Control apparatus for A.C. elevator

Details Control apparatus for A.C. elevator Control apparatus for A.C. elevator

1986-03-26

1987-05-26

Miller, Charles D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 130

Patent

active

046677771

ABSTRACT:
A control apparatus for an A.C. elevator wherein regenerative power produced from an induction motor is consumed within the motor. In case of causing the induction motor to generate a braking torque, current to be supplied to the induction motor is controlled in accordance with a current command value having a frequency which does not generate regenerative power and an amplitude which is based on a torque command. Thus, the regenerative power is prevented from arising in the slowdown mode and unloaded operation of the elevator, and a good controllability is attained without spoiling a comfortable ride.

REFERENCES:
patent: 4475631 (1984-10-01), Nomura
patent: 4501343 (1985-02-01), Salihi
patent: 4545464 (1985-10-01), Nomura
patent: 4548299 (1985-10-01), Nomura
patent: 4602701 (1986-07-01), Tanahashi

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