Electronic speed and slowing down control with intrinsic safety

Details Electronic speed and slowing down control with intrinsic safety Electronic speed and slowing down control with intrinsic safety

1981-05-15

1984-07-17

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Reversing

318732, 318758, H02P 322, H02P 320

Patent

active

044608624

ABSTRACT:
An electronic system is disclosed for controlling both the ascendant and the descendant speed in vertical machines such as cranes, elevators, etc., in which it is required to lift different loads in a regulated and self-controlled manner, laying aside the traditional mechanical and/or pneumatic control systems. Such control is achieved by virtue of the voltages included in the secondary of the motors of the wound rotor type used in such machines to lift or to bring down different loads, which may vary within a wide range from practically the vacuum to an overload, being possible by such control to select and to maintain both the ascendant and the descendant speed of the load.

REFERENCES:
patent: 3227937 (1966-01-01), Koppelman et al.
patent: 3348110 (1967-10-01), Koppelman
patent: 3699416 (1972-10-01), Sloan et al.
patent: 3810253 (1974-05-01), Vergara et al.
patent: 4140951 (1979-02-01), Greenhough

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