Process and device for monitoring and controlling the speed of r

Details Process and device for monitoring and controlling the speed of r Process and device for monitoring and controlling the speed of r

1995-10-25

1998-10-06

Sircus, Brian

Electricity: motive power systems

Constant motor current, load and/or torque control

318743, 318759, 318802, 318376, H02P 700

Patent

active

058181857

ABSTRACT:
A process and a device for monitoring and/or controlling the speed of rotation of an electric drive having an asynchronous motor equipped with a braking device (11) and connected via a frequency adapter (13) to an alternating current system (12), e.g. three-phase system, to provide safe lifting and lowering of a load. The maximum torque (16) produced by the drive for lifting the load is set to be smaller than a holding torque (17) needed by the braking device (11) to hold the load in a stationary position.

REFERENCES:
patent: 4145645 (1979-03-01), Price et al.
patent: 4272706 (1981-06-01), Somerville
patent: 4278150 (1981-07-01), Wehrli, III et al.
patent: 4402387 (1983-09-01), Tsuji et al.
patent: 4501343 (1985-02-01), Salihi
patent: 5167400 (1992-12-01), Gazel-Anthoine
patent: 5361565 (1994-11-01), Bayer
patent: 5373121 (1994-12-01), Nagel

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