Selection, Applications, Operation, Diagnostic Testing, Protection, Control, Troubleshooting and Maintenance of Motors and Variable Speed Drives

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Selection, Applications, Operation, Diagnostic Testing, Protection, Control, Troubleshooting and Maintenance of Motors and Variable Speed Drives Course
Introduction:
Delegates will learn about the many kinds of motors and drives as well as the terminology related to them during the session. The workhorse of the industry for small, medium, and large-sized applications is the AC motor. It is hardly hyperbole to say that AC motors, which are managed by drives, transform more than half of the energy used globally into labor. These drives are becoming more electrically and intelligent by the day, and the SCADA system of the plant can be used to monitor and control them.
Course Objectives:
The objectives of the program are:
- Have an understanding of the different types of motors and drives.
- Be able to operate motors as close as possible to the design efficiency.
- Will be able to monitor efficiency, availability, and reliability.
- Have learned about selection, operation, and maintenance strategies.
- Be able to troubleshoot motor and drive problems.
Who Should Attend?
This program is directed towards supervisors, team leaders, and professionals in maintenance, engineering, and production. it is suitable for who expects to become involved at any stage in project applications and applicable maintenance technologies. The program will also benefit anyone those wishes to update themselves on pump and compressor technology, judge the suitability of different types of pumps and compressors for their needs, and learn how to operate and maintain them for the benefit of their organizations.
Course Outlines:
- An Introduction to Motor Types
- Induction, DC, servo, synchronous, linear, etc.
- Induction Motors
- Introduction to AC induction motors and their construction, rotor slip and principles of operation, equivalent circuit, torque-speed characteristics, motoring and regenerative region of operation
- Starting of induction motors and associated techniques
- Speed control methods of induction motors
- Characteristics of motors, enclosures, and cooling methods, application data, design characteristics, insulation of AC motors
- DC Motors
- Introduction to DC motors and their construction, principles of operation, and torque-speed characteristics.
- Conversion of AC to DC
- Motor Selection
- Torque/speed, ripple, peak
- Acceleration
- Load/power density
- Thermal capacity
- Efficiency
- Motor Diagnostics & Troubleshooting
- Identification of damage mechanisms & remediation
- Damage Mechanisms
- Dynamic defects - imbalance, misalignment, looseness
- Insulation degradation
- Stator faults
- Rotor faults
- Controller faults
- Monitoring Techniques
- Vibration analysis
- Thermography
- Motor current analysis
- Motor resistance/capacitance analysis
- Troubleshooting
- Motor Control
- Drives, protection systems, and controllers
- Drives
- Induction motor starters & drive panel instrumentation & control
- DC drives, protection & control
- Protection Systems
- Short circuit
- Ground
- Single phasing
- Rotor Lock, etc.
Variable Speed 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, reg generation
- 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, 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
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 the 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.