SECOND SEM:NOTES & STUDY MATERIALS

 Includes lecture notes of second Semester related subjects

• DC DRIVES

             Notes:-
           1. Dc Drive 1

Two Mark Questions :-

•  Factors considered for Motor Selection

                       Ambient temperature of Operation,type of duty cycle,Power requirement,Maximum torque,type of environment & so on

•  Requirements of Drive Characteristics

                           Motor drive should have Capability for dynamic operation,starting under high torque condition,braking capability,multi-quadrant operation including regenerative mode of operation. 

• • What is the purpose of Shaft position sensor in switched Reluctance Motor?

  • Effect of Current Ripple on performance of DC motor?

  • Effect of Source inductance in 3 phase fully controlled rectifier dc motor? 

  • Purpose of freewheeling diode in a semi converter controlled DC drive

  • Effect of discontinous current in DC motor drive performances

  • How is braking performed using fully controlled converters

  • Dynamic braking & Regenerative Braking

  • What is meant by Time Ratio Control of Choppers?

  • How choppers can be used to advantage in an overhauling DC drive System

  • What is O/P Voltage of Class B Chopper if the input voltage is 24V & duty cycle is .5?

  • How motor Speed depent on duty cycle in a chpper controlled DC motor Drive?

  • What is the use of PID Controller?

          The PID Controller is used to set up a reference signal based on the sum of the following terms:proportional to error,integral value of error & different value of error.The error signal may be the computation of the difference between the reference speed & actual speed of a DC motor Drive.The PID Controller may be the reference control signal that sets the duty cycle of chopper in a DC drive application

  • Difference b/w Open loop & Close loop spseed Control

  • Equivalent circuit of armature & Expression for air gap power.

  • Equation for electromechanical model for DC motor Drive

  • Advantages of Using microcontrollers for DC motor Control?

                Microcontrollers offer flexibility of changing the programs & Control methods of DC drives.Provide High reliability & repeatability in performance.

  • Purpose of Using Gate Driveers in Converters used for DC motors.

  • Various methods of sensing Current in DC motors

  • Difference b/w Low side drive 7 high side Drive in gating circuits

  • Disadvantages of microcontroller based Digital drive in comparison to an analog controller

  • Purpose of Commutator in DC Brush motor

  •  Different components of Load torque

  • Various Components of Load Torque

    
    

ESSAY Questions :-

• Various methods of speed detection in closed loop control of DC drives

• Phse locked speed control of DC drives with program & flowchart for constant power operation.

• microcomputer controlled of Dc drives with program & flow chart for load distributed operation

• various methods of gate firing circuits for choppers & phase controlled convertres

• constant torque 7 constant horse power operation of DC motor. Explain Various classes of mototr duty

• Ward -Leonard method of speed control.Advantages & Disadvantages.

• Circuit Diagram & wave forms for 3 phase dual converter,Discuss effect of armature.

• 3phase full converter fed separately excited dc motor for continuous armature current  & expression for performance parameter.

• Regenerative braking operation of Seperately excited DC motor

• Operation of 2 phase chopper with circuit & Waveforms.

• Class D Chopper controlled separately excited DC motor

• Transfer Function of self excited DC Motor

• Dynamic simulation of speed controlled DCmotor Drive

• Block diagram for closed loop control with field weakening using a chopper based Converter.

• Closed Loop control block diagram for a DC drive operated using controlled converter.

QUESTION PAPERS-PREVIOUS YEARS:-

       MAY/JUNE 2014  :-PAGE 1     PAGE 2    PAGE 3
       JUNE/JULY 2013  :-PAGE 1     PAGE 2    PAGE 3

• AC DRIVES 

  Notes:-

1. Ac Drive 1
2. Ac Drives 2

QUESTION PAPERS-PREVIOUS YEARS:-

       NOVEMBER/DECEMBER 2015  :-PAGE 1        PAGE 2

• FLEXIBLE AC TRANSMISSION

  
  

  
  
  

                                                       

  •  POWER QUALITY

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• ENERGY MANAGEMENT AND AUDITING