Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Reexamination Certificate
2008-04-30
2010-06-08
Leykin, Rita (Department: 2837)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
C361S025000, C361S001000, C361S103000, C318S471000, C318S473000, C318S371000, C318S759000, C374S100000, C374S114000, C323S352000, C323S353000, C323S354000
Reexamination Certificate
active
07733615
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.
REFERENCES:
patent: 4093900 (1978-06-01), Plunkett
patent: 6262555 (2001-07-01), Hammond et al.
patent: 6373207 (2002-04-01), Yablonovitch
patent: 6417577 (2002-07-01), Grewe et al.
patent: 6417644 (2002-07-01), Hammond et al.
patent: 6577483 (2003-06-01), Steicher et al.
patent: 7312593 (2007-12-01), Streicher et al.
patent: 7315144 (2008-01-01), Imaie et al.
Crowe Michael
Eschleman Joseph S.
Yingling Thomas
Leykin Rita
Miller John A.
Miller IP Group, PLC
Powerohm Resistors, Inc.
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