At present, China [/ align] large high-voltage motors, mostly separate use of sliding bearings, bearing failure is generally less leakage problems affecting its bearing on the motor is not great. The structure of some large and medium-sized high-voltage motors motor is "cap sliding bearings" and "End - Rolling", this part of the motor bearings there is a lot of problems:

1, cover sliding bearings: the prevalence of such motor rotor axially moving string large, bearing heat and leakage phenomenon. Because the oil spill caused by the corrosion of the motor windings, the motor inside the putty excessive motor temperature is too high. In addition, the slide bearings are also a lot more complicated than maintenance of rolling bearings.

2, the general structure of the motor: the production of a portion of box-type motor bearing failure is more, after analysis found that the main question is: on the outside of the bearing is provided with a small gap from the bearing block oil pan. So that is not conducive to the bearing of circulating heat and grease, but also increase the difficulty and cost of maintenance work, and after mating block oil pan bore and shaft loose, resulting in abnormal noise or emerge from the shaft, causing serious malfunction. Three Thai SUNTHAI

3, double bearing motor: Part box HV motor, using the structure of the double load side bearing. To overhaul the structure of these motors work to bring a greater degree of difficulty, when the motor maintenance, bearing can not be cleaned, check and must be replaced, resulting in increased maintenance costs. Further motors, bearings running temperature of this structure are high, low life.

4, type of bearing: My most negative side of the motor bearings "cylindrical roller bearings", airside as "angular contact ball bearings" in the operation of the motor, the change in length of the rotor from the negative side adjustment. At this point if the motor and the mechanical coupling is "flexible coupling", the impact on the motor and no large machinery, but if it is "rigid coupling" is the vibration motor or mechanical occurrence, and even cause the bearing damage. Three Thai SUNTHAI

5, the bearing carrier and permissible speed: China's motor bearings, most of the general negative side is the choice of "medium-sized roller bearings." Carrying capacity of the bearing is much higher than the calculated value, but bearing the permissible speed is the actual speed of the motor differ little or not enough, so this is bearing fever, an important reason for the frequent damage.

6, the design bearing attachment: attachment of the motor bearing current mostly: bearing sleeve and the inner and outer oil cap type structure. Advantage of this structure is simple, the drawback is poor sealing. Dust from entering into the bearing, accelerated bearing wear and damage, and most of the bearing structure is too small because of the oil chamber and gear oil pan causing serious bearing heating.