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Electrical MachinesElectric Drives (Fundamentals) Principles . Motor Action Michael Faraday showed that passing a current through a conductor freely suspended in a fixed magnetic field creates a force which causes the conductor to move through the field.
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An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts an outside stator having coils supplied with alternating current to produce a rotating magnetic field and an inside rotor attached to the output shaft producing a second rotating magnetic field. The rotor magnetic field may be produced by permanent magnets reluctance
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Representation of AC machine dynamics by complex signal flow graphs Article (PDF Available) in IEEE Transactions on Industrial Electronics 42(3) 263271 · July 1995 with 54 Reads
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HOLTZ THE REPRESENTATION OF AC MACHINE DYNAMICS BY COMPLEX SIGNAL FLOW GRAPHS 265 currents i and zp as state variables. The root locus plot in Fig. 2(d) shows that two real eigenvalues exist they are both located at -1/r provided the back EMF is independent from the stator current. The eigenvalues underline the characteristics
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The total torque produced by the machine is the sum of torque due to positive and negative sequence voltage. When the rotor has high resistance then the net torque is negative and the braking operation is obtained. Assume the phase A of the star connected motor is open circuited. Then the current flow through the phase A becomes zero i.e.
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The Representation of AC Machine Dynamics by Complex Signal Flow Graphs Joachim Holtz Fellow IEEE University of Wuppertal 42097 WuppertalGermany Abstract — Induction motors are modelled by nonlinear higher-order dynamic systems of considerable complexity. The dynamic analysis based on the complex notation exhib-
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A flow is classified as one two or three dimensional based on the number of space coordinates required to specify the velocity field. Although most flow fields are inherently three dimensional analysis based on fewer dimensions are meaningful. Consider for example the steady flow through a long pipe of constant cross section (refer Fig1.6a).
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HOLTZ THE REPRESENTATION OF AC MACHINE DYNAMICS BY COMPLEX SIGNAL FLOW GRAPHS 265 currents i and zp as state variables. The root locus plot in Fig. 2(d) shows that two real eigenvalues exist they are both located at -1/r provided the back EMF is independent from the stator current. The eigenvalues underline the characteristics
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Indication of Laminar or Turbulent Flow The term fl tflowrate shldbhould be e reprepldbR ldlaced by Reynolds number where V is the average velocity in the pipe and L is the characteristic dimension of a flow.L is usually D R e VL / (diameter) in a pipe flow. in a pipe flow. --> a measure of inertial force to the > a measure of inertial force to the
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If the current is AC the two slip rings are required to create an AC motor. An AC motor is shown in Figure 11.7. Figure 11.7 Layout of an alternating current motor. If the current is DC split-ring commutators are required to create a DC motor. This is shown in Figure 11.8. Figure 11.8 Layout of a direct current motor. Real-life applications
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