| 摘要 |
PURPOSE:To suppress the irregular rotation of a motor and eliminate buzzing sounds by calculating a difference between a rotational frequency stored in a memory section and a rotational frequency detected by a rotation sensor to judge the tendency to increase or decrease the rotational frequency and adjust the phase of a power source supplied to a motor on the basis of the result of the judgement for controlling the rotational frequency. CONSTITUTION:A motor 5 for washing and hydro-extraction, a rotation sensor 17 for detecting the rotational frequency of the motor 5 and phase control section 33 for adjusting the power source phase of the motor 5 on the basis of the output of the rotation sensor 17 to control the rotational frequency of the motor 5 are provided so that the power source phase supplied to the motor 5 is controlled to control the rotational frequency of the motor 5. Thus, the irregular rotation of the motor is suppressed so that a user will not hear buzzing sounds. |
