Syllabus - Special Machine (EX-802 (B))

Stepper Motors

Discretisation of angular position by stepper structures, stepping angle and frequency of excitation. VR and PM rotor structures and their torque production, torque angle characteristics. The hybrid structure and torque production by permanent magnet and excitation fluxes. Power electronic converters for stepper motors, control by load angle.

Switched reluctance motor

Static torque production, partition of energy and the effects of saturation. Dynamic torque production, torque speed characteristics, shaft position sensing, solid rotors.

BrushLess DC Motor

Construction and principle, speed control, basic concept of torque, outer and inner rotor, magnetic circuit concept, electrical analogy, winding pattern series and parallel, Thermal consideration.

Permanent magnet materials and circuits

Characteristics, parameters, properties, classification and calculations. Permanent magnet motors, D.C. brushed motors, design analysis and control and applications.

PM synchronous motors

Rotor construction, theory, operation, control and applications. PM step motors, hybrid step motors, sensorless control, reduction of torque pulsations. Case studies such electric vehicles, industrial drives, PV fed water pumping.