Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-03-10
1996-03-26
Ip, Paul
Electricity: motive power systems
Induction motor systems
Primary circuit control
318800, 318811, 363 71, 363 97, H02P 700, H02P 540
Patent
active
055023606
ABSTRACT:
A non-invasive system for accurately determining the stator resistance in an electric motor during motor operation. The system includes a mechanism for determining the phase angle of the stator current within the dq frame of reference and a mechanism for transforming feedback voltages into a new frame of reference defined by this phase angle. Counter EMFs are detected which are free of stator resistance and used to force the counter EMF components of the stator winding voltages to conform to desired values. The stator resistance is then derived using simple mathematical relationships between the resistance, stator current, feedback voltage and known counter EMF values.
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Busse Doyle
Kerkman Russel J.
Seibel Brian J.
Allen-Bradley Company Inc.
Horn John J.
Ip Paul
Jaskolski Michael A.
Miller John M.
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