Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1985-05-01
1987-03-31
Smith, Jr., David
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318723, 318798, 318806, H02P 540
Patent
active
046545727
ABSTRACT:
A load-commutated inverter for operating a synchronous motor having two sets of 3-phase windings. The difference of phase angles between the two sets of the 3-phase windings is 30 degrees. The load-commutated inverter is provided with two sets of inverters and a control circuit. Each of the inverters, is formed of thyristors. The inverters are coupled respectively to the 3-phase windings of the motor. The commutation of each of the thyristors is controlled in accordance with a given advanced control angle. The control circuit is coupled to the inverters and is responsive to a commutation overlapping angle of currents (e.g., IU1, IV1 in FIG. 4A) supplied from the inverters to the 3-phase windings of the motor. The control circuit adjusts the given advanced control angle so as to retain a relation:
REFERENCES:
patent: 4264853 (1981-04-01), Morishita
patent: 4276504 (1981-06-01), Nagase et al.
patent: 4309643 (1982-01-01), Akamatsu
patent: 4364004 (1984-12-01), Bourbeau
patent: 4392099 (1983-07-01), Kuniyoshi
patent: 4426611 (1984-01-01), Espelage et al.
patent: 4460861 (1984-07-01), Rosa
Kabushiki Kaisha Toshiba
Smith Jr. David
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