| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deterioration of convenience due to an abnormal increase of a motor rotation number accompanied by a rise of a motor temperature, in an electric power tool having a motor in which a rotor is constituted of a permanent magnet.SOLUTION: When an execution condition of upper limit processing is not established, or when a motor rotation number does not reach an upper limit rotation number even if the execution condition is established, a motor is driven at a control amount (set dyty) which is set according to an operation amount of a trigger switch (S310 to S320). On the other hand, when the execution condition is established and the motor rotation number reaches the upper limit rotation number, the control amount is calculated so that the motor rotation number reaches a target rotation number, and the motor is driven at the calculated control amount (calculated dyty) (S330 to S350). |
