AC Electric Motors & Drives Masterclass

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Venue Starting Date Duration Fees Join Now
Dubai - UAE , 20220307 07 - Mar - 2022 5 - Day $4,750 Register
Online - Virtual , 20220718 18 - Jul - 2022 2 Hrs X 8 Sessions $1,750 Register
Dubai - UAE , 20220905 05 - Sep - 2022 5 - Day $4,750 Register
Dubai - UAE , 20221219 19 - Dec - 2022 5 - Day $4,750 Register


It is estimated that electrical drives and other rotating equipment consume about 50% of the total electrical energy consumed. The variable frequency drive (VFD) industry is growing rapidly, and it is now more important than ever for technicians and maintenance personnel to keep VFD installations running smoothly

This outstanding seminar gives you a fundamental understanding of the installation, operation and troubleshooting of Variable Speed Drives (VSDs), electric motors & VFDs. Typical practical applications of VSDs in process control and materials handling such as those for submersible pumps, electric motors in mining and manufacturing and ventilations are covered in detail. You will learn the basic steps in specifying, installing, wiring and commissioning motors & VFD. The concluding section of the course gives you the fundamental tools in troubleshooting motors confidently and effectively.


Upon completion of AC Electric Motors & Drives Masterclass, the participant will be able to:

  • Understand the operation, construction and characteristics of AC induction motors.
  • Understand the principles of AC variable frequency control
  • Identify the differences between variable and constant torque applications
  • Understand the principle operation of Variable Frequency Drives for different applications
  • Select motors for Variable Frequency Drives.
  • Overview different types of motor duties.
  • Read & explain the motor NP data.
  • Motor de-rating factors.
  • Interpret motor performance curves.
  • Understand the VFD techniques.
  • Understand different types of Power Electronic elements.
  • Understand the rectifier and inverter operation.
  • To familiarize with various speed control methods and the important braking of motors, a capability of advanced hardware that can make huge potential savings in a large plant.
  • To discuss the future of this technology and the market trends.
  • The selection of AC convertors for VSD applications.
  • Installation and commissioning of ac variable speed drives
  • Problems related to VSD & motors.


AC Electric Motors & Drives training course is suitable for a wide range of technical professionals includes:

  • Maintenance Engineers and supervisors
  • Project Engineers
  • Operations & maintenance engineers, supervisors & technicians
  • Junior graduated Electrical Engineers.
  • Electrical Foreman and Technicians
  • And in general, Inspection, materials, safety and maintenance Electrical engineering team


The latest educational methods and strategies are employed. The course is designed to not only give the required fundamental knowledge but also to provide a strong background for all attendees towards practical industrial applications. The course will be highly interactive, with opportunities to advance your opinions and ideas. Participation is encouraged in a supportive environment. To ensure the concepts introduced during the course are understood, they will be reinforced through a mix of learning methods, including lecture style presentation, open discussion, case studies, simulations and group work.

Pre & Post course assessments will be used to measure the effectiveness of this training.


Module 1 - Introduction to Different Types of Electric Motors

  • KeyTopics:

    • DC motors.
    • AC motors (1-Ph & 3-Ph).
      • Induction Motors.
      • Synchronous motors.
    • Universal AC/DC motors.
    • What is a Drive?
    • Drive Principles of Operation
    • Types of Drives, Features and Principles
    • The need for Variable Speed Drives (VSDs)
    • Disadvantages of the VSDs
    • Motor power and torque
    • Work and power
    • Where does torque and speed come from?
    • Power consumed
    • International Codes and Standards

    Fundamentals of Motor Technology

    • Basic construction and physical configuration, windings.
    • Principles of operation and performance.
    • How the motor produces torque
    • Theory of operation.
    • Basic principles of rotating electric machines.
    • Fundamental principles of speed control.
    • Efficiency, torque, inertia, horsepower/power factor.
    • Torque-speed curves.
    • Motor Losses & Efficiency.
    • Induction motor design.
    • Duty cycles.
    • Insulation and Cooling requirements.
    • Selecting motors.
    • Classified Ex motors.
    • De-rating Factors (Temperature, altitude).
    • Voltage unbalance.

Module 2 - Solid-State Devices & Converters

  • KeyTopics:

    • Power diodes.
    • Power thyristors.
    • Controlling thyristors.
    • Gate turn-off thyristors (GTO).
    • MOS controlled thyristors (MCT).
    • Power bipolar junction transistors (BJT).
    • Field effect transistors (FET, MOSFET).
    • Integrated gate bipolar transistors (IGBT).
    • Integrated Gate Commutated Thyristor (IGCT).
    • Current & Voltage switching elements.
      • Single-phase rectifier
        • half wave rectifier
        • full wave rectifier
      • Three-phase rectifier
        • uncontrolled
        • controlled
        • Pulses (6/12/18/24)
        • Separate & series types
      • Active & Passive front End rectifiers
      • Voltage Source Inverter (VSI)
      • Current Source Inverter (CSI)
      • Applications of VSI & CSI.
    • Pulse Width Modulation (PWM) technique (6-P, 12-P, 18-P, ..)

    High Power Drives

    • Introduction to High Power Drives
    • Technical Requirements and Challenges
    • Line-Side Requirements
    • Motor-Side Challenges
    • Converter Configurations
    • MV Industrial Drives
    • Key components of an electrical drive system
    • Modes of Operation

    Soft Starters

    • Soft Starters principals
    • Constraints of direct starting
    • Starting of asynchronous motor
    • Conventional starters
    • Soft starter main objectives
    • Select a Soft starter

Module 3 - Speed Control of AC Motors

  • KeyTopics:

    • The need of VFD.
    • Energy Savings.
    • Fundamental Principles of Speed Control.
    • Introduction to VSD or Power Electronic Converters.
    • VFD system description.
    • VFD Operation.
    • Types and Designs of VSD.
    • Control Techniques & Relevant features.
      • Scalar Control (V/F Control)
      • Vector Control (Indirect Torque Control)
      • Direct Torque Control (DTC)
    • Braking Methods of Induction Motors
      • Single-Quadrant Operation
      • Four-Quadrant Operation

Module 4 - The Selection of AC Convertors for VSD Applications

  • KeyTopics:

    • Selection procedure.
    • Nature of the load.
    • Selection of correct size motor and VFD converter.
    • Motor Considerations with AC Drives.

    The sources of electromagnetic interference (EMI)

    • Harmonics generated on the supply side of AC converters.
    • The analysis of the harmonic distortion.
    • Power Factor & Displacement Power Factor.
    • Effects of harmonics on other equipment.
    • Acceptable levels of distortion in the mains supply system.
    • Methods of reducing harmonic voltages in the power supply.
    • The installation of a harmonic line filter close to the converter:
    • Voltages and current on the motor side of PWM inverters.
    • Effect of the high PWM switching frequency on long motor cables

Module 5 - Protection of AC VFD & Motors

  • KeyTopics:

    • Protective devices
      • Thermal Overload.
      • Over Current / Overload.
      • Earth fault protection.
      • Under-voltage / Over-voltage.
      • Under frequency.
      • Current unbalance or negative phase sequence.
      • Pole slip / Out of step.
      • Loss of excitation.
      • Over fluxing (V/F).
      • Stall protection / acceleration time / Start up supervision (Time between starts / Starts per hour).
      • Percentage Differential Protection for large motors.
    • Motor Temperature Detectors.
    • Frequency converter protection circuits.
    • Typical Protection settings

    Installation and Commissioning of AC VSD

    • General Installation and environmental requirements.
    • Electrical connections and Earthing requirements.
    • Control wiring and pre-commissioning.
    • Commissioning tests.

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