In recent years, more and more high pressureMotorIt is used in factories and mines.Explosion-proof motor is a kind of motor that can be used in flammable and explosive plants, and it does not generate electric sparks during operation.Explosion-proof motorsMainly 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.The motor is an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction.Frequency conversion speed motorA 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.Due to the influence of various factors, the normal operation of high-voltage motors is often damaged by the phenomenon of corona discharge.Today, electrical workers analyze the causes of corona in high-voltage motors:
(1) The electric field distribution on the insulating surface of the high-voltage motor stator coil at the vent and outlet is very uneven.The production of corona is accompanied by the production of heat, oxygen and nitrogen oxides, which are extremely harmful to the insulation of the motor.
(B) The high-voltage stator winding ventilation slot, and in a straight line, the electric field is concentrated at the winding end, the thermal effect of ozone and corona, helium oxide, the local temperature rise in the coil, which leads to the gap adhesive , Carbonization, deterioration of mica insulation and white chain, so that loose strands, short circuit, insulation aging.
(XNUMX) In addition, when the company has poor or unstable contact between the surface of the thermosetting insulation structure and the groove wall, under the action of the electromagnetic environment vibration, it will cause spark discharge in the gap in the groove.The local temperature rise caused by the development of spark discharge of this kind of thought will prevent the insulating surface from being seriously corroded.All this will cause great harm to the students of motor insulation technology.
The reason for the above high voltage is the corona phenomenon in the motor. We hope to bring you some help and a simple analysis!
