Apparatus for maintaining synchronism of an inverter-synchronous

Details Apparatus for maintaining synchronism of an inverter-synchronous Apparatus for maintaining synchronism of an inverter-synchronous

1979-09-28

1981-03-24

Rubinson, Gene Z.

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318722, 318802, 318810, H02P 534, H02P 536, H02P 742

Patent

active

042583020

ABSTRACT:
To achieve synchronization of an inverter-synchronous machine drive system, feedback of a phase angle signal, derived in part from stator current drawn by, and voltage supplied to, the synchronous machine, is provided to control the frequency of inverter thyristor conduction. At light or zero synchronous machine load conditions, machine stator current may be of insufficient magnitude to permit derivation of the phase angle feedback signal; therefore, substitute simulated stator current signals, proportional to a preselected combination of inverter thyristor gating pulses, are utilized to derive the phase angle feedback signal, thereby allowing inverter-synchronous machine drive synchronism to be maintained.

REFERENCES:
patent: 3784889 (1974-01-01), Michael
patent: 3896348 (1975-07-01), Loderer
patent: 4023083 (1977-05-01), Plunkett
patent: 4047083 (1977-09-01), Plunkett
patent: 4088934 (1978-05-01), D'Atre et al.
patent: 4172991 (1979-10-01), Akamatsu et al.
"Invertor Fed Induction Motor Drive Using Power Factor Control" by S. A. Rosenberg et al., pp. 810-813 of the Conference Record of the IEEE/IAS Annual Convention, Chicago, Ill., 1976.

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