Variable Speed Drives Course


In the last two decades the applications of variable speed drives in industries are increased and getting wider. The trends are propelled by the advance on power electronics and the associated controllers. By using modern variable speed drives, industrial drives can be operated efficiently and automated easily.

The increasing number of variable speed drives in an industry has made the industry to prepare engineers and technicians that having a capability to select, operate, and maintain variable speed drives properly. This task is quite difficult because there are various variable speed drives offered by vendors and unfortunately, no standards exist on these products. To make it the problem getting worse, the very fast change of technology has made the products are changed continuously. To solve these, industry has to prepare engineers and technicians that having strong background on power electronics, electric motors, and microelectronics. With this basic knowledge, various products and technology can be handled easily.


This short course is intended to understand fully the principles, applications, and troubleshooting of variable speed drives.

Course Outline
  • Introduction to Variable Speed Drives
    • Why we need variable speed drives
    • What are variable speed drives
    • Introduction to power electronics
    • Introduction to variable speed electric ac drives
    • Introduction to modern variable speed electric drives
    • Applications of variable speed drives
  • AC-DC Converters (Rectifiers)
    • Diodes, transistors, and thyristors
    • Single-phase diode rectifiers
    • Single-phase thyristor rectifiers
    • Three-phase diode rectifiers
    • Three-phase thyristor rectifiers
    • Multipulse rectifiers
    • Current controlled rectifiers
    • Protection system
  • DC-AC Converters (Inverters)
    • Single-phase voltage-source inverters
    • Three-phase voltage-source inverters
    • Pulse width modulation technique
    • Current-controlled voltage-source inverters
    • Current-source inverters
    • Protection system
    • High-power inverters
  • AC motors
    • Induction motor characteristics
    • Control of induction motor
    • Synchronous motor characteristics
    • Control of synchronous motor
    • Switched reluctance drives
  • Variable Speed Drive System
    • Variable speed electric ac drives
    • Transformer for variable speed drive systems
    • Protection system of variable speed drives
    • Application considerations of variable speed drives (harmonic, power factor, and EMI problems)
  • Maintenance and Troubleshooting
    • Maintenance and troubleshooting of rectifiers
    • Maintenance and troubleshooting of inverters
    • Maintenance and troubleshooting of control boards
    • Maintenance and troubleshooting of auxiliary equipment
Laboratory Exercise
  • Regulations and Safety standards
Recommended Prerequisite

Knowledge in Electrical

What would you get?

Certificate, USB Flash-drive containing training material, Notebook, Documentation, Lunch and refreshment

Who should attend?

Senior Electrical technician and Engineers


4 Days

Course Agenda

Variable Speed Drives

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