Question

1. Torque Questions If the co-energy of a synchronous machine is expressed as a. where K, lar-la, liu, and δ, are constants associated with the operating condition (i.) What is the expression for torque? (i.) Find the synchronous speed, as, at which constant torque will be produced. Hint:w t 0m The general expression for torque in an induction machine is T =-K-, sin(&J. For an induction motor, it can be shown that δ,--(90° + ø2) where O2 is the power factor looking into the rotor circuit from the air gap (see the circuit below). b. jX2 Assume that the controls to the induction motor can "effectively" change what the circuit parameters are (yes this is possible). Since the slip has to be non-zero to produce torque what would X: have to be changed to in order to ensure maximum torque per ampere? Toru It

Answer 1

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