Removal of moisture from induction motors
AssigneeGeneral Electric Company
InventorAjith Kuttannair Kumar
Life of this patent
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Abstract
A method for removing moisture from an induction motor having at least two phase windings with each phase winding coupled by a first respective parallel combination of a first switch and a first diode to a positive voltage line and a second respective parallel combination of a second switch and a second diode to a negative voltage line includes supplying voltage to the positive and negative voltage lines and switching ON and OFF selected ones of the first and second switches to provide a current to preheat the induction motor. The provided current can be a substantially DC current or a substantially sinusoidal current.
Claims15
A method for removing moisture from an induction motor prior to motor operation, the motor having at least two phase windings with each phase winding coupled by a first respective parallel combination of a first switch and a first diode to a positive voltage line and a second respective parallel combination of a second switch and a second diode to a negative voltage line, the method comprising:
- supplying voltage to the positive and negative voltage lines;
- and
- switching ON and OFF selected ones of the first and second switches to provide a current to preheat the induction motor prior to energizing the motor for normal operation.
An apparatus for removing moisture from an induction motor having at least two phase windings with each phase winding coupled by a first respective parallel combination of a first switch and a first diode to a positive voltage line and a second respective parallel combination of a second switch and a second diode to a negative voltage line, the method comprising:
- a voltage source for supplying voltage to the positive and negative voltage lines;
- and
- a switch controller for switching ON and OFF selected ones of the first and second switches to provide a current to preheat the induction motor prior to energizing the motor for normal running operation.
Dependencies are inferred from the claim text.