Syllabus

Syllabus:
Module1: Stepper Motor - Construction and principle of operation, Types- variable reluctance and permanent magnet stepper motors, hybrid stepper motors and Excitation schemes. (4 Hrs)

Module2: Permanent Magnet DC Motor (PMDC) - Fundamentals of permanent magnets, Permanent-magnet materials, characteristics, energy density, Construction and Operating principle, Speed-torque characteristics. (4 Hrs)

Module3: PMBLDC - Construction, Electronic commutation, Principle of operation, BLDC Square wave motor, Comparison of conventional and brushless DC motor, Detection of rotor position and the use of Hall elements, Dynamic characteristics. (4 Hrs)

Module4: Permanent Magnet Synchronous Motor (PMSM) – Construction, Principle of operation, Emf equation, Torque equation, Phasor diagram, Dynamic model, Control Strategies- Principle of vector control, Torque-controlled drive system, Current-controlled drive system. (8 Hrs)

Module5: Single phase AC commutator motors – AC series motors, Un-compensated AC series motor - Phasor diagram, KVL equations, performance parameters, characteristic curves, Compensated AC series motor - Phasor diagram, KVL equations, performance parameters, characteristic curves. (5 Hrs)

Module6: Small motors – Hysteresis motors, Repulsion motor, Servomotors, Reluctance motor. (8 Hrs)

Module7: Linear motors-working principles, principle of levitation, applications. (5 Hrs)

To understand the operating principle of stepper motor, PM motors, small motors, etc.

To understand the selection criterion of motors for different applications.

To understand the speed control concepts of different motors along with appropriate driving circuits.

Course Outcome:
After successful completion of the course the students will be able to:

CO1: Explain the operating principle of different special motors.

CO2: Estimate the electromagnetic force and torque developed in a magnetic field to explain basic principle of electric motors.

CO3: Develop the dynamic model of different types of special motors.

CO4: Predict correctly the expected performance and demonstrate an understanding of the fundamental control practices.

CO5: Analyse various types of speed control techniques in both open-loop and closed-loop speed control.

CO6: Evaluate various control techniques to further improve the current or flux ripple performance of the motor drives.

R. Krishnan, Permanent Magnet Synchronous and Brushless DC Motor Drives, CRC Press, New York , 2010

T. Kenjo and S. Nagamori, Permanent-Magnet and Brushless DC Motors, Clarendon Press, Oxford , 1985

Miller T.J.E.,, Brushless Permanent Magnet and Reluctance Motor Drives, Oxford Clarendon Press , 1989

E. G. Janardanan, Special Electrical Machines, PHI Learning Pvt. Ltd. , 2020