METHOD FOR CONTROLLING A SCREWDRIVER AND SCREWDRIVER
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Accused Products
Abstract
A method for controlling a screwdriver that has an electromotor, the electromotor having a clear ratio of rotational speed (n) to torque (M) at a defined effective voltage (Ueff soll), involving the following method step:—defining an effective voltage (Ueff sollfor operating the electromotor,—defining a cut-off rotational speed (nab) that corresponds to a pre-defined cut-off torque (Msoll) at the pre-defined effective voltage (Ueff soll,—operating the screwdriver under load with the pre-defined effective voltage (Ueff soll,—during operation of the screwdriver:—determining the rotational speed (n),—shutting down the electromotor when the cut-off rotational speed (nab) is attained.
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Citations
24 Claims
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1-12. -12. (canceled)
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13. A method for controlling a screwdriver having an electric motor, the electric motor having a distinct ratio of rotational speed to torque at a given effective voltage, the method comprising:
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predefining an effective voltage for the operation of the electric motor; predefining a cutoff rotational speed which corresponds to a predetermined cutoff torque at the predefined effective voltage; operating the screwdriver under load with the predefined effective voltage; during operation of the screwdriver; determining the rotational speed; and switching off the electric motor when reaching the cutoff rotational speed. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A screwdriver, comprises:
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an output portion and a drive portion having an electric motor, the electric motor having a distinct ratio of rotational speed to torque at a given effective voltage, and the drive portion having a control means for controlling the electric motor, an effective voltage driving the electric motor being adjustable by means of the control means, wherein a rotational speed detecting device detects the rotational speed of the electromotor during operation of the screwdriver, a cutoff rotational speed can be set by means of the control means, and the rotational speed detecting device transmits the detected rotational speed to the control means, with the control means switching off the electric motor when the cutoff rotational speed is reached. - View Dependent Claims (21, 22, 23, 24)
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Specification