AC Induction Motors
Load and speed variations in rotary electrical machines generally generate oscillations in the electrical signals being sent to them (namely current and voltage). By capturing these minute oscillations and later processing the data, these small perturbations can be matched to their source. Therefore, with a sensor placed at the electrical lines, it is possible to assess many faults generated from electrical, mechanical and process sources, such as:
- Motor and Variable frequency drive performance
- Rotor Bar health, Stator degradation
- Full power analysis (power factor, unbalanced voltage, current due to overheating, cable leakage,etc.)
- Harmonic analysis
- Eccentricity, resonance and damaged shaft
- Bearing Defects
Simply from an electrical perspective, transformers behave like electric motors without the moving parts.
Occurring imbalances in voltage, currents, power factors, and harmonics can be assessed similarly to AC induction motors.
Synchronous Motors and Generators
Synchronous motors/generators have similar design and construction as AC induction motors, except that the rotor has an active magnetic field, generated either by permanent magnets or by powering windings in the rotor with DC.
These motors/generators are frequently used in applications that require constant speed, independently from the load, such as reciprocating pumps, compressors, ball mills, and alternators.
Electric submersible Pumps
Wind and Tidal Turbines
Turbines are used to drive AC generators, which are essentially constructed as an AC synchronous induction motor, as there is no slip between the synchronous and actual rotation speed. Therefore, the mechanical and electrical performance characteristics can be analysed in the same manner as for AC induction motors.
Belt driven Conveyors
Gear driven electric machineryPicture of Bucket Wheel Systems
The major difference between reciprocating equipment and non-reciprocating is that reciprocating equipment has a non-uniform load, thus current, cycle. As the cycles demand more energy during some parts of the operation than others.
Motor Operated Valves (MOV)
MOV plays a critical role in the the industry.
Our electrical based condition monitoring allows detecting early signs of typical problems, which include:
- Degraded Valve Stem taper, Lubrication, Voltage, Stem-nut
- Wormgear tooth wear and Lubrication
- Obstruction in the valve seat area
- Motor pinion disengagement
- Stem packing adjustments
- Switch Activation
- DC motors and Variable frequency drives
This allows for recommendations for adjustment and modifications to bring the MOV back to their specific performance range.