B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
318/103, 364/23
B66B 1/30 (2006.01) B66B 5/02 (2006.01) H02M 7/757 (2006.01)
Patent
CA 1235237
INVENTORS: RAY STANYARD and HANSRUEDI LIECHTI INVENTION: CONVERTER-POWERED DRIVE FOR AN ELEVATOR ABSTRACT OF THE DISCLOSURE 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 charge-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 convertor 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. WWK:(01):rmw(ab):mnc8 - 2 -
487397
Liechti Hansruedi
Stanyard Ray
Ag Inventio
Perley-Robertson Hill & Mcdougall Llp
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