Producing method for electrical insulating structure, electrical insulating structure and rotating electrical machine

1. A producing method for an electrical insulating structure that covers an outer surface of a to-be-insulated object, the method comprising:

a taping step of winding a main insulation tape on outside of the to-be-insulated object;

a spraying step, which is performed after the taping step, of spraying nanoparticles onto the outer surface of the wound main insulation tape;

a vacuum drawing step, which is performed after the spraying step, of vacuum drawing the tape-wound to-be-insulated object; and

an impregnation step, which is performed after the vacuum drawing step, of injecting a nanoparticle-containing impregnating macromolecular polymer in which nanoparticles have been kneaded to impregnate the to-be-insulated object therewith,

wherein

the spraying step has a step of spraying microcapsules which contain the nanoparticles and are able to release the nanoparticles before the impregnation step.

2. The electrical insulating structure producing method according to claim 1 , wherein

the to-be-insulated object is a laminated conductor for stator windings of a rotating electrical machine,

the method further comprises, after the taping step and before the vacuum drawing step, an assembly step of incorporating the tape-wound laminated conductor into a stator to assemble a windings-incorporated object, and

the vacuum drawing step vacuums the windings-incorporated object to thereby vacuum the tape-wound to-be-insulated object to be insulated.

3. The electrical insulating structure producing method according to claim 1 , wherein

in the taping step, the main insulation tape is wound by a half-wrap method of overlapping each turn of the tape by half width of the tape.

4. The electrical insulating structure producing method according to claim 1 , wherein

the nanoparticles are at least one of silicon dioxide, aluminum oxide, magnesium oxide, and boron nitride.