Electric motor having rotor-embedded sensor
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United States of America Patent
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Jan 7, 2003
Issued Date -
N/A
app pub date -
Feb 20, 2001
filing date -
Nov 30, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electromechanical device comprises a stator and a rotor which is capable of rotating relative to the stator. The rotor has a sensor embedded therein. In a preferred embodiment, the sensor is disposed within a plurality of laminations that are stacked one on top of another. For example, one of the plurality of laminations may be a sensor lamination, in which case the sensor is at least partially disposed within a cavity formed in the sensor lamination. Advantageously, the sensor may be used to directly measure rotor-associated operating conditions, such as rotor current (including the magnitude, frequency and phase of the rotor current), rotor fatigue, rotor temperature, rotor airgap, rotor flux and rotor torque. The sensor is especially well-suited for measuring current in the rotor of an induction motor.
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