Apparatus and methods for reduced voltage starting of motors with bumpless force transition

A reduced voltage starter for electric motors comprises a controller, and a plurality of semiconductor switches to selectively connect a power source to a motor. The controller is configured to apply a first voltage ramp to provide a controllable fraction of the full line voltage to the motor, while...

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Bibliographische Detailangaben
Hauptverfasser: Farr, Thomas A, Simms, Stan R, Braga, Gabriel Teixeira
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:A reduced voltage starter for electric motors comprises a controller, and a plurality of semiconductor switches to selectively connect a power source to a motor. The controller is configured to apply a first voltage ramp to provide a controllable fraction of the full line voltage to the motor, while maintaining a current flow to be within a programmable current limit during motor startup. The controller is further configured to implement a bumpless force transition, by applying a second voltage ramp when the speed of the motor is below the rated motor speed, and force transition criteria correlated with overheating of the semiconductor switches and/or a connected load are met.