Introduction to all kinds of special machines, stepper motor, reluctance motors, hysteresis motors, brushless motors etc. Constructional features, Principle of operation, Variable reluctance motor, Hybrid motor, Single and multi-stack configurations, Torque equations, Modes of excitations, Characteristics, Drive circuits, Microprocessor control of stepping motors, Closed loop control.
Synchronous Reluctance Motors
Constructional features, Types, Axial and Radial flux motors, Operating principles, Variable Reluctance and Hybrid Motors, Voltage and Torque Equations, Phasor diagram, Characteristics.
Switched Reluctance Motors
Constructional features, Rotary and Linear SRMs, Principle of operation, Torque production, Steady state performance prediction, Analytical method, Power Converters and their controllers, Methods of Rotor position sensing, Sensor less operation, Closed loop control of SRM, Characteristics.
Permanent Magnet Synchronous Motors
Permanent Magnet materials, Magnetic Characteristics, Permeance coefficient, Recoil of a magnet, Principle of operation, Ideal PMSM, EMF and Torque equations, Armature reaction MMF.
Brushless D.C. Motors
Principle of Operation, Types, Magnetic circuit analysis, EMF and torque equations, Commutation, Power Controllers, Motor characteristics and control, Torque/speed characteristics,