Hi g20313225, welcome to TFSA.
Can you give some more info about your question? You say you have a 4 KW generator, this would normally be labeled as a 4 KVA generator. Can your generator give a 4KVA output constantly or would this be the maximum power for a short duration?
Also you are looking for the maximum torque (τ max) in newton meters (Nm) is this a school or university type calculation? Torque is a simple product of a force being applied at an angle but can be a very complex calculation.
Are you perhaps looking for a required shaft power in Kilowatts so you can specify a correctly sized engine to drive the generator?
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