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The question i'm having trouble with is:
Calculate the speed of the rotor of a 6 pole induction motor with a slip of 2.2%. The motor is connected to a 230V single-phase supply.
I am familiar with the table below and a certain formulae but i'm doing something incorrect and am confused on how to tackle this question.
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Any formulaes or help would be appriciated as I am really stuck
iant, as with any drive/motor/load system, you need to understand the torque/speed requirements of the load before sizing anything.
Since this is a hoist application, it should be fairly easy to quantify that data. If the wound rotor motor was routinedly being taken to 220% torque at near zero speed, then, yes, the VFD will have to be sized to accommodate that. But, if the peak torque is less than that, then the VFD sizing can come down into more normal ranges (150%, 110%, 100%, etc.)
I think, as a general rule, I would provide a minimum of 150% overcurrent capacity on a hoist whether it needed it or not. Two years down the road, that hoist may need to be used for something completely different than today and the extra capacity would be much appreciated.
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