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 a can be varied over the full range from 0 to p 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-? axes, with torque T on the y-axis [in N-m] and speed ? 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 (@a = 0 and a = p) rather than the rated machine voltage. What are the torque, speed, machine shaft power, and phase control angle a at the four corners of the operating envelope?

Related Discussions:- Drive operating envelopes and induction machines

What is pipelined architecture, What is pipelined architecture? The com...

What is pipelined architecture? The computer is composed of two parts that operate asynchronously one part known as a BIU, fetches instruction from code memory while the memory

Determine the cost of energy used in a system, The energy consumption for a...

The energy consumption for a small factory is given at the end of the brief. a) Three commercial tariffs from an energy supplier are shown below. Using these (or other commercia

Effect of feedback on dynamic response and bandwidth, Q. Effect of feedback...

Q. Effect of feedback on dynamic response and bandwidth? Let us consider the block-diagram representation of the open-loop system shown in Figure 16.2.5(a), whose direct transf

Advantages and disadvantages of rc coupled amplifier, Q. Advantages and Dis...

Q. Advantages and Disadvantages of rc coupled amplifier? Advantages 1. Aids excellent frequency response.The gain is constant over the audio frequency range 2. It has l

Calculate the current flowing through the inductor, The circuit is altered ...

The circuit is altered by replacing the capacitor, C1 with an inductor of 150mH and left with the switch in position (a) for a long time. At time t=0, the switch is moved from posi

Static v- i characteristics, Static V- I Characteristics The  static V-...

Static V- I Characteristics The  static V- I  characteristics of power diodes is shown  in figure 1.2  when the  anode is made  positive with  respect to cathode the power  dio

Magnetic circuits, Suppose we have a coil wound onto a ring of material wit...

Suppose we have a coil wound onto a ring of material with relative permeability µ r . Provided that the relative permeability µ r  >> 1, then the magnetic flux lines will s

Discuss properties and uses of glass and glass products, Discuss important ...

Discuss important properties and uses of Glass and glass products. Glass and glass products - Glass is an inorganic material build by the fusion of various metallic oxides. The

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