Elevator control apparatus

Details Elevator control apparatus Elevator control apparatus

1985-02-26

1986-11-18

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 500

Patent

active

046230424

ABSTRACT:
An elevator control apparatus wherein a primary current of an induction motor is controlled separately for a component parallel to a secondary interlinking magnetic flux and a component orthogonal thereto, comprising means to generate a correction signal having a predetermined frequency, phase and magnitude which cancel a magnetic flux ripple of the induction motor attributed to a shaft deflection of a hoisting machine caused by action of an elevator load, the correction signal from the means being superposed on either of the components parallel and orthogonal to the secondary interlinking magnetic flux so as to control the primary current. Thus, even when the shaft deflection is involved, a control free from any torque ripple is permitted, and an elevator of comfortable ride can be realized.

REFERENCES:
patent: 4027745 (1977-06-01), Watanabe
patent: 4030570 (1977-06-01), Caputo
patent: 4086983 (1978-05-01), Anzai et al.
patent: 4269286 (1981-05-01), Ishii et al.
patent: 4271931 (1981-06-01), Watanabe
H. Sugimoto and E. Ohno, "Theory and Characteristics of a New Induction Motor Drive System Having Linear Transfer Function", Mar. 1983, International Power Electronics Conference.

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