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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.
A transistor has (A) One p-n junction. (B) Two p-n junction. (C) Four p-n junction. (D) Five p-n junction. Ans: A transistor has two p-n junctions.
a. Given a timer with a terminal count and a clock frequency of 10 MHz measure the following: (i) Range & Resolution (ii) Terminal count values needed to measure 3ms interval
Q Explain about 'Darlington Amplifier'? DARLINGTON AMPLIFIER : A CC stage followed by another CC stage has an input resistance of about (b + 1) 2 times the emitter resistance
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There are many advantages of PLC a.The PLC was specifically designed for harsh conditions with electrical noise magnetic fields vibration extreme temperatures or humidit
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