| 摘要 |
PURPOSE: A braking method of a washing motor is provided to prevent breakage of a washing motor driving unit by reducing reverse electromotive force from phase difference with detecting the braking resistance in stopping the washing motor. CONSTITUTION: Reverse electromotive force is generated from a washing motor in braking, and compared with the predetermined voltage(S11,S12). Normal braking is performed by the braking resistance if the reverse electromotive force is over the predetermined voltage(S13), and time for transmitting current through the braking resistance is compared with the reference time(S14,S15). Dynamic braking is performed to prevent breakage of a washing motor driving unit in detecting open or short circuit of the braking resistance(S16), and reverse electromotive force is reduced below the predetermined voltage by braking. Dynamic braking is stopped, and the washing motor is stopped in decreasing the reverse electromotive force below the predetermined voltage(S17,S18). |
