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V / F Control Of Three Phase Induction Motor

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Dear Technocrats


I have a problem for design and improvement.


A 3-phase Induction motor, 8-poles, 60-Hz, 440V operated in a V/F mode, The stator resistance is 0.14 ohms, Assume that operation is at rated frequency and voltage to deliver Maximum Torque of 1000N-m, and that the rotor resistance is 0.21 ohms.


1) How to find the leakage inductance of the motor's equivalent circuit?


2)How to the minimum frequency which still allows the motor to reach maximum torque?


Friends please give your valuable guidance to work is problem and If possible please suggest me some books, I have already referred some of the books, still unable to solve the problem. Your valuable suggestion is highly appreciated.


thanks and best regards




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