Patent ID: 7907045
Filing Date: 2011-03-15
Classification: B66D

Abstract:
1. A hoisting machine having a load hoisting motor, a speed reduction mechanism and a regenerative braking resistor and driving said load hoisting motor with an inverter incorporated in a hoisting machine main body and further passing an electric current generated by said load hoisting motor during lowering of a lifted load through said regenerative braking resistor to apply regenerative braking, which is characterized by comprising: a heat dissipation means that dissipates heat generated from said inverter to a speed reduction mechanism casing that houses said speed reduction mechanism; said regenerative braking resistor having a resistor casing comprising a corrugated metal plate and a flat metal plate that are superimposed over each other, said corrugated metal plate having an obverse surface with a concave-convex corrugated configuration and a reverse surface with a convex-concave corrugated configuration corresponding to said concave-convex corrugated configuration; wherein resistance elements are disposed in concave spaces at a reverse side of the corrugated metal plate of said resistor casing, and an insulating material is filled in a space between said corrugated metal plate and said flat metal plate, including the concave spaces at the reverse side of said corrugated metal plate.