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Consider an elementary two-pole rotating machine with a uniform (or smooth) air gap, as shown in Figure, inwhich the cylindrical rotor ismountedwithin the stator consisting of a hollow cylinder coaxialwith the rotor. The stator and rotorwindings are distributed over a number of slots so that their mmf can be approximated by space sinusoids. As a consequence of a construction of this type, we can fairly assume that the self-inductances Lss and Lrr are constant, but the mutual inductance Lsr is given by
Lsr = L cos θ
where θ is the angle between the magnetic axes of the stator and rotor windings. Let the currents in the two windings be given by
is = Is cos ωs t and ir = Ir cos(ωr t + α)
and let the rotor rotate at an angular velocity
ωm = θ rad/s
such that the position of the rotor at any instant is given by
θ = ωmt + θ0
Assume that the reluctances of the stator and rotor-iron circuits are negligible, and that the stator and rotor are concentric cylinders neglecting the effect of slot openings.
(a) Derive an expression for the instantaneous electromagnetic torque developed by the machine.
(b) Find the condition necessary for the development of an average torque in the machine.
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Q. Can you explain Twos complement addition? 2's Complement Addition Two's complement addition follows the same rules as binary addition. For example, 5 + (-3) = 2
Followings are some disadvantage a. Higher latching and holding current b.Higher on state voltage drop and power losses c.Higher gate current d.Higher gat
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Calculate the current flow in 30Ω resistor for the circuit in figure using Norton Theorem.
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Determine Total magnetic flux: A ring is composed of three sections. The cross-sectional area is 0.001 m2 for each section. The mean lengths of each section are l a = 0.3 m,
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