B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/23
B66B 1/28 (2006.01) B66B 1/30 (2006.01) H02P 7/298 (2006.01)
Patent
CA 1040762
ABSTRACT OF THE DISCLOSURE One or more solid-state static converters change a first current frequency to a second current frequency such as, for example, A.C. to D.C., D.C. to A.C., or A.C. of one frequency to A.C. of another frequency such as in a cyclo- converter or the like, and operates a motor to drive a traction sheave to control the movement of an elevator car. In one embodiment, a first solid-state static converter receives a three-phase A.C. input and directly supplies current to a motor armature circuit to control the movement of the elevator car in response to an error signal derived by the summation of a speed signal from a tachometer and a vehicle speed command signal while a second solid-state static converter receives a three-phase A.C. input and directly supplies current to a field circuit of the motor in response to the operation of a field gating control circuit. With A.C. operation, three gating channels corresponding to the three source phases provide summing circuits receiving alternating phase reference signals through lead-lag filtering circuits, disable signals responsive to the source phases through lag filtering circuits, constant reference signals for continually providing sixty electrical degrees of conduction of the controlled rectifiers during each source cycle and providing a predetermined field current, and a field energy command signal supplied from a second summing circuit. A command signal supplied by the system supervisory control, a field current indicative feedback signal and an armature current indicative signal are directly summed at the second summing circuit to provide the field energy command signal to the first summing circuit. -0-
224535
Armor Elevator Canada Limited - Armor Ascenseur Canada Limitee
Na
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