wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing

Full Title

Arrangements for cooling or ventilating (channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24) > wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle > wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing