| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a low-cost and simple motor control apparatus with high detection precision, where a high-pass filter for extracting noise components is not necessary to be installed for detecting the motor current by an A/D converter, and it is not necessary to integrate the value detected by the A/D converter with an integrator and conversion speed of the A/D converter is not high, and to provide a vacuum cleaner and a hand dryer. <P>SOLUTION: The output of a current-detecting means 31 for measuring motor current is sampled by the A/D converter 33 for the prescribed number of times, for example, once, with a prescribed timing T1 from zero cross of commercial power voltage at each half cycle of commercial power so that the motor current value in a prescribed phase angle is measured, and will not extract only the noise component. Abnormality of sparks is decided from the size of the difference between a maximum value and a minimum value, within a prescribed time of the detection value of sampled current, so that a motor 2 is controlled. <P>COPYRIGHT: (C)2008,JPO&INPIT |
