| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an air blower and a heating cooker including the same, capable of properly detecting contamination of an impeller of the air blower and preventively performing maintenance before the contamination of blades progresses. <P>SOLUTION: A threshold value of a rotational frequency of an exhaust motor 15b is memorized in a ROM 72 in advance corresponding to a plurality of voltages for driving the exhaust motor 15b, that is, different duty ratios in PWM control, and alert for prompting cleaning of the impeller is performed on a display unit 5, when the rotational frequency detected corresponding to each duty ratio from a pulse generated by a rotation sensor 15c is smaller than the threshold value of the rotational frequency memorized in the ROM 72, in a case of increasing the duty ratio of the PWM control by 10% every 2 seconds in driving the exhaust motor 15b. Further when the increase of the rotational frequency detected in changing the duty ratio in the PWM control by 10%, is smaller than a threshold value of the increase memorized in the ROM 72 in advance, a warning indicating locking of the impeller is made from the display unit 5. <P>COPYRIGHT: (C)2011,JPO&INPIT |
