D.C. Motor Library

 
D.C. Motor Library

➣ Introduction

➣ Principle of Operation of a D.C. Motor

➣ Direction of Rotation of Motor

          Fleming's Left Hand Rule

➣ Significance of Back E.M.F.

          Voltage Equation of a D.c. Motor

          Back E.M.F. as a Regulating Mechanism

➣Power equation of a D.C. Motor

          Condition for Maximum Power

➣ Torque Equation of a D.c. Motor

          Types of Torque in the Motor

          No Load Condition of a Motor

➣ Types of D.C. Motors

➣ D.C. Shunt Motor

          Voltage and Current Relationship

➣ D.C. Series Motor

          Voltage and Current Relationship

          Comparison between Shunt and Series Field Winding

➣ D.C. Compound Motor

          Long Shunt Compound Motor

          Short Shunt Compound Motor

➣ Torque and Speed Equations

          Speed Regulation

➣ D.C. Motor Characteristics

➣ Characteristics of D.C. Shunt Motor

➣ Characteristics of D.C. Series Motor

➣ Why Series Motor is Never Started on No Load ?

➣ Characteristics of D.C. Compound Motor

➣ Applications of D.C. Motors

➣ Effect of the Armature Reaction Performance of a D.C. Motor 
➣ Factors Affecting the speed of a D.C. Motor
➣ Ratings of a D.C. Motor

➣ Speed Control of D.C. Shunt Motor

          Flux Control

                    Advantages of Flux Control Method

                    Disadvantages of Flux Control Method

          Armature Voltage Control Method or Rheostatic Control

                    Potential Divider Control

                    Advantages of Rheostatic Control

                    Disadvantages of Rheostatic Control

          Applied Voltage Control

                     Advantages of Applied Voltage Control

                     Disadvantages of Applied Voltage Control

➣ Speed Control of D.C. Series Motor

          Flux Control

                     Field Divertor Method

                     Armature Divertor

                     Taped Field Method

                      Series-parallel Connection of Field

          Rheostatic Control

          Applied Control
➣ Ward-Leonard System of Speed Control

➣ Necessity of Starter for D.C. Motors

➣ Three Point Starter

          Functions of No Volt Coil

          Action of Overload Release

          Disadvantages

➣ Four Point Starter

          Disadvantages

➣ Losses in a D.C. Machine 

         Copper Losses

         Iron or Core Losses

         Mechanical Losses

         Power Flow in D.C. Machine

➣ Efficiency of a D.C. Machine

          Condition for Maximum Efficiency

          Current at Maximum Efficiency
➣ Electric Braking of D.C. Motors
          Electric Braking of D.C. Shunt Motor
          Electric Braking of D.C. Series Motor

➣ Brushless D.C. Motor
          Unipolar Brushless D.C. Motor
          Bipolar Brushless D.C. Motor
          Features of Brushless D.C. Motor
          Applications of Brushless D.C. Motor

➣ Parameters Magnets D.C. Motors
         Construction
         Working and Performance Characteristics
         Performance Characteristics
         Advantages
         Disadvantages
         Applications

➣ Testing of D.C. Motors
         Direct Method of Testing
         Indirect Method of Testing

➣ Swinburn's Test or No Load Test
         Advantages
         Disadvantages

➣ Brake Test
         Advantages
         Disadvantages

➣ Retardation Test or Running Down Test
         Determination of dN/dt
         Determination of Moment of Inertia (I)
➣ Hopkinson's Test
         Advantages
         Disadvantages
➣ Field Test