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

1988-05-18

1989-03-28

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

318807, B66B 130

Patent

active

048155675

ABSTRACT:
An apparatus for controlling an A.C. powered elevator is provided to reduce a primary current frequency to an induction motor to be smaller than a specific value when the motor is switched from a power drive to a brake mode of operation. In other words, the frequency after the motor is switched to the brake mode is reduced to be lower than the frequency at which the machine input power to the induction motor is equal to the internal power consumption of the induction motor.

REFERENCES:
patent: 4366427 (1982-12-01), Walker et al.
patent: 4548299 (1985-10-01), Nomura
patent: 4625159 (1986-11-01), Ikejima
patent: 4748394 (1988-05-01), Watanabe

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