Method for determining the position of the rotor of a synchronous alternating-current permanent-magnet machine
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United States of America Patent
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-
Nov 30, 2004
Grant Date -
Jul 3, 2003
app pub date -
Dec 27, 2002
filing date -
Dec 28, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for determining a position of a rotor of a synchronous alternating-current permanent-magnet machine includes injecting a high-frequency voltage superimposed on a voltage delivered by a machine control system; measuring a current of the motor and extracting a current corresponding to the injected voltage; and obtaining, from the injected voltage and from the corresponding current, an electrical angle .theta. suitable to identify the position of the rotor by using a sine and cosine of twice the electrical angle .theta. of the machine.
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