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Objectives

• By the end of this Course participants will be able to:
• Understand the operation and construction of AC electrical motors and the electrical drives based on modern electronics technology.
• Be able to explain their characteristics and the need to match various load needs.
• Become more confident on how to maintain both motors and drives following well-established industrial procedures as outlined in standards.
• Become familiar with troubleshooting methods for both motors and drives following methodologies that have been developed by manufacturers in order to reduce downturn time dramatically.
• Learn how to utilize single-line drawings, and other documentation to successfully perform commissioning, maintenance and troubleshooting of both motors and drives.Become exposed to industrial standards and case studies so that to be able to apply this knowledge in the industrial plant as quickly and efficiently as possible.

The Delegates

• Electrical and mechanical engineers.
• Technicians and plant operations and maintenance personnel.
• Supervisors, team leaders and professionals in maintenance engineering departments.Anyone who wishes to update their knowledge on one of the most important equipment combination, i.e. motor/drive and how to get the best of their trouble-free operation in the plant.

Contents

• Introduction and Course overview.
• AC Motors
• Discussion – Goals
• Introduction to magnetics, excitation and the generation of back emf.
• Fundamentals of rotating machines theory, AC motors and their construction, rotor slip and principles of operation, equivalent circuit, torque-speed characteristics, motoring and regenerative region of operation, efficiency, inertia, horsepower, power factor.
• Single-phase and three-phase AC motors, types of single-phase motors, split-phase and capacitor.
• Starting of induction motors and associated techniques, accelerating.
• Speed control requirements of AC motors and load matching.
• Drives
• Basic principles of AC Variable-Speed Drives (VSD’s), constant torque region, constant power (extended speed) region, four quadrant operation.
• Power semiconductors, diode, thyristor (SCR), IGBT, MOSFET, GTO and others.
• Inverters, voltage-source and current-source, pulse width modulated (PWM) inverters.
• Two-level pulse width modulated inverter, DC link energy and capacitor sizing, regeneration or dynamic slowdown, dynamic breaking, regeneration.
• PWM waveforms and analysis, effects of PWM on motor bearings and insulation and life expectancy, volts/Hertz control, start up and operation, dynamics, PWM rectifier inverter systems.
• Switching transients, harmonics and power factor.
• AC drive line power factor, effect of AC input on drive operation, switching transients, insulation voltage stress, motor winding voltage distribution, radiated and conducted electromagnetic interferences (EMI), EMI filtering.
• Troubleshooting and Maintenance of Motors
• Characteristics of motors, enclosures and cooling methods, application data, design characteristics, insulation of AC motors.
• Failures in three-phase stator windings, predictive maintenance, motor troubleshooting, diagnostic testing for motors.
• Troubleshooting and maintenance of AC motors, routine care, dirt and corrosion, lubrication, heat, noise and vibration, insulation.
• Slow acceleration or refusal to starting of an AC motor, overheating and noise making of the motor, running of bearings at high temperature or making noise.
• Standards and testing.
• Troubleshooting and Maintenance of Drives
• Converter failures, common failure modes, fault current limit, device explosion rating, device application, thyristor failures and testing, identification of failed thyristor and diode, testing of thyristor and diode.
• Reversing circuits for single-phase and three-phase AC motors, finding open and short-circuit, detection of AC motor symptoms.
• Preventative maintenance, approaches, guidelines and scheduling, checking, dynamic and static inspections, detecting phase unbalances, loss of phases, and phase reversal.
• Protection of Motors and Drives
• Protection of AC motors, requirements, overload protection, currents during starting and stalled point, operation of motors under three-phase unbalanced power supply, motor de-rating due to unbalanced currents, stator and rotor protection, single-phase over-current relays, phase unbalance relays, faults in stator and rotor windings, earth faults, phase-to-phase faults, modern relay design and applications, protection targeting AC synchronous motors, over-voltage and under-frequency protection.
• Fuses, circuit breakers, magnetic and thermal, overload, eutectic, bimetal and solid-state, others.
• Motor protection curves, back-up protection.
• Protection of inverters and electronic converters driving motors.
• Case studies, selection and design of systems and their protection.

The Discount

10% in case of Three P. (or more)