Studies in Electrical and Electronic Engineering

1. Mathematical Models of Electrical Motors. Introduction. Voltage and flux-current equations. Space vectors and their representation in coordinate systems. Voltage and flux-current equations written in terms of space vectors. Transformation of vector equations into common rotating coordinate systems. Referring rotor quantities to the stator circuit. Instantaneous power and electromagnetic torque. Mechanical motion equation. Complete set of equilibrium equations. Park's transformation. Relationship between equations based on complex space vectors and the unified theory of electrical machines. Linearization of equilibrium equations. State equations and transfer functions. Per unit system. 2. Three-Phase Induction Motor. Design and basic types. Vector equilibrium equations in per unit system. Block diagrams. State equations. Properties of induction motors in steady states. Speed control by changing the supply frequency. 3. Three-Phase ac Synchronous Motors. Designs and major types. Equilibrium equations in per unit system. Block diagrams. Properties of synchronous motors in steady states. Speed control. 4. Separately Excited dc Motors. Design and major parameters. Equilibrium equations and equivalent circuits. Block diagrams and operator transfer functions. Steady-state characteristics. Speed control methods. 5. Power Converters for Motor Control. Line-commutated rectifiers and inverters. Frequency changes. Current-sourced inverters. Voltage-sourced inverters. Voltage-sourced dc-to-dc converters. Minimization of the losses of high-frequency power electronic switches. 6. Principles of Control System Synthesis. Dynamic optimization of continuous-time closed-loop systems. Digital control systems. Adaptive control systems. 7. Control Systems for DC Motor Drives. Dynamic properties of speed control systems. Dc drive with line-commutated converter. Dc drive with dc-to-dc converter. Digital analogue speed control systems. Adaptive speed control system. 8. Control Systems for the Wound Rotor Induction Motors. Speed control by: supply voltage variation; varying rotor circuit resistance. Double-fed induction motor. 9. Frequency-Controlled Induction Motor Drive Systems. Conditions of static optimization of control. Induction motor operation with non-sinusoidal supply wave-forms. Dynamic behaviour of frequency converter-fed induction motor under different modes of control. CSI-fed drive systems. Current-controlled PWM inverter-fed drive systems. VSI-fed induction motor drives. 10. Frequency-Controlled Synchronous Motor Drive Systems. Optimization conditions under steady states. Open-loop and self-controlled operation. Cycloconverter-fed drive systems. Load-commutated CSI-fed drive systems. Transistor PWM inverter-fed PM synchronous motor drive systems. Voltage/frequency control of VSI-fed multiple motor drives. 11. Introduction to Microprocessor Control. Appendices. References. Symbols employed. Index.