Application of the magnitodiehlektrical composites based on nickel-zinc particles for resource-saving technologies treatment windings of electrical machines

Calculations which have shown that the optimum additive of submicron Ni-Zn powder in the compound must make 30-35 wt. % are given. According to the given calculations the maximum permissible size of a grain in submicron Ni-Zn powder M400NN used as an additive must satisfy the inequality: dfr^ <0,01 mm. It was determined that application of the magneto-dielectric composite on the basis of ultradispersed powder of nickel-zinc particles and an impregnating compound KP-34 for impregnation of the windings in electric and electronic wire wrap products, allows to eliminate, first, all power-intensive, noisy electromechanical devices by means of which windings are rotated under the jet of the impregnating compound falling on the front parts, because the jet can be bent and rotated along the front parts of the impregnated windings by rotating magnetic field. Secondly, it allows to provide more uniform flow coating of the front parts because the jet of the mentioned composition can be influenced by magnetic field. Thirdly, it allows significantly to increase the impregnation coefficient of the windings, which shows a saturation degree of inturn cavity by the impregnating composition. After impregnation the heating current is supplied to the winding which magnetic field is like a peculiar valve by means of which the impregnating composition stops to flow from winding cavities at their drying. Besides, after impregnation the front parts of the windings can be capsulated by the mentioned magneto-dielectric composition. For this purpose it is necessary to coat the front parts by the suggested composition during the current drying of the windings. High heat conductivity of this magneto-dielectric composition and high coefficients of impregnation allow to reduce overheating of the windings during their operation, which results in improvement of their operational reliability and durability by several times.

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