Motor control circuit and method of monitoring a motor
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United States of America Patent
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May 30, 2017
Grant Date -
Dec 31, 2015
app pub date -
Feb 10, 2014
filing date -
Feb 20, 2013
priority date (Note) -
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Abstract
A method of monitoring an electric motor circuit of the kind comprising an electric motor having a plurality of phases delta configuration, a plurality of electrical switches arranged in a bridge, operable in response to signals from a controller to selectively connect the phases to a power supply, the motor controller being responsive to a current error signal dependent on the difference between a demanded motor current value and an actual motor current value indicative of the actual current flowing in the motor where the method comprising the steps of processing at least one signal that is present in use of the electric motor circuit to identify a frequency component of the at least one signal that meets certain predefined criteria and in the event that the component is identified and that it does meet the criteria providing an indication that there is a fault.
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