| 摘要 |
PURPOSE:To prevent generation of irregular noise by furnishing a high impedance circuit instead of turning on the lowest speed notch and by turning on this high impedance circuit for a short while immediately before or after turning-on or -off of the speed change notch. CONSTITUTION:When current supply is started or stopped for a fan motor FM, a circuit with higher impedance than the lowest speed notch N3 is used instead of applying current to the notch N3, where this impedance circuit is turned on for a short time immediately before or after turning-on or -off of the speed change notch. Thereby generation of irregular noise likely when current supply to the fan motor FM is started or shut off can be prevented, that will contribute to reduction of disagreeable sense to users. |
