Fault analysis of motor NSK bearing

There are many reasons for motor failure. Here NSK bearing dealers share with you the fault analysis related to the bearing when the motor is out of order.

When the motor is running, the sound is not normal and there is abnormal noise.

One of the causes

1 The rotor is rubbed with the stator insulating paper or the wedge;

2 bearing wear or foreign matter such as sand in the oil;

3 fixed rotor core loose;

4 bearings are short of oil;

5 air duct packing or fan air hood,

6 fixed rotor core rubbing;

7 The power supply voltage is too high or unbalanced;

8 stator windings are staggered or shorted.

Motor NSK bearing overheating

1. cause of issue

1 too much or too little grease;

2 oil quality is not good with impurities;

3 bearing improperly matched with the journal or end cap (too loose or too tight);

4 bearing inner hole eccentric, rubbing with the shaft;

5 motor end cover or bearing cover is not flat;

6 The motor and load coupling is not corrected, or the belt is too tight;

7 bearing clearance is too large or too small;

8 The motor shaft is bent.

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Matching and pre-tightening of NSK imported bearings for household appliances

Bearings have a certain speed limit, NSK bearings are no exception. When the bearing rotates, as the bearing rotates faster, the temperature rise caused by the friction inside the bearing increases. The rotational speed limit is a speed allowable value that can be experienced in sintering, overheating, and continuous operation. Therefore, the limit speed of various bearings varies depending on the bearing structure, size, cage structure, material, bearing load, lubrication method, and cooling conditions around the NSK bearing.

In the various bearing size tables, the limit speeds of grease lubrication and oil lubrication are listed for each bearing. This value is the number of rotations allowed for a standard designed bearing under normal load conditions, grease lubrication, and oil lubrication operation. The value of oil lubrication is based on oil bath lubrication.

Depending on the type of lubricant, the brand is different and has other properties that are not suitable for high speed rotation. Therefore, the bearing rotation speed exceeds 70% of the limit rotation speed described in the bearing size table, and it is necessary to select grease and lubricating oil with excellent high-speed performance.

For more information and purchase please visit: https://www.supplyforever.com