| 摘要 |
PURPOSE:To make it possible to obtain the sufficient output and the accurate ignition signal in a simple constitution by providing the relative length to the magnetic pole length of the rotor and by providing two pieces of signal coil both of which are connected cumulatively or differentially. CONSTITUTION:On the inside circumference of a flywheel 1 magnets 2 having more than six poles are provided, e.g. magnets magnetized at eight N and S poles alternately. A magnet 2a, one of these magnets, is more than 360 deg./P in magnetizing length at N pole and less than 360 deg./P in magnetizing length at S pole, the sum being (2X360 deg.)/P (P: the number of magnetized poles of a magnet). On the other hand, to a stator 3 provided are poles 5 and 5a of signal coils 4 and 4a, a pole 7 of an ignition source coil 6 and a pole 9 of a generating coil 8. In this case, the space between the poles 5 and 5a is to be nX360 deg./P (provided that n is an integer), while the signal coils 4 and 4a is connected cumulatively and differentially. Thus, the output increase can be achieved without making the unit large-sized, and that without regard to the number of poles one time firing or twice per rotation can be secured.
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