Course Details

Subject {L-T-P / C} : EE6444 : SPECIAL ELECTRICAL MACHINES {3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Venkata Ramana Naik N.

Syllabus

Review of adjustable speed drives, motor requirement for drives, induction motor and synchronous motor drives Vector control and Field Oriented Control methods. Permanent- magnet materials, characteristics, energy density, and equivalent circuits, losses, and efficiency of permanent magnet motors. Principle and construction of permanent magnet brushless direct current motor (PMBLDCM) drives operation with sinusoidal, square and trapezoidal waves, and vector control of PM synchronous motor Control strategies Flux weakening operation. Modeling of the drive Converter topologies for a PMBDCM drive. Sensor-less control of AC drives, parameter identification in PMBLDCM and induction motor drive, speed and position estimation, parameter sensitivity Robust motion control. Principle and construction of synchronous reluctance based drive, operating condition and power factor of synchronous reluctance motors, constant power operation, permanent magnet reluctance motors. The principle, construction, and operation of switched reluctance motors, the torque developed, losses and efficiency Design and application considerations. The principle, construction and operation of linear induction motors, Goodness factor, short stator and short rotor effect High speed and low-speed applications. The principle, construction and operation of stepper motors, variable reluctance and permanent magnet stepping motors, hybrid stepping motors, driver circuits. Energy-efficient motors.

Course Objectives

  1. Review of adjustable speed drives, motor requirement for drives, induction motor and synchronous motor drives Vector control and Field Oriented Control methods. Permanent- magnet materials, characteristics, energy density and equivalent circuits, losses, and efficiency of PM motors. Principle and construction of permanent magnet brushless dc motor drives (PMBDCM) Operation with sinusoidal, square and trapezoidal waves Vector control of PM synchronous motor Control strategies Flux weakening operation Modeling of the drive Converter topologies for a PMBDCM drive. Sensor-less control of AC drives, parameter identification in PMBDCM and induction motor drive, speed and position estimation, parameter sensitivity Robust motion control.
  2. Principle and construction of synchronous reluctance based drive, operating condition and power factor of synchronous reluctance motors, constant power operation, PM reluctance motors. The principle, construction and operation of switched reluctance motors, torque developed, losses and efficiency Design and application considerations.
  3. The principle, construction and operation of linear induction motors, Goodness factor, short stator and short rotor effect High speed and low-speed applications.
  4. The principle, construction and operation of stepper motors, variable reluctance and permanent magnet stepping motors, hybrid stepping motors, drive circuits. Energy efficient motors

Course Outcomes

1. Model and develop the speed control techniques using power electronic switching devices of special motor drives in industrial applications such as permanent magnet brushless motor drive, switched reluctance motor, linear induction motors, stepper motors, induction motor and synchronous motor.
2. Analyse the steady state and dynamic behavior of the above-mentioned drives.

Essential Reading

  1. Murphy J.M.D., Turnbull F.G.,, Power Electronics Control of AC Motors, Pergamon Press , New York,1988
  2. Bose B.K.,, Power Electronics & Variable Frequency Drives –Technology & Applications, IEEE Press, Standard Publisher Distribution , 2001

Supplementary Reading

  1. Miller T.J.E.,, Brushless Permanent Magnet and Reluctance Motor Drives, Oxford Clarender Press , 1982
  2. Nasar S.A, Linear Motion Electric Machines, Wiley , 1976