| 摘要 |
PCT No. PCT/FR83/00131 Sec. 371 Date Apr. 5, 1984 Sec. 102(e) Date Apr. 5, 1984 PCT Filed Jul. 1, 1983 PCT Pub. No. WO84/00843 PCT Pub. Date Mar. 1, 1984.A coil including a closed magnetic circuit (1), constituted by metal sheets which are stamped and stacked, so as to form a first part (12) which is U-shaped, of which one of the portions (12a) is stamped with a chamfered edge (12b), a second part (13), which is L-shaped, has a portion (13a) stamped with a chamfered edge (13b) such that after an insulating housing (6) containing the primary (4) and secondary (5) windings has been located on the arm (8) and a permanent magnet (2) has been inserted between the chamfers (12b and 13b) the first and second parts (12 and 13) are made rigid, by means of rivets (14, 15) and extensions (9b) of the metal plates (9) constituting a shunt circuit for magnetic flux created by the primary winding (4).
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