| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent damaging of a motor by surely detecting a motor lock without adding any additional sensor or circuit. <P>SOLUTION: The rechargeable electric tool has an output part to which the rotation of a motor 11 is transmitted directly or via a decelerator and operates with a secondary battery as a power source. The rechargeable electric tool includes a voltage detection part 31 for detecting a battery voltage, a storage means 32 for storing a battery voltage when motor lock is measured beforehand, and a control means 30 for controlling driving of the motor. The control means 30 stops or decelerates the motor by determining that the rechargeable electric tool is in a motor lock state when a state where the battery voltage detected by the voltage detection part during motor driving is equal to or less than that stored in the storage part is continued for a prescribed time. <P>COPYRIGHT: (C)2012,JPO&INPIT |
