Interphase insulating sheets with voids at annular portions for rotating electric machine, rotating electric machine, and electric compressor for vehicle

An interphase insulating sheet for a rotating electric machine, the rotating electric machine including an annular stator core, a first phase coil and a second phase coil different in phase from the first phase coil, the stator core including a plurality of slots in which the two phase coils are inserted by wave winding, each phase coil having a plurality of first coil ends extending out from a first axial end of the stator core and a plurality of second coil ends extending out from a second axial end of the stator core, the interphase insulating sheet comprising:

• a first annular portion for providing insulation between the first coil ends of the two phase coils;
• a second annular portion for providing insulation between the second coil ends of the two phase coils;
• and
• a plurality of bridge portions connecting the first annular portion to the second annular portion, the bridge portions being configured to be mounted to the slots, wherein
• at least one of the annular portions has a plurality of void portions extending from an inner peripheral surface to an outer peripheral surface of the annular portion,
• the void portions are arranged equidistantly in a circumferential direction,
• the void portions are arranged at portions corresponding to the bridge portions,
• the first phase coil arranged radially outward of the second phase coil,
• the void portions are arranged between at least one of the first and second coil ends of the first phase coil,
• each annular portion has a plurality of regions that connect adjacent bridge portions in a circumferential direction thereof,
• each of the bridge portions including a pair of extensions, provided between any two adjacent regions, and which are part of the first annular portion and the second annular portion, and
• the void portions being located in at least one of the extensions of each of the bridge portions.