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This intensive course covers how modern motors & variable speed drives operate & introduces & outlines alternative options that are available to industrial, commercial & building facility owners & specialists. NEMA motor performance specifications for...

Course Outline
Alternating current induction motors powered by adjustable speed drives (ASDs) allow high energy efficiencies in driving pumps, fans, compressors, and other types of mechanical loads. 
Additional attractive advantages of ASDs include improved control, as well as enhanced startup and performance characteristics. This intensive course covers how modern motors and variable speed drives operate and introduces and outlines alternative options that are available to industrial, commercial and building facility owners and specialists. NEMA motor performance specifications for motor operation with ASDs are the focus of the first part of the course. The course also presents guidance and requirements that must be followed for safe and successful application. Maintenance considerations, issues and practices are discussed in detail. The presentation explains and motivates using Pulse Width Modulated (PWM) inverters that have gained wide acceptance in powering AC induction motors to quickly replace DC drives due to their simplicity, economy, accuracy, and lower maintenance requirements. The basic principles involved in PWM inverters are covered, while focusing on guidelines and requirements that must be followed for a successful application. There will also be a section on how to select from the many options that you will see in the literature, what they will do (or not do), and why you might want them. A section on common problems associated with applications, and troubleshooting will also be very helpful for anyone who must diagnose or fix any of the problems that might arise in industrial, building and commercial facilities.

Objectives To offer an all-inclusive discussion of the principles of operation, selection, protection of alternating current motors, and variable speed drives. Participants will be able to specify, select, and commission the proper motors, and variable speed drives for their applications. The object is to achieve reduced capital, operating and maintenance costs along with increase in efficiency, product quality, and reliability.

Who Should Attend The course is a must to facilities specialists who are involved in selecting, operating, and maintaining motors and adjustable speed drives. Some familiarity with electrical principles is an asset.
Program Outline (1.8 CEUs / 18 PDHs)
Day 1

Principles of Induction Motors Operation
  • Rotating Magnetic Fields
  • Motor construction Features
  • Motor Operation: power and torque speed characteristics
  • Effects of variations in voltage, frequency and unbalanced sources on operational characteristics
  • Motor design classes
  • Motor insulation classes

Induction Motor Starting and Speed Control

  • Motor starting circuits and technologies
  • Speed control by changing synchronous speed: pole changing, line frequency changing
  • Changing Slip: line voltage control, rotor resistance control, rotor slip energy recovery
  • Introduction to Variable or Adjustable Drives

Motor Failure Modes and Diagnostic Testing

  • Typical motor failure modes
  • Bearings and lubrication
  • Predictive maintenance and diagnostic testing

Day 2

Operation and Protection of Motors

  • Motor Degrees of protection IP
  • Induction motor protection
  • Motor selection
  • Special Classifications of motors
  • Testing
  • Capacitor selection and application considerations

Fundamentals of AC Pulse Width Modulated (PWM) Drives

  • Principles of AC voltage generation (variable voltage, volts per hertz, etc.)
  • Basic Inverter types (constant voltage or constant current)
  • PWM inverter principles (sine wave modulation, devices for Pulse Width Modulation)

Transients, Harmonics, and Power Factor Considerations

  • AC line transients and protection (various transients, over voltage and fuse protection)
  • Impact of non-sinusoidal input on induction motors
  • AC harmonics (causes, action taken)
  • AC power factor (effects on variable speed drives, action taken)

Day 3

Operational Problems of Variable Speed Drives

  • Motor thermal derating (causes, requirements)
  • Insulated Gate Bipolar Transistor (IGBT) switching transients
  • PWM switching waveforms
  • Cable reflections, effects of cable length and IGBT switching speed, problems arising from these voltage transients, cable insulation stress, motor winding insulation stress
  • Mitigating switching transients, cable terminating impedance, inverter output filter, extra insulation in the motor and cable)

Applications and Selection Criteria of Variable Speed Drives

  • Applications of variable speed drives (pumps, fans, compressors, heat pumps, etc.)
  • Requirements of regeneration
  • Advantages of variable speed drives (reduction in energy cost)

Maintenance and Common Failure Modes of Variable Speed Drives

  • Testing, diagnostics, and common problems of variable speed drives
  • Common failure modes of variable speed drives
Instructor Dr. El-Hawary is a Professor of Electrical and Computer Engineering at Dalhousie University and was Associate Dean of Engineering between 1995 and 2007. His technical contributions cover more than forty years of sustained work in research, education and service to the community. On the research side, Dr. El-Hawary pioneered in computational solutions for economic operation of power systems including hydro-thermal systems. His fundamental  and pioneering work on economic operation of power systems, the application of computational intelligence techniques to power system operational problems is frequently referred to by the users community, and is documented in ten textbooks and research monographs and more than 300 research articles.
  He served as IEEE Canada President (2002-2003,) and Secretary of IEEE (2004-2005) and the Awards Board and Fellows Committee. Moreover, he served as IEEE Canada Awards Chair.
Dr. El-Hawary serves currently as a member of the 2010 Publications Services and Products Board, and is IEEE Press Power Engineering Series Editor. He served as Editor-in-Chief of IEEE Press in 2006-2007. He is Founding Editor, Power Letters, Power Engineering Society, is Associate Editor for the three major Electric Machines and Power Systems' Journals, and is Editor, Electrical Power Engineering, McGraw-Hill Encyclopedia of Science and Technology
  Dr. El-Hawary received numerous awards and recognitions including the McNaughton medal and is a Fellow of the Canadian Academy of Engineering, the Institute of Electrical and Electronics Engineers, and the Engineering Institute of Canada.
Prerequisites & Certificates

Certificates offered

Each participant will receive a complete set of course notes and handouts that will serve as informative references.

Cancellation Policy
If you wish to withdraw from a course, you must advise us, in writing, including the official receipt. Our policies regarding refund are:

More than fifteen business days in advance: a full refund minus $50.00 administration charge.

Fifteen or less business days in advance: a transfer to another course or a credit, valid for one year, to another GIC course can be considered. Credits are transferable within your organization.

If the course has been running for more than 2 weeks, or after the course has started, an 80% credit towards another GIC course may be considered, if notice is received before the start date of the second session. After this time, no refunds or credits will be issued. If a speaker is not available due to unforeseen circumstances, another speaker of equal ability will be substituted.

GIC reserves the right to cancel or change the date or location of its events. GIC's responsibility will, under no circumstances, exceed the amount of the fee collected. GIC is not responsible for the purchase of non-refundable travel arrangements or accommodations or the cancellation/change fees associated with cancelling them. Please call to confirm that the course is running before confirming travel arrangements and accommodations.

Refund Policy: Allow up to 30 days for refunds to be processed.

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