TRACKING CIRCUIT AND METHOD FOR TRACKING AN ORIENTATION OF A ROTOR OF A MOTOR DURING A LOSS OF SOURCE POWER TO A MOTOR DRIVE
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United States of America Patent
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Issued Date -
Aug 27, 2015
app pub date -
Oct 10, 2013
filing date -
Oct 25, 2012
priority date (Note) -
Abandoned
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Abstract
A tracking circuit for tracking an orientation of a motor rotor during a loss of source power to a motor drive includes an electrical energy store for generating a drive signal during periods of source power loss, and a phase locked loop, which is arranged to receive as inputs the drive signal and an induced signal generated during rotor rotation during the periods of source power loss, so that drive signal variations become locked to induced signal variations. The method stores electrical energy in the store during periods of source power supply to the motor drive and generates a drive signal from the electrical energy store during periods of source power loss to the motor drive. The method may vary the drive signal in dependence of an induced signal generated by rotor rotation during a source power loss to the motor drive, to track rotor orientation.
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