Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1981-10-14
1983-11-08
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318729, 318812, 318806, H02P 540
Patent
active
044144997
ABSTRACT:
A standard, unmodified AC induction motor has its stator winding energized from a sine wave source through a signal-responsive wave modifier operative to control the portion of each cycle of the sine wave which is coupled from said source to the stator winding. An improved motor current demodulator, responsive to efficiency-related parameters and excessive stator winding inrush current each time said current increases from zero, produces signals for controlling the wave modifier, thereby to maintain optimum motor efficiency with varying motor loads and power source variations, and the signals also control a motor protector circuit which inhibits said wave modifier thereby to deenergize said stator winding under excessive input current conditions, excessive motor temperature or a potentially damaging combination thereof.
REFERENCES:
patent: 3965396 (1976-06-01), Tyler et al.
patent: 4021700 (1977-05-01), Ellis-Anwyl
patent: 4084406 (1978-04-01), Brenneman
patent: 4176307 (1979-11-01), Parker
patent: 4286303 (1981-08-01), Genheimer et al.
patent: 4298834 (1981-11-01), Opfer
patent: 4319298 (1982-03-01), Davis et al.
Dr. Louis W. Parker
Smith Jr. David
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