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    • 3. 发明申请
    • ELECTRIC TOOL
    • 电动工具
    • WO2013137480A3
    • 2014-04-10
    • PCT/JP2013058176
    • 2013-03-13
    • HITACHI KOKI KK
    • TAKANO NOBUHIROHARADA TETSUHIROIIMURA YOSHIONISHIKAWA TOMOMASAUCHIDA HIROKINAKANO YOSHIHIRO
    • H02P3/00H02P7/00H02P27/08H02P29/00H02P29/02
    • H02P6/08B25B21/02B25F5/00B25F5/008H02P27/08H02P29/0241H02P29/60H02P29/68
    • An electric tool for driving a tip tool, the electric tool includes: a removable battery; the brushless motor configured to generate a driving force for driving the tip tool; an inverter circuit configured to supply drive power from the removable battery to the brushless motor using a plurality of semiconductor switching elements; a controller configured to control the inverter circuit to control rotation of the brushless motor; a temperature detector configured to detect a temperature of the brushless motor or the semiconductor switching elements; and a voltage detector configured to detect a voltage of the battery. The brushless motor is driven such that a duty ratio of PWM drive signal for driving the semiconductor switching elements is determined based on relationship between the temperature detected by the temperature detector and the voltage detected by the voltage detector.
    • 一种用于驱动尖端工具的电动工具,电动工具包括:可拆卸电池; 所述无刷电动机构造成产生用于驱动所述尖端工具的驱动力; 逆变器电路,被配置为使用多个半导体开关元件将可移除电池的驱动电力提供给无刷电动机; 控制器,被配置为控制所述逆变器电路以控制所述无刷电动机的旋转; 温度检测器,被配置为检测所述无刷电动机或所述半导体开关元件的温度; 以及电压检测器,被配置为检测电池的电压。 基于由温度检测器检测的温度与由电压检测器检测到的电压之间的关系来确定用于驱动半导体开关元件的PWM驱动信号的占空比来确定无刷电动机。