Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1980-02-25
1981-12-22
Dobeck, B.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318812, 318440, H02P 746
Patent
active
043073280
ABSTRACT:
First to fourth windings are fitted in the slots of each phase of a three-phase AC motor. Those windings are connected in series to silicon controlled rectifiers (SCRs), respectively. The first and second windings having the SCRs form a first antiparallel circuit and the third and fourth windings having the SCRs form a second antiparallel circuit. Three first antiparallel circuits are connected in a delta connection. Three second antiparallel circuits are connected in a star connection with a neutral input terminal. The output terminal of the first three phase AC power supply is coupled with the input terminal of the delta circuit of the first antiparallel circuits and has a voltage lagged by .pi./2 behind the first power supply voltage. The output terminal of the second power supply of a star connection with the neutral point output terminal is coupled with the input terminal of the star circuit of the second antiparallel circuit. The polarities of the winding and the SCR connected in series are so set that the AC motor is driven by a power supply with about 2f (f is the frequency of the power supply voltage). The SCRs are fired at the same firing angle.
REFERENCES:
patent: 3732473 (1973-05-01), Johnston
patent: 3815004 (1974-06-01), Sommeria
patent: 3859577 (1975-01-01), Wiart
patent: 4008428 (1977-02-01), Waldmann
patent: 4054818 (1977-10-01), Risberg
patent: 4066938 (1978-01-01), Turnbull
patent: 4132931 (1979-01-01), Okuyama
Dobeck B.
Tokyo Shibaura Denki Kabushiki Kaisha
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