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Control System Assignment | DC Motor Speed Regulation

Added on - 28 May 2020

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CONTROL SYSTEM
Table of Contents1.DC motor speed regulation.......................................................................................................22.Input –output voltage relationship of an inverting amplifier....................................................33.Step response.............................................................................................................................54.Investigation of overall system dynamics.................................................................................75.Control scheme designed........................................................................................................111
Stage -21.DC motor speed regulationBy varying the applied armature voltage the speed regulation is controlled. A variablespeed DC drive is designed to supply a required DC voltage to the armature DC drive speedvariation. The field supply is maintained constant as it is voltage controlled.Cascade control structure with closed loop method is used. To achieve the fast rejection ofdisturbance which propagates to other parts of the loop cascade control should be completed.From the innermost current loop which proceeds to the slowest outer speed loop startedfrom the design loop. Dependence on the inner loop the outer loop is performed. The inner loopdynamics is modified as the impact on the outer loop and its performance can be reduced.System dynamicsIn the closed loop system the accuracy and dynamic response are better. The acceleration andthe deceleration of the motor can be controlled by the closed loop system. The output iscompared with reference voltage according to the requirement.There are two closed path in the control scheme. One is inner current loop and the other isouter speed control loop. Both loop are controlled with the controller according to therequirements of the system.When the motor is accelerated the armature current tends to increase the large value. Bylimiting the maximum current command voltage a current limit is obtained in this system.An error signal is produced when the gate pulse generator to the advance the firing pulses andincrease in the output voltage when the motor speed drops below the set point. Then itrandomly increases to the desired level.Constant torqueThe Torque speed of DC motor characteristics should match with the load to where the driveis to be connected. In the bottom base speed the armature voltage controlled is applied. Speedis Increased when the armature voltage is increased.To increase the speed above the base speed the field flux is used. The field flux is reducedwhen the armature voltage is kept constant at its rated voltage.2
In the armature circuit no extra power losses takes place. To control the base speed armaturevoltage control method is assumed, across the armature voltage very small speed should notbe given which is higher than the rated voltage.2.Input –output voltage relationship of an inverting amplifierInverting AmplifierThe Inverting amplifier is using to output will execute in exactly 180out of phase respectto the input. If apply the positive voltage the output will be opposite in input (that is negative).The output is inverted in op-am (that is the output term of phase) to input.VoutV¿Rf+V¿V¿R¿¿¿= ISumming amplifierThe summing amplifier is defined as the kind of inverting amplifier using operationalamplifier. The operational amplifier circuit configuration is combine present voltage on two ormore inputs into single output voltage (Ramroth, Gonder and Brooker, 2012)Multiple input resister and voltageSumming amplifier using inverting amplifierThe inverting operational amplifier has only one input voltage (Vin). The input voltage isapplied to the inverting input terminal. If added the more input resister using to the op-am input,3
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