Control system for a transportation system

Details Control system for a transportation system Control system for a transportation system

B - Operations, Transporting

66

B

364/32

B66B 1/30 (2006.01) B66B 1/16 (2006.01) H02P 7/298 (2006.01)

Patent

CA 1042577

CONTROL SYSTEM FOR A TRANSPORATION SYSTEM Abstract of the Disclosure A solid state static 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 freqency to A.C. of another freqency such as in a cyclo- converter or the like, and operates a motor driving a traction sheave to control the movement of an elevator car. The magnitude and direction of the current output from the static converter is controlled by an error signal derived by the summation of a speed signal obtained from a tachometer coupled to the motor drive shaft and a vehicle speed command signal provided by a pattern generator and having maximum velocity, acceleration and rate of change of acceleration limitations for safe and smooth control of the elevator car and for accurate stopping at landings. -0-

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