| 摘要 |
<p>PURPOSE:To increase the quantity of stored magnetic energy, and to improve the efficiency of ignition coil by a method wherein the number of turns per unit length of the primary coil of the part close to a permanent magnet is relatively made larger than the number of turns per unit length of the part on the further side from the permanent magnet. CONSTITUTION:The primary coil 2, to be wound around the outer circumference of a first core 5, is closely wound in such a manner that the number of turns per unit length becomes larger on both side plates of the first core 5 which is located close to permanent magnets 7 and 8, and the coil 2 is coarsely wound in such a manner that the number of turns per unit length becomes smaller on the center part of the first core 5 which is located further from the permanent magnets 7 and 8. As above-mentioned, by changing the number of turns of the primary coil 2 per unit length in proportion to the amount of inverted bias by the permanent magnets 7 and 8, the efficiency of ignition coil 1 is improved by increasing the quantity of accumulation of magnetic energy when compared with the case where the primary coil 2 is uniformly wound. Also, the deterioration of reliability can be prevented by suppressing the generation of heat on the unnecessary winding, thus obtaining a slim ignition coil.</p> |
