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July 23 - 25, 2019

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Singapore Sustainability Academy

180 Kitchener Road
Singapore 208539


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Event Details

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