Elevator speed control system

Details Elevator speed control system Elevator speed control system

1975-12-29

1977-10-04

Hohauser, Herman J.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318227, 187 29R, B66B 130

Patent

active

040526518

ABSTRACT:
In an elevator speed control system, the actual speed signal from an induction motor is subtracted from a command speed signal and then supplied to a nonlinear circuit. The circuit produces an output voltage approximately proportional to the square root of its input voltage. The output voltage is applied to three phase shifters, one for each phase of a three-phase system, to produce firing signals to control the conduction of associated thyristors resulting in the control of a three-phase voltage applied to the motor and therefore its rotational speed.

REFERENCES:
patent: 3866097 (1975-02-01), Anzai et al.
patent: 3948357 (1976-04-01), Maynard et al.
patent: 3973175 (1976-08-01), Anzai et al.

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