73122 - Electric Drives (2nd cycle)

Academic Year 2018/2019

  • Docente: Angelo Tani
  • Credits: 6
  • SSD: ING-IND/32
  • Language: Italian
  • Teaching Mode: Traditional lectures
  • Campus: Forli
  • Corso: Second cycle degree programme (LM) in Mechanical Engineering (cod. 8771)

    Also valid for Second cycle degree programme (LM) in Mechanical Engineering (cod. 8771)

Learning outcomes

The student acquires the knowledge of the main types of electric drives used in industrial automation. In particular, the dynamic models of electric machines, useful to implement torque and speed control schemes, will be developed. The student will be able to select, size, and simulate the electric drive more suitable for the specific application.

Course contents

Prerequisites

Basic skills in electrical engineering, electromechanical energy conversion and power electronics.

Course contents

DC motor drives

Characteristics of the DC motors. Speed control by field and armature winding regulation. Constant torque and constant power operations. Feed drives and spindle drives. Dynamic model of the DC motors. Control principles for torque and speed. Control schemes for torque and speed. Analysis and tuning of the regulators. Applications.

AC brushless drives

Introduction to synchronous motors. Surface mounted permanent magnet motors. Synchronous motor starting. Speed control by power converters. Multi-motor drives. Dynamic model of synchronous motors. Operating principle of AC brushless motors. Field-oriented control. Control schemes for torque and speed. Analysis and tuning of the regulators. Analysis of torque and speed performance limits. Applications.

Induction motor drives

Introduction to induction motors. Speed control by power converters. Open-loop control schemes. Constant V/F control. Acceleration ramps. Closed-loop control schemes. Slip control. Constant torque and constant power operating range. Dynamic model of induction motors. Field-oriented control. Control schemes for torque and speed. Rotor flux estimation. Analysis of torque and speed performance limits. Analysis and tuning of the regulators. Applications.

The lessons are supported by exercises with Personal Computer.

Readings/Bibliography

It is not necessary to buy specific books. The pdf files of the slides utilized during the lessons are indispensable and sufficient for the preparation for the exam, and are available on INTERNET. For further considerations:

  1. A.E. Fitzgerald, C. Kingsley JR, A. Kusko: “Macchine Elettriche”, Franco Angeli Editore, Milano, 1978.
  2. J.M.D. Murphy, F.G. Turnbull: “Power Electronic Control of AC Motors”, Pergamon Press, Oxford, 1988.
  3. I, Boldea, S.A. Nasar: “Electric Drives”, CRC Press, New York.
  4. P. Vas: “Vector Control of AC Machines”, Oxford University Press, New York.
  5. T.J.E. Miller: “Brushless Permanent-Magnet and Reluctance Motor Drives”, Clarendon Press, Oxford, 1989.
  6. T.J.E. Miller: “Switched Reluctance Motors and their Control”, Clarendon Press, Oxford, 1993.
  7. T. Kenjo: “Stepping Motors and their Microprocessor Controls”, Clarendon Press, Oxford, 1985.
  8. W. Leonard: “Control of Electrical Drives”, Springer-Verlag, Berlin, 2001.

Teaching methods

The frontal lessons are supported by exercises with Personal Computer (MATLAB-Simulink) carried out in the classroom.

Assessment methods

The exam consists of an oral examination, which is based on three questions.

Teaching tools

Lessons are carried out with the help of a personal computer and a computer projector (Power Point). The pdf files of the slides utilized during the lessons are available. Exercises are carried out in the classroom with the help of a personal computer and a computer projector (MATLAB-Simulink).

Office hours

See the website of Angelo Tani