Induction motor with integrated sensor
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United States of America Patent
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-
May 15, 2007
Grant Date -
Jan 12, 2006
app pub date -
Jun 28, 2005
filing date -
Jul 9, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An induction motor comprises a stator (10) and a rotor (20), which includes material essentially blocking magnetic flux at high frequencies. A difference in number of stator slots and rotor slots is chosen so that the inductance of a winding provided in a stator slot is different from the inductance of a winding provided in another stator slot. A sense means, such as stator winding or separate sense winding, is provided in at least one of the stator slots and the sense means is arranged to allow measuring of the inductance thereof. The sense means constitutes an integrated sensor, which is both inexpensive and reliable. A method of sensing the rotor position and/or speed of an induction motor is also described.
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