| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a permanent magnet generator type igniter capable of surely preventing ignition of an engine when rotation of the engine is reversed regardless of a rotary position of a rotor. SOLUTION: AC voltage having positive-negative polarity is generated in a power generation coil 14 by rotating the rotor 11 of a permanent magnet generator 10. The rotor 11 has projections 12 and 13 separating in the rotational direction, and arranged on the outer periphery. The projection 13 is longer in the rotational directional length than the projection 12. When the rotor 11 normally rotates, a rotation sensor 20 detects the projections 12 and 13 in a range of positive voltage on output voltage of the power generation coil 14, and a detecting signal of the rotation sensor 20 becomes effective in an AND circuit 30. When the rotor 11 reversely rotates, the rotation sensor 20 detects the projections 12 and 13 in a range of negative voltage on the output voltage of the power generation coil 14. At this time, the detecting signal of the rotation sensor 20 is invalidated by the AND circuit 30.</p> |
