| 摘要 |
The screw driver has a drive (12) including electric motor (14) connected to drive shaft (20) for driving a tool (22), and current sensor (38) to detect motor current. A control unit (36) calculates threshold value for motor current by transferring the electric motor to waiting state, based on preset torque. The motor current is monitored, and the brake criterion is determined based on preset torque, when monitored motor current exceeds threshold value. The drive is decelerated when brake criterion is satisfied and the motor is not energized during brake operation of drive. An independent claim is included for a method for controlling screw driver. |
