Electrical Motors: Technology, Operation & Maintenance


Who should attend?

  • This course focuses on the technical development of industrial electrical motors.
Audience :
  • Electrical and mechanical engineers, supervisors, technical staff involved in electrical motors maintenance and operation.

Level : Advanced

Course Content


      • Working principle of induction and synchronous motors.
      • Features: power, current, torque and power factors.
      • Technology and main parameters.
      • Protective modes in regards with external environments: temperature classes, protection class index, hazardous area motors, ATEX protection.
      • Electrical and thermal protection of the motor as well as the use of temperature sensors.
      • API 541 asynchronous guidelines for refinery and petrochemical motors.
      • Efficiency motor's standards IEC 60 034-30/IEEE 112.

      • Power and HV/LV range, fields of use and typical applications.
      • Speed and motor control as well as network consequences. Synchronous motor: torque control and various technologies.
      • Induction motor: standard starting methods depending on mechanical load, motor power and network capacity; limiting conditions due to the grid; number of start constraints. Electronic starting method (soft starter). Advantage for driven centrifugal machines.

      • Main characteristics and constraints for a motor installation.
      • Skid and shim. Shaft alignment. Comparison to reference datasheets.

      • Bearings: temperature, vibration, lubrication monitoring. Mechanical failures, vibration footprint.
      • Impact of magnetic rotor unbalancing and leak of current. Electrical impairment of the rotor: noise and vibration analysis.

      • Part identification in workshop.
      • Bearings assembly, housing repair, clearance 
and concentricity control.
      • Electrical insulation and phases balancing control.
      • Impact of frequency inverters and harmonics on electrical coils insulation and the bearings.
      • Coil insulation repairs: vacuum coils impregnation, technology and quality. Rewinding and coils positioning according to magnetic circuit's notches. Electrical controls (electrical resistance, insulation, polarization…).
      • Balancing: quality standards, unload and load tests. Repair specification: specification content as well as work acceptance.
      • Visit of a motor repair workshop.

Learning Objectives

  • Upon completion of the course, participants will be able to:
  • explain the operation and the main failures of electrical motors,
  • list the diagnostic tools & monitoring equipment in operation,
  • describe main setting rules.

Ways & Means

  • Visit of a motor repair workshop.
  • Motor disassembly & assembly in case of an available workshop.