Electricity: motive power systems – Induction motor systems – Power-factor control
Patent
1979-07-26
1981-02-03
Rubinson, Gene Z.
Electricity: motive power systems
Induction motor systems
Power-factor control
318805, 318808, H02P 736
Patent
active
042491207
ABSTRACT:
A variable speed induction motor control system includes a variable voltage DC bridge coupled to a frequency controlled power inverter which in turn drives an induction motor. A motor power factor detecting circuit determines the relative voltage/current phase angle for the motor and derives a corresponding power factor error signal. The DC bridge and inverter respond to the power factor error signal to maintain the input power conditions of the motor at a near optimum efficiency. The power factor detecting circuit uses an exclusive OR gate to provide a pulse having a duration corresponding to the motor power factor which enables a counter during the pulse interval. After each pulse, the count which is indicative of the motor power factor, is applied to a holding circuit and converted to an analog error voltage.
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patent: 3441823 (1969-04-01), Schlabach
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patent: 3701013 (1972-10-01), Gilmore
patent: 3718847 (1973-02-01), Graf et al.
patent: 3718852 (1973-02-01), Bailey
patent: 3748556 (1973-07-01), Gillett
patent: 3909687 (1975-09-01), Abbondanti
patent: 4052648 (1977-10-01), Nola
patent: 4176307 (1979-11-01), Parker
Efficiency Spurs Adjustable Frequency Drive Use, Fisher & Cota, Water and Waste Engineering, pp. 41-44, 64 (Oct. 1975).
Ekstrand Roy A.
Gealow Jon Carl
LaPorte Ronald J.
McGraw-Edison Co.
Rubinson Gene Z.
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