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发明授权
CN101590640B 充电式电动工具 有权

充电式电动工具
摘要：
提供一种不论设定速度怎样，均可切实地测出工具的非常规状态的充电式电动工具。根据由使用者设定的速度模式和触发开关的勾动量设定直流电机的DUTY(S140)，根据该DUTY设定用于检测工具的非常规状态的电压检测阈值(Vt)和锁定判定时间(Tr)(S150)。即，以DUTY越大，电压检测阈值(Vt)越低，锁定判定时间(Tr)为越短的时间的方式进行设定。与DUTY对应的直流电机的通电开始后(S160)，霍尔信号未被更新的状态是否经过锁定判定时间(Tr)(S190：是)，如果电池电压(Vb)低于电压检测阈值(Vt)(S220：是)，则判断为非常规状态并停止向直流电机的通电(S230、S250)。
摘要（英）：

A rechargeable power tool which can effectively measure abnormal state of the tool no matter what speed is set is provided. The DUTY (S140) of a direct current motor is set according to a speed mode and the hook momentum of a trigger switch set by a user, a voltage determination threshold (Vt) and a locking judgment time (Tr) are set according to the DUTY. That is, the bigger DUTY is, the lower voltage determination threshold (Vt)is, and the shorter mode of the locking judgment time (Tr) is set. After electrifying starting of the direct current corresponding to the DUTY, the state not been updated of Hall signals whether passing through the locking judgment time (Tr) or not (S190: yes), if the voltage of battery (Vb) is less than the voltage determination threshold (Vt) (S220: yes), then judging the abnormal state and stopping electrifying (S230, S250) to the direct current motor.

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