| 摘要 |
The invention relates to a process for constricting a magnetic circuit formed by a stack of plates clamped on each side by slabs held by ties with threaded ends, each end receiving an associated clamping nut. According to the invention, the threaded end of a tie is coupled up to an associated traction jack resting against the slab, the prestress in the tie is relaxed until a predetermined elongation is obtained, a shim is inserted under the clamping nut, then the traction applied to the tie by the jack is released; these steps are repeated in succession for each slab, this being possible even when access to the ends of the ties is very limited, both axially and laterally. The implementing device essentially includes a traction jack 100 which can be associated with each individual tie and coupled up to a threaded end of the latter, and measuring means 300 associated with the two ends of the said tie for determining its respective elongation and the compression of the magnetic circuit. Application in particular to the constricting of the stator circuits of hydro-electric power station alternators. The method is of very special interest when there is little room to operate and/or when the nut is welded to the tie. <IMAGE>
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