| 摘要 |
PURPOSE:To prevent a pulse generator sensor against malfunction with the lowered quantity of all the flux of driving flux minimized, by performing the magnetization for frequency generator while biasing N poles or S poles. CONSTITUTION:To magnetize a driving magnet 4, driving magnetization is performed at first within the range of X. Then, biasing a magnet 7 for pulse generator on outside circumference so as to reduce the polarity in accordance with the polarity of a pulse generator sensor 6, magnetization is performed for frequency generator to N poles or S poles. By performing such magnetization, the flux quantity of magnetization detected by the pulse generator sensor 6 becomes so lower than the malfunction producing level that no flux quantity will produce malfunction where it exceeds the level, by the leakage flux of the driving magnetization. The total flux of the driving flux is more or less reduced than at the time when no magnetization for frequency generator is performed. It can be minimized and no torque is reduced.
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