| 摘要 |
PROBLEM TO BE SOLVED: To provide a power tool of such type that an oil pressure generating part hits a plurality of times during its one revolution and to provide its motor control method for preventing improper hitting from being continued. SOLUTION: This motor control method for the power tool comprises a step 104 for determining whether a hitting angle is below a threshold value or not, a step 106 for detecting consumption current of a motor if the hitting angle is below the threshold value, a step 108 for determining whether the consumption current is below a threshold value or not, and a step 110 for reducing rotational speed of the motor if the consumption current is below the threshold value. That is, since improper hitting is determined based on the hitting angle of the oil pressure generating part during one hitting and load current having proportional relationship with load torque of the motor and rotational speed of the motor is reduced in case of the improper hitting, it is possible to prevent the improper hitting from being continued. As a result, since the improper hitting is prevented, work efficiency is improved, tightening work can be smoothly performed, and ease of use of an oil pulse driver is improved. COPYRIGHT: (C)2011,JPO&INPIT |
