| 摘要 |
<p>A permanent-magnet voltage generator for supplying voltage to the ignition system of an internal-combustion engine. The voltage generator comprises a rotor unit (10) provided with an air fan (14) and a stator core (11) having at least one voltage generating coil (28') facing the rotor unit (10). The rotor unit (10) comprises a magnetically conductive bar element (12) diametrically extending and provided with a central hub (15) for connection to the shaft of the engine. The bar element (12) comprises a permanent magnet (21) arranged between between a pair of pole shoes (17,18) longitudinally extending on one side of the hub (15), and a balancing portion (25,see Fig.4) longitudinally extending on the opposite side of the bar (12). The two pole shoes (17,18) and the body portion of the bar element (12) on one side of the hub (15) define on a side a first open magnetic circuit facing the magnetic circuit of the stator which is fed with a portion (F1,see Fig.4) of the magnetic flux to generate the voltage in the stator coil (28'), and a second closed magnetic circuit (F2,see Fig.4), on the other side, supplied under saturation conditions with the remaining portion of the permanent magnet flux. <IMAGE></p> |
