| 摘要 |
1. Process for obtaining a coil with a closed magnetic circuit and with a permanent magnet for the ignition of internal-combustion engines, the coil comprising a primary winding (1) and a secondary winding (2) surrounding a branch (4b) of the magnetic circuit (3) which consists of sheet-metal strips (4) of different lengths, stacked on one another and folded so as to form a magnetic circuit, in which is arranged a permanent magnet (5), the largest surfaces (S1) of which are greater than the cross-section (S2) of the said circuit which incorporates a metal fastening flange (6) and a half-shell (8) enclosing the magnetic circuit over half its thickness, the flange (6) serving as a shunt circuit for the flux generated by the primary winding (1), characterised in that the magnetic circuit consisting of a single stack of strips (4) is shaped by means of folding, so as to close it on the surfaces (S1) of the permanent magnet (5), after the windings (1 and 2) have been fitted on the branch (4b) round which they are arranged.
|
