Synchronous Generator with Distributed Winding: Synchronous Generator with Distributed Winding – It may be seen from Eq. (5.7) that the flux/pole is limited by the machine dimensions and the peak flux density which cannot exceed a specified value dictated by saturation characteristic of iron. Therefore, for inducing an emf of an appropriate value in a […]
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EMF Equation of AC Winding: The B-wave of a EMF Equation of AC Winding synchronous machine (in general multi-polar) assumed sinusoidal is drawn in Fig. 5.15 and a single full-pitched coil (coil-side space separation π rad (180°) elect.) is shown in cross-sectional form. The B-wave moves towards left with a speed of ω elect. rad/s
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2 Pole Elementary DC Machine: Figure 5.13 shows a 2 Pole Elementary DC Machine with a single coil rotating armature. It may be seen that the field winding is stationary with salient poles whose pole-shoes occupy a major part of the pole-pitch. An alternating emf is induced in the coil due to rotation of the
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Three Phase Synchronous Generator: Practical synchronous generators are always of the 3-phase kind because of the well-known advantages of a 3-phase system. If two coils were located at two different space locations in the stator of Fig. 5.2, their emfs will have a time phase difference corresponding to their electrical space displacement. In Three Phase
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Synchronous Machine Working Principle: Figure 5.2 shows the simplified version of an ac Synchronous Machine Working Principle with a 2-pole field winding on the rotor and a single coil aa’ on the stator. This type of rotor poles are known as salient (projecting) poles; and are excited by means of dc fed to the concentrated
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Rotating Electrical Machines: We Know that electromechanical energy conversion takes place whenever a change in flux is associated with mechanical motion. Speed voltage is generated in a coil when there is relative movement between the coil and magnetic field. Alternating emf is generated if the change in flux linkage of the coil is cyclic. The
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Dynamical Equations of Electromechanical Systems: Dynamical Equations of Electromechanical Systems – Figure 4.19 shows an electromagnetic relay whose armature is loaded with spring K, damper B, mass M and a force generator F. Figure 4.20 shows the abstracted diagram of a general Dynamical Equations of Electromechanical Systems. It is easily noticed that the electromechanical device
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Electromechanical Energy Conversion via Electric Field Energy: Electromechanical energy conversion via the electric field is analogous to the magnetic field case studied earlier. Charge in the Electric Field Energy is analogous to flux linkages and voltage to current in the magnetic field case. Figure 4.18 shows a parallel plate condenser with a fixed and a
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Forces in system with Permanent Magnets: Method of finding Forces in system with Permanent Magnets is best illustrated by an example. Figure 4.17(b) shows a moving armature relay excited by a permanent magnet (PM). The dc magnetizing curve of the permanent magnet is drawn in Fig. 4.17(a) which upon linear extrapolation at the lower B-end
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Multiply Excited Magnetic Field System: Multiply Excited Magnetic Field System – Singly-excited devices discussed earlier, are generally employed for motion through a limited distance or rotation through a prescribed angle. Electro-mechanical transducers have the special requirement of producing an electrical signal proportional to forces or velocities or producing force proportional to electrical signal (current or
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