Container Crane Drives
Container Crane Drives
(OP)
Anyone with any experience of supplying large (1000 to 2500kVA) container cranes from diesel generators? Particulary interested in rejeneration effects.
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RE: Container Crane Drives
The reason is that a diesel machine cannot receive much power during regeneration and that will be catastophic when lowering containers.
A braking resistor is OK in applications where lowering a heavy object is done occasionally. But a container crane shall do it continously. And that will require a heavy resistor and it will produce a lot of heat.
A container crane usually has a motor between 250 kW up to 800 kW (not counting boom, gantry, trolley etcetera - just hoisting motor). There are the newer (Chinese) cranes with dual hoisting motors that, if I remember right, have two motors around 600 kW.
The problem is the same with a hydraulic drive. The diesel cannot receive the energy and you need to use hydraulic means to absorb it. With large coolers.
But, if this is a temporary need and if you can tolerate slower goods handling and a large braking resistor and a rather high energy bill then, of course, it can be done. It is done in mobile cranes, and they are used to handle containers in some harbours.
Are the motors DC or AC?
Gunnar Englund
www.gke.org
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