| 摘要 |
PURPOSE:To change wind noise or operation noise of a fan motor into a rhythmic sound by a method wherein magnet centers of a rotor and a stator are biassed into a vane direction at a time of stop, and the fan motor is continued to operate. CONSTITUTION:When a fan motor 1 is started, generated magnetic force and shaft propelling force by wind pressure of a vane 8 press a rotor 3 left-ward against a shaft receiving spring 7 of a bracket B, and operation of the fan motor 1 is continued with magnetic centers of a stator 2 and the rotor 3 coincided with each other. When the fan motor 1 stops, by return force of the shaft receiving spring 7, a rotor shaft 5 is pressed out rightward, and a tip end of the rotor shaft 5 hits a vibration plate 10 to produce vibrated sound. In this state, if the fan motor 1 is operated intermittently at a rate of prescribed times during a prescribed period, every time the operation of the fan motor 1 stops, the tip end of the rotor shaft 5 hits the vibration plate 10 and generates vibrated sound. Thus, rythmic vibrated sound can be generated repeatedly. |
