EP1186383A2 - Electric hand tool with safety coupling - Google Patents

Electric hand tool with safety coupling Download PDF

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Publication number
EP1186383A2
EP1186383A2 EP01810778A EP01810778A EP1186383A2 EP 1186383 A2 EP1186383 A2 EP 1186383A2 EP 01810778 A EP01810778 A EP 01810778A EP 01810778 A EP01810778 A EP 01810778A EP 1186383 A2 EP1186383 A2 EP 1186383A2
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EP
European Patent Office
Prior art keywords
microcontroller
torque
measured
hand tool
output
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Granted
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EP01810778A
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German (de)
French (fr)
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EP1186383B1 (en
EP1186383A3 (en
Inventor
Roland Schaer
Hans Böni
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Hilti AG
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Hilti AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S388/00—Electricity: motor control systems
    • Y10S388/935—Specific application:
    • Y10S388/937—Hand tool

Definitions

  • the invention relates to an at least partially rotating electric hand tool device such as a drill or drill bit with a safety clutch for interruption the power transmission from the electric drive to the tool spindle when dangerous Operating conditions, such as tool blockages.
  • the tool blockages that occur with rotating electrical hand tool devices e.g. by reinforcing iron hits when drilling in concrete, generated by the associated sudden high torque a rotation of the housing of the electrical hand tool device along the tool axis, which can lead to injury to the user.
  • Such high Torques are usually achieved by a slip clutch within the Power transmission chain limited.
  • an electric hand tool device uses a microcontroller the rotational movement of the housing is recorded via acceleration sensors and when exceeded a threshold value via the safety clutch the power transmission chain separated.
  • the prerequisite is a necessary freedom of movement for the housing. Becomes For example, drilled directly next to a wall, this is not possible and the operator can Clamp by hand, which also requires a purely mechanical slip clutch.
  • this method requires a relatively high computing power and therefore expensive Microcontroller.
  • an electric hand tool device includes a microcontroller, which in real time using engine speed sensors and the engine speed as well as other sensors measures the input current.
  • the microcontroller regulates under hardware and software Using the measured motor speed over the input current the motor torque and monitor it. An interruption in the input current at impermissibly high levels Due to the inertia of the rotor, torques nevertheless lead to an inadmissible high torsion of the housing.
  • the rotary vibration of the Housing detected via acceleration sensors and when there is no zero crossing the power transmission chain within a time window via the safety clutch separated.
  • relatively small increases in torque can also occur cause an unnecessary disconnection of the power transmission chain.
  • the object of the invention is to realize an electric hand tool device with a safety clutch, which the power transmission chain only with high torque increases separates.
  • the speed of the electric motor and a second are advantageously also measured Computing element of the microcontroller using a friction characteristic into a calculated friction torque mapped, which is the stationary torque calculated at a summation point is added, thereby improving its accuracy.
  • the measured torque is directly and additionally via a filter element in the form of a low-pass filter, which like the one above the Torque calculated stationary input current delayed to a change of the Torque reacts, electronically filtered and made available to the microcontroller.
  • the measured torque is also advantageous in the control element of the microcontroller compared with a fixed threshold value and if a threshold value for the Difference over the safety clutch the power transmission chain disconnected.
  • control element of the microcontroller further advantageously includes further delay and Filter elements, resulting in short torque peaks, which are not one for the user dangerous deflection of the housing, not to disconnect the power transmission chain to lead.
  • the microcontroller advantageously also controls the disconnection of the power transmission chain a braking of the rotor of the electric motor via the safety clutch controllable braking means, for example by feeding in the remanent voltage of the rotor winding into the reversed main winding with the addition of a reversing pole winding.
  • FIG. 1 shows an electric hand tool device, not shown, which is not shown an electrically controllable safety clutch within a power transmission chain with an electric motor with a controllable braking means, a microcontroller 1 on which the measured torque M, the input current I and the speed n of the electric motor is present as an input variable.
  • a first computing element 2 of the microcontroller 1 is the input current I of the electric motor present at the input via a Motor characteristic 3 mapped stationary in an electrical torque at the output which at a summation point 4 the calculated friction torque, which over a second computing element 5 of the microcontroller 1 with the speed n applied to the input, which is mapped via a friction characteristic 6 into a calculated friction torque at the output is added and at the output of summation point 4 is calculated as stationary Torque M 'is present.
  • a control element 7 of the microcontroller 1 with the output of the summation point 4 and the measured torque M as an input variable by comparing the difference ⁇ between the two input variables with a threshold value when exceeded whose output signal is a control signal ⁇ for the safety clutch and for generates a braking means which are controllably connected to the microcontroller 1.
  • the torque M present at the input is delayed as calculated torque M 'a control element 7 of the microcontroller 1 as the first Input variable provided, which with the measured torque M as second input variable by comparing the difference ⁇ between the two input variables with one Threshold value if a control signal ⁇ for the output signal is exceeded Safety clutch and generated for a brake means, which with the microcontroller 1 are controllably connected.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Power Tools In General (AREA)

Abstract

The tool has an electric safety coupling controlled by a microcontroler (1) whose input parameter is the electric tool motor's measured input current (I), that computes (2) a torque from the current and that outputs a safety coupling separation control signal if the torque signal exceeds a threshold. The measured torque is compared with the computed torque and a control signal is output if the difference exceeds a threshold.

Description

Die Erfindung bezeichnet ein zumindest teilweise drehendes Elektrohandwerkzeuggerät wie eine Bohrmaschine oder einen Bohrmeissel mit einer Sicherheitskupplung zur Unterbrechung der Kraftübertragung vom Elektroantrieb zur Werkzeugspindel bei gefährlichen Betriebszuständen, wie Werkzeugblockaden.The invention relates to an at least partially rotating electric hand tool device such as a drill or drill bit with a safety clutch for interruption the power transmission from the electric drive to the tool spindle when dangerous Operating conditions, such as tool blockages.

Die bei drehenden Elektrohandwerkzeuggeräten auftretenden Werkzeugblockaden, bspw. durch Armierungseisentreffer bei Bohren in Beton, erzeugen durch das damit verbundene plötzliche hohe Drehmoment eine Drehung des Gehäuses des Elektrohandwerkzeuggerätes längs der Werkzeugachse, die zu einer Verletzung des Nutzers führen kann. Derartige hohe Drehmomente werden üblicherweise durch eine Rutschkupplung innerhalb der Kraftübertragungskette begrenzt.The tool blockages that occur with rotating electrical hand tool devices, e.g. by reinforcing iron hits when drilling in concrete, generated by the associated sudden high torque a rotation of the housing of the electrical hand tool device along the tool axis, which can lead to injury to the user. Such high Torques are usually achieved by a slip clutch within the Power transmission chain limited.

Nach der DE3707052 wird bei einem Elektrohandwerkzeuggerät über einen Mikrocontroller die Drehbewegung des Gehäuses über Beschleunigungssensoren erfasst und bei Überschreiten eines Schwellwertes über die Sicherheitskupplung die Kraftübertragungskette aufgetrennt. Vorraussetzung ist ein notwendiger Bewegungsfreiraum des Gehäuses. Wird bspw. direkt neben einer Wand gebohrt ist dies nicht möglich, und der Bediener kann die Hand einklemmen, wodurch zusätzlich eine rein mechanische Rutschkupplung notwendig ist. Darüber hinaus benötigt dieses Verfahren eine relativ hohe Rechenleistung und somit teure Mikrocontroller.According to DE3707052 an electric hand tool device uses a microcontroller the rotational movement of the housing is recorded via acceleration sensors and when exceeded a threshold value via the safety clutch the power transmission chain separated. The prerequisite is a necessary freedom of movement for the housing. Becomes For example, drilled directly next to a wall, this is not possible and the operator can Clamp by hand, which also requires a purely mechanical slip clutch. In addition, this method requires a relatively high computing power and therefore expensive Microcontroller.

Nach der US5563482 beinhaltet ein Elektrohandwerkzeuggerät einen Mikrocontroller, welcher in Echtzeit über Drehzahlsensoren die Motordrehzahl sowie über weitere Sensoren den Eingangsstrom misst. Der Mikrocontroller regelt hard- und softwaregesteuert unter Verwendung der gemessenen Motordrehzahl über den Eingangsstrom das Motordrehmoment und überwacht es. Eine Unterbrechung des Eingangsstroms bei unzulässig hohen Drehmomenten führt durch die Masseträgheit des Rotors dennoch zu einer unzulässig hohen Verdrehung des Gehäuses.According to US5563482, an electric hand tool device includes a microcontroller, which in real time using engine speed sensors and the engine speed as well as other sensors measures the input current. The microcontroller regulates under hardware and software Using the measured motor speed over the input current the motor torque and monitor it. An interruption in the input current at impermissibly high levels Due to the inertia of the rotor, torques nevertheless lead to an inadmissible high torsion of the housing.

Nach der DE4334933 wird bei einem Elektrohandwerkzeuggerät die Drehvibration des Gehäuses über Beschleunigungssensoren erfasst und bei fehlendem Nulldurchgang innerhalb eines Zeitfensters über die Sicherheitskupplung die Kraftübertragungskette aufgetrennt. Bei geringen Vibrationen können auch relativ geringe Drehmomentanstiege zu einer unnötigen Auftrennung der Kraftübertragungskette führen.According to DE4334933, the rotary vibration of the Housing detected via acceleration sensors and when there is no zero crossing the power transmission chain within a time window via the safety clutch separated. With low vibrations, relatively small increases in torque can also occur cause an unnecessary disconnection of the power transmission chain.

Die Aufgabe der Erfindung besteht in der Realisierung eines Elektrohandwerkzeuggerätes mit einer Sicherheitskupplung, welche nur bei hohen Drehmomentanstiegen die Kraftübertragungskette auftrennt.The object of the invention is to realize an electric hand tool device with a safety clutch, which the power transmission chain only with high torque increases separates.

Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The task is essentially solved by the features of the independent claims. Advantageous further developments result from the subclaims.

Im wesentlichen wird bei einem Elektrohandwerkzeuggerät mit elektrisch durch einen Mikrocontroller steuerbarer Sicherheitskupplung das Drehmoment und der Eingangsstrom des Elektromotors gemessen, wobei in einer ersten Ausführungsvariante in einem ersten Rechenglied des Mikrocontrollers der Eingangsstrom des Elektromotors über eine Motorkennlinie stationär in ein berechnetes Drehmoment abgebildet wird, welches in einem Steuerglied des Mikrocontrollers mit dem gemessenen Drehmoment verglichen wird und bei Überschreitung eines Schwellwertes für die Differenz über die Sicherheitskupplung die Kraftübertragungskette aufgetrennt.In essence, in an electric hand tool device with electrical by a Microcontroller controllable safety clutch the torque and the input current of the electric motor measured, in a first embodiment in a first Computing element of the microcontroller the input current of the electric motor via a Engine characteristic curve is mapped stationary in a calculated torque, which in one Control element of the microcontroller is compared with the measured torque and at Exceeding a threshold value for the difference via the safety clutch Power transmission chain broken.

Da auf Grund der Dynamik der Kraftübertragungskette wie bspw. der Masseträgheit des Rotors und des Torsionswiderstandes der Kraftübertragungskette der Motorstrom entsprechend eines Filters erster oder höherer Ordnung zeitlich verzögert auf eine Änderung des Drehmoments reagiert, diese Dynamik jedoch nicht in das stationär berechnete Drehmoment eingeht, ist die Differenz zwischen dem gemessenen und dem berechneten Drehmoment ein Mass für den Drehmomentanstieg.Because of the dynamics of the power transmission chain, such as the inertia of the Rotor and the torsional resistance of the power transmission chain the motor current accordingly a filter of a first or higher order is delayed due to a change in Torque reacts, but this dynamic does not translate into the stationary torque is the difference between the measured and the calculated torque Measure of the torque increase.

Vorteilhaft wird zusätzlich die Drehzahl des Elektromotors gemessen und einem zweiten Rechenglied des Mikrocontrollers über eine Reibkennlinie in ein berechnetes Reibmoment abgebildet, welches dem stationär berechneten Drehmoment in einem Summationspunkt hinzuaddiert wird, wodurch dessen Genauigkeit verbessert wird.The speed of the electric motor and a second are advantageously also measured Computing element of the microcontroller using a friction characteristic into a calculated friction torque mapped, which is the stationary torque calculated at a summation point is added, thereby improving its accuracy.

In einer zweiten Ausführungsvariante wird das gemessene Drehmoment direkt und zusätzlich über ein Filterglied in Form eines Tiefpasses, welcher wie das über den Eingangsstrom stationär berechnete Drehmoment zeitlich verzögert auf eine Änderung des Drehmoments reagiert, elektronisch gefiltert dem Mikrocontroller zur Verfügung gestellt. In a second embodiment variant, the measured torque is directly and additionally via a filter element in the form of a low-pass filter, which like the one above the Torque calculated stationary input current delayed to a change of the Torque reacts, electronically filtered and made available to the microcontroller.

Vorteilhaft wird im Steuerglied des Mikrocontrollers das gemessene Drehmoment zusätzlich mit einem festen Schwellwert verglichen und bei Überschreitung eines Schwellwertes für die Differenz über die Sicherheitskupplung die Kraftübertragungskette aufgetrennt.The measured torque is also advantageous in the control element of the microcontroller compared with a fixed threshold value and if a threshold value for the Difference over the safety clutch the power transmission chain disconnected.

Weiter vorteilhaft beinhaltet das Steuerglied des Mikrocontrollers weitere Verzögerungs- und Filterglieder, wodurch kurze Drehmomentspitzen, welche nicht zu einer für den Nutzer gefährlichen Auslenkung des Gehäuses führen können, nicht zum Auftrennen der Kraftübertragungskette führen.The control element of the microcontroller further advantageously includes further delay and Filter elements, resulting in short torque peaks, which are not one for the user dangerous deflection of the housing, not to disconnect the power transmission chain to lead.

Vorteilhaft steuert der Mikrocontroller zusätzlich zur Auftrennung der Kraftübertragungskette über die Sicherheitskupplung eine Abbremsung des Rotors des Elektromotors über ein steuerbares Bremsmittel an, bspw. durch Einspeisung der Remanenzspannung der Rotorwicklung in die umgepolte Hauptwicklung unter Hinzuschalten einer Wendepolwicklung.The microcontroller advantageously also controls the disconnection of the power transmission chain a braking of the rotor of the electric motor via the safety clutch controllable braking means, for example by feeding in the remanent voltage of the rotor winding into the reversed main winding with the addition of a reversing pole winding.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 als erste Ausführungsvariante des Mikrocontrollers
  • Fig. 2 als zweite Ausführungsvariante des Mikrocontrollers
    • The invention is explained in more detail with respect to an advantageous exemplary embodiment with:
  • Fig. 1 as a first embodiment of the microcontroller
  • Fig. 2 as a second embodiment of the microcontroller

    • Nach Fig. 1 weist ein nicht dargestelltes Elektrohandwerkzeuggerät, welches nicht dargestellt eine elektrisch steuerbaren Sicherheitskupplung innerhalb einer Kraftübertragungskette mit einem Elektromotor mit einem steuerbaren Bremsmittel beinhaltet, einen Mikrocontroller 1 auf, an welchem das gemessene Drehmoment M, der Eingangsstrom I und die Drehzahl n des Elektromotors als Eingangsgrösse anliegt. In einem ersten Rechenglied 2 des Mikrocontrollers 1 wird der am Eingang anliegende Eingangsstrom I des Elektromotors über eine Motorkennlinie 3 stationär in ein elektrisches Drehmoment am Ausgang abgebildet, zu welchem an einem Summationspunkt 4 das berechnete Reibmoment, welches über ein zweites Rechenglied 5 des Mikrocontrollers 1 mit am Eingang anliegender Drehzahl n, welche über eine Reibkennlinie 6 in ein berechnetes Reibmoment am Ausgang abgebildet wird, hinzuaddiert wird und am Ausgang des Summationspunktes 4 als stationär berechnetes Drehmoment M' vorliegt. In einem Steuerglied 7 des Mikrocontrollers 1 mit dem Ausgang des Summationspunktes 4 und dem gemessenen Drehmoment M als Eingangsgrösse wird durch Vergleich der Differenz Δ beider Eingangsgrössen mit einem Schwellwert bei Überschreitung dessen als Ausgangssignal ein Steuersignal  für die Sicherheitskupplung und für ein Bremsmittel erzeugt, welche mit dem Mikrocontroller 1 steuerbar verbunden sind.1 shows an electric hand tool device, not shown, which is not shown an electrically controllable safety clutch within a power transmission chain with an electric motor with a controllable braking means, a microcontroller 1 on which the measured torque M, the input current I and the speed n of the electric motor is present as an input variable. In a first computing element 2 of the microcontroller 1 is the input current I of the electric motor present at the input via a Motor characteristic 3 mapped stationary in an electrical torque at the output which at a summation point 4 the calculated friction torque, which over a second computing element 5 of the microcontroller 1 with the speed n applied to the input, which is mapped via a friction characteristic 6 into a calculated friction torque at the output is added and at the output of summation point 4 is calculated as stationary Torque M 'is present. In a control element 7 of the microcontroller 1 with the output of the summation point 4 and the measured torque M as an input variable by comparing the difference Δ between the two input variables with a threshold value when exceeded whose output signal is a control signal  for the safety clutch and for generates a braking means which are controllably connected to the microcontroller 1.

    Nach Fig. 2 weist ein nicht dargestelltes Elektrohandwerkzeuggerät, welches nicht dargestellt eine elektrisch steuerbaren Sicherheitskupplung innerhalb einer Kraftübertragungskette mit einem Elektromotor mit einem steuerbaren Bremsmittel beinhaltet, einen Mikrocontroller 1 auf, an welchem das gemessene Drehmoment M anliegt. Über ein elektronisches Filterglied 8 wird das am Eingang anliegende Drehmoment M zeitlich verzögert als berechnetes Drehmoment M' einem Steuerglied 7 des Mikrocontrollers 1 als erste Eingangsgrösse zur Verfügung gestellt, welches mit dem gemessenen Drehmoment M als zweite Eingangsgrösse durch Vergleich der Differenz Δ beider Eingangsgrössen mit einem Schwellwert bei Überschreitung dessen als Ausgangssignal ein Steuersignal  für die Sicherheitskupplung und für ein Bremsmittel erzeugt, welche mit dem Mikrocontroller 1 steuerbar verbunden sind.2 has an electric hand tool device, not shown, which is not shown an electrically controllable safety clutch within a power transmission chain with an electric motor with a controllable braking means, a microcontroller 1 on which the measured torque M is applied. Via an electronic Filter element 8, the torque M present at the input is delayed as calculated torque M 'a control element 7 of the microcontroller 1 as the first Input variable provided, which with the measured torque M as second input variable by comparing the difference Δ between the two input variables with one Threshold value if a control signal  for the output signal is exceeded Safety clutch and generated for a brake means, which with the microcontroller 1 are controllably connected.

    Claims (8)

    Elektrohandwerkzeuggerät mit einer elektrisch durch einen Mikrocontroller (1) steuerbaren Sicherheitskupplung innerhalb einer Kraftübertragungskette mit einem Elektromotor, wobei dem Mikrocontroller (1) der gemessene Eingangsstrom (I) des Elektromotors als Eingangsgrösse zugeordnet ist, in einem ersten Rechenglied (2) des Mikrocontrollers (1) der Eingangsstrom (I) des Elektromotors über eine Motorkennlinie (3) stationär in ein berechnetes Drehmoment (M') abgebildet wird, welches einem Steuerglied (7) des Mikrocontrollers (1) als Eingangsgrösse anliegt und bei Überschreitung eines Schwellwertes am Ausgang ein Steuersignal () für die Sicherheitskupplung zur Auftrennung der Kraftübertragungskette erzeugt, dadurch gekennzeichnet, dass als zweite Eingangsgrösse am Steuerglied (7) des Mikrocontrollers (1) das gemessene Drehmoment (M) anliegt, welches mit dem berechneten Drehmoment (M') verglichen wird und bei Überschreitung des Schwellwertes durch die Differenz (Δ) beider Eingangsgrössen des Steuergliedes (7) am Ausgang das Steuersignal () erzeugt wird.Electric hand tool device with a safety clutch that can be controlled electrically by a microcontroller within a power transmission chain with an electric motor, the measured input current (I) of the electric motor being assigned as the input variable to the microcontroller in a first computing element (2) of the microcontroller (1) the input current (I) of the electric motor is mapped stationary via a motor characteristic (3) into a calculated torque (M '), which is applied to a control element (7) of the microcontroller (1) as an input variable and, if a threshold value is exceeded at the output, a control signal ( ) for the safety clutch to disconnect the power transmission chain, characterized in that the measured input torque (M) is applied to the control element (7) of the microcontroller (1) as a second input variable, which is compared with the calculated torque (M ') and if the Threshold value by the difference (Δ) between the two inputs angsgrössen the control element (7) at the output, the control signal () is generated. Elektrohandwerkzeuggerät nach Anspruch 1, dadurch gekennzeichnet, dass als zusätzliche Eingangsgrösse des Mikrocontrollers (1) die gemessene Drehzahl (n) des Elektromotors an einem zweiten Rechenglied (5) des Mikrocontrollers (1) anliegt, welche über eine Reibkennlinie (6) in ein berechnetes Reibmoment am Ausgang des zweiten Rechengliedes (5) abgebildet wird.Electric hand tool device according to claim 1, characterized in that, as an additional input variable of the microcontroller (1), the measured speed (s) of the electric motor is applied to a second computing element (5) of the microcontroller (1), which is converted into a calculated frictional torque via a friction characteristic (6) is mapped at the output of the second computing element (5). Elektrohandwerkzeuggerät nach Anspruch 2, dadurch gekennzeichnet, dass der Ausgang des zweiten Rechengliedes (5) und der Ausgang des ersten Rechengliedes (2) die Eingänge eines Summationspunktes (4) ausbilden, welcher am Ausgang ein berechnetes Drehmoment (M') ausgibt.Electric hand tool device according to claim 2, characterized in that the output of the second computing element (5) and the output of the first computing element (2) form the inputs of a summation point (4) which outputs a calculated torque (M ') at the output. Elektrohandwerkzeuggerät mit einer elektrisch durch einen Mikrocontroller (1) steuerbaren Sicherheitskupplung innerhalb einer Kraftübertragungskette mit einem Elektromotor, wobei in einem Steuerglied (7) des Mikrocontrollers (1) bei Überschreitung eines Schwellwertes am Ausgang ein Steuersignal () für die Sicherheitskupplung zur Auftrennung der Kraftübertragungskette erzeug bar ist, dadurch gekennzeichnet, dass als erste Eingangsgrösse am Steuerglied (7) des Mikrocontrollers (1) ein über ein Filterglied (8) elektronisch gefiltertes gemessenes Drehmoment (M) als berechnetes Drehmoment (M') anliegt und dass als zweite Eingangsgrösse am Steuerglied (7) des Mikrocontrollers (1) das gemessene Drehmoment (M) direkt anliegt, welches mit dem berechneten Drehmoment (M') verglichen wird und bei Überschreitung des Schwellwertes durch die Differenz (Δ) beider Eingangsgrössen des Steuergliedes (7) am Ausgang das Steuersignal () erzeugt wird.Electric hand tool device with a safety clutch electrically controllable by a microcontroller (1) within a power transmission chain with an electric motor, a control signal () for the safety clutch for disconnecting the power transmission chain being generated in a control element (7) of the microcontroller (1) when a threshold value at the output is exceeded bar, characterized in that the first input variable at the control element (7) of the microcontroller (1) is a measured torque (M) electronically filtered via a filter element (8) as the calculated torque (M ') and that the second input variable at the control element ( 7) of the microcontroller (1) the measured torque (M) is directly applied, which is compared with the calculated torque (M ') and if the threshold value is exceeded by the difference (Δ) of the two input variables of the control element (7) at the output the control signal ( ) is generated. Elektrohandwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Steuerglied (7) des Mikrocontrollers (1) Verzögerungs- und/oder Filterglieder beinhaltet.Electric hand tool device according to one of the preceding claims, characterized in that the control element (7) of the microcontroller (1) contains delay and / or filter elements. Verfahren zur Steuerung eines Elektrohandwerkzeuggerätes mit einer steuerbaren Sicherheitskupplung innerhalb einer Kraftübertragungskette mit einem Elektromotor durch einen Mikrocontroller (1), wobei in einem ersten Schritt der Eingangsstrom (I) des Elektromotors gemessen und über eine Motorkennlinie (3) stationär in ein berechnetes Drehmoment (M') abgebildet wird oder das elektrisch gefilterte gemessene Drehmoment (M) als stationär berechnetes Drehmoment (M') verwendet wird, und in einem letzten Schritt durch einen Vergleich mit einem Schwellwert am Ausgang ein Steuersignal () für die Sicherheitskupplung zur Auftrennung der Kraftübertragungskette erzeugt wird, dadurch gekennzeichnet, dass in einem zweiten Schritt das Drehmoment (M) gemessen und die zu dem stationär berechneten Drehmoment (M') gebildete Differenz (Δ) für den Vergleich mit dem Schwellwert verwendet wird.Method for controlling an electric hand tool device with a controllable safety clutch within a power transmission chain with an electric motor by means of a microcontroller (1), the input current (I) of the electric motor being measured in a first step and stationary via a motor characteristic curve (3) into a calculated torque (M ' ) is mapped or the electrically filtered measured torque (M) is used as the stationary calculated torque (M '), and in a last step a control signal () for the safety clutch for disconnecting the power transmission chain is generated by a comparison with a threshold value at the output , characterized in that in a second step the torque (M) is measured and the difference (Δ) formed from the stationary calculated torque (M ') is used for the comparison with the threshold value. Elektrohandwerkzeuggerät nach Anspruch 6, dadurch gekennzeichnet, dass im letzten Verfahrensschritt zusätzlich das gemessene Drehmoment (M) mit einem festen Schwellwert verglichen wird.Electric hand tool device according to claim 6, characterized in that in the last method step the measured torque (M) is additionally compared with a fixed threshold value. Elektrohandwerkzeuggerät nach Anspruch 6 oder Anspruch 7, dadurch gekennzeichnet, dass im letzten Verfahrensschritt der Mikrocontroller (1) zusätzlich eine Abbremsung des Rotors des Elektromotors steuert.Electric hand tool device according to claim 6 or claim 7, characterized in that in the last method step, the microcontroller (1) additionally controls braking of the rotor of the electric motor.
    EP01810778A 2000-08-24 2001-08-13 Electric hand tool with safety coupling Expired - Lifetime EP1186383B1 (en)

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    DE10041632A DE10041632A1 (en) 2000-08-24 2000-08-24 Electric hand tool device with safety coupling

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    DE50113809D1 (en) 2008-05-15
    US6700341B2 (en) 2004-03-02
    ZA200106988B (en) 2002-03-04
    US20020053892A1 (en) 2002-05-09
    CN1255248C (en) 2006-05-10
    JP4913294B2 (en) 2012-04-11
    EP1186383B1 (en) 2008-04-02
    JP2002137178A (en) 2002-05-14
    DE10041632A1 (en) 2002-03-07
    EP1186383A3 (en) 2006-04-26
    CN1340408A (en) 2002-03-20

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