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Operation, Maintenance & Inspection of Electrical Motors

5 days IR/OMIEM
  • Electrical and mechanical engineers 
and supervisors, technical 
staff involved in electrical motors 
maintenance and inspection.
  • To provide technical development 
in terms of operation 
and routine maintenance 
of electric motors.
Learning Objectives
  • To explain the operation and the main failure of electric motors.

  • To list the diagnostic tools in operation.

  • To participate in control and fixing operations
  • To describe main setting rules.
Ways and means
  • Visit of a motor repair workshop
  • Motor disassembly & assembly 
in workshop.

Operation principle and technology 2 days
  • Working principle of induction and synchronous motors
  • Features: power, current, torque and power factors
  • Technology
  • Protective modes in regards with external environments: temperature classes, 
protection class index, hazardous area motors, main "EEx" protection.

  • Electrical and thermal protection of the motor as well as use of temperature sensors.

  • API 541 asynchronous guidelines for refinery and petrochemical motors.

  • Efficiency motor's standards IEC 60 034-30 / IEEE 112.
Variable speed features 1 day
  • Power and HV/LV range, fields of use and typical applications.
  • Power range and voltage HV/LV, and 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.
Failure diagnosis in operation 0.5 day
  • Bearings: temperature, vibration, lubrication monitoring.

  • Mechanical failures: static eccentricity or rotating gap, vibration footprint.

  • Impact of magnetic rotor umballancing and leak of current
  • Electric impairment of the rotor: noise and vibration analysis.
Control and repair techniques 1 day
  • Bearings: bearing assembly, housing repair, clearance 
and concentricity control.

  • Impact of frequency inverters and harmonics on electrical coils insulation 
and on the bearings.

  • Coil insulation repairs: vacuum coils impregnation, technology and quality.

  • Rewinding and positioning of the coils according to magnetic circuit's notches.

  • Electrical controls (electrical resistance, insulation, polarization, ...).

  • Balancing: standards and mechanical balancing quality, 
unload and load tests.

  • Repair specification: specification content as well as receipt of material after work.

  • Visit of a repair workshop.
Installation 0.5 day
  • Skid and shim.
Shaft alignment.
Practical work
  • Part identification in workshop.
  • Electrical insulation and phases balancing control.