H - Electricity – 01 – F
Patent
H - Electricity
01
F
26/119, 336/65
H01F 5/00 (2006.01) H01F 27/30 (2006.01) H01F 41/04 (2006.01)
Patent
CA 1253588
- 14 - Abstract A coil for electrical devices has at least one axially formed winding (1). The end surfaces of the coil are braced against one another in the axial direction by means of a preloading device containing a loop (2). This loop (2) is intended to be pushed onto retention devices of the preloading device and supported on these retention devices so as to be free from shear. The loops (2) are wound in several layers from elastic insulation strip impregnated with hardening synthetic resin and are hardened in a definite shape. They are held without shear in loop retention devices (6a ... 6d, 6a' ... 6d') of the preloading device and they reliably maintain the preloading for all operational cases. A cost effective method for manufacturing this coil includes the coil being subjected to the final preloading only after winding, fixing by means of temporary strips, impregnation with casting resin and hardening of the casting resin. The final preloading is at least 0.5% of the clamping length of the loops (2).
495915
Limited Bbc Brown Boveri & Company
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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