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    • 5. 发明公开
    • KRAFTSCHRAUBER
    • 动力扳手
    • EP2146822A2
    • 2010-01-27
    • EP08757966.0
    • 2008-04-23
    • Lösomat Schraubtechnik Neef GmbH
    • GAREIS, Marc
    • B25B23/147B23P19/06
    • B25B23/147
    • The invention relates to a power screwdriver (10) comprising a motor (12) as the drive, a desired torque default element (52) and an actual torque determination element (46), a torque gradient determination element (48) and a motor control (40) which controls the motor (12) depending on the torque gradient (dmd_lst/dt). The invention is characterized by a torque threshold determination element (50) which provides a torque threshold value (Md_Lim, Md_Lim1, Md_Lim2) that depends on the torque gradient (dmd_lst/dt) and lies below the desired torque value (Md_Soll). If the actual torque value (md_Ist) exceeds the torque threshold value (Md_Lim, Md_Lim1, Md_Lim2), a motor control (40) presets a speed reduction for the motor (12) or already completely switches off the motor (12). The power screwdriver (10) according to the invention avoids torque overshoots and yet allows the desired torque value (Md_Soll) to be exactly reached in the shortest time possible.
    • 6. 发明公开
    • KRAFTSCHRAUBER
    • EP2139645A2
    • 2010-01-06
    • EP08757968.6
    • 2008-04-21
    • Lösomat Schraubtechnik Neef GmbH
    • GAREIS, Marc
    • B25B23/147B25B21/00H02H9/04
    • B25B21/00B25B23/0078B25B23/147
    • The invention relates to a power screwdriver (10) comprising a motor (12) and a control circuit (22) which switches the motor (12) off by means of a switch-off signal (s_Stop) when it reaches a preset desired torque value (Md_Soll), and a supporting arm (18) which absorbs energy during screwing. The invention is characterized by a voltage limiting circuit (46) that limits the motor voltage (u_Mot) occurring on the motor (12) when the energy stored in the supporting arm (18) of the motor (12), which is driven as the generator and rotates counter to the direction of drive, is dissipated, to a predetermined limiting voltage (u_Lim). Said limiting voltage (u_Lim) is fixed in such a manner that the motor (12) is capable of rotating without counter-torque counter to the direction of drive when operated in the generator mode and that yet no inadmissible overvoltages occur.
    • 本发明涉及一种电动螺丝刀(10),其包括马达(12)和控制电路(22),当达到预设的期望扭矩值时,所述控制电路通过断开信号(s_Stop)断开马达 (Md_Soll)以及在拧紧过程中吸收能量的支撑臂(18)。 本发明的特征在于当存储在马达(12)的支撑臂(18)中的能量被限制时,限制在马达(12)上发生的马达电压(u_Mot)的电压限制电路(46) 发电机并且逆着驱动方向旋转,被消耗到预定的限制电压(u_Lim)。 所述限制电压(u_Lim)以这样的方式固定,使得电动机(12)在发电机模式下运行时能够在没有与驱动方向相反的反扭矩的情况下旋转,并且不会发生不允许的过电压。
    • 10. 发明授权
    • KRAFTSCHRAUBER
    • 动力扳手
    • EP2146822B1
    • 2012-08-01
    • EP08757966.0
    • 2008-04-23
    • Lösomat Schraubtechnik Neef GmbH
    • GAREIS, Marc
    • B25B23/147B23P19/06
    • B25B23/147
    • The invention relates to a power screwdriver (10) comprising a motor (12) as the drive, a desired torque default element (52) and an actual torque determination element (46), a torque gradient determination element (48) and a motor control (40) which controls the motor (12) depending on the torque gradient (dmd_lst/dt). The invention is characterized by a torque threshold determination element (50) which provides a torque threshold value (Md_Lim, Md_Lim1, Md_Lim2) that depends on the torque gradient (dmd_lst/dt) and lies below the desired torque value (Md_Soll). If the actual torque value (md_Ist) exceeds the torque threshold value (Md_Lim, Md_Lim1, Md_Lim2), a motor control (40) presets a speed reduction for the motor (12) or already completely switches off the motor (12). The power screwdriver (10) according to the invention avoids torque overshoots and yet allows the desired torque value (Md_Soll) to be exactly reached in the shortest time possible.