Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1987-08-14
1988-12-20
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318767, 363148, H02P 748
Patent
active
047927402
ABSTRACT:
A three-phase induction motor is efficiently driven by a single phase power supply by, in one embodiment, splitting the three windings into six, connecting them in two symmetrical motors, with two of the winding pairs connected to each other. The resulting 4-terminal motor is placed across the single phase supply with appropriate capacitors providing balanced currents. For better efficiency, feedback control, along with transformers, may be used.
A similar feedback, transformer technique, may be used on a standard three terminal three-phase motor. Lastly, for such a motor, the foregoing techniques may be applied to a three wire residential power supply.
REFERENCES:
patent: 1912207 (1929-01-01), Kennedy
patent: 3673480 (1972-06-01), Johnstone
patent: 4060754 (1977-11-01), Kirtley et al.
patent: 4465962 (1984-08-01), Kirschbaum
patent: 4484125 (1984-11-01), Hertz
patent: 4513237 (1985-04-01), Ford
patent: 4618809 (1986-10-01), Maeda
patent: 4745348 (1988-05-01), Young
"Current Techniques in Phase Conversion Systems", by Claude M. Hertz, Vice President-Engineering Ronk Electrical Industries, Inc., Presented at the IEEE 1978 Rural Electric Power Conference, Minneapolis, Minn., May 1-2, 1978.
Shoop Jr. William M.
Young Brian K.
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