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

Direct and indirect semiconductors, Direct and Indirect Semiconductors ...

Direct and Indirect Semiconductors 1) In a common quantitative calculation of band structures, the wave function of a single electron traveling by a perfectly periodic lattice

Differentiate between dual beam and dual trace oscilloscope, Q. How do you ...

Q. How do you differentiate between dual beam and dual trace oscilloscope? Sol. There are two separate vertical input channels A, B and these use separate attenuator and prea

Total debt to total assets ratio, Total Debt to Total Assets ratio A m...

Total Debt to Total Assets ratio A metric used to measure a company's financial risk by determining how much of the company's assets have been financed by debt. It is calculat

Energy, Explain different stage in energy audit?

Explain different stage in energy audit?

Functions of regulatory body, Functions of Regulatory Body Set sta...

Functions of Regulatory Body Set standards through setting codes, by miscellaneous orders, by license conditions and by directions in tariff orders; Determine the tari

Define waves and transmission lines, Q. Define waves and transmission lines...

Q. Define waves and transmission lines? In basic circuit theory we neglect the effects of the finite time of transit of changes in current and voltage and the finite distances

Power system, maxium capacity of genrators in practical use

maxium capacity of genrators in practical use

Use a 4-to-1 multiplexer to simulate nand logic function, Q. Use a 4-to-1mu...

Q. Use a 4-to-1multiplexer to simulate the following: (a) NAND logic function. (b) EXCLUSIVE-OR logic function. (c) Σ m (1, 2, 4).

Image processing, i have an assignment. please help me.

i have an assignment. please help me.

Show schematic arrangement of one- dimensional addressing, Q. Show the sche...

Q. Show the schematic arrangement for: (a) one- dimensional addressing, and (b) two-dimensional addressing, if a 32-kbit ROM is used to provide an 8-bit output word.

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