Find instantaneous electromagnetic torque, Electrical Engineering

Assignment Help:

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.

 

2125_Find instantaneous electromagnetic torque.png


Related Discussions:- Find instantaneous electromagnetic torque

Assignment, design a half wave bridge rectifier to perform the function ind...

design a half wave bridge rectifier to perform the function indicated

Define the xor gate - microprocessor, Define the XOR GATE - Microprocessor?...

Define the XOR GATE - Microprocessor? The XOR GATE is a alike to an OR gate except for the instance when all the inputs are high. With a XOR gate when all the inputs are high t

Electromagnetic torque, The torque produced by each conductor in the field ...

The torque produced by each conductor in the field will be:  where A is the area of the armature winding in the magnetic field, Ia is the current in armature winding, and B

Explain total internal reflection, Explain Total internal reflection? T...

Explain Total internal reflection? The refractive index of a medium is defined as the ratio of velocity of light in vacuum to the velocity of light in that medium n x = C/V

Microprocessor, highest priority interrupt in 8085 microprocessor

highest priority interrupt in 8085 microprocessor

What are the signals involved in memory bank selection, What are the signal...

What are the signals involved in memory bank selection in 8086 microprocessor? The 8086 based system will have two sets of memory IC's. One set for even bank and another for od

#titl optimal power flow , to get PV curve i want optimal power flow progra...

to get PV curve i want optimal power flow program in matlab

Electric machinery fundamentals, Ask qu1. If the resistor Radj is adjusted ...

Ask qu1. If the resistor Radj is adjusted to 175O what is the rotational speed of the motor at no-load conditions? 2. Assuming no armature reaction, what is the speed of the motor

Magnetism, with the aid of the diagram explain the following rules that can...

with the aid of the diagram explain the following rules that can be used to determine the direction of magnetic fields around a current carrying conductor (1)cork screw rule (2)rig

Illustrate the photo-conductive cell, Illustrate in detail digital encoders...

Illustrate in detail digital encoders. Illustrate the following with their application: Photo-conductive cell Photo-voltaic cell

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd