Failure analysis of motor cooling system failure: Mainly the failure of the water cooling system without water leakage in the stator, and the failure of the leakage rotor.FrequencyMotorA general term for motors driven by frequency converters.In fact, the motor designed for the frequency converter is a special frequency conversion motor. The motor can achieve different speeds and torques under the drive of the frequency converter to adapt to the changes in the demand of the load.The motor is an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction.Explosion-proof motorsA kind of motor that can be used in flammable and explosive plants and does not generate sparks during operation.Explosion-proof motors are mainly used in coal mines, petroleum and natural gas, petrochemical and chemical industries.In addition, it is also widely used in sectors such as textiles, metallurgy, city gas, transportation, grain and oil processing, papermaking, and medicine.Mainly due to material defects of the cooling water system pipes, installation defects, or due to leakage of impurities in the water cooler and electric corrosion, the cooling efficiency is reduced, mechanical vibration, when the temperature rises, the insulating rod overheats and pyrolyzes.Foreign matter blocks the water cooling pipes and gas blocks, and the damage caused by the hollow wire discharge can also cause the generator to overheat and eventually burn the insulation.The fault is manifested by the insulation pyrolysis when the temperature of the direct stator bar and cooling water rises.
The consequences of the fault include overheating of the stator windings, reduced insulation capacity of the stator windings, grounding of the stator windings, short circuit or burnout of the windings, burnout of the stator windings or stator lead wires, load reduction operation or forced shutdown of crew members, and generator burnout.Another type of research on synchronously controlled generators mainly includes that the fault is the mechanical equipment fault of the rotor technical support system shaft system: the generator rotor body, the rotor as the support and the generator frame fault.Rotor shaft fault diagnosis methods mainly provide characteristic information analysis based on different vibration data signals. The theoretical knowledge is relatively developed and mature, and the practical teaching experience is also very rich.The common manifestations of failures are: imbalance, misalignment, rotor cracks, mechanical looseness, bearing failure, oil film instability, etc.
