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I have designed a 4 pole three phase induction motor with very large airgap. We want to use it at very low speed range i.e below 50 rpm. At this moment we are in the simulation phase. For this purpose we are implying constant V/f technique. As intended operation is on very low frequency so we have to increase voltage to compensate satator resistance drop. Could anyone guide me in which ratio or according to which formula i should increase the terminal voltage keeping in mind the very large air gap and very precise torque around 1-2 Nm.