Drive operating envelopes and induction machines, Electrical Engineering

Assignment Help:

Solve using data from the DC machine data sheet, using the "hot" resistance value for all calculations. Note that the value of K on the sheet is for rated (100%) field flux.  Assume that the machine can safely handle as much current as the power converter can deliver to it.  In addition, assume that all power  semiconductors are ideal with zero voltage drop when they are on. 

1. Consider a 2 hp, 850 rpm dc machine connected to a single-phase, fully-controlled thyristor bridge as shown in Fig. 2.9-4 (pg. 53), assuming that the series inductance is large enough to justify the assumption of infinite output inductance.  The amplitude of the ac voltage source is 210 Vrms, the maximum thyristor current is 10 A and the phase control angle α can be varied over the full range from 0 to π rad.  Assume that the maximum machine speed is 2000 rpm in either direction (i.e., ± 209.4 rad/s).  

a)  Plot the complete boundary envelope (i.e., capability curve) of the drive system's torque-speed operating capabilities on a set of T-ω axes, with torque T on the y-axis [in N-m] and speed ω on the x-axis [in rad/s].  Assume that the field flux is constant at its rated (100%) value.  In addition, assume that the maximum armature current is determined by the maximum thyristor current rather than the rated machine current based on its rated power.  Similarly, assume that the maximum applied armature voltage amplitude is determined by the maximum positive and negative rectifier output voltage (@α = 0 and α = π) rather than the rated machine voltage.  What are the torque, speed, machine shaft power, and phase control angle α at the four corners of the operating envelope?


Related Discussions:- Drive operating envelopes and induction machines

Nash equilibrium matlab code, Can someone please guide me on how to compute...

Can someone please guide me on how to compute a nash equilibrium in matlab

Calculate the induced voltage, Q. A four-pole, lap-wound armature has 144 s...

Q. A four-pole, lap-wound armature has 144 slots with two coil sides per slot, each coil having two turns. If the flux per pole is 20 mWb and the armature rotates at 720 r/min, cal

Pinch off voltage, Pinch off Voltage: The current in N-JFET because of...

Pinch off Voltage: The current in N-JFET because of a small voltage V DS  is described by: I DSS = (2a) W/L (qN d μ n V DS ) In which 2a  = channel thickness

What is a control word, What is a control word? It is a word kept in a ...

What is a control word? It is a word kept in a register (control register) used to control the operation of a program digital device.

EEE, ferroelectric materials are charatrised by

ferroelectric materials are charatrised by

Dc machince, what ''s part of dcmotor or dc generator

what ''s part of dcmotor or dc generator

Find the torque supplied to the mechanical load, Q. The machine of Problem ...

Q. The machine of Problem can be used as a motor. Let the terminals of the coil be connected to a voltage source of 1 kV rms. If the motor runs at 1800 r/min and draws a current of

Construction - unijunction transistor, Construction - UniJunction Transisto...

Construction - UniJunction Transistor: Construction: The basic structure of uni junction transistor is shown in fig. (a). It essentially consists of a lightly doped N type s

State advantages of washing machine, State advantagesof Washing machine ...

State advantagesof Washing machine Main advantages are that these washing machines are fully automatic (wash programs are fully stored) it makes them easy to use, they are chea

Domestic financial system, Q. "Developing countries could delay opening the...

Q. "Developing countries could delay opening the capital account until the domestic financial system is strong enough to withstand the sometimes flow of world capital and violen

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