Rotating electrical machine and insulating tape
An insulating tape includes a base layer, two adhesive layers, and two reinforcing layers. The base layer has a first surface and a second surface opposite to the first surface. The two adhesive layers contain nano-sized silica particles, and each overlap a corresponding one of the first surface and the second surface. The two reinforcing layers are each provided for a corresponding one of the first surface and the second surface, and are bonded to the base layer by the adhesive layers.
1 . A rotating electrical machine comprising:
a stator;
a rotor rotatable with respect to the stator; and
a coil provided at least in the stator among the stator and the rotor, and including a conductor and an insulating tape covering the conductor,
wherein the insulating tape includes:
a base layer having a first surface and a second surface opposite to the first surface;
two adhesive layers containing nano-sized silica particles, and each overlapping a corresponding one of the first surface and the second surface; and
two reinforcing layers that are each provided for a corresponding one of the first surface and the second surface, and are bonded to the base layer by the adhesive layers, and
wherein each of the adhesive layers forms a continuous layer distinct from the reinforcing layers, and directly contacts the first surface or the second surface of the base layer, and
wherein the reinforcing layers overlap sides of the adhesive layers opposite to the base layer.
2 . The rotating electrical machine according to claim 1 , wherein
the insulating tape has portions overlapping each other, and
the coil includes a covering portion containing nano-sized mica particles, being interposed between the two portions overlapping each other, and covering the conductor.
3 . The rotating electrical machine according to claim 2 , wherein
the nano-sized mica particles are uniformly dispersed in the covering portion.
4 . The rotating electrical machine according to claim 2 , wherein
the nano-sized silica particles are contained only in the adhesive layers, and nano-sized mica particles are contained only in the covering portion.
5 . The rotating electrical machine according to claim 2 , wherein
the covering portion fills a space between overlapping portions of the insulating tape.
6 . The rotating electrical machine according to claim 1 , wherein
the adhesive layers are provided on both the first surface and the second surface so as to sandwich the base layer.
7 . The rotating electrical machine according to claim 1 , wherein
the nano-sized silica particles are configured to suppress electrical tree propagation along an interface between the base layer and the adhesive layers.
8 . The rotating electrical machine according to claim 1 , wherein
the insulating tape is wound in a half-wrap manner such that a spiral pitch is half a width of the insulating tape.
9 . The rotating electrical machine according to claim 1 , wherein
the insulating tape is wound in multiple layers.
10 . An insulating tape covering a conductor of a coil of a rotating electrical machine, the insulating tape comprising:
a base layer having a first surface and a second surface opposite to the first surface;
two adhesive layers containing nano-sized silica particles, and each overlapping a corresponding one of the first surface and the second surface; and
two reinforcing layers that are each provided on a corresponding one of the first surface and the second surface, and are bonded to the base layer by the adhesive layers, wherein
each of the adhesive layers forms a continuous layer distinct from the reinforcing layers, and directly contacts the first surface or the second surface of the base layer, and
the reinforcing layers overlap sides of the adhesive layers opposite to the base layer.