Modeling and Advanced Control of PM machines (3 credits)

Course Description

This is a graduate course intended to provide the student a fairly deep understanding of Permanent Magnet based electromechanical systems and their control techniques. After completing the course, the student is expected to be able to analyse and develop mathematical models of PM machines, evaluate motor performance and design drive control techniques.

Prerequisites

• Electric Machine Analysis and Control (EE5240)

Topics

• Basic Magnetostatics and Permanent Magnet Characteristics

  • Review of magnetostatics - Magnetic effects inside materials - H and M fields - Ferromagnetism - Permanent Magnets - Magnet B-H characterstics - Magnetic circuit analysis with Permanent Magnets - Halbach arrays

• PMSM modeling and Control

  • Types of PMSM - Airgap modeling - Stator winding inductances - Model in the stationary frame - Transformation to rotating reference frame - Space phasor model - Normalised model equations - Vector control of PMSM - Control Philosphies: MTPA control, UPF control - Flux weakening operation - Comparison between IPM and SMPM machines - Sensorless control: Back-emf based methods - Closed loop observers - High-frequency injection techniques: Rotating carrier and oscillating carrier methods – Cogging torque in PM machines

• PM BLDC motors: Modeling and Control

  • Constructional features - Modeling the machine - Trapezoidal control with Hall Sensors - Commutation torque ripple - Phase advancing - Half-wave PMBDCM drives - Motor Design Considerations - Sensorless control methods

• Special related topics

  • Axial flux PM machines - PM assisted reluctance machines - FSCW machines - Cogging torques and smoothing techniques - Parameter sensitivity and estimation techniques for PM machines

Textbooks

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

• Miller, T. J. E., and J. R. Hendershot. Design of Brushless Permanent-Magnet Machines, Motor Design Books LLC, 2010.

• Sul, Seung-Ki. Control of Electric Machine Drive Systems, Wiley-IEEE Press, 2011.

Grading

• Quiz-1: 20%

• Assignments: 40%

• Final exam: 40%