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Developed techniques
Predictive maintenance for motors and electric systems

ID Ingeniería uses MCE 2010 equipment manufactured by PdMA  and Series 435 Fluke equipment for engines and electric systems analysis.  Through the combination of static and dynamic tests these provide an effective diagnosis of the motor and/or analyzed system. These techniques are valid for both, alternating and direct current motors.

Advantages of implementing predictive maintenance in motors

 and electric systems:
Reduction in unexpected production downtime due to failure in electrical equipment.
 Reduction in repair and replacement costs of electrical equipment.
These tests do not damage electrical equipment.

Tests for Motors:

  • 1 - Static Tests
  • Polarization index (PI) and Dielectric Absorption (DA): Tests used to assess motor and associated circuits isolation condition.
  • Resistance to isolation: Corrected by temperature
  • Isolation capacity, inductance and resistance of windings and trends over time
  • Step Voltage: It allows checking how the isolation system responds to excessive tension
  • Influence of rotor (RIC): Diagnosis tests where the mutual inductance between the rotor and the stator are plotted in function of the rotor angle that confirms the presence of failures in the stator, broken or cracked bars and eccentricity in the air gap. At present it is used to replace the surge tester

Polarization Index

 

Step Voltage

RIC Test of rotor influence


  • 2 - Dynamic Tests
  • Power test: Used to assess Energy Quality of voltage and current time domain, total harmonic distortion of voltage and current (THD), NEMA degradation factors based on HVF); Power Circuit (unbalance of voltage and current, NEMA degradation) and Stator (Impedance unbalance).                 
  • Start test: allows capturing and plotting a motor RMS current during starting.
  • Demodulation current analysis test: it determines real speed of motor under test. It establishes windows for pole pass frequency and mechanical speed.
  • Rotor Evaluation: Used to evaluate rotor condition in an induction motor. It captures 34 seconds of the current consumed by the motor.
  • Eccentricity: in the air gap, jointly with the interaction between the electromagnetic forces of the rotor and the stator they may increase the risk of physical damage of coils and isolation. This test allows monitoring eccentricity severity over time anticipating any failure.


Start test

 

Energy quality test