Circuit For Monitoring The Operation Of An Electric Motor
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United States of America Patent
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Issued Date -
May 8, 2014
app pub date -
Oct 31, 2013
filing date -
Nov 2, 2012
priority date (Note) -
Abandoned
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Abstract
A circuit for monitoring the operation of an electric motor comprises means for deriving a motor signal indicative of a relatively low frequency characteristic of the motor commutation current (for example the back EMF ripple) by rejecting the high frequency components which are mainly the result of the commutation events. The circuit also includes means for producing a pulse from the low frequency characteristic which has a duration related to the motor speed.
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