Dc machine dynamic performance, Electrical Engineering

Assignment Help:

Calculate the following for a 2 hp and a 20 hp dc machine, each rated for 500 rpm. Use data from the Study Plan 1 data sheet, including "hot" armature resistance value for all calculations. Note that the value of K is proportional to the field flux, and the printed value is for rated (100%) flux. Both the load moment of inertia JL and the viscous friction coefficient B are zero unless stated otherwise.

a) Calculate the eigenvalues (real or complex) for operation at rated flux and at 50% of rated flux:

b) Calculate the dominant time constant τ of the 2 hp machine and the natural frequency ωN and damping factor ζ of the 20 hp machine (assume rated flux for both machines). Use them to determine the approximate percentage overshoot and settling time (within 2%) for the rotor speed's natural response for each machine following a step change in the armature voltage. Assume zero load inertia. Plot the transient response of the rotor speed ω (in rpm) for both machines for a step in the armature voltage from 50% to 100% rated voltage, assuming no steady-state load torque (i.e., TL=0) and an initial rotor speed corresponding to the no-load speed at 50% rated voltage. Calculate the initial and final speed values for both machines.

c) Find the value of an external series resistance for both machines that will limit the steady-state stall current (i.e., speed = 0) with rated voltage to 125% of rated current. With this resistor in the circuit, repeat the eigenvalue calculation of part a) for both machines. Assume rated field flux. Plot the migration of 20 hp machine's eigenvalues (i.e., root locus) as the additional series resistance Radd is increased from 0 to its final value.


Related Discussions:- Dc machine dynamic performance

CRO, what are the difference between digital and Analog storage oscilloscop...

what are the difference between digital and Analog storage oscilloscope ?

Copy data byte 10h ldax instruction, Copy  data byte  10H LDAX  instruct...

Copy  data byte  10H LDAX  instruction Example : Copy  data byte  10H  stored at memory  location 3020 H to  the accumulator using  LDAX  instructions. Solution : To use

Assigment, what is p-n junction and how its work

what is p-n junction and how its work

Return instructions , Return Instructions These instruction  are used ...

Return Instructions These instruction  are used to transfer the program sequence from subroutine to the  calling program. Basically  it restores the  previous  contents  of th

Binary subtraction , Binary Subtraction Negative numbers are represent...

Binary Subtraction Negative numbers are represented in 2 complement form and subtraction is also  per formed  using  2 complement  method in microprocessor. Hence we will  dis

Coherent psk system, To have the same value of P e , show that E b /N 0 in...

To have the same value of P e , show that E b /N 0 in a coherent-ASK system has to be twice that in a coherent PSK system.

Total debt to total assets ratio, Total Debt to Total Assets ratio A m...

Total Debt to Total Assets ratio A metric used to measure a company's financial risk by determining how much of the company's assets have been financed by debt. It is calculat

Explain daa instruction, Explain DAA instruction. DAA: The DAA instruct...

Explain DAA instruction. DAA: The DAA instruction follows the instruction ADC or ADD to adjust the result in a BCD result. The DAA instruction performs only with the AL registe

Power distribution, Power Distribution: - The Energy Conservation Act,...

Power Distribution: - The Energy Conservation Act, 2001, gives the legal framework, institutional arrangement and a regulatory mechanism at the Central and State level to emba

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