Improving Dielectric Properties of Electrical Machines Insulating Varnish Using SiO₂ Nanoparticles

A Novel Polyester Varnish Nanocomposites for Electrical Machines with Improved Thermal and Dielectric Properties Using Functionalized TiO2 Nanoparticles

“…Secondly, TiO 2 nanoparticles are known for their facile surface functionalization process, allowing functionalized TiO 2 nanoparticles to be used frequently in dielectric nanocomposites [26,27]. In addition, the authors tested SiO 2 nanoparticles with varnish in a previous study [28], and it exhibited a maximum enhancement in the dielectric strength of about 12.6%. TiO 2 nanopowder (size = 21 nm and 99.5% purity) was purchased from Sigma Aldrich, St. Louis, MO, USA.…”

“…The electrostatic field is computed using the formula E = V/d for mushroom-mushroom arrangement as well as the approximation that the predicted sample thickness d means exceedingly thin with relation to the diameter of the electrode and V is the r.m.s value of the measured BDV. Moreover, Equation (1) may be used to calculate the observed breakdown strength values more precisely [28]:…”

“…To apply FEM, the field region is first divided into smaller triangle parts, called meshes, to reduce the energy throughout the field region of interest. Equations ( 3)-( 7) provide the electrical energy W stored within the full volume U of the region under study [28,62].…”

Electrical Properties of Alicyclic Epoxy Resins for Application to Varnish of Rotating Machine Winding

“…Epoxy resins (EP) is one of the solid polymer materials with excellent electrical, thermal, and mechanical properties, and are commonly used as insulating materials [1,2]. EP is sometimes used as an insulating varnish for windings in electrical equipment, such as motors for automotive use due to its excellent impregnation properties [3]. On the other hand, thermal management of power equipment has become an issue in recent years as power equipment has become smaller and more sophisticated.…”