Motors are the workhorse of industrial, building and commercial electrical power systems. This course combines theoretical and practical considerations and aspects of operational principles of motors, their types, selection, testing, maintenance and troubleshooting. The course emphasizes motor’s operational performance characteristics and electrical properties. The discussion is based on the latest IEEE and NEMA Standards governing motors and applications.

Objective To provide a comprehensive understanding of principles of operation, types, selection, testing and commissioning, protection, maintenance and troubleshooting of AC electric motors. Target Audience Electrical professionals who need to refresh and expand their knowledge, maintenance managers, and power system consultants. A basic understanding of electrical system operations is needed, but participant do not necessarily have to be experts in the areas covered. In addition, professionals who are starting their career in the field of power in electrical utilities, industrial or commercial and institutional facilities will profit from this course. Program Outline (1.2 CEUs / 12 PDHs) DAY 1 Basic Principles Electric currents and magnetic fields Hysteresis, and eddy current losses Efficiency and Losses Induction Motors: The Basics Rotating Magnetic Fields Motor operational characteristics Motor construction Features Motor Operational Characteristics Motor power and torque speed characteristics Variations in motor torque speed characteristics: effects of voltage, frequency and unbalanced sources Motor design classes Motor insulation classes Types of Electric Motors Rotating magnetic fields in single-phase induction motors Operational principles of single phase motors Equivalent circuits for single phase induction motors Starting single-phase induction motors Shaded-Pole Motors Split-Phase Motors Permanent Split-Capacitor Motors Capacitor Start Motors Capacitor-Start-Capacitor-Run Motors Repulsion Motors Design letters of single phase small motors DAY 2 Mechanical Considerations Vibrations Sound Heating and Cooling Motor Protection Items to Consider in Protection of Motors Types of Protection: Undervoltage Phase unbalance, instantaneous phase overcurrent Time-Delay Phase Overcurrent, Overload (Phase Overcurrent) Instantaneous Ground Overcurrent, Time-Delay Ground Overcurrent Phase Current Differential, Split Winding Current Unbalance Stator Winding Overtemperature, Rotor Overtemperature Induction Motor Incomplete Starting Sequence Protection Protection Against Too Frequent Starting Rotor Winding Protection Lightning and Surge Protection Protection Against Overexcitation from Shunt Capacitance Protection Against Automatic Reclosing or Automatic Transfer Protection Against Excessive Shaft Torques Developed During Transfer of Motors Between Out-of-Phase Sources Protection Against Failure to Rotate or Reverse Rotation Mechanical and Other Protection Motor Maintenance, Testing and Troubleshooting Failure modes Bearing and lubrication Preventive maintenance Testing On-line Diagnostic Testing Motor Selection and Application Electrical Factors to consider Mechanical Factors to consider Application considerations Economics of motor owning Instructor