent
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Jan 9, 2001
Grant Date -
N/A
app pub date -
Sep 29, 1998
filing date -
Sep 29, 1998
priority date (Note) -
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Abstract
A method and apparatus for determining the absolute position of a rotor in a permanent magnet synchronous machine (e.g. motor or generator) at standstill wherein short positive and negative voltage pulses are separately provided to each stator winding and the rate of current change with respect to time for each current is determined, the rates are used to determine general rotor position angle and thereafter are used to determine correction angle for correcting the general angle.
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