Patent ID: 8421285

Claim:
A permanent magnet type generator in which a stator and a rotor burying permanent magnets are accommodated in a housing, comprising: a heat exchanger that is arranged at the outer circumferential side of the stator, wherein the heat exchanger causes outer air to flow and cools cooling wind by circulating the cooling wind in the housing, wherein the heat exchanger cools the cooling wind by exchanging heat between the outer air introduced from the outer air inlet side of the heat exchanger and the cooling wind, returns the cooling wind into the housing, and exhausts the outer air heat-exchanged with the cooling wind from he outer air exhaust side of the heat exchanger, wherein the cooled cooling wind is ventilated to and cools the rotor and the stator, and wherein the heat exchanger is constituted in such a manner that the temperature in an axial direction of the stator becomes higher at a region facing the outer air exhaust side of the heat exchanger than at the outer air inlet side of the heat exchanger; and an air quantity increasing means for increasing the air quantity of the cooling wind that is circulated via the heat exchanger and is flowed from the inner diameter side of the rotor to the outer diameter side thereof is disposed at a region facing the outer air exhaust side in the heat exchanger where the temperature rise in the stator maximizes.