B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/28
B66B 1/32 (2006.01) B66B 1/28 (2006.01)
Patent
CA 1040763
TRANSPORATION SYSTEM WITH BRAKE CONTROL AND COMBINED BRAKE AND FIELD POWER SUPPLY ABSTRACT OF THE DISCLOSURE A solid-state static power converter changes 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 response to an error signal derived by the selective summation of a speed signal from a tachometer and a vehicle speed command signal. In one embodiment, a combined solid-state static power converter receive a three- phase A.C. input and directly supplies direct current to a field circuit of the motor in response to the operation of a field gating control circuit and also directly supplies direct current to a brake operating solenoid circuit controlling a friction braking element selectively coupled to an output shaft of the motor. The combined field and brake static power converter includes three controlled rectifying devices and three diodes connected to selectively supply half-wave rectified uni-directional power to the field circuit while a fourth controlled rectifier is connected to one of the phases and cooperates with one or more of the diodes utilized in the field current conversion together with one field output lead to supply uni-direction energy to the brake solenoid. The brake gating control includes a summing circuit receiving an alternating phase reference signal from the source through a lag filter circuit, a disable signal from the source through lead and lag filtering circuits, a constant reference signal, and a brake energy command signal supplied from a second summing circuit. The second summing circuit receives a brake lifting command signal in response to the supervisory control and a brake energy sensed feedback signal. -0-
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