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

Discuss need of pipelining, Discuss need of Pipelining. The simplest m...

Discuss need of Pipelining. The simplest method for improving performance by hardware parallelism is pipelining. Pipelining has breaking up the operations to be performed in s

Motor: power production, The mechanical power produced at the armature of a...

The mechanical power produced at the armature of a motor is: P = T a . (power is in watts if torque is N.m and    in rad/sec). Some of this will be lost due to friction and

What are concentrators, Q. What are concentrators? Elucidate how it helps i...

Q. What are concentrators? Elucidate how it helps in connecting number of subscribers. Ans: In rural areas, subscribers are usually dispersed. It is both expensive and unn

Draw the logic diagram of the enabled d latch, Q. (a) Draw the logic diagra...

Q. (a) Draw the logic diagram of the enabled D latch using only NAND gates. (b) Complete the timing diagram of Figure (a) of theDlatchwhose block diagram and truth table are giv

Mode1 - power supplies , Mode1 When the positive  pulse  from PWM  is a...

Mode1 When the positive  pulse  from PWM  is applied to the transistor Q shown  in figure  it gets  turned  on. In  this condition current  flows  through  transistor Q and.

What do you maen by debugger, What do you maent by Debugger? Debugger:...

What do you maent by Debugger? Debugger: This is a program that allows user to debug and test programs. All computers with microprocessor kits give debugging facility. To not

Multiplexed address data bus - pins and signals , Multiplexed Address/ Data...

Multiplexed Address/ Data Bus Pins AD 7 - AD) are used for multiplexed address data bus. This bus is bidirectional  input output  and  serves two  purpose. Initially the bus

Binary number system - number systems , Binary  Number Systems As men...

Binary  Number Systems As mentioned  earlier this  number is used by  digital  systems like  microprocessor  and other  digital  circuits. This  number  systems  use only two

Compare mosfet with jeft, Compare MOSFET with JEFT ? a. In enhancement ...

Compare MOSFET with JEFT ? a. In enhancement and depletion types of MOSFET, the transverse electric field induced across an insulating layer deposited on the semiconductor mate

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