Method and apparatus for controlling a brushless electro motor by determining the absolute phase position of the rotor relative to the stator
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United States of America Patent
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Feb 23, 1999
Issued Date -
N/A
app pub date -
Oct 27, 1997
filing date -
Oct 21, 1994
priority date (Note) -
Expired
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Abstract
The invention relates to a method for controlling an electric motor, in particular of a brushless electric motor, whereby the absolute phase position of a rotor in relation to a stator of the electric motor (4) is determined, and to an apparatus for the method. A characteristic feature of the invention is that one or several movement(s) of the rotor are excited, the absolute phase position of the rotor in relation to the stator is measured, and the absolute phase position is deduced therefrom.
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