PROTECTION SYSTEM AND RELATIVE OPERATING METHOD IN A PORTABLE CUTTING TOOL

An active protection system and method in a portable cutting tool with movable cutting members is disclosed， comprising at least - stopping means of said cutting members， - a control and processing unit apt to trigger said stopping means upon the detection of a danger condition， - a proximal electrode electrically coupled with a handle of said tool and a distal electrode electrically coupled with said cutting member， apt to make up an armature of a capacitor， said processing unit feeding an electric output signal into one of said electrodes and detecting an electric input signal on the other electrode， wherein said electric output signal comprises at least two different frequencies， a detection unit is also provided which detects a complex impedance of said electric input signal at said different frequencies， and said processing unit determines a danger condition and causes triggering of said stopping means based on a value of the magnitude of said complex impedance electric signal and on a phase difference of said impedance electric signal at said different frequencies.

本公开提供了一种配备可动切削部件的便携式切削工具的主动保护系统及方法，该系统及方法至少包括：所述切削部件的制动装置；用于在检测到危险状态时触发所述制动装置的控制与处理单元；以及与所述工具手柄电连接的近端电极和与所述切削部件电连接的远端电极，二者构成电容器的两个极板。所述处理单元向其中一个电极输入电输出信号，并在另一电极上检测电输入信号，其中所述电输出信号至少包含两种不同频率。此外还设有检测单元，用于检测所述电输入信号在各不同频率下的复阻抗；所述处理单元则基于所述复阻抗电信号的幅值，以及不同频率下所述阻抗电信号的相位差，判定危险状态并触发所述制动装置。