Causes and prevention methods of electric corrosion of groove parts
On the surface of the antihalation layer at the center of the contact point between the anti-halation layer and the groove wall of the groove portion coil, in addition to the voltage drop generated by the above-mentioned capacitor current on the antihalation layer, there are main magnetic flux and slot leakage magnetic flux. The electromotive force induced on the halo layer. In a motor with low on-line load, the electromotive force induced by the leakage flux is small and negligible. Therefore, the maximum voltage at the center of the two contact points is equal to the voltage drop generated by the capacitor current and the vector of the main flux induced electromotive force. The experiment proves that under electromagnetic vibration, when the combined voltage reaches 130~150 volts, the gap will produce strong spark discharge and corrosion insulation. In order to avoid the occurrence of electrical corrosion, measures must be taken in the process to minimize the distance between stable contact points and to select a reasonable anti-corona surface resistivity.
For thermoset insulated coils, it is generally required that the span between the stable contact points is less than 50 cm. For this reason, certain fixing measures must be taken to ensure sufficient stable contact points between the coil surface and the groove wall. At the same time, the surface resistivity of the anti-halation layer should be no more than 5×104 ohms in the large-capacity motor, and the medium-capacity motor should be no more than 5×105 ohms; in order to prevent the loss of the anti-halation layer from increasing too much, in the large-capacity motor The halo surface resistivity and medium capacity motor should not be lower than 5 x 103 ohms.
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