Dynamic braking load analyzer
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United States of America Patent
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Jun 8, 2010
Grant Date -
Oct 30, 2008
app pub date -
Apr 30, 2008
filing date -
Apr 30, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A dynamic braking load analyzer that determines the proper resistance value for a dynamic braking load resistor to be used in combination with a variable frequency drive or servo-drive to accommodate the power dissipated from an induction motor when it is being reduced in speed. The analyzer includes a resistor bank having a plurality of resistors electrically coupled in parallel. Switches are provided between the resistors, and a resistor selector switch determines which resistors are switched into the resistor bank circuit. A heat sensing resistor in the resistor bank measures the heat generated by the resistors and provides a signal that is read by a heat meter. The combination of the temperature measurement and the resistance of the resistors in the circuit gives the proper braking resistance value for the deceleration of the induction motor.
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