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

Single direction pump, Modify the design of the circuit shown in FIGURE and...

Modify the design of the circuit shown in FIGURE and draw a circuit diagram to provide rotary actuation in both directions using a single direction pump (to replace the bi-directio

Visual presentation of an electrical network, Visual Presentation of an Ele...

Visual Presentation of an Electrical Network: The second layer corresponds to the distribution network coverage. The low voltage system and customer supply points along with l

Demodulation of ssb signals, Demodulation of SSB signals also requires the ...

Demodulation of SSB signals also requires the use of a phase-coherent reference. Figure shows the general configuration to demodulate the SSBsignal.Asmall carrier component, which

Disaster management, role of electrical engineer in disaster management

role of electrical engineer in disaster management

Why fet is called a voltage-controlled device, Q. Why FET is called a volta...

Q. Why FET is called a voltage-controlled device? Why its input resistance is high? In the case of a FET the output current ID is a function of the voltage VGS applied to the i

What is the maximum entrance angle max, Calculate the N.A of a step index f...

Calculate the N.A of a step index fibre having n 1 =1.48 and n 2 =1.46. What is the maximum entrance angle ψ max for this fibre if the outer medium is air with n 1 =1.0? Given

How an electroscope charged without contacting charged body, An electroscop...

An electroscope charged WITHOUT contacting a charged body is charged by: a) Induction b) Conduction c) Convection d) Insulation Ans: An electroscope char

Dc link scherbius drive - motor control , DC Link Scherbius Drive This ...

DC Link Scherbius Drive This type of scheme is shown in figure. This circuit  allows both  sub synchronous  and super synchronous speed control. In case  of sub synchronous spe

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