What signals data are sent by the SMS device to the cloud?
The SMS sends the following data:
- Two vibrations signals data: Vibration X (tangential vibration) and Vibration Z (axial vibration)
- One electrical signal: it is the magnetic field generated by the motor
- Two temperatures: one sensor measures the environment temperature and the other measures the motor frame temperature
The vibrations signals and magnetic field signal are acquired with a sampling frequency of 6.25kHz and 15k samplings data points.
You can visualize the plots of this data by selecting a motor and going to History plot -> Performance
What is the health index?
The health index represents an evaluation of the state of each fault category, and goes from 0 to 10: the closer to 0 the result, the worse the condition of that component, and the closer to 10, the better.
red: 0-4
yellow: 5-6
green: 7-10
Can you explain the type of faults detected by SMS?
The SMS can identify nine components of the motor as origin of the faults.
1. Power system
Electrical: Problems in the three phases of the power supply, which can generate an imbalance of the motor currents. E.g. Loss phase.
2. Stator Winding
Electrical: Problems in one of the phases of the motor, which can generate an imbalance of the motor currents. E.g. Coil short circuit.
3. Rotor
Electrical: Short circuit rings problems. Eg. Broken rotor bar.
4. Motor Shaft / balance
Mechanical: Unequal distribution of mass that causes the load to shift from the center of rotation. E.g. Rotor flexion.
5. Eccentricity
Mechanical & Electrical: Asymmetric air gap between the rotor/stator. E.g. Bent shaft; Improper bearing installations.
6. Bearing
Mechanical: Mechanical stresses or contamination can lead to small cracks or defects that occur in the bearing, creating vibration problems. E.g. Pitting
7. Misalignment
Mechanical: Occurs when two rotating shafts (motor and the load) are not aligned, external misalignment. E.g. Pulleys misalignment.
8. Cooling System
Temperature: Applicable to motors cooled with an external fan. Can determine problem with the fans attached to the shaft or externally attached to the motor. E.g. Fan cover collapsed.
9. Loose foot
Mechanical: Structural looseness occur when the motor base or connection to the motor base are not properly tightened. E.g. Motor not fixed to the base frame.