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Figure shows in schematic cross section a salient-pole Figure shows in schematic cross section a salient-pole synchronous machine having two identical stator windings a and b on a laminated steel core. The salient-pole rotor is made of steel and carries a field winding f connected to slip rings. Because of the non-uniform air gap, the […]

Figure shows an inductor wound on a laminated iron core of Figure shows an inductor wound on a laminated iron core of rectangular cross section. Assume that the permeability of the iron is infinite. Neglect magnetic leakage and fringing in the two air gaps (total gap length = g). The N-turn winding is insulated copper […]

The design of a four-pole, three-phase, 230-V, 60-Hz induction The design of a four-pole, three-phase, 230-V, 60-Hz induction motor is to be based on a stator core of length 21 cm and inner diameter 9.52 cm. The stator winding distribution which has been selected has a winding factor kw = 0.925. The armature is to […]

Figure shows a two-phase hybrid stepping motor with castleated p Figure shows a two-phase hybrid stepping motor with castleated poles on the stator. The rotor is shown in the position it occupies when current is flowing into the positive lead of phase 1. a. If phase one is turned off and phase 2 is excited […]

Field-oriented torque control is to be applied to the permanent- Field-oriented torque control is to be applied to the permanent-magnet synchronous motor of Problem 11.18. If the motor is to be operated at 4000 r/min at rated terminal voltage, calculate the maximum torque and power which the motor can supply and the corresponding values of […]

Figure shows a circularly symmetric system in which a moveable Figure shows a circularly symmetric system in which a moveable plunger (constrained to move only in the vertical direction) is supported by a spring of spring constant K = 5.28 N/m. The system is excited by a samarium-cobalt permanent-magnet in the shape of a washer […]

Design calculations show the following parameters for a three-ph Design calculations show the following parameters for a three-phase, cylindrical-rotor synchronous generator: Phase-a self-inductance Laa = 4.83mH. Armature leakage inductance Lal = 0.33mH. Calculate the phase-phase mutual inductance and the machine synchronous inductance. Is this the question you were looking for? If so, place your order […]

The following data are obtained from tests on a 145-MVA, The following data are obtained from tests on a 145-MVA, 13.8-kV, three phase, 60-Hz, 72-pole hydroelectric generator. Open-circuit characteristic: Short-circuit test: If = 710 A, Ia = 6070 A a. Draw (or plot using MATLAB) the open-circuit saturation curve, the air-gap line, and the short-circuit […]

Draw the steady-state, direct- and quadrature-axis phasor Draw the steady-state, direct- and quadrature-axis phasor diagram for a salient-pole synchronous motor with reactances Xd and Xq and armature resistance Ra. From this phasor diagram, show that the torque angle d between the generated voltage Eaf (which lies along the quadrature axis) and the terminal voltage Vt […]

The coils of the magnetic circuit shown in figure are The coils of the magnetic circuit shown in figure are connected in series so that the mmf’s of paths A and B both tend to set up flux in the center leg C in the same direction. The coils are wound with equal turns, N1 […]