| 摘要 |
1,127,017. Dynamo-electric machines, &c. CLARKE, CHAPMAN & CO. Ltd. 1 Dec., 1965 [10 Dec., 1964], No. 50318/64 Heading H2A. A rotor for a high-speed A.C. generator comprises three parts, all of high-strength low reluctance ferrous alloy, the main part consisting of a cylindrical section with at least one, preferably two, (like) poles extending radially outwardly from the middle of its length, and the two other parts each consisting of a sleeve located about the first part and having recesses to accommodate one half of each pole. The unrecessed portions of the sleeves meet and are joined at the mid-point of the length of the main part to form the opposite poles, but a gap is left all around the periphery of each main part pole, this gap being continuous with an annular gap between the sleeves and the main part. This gap is filled with brass, phosphor bronze, or stainless steel of low permeability to function as a damping winding and to form a bond between the parts. Beyond the sleeves the main part has cylindrical or frusto-conical portions ending in bearing trunnions. In the alternator,the complete rotor is surrounded, at the middle, by a wound stator ; the sleeve ends, which are tapered, are closely surrounded by tapered extensions of the inner walls of excitation coil casings, these tapered extensions being directed axially inwards; and the ends of the abovementioned " main part " are surrounded by extensions of outer walls of the excitation coil casings. The purpose of the rotor construction is to provide strength at speeds of the order of 30,000 r.p.m. |
