Stator including foaming adhesive and non-foaming adhesive

A stator comprising:

• a stator core having a slot;
• a winding wire to be inserted into the slot;
• and
• an insulation sheet interposed between the slot and the winding wire and configured to electrically insulate an inner wall of the slot and the winding wire, wherein
• the insulation sheet includes an insulation paper and adhesive layers, among two surfaces facing each other in the slot, a foaming adhesive that is thermally cured while foaming by heating is disposed on adhesive layers on front and back surfaces of the insulation paper on one surface, a non-foaming adhesive that has lower viscosity than that of the foaming adhesive when unheated and does not foam by heating is disposed on adhesive layers on front and back surfaces of the insulation paper on the other surface, and the non-foaming adhesive is thermally cured at a temperature higher than a temperature at which the foaming adhesive is thermally cured while foaming.

A stator comprising:

• a stator core having a slot;
• a winding wire to be inserted into the slot;
• and
• an insulation sheet interposed between the slot and the winding wire and configured to electrically insulate an inner wall of the slot and the winding wire, wherein
• the insulation sheet includes an insulation paper and adhesive layers, and includes a first insulation sheet in contact with one side surface of the inner wall of the slot, and a second insulation sheet in contact with the other side surface of the inner wall of the slot, in the inner wall of the slot, and
• a foaming adhesive that is thermally cured while foaming by heating is disposed on adhesive layers on front and back surfaces of an insulation paper of the first insulation sheet, a non-foaming adhesive that has lower viscosity than that of the foaming adhesive when unheated and does not foam by heating is disposed on adhesive layers on front and back surfaces of an insulation paper of the second insulation sheet, and the non-foaming adhesive is thermally cured at a temperature higher than a temperature at which the foaming adhesive is thermally cured while foaming.

A stator comprising:

• a stator core having a slot;
• a winding wire to be inserted into the slot;
• and
• an insulation sheet interposed between the slot and the winding wire and configured to electrically insulate an inner wall of the slot and the winding wire, wherein
• the insulation sheet includes an insulation paper, a first adhesive layer disposed on an entire front surface of the insulation paper facing the inner wall of the slot, and a second adhesive layer disposed on an entire back surface of the insulation paper facing the winding wire,
• a foaming adhesive that has viscosity to come into close contact with the inner wall of the slot when unheated and is thermally cured while foaming by heating is disposed on the first adhesive layer, and
• a non-foaming adhesive that has lower viscosity than that of the foaming adhesive when unheated so as not to come into close contact with the inner wall of the slot and does not foam by heating is disposed on the second adhesive layer, and the non-foaming adhesive is thermally cured at a temperature higher than a temperature at which the foaming adhesive is thermally cured while foaming.