Electricity: motive power systems – Synchronous motor systems – Field winding circuits
Patent
1986-04-30
1987-04-21
Smith, Jr., David
Electricity: motive power systems
Synchronous motor systems
Field winding circuits
318712, H02P 540
Patent
active
046599738
ABSTRACT:
A brushless exciter is provided for controlling excitation of a synchronous motor. The brushless exciter uses a center tapped rotating transformer, a discharge resistor, a field winding which has one end coupled to the ends of the rotating transformer and the other end connected to the discharge resistor and center tap of the rotating transformer. Four power SCR's are used in the brushless exciter. The electronics for controllably firing the SCR's and applying and removing the field are arranged in modules. A field current regulator module is located externally of the rotating apparatus for external control and contains circuitry for field forcing. The circuitry controls the application of field current and the level of excitation. The circuitry monitors the presence, frequency and phase angle of the discharge current and determines the time for field application and removal.
REFERENCES:
patent: 3350613 (1967-10-01), Brockman et al.
patent: 3573577 (1971-04-01), Boyd
patent: 3811196 (1968-04-01), Larose
patent: 4027216 (1977-05-01), Rozek
patent: 4038589 (1977-07-01), Heyne et al.
patent: 4422028 (1983-12-01), Godwin et al.
Siemens Energy & Automation Inc.
Smith Jr. David
Ulbrich Volker R.
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