Introduction to Electric Machines and Drives

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Course Overview

In the last 30 years, the introduction of power electronic drives with motors has led to new design opportunities. The increased integration of these drives and machines has triggered a quantum leap in productivity, efficiency and system performance.

This practical, hands-on course will give you a solid introduction to this rapidly expanding field under the guidance of industry experts.

Who Should Attend?

This course will benefit those new to the field of electrical rotating machines and drives and those desiring a refresher from the perspective of actual designs from practitioners. People who will find this course valuable include those working in the fields of:

  • Appliance drives
  • Cranes and elevators
  • Precision motion control
  • Renewable/alternative energy
  • Electric/hybrid-electric vehicles Autonomous vehicle control
  • Aerospace, marine, and military vehicles

Additional Information

Network With Your Peers!
As an added benefit, you will have the opportunity to attend a networking social hour after class on the first day, where you can discuss your interests with course faculty and attendees.

Course Outline

Introduction

Review: AC Systems and Three-Phase Circuits

  • AC voltages and currents
  • Effective or RMS values
  • Complex numbers and phasor concepts
  • Why three-phase?
  • Harmonics
  • Per-unit system

Review: Electromagnetics and Energy Conversion

  • Magnetic fields, flux, and force
  • Faraday’s Law of Induction
  • Ferromagnetic materials
  • Inductors and transformers
  • The DC machine

Basics of AC Machines

  • Elementary AC machines: air-gap MMF, flux, voltage waveforms
  • Distributed stator windings
  • Elementary rotor-stator coupling
  • Three-phase operation

Induction Motors: Steady State

  • Induction machine types: wound rotor, “squirrel cage” rotor
  • Circuit models
  • Concept of slip
  • Torque-speed curves

Synchronous Machines: Steady State

  • Synchronous machine types: wound rotor, permanent magnet
  • Circuit models and vector diagrams
  • Capability curves

Converter Power Electronics: Basic Theory, Devices

  • Review of circuit fundamentals
  • Basic converters
  • Conversion stages
  • Device characteristics and capabilities

AC Inverter Basics: VSI, CSI, Modulation

  • Basic inverter system
  • Voltage source inverter (VSI)
  • Current source inverter (CSI)
  • Modulation techniques
  • Pulse width modulation (PWM)
  • Practical considerations

Adjustable Speed Drives: Basics

  • Basic adjustable speed drive systems
  • Review: DC machine speed control
  • Varying voltage
  • Varying frequency
  • Motor and drive selection

Adjustable Speed Drives: Volts/Hz Control

  • Concepts of constant flux and torque
  • Operation at constant torque or power
  • Low speed operation
  • Basic Volts-per-Hertz system
  • Drive limitations

Adjustable Torque Drives: Basics

  • Ideal adjustable torque systems
  • Review: DC machine torque control
  • Key elements of torque control
  • Synchronous machine torque
  • Induction machine torque-slip control

Induction Motor Field Orientation

  • Review machine forces: Lorentz and reluctance
  • Rotating vectors: stator and rotor currents
  • Lorentz force control = vector control
  • AC current regulation
  • IM slip and torque production

Application-Specific Selection of Machine-and-Drive Systems

  • Load types and characteristics
  • Specific drives to suit application
  • Practical issues of machine and drive selection
  • PM versus IM
  • Installation considerations

Application of Wide Bandgap Devices to Power Electronics

  • Review of Silicon Carbide (SiC) and Gallium Nitride (GaN) devices
  • DC-DC converter example using SiC
  • 2-level VSI using SiC and GaN inverters

High-Speed Electric Machines

  • Review of high speed electric machines
  • Sizing equation and definition of tip speed
  • Pros and cons of each machine for high speed
  • High-speed machine design considerations

Instructors

Michael Harke

Michael received his BS, MS and Ph.D. in Mechanical Engineering from the University of Wisconsin – Madison in 1997, 1999 and 2006, respectively. His research focused on control theory, electric machines and power electronics. During his studies, he worked with numerous companies including Whirlpool, Ford Motor Company, Schneider Electric, International Rectifier and Hamilton Sundstrand.

In 2006, Michael joined Hamilton Sundstrand in the Applied Research Department where he worked on motor control and power electronics for aerospace applications including motor drives and actuators. Between 2010 and 2013 he was with Danfoss Power Electronics where he focused on industrial motor control. He has since returned to Hamilton Sundstrand, now known as UTC Aerospace Systems. He is also an Adjunct Professor at the University of Rome La Sapienza, teaching coursework on dynamic analysis and control of ac machines.

Michael is a member of the Institute of Electrical and Electronic Engineers where he serves as the Past Chair of the Industrial Drives Committee and society representative to the Sensors Council AdCom for the Industry Applications Society. He was the Technical Program co-Chair for the IEEE Energy Conversion Congress and Exposition 2013. He has published 25 papers in conferences and journals and has 8 patents.


Thomas Jahns

Thomas M. Jahns is a Professor with the Department of Electrical and Computer Engineering at the University of Wisconsin–Madison. Previously with GE Corporate R&D and Massachusetts Institute of Technology, Jahns has research interests in electric machines, drive system analysis and control, and power electronic modules.

Phil Kollmeyer

Phillip Kollmeyer received the B.S., M.S., and PhD degrees in Electrical Engineering from the University of Wisconsin-Madison, in 2006, 2011, and 2015 respectively, with a focus on electric machines, power electronics, and controls.

As a graduate student his research focused on electric vehicle drivetrain and energy storage system design, modeling, and fabrication. For his main project, which was the focus of his dissertation, he partnered with a company to convert a Ford F150 truck to a state of the art research vehicle. The electric truck was used to investigate various aspects of electric vehicle design, including the segregation of losses among drivetrain components, single versus multi-gear drivetrain, and battery / ultracapacitor hybrid energy storage systems. His interests are all things electric vehicle related, and he plans to continue working in this field as a consultant and in other roles.

Michael Ryan

Michael Ryan received his B.S. in Electrical Engineering from the University of Connecticut, Storrs,1988, M.E. degree in Electrical Engineering from Rensselaer Polytechnic Institute, Troy, NY, 1992, and Ph.D. in Electrical Engineering from the University of Wisconsin-Madison, 1997. At UW-Madison, Ryan worked in the WEMPEC labs on projects including dc–dc converters, variable-speed generation systems, and UPS inverter control.

Ryan is President of Ryan Consulting, involved in the application of Power Electronics and Controls, particularly for Alternative Energy systems. He has held prior positions at Capstone Turbine, General Electric Corporate Research and Development and Defense Systems divisions, Automated Dynamics, Otis Elevator, and Hamilton Standard.

Bulent Sarlioglu

Bulent Sarlioglu is an associate professor at the University of Wisconsin–Madison and the associate director of the Wisconsin Electric Machines and Power Electronics Consortium (WEMPEC). He previously worked at Honeywell International Inc.'s aerospace division for 11 years, most recently as a staff systems engineer, earning Honeywell's technical achievement award in 2003 and an outstanding engineer award in 2011. Bulent’s expertise includes electrical machines, drives, and power electronics and he is the inventor or co-inventor of 15 US patents as well as many international patents. He received his PhD from University of Wisconsin–Madison, MS from University of Missouri–Columbia, and BS from Istanbul Technical University, all in electrical engineering.

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Bulent Sarlioglu

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