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Electrical Motors: Technology, Operation & Maintenance

5 days IR/OMIEM
Level
Advanced
Audience
  • Electrical and mechanical engineers, supervisors, technical staff involved in electrical motors maintenance and operation.
Purpose
  • This course deals with technical development in terms of operation and maintenance of electrical motors.
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.
Prerequisite
  • No prerequisites for this course.
Ways and means
  • Visit of a motor repair workshop.
  • Motor disassembly & assembly in an available workshop.

OPERATION PRINCIPLE & TECHNOLOGY 2 days
  • Working principle of induction and synchronous motors.
  • Features: power, current, torque and power factors.
  • Technology and main characteristics.
  • 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.
VARIABLE SPEED FEATURES 1 day
  • 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.
INSTALLATION 0.5 day
  • Main characteristics & constraints for a motor installation.
  • Skid and shim. Shaft alignment. Comparison to reference data.
FAILURE DIAGNOSIS IN OPERATION 0.5 day
  • 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.
CONTROL & REPAIR TECHNIQUES - PRACTICAL WORK 1 day
  • Bearings assembly, housing repair, clearance 
and concentricity control.
  • Part identification in workshop.
  • 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: standards and mechanical balancing quality, unload and load tests.
Repair specification: specification content as well as work acceptance.
  • Visit of a motor repair workshop.