Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
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
Duncanson Jr. W. E.
Mitsubishi Denki & Kabushiki Kaisha
Shoop Jr. William M.
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