Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1988-02-09
1990-12-25
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
H02P 540
Patent
active
049806300
ABSTRACT:
The present invention relates to method and apparatus for asyncyhronous motor's speed regulation using strobe control, which may be carried out graded or nongraded speed regulation in conventional monospeed squirrel cage motor with simplicity, reliability, cheapness and high efficiency. It provides a notable electricity-saving result with good economical efficiency, especially in asynchronous motors speed regulation of ventillator and water pump driving. The said speed regulation method is using switch 5,6 sequentially to transmit a positive half-wave voltage and a negative half-wave voltage between the input terminals of strating and working windings of asynchronous motor 1, and then, will be repeated above said cycle continuously.
REFERENCES:
patent: 3302090 (1967-01-01), Rayfield
patent: 3668489 (1972-06-01), Erdmann
patent: 4060754 (1977-11-01), Kirtley, Jr. et al.
patent: 4401933 (1983-08-01), Davy et al.
patent: 4459532 (1984-07-01), Schutten et al.
patent: 4524316 (1985-06-01), Brown et al.
Semmes David H.
Smith Jr. David
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