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Fault diagnosis of asynchronous motor bearings based on infrared temperature measurement

2018-10-30
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Aiming at the problem of frequent burning of asynchronous motor bearings of long-distance ships, a Y100L-2 motor was used as the research object, and the finite element method was used to establish a three-dimensional thermal conductivity model of the motor rotor. The three-dimensional temperature field of the motor rotor under different operating conditions of the motor bearing was simulated, and the motor bearing failure test was analyzed. The analysis results show that regardless of whether the bearing is faulty, the temperature of the motor end cover gradually decreases from the inside to the outside along the radial direction; the temperature changes slowly at the part directly opposite the end cover bearing seat, but the end cover temperature drops rapidly from the outer diameter of the bearing to the outside; the effect of load change on the temperature rise of the motor end cover is much greater than the effect of bearing damage on the temperature rise of the end cover; the corresponding bearing status cannot be judged solely by the surface temperature rise of the end cover, but the bearing status can be judged by the change of the surface temperature rise of the end cover under the same load condition.

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