Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-05-04
1995-11-28
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318727, 318729, 318812, 318806, 318798, H02P 528
Patent
active
054711274
ABSTRACT:
An induction motor is operated at a high electrical efficiency level by employing a line current peak detector in conjunction with an electronic phase angle controller and a microprocessor system controller. If the line current peaks remain substantially constant the phase angle controller increases a phase gap in the applied line voltage to a width incrementally greater than a full-load value, at which point the line current peak value increases substantially. The increase in line current peak value is sensed by the line current peak detector and a signal is transmitted to the microprocessor system controller which in turn automatically adjusts the control input to the phase angle controller in order to incrementally decrease the existing phase gap in the output of the phase angle controller. Varying mechanical loads are therefore automatically accommodated while keeping the motor running efficiently.
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Vaughan Mark C. V.
Vaughan Simon P.
Dautremont James H.
Energy Reduction International Ltd.
Masih Karen
Shoop Jr. William M.
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