Dynamoelectric coil portion insulating construction
View Patent ↗A stator coil 24 is installed in a stator core 11 , and an insulating resin is impregnated into slot portions 22 and hardened. The stator coil 24 is constituted by enameled wires in which a polyamideimide resin layer has been applied radially outside a copper wire and hardened, and the insulating resin contains as a major component a THEIC-modified polyester resin that has been modified by a fatty acid.
1. A dynamoelectric coil portion insulating construction for a dynamoelectric machine in which a coil portion that is formed by winding a coil onto a core is impregnated with an insulating resin, wherein:
said coil is an enameled wire that is covered by an enamel coating in which an uppermost layer is a polyamideimide resin layer; and
said insulating resin is a THEIC-modified polyester resin that has been modified by an oil component.
2. A dynamoelectric coil portion insulating construction according to claim 1 , wherein said oil component is a fatty acid that has an unsaturated bond.
3. A dynamoelectric coil portion insulating construction according to claim 1 , wherein said oil component is oleic acid.
4. A dynamoelectric coil portion insulating construction according to claim 1 , wherein modification of said THEIC-modified polyester resin by said oil component is greater than or equal to 20 percent and less than 40 percent.
5. A dynamoelectric coil portion insulating construction according to claim 1 , wherein an acrylic monomer is added to said insulating resin.
6. A dynamoelectric coil portion insulating construction according to claim 1 , wherein said enamel coating includes a polyesterimide resin layer in a lower layer.
7. A dynamoelectric coil portion insulating construction according to claim 6 , wherein said enamel coating is configured so as to have a two-layer construction that includes said polyamideimide resin layer and said polyesterimide resin layer.
8. A dynamoelectric coil portion insulating construction according to claim 6 , wherein said polyamideimide resin layer is formed so as to have a thickness that is greater than or equal to 30 percent of a total thickness of said enamel coating.
9. A dynamoelectric coil portion insulating construction according to claim 1 , wherein said coil is a stator coil, and said core is a stator core.
10. A dynamoelectric coil portion insulating construction according to claim 9 , wherein said dynamoelectric machine is an automotive alternator.
11. A dynamoelectric coil portion insulating construction according to claim 1 , wherein said coil is a field coil, and said core is a rotor core.
12. A dynamoelectric coil portion insulating construction according to claim 11 , wherein said dynamoelectric machine is an automotive alternator.