Cooling device for rotary electric machine

Claim 1

In a cooling device for a rotary electric machine wherein a coil end portion of a stator of said rotary electric machine is provided with a ventilating guide which divides the stator coil end portion in the axial direction into a first ventilating section extending in the radial direction that causes cooling air to advance onto an inner peripheral side of the coil end portion and a second ventilating section extending in the radial direction that causes the cooling air, having passed through said first ventilating section, to advance onto an outer peripheral side of the coil end portion, and which guides the cooling air, having passed through said second ventilating section, into a space surrounding the stator, the improvement in said ventilation guide comprising a shroud covering the stator coil end portion from the outer peripheral side, and a partition member disposed on an inner peripheral side of said shroud and extending radially inwardly to divide a ventilation space into which said stator coil end portion extends into said first and second ventilation sections, said partition member being constructed of an electrically-insulating spacer ring of hardened, felt-like material interposed while pliable and hardened in position so as to extend in a circumferential direction between top coils and bottom coils of said stator coil end portion, and individual electrically-insulating spacers of hardened, felt-like material respectively interposed while pliable and hardened in position between the top coils and between the bottom coils in a manner to adjoin said spacer ring, said spacer ring and adjoining individual spacers closing up the interspaces between coils and forming said partition.