Reliable Stator Core Fault Detection in Rotating Electrical Machines

March 17, 2020

Together with its new Stator Core Measurement Upgrade Option, OMICRON’s CPC 100 multi-functional electrical testing device can now perform reliable electromagnetic imperfection testing – also known as stray flux measurements – on the stator cores in rotating electrical machines. The test is performed to detect interlamination imperfections that can eventually cause overheating and damage of stator cores in motors and generators. 

A complete offline testing solution
Using OMICRON’s measurement solution, the stator core is energized with a small percentage of nominal flux and the stray flux on the surface is measured along the slots. The solution’s measurement sensor automatically moves along a rail mounted on the inside of the stator core, which scans the surface below for possible defects. The solution’s intuitive software enables users to generate on-site reports with a single mouse click.

Lamination shorts can damage the stator core
The stator core is made of thinly-stacked laminated steel segments, insulated from each other by a layer of varnish to minimize losses. If lamination shorts occur, a loop current can cause local hots spots, which can result in a partial melt down and expensive damage in the machine. 

Reliable fault detection 
Since faults cause imperfections in the magnetic circuit of the stator core, they can be easily detected by a measured increase of stray flux or a change in the phase. Faults can also be detected by comparing the measurement results of different stator core areas.

Regular verification 
Stator core measurements should be performed on a regular basis to evaluate the insulation integrity between the stator core layers of a machine during factory acceptance testing and commissioning, as well as after the machine has been put into service. The test results are compared with previous test results to verify stator condition.

OMICRON CPC 100 + Stator Core Measurement Upgrade Option

  • Semi-automatic scanning of the stator core
  • Measurement and excitation in one solution
  • Frequency-variable injection from 15 to 400 Hz
  • User-friendly work flow using Primary Test Manager (PTM) software
  • Automated reporting including results, graphs and heat map
  • Easily extendable excitation cable to meet specific measurement requirements
  • Multi-functional CPC 100 meets additional testing needs

More information is available at:

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