Drive operating envelopes and induction machines, Electrical Engineering

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?

Posted Date: 3/14/2013 4:02:53 AM | Location : United States







Related Discussions:- Drive operating envelopes and induction machines, Assignment Help, Ask Question on Drive operating envelopes and induction machines, Get Answer, Expert's Help, Drive operating envelopes and induction machines Discussions

Write discussion on Drive operating envelopes and induction machines
Your posts are moderated
Related Questions
The field winding of a 200 V d.c. machine has a resistance of 20? and an inductance of 500mH. Calculate: (a)  The time constant of the field winding (b)  The value of curr

Q. Write a brief note on common drain amplifier Since voltage at the gate-drain is more easily determined than that of the voltage at gate-source, the voltage source in the inp

Q. What is Time Switches? Principle of a time switch is displayed in Figure. It connects an incoming n channel PCM highway to an outgoing n channel PCM highway. As any incoming

Q. At the two terminals (A, B) of a one-port network, the voltage and the current are given to be v(t) =200 √2 cos (377t + 60°) V and i(t) = 10√2 cos(377t + 30°) A. (a) Determin

DI Disable  Interrupts Instruction The interrupt enable  flip flop is reset and all the  interrupts of 8085 microprocessors  except  TRAP  are disabled . the  instruction  form

Space communication - Application of Software Defined Radio Software defined radio can save cost of missions while constructing multiple mode, multiple band radio systems that

A single phase line has an impedance of 8.4 + j11.2 Ω. The line feeds a load consisting of a resistor and an inductor connected in parallel as shown in Figure 1. The load is absorb

Q. Classify Feedback control systems according to purpose of the system? • Position control systems. Here the output position, such as the shaft position on a motor, exactly fo

a shunt motor supplied at 230V rms runs at 900rev/min when the armature current is 30A.the resistance of the armature circuit is 0.4 ohms.find the armature input

Q. Motoring mode of rotating machines? The motoring mode has electric power input and mechanical power output. The electromagnetic torque Te drives the machine against the load