E301 - AC -DC Motors & Motor Controls

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2 days - 1.3 Continuing Education Units Awarded

Course Dates Download Brochure PDF
USD 995.00


Plant electricians, new engineers, mechanics (who work with and around electrical equipment) can gain significantly from this course.  This course provides fundamental knowledge of how the AC and DC motors function.  This fundamental knowledge is a critical piece of and O&M skills.  The course provides practical knowledge associated with how a motor is constructed, defining components the component purpose, and how it may be at risk.  This course also provides information on the skills necessary to implement a quality preventive maintenance program, to troubleshoot operational problems and corrective maintenance activities for the more common integrity issues.

This course discusses construction, operation, and routine preventive / corrective maintenance of:

  • AC & DC Motors
  • Motor Controls


  • Describe the fundamental design, construction, application and operation of all motors typically found in an industrial site.
  • Explain how a 3-phase motor direction of rotation is reversed.
  • Define torque, starting current, and armature reaction as they apply to AC and DC motors.
  • Describe the methods for determining various motor connections.
  • List and briefly explain six causes for rotating machinery failure.
  • Describe the various types of rotary machinery maintenance: visual inspections, tightness checks, air gap distance, and bearing lubrication and replacement.
  • Describe the following rotating machinery tests: insulation resistance, continuity, vibration analysis, and high potential.
  • Describe the electric-magnetic starting sequence of common AC and DC motors.
  • Describe fundamental operation of the motor controls associated with these start sequences.


  • Electric & Magnetic Fundamentals:  Magnetism,  Electromagnetism,  Field Strength,  Motor Action,  Ohm’s Law
  • AC & DC Motor Fundamentals:  Terms & Definitions,  Motor Enclosures,  Nameplate Data,  AC Motors, Induction Motors, Synchronous Motors,  Wound Rotor Motors,  DC Motors,  Shunt Motors,  DC Series Motors,  DC Compound Motors
  • Motor Control Fundamentals;  Enclosures, Motor Controllers, Control Devices & Symbols, Magnetic Contactors, Control Circuits, Hand-Off Auto Controls, Interlocking Methods for Reversing Control, Sequence Control, Motor Control Center, One-Line Diagrams, Elementary Diagrams, Developing a Control Circuit
  • Control of Motor Starting:  Full Voltage Starters, Reduced Voltage Starters, Wye-Delta Starters, Part Winding Starters, Speed Controllers, Consequent Pole Controllers, Variable Frequency Drives, Wound Rotor Motor Controllers, Synchronous Motor Controllers, Acceleration Control, Control Power, DC Controller, Vacuum Contactors, Routine Inspection & Maintenance, Troubleshooting
  • Motor Maintenance:  Causes of Rotating Machinery Failure, AC Rotating Machine Maintenance, AC Machine Testing, Special AC Rotating Machines, DC Machine Maintenance, Brush Rigging & Brush Maintenance, Causes of Unsatisfactory Brush & Commutator Performance, National Electric Testing Association Guidelines, Connections & Terminal Markings for AC Motors
  • Motor Branch Circuit Protection: Motor Branch Circuit, Safety Switches & Fuses, Molded Case Circuit Breakers, Motor Controller, Grounding & Preventive Maintenance, Troubleshooting
  • Motor Protection; Over-Current, Under-Voltage, Differential

What You Will Receive: 

  • HPC Technical Services' fully illustrated textbook:  AC&DC Motors and Motor Controls.
  • HPC's Certificate of Completion, including 1.3 Continuing Education Units.