Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1985-07-29
1987-06-09
Shoop, Jr., William M.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 132
Patent
active
046713905
ABSTRACT:
A twelve-pulse converter has an a.c.-input and a d.c.-output which is connected with an armature via two thyristors of a change-over circuit. An extinguishing circuit comprises a resistor, a capacitor, an inductor and a thyristor which is also connected with the armature via related diodes. A current transformer in the armature circuit causes ignition of the thyristor in the extinguishing circuit at the occurrence of excess current. The extinguishing capacitor is continuously connected with a charging circuit and is connected parallel to the thyristor of the extinguishing circuit and with the thyristors connected to the d.c.-negative pole. The d.c.-negative pole connected thyristors are cut-off when the thyristor of the extinguishing circuit is ignited and the energy appearing in the armature circuit is dissipated by the resistor in the extinguishing circuit. The zero-crossing of the current is detected by means of two voltage converters which are connected with the d.c.-negative pole and the d.c.-positive pole of the converter as well as with the armature. The non-current conducting thyristors which are connected either with the d.c.-negative pole or with the d.c.-positive pole, are ignited by means of information derived from the voltage converters.
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Publication by A. Z. Walach, "Automatic Loop-Gain Regulation", IBM Technical Disclosure Bulletin, vol. 13, No. 10, pp. 2904-2906, Mar. 1971.
Liechti Hansruedi
Stanyard Ray
Blum Richard K.
Inventio AG
Kleeman Werner W.
Shoop Jr. William M.
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