Dc machine dynamic performance, Electrical Engineering

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.

Posted Date: 3/14/2013 3:55:07 AM | Location : United States

Related Discussions:- Dc machine dynamic performance, Assignment Help, Ask Question on Dc machine dynamic performance, Get Answer, Expert's Help, Dc machine dynamic performance Discussions

Write discussion on Dc machine dynamic performance
Your posts are moderated
Related Questions
In this design, there are 24 line finders. If any of the 100 subscribers has to get access to any of 24 two-motion selectors, it is necessary that every line finder is capable of r

What are the Disadvantages of using robots -  They can find it difficult to deal with 'unusual' circumstances for example a door is missing from a car waiting on the paint spra

dear sir, when i am going to simulate my model in matlab i am getting the following error : the derived input for the integrator is inf or nan at time xxxxx. try to reduce the step

Q. WEIGHTED-RESISTOR CONVERTER? Figure shows a 4-bit weighted-resistor D/A converter which includes a reference voltage source, a set of four electronically controlled switches

Q. Show output Characteristic Of Common Emitter Configuration? Output characteristics: This family of curves may be divided into three regions just as was done for common base

Q. Mention The Three Transistor Configurations? The three transistor configurations are 1)Common emitter configuration 2)Common base configuration 3)Common collector c

Determine the total active power: Circuit is introduced in the Face 1. It is about a single-wires face for a three-phase system. The voltage of the AC source is of 69kV. The s

defination and working ?

Three equal impedances of D ohms resistance and C inductive reactance are connected in a DELTA configuration. The line voltage is A00 volts. Determine the line current, phase cur