Electric rotating machine having improved insulation for an armature coil

An electric rotating machine comprising:

• an armature core having slots formed at a plurality of locations on an outer periphery thereof;
• an armature coil including an upper and a lower coil layered in each of the slots, the upper coil having a part extending from each slot to be used as a commutator, each said part extending radially, adjacent and along an axial side surface of said armature core, from adjacent an outer circumferential corner of said armature core;
• a brush held in slidable contact with the commutator;
• a first insulating member disposed in each slot to insulate the upper coil from the armature core and the lower coil;
• and
• a second insulating member disposed in each slot to insulate the lower coil from the armature core,
• wherein the first insulating member has an insulating layer disposed between the upper coil and the lower coil and thicker than that of the second insulating member, and
• wherein the insulating layer is integrally formed with a remainder of the first insulating member and is in direct contact with said upper and lower coils.

An electric rotating machine comprising:

• an armature core having slots formed at a plurality of locations on an outer periphery thereof;
• an armature coil including an upper and a lower coil bar layered in each of the slots, the upper coil bar having an arm part extending from each slot as a commutator to be contacted with a brush, each said arm part extending radially, adjacent and along an axial side surface of said armature core, from adjacent an outer circumferential corner of said armature core;
• a first insulating member disposed in each slot and covering the upper coil bar to insulate the upper coil bar from the armature core and the lower coil bar;
• and
• a second insulating member disposed in each slot and covering the lower coil bar to insulate the lower coil bar from the armature core, wherein the first insulating member includes an insulating layer between the upper coil bar and the lower coil bar which has a larger heat resistance than that of the second insulating member, and
• wherein the insulating layer is integrally formed with a remainder of the first insulating member and is in direct contact with said upper and lower coils.

An electric rotating machine comprising:

• an armature core having slots formed at a plurality of locations on an outer periphery thereof;
• an armature coil including an upper and a lower coil bar layered in each of the slots, the lower coil bar having a first arm part extending from each slot along an axial side of the armature core and the upper coil bar having a second arm part extending from each slot along the axial side of the armature core to be used as a commutator, each said second arm part extending radially along said axial side surface of said armature core from adjacent an outer circumferential corner of said armature core;
• a brush disposed slidably on the second arm part for electric power supply to the armature coil;
• a first insulating layer disposed in each slot to insulate the upper coil bar from the armature core;
• a second insulating layer disposed in each slot to insulate the lower coil bar from the armature core;
• a third insulating layer disposed between the upper coil bar and the lower coil bar;
• first insulating means disposed between the first and the second coil arm parts to insulate the first arm part from the second arm part;
• and
• second insulating means disposed between the axial side of the armature core and the second arm part,
• wherein the third insulating layer has a higher heat resistance than the second insulating layer, and the first insulating means has a higher heat resistance than the second insulating means, and
• wherein the third insulating member is integrally formed with the first insulating member and is in direct contact with said upper and lower coils.

An electric rotating machine comprising:

• an armature core having slots formed at a plurality of locations on an outer periphery thereof;
• an armature coil including an upper and a lower coil trunk disposed in each of the slots, the upper coil trunk having a part extending from the slot as a commutator and in slidable contact with a brush, said part extending radially, adjacent and along an axial side surface of said armature core, from adjacent an outer circumferential corner of said armature core;
• an upper insulation surrounding the upper coil trunk to insulate the upper coil trunk from the armature core and the lower coil trunk;
• and
• a lower insulation which surrounds the lower coil trunk, except for an upper surface of the lower coil trunk which faces a bottom surface of the upper coil trunk, to insulate the lower coil trunk from the armature core,
• wherein the upper insulation is thicker than the lower insulation, and
• wherein the upper insulation includes a integral portion disposed between and is in direct contact with said upper and lower coil trunks.