Stator coil, method of manufacturing the same, and rotating electric machine
Provided is a stator coil, including: a coil conductor; a first insulating layer in which a first mica tape is wound and laminated around an outer periphery of the coil conductor; and a second insulating layer in which a second mica tape is wound and laminated around an outer periphery of the first insulating layer, wherein the first mica tape contains mica in a specific content, wherein 60 mass % or more of the mica contained in the first mica tape passes through a JIS standard sieve having a nominal opening of 250 μm, wherein the first mica tape has a specific lamination thickness, and wherein 40 mass % or less of mica contained in the second mica tape passes through the JIS standard sieve having a nominal opening of 250 μm.
1. A stator coil, comprising:
a coil conductor;
a first insulating layer in which a first mica tape is wound and laminated around an outer periphery of the coil conductor; and
a second insulating layer in which a second mica tape is wound and lair inated around an outer periphery of the first insulating layer,
wherein the first mica tape contains mica particles in a content of 30 g or more and 100 or less per 1 m 2 of the mica tape,
wherein 60 mass % or more of the mica particles contained in the first mica tape pass through a JIS standard sieve having a nominal opening of 250 μm,
wherein the first mica tape has a lamination thickness of 0.1 mm or more and 1 mm or less, and
wherein 40 mass % or less of mica particles contained in the second mica tape pass through the HS standard sieve having a nominal opening of 250 μm.
2. The stator coil according to claim 1 , wherein the coil conductor has a rectangular shape in cross-section.
3. A rotating electric machine, comprising the stator coil of claim 1 accommodated in a slot of a stator core.
4. The stator coil according to claim 1 , wherein:
the JIS standard is JIS Z8801-1 (2006).
5. A method of manufacturing a stator coil, comprising the steps of:
winding and laminating a first mica tape around an outer periphery of a coil conductor so that the laminated first mica tape has a thickness of 0.1 mm or more and 1 mm or less;
winding and laminating a second mica tape around an outer periphery of the laminated first mica tape;
impregnating a liquid thermosetting resin composition into the coil conductor having the first mica tape and the second mica tape wound therearound; and
curing the liquid thermosetting resin composition by heating,
wherein the first mica tape contains mica particles in a content of 30 g or more and 100 g or less per 1 m 2 of the mica tape,
wherein 60 mass % or more of the mica particles contained in the first mica tape pass through a JIS standard sieve having a nominal opening of 250 μm, and
wherein 40 mass % or less of mica particles contained in the second mica tape pass through the JIS standard sieve having a nominal opening of 250 μm.
6. The method according to claim 5 , wherein:
the JIS standard is JIS Z8801-1 (2006).