Apparatus for controlling an A.C. powered elevator

Details Apparatus for controlling an A.C. powered elevator Apparatus for controlling an A.C. powered elevator

1988-07-05

1989-07-25

Wong, Peter S.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363132, 187116, 187119, 318802, H02M 5458

Patent

active

048519820

ABSTRACT:
An apparatus for controlling an alternating current (A.C.) powered elevator includes a converter for converting A.C. power from A.C. power sources into direct current (D.C.) power and an inverter for converting the D.C. power into A.C. power of variable voltage and variable frequency. The converted A.C. power drives an induction motor to operate an elevator cage. The apparatus calculates a current command value from a speed command value and the speed of the motor and compares the current command value with the output current of the inverter. The apparatus further includes a conversion switch which produces an exciting current component switching command when operated and computing means for receiving the speed command value, a speed signal, and the exciting current component switching command and for calculating the current command value.

REFERENCES:
patent: 4546422 (1985-10-01), Okado
patent: 4615000 (1986-09-01), Fujii et al.
patent: 4624343 (1986-11-01), Tanahashi et al.
patent: 4629035 (1986-12-01), Tanahashi et al.
patent: 4640389 (1987-02-01), Kamaike
patent: 4667776 (1987-05-01), Nomura
patent: 4681191 (1982-07-01), Ikejima
patent: 4713595 (1982-12-01), Yonemoto
patent: 4719995 (1988-01-01), Ikejima
patent: 4742892 (1988-05-01), Iwata

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