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

Find the meter reading for a sine wave, Q. ADMM (digital multimeter) reads ...

Q. ADMM (digital multimeter) reads true rms values of current. If the peak value of each of the following periodic current waves is 5 A, find the meter reading for: (a) a sine wave

Explain the working of rectifier circuits, Q. Explain the working of Rectif...

Q. Explain the working of Rectifier Circuits? A simple half-wave rectifier using an ideal diode is shown in Figure(a). The sinusoidal source voltage v S is shown in Figure (b)

Electric helicopter, examples in building electric helicopter using cardboa...

examples in building electric helicopter using cardboard, balsa wood, scotch tape, glue, binder clips, rubber bands, rubber stoppers, etc. attached to a 12v power supply

How to make lpg safer in the laboratory, How to Make LPG Safer in the Labor...

How to Make LPG Safer in the Laboratory The following must be observed in the laboratory: 1. The LPG cylinders should be kept outside the laboratory in a ventilated room.

Designing 100 line exchange using uni-selector, Q. Designing 100 line excha...

Q. Designing 100 line exchange using Uni-selector? Here three different designing methods for 100 line exchange are discussed: Design: Strowger switching system is designe

Dcr decrement instruction , DCR  Decrement Instruction This instructi...

DCR  Decrement Instruction This instruction  is used to decrement  the contents of any  register or memory  location by one. There are two  formats.

Illustrate the basic concept of machine cell design, a) Write short notes o...

a) Write short notes on part feeding devices and transfer mechanism. b) Explain with example automation for machining operation with relevant diagrams. c) discuss different p

Radio communication engineering, how electromagnetic wave transmitted from ...

how electromagnetic wave transmitted from the ground are bent back towards the earth when they enter a layer of ionosphere?

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