Full voltage start of vibratory excitors

Details Full voltage start of vibratory excitors Full voltage start of vibratory excitors

H - Electricity

02

P

318/73

H02P 1/16 (2006.01) H02P 1/26 (2006.01)

Patent

CA 1140208

ABSTRACT OF THE DISCLOSURE An improved apparatus for an automatic full voltage start of a polyphase synchronous or induction motor. A full line voltage is employed to start the motor by energizing two tap relays to shunt the tap connections of the coils of an autotransformer and to thereby apply a line voltage to the primary windings of the motor. A strap relay is de-energized to disconnect the coils of the autotransformer when the motor is at rest and when the motor is being started. After the motor is started, the tap relays are de-energized to break the shunt connections and the strap relay is energized to connect the coils of the autotransformer. The taps of the auto- transformer apply a preset reduced voltage to operate the motor.

347219

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