Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1984-11-16
1987-02-10
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318806, H02P 540
Patent
active
046425462
ABSTRACT:
In order to maintain the flux in an asynchronous machine supplied by an intermediate-link converter in the event of a network disturbance, the converter is initially blocked at the beginning of the network disturbance. After the intermediate-link current has decayed, the timing of the free-running converter on the machine side and the ignition of two series-connected controlled rectifiers of the converter on the network side are effected. The flux still present in the machine induces in the stator circuit closed in this manner a machine current which is controlled by a supplemental current controller in an operation slightly on the generator side, whereby, at the expense of the kinetic energy of the synchronized machine, a current through the circuit is generated which is required for covering the dielectric losses and for maintaining the desired flux.
REFERENCES:
patent: 3887860 (1975-06-01), Bernhardt et al.
patent: 4267570 (1981-05-01), Braun
patent: 4409533 (1983-10-01), Kawabata
patent: 4451112 (1984-05-01), Hattori et al.
patent: 4471419 (1984-09-01), Schneider et al.
patent: 4475150 (1984-10-01), D'Atre et al.
Siemens Aktiengesellschaft
Smith Jr. David
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