Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1981-12-23
1984-05-15
Smith, Jr., David
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318721, 318809, H02P 540
Patent
active
044490879
ABSTRACT:
A load commutated inverter synchronous motor drive system wherein a thyristor firing control of the inverter is determined by the amplitude of pesudo flux waveforms which are derived from the integral of the line voltages coupling the inverter to the motor being driven. A firing strategy is provided based on the premise that optimum thyristor firing in a load commutated inverter operating at a leading power factor occurs at a point just below the peak of the forthcoming pseudo flux waveform which point comprises an amount of volt-seconds necessary to effect current commutation plus a nominal safety margin. The determination and control is implemented, preferably, in a software phase lock loop but can, when desirable, be implemented in hardware.
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Espelage Paul M.
Lippitt David L.
Tupper Leland C.
Walker Loren H.
Weiss Herbert W.
Austin Ormand R.
General Electric Company
Renner Arnold E.
Smith Jr. David
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