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Lumped Electromechanical Elements
Electromechanical Coupling with Viscous Fluids 861
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air gap ampliﬁer amplitude angle armature assume boundary condition capacitor Chapter charge density circuit coenergy coil conductor constant contour coordinate system coupling system current density damping deﬁned deﬁnition deﬂection differential equations displacement dynamics electric ﬁeld intensity electric ﬁeld system electric origin electrical terminal pairs electrical terminal relations electromagnetic electromechanical electromechanical coupling electromechanical systems energy equations of motion example excitation expression ﬁnd ﬁrst term ﬁxed ﬂow ﬂux density ﬂux linkage force density force f force of electrical frequency function Hence homopolar illustrated induction machines induction motor inertia integral lumped-parameter magnetic ﬁeld system magnetic material mass motor mutual inductance node nonlinear obtain operation pendulum plates plunger polarization density position quasi-static reactance resistance result rotating machines salient-pole satisﬁed Section shown in Fig signiﬁcance sinusoidal static equilibrium stator stator winding steady-state surface synchronous machine terminal voltage torque torsion spring two-phase variables vector write zero