초록 ▼

An electrical machine, such as an electric motor, dynamo or alternator has a casing (26) with cooling vents (64) enabling cooling fluid (F) to flow into and out of the casing when the rotor (10) of the electrical machine rotates. The rotor (10) may be formed from conductive elements (44) connected t

An electrical machine, such as an electric motor, dynamo or alternator has a casing (26) with cooling vents (64) enabling cooling fluid (F) to flow into and out of the casing when the rotor (10) of the electrical machine rotates. The rotor (10) may be formed from conductive elements (44) connected together at their outer regions by inter-connecting members (40) which have vanes (68, 70) arranged to direct cooling fluid over the outer regions. Each conductive element (44) is a metal strip (45) with legs (46, 48) bent in opposite directions (D.sub.1, D.sub.2) relative to the plane of the strip. Portions of the windings (28, 30) of the rotor (10) are spaced apart to allow fluid to flow between the windings to enhance the cooling effect. With a current carrying rotor, the magnetic field intensity across the rotor is varied by varying the axial separation of the rotor and the stator (74, 76).

대표청구항 ▼

[ I claim:] [1.] A casing for an electrical machine having a rotor, said casing having first and second sets of cooling vents enabling cooling fluid to flow respectively into and out of said casing when said rotor rotates, the first and second sets of vents being disposed in a radially outer portion

[ I claim:] [1.] A casing for an electrical machine having a rotor, said casing having first and second sets of cooling vents enabling cooling fluid to flow respectively into and out of said casing when said rotor rotates, the first and second sets of vents being disposed in a radially outer portion of the casing and being arranged to direct cooling fluid tangentially into and out of, respectively, said casing.