Test rig for the characterization of the electrical lubricant properties in rolling bearings by use of the FBT four-ball tester
The E-Lub Tester determines the ohmic resistance and capacitance of your rolling bearing, thus of the lubricant used therein, under real operating conditions applied by the FBT four-ball tester.
For this, a high-precision impedance measurement is used, which was developed based on flucon's EPSILON+ laboratory instrument.
In addition, the E-Lub Tester enables EDM breakdown currents to be analyzed under a defined electrical load on the bearing so that the performance of greases and oils in rolling bearings can be specifically investigated under variable operating conditions (lubricant temperature, speed, load).
- determination of the lubricant impedance in rolling bearings
- suitable for axial roller bearings (type 51208) and radial ball bearings (type 6008)
- determination of ohmic resistance and capacitance
- EDM analysis (short-circuit-Scan): measurement of electrical breakdowns and ohmic currents during operation
- variable operating parameters: E-Lub Tester: lubricant temperature (automatic control), electrical load (common-mode voltage); FBT: running time, speed, load (all relevant data is stored in the program)
- automated measuring programs
- includes intuitive software for control and measurement with a Windows PC
- includes impedance calibrator
The E-Lub Tester consists of two main components: the FBT adapter serves as a rolling bearing carrier and it also includes the impedance and temperature sensors.
The control cabinet complements the composition. It holds the impedance meter as well as additional electronics for application of the electrical load and for the analysis of the EDM performance.
A fluid thermostat is used as an accessory and can be connected to the FBT adapter for automated temperature control of the bearing and its lubricant.
With the included PC software each test can be carried out automatically within a desired temperature range.
Background: breakdown currents in the lubrication gap
With the electrification making bigger progress every day, the electrical and dielectric properties of oils and greases are becoming more and more important. Lubricants used in the rolling bearings must have a certain specific conductivity so that static charges and resulting electrical breakdowns can be minimized to prevent damage to both bearings and lubricants.
The investigations of bearing-based spark erosion or Electric Discharge Machining (EDM) are relatively new. It is now known, however, that in addition to friction, electric breakdowns also occur in rolling bearings as a common phenomenon that causes considerable damage to the bearing shells: sudden discharges with high currents lead to pitting damage, i.e. crater and corrugation formations in the running surfaces.
Alos, the lubricant in the bearing ages excessively when the breakdown voltage is reached: local overtemperatures in the lubrication gap cause permanent damage to greases and oils so that the lubrication is severely affected.
Impedance measurement under real-life conditions - with laboratory-like accuracies
With flucon's E-Lub Tester it is now possible to determine the lubricant impedance directly in the rolling bearing, under real process conditions. The proven technology of the EPSILON+ lab meter is used for the measurement to give you maximum accuracy.
Intuitive software for automated testing
Both impedance measurement and EDM analysis of your lubricant can be carried out automatically, thanks to the included software for your Windows PC. Various standardized and custom operating modes are available.
Fields of application
The characteristic data generated with the E-Lub Tester can be used in lubricant development as well as for the following exemplary applications:
- electric motors with variable speed
- gear technology
- railway technology
- wind turbines
|Determined data||ohmic resistance, capacitance, breakdown frequency (number & amplitude of EDM currents)|
|Compatible substances||Greases and oils|
|Bearing types||51208, 6008|
|Material - FBT adapter||stainless steel with PEEK housing and assembly handle|
|Temperature measurement||PT100 by bearing|
|Temperature range||20°C to 120°C|
|Load||2400 N max.|
|Speed||6000 rpm max.|
|Frequency range||100 Hz to 10 MHz|
|Common-Mode Voltage||60 V max. (peak to peak)|
|Power supply||230 V AC, 50/60 Hz|
|Scope of delivery||FBT adapter (rolling bearing carrier) with sensor cables, mounting mandrel & ball, control unit in Rittal cabinet, "flucon E-LUB" PC software (for Windows OS)|
|optional accessories||Fluid thermostat w/ compressor, set of hoses and stopcocks, laptop|
First gen devices available now - apply for application partnership.
We are initially making the newly developed E-Lub Tester available to all interested companies as part of an application partnership. The aim is the prompt completion of the first generation of this powerful system; any further developments are reproduced in each delivered device.
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