Eddy Current Drive For 20kw? Motor
Posted 30 July 2007 - 06:58 AM
My question is should I use the Eddy drive on another application and buy a replacement motor. Or should I consider the drive to be obsolete as Ive not seen any others on any other units that I have looked at.
Are Eddy drives efficient?
Posted 30 July 2007 - 07:52 AM
If you wish to vary the speed of the extruder, then the eddy current coupling is one means of doing this. One advantage of the eddy current coupling is that is essentially controls the torque so that transient loads are "torque limited". These were quite popular, but are not so popular any more due to the low cost of VFDs.
The eddy current drive has high slip losses when the speed is reduced and this results in lower efficiencies than can be achieved with a VFD. The slip losses are a function of the slip (difference in speed between the input and output) and the torque transferred from the input to the output.
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Posted 30 July 2007 - 08:51 AM
I think its probably best for me not to use it as I dont have spares nor the knowledge to correct the thing when its goes bad.
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