Induction motor temperature measurement using phase controlled alternating current
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
Jan 13, 2015
filing date -
Jan 13, 2015
priority date (Note) -
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Abstract
Methods and systems are provided for monitoring current flow in an induction motor, particularly an induction motor associated with a washing machine and for controlling operation of the motor to limit thermals during operation of the motor. The subject matter provides for periodically stopping the motor and applying a phase limited alternating (AC) voltage to the motor that is of insufficient magnitude to start the motor rotating. A current reading is taken and converted using a look up table to a corresponding temperature. If the temperature exceeds a predetermined amount, temperature fold back procedures are initiated the may include shortening and/or pausing certain washer operations.
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