GB857471A - Improvements relating to dynamo electric machines - Google Patents

Abstract

857,471. Dynamo electric machines. ENGLISH ELECTRIC CO. Ltd. Dec. 11, 1957 [Dec. 19, 1956], No. 38746/56. Class 35. In a dynamo-electric machine of such size and nature that in operation cyclic distortion is set up in its laminated stator core 10 such core 10 is mounted in a footless frame in turn mounted directly, i.e. not through an outer frame, on supporting foot members through resilient support means which are sufficiently rigid and resilient in respective vertical and transverse radial directions of the machine to support the stator core and absorb the core vibrations due to the cyclic distortion. As shown applied to a two-pole turbo alternator, the frame consists of axially spaced rings 11 welded to axially extending core studs 12 and spacing ribs 13, and the support means comprise struts 16 secured to the rings 11 and to brackets 24 of sole plates 25 through axially extending tubes or bars 22, 23, which twist in response to the vibrations. The struts are rigid and comprise oppositely threaded studs 17, 18 connected together by screw shackles 19 and to the bars 22, 23 by trunnions 20, 21; they carry the vertical load and part of the torque reaction the remainder of which is carried by horizontal struts 28 similarly secured to the frame and to anchor members 31. Adjustment of shackles 19 permits centring of the stator core with respect to the rotor 33 whose bearing brackets 40 are bolted directly to foundations 15. A cylindrical housing 37 at least partly evacuated or filled with a lowdensity gas extends through the machine air gap and is secured via annular expansion joints 38 and members 39 to the brackets 40. The stator windings 34 are direct cooled via manifolds such as 35.