magnetic field lines
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As the title suggests: Regarding the state of the magnetic flux lines of the motor associated with a screw refrigeration compressor, is it because the magnetic flux lines are not defined, or is it due to an unspecified distance between the pulleys? The shaft runout of the motor rotor is quite significant
It seems that the magnetic center line isn’t properly aligned; when installing the coupling, it’s essential to do the calculations carefully, otherwise deviations may occur, leading to such slight vibrations
1 It’s impossible to detect the condition of the motor shaft bearings visually at ?2
Yes! Axial movement of magnetic flux lines can damage the thrust bearing
Loosen the coupling bolts between the motor and the compressor, measure the distance between the couplings, then start the motor and let it run for 5 minutes before stopping it. After the motor has come to a complete stop, measure the distance between the couplings again. By checking the difference between these two values, it is possible to determine whether there is an issue with the magnetic centerline.
Does it affect bearing temperature and vibration? If it doesn’t affect anything, ignore it. If there is indeed an impact, it is necessary to consider the magnetic center line for realignment
For motors equipped with sliding bearings, manufacturers generally specify the position of the magnetic center line – which is the distance from a certain end face of the coupling to a specific point on the motor housing (this varies from one manufacturer to another). This distance is used to determine the appropriate spacing between the couplings; with accurate calculation, there will be no significant misalignment.