Forced commutated starting circuit for load commutated inverter

Electricity: motive power systems – Synchronous motor systems – Armature winding circuits

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318801, 318807, 363137, H02P 146, H02P 742

Patent

active

042887321

ABSTRACT:
In an inverter-synchronous machine drive system wherein a synchronous machine is excited by an inverter from a source of direct current, a pair of controlled bidirectional conduction means are serially coupled across the source of direct current potential, and are coupled at their junction through a commutating capacitor to the machine neutral terminal. Each controlled bidirectional conduction means, together with corresponding phase connected thyristor within the inverter, is correspondingly gated in a predetermined sequence so as to cause alternating voltage to be applied across each corresponding machine phase for initial machine excitation.

REFERENCES:
patent: 3487289 (1969-12-01), McMurray
patent: 3763417 (1973-10-01), Johnston
patent: 3838330 (1974-09-01), Rosa
patent: 3935528 (1976-01-01), Brenneisen et al.
patent: 4100469 (1978-07-01), Nelson et al.
patent: 4136382 (1979-01-01), Ricci
patent: 4180853 (1979-12-01), Scorso, Jr. et al.
by H. J. Gutt: "The Design of A.C.-Controller-Fed Induction Machines . . . " Siemens Rev. XXXVIII (1971) No. 1, pp. 40-43.

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