DC power systems are not very common in the contemporary
engineering practice. However, DC motors still have many practical applications,
such automobile, aircraft, and portable electronics, in speed control
applications. The topics in this lecture presentation are as follows : DC
motors, The simplest DC machine, Commutation in a simple 4-loop DC machine,
Problems with commutation in real DC machines, Solutions to the problems with
commutation, Power flow and losses in DC machines, The losses in DC machines,
The power-flow diagram, Equivalent circuit of a DC motor, Magnetization curve of
a DC machine, Motor types: Separately excited and Shunt DC motors, Shunt motor,
Motor types, Series motor, Cumulatively compounded motors: torque-speed
characteristic, Differentially compounded motors: torque-speed characteristic,
Compounded DC motor, DC motor starters.
This note covers the following topics: Elementary
Direct-Current Machine, Windings in Relative Motion, Voltage and Torque
Equations, Basic Types of Direct-Current Machines,Separate Winding Excitation,
Shunt-Connected DC Machine, Series-Connected DC Machine, Compound-Connected DC
Machine, Actuators and Sensors in Mechatronics, Brushed DC Motors,Time-Domain
Block Diagrams, State Equations, andTransfer Functions ,Elementary Approach to
Permanent-Magnet, DC Motor Modeling, Control of DC Motors, Geared Systems,
Optimum Gear Ratios, and Motor, Motor Selection Considerations.
This note explains the following topics: Electromechanical Energy
Conversion, Forces and torque in magnetic systems, DC Generators, types of DC
generators, voltage buildup, critical field resistance and critical speed, DC
Motors And Testing, Single Phase Transformers, Three Phase Transformers.