Electricity: motive power systems – With signals – meters – recorders or testing devices
Patent
1975-07-03
1977-05-24
Dobeck, B.
Electricity: motive power systems
With signals, meters, recorders or testing devices
318565, 318139, H02P 712
Patent
active
040258360
ABSTRACT:
In a thyristor chopper circuit used for the control of the rotational speed of an electric motor and provided with a protective system for preventing problems caused by a commutation failure in the chopper circuit, the protective system is provided with means for detecting the occurrence of commutation failure and means for certifying the operative condition or validity of the commutation failure detecting means. The operative condition certifying means is provided with means for supplying the commutation failure detecting means with a checking signal corresponding to a signal which is applied to the commutation failure detecting means upon the occurrence of the commutation failure so that whether the protective system is in a normally operative or valid condition can be certified at any time desired.
REFERENCES:
patent: 3166691 (1965-01-01), McGee
patent: 3588658 (1971-06-01), Sluys et al.
patent: 3601700 (1971-08-01), Collett et al.
patent: 3755724 (1973-08-01), Anderson
patent: 3818291 (1974-06-01), Miyake
patent: 3902105 (1975-08-01), Delaney et al.
patent: 3914675 (1975-10-01), Konrad
Katada Hirosi
Naito Shotaro
Dobeck B.
Hitachi , Ltd.
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