Apparatus for full voltage start of vibratory excitors

Details Apparatus for full voltage start of vibratory excitors Apparatus for full voltage start of vibratory excitors

1979-08-03

1982-03-16

Smith, Jr., David

Electricity: motive power systems

Motor load, armature current or force control during...

Initial, 'cracking' or 'starting from rest' torque control

318780, H02P 126

Patent

active

043203280

ABSTRACT:
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 autotransformer apply a preset reduced voltage to operate the motor.

REFERENCES:
patent: 1921770 (1933-08-01), Nelson et al.
patent: 2583299 (1952-01-01), Lloyd et al.

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