Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-06-30
1983-05-03
Truhe, J. V.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318345B, 307567, H02P 736
Patent
active
043822185
ABSTRACT:
A pair of anti-parallel connected NPN transistors function in push-pull manner to regulate alternately current power applied via the transistors to an induction motor driving a fan providing a generally constant motor load. As the transistors apply more or less current to the motor by varying the amount of line voltage applied thereto, the motor speed varies due to more or less pole slippage. The transistors, while reducing the voltage applied to the motor, generally maintain the sine wave characteristics of the applied voltage to preclude high current spikes and other undesirable transients that could result in conventional motor speed circuits utilizing thyristors that are phase-triggered to vary the half-cycle portions of the applied motor voltage.
REFERENCES:
patent: 2981879 (1961-04-01), Taylor et al.
patent: 3125694 (1964-03-01), Palth
Keane Patrick C.
Stratford Manufacturing, Inc.
Truhe J. V.
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