Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1978-08-25
1980-06-24
Dobeck, B.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318317, 318318, 318432, H02P 2902
Patent
active
042097339
ABSTRACT:
A motor control apparatus to supply current from a D-C source to an electric motor has a thyristor chopper circuit, the duty factor of which is controlled depending on a current instruction signal. The thyristor chopper circuit is provided between the terminals of the D-C source in series with an electric motor, and has main and auxiliary thyristors. A series connection of a capacitor and a reactor, forming commutating elements, is connected across the auxiliary thyristor and oscillates to generate a pulse of current through a forward diode in order to turn off the main thyristor when the auxiliary thyristor is turned on. In addition, a saturable current transformer is so provided that through a primary winding thereof chopper current flows, and the secondary winding operates as the reactance of the commutating elements. Current flowing through the secondary winding therefore depends on the chopper current flowing through the primary winding.
REFERENCES:
patent: 3593089 (1971-07-01), Appelo
patent: 3660738 (1972-05-01), Anderson et al.
patent: 3678360 (1972-07-01), Minarik et al.
patent: 3757180 (1973-09-01), Subler
patent: 3777237 (1973-12-01), Anderson
patent: 3854076 (1974-12-01), Lambert
patent: 3875486 (1975-04-01), Barton
patent: 4052625 (1977-10-01), Cameron
patent: 4057752 (1977-11-01), Artrip et al.
patent: 4124812 (1978-11-01), Naito et al.
R. E. Morgan, "Time Ratio Control with Combined SCR and SR Commutation", IEEE Trans. on Communications and Electronics, vol. 83, pp. 366-371, 7-1964.
W. McMurray, "Silicon-Controlled Rectifier D-C to D-C Power Converters," IEEE Trans. on Communications and Electronics, vol. 83, pp. 198-203, 3-1964.
Ibamoto Masahiko
Narita Hiroshi
Toyama Jinichi
Dobeck B.
Hitachi , Ltd.
LandOfFree
Motor control apparatus with an improved thyristor chopper circu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Motor control apparatus with an improved thyristor chopper circu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor control apparatus with an improved thyristor chopper circu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1482209