Electric Motor Testing [Energized & De-Energized]
Electric Motor Testing - Energized and De-Energized Testing Techniques
ESA, MCSA, and Power Quality Analysis Level 1
Course Length = 32 hours including practical and written examinations
This 32 hour course aims to educate students on the tools and techniques associated with assessing the condition and presence of faults in energized electric motors and motor driven equipment. By identifying problems in advance of catastrophic failure, we can proactively maintain equipment which leads to improved uptime and reliability, longer equipment life, and lower cost of ownership.
The intent of this course is to provide a sound technical foundation and practical experience for the technician using a combination of lectures, training aids and test equipment, and hands-on lab exercises that reinforce learnings.
Course Introduction & Overview
- Introduction and course overview
- Brief History of Electricity and Electric Motor Testing
- Introduction to electric motor failures modes
Topic 1 - Direct Current (DC) Theory Review
- Ohm's Law
- Power
- Series & parallel resistive circuits
Topic 2 - Alternating Current (AC) Theory Review
- AC circuits - series/parallel circuits
- Resistance, inductance & capacitance
- Reactance and impedance
- Data Collection Labs
Topic 3 - Theory Review of Transformers and Distribution
- Transformer Construction: core & windings
- Turns and Voltage Ratios
- Single Phase vs. Polyphase
- Transformer Configurations: Delta/Wye, Delta/Delta, Wye/Delta, and Wye/Wye
- Line voltages and phase vectors
- Electrical distribution and grounding systems
Topic 4 - Motor Nameplate
- Model, Serial, Type, NEMA Design Classification
- Horse Power, Volta and Amps, KVA
- RPM and Frequency
- Service Factor, Temperature and altitude affects
- Insulation class & types
- Torque curves vs. application
- Efficiency
- Important information omitted from nameplate
Topic 5 - Motor Construction
- Stator construction, statur core and frame
- Stator windings, stator core testing and damage
- Laminations design and grades
- Core losses - hysteresis, Eddy currents
- Bar types and configurations
- Rotor construction, Rotor core and frame
- Rotor testing & anomalies that affect rotor performance
- Motor rewind procedures
Topic 6 - Motor Operation Theory
- AC generators design & construction
- Induced voltage and frequency
- 3 phase motor components & rotating magnetic field
- Synchronous speed
- Three phase motor operation
- Slip, anomalies, and factors that affect motor RPM
- Starting & torque curves
- Affect of number of poles
- Power Factor (PF)
Topic 7 - Theory to Support De-Energized Electric Motor Test - Motor Circuit Analysis
- Insulation resistance testing
- Polarization index (PI)
- Dielectric Absorption Ration (DAR) test
- Data Collection Labs
Topic 8 - Motor Current Signature and Electrical Signature Analysis
- Safety and technical documentation to support Electric Motor Testing
- FFT generation, current/voltage spectral analysis, demodulation
- Electrical anomalies
- Mechanical anomalies
- Data Collection Labs
- Practical Examinations
Review & Examinations
- Comprehensive Course Review
- General Course Examination
- Data Analysis Examination
