| 摘要 |
PURPOSE:To prevent the generation of unnecessary voltage other than at the prescribed rotating angle for the subject generator by a method wherein the magnetic flux of the magnet, to be used for a pulser coil, is always flown to a pulser coil core and the pulser coil core is magnetically saturated. CONSTITUTION:The stepped cylindrical magnet retaining member 3 made of magnetic substance is engaged on the outer circumference of the boss section 2 on the rotor 1, two semicircular magnets 4A and 4B, having counter polarities adjacent to the small diameter section 3B of the magnet retaining member 3, are provided in ring shape and the core 8, whereon a pulser coil 9 was wound, is opposed to the magnets 4A and 4B and the large diameter section 3A of the magnet retaining member 3 respectively through an air gap. Then, the core 8 is placed under a magnetically saturated condition by having the magnetic flux of the magnets 4A and 4B to flow to the core 8 at all times and the generation of the unnecessary voltage other than the position of the rotor 1, where the polarity of the magnets 4A and 4B opposing to the core 8 changes, can be prevented. |
