Abstract: A thermosetting resin composition comprising:[A] a polyfunctional epoxy resin produced from a reaction between a mixture of at least two polyhydric phenols selected from (a) bis(4-hydroxyphenyl)methane, (b) bis(4-hydroxyphenyl)ethane, (c) bis(4-hydroxyphenyl)-propane, (d) tris(4-hydroxyphenyl)alkane and (e) tetra(4-hydroxyphenyl)alkane, and epichlorohydrin, and[B] an acid anhydride curing agent; and a coil and a panel formed of said composition.

Abstract: An epoxy resin composition for insulating a coil which comprises at least one polyfunctional epoxy resin, at least one latent curing catalyst, at least one filler and at least one surfactant, wherein the ceiling is set to the acid anhydride content in the composition at 10% by weight based on the weight of the epoxy resin; and a coil molded out of said resin composition.

Abstract: A thermoplastic resin composition for casting high-voltage coils containing two kinds of fillers (A) and (B), and products as molded coils and panels obtained by casting and curing the composition.The composition of the present invention contains 60%-85% by weight, based on the total weight of the composition, of a silica type filler which is an admixture (A) a spherical silica having an average particle diameter of 0.1-0.9 .mu.m and (B) a ground silica having an average particle diameter of 3-9 .mu., the ratio A/(A+B) being 1%-7% by weight.Products as molded coils and panels prepared by using the composition have good resistance to cracking and resistance to moisture.

Abstract: A resin molded stator comprising a stator core and coils as major constituents at least parts of which are molded into one piece by a molding material, said molding material comprising (a) a low-shrink unsaturated polyester resin, (b) a filler having a particle size of 44 .mu. or less, and (c) a fibrous material having a length of 3 mm or less, in proportions of 15 to 40% by weight of the component (a) and 60 to 85% by weight of a total of the components (b) and (c), and a weight ratio of the component (b) to the component (c) being 3/1 to 30/1, is excellent in crack resistance, moisture resistance and insulating properties.