Electrical insulating structure producing method, electrical insulating structure and rotating electrical machine
A producing method is for an electrical insulating structure to cover an outer surface of a to-be-insulated object. The method comprises: a tape production step of producing a main insulation tape by using a nanoparticle-containing joining macromolecular polymer; a taping step of winding a main insulation tape on outside of the to-be-insulated object to form a main insulated part; a vacuum drawing step, which is performed after the taping 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 impregnating macromolecular polymer to impregnate the main insulated part therewith.
1. An electrical insulating structure producing method that covers an outer surface of a to-be-insulated object, the method comprising:
a tape production step of producing a main insulation tape by using a nanoparticle-containing joining macromolecular polymer, the tape production step including a joining macromolecular polymer producing step and a bonding step, the joining macromolecular polymer producing step being mixing and kneading a joining macromolecular polymer and the nanoparticles to produce the nanoparticle-containing joining macromolecular polymer, and the bonding step being bonding a tape-shaped main insulating layer to a tape-shaped fiber-reinforcement part, by using the nanoparticle-containing joining macromolecular polymer to produce a main insulating tape containing the nanoparticles;
a taping step of winding a main insulation tape on outside of the to-be-insulated object to form a main insulated part;
a vacuum drawing step, which is performed after the taping 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 impregnating macromolecular polymer to impregnate the main insulated part therewith and to produce a macromolecular polymer part with the nanoparticle-containing joining macromolecular polymer, wherein
the bonding step includes
a step of setting a lower roller of a group of the lower roller and an upper roller with its lower part immersed in the nanoparticle-containing joining macromolecular polymer stored in a bonding agent container, and
a step of transferring the tape-shaped main insulating layer and the tape-shaped fiber-reinforcement part with tape-shaped main insulating layer and the upper roller contacting each other and with the tape-shaped fiber-reinforcement part and the lower roller contacting each other, thereby applying the nanoparticle-containing joining macromolecular polymer to the tape-shaped fiber-reinforcement part and bonding the tape-shaped main insulating layer and the tape-shaped fiber-reinforcement part.
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 hereby 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
in the impregnation step, the impregnating macromolecular polymer includes nanoparticles kneaded therewithin.
5. 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 nitrides.