Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-02-01
1983-11-08
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318812, H02P 540
Patent
active
044145004
ABSTRACT:
Apparatus for controlling the speed of a motor which includes a switch connected in series with the motor for controllably conducting an A.C. signal to the motor and means for controlling the switch which includes first means for generating a series of pulses at a frequency which may be varied according to an input signal, second means for generating a pulse once per cycle at a zero crossing of the A.C. signal, third means for generating a pulse at said A.C. signal zero crossing if a pulse was produced by the first generating means during the A.C. cycle immediately preceding said zero crossing, and fourth means responsive to the output of the third generating means for generating a pulse which is supplied to and renders conductive said switch for one complete A.C. cycle.
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Allied Corporation
Smith Jr. David
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