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    • 2. 发明授权
    • Device and method for taking a safety precaution in an electrical tool
    • 在电动工具中采取安全预防措施的装置和方法
    • US08786220B2
    • 2014-07-22
    • US12810639
    • 2008-10-31
    • Ulrich SingleMichael Habele
    • Ulrich SingleMichael Habele
    • H02P1/24
    • H02H7/0854B25F5/00
    • The invention relates to a device (10) for taking a safety precaution in an electrical tool, said electrical tool comprising an electric motor (EM) with at least one field winding and an armature winding. The device (10) comprises the following features: a sensor unit (12) which is designed to generate a sensor signal (21) in accordance with a motor current (14) passing through the electric motor (EM), an armature voltage (16) via the armature winding, a voltage (18) via the field winding and/or a commutation frequency (20) in the armature winding; a unit (22) detecting a change of the sensor signal, which is designed to detect a temporal change of the sensor signal (21) and emit a corresponding modification signal (24) on the basis of the detected change; and a safety device (26) which is designed to take a safety precaution (28) in the electrical tool when a value of the modification signal (24) is exceeded or not met in relation to a threshold value.
    • 本发明涉及一种用于在电动工具中采取安全预防措施的装置(10),所述电动工具包括具有至少一个励磁绕组和电枢绕组的电动机(EM)。 装置(10)包括以下特征:传感器单元(12),其被设计成根据通过电动机(EM)的电机电流(14)产生传感器信号(21),电枢电压(16 )经由所述电枢绕组,经由所述励磁绕组的电压(18)和/或所述电枢绕组中的换向频率(20); 检测传感器信号的变化的单元(22),其被设计为基于检测到的变化来检测传感器信号(21)的时间变化并发出相应的修改信号(24); 以及安全装置(26),其被设计为当相对于阈值超过或不满足修改信号(24)的值时,在电动工具中采取安全预防措施(28)。