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

Starting methods for polyphase induction motors, Starting Methods for Polyp...

Starting Methods for Polyphase Induction Motors When high starting torques are required, a wound-rotor induction motor, with external resistances inserted in its rotor circuits

Illustrate differential phase-shift keying, Q. Illustrate Differential phas...

Q. Illustrate Differential phase-shift keying? In order to eliminate the need of a local carrier, DPSK has been developed in which the receiver uses the received signal to act

Dc machines, singly excited magnetic systems

singly excited magnetic systems

Determine the node voltage, Determine the node voltage: Determine the ...

Determine the node voltage: Determine the node voltage V and then current flowing through each element by using KCL. Solution Apply KCL at the node whose voltage is V.

Differentiate between heat transfer and thermodynamics, Briefly Explain ...

Briefly Explain i. Importance of thermal diffusivity. ii. Describe the laws governing Heat Transfer. iii. Differentiate between Heat Transfer and Thermodynamics iv. Des

Schottky diodes - types of power diodes , Schottky  diodes The schot...

Schottky  diodes The schottky diodes have very fast recovery time and  low forward drop.  The current  ratings of  these diodes  vary  from 1A to 300 a and  maximum  allowable

Find the current in resistance, Q. Obtain the Thévenin and Norton equivalen...

Q. Obtain the Thévenin and Norton equivalent circuits for the portion of the circuit to the left of terminals a-b in Figure, and find the current in the 200- resistance.

Find out control voltage, Consider the network shown in Figure containing a...

Consider the network shown in Figure containing a voltage-controlled source producing the controlled current i c = gv, where g is a constant with units of conductance, and the con

For the low-pass filter configuration calculate cf, Q. For the low-pass fil...

Q. For the low-pass filter configuration of Figure, with R i = R f = 1M, calculate C f such that the 3-dB point is at 1 kHz.

Supernode, how does creating a supernode helps solve the problems?

how does creating a supernode helps solve the problems?

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