Method to measure the angular speed of an induction motor
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United States of America Patent
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Aug 25, 2009
Grant Date -
May 17, 2007
app pub date -
Jan 20, 2006
filing date -
Nov 14, 2005
priority date (Note) -
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Abstract
The invention relates to a method for determining the electric angular speed of a rotor of an induction motor, wherein electric power supplied to phases of a stator of the induction motor affects the rotor, comprising the steps of: switching off the electric power supply to the phases of the stator during a particular period of time, picking-up signals corresponding to voltages at the stator phases within the particular period of time, and determining the electric angular speed of the rotor based on the picked-up signals.
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