Electric Motor Diagnostic and Motor Overview

Introduction

This course explores the predictive diagnostic techniques for electric motors such as vibration analysis, current, flow testing magnetic. This training course covers all topics relating to both AC motors and their drives. AC motors represent the industry's workhorse in all applications. It is no exaggeration to suggest that more than half of the energy consumed worldwide is converted by AC motors into work and these are controlled by drives. Understanding maintenance and troubleshooting procedures of such vital industrial equipment means that reduced downtime and increased productivity for the company. The protection is a requirement along with their function and integration with the overall system ensures that such expensive apparatus is well guarded against failures which further offer safety for operations personnel as well.

This training course will feature:

• Understanding types of AC motors and their starting methods
• Principle of operation of variable speed drives
• Identification of the various types of variable speed drive
• Troubleshooting and maintenance of variable speed drives
• Protection of motors and drives

Objectives

Acquire knowledge of the different predictive techniques both as aesthetic dynamics that allow electrical and diagnostics of machines to develop a predictive scheme.

The objectives of the program are:

• Predictive Maintenance. Predictive parameters applied and technicians ELECTRICAL.
• Predictive dynamic techniques.
• Predictive techniques are aesthetic.
• Avera diagnostic engine vibration using spectral analysis. Description of the technique. Identification number of Avera and board diagnostics. RESOLUTION historical case.
• Avera diagnostic engine power by spectral analysis. Description of the technique. Identification number of Avera and board diagnostics. RESOLUTION historical case.
• Application of infrared thermograph electric motors. Description of the technique. Concepts of radiation. Discoverable hot spots. RESOLUTION historical case.
• Avera diagnostic tests using aesthetic. RESOLUTION historical case.
• Avera diagnostics by partial discharges. Description of the technique. Isolated and resolved the status of historical cases.
• Avera engine diagnostics using spectral analysis of dispersion magnetic flow. Description of the technique. Identification number of Avera and board diagnostics. RESOLUTION historical case.
• How to find and reset the thermal overload switch found on many electric motors
• Electric Motor Troubleshooting Guide - Diagnostic Table
• Understand the various types of AC motors and starters
• Determine the components and operations of variable speed drives
• Explain the different types of variable speed drives
• Analyze the common faults in a variable speed drive
• Design the protection requirements for motors and drives
• How to reset the motor switch on a furnace or air conditioner blower fan unit
• How to reset the motor switch on water pumps and well pumps
• Electric motor troubleshooting guide for electric motors that won't start
• Electric motor troubleshooting guide for electric motors that overheat
• Questions & answers on electric motor problems, motor overheating, thermal overload protection devices

Training Methodology

This is an interactive course. There will be open question and answer sessions, regular group exercises and activities, videos, case studies, and presentations on best practice. Participants will have the opportunity to share with the facilitator and other participants on what works well and not so well for them, as well as work on issues from their own organizations. The online course is conducted online using MS-Teams/ClickMeeting.

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.

• 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 combinations, i.e. motor/drive, and how to get the best of their trouble-free operation in the plant if possible.

Course Outline

Day 1: AC Motors

• Fundamentals of rotating machines theory, principles of operation of AC motors and their construction, rotor slip and torque-speed characteristic

• Three-phase AC induction motors, types, construction, characteristics, and applications

• Starting of induction motors and associated techniques and acceleration

• Speed control requirements of AC motors

• Selection of AC motors for industrial applications and service factor

• Medium voltage AC motors and applications 

Day 2: Troubleshooting and Maintenance of Motors

• Characteristics of motors, enclosures, and cooling methods

• Predictive maintenance, motor troubleshooting, and  diagnostic testing

• Failures in three-phase stator windings, rewind scenarios when a motor fails

• Troubleshooting and maintenance of AC motors, routine care

• Slow acceleration or refusal to starting of an AC motor, overheating and noise

• Modern motor diagnostics and testing instruments 

Day 3: Drives

• Fundamental principles and understanding of AC Variable Speed Drives

• Power semiconductors, diode, thyristor (SCR), IGBT, MOSFET, GTO, and others.

• Voltage-source, current-source, and pulse width modulated (PWM) inverters

• Benefits and applications of VSD

• Two-level PWM, regeneration and dynamic braking, volts per hertz control

• Medium voltage VSDs, switching transients, harmonics, and power factor 

Day 4: Troubleshooting and Maintenance of Drives

• Soft starters and selecting the correct VSD

• VSD analyzers for converter failures, inverters, and rectifiers

• Troubleshooting techniques and maintenance for VSD

• VSD parameter guidelines and settings

• VSD bearing failures and remedies

• Testing instruments and scope meters for VSD

Day 5: Protection of Motors and Drives

• Importance of protection of AC motors requirement and  overload protection

• Motor overload relay classes

• Numerical relays and motor protection

• Protection of inverters and electronic converters in VSDs

• Case studies, selection, and design of systems and their protection