Insulated electrical cable
An insulated electrical cable includes: a conductor; and an insulating layer that is laminated on an outer peripheral surface of the conductor and includes a polyimide as a main component, wherein the insulating layer includes a plurality of pores, and wherein a porosity of the insulating layer is greater than or equal to 25% by volume and less than or equal to 60% by volume.
1. An insulated electrical cable comprising:
a conductor; and
an insulating layer that is laminated on an outer peripheral surface the conductor and includes a polyimide as a main component,
wherein the insulating layer includes a plurality of pores,
wherein a porosity of the insulating layer is greater than or equal to 25% by volume and less than or equal to 60% by volume, and
wherein a coefficient of variation or the pores is less than or equal to 30%.
2. The insulated electrical cable according to claim 1 , wherein a tensile stress at a time of 10% extension of the insulating layer is less than or equal to 100 MPa.
3. The insulated electrical cable according to claim 1 , wherein an average thickness of the insulating layer is greater than or equal to 10 μm.
4. The insulated electrical cable according to claim 1 , wherein the polyimide is a condensation polymer of an aromatic tetracarboxylic dianhydride and an aromatic diamine.
5. The insulated electrical cable according to claim 1 , further comprising a primer layer between the conductor and the insulating layer.
6. The insulated electrical cable according to claim 1 , wherein the insulating layer includes a plurality of pores and an outer shell at a peripheral portion of the pores.