As a mechanical system, electric rotating machines (electric motors, generators) can be examined using the same methods as any other rotating machine. However, due to their operation, not only mechanical forces and resulting vibrations occur in their case. The force effects generated through electromechanical energy conversion mediated by electromagnetic fields result not only in the desired torque but also in the time and space varying loads on individual machine elements.

If an electrical fault occurs, it leads to the formation of an unevenly distributed electromagnetic field. As a result, one must expect greater, asymmetric, or strongly varying mechanical loads on individual machine elements. This can be measured and diagnosed during operation (without disassembly) as vibration or as a phenomenon appearing in the supply current or the electric field.

Our company is primarily equipped for the detection of mechanical and electrical malfunctions in asynchronous electric motors, as well as for the detection of slip currents (induced voltages) causing bearing damage, which frequently occur when using frequency converters.

Our Services

Measurement and Spectrum Analysis of Supply Current

The most detailed fault analysis is provided by the supply current spectrum recorded phase by phase. Virtually every electrical fault in motors is reflected in the characteristics of the supply current spectra.

Measurement and Spectrum Analysis of Electromagnetic Field Strength (Flux)

Similar to detailed fault analysis as with supply current spectrum analysis. For example, in the case of asynchronous motors, most electrical faults can be detected in the flux spectrum as clear phenomena or changes. The measurement of flux is particularly invaluable where it is not possible to measure supply current phase by phase due to local conditions.

Measurement and Spectrum Analysis of Vibrations

Most (asymmetrically occurring) electrical and all mechanical faults can be detected in the form of vibrations. Accordingly, vibration analysis allows for the detection of many faults, but the measurement requirements (e.g., spectrum resolution) are usually orders of magnitude higher than in the case of "usual" rotating machine analysis. By measuring vibration and electrical parameters during operation, we can detect the following problems:

Mechanical Faults

Rotor:

• imbalance
• shaft misalignment (bending, crack/fracture)
• thermal bending
• resonance (bending and torsional vibrations)
• loosened elements
• faults in slip ring* or commutator* shape

Stator:

• bearing housing angle and shape faults
• resonance
• loosened elements
• fixation fault
• thermal deformation

Bearing:

• mechanical damage, wear
• overload
• misalignment or overtightening during installation
• inadequate lubrication
• damage due to slip current

Other External Factors:

• misalignment of shaft couplings
• foundation fault

Electrical Faults

Rotor:

• electromagnetic inhomogeneity (e.g., material defects)
• breakage of rotor bars* or their connections
• breakage of short-circuit rings* or commutator* segments
• contamination, short circuit, breakage of slip rings*, commutator*, or brushes*

Stator:

• winding or electromagnetic field asymmetry
• uneven or changing air gap
• voltage imbalance
• contact fault in connectors

External Factor:

• uneven or transient-containing power supply
• electrical phenomena (interference) from control* or frequency converter*
• current flow (slip current causing bearing damage or induced shaft voltage)

* not all electric rotating machines have these elements

Our Professional Background

Our colleagues are highly qualified, experienced vibration diagnostic engineers with VAT1 and VAT2 certifications, as well as machine diagnostic qualifications from Germany and the United States. They have accumulated experience through years of continuous diagnostic activities and also engage in high-level professional training.

Our Equipment, Instruments

Through our outstanding, extensive, and high-quality, proprietary, permanent equipment, we believe we can rightfully claim that our company is one of the best-equipped and most advanced engineering service providers not only in Hungary but also in Europe. We already possess many unique capabilities with our instruments and equipment, and we continuously update and expand our instrument park. Check out the tools and equipment currently in our inventory and see for yourself the truth of our statement above!