| 摘要 |
Providing an electric tool that can reliably detect the occurrence of the motor-lock and can prevent the damage of the motor without adding a sensor and/or a circuit. The electric tool is powered by a secondary battery as a power source, and includes: an output section configured to be transmitted thereto a rotation of a motor 11 directly or through a decelerator; a voltage measurement section 31 that measures a battery voltage; a storage means 32 that stores, as a reference voltage, a voltage value of the battery voltage measured preliminarily when a motor-lock is occurring; and a control means 30 that controls a driving of the motor. The control means 30 is configured to decide that the motor 11 is being locked and then stop or decelerate the motor 11 upon detecting that the battery voltage measured through the voltage measurement section 31 is maintained lower than or equal to the reference voltage stored in the storage means 32 for a predetermined period of time during the driving of the motor. |
