Signature Analysis

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Two Minute Tips
  • Motor Testing

Stator Inter-Turn Stress with Electrical Signature Analysis in Variable Frequency Drive Applications

Incorrect settings in a Variable Frequency Drive (VFD) application have an impact on the windings of an electric motor. When a drive is not set correctly, or not tuned when not using straight volts/hertz settings, stresses occur between the turns in a winding. In some cases, this will appear as small Partial Discharges (PD), and in others it can be increased leakage between turns. When these conditions occur, they introduce small current discharges that effect the air gap magnetic field of the motor.

Webinars
  • Condition Monitoring Management & AI

The Detection of Gear and Bearing Defects Using Electrical and Current Signature Analysis

In this presentation we will discuss how to use ESA/MCSA to detect bearing and gear defects in a variety of driven equipment including geared elevators, cooling towers, and other applications, even when we are looking at a few RPM. We will discuss how to determine the correct frequencies as well as how to determine the defect severity amplitudes in -dB, and how to isolate the machine you are testing from nearby machines. Several case studies will be presented including an AC building elevator, a cooling tower, and at least one complex (multi-stage) gearbox using both data collection and continuous monitoring.

Case Studies and Stories
  • Motor Testing

Reducing Costs with ESA and MCA™ Technology

More than 300 million electric motors are used in infrastructure, large buildings, and industry globally. These motors account for about 2/3rds of the industrial power consumption. Electricity is required in almost all areas of the plant to provide the driving force that either operates the equipment that produces the products or provides the services that the plant’s equipment was built to perform..

Case Studies and Stories
Rotor Bar Fault Maintenance
  • Vibration Analysis

Rotor Bar Fault Maintenance Issue: Vibration Sensor Alert

A 398 KW MV motor that runs a blower fan in a cement plant was showing strange behavior. The vibration equipment indicated vibration amplitudes that became chronic with the passage of time. The maintenance team, not knowing what the issue was, ran the motor until the bearings had to be replaced...

Two Minute Tips
Electrical Signature Analysis Used for Rotor Bar Analysis
  • Motor Testing

Rotor Bar Analysis Using Electrical Signature Analysis

Broken or fractured rotor bars are found as elevated Pole Pass Frequency (PPF) sidebands of line fre- quency (LF). PPF is calculated using the synchronous speed minus the running speed times the number of poles..

Interviews
  • Motor Testing

Electrical Signature Analysis

Growing part of industry including the clean energy sector relies upon electrical signature analysis to identify conditions through the power and powertrain..

Two Minute Tips
static eccentricity faults
  • Motor Testing

Static Eccentricity Faults Using Electrical Signature Analysis

Static Eccentricity (air gap) is a fault that is created when the rotor is not in the magnetic center of the stator. Static eccentricity can cause an increase in operating current, overheating, energy losses, and overloading of bearings...

Two Minute Tips
Stator Mechanical Faults Using Electrical Signature Analysis
  • Motor Testing

Stator Mechanical Faults Using Electrical Signature Analysis (ESA)

A stator mechanical fault is created when the stator core becomes loose within the motor frame, or if the windings are loose between the stator slots. A loose stator core or winding over a period of time will cause...

White Papers
The Trifecta of Motor Maintenance by Noah Bethel | PdMA Corporation
  • Motor Testing

The Trifecta of Motor Maintenance

Using the same concept of a trifecta (three factors for success), this article provides companies with the winning strategies of motor maintenance, focusing on the three reliability tasks for electric motor testing and the order in which they should be applied.

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