Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Reexamination Certificate
2007-05-29
2007-05-29
Leykin, Rita (Department: 2837)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
C361S006000, C361S023000, C361S030000, C361S031000, C361S033000, C361S054000, C361S056000
Reexamination Certificate
active
10859507
ABSTRACT:
Control of an induction motor is carried out to limit damaging arcing stress and mechanical stresses placed on the control contactor assembly and the induction motor resulting from the simultaneous or synchronous breaking and making of contactors employed to connect the windings of the motor to a power supply. Asynchronously connecting the windings to the power supply via the asynchronous or non-simultaneous closing of the contactors of a modular contactor assembly reduces the potentially damaging transient current, the associated torque oscillations, and mechanical stresses. The present invention is particularly applicable to delta motors that are started with its windings in a star or wye configuration followed by the reconnection of the windings in a delta configuration when the motor is at normal running speed.
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Kinsella James J.
Little Michael T.
Unsworth Peter J.
Wieloch Christopher J.
Zhou Xin
Eaton Corporation
Leykin Rita
Ziolkowski Patent Solutions Group, SC
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