A.C. Machines: Electromagnetics and Design |
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3-phase airgap flux Alan Williamson B₁ Bapp Belt leakage Bgmax cage rotor calculated coil pitch coil-sides conductor constant copper loss core current density d-axis depth eddy currents eddy-current electric loading end-ring equation equivalent circuit F₁ field current flux barriers flux density flux distribution flux linkage flux per pole fundamental component fundamental flux geometry given gives gmax harmonic Hence impedance increases induction motor iron loss k₁ leakage flux leakage inductance leakage reactance magnetic circuit magnetic loading magnetic saturation magnetising current magnetising mmf magnetising reactance mmf required mutual inductance open-circuit output parameters peak fundamental per-unit permeance phase belt pole-pair produced q-axis ratio resistance rotor windings saliency Section short-circuit shown in Fig skew skin effect slot pitch stator and rotor stator current stator mmf stator phase stator slot stator winding sub-transient synchronous machines three-phase tooth torque transient unit length voltage X₁