Apparatus and process for determining the instantaneous and cont

Details Apparatus and process for determining the instantaneous and cont Apparatus and process for determining the instantaneous and cont

1997-04-17

1999-01-12

Noori, Max H.

Measuring and testing

Dynamometers

Responsive to force

73862193, G01L 104

Patent

active

058593730

ABSTRACT:
A process and apparatus for determining a load on a lifting mechanism including a load measuring device and a three-phase induction motor operable for lifting and lowering the load. The effective power consumption of the induction motor is determined by the load measuring device based on a measured current and measured voltage of the induction motor. The measured effective power consumption is then compared with a reference power, which is calculated as the power output of the induction motor driving a nominal load of the lifting mechanism, to calculated an instantaneous load on the lifting mechanism. The inventive apparatus and process advantageously requires no modifications or additions to load carrying parts of a lifting mechanism or carrying gear and provides accurate real time measurement of the load.

REFERENCES:
patent: 4060841 (1977-11-01), Allen
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patent: 4423785 (1984-01-01), Kuihara et al.
patent: 4623041 (1986-11-01), Horbriiger et al.
patent: 4979401 (1990-12-01), Maeda
Article entitled "Ein einfaches elektrisches Lastme.beta.gerat auf Kranen" Kirmenschrift der AEG, Sonderdruck aus Hansa, Zentralorgan fur Schiffahrt-Schiffbau, H. 25.26 (1959) by K. Botz, pp. 1291-1292.

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