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

1986-06-23

1988-06-07

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Braking

318762, H02P 540

Patent

active

047499320

ABSTRACT:
An apparatus for controlling an A-C powered induction motor for an elevator cage, said apparatus comprising a rectifier for converting 3-phase A-C power into D-C electric power, an inverter connected to the rectifier for converting the D-C power into A-C power of variable voltage and variable frequency, a current detector connected to detect input current of the inverter, a power detector for detecting power supplied to the inverter based upon an output of the current detector, a control unit for generating a command signal to control the inverter in accordance with slip of the induction motor as determined by the power supplied to the inverter, and a correcting unit operable responsive to the power detected by the power detector for correcting the slip of the motor to maintain the power supplied to the inverter at predetermined values.

REFERENCES:
patent: 3718851 (1973-02-01), Graf et al.
patent: 4262241 (1981-04-01), Azusawa
patent: 4320332 (1982-03-01), Sugimoto
patent: 4405886 (1983-09-01), Williamson
patent: 4475631 (1984-10-01), Nomura
patent: 4599549 (1986-07-01), Mutoh et al.

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