SCEM-P: Motor Driven Systems

Next Course Date: 27 - 29 July 2020

Administrative Details

Time: 9am - 6pm

Venue: 180 Kitchener Road, #06-10 City Square Mall Singapore 208539; Singapore Sustainability Academy

Contact: +65 - 6338 8578

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Course Summary

In industrial plants and facilities, electric motors and motor driven systems are a part of everyday life. Engineers with job functional responsibilities for energy and facility management need a good understanding of how motor driven systems work. By gaining a good basic understanding of these integrated systems, engineers will be able to appreciate their potential and limitations.

Course Objective

Topic 1: Concept of Power and Energy

  • Calculation of energy savings
  • Power factor correction
    • Implementation at component or device level
    • Implementation at system level
    • Economic benefits
    • Technical advantage/disadvantage comparison

Topic 2: Motors

  • Operation and characteristics of electric motors
    • Conventional DC Motors - shunt, series and compound
    • AC Induction Motors – cage and wound rotor types
    • Conventional synchronous motor
    • PM synchronous motor
  • Brushless DC Motor (BLDC, self synchronous motor)
  • Motor efficiency
    • Various losses in motors: copper , iron, core, stray, windage, hysteresis, eddy current losses
    • Motor loading and efficiency
  • High efficiency motors
  • Speed control methods
    • Variable applied voltage
    • Variable armature current
    • Variable motor field
    • Variable frequency
    • Combination of the above
  • Selection and sizing of motors (including industry standards)

Topic 3: Drive Systems

  • Power Electronic Converter and Inverter Switching Devices
  • Main Components of VSD
  • Types of VSD
    • Voltage Source Inverter
    • Current source inverter,
    • PWM
  • Key features of VSD
    • Rectification
    • Inverting
    • Harmonic filtering
    • Power factor correction
    • Voltage level regulation / adjustment
  • Energy reversal
  • Selection, sizing and efficiency of VSD for variable torque load / constant torque load
  • Application of converters for AC/ DC motor speed/torque control
  • Application of converters for Permanent Magnet Synchronous (PMSM) speed/torque control

Topic 4: Driven Systems

  • Types of transmission (belts, gears, coupling, chain, etc)
  • Comparative features of transmission system
  • Selection, Sizing and Efficiency of transmission system
  • Typical Driven Systems- Pumps, Fans, Compressor, Hoist, Conveyor, etc
    • Parallel and series pumping
    • Losses in pumps, pump efficiency
    • Fan losses and fan efficiency
  • Affinity Laws – use affinity law to determine the min % of reduction in speed for a given % of reduction in quantity of delivery,
  • Flow of regenerative energy
  • Energy saving opportunities by applying variable speed to motors driving centrifugal pumps and fans and application of affinity laws
  • Sizing of motors for variable torque load such as for centrifugal pumps, fans and compressors as well as for constant torque load
  • Energy saving opportunities for linear load
    • Geared/gearless elevator systems and escalators
    • Counterbalance
  • Case studies

Target Audience

  • Energy Managers
  • Management Representatives
  • Facilities/Energy Managers, Executives and Supervisors


Dr. Jahangeer K. Abdul Halim graduated with a Master of Science (M.Sc.) in Mechanical Engineering from National University of Singapore in 1998. He was awarded a Research Scholarship by the National University of Singapore (NUS) in 1999 to undertake a research project on solar energy and was awarded a Master of Engineering (M.Eng.) degree in 2002.

Dr. Lal Jayamaha is the author of the book “Energy Efficient Building Systems” published by McGraw-Hill, USA and the founder of LJ Energy Pte Ltd which is one of the leading ESCOs in Singapore


Reference Materials