| 摘要 |
<p>Disclosed herein is a method for determining a frequency of a power brush in a vacuum cleaner. According to the method of the present invention, a mechanical oscillation frequency (f2, f3) of a driving unit, which includes a brush body (34) reciprocated within a range of prescribed angles, and a torsion bar (36) for providing a prescribed elastic force to angular rotation of the brush body (34), is set equally to a driving frequency (f1) of a power supply unit (22), which drives the driving unit, or is set a prescribed percentage higher or lower than the driving frequency (f1) of the power supply unit, so that the driving unit can resonate. A large amount of movement is obtained using a small amount of power by means of the resonance.
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