Generation of corona is formed because of the the smooth conductor to produce a non-uniform electric field, when the voltage rises to a certain value in the vicinity of the unevenness of the electrode with a small radius of curvature of the electric field around the discharge occurs due to an air free, corona. Not occur because of the weak electric field in the periphery of the corona collision free, corona peripheral electrically charged particles are basically ions, these ions will form a corona discharge current. Briefly, the small radius of curvature of the conductor electrode of the discharge air, they produce a corona.

    High voltage stator winding in the ventilation slots and straight out of the notch, and the winding end portion of the electric field is concentrated when the the local location field strength reaches a certain value, the gas partial ionization occurs, a blue fluorescence at the ionization, i.e. corona phenomenon. . The corona generating thermal effects and ozone, helium oxide, the coil within the local temperature rise, resulting in deterioration of adhesives, carbonized strand insulation and white mica, thereby enabling the strands loose, short circuit, insulation aging.

    Trapped in the ventilation slots and a notch at the high-voltage motor stator insulation surface electric field distribution is very uneven. When the local field strength reaches a certain value, the gas generating local free, light blue halo appears in the electrical fossa, generating corona. The occurrence of corona accompanied by hot, Austria, oxygen, nitrogen oxides generated, these are extremely harmful to the motor insulation. Moreover, due to the thermosetting insulating surfaces of the groove wall poor contact or unstable, the in electromagnetic vibration role, will cause the slot gap spark discharge. This spark discharge caused by local heating insulating surface will be severely eroded. All this will cause great damage to motor insulation.

    Order to effectively eliminate this corona phenomenon, correctly determine the the antihalation structure parameters and antihalation good choice of materials is very important.