EP2146822B1 - Visseuse électrique - Google Patents

Visseuse électrique Download PDF

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Publication number
EP2146822B1
EP2146822B1 EP08757966A EP08757966A EP2146822B1 EP 2146822 B1 EP2146822 B1 EP 2146822B1 EP 08757966 A EP08757966 A EP 08757966A EP 08757966 A EP08757966 A EP 08757966A EP 2146822 B1 EP2146822 B1 EP 2146822B1
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EP
European Patent Office
Prior art keywords
torque
electric motor
power screwdriver
ist
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08757966A
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German (de)
English (en)
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EP2146822A2 (fr
Inventor
Marc Gareis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Losomat Schraubtechnik Neef GmbH
Loesomat Schraubtechnik Neef GmbH
Original Assignee
Losomat Schraubtechnik Neef GmbH
Loesomat Schraubtechnik Neef GmbH
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Publication of EP2146822A2 publication Critical patent/EP2146822A2/fr
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Publication of EP2146822B1 publication Critical patent/EP2146822B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers

Definitions

  • the invention relates to a power wrench according to the preamble of the independent claim.
  • a power-driven screwdriver which provides a predetermined torque setpoint.
  • the torque applied by the screwdriver is detected indirectly on the basis of the current flowing through the electric motor. Due to the mains connection, the starting point is an operating voltage of the electric motor, which is always the same and constant. If the torque setpoint has not yet been reached, the screwdriver turns at the maximum possible speed, which depends on the torque setpoint to be applied. Due to the inertia of the rotating parts of the screwdriver, such as electric motor and in particular gear, the screw is still rotated depending on the caster after reaching the torque setpoint.
  • the in the DE 23 26 027 A1 occurring problem due to the further rotation of the screwdriver when reaching the torque setpoint is of the DE 103 41 975 A1 addressed.
  • Described is an electronic torque limiting device for an example used in a battery-powered screwdriver electric motor.
  • the starting point is an electronic torque limitation, in which the current flowing through the electric motor is used as a measure of the torque.
  • Such a procedure is referred to as inaccurate, because in particular at high speeds after switching off the electric motor by the kinetic energy of the rotating masses can occur with the result that a screw is tightened with a higher torque than the predetermined torque setpoint.
  • a torque setpoint can be set, which is converted into a maximum value of the electric motor current. The higher the maximum value of the electric motor current is set, the lower may be the maximum speed of the electric motor.
  • a battery-powered small screwdriver described, which includes a switching element, which the electric motor by shorting off.
  • the switching element is actuated by a depth stop.
  • the abrupt deceleration of the electric motor reduces overshoot.
  • short-circuiting of the electric motor is possible only at comparatively low torques to be delivered, for example, 100 Nm and low-power electric motors, even in low-power electric motors in the case of short-circuiting a high-speed rotating electric motor with a significant short-circuit current and the related electromagnetic interference must be expected.
  • the short-circuit current loads both a collector of a DC motor realized as an electric motor and the switching element used for shorting the electric motor to a considerable extent.
  • the DE 43 10 936 A1 discloses a power wrench that is completely shut down when it has reached a torque setpoint.
  • the value at which the power wrench is turned off is adjustable and is below the magnitude of the torque overshoot below a target value. The shutdown is used to advance the tool and fastener to the target torque due to overshoot.
  • DE 103 45 135 A1 is a small battery-powered screwdriver described that contains a lithium-ion battery for power.
  • DE 201 13 184 U1 and for example the DE 196 47 813 A1 are provided as power tools designed electric motor driven screwdriver, each having a support arm for providing a counter torque when tightening or loosening screw.
  • Such screwdrivers are referred to as power wrenches, because the torque provided can amount to, for example, 10,000 Nm, which could not be applied without the support arm of an operator of the power wrench.
  • the Support arm elastic With increasing torque during the screwing deforms the Support arm elastic, whereby the support arm absorbs energy.
  • the support arm clamps the screwdriver on the screw connection.
  • the support arm takes not only the energy occurring during the screwing, but also after the shutdown of the power wrench still in the rotating masses such as the electric motor and in particular the transmission existing rotational energy by deforming.
  • the invention has for its object to provide a power wrench, in particular a battery-powered power wrench, which allows the achievement of a predetermined torque setpoint for a screw without the risk of torque overshoot in an optimal manner.
  • the power wrench according to the invention has the features of claim 1.
  • the power wrench according to the invention makes it possible, on the basis of the torque gradient determination, to fall short of hard and soft screwdriving cases.
  • the torque threshold setting may selectively set the torque threshold below the torque setpoint such that torque overshoots due to the speed reduction and the complete shutdown of the electric motor when the Torque actual value has reached the torque setpoint.
  • An embodiment provides that the electric motor control the electric motor at a torque actual value, which is below the torque threshold, the maximum possible speed of the electric motor sets. Accordingly, the maximum possible power is made available to the electric motor, whereby the maximum possible rotational speed is set under the given load conditions. With this measure, the screw can be made in the shortest possible time, without the risk of torque overshoot exists.
  • the torque threshold setting determines the difference between the torque setpoint and the torque threshold as a function of the torque gradient. This measure covers the entire spectrum from soft to hard screwdriving cases.
  • the torque threshold setting adds the difference a larger torque gradient to a higher value than a smaller torque gradient so that torque overshoot is avoided in both hard and soft tightening.
  • the torque threshold definition contains a table in which torque gradients and torque setpoints are stored for determining the torque threshold value.
  • the torque threshold setting extrapolates the torque threshold based on the determined torque gradient, the torque actual value and the set torque setpoint.
  • Another embodiment provides a motor current detection, which detects the motor current as a measure of the actual torque value.
  • the motor current detection can be realized, for example, as a low-impedance shunt, which is cheaper to implement compared to an electromagnetic motor current detection.
  • Another embodiment provides a data carrier in which characteristic values of the screw connection are stored and / or which is provided for the storage of recorded data of the screw connection to be produced.
  • the data carrier contains at least the predetermined torque setpoint. At least the actually achieved torque actual value of the screw connection can be stored.
  • the data carrier may further contain parameters such as calibration data of the power wrench or be provided for storing such characteristics.
  • the data carrier can be assigned to the power screwdriver.
  • the power wrench on means for signal transmission to a arranged outside the power wrench disk.
  • a development provides a voltage limiter circuit which limits the motor voltage occurring at the electric motor to a predetermined limiting voltage.
  • the limiting voltage is preferably set at least to the nominal operating voltage of the electric motor, so that the electric motor can contribute to reducing an optionally stored in a support arm of the power wrench towards the end of the screwing energy by operating the electric motor in the generator mode, without the electric motor applies a counter-torque.
  • the voltage limiter circuit preferably includes a bipolar limiter diode and / or a varistor.
  • the power wrench according to the invention provides as a power source for the electric motor before a lithium-based accumulator due to its comparatively high energy density.
  • a battery voltage drop compensation circuit is preferably provided, which compensates the influence of a sinking supply voltage on the achievement of the set torque setpoint, which occurs in particular when the torque actual value is obtained from the motor current.
  • a simple implementation of the battery voltage drop compensation circuit provides that the battery voltage drop compensation circuit either increases the setpoint torque setpoint or reduces the determined actual torque value when the supply voltage drops. As a result, an intervention in the power section of the electric motor is avoided.
  • FIG. 1 shows a sketch of a power wrench 10, which includes an electric motor 12 as a drive, which drives a socket 16 via a gear 14.
  • the power wrench 10 includes a support arm 18 which provides a counter-torque during the screwing operation.
  • a battery-operated power wrench 10 contains a battery part 20 in which an accumulator 22 is accommodated. Commissioning of the power screwdriver 10 takes place with a switch 24.
  • a drive circuit 26 is provided, to which a data carrier 28 and a transmitting / receiving device 30 are assigned.
  • a DC motor 12 is assumed, which is preferably driven by a pulse width modulated signal which determines the average operating voltage of the electric motor 12.
  • an electric motor driver 40 which provides a pulse width modulated signal s_PWM that either fully opens or completely closes a switching element 42, such as a MOS field effect transistor, where the period and / or pulse duration may be variable.
  • the duty cycle of the pulse width modulated signal s_PWM which reflects the ratio of duty cycle to period, sets the mean motor voltage u_Mot and thereby allows influencing the power provided to the electric motor 12 or the rotational speed of the electric motor 12th
  • a motor current i_Mot flows as a function of the pulse duty factor of the pulse width modulated signal s_PWM, as a function of the supply voltage u_Batt and as a function of the load of the electric motor 12.
  • the motor current i_Mot is used as a measure of the torque applied by the electric motor 12 and thus as a measure of the torque actual value provided at the socket 16.
  • the motor current i_Mot is detected with a motor current detection 44, which is implemented as a low-resistance resistor or shunt of, for example, 0.01 ohms.
  • the voltage drop u_Sens which occurs as a measure of the motor current i_Mot at the shunt 44 is amplified in a torque actual value determination 46, which contains, for example, an OpAmp connected as a differential amplifier, and is provided as a measure of the actual torque value md_Ist.
  • a signal smoothing device not shown in detail is provided, which frees the torque actual value md_Ist at least from high-frequency interference signals.
  • the torque actual value md_Ist is provided to the electric motor drive 40, a torque gradient determination 48 and a torque threshold setting 50.
  • the torque gradient determination 48 determines the gradient dmd_Ist / dt of the torque actual value md_Ist by determining at least one time differential quotient. Preferably, the differential quotient is approximated and by the difference quotient.
  • the torque gradient determination 48 provides the torque gradient dmd_Ist / dt of the torque threshold setting 50, which is based on the torque gradient dmd_Ist / dt, the actual torque value md_Ist, that of a torque setpoint specification 52nd provided torque setpoint Md_Soll and a torque minimum value Md_Min a torque threshold Md_Lim determines which of the electric motor driver 40 is available.
  • FIG. 3 shows a first screw SF1, which corresponds to a hard screw case, in which a comparatively rapid change of the torque actual value md_Ist occurs.
  • FIG. 3 shows a second screw SF2, which corresponds to a soft screw case, in which a comparatively slow change of the torque actual value md_Ist occurs.
  • the torque gradient determination 48 determines after the start of the screwing process the torque gradient dmd_Ist / dt, which can be approximated for example by at least one difference quotient. In the illustrated embodiment according to FIG. 3 It is assumed that the torque gradient determination 48 determines at least one difference quotient after exceeding the torque minimum value Md_Min on the basis of a time interval dti.
  • the time interval dti is to be set in such a way that the expected fastest possible torque increase and the lowest set torque setpoint Md_Soll ensure that the torque threshold setting 50 can determine and provide a torque threshold Md_Lim1, Md_Lim2.
  • the torque minimum value Md_Min is set, for example, to a torque actual value md_Ist which is slightly above the expected joining torque of the screw connection. With this measure can ensure that the actual torque gradient dmd_Ist / dt of the screw is determined.
  • the torque threshold setting 50 sets the first torque threshold Md_Lim1 and for the second screwdriver SF2 the second torque threshold Md_Lim2 fixed.
  • the torque threshold values Md_Lim1, Md_Lim2 are each below the torque setpoint Md_Soll.
  • the first torque threshold Md_Lim1 is a first difference d1 below the torque setpoint Md_Soll and the second torque threshold Md_Lim2 is a second difference d2 below the torque setpoint Md_Soll.
  • the torque threshold setting 50 may set the threshold Md_Lim1, Md_Lim2 based on stored tables.
  • functional relationships between the mentioned input variables are stored in the torque threshold setting 50, so that the torque threshold values Md_Lim1.
  • Md_Lim2 can be extrapolated from the current actual torque value md_Ist.
  • the functional relationship can be based on a straight line equation so that the expected torque curve can be completely specified by the slope and a point of the straight line.
  • the torque threshold values Md_Lim1, Md_Lim2 or the functional relationships required for determining the threshold values Md_Lim1, Md_Lim2 are preferably determined experimentally and stored in the torque threshold setting 50.
  • the first torque threshold value Md_Lim1 will be reached at a first time ti1.
  • the first torque threshold Md_Lim1 or the first difference d1 are adapted to a hard screwdriving case, which was detected on the basis of the determined torque gradient dmd_Ist / dt.
  • the first difference d1 is comparatively large.
  • the second torque threshold Md_Lim2 will be reached at a fourth time ti4.
  • the second torque threshold Md_Lim2 or the second difference d2 are adapted to a soft screw case, which was detected on the basis of the determined torque gradient dmd_Ist / dt.
  • the second difference d2 is comparatively small.
  • a first comparator 54 contained in the electric motor drive 40 compares the torque threshold value Md_Lim, Md_Lim1, Md_Lim2 with the actual torque value md_Ist and provides a control signal s_Mot depending on the result of the comparison.
  • the control signal s_Mot ensures that the pulse width modulated signal s_PWM drives the electric motor 12 with a lower power than before, so that the electric motor 12 is given a speed reduction.
  • the speed reduction or the complete shutdown after reaching the torque threshold Md_Lim, Md_Lim1, Md_Lim2 substantially prevents the actual torque value md_Ist from overshooting, which would cause the screw connection to be screwed to a torque higher than the torque setpoint Md_Soll would.
  • the overshoot is caused by the existing in the electric motor 12 and in particular in the transmission 14 kinetic energy towards the end of the screwing.
  • the hard screw SF1 critical, because in a relatively short time ti the torque setpoint Md_Soll is reached.
  • the embodiment shown is to illustrate the Problem assumed that despite the speed reduction or the complete shutdown of the electric motor 12 after exceeding the first torque threshold Md_Lim1 the increase of the torque actual value md_Ist until a second time ti2 almost without reduction of the torque gradient dmd_Ist / dt ,
  • the speed reduction of the electric motor 12 initiated by the control signal s_Mot and predetermined by the pulse-width-modulated signal s_PWM therefore only has an effect from the second time ti2.
  • the torque setpoint Md_Soll is reached at a third time ti3 with a reduced torque gradient dmd_Ist / dt.
  • a shutdown of the electric motor 12 is provided. This switch-off is initiated by a stop signal s_Stop, which provides a second comparator 56 arranged in the electric motor drive 40 as a function of the comparison result between the torque setpoint Md_Soll and the actual torque value md-Ist.
  • the second torque threshold Md_Lim2 may be much closer to the torque setpoint Md_Soll, corresponding to a smaller difference d2. In this case as well, after the second torque threshold value Md_Lim2 has been reached, the speed reduction of the electric motor 12 is initiated.
  • SF2 also occurs in the case of the soft torque limit Overshoot prevents the gland from exactly matching the torque setpoint Md_Soll is reached, which is reached at a fifth time ti5.
  • the battery 22 which is preferably realized as a lithium-based accumulator, which is characterized by a high energy density.
  • a lithium-based accumulator which is characterized by a high energy density.
  • the battery 22 provides the supply voltage u_Batt.
  • a battery voltage drop compensation circuit 60 which compensates the influence of a sinking supply voltage u_Batt on reaching the set torque setpoint Md_Soll.
  • the supply voltage u_Batt could be directly stabilized and kept constant, although power semiconductor devices would be required, which are relatively expensive on the one hand and on the other hand because of the high expected currents to 100 A, for example, are too voluminous to be accommodated in the power wrench 10 can ,
  • the battery voltage drop compensation circuit 60 therefore preferably intervenes with a compensation signal s_Batt_Komp in the torque setpoint input 52 or in the actual torque value determination 46, the torque setpoint Md_Soll being increased when the supply voltage u_Batt decreases.
  • the battery voltage drop compensation circuit 60 may include, for example, a reference voltage source to which the supply voltage u_Batt is compared. With decreasing difference between the reference voltage and the supply voltage u_Batt during the discharge process of the battery 22, the compensation signal s_Batt_ Komp is constantly increased, the increase corresponds to a virtual reduction of the motor current i_Mot to compensate for the actually lower motor current i_Mot with decreasing supply voltage u_Batt in the signal evaluation.
  • the support arm 18 provides the required counter-torque to the torque transmitted by the socket 16 to the screw connection.
  • the support arm 18 is to fix the preparation of the screwing on a suitable support.
  • the screwing occurs depending on the increasing torque correspondingly increasing deformation of the support arm 18, which corresponds to a storage of energy.
  • the stored energy in the support arm 18 has after switching off the power wrench 10 when reaching the set torque setpoint Md_Soll the maximum value.
  • the socket 16 and thus the entire power wrench 10 is clamped on the screw.
  • the stored energy in the support arm 18 causes the electric motor 12, starting from the socket 16, is driven backwards via the gear 14, wherein the electric motor 12 begins to rotate in the opposite direction to the drive direction.
  • the electric motor 12 is therefore operated as a generator in the degradation of stored energy in the support arm 18.
  • the electric motor 12 should be able to rotate freely without applying a counter-torque, which would complicate and extend the discharge process.
  • the electric motor 12 should therefore not be short-circuited or low-resistance bridged in this operating state, wherein even at a low generator voltage, a high motor current i_Mot, corresponding to a high counter-torque would occur. It should be noted here that in generator mode the motor voltage u_Mot reverses due to the other direction of rotation and the motor current i_Mot therefore flows in the opposite direction, provided that the current path is available.
  • the voltage limiter circuit 70 limits the motor voltage u_Mot occurring at the electric motor 12 of the electric motor 12 operated as a generator when the energy stored in the support arm 18 is reduced and counter to the drive direction to a predetermined limiting voltage u_Lim.
  • the voltage limiter circuit 70 is not comparable to a freewheel which essentially short circuits only the electric motor 12.
  • the voltage limiter circuit 70 allows the targeted specification of the limiting voltage u_Lim, so that the electric motor 12 during generator operation in the destruction of the energy stored in the support arm 18 at least until reaching the limiting voltage u_Lim generates no counter-torque.
  • a motor current i_Mot occurs in the reverse direction compared to the normal operation only when the motor voltage u_Mot in the generator operation, the limiting voltage u_Lim tries to exceed.
  • the voltage limiter circuit 70 can take over the function of a freewheel, wherein during the freewheel, in which the direction of the motor current i_Mot does not turn around, the limiting voltage u_Lim occurs as a motor voltage u_Mot.
  • a not shown in detail switched freewheel can be provided, which is driven by the pulse width modulated signal s_PWM.
  • the voltage limiter circuit 70 can be realized in different ways.
  • the voltage limiter circuit 70 includes a bipolar voltage limiter diode 72, which is also referred to as TVS (Transient Voltage Suppressor).
  • the voltage limiter diode 72 includes two zener diodes integrated in a single device.
  • the voltage limiter circuit 70 includes a varistor 74.
  • diodes 72 enable a very fast response to voltage pulses
  • a varistor 74 can receive and derive a higher energy, at least in the short term. Depending on the requirements, therefore, a combination of diodes 72 and a varistor 74 may be provided.
  • the limiting voltage u_Lim is initially set to a value at which no limitation of the motor voltage u_Mot can occur in the normal drive mode of the electric motor 12.
  • the limiting voltage u_Lim is thus set to a value of at least 28 volts in a 28 volt electric motor 12. Since the motor voltage u_Mot reverses in generator operation of the electric motor 12, the voltage limiter circuit 70 must provide the limiting voltage u_Lim, in particular for the motor voltage u_Mot, with reversed polarity, since the risk of overvoltage exists in generator operation in particular.
  • the positive potential of the motor voltage u_Mot on the switching element 42 while the negative potential is applied to the battery 22.
  • a limiting voltage u_Lim is given, which corresponds at least to the amount of the nominal operating voltage of the electric motor 12.
  • at least the effective in the generator mode of the electric motor 12 limiting voltage u_Lim is set to the value of a so-called protection low voltage, which may be set by law.
  • a protective low voltage in this sense should be defined by the fact that on an electrical device, in the present case the power wrench 10, live parts that can be touched must not exceed the protective extra-low voltage. If this could be the case, special measures must be taken to protect against contact.
  • the protective low voltage is for example 42 volts.
  • a data carrier 80 which contains data for the screw connection, such as at least the torque setpoint Md_Soll, and / or for receiving data, such as the torque actual value md_Ist actually achieved, is prepared, which are stored at least at the end of the screwing process.
  • the data carrier 80 may further include calibration data of the power wrench 10 and / or be prepared for storing characteristics of the power wrench 10.
  • the data carrier 80 is realized as a mobile data carrier, for example as a low-cost RFID.
  • a transmitting / receiving device 82 which is designed for receiving and / or transmitting data relating to screwing and / or characteristics of the power wrench 10.
  • the transmitting / receiving device 82 is preferably designed to cooperate with a data carrier, not shown in detail, for example, a mobile data carrier, which may correspond to the data carrier 80. Unless it is at this Disk is an already mentioned RFID, the transmitting / receiving device 82 to a high-frequency transmitter and / or high-frequency receiver, wherein the transmission / reception frequency is tuned to the transmission / reception frequency of the data carrier.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

La présente invention concerne une visseuse électrique (10) comprenant un moteur électrique (12) qui sert d'entraînement, un élément de prédétermination de valeur théorique de couple de rotation (52), un élément de détermination de valeur réelle de couple de rotation (46), un élément de détermination de gradient de couple de rotation (48) et un élément de commande de moteur électrique (40) qui commande le moteur électrique (12) en fonction du gradient de couple de rotation (dmd_lst/dt). Un élément de fixation de valeur seuil de couple de rotation (50) fournit une valeur seuil de couple de rotation (Md_Lim, Md_Lim1, Md_Lim2) qui dépend du gradient de couple de rotation (dmd_lst/dt) et qui est inférieure à la valeur théorique de couple de rotation (Md_Soll). Lorsque la valeur réelle de couple de rotation (mdjst) dépasse la valeur seuil de couple de rotation (Md_Lim, Md_Lim1, Md_Lim2), l'élément de commande de moteur électrique (40) affecte au moteur électrique (12) une diminution de vitesse de rotation ou réalise l'arrêt complet du moteur électrique (12). La visseuse électrique (10) de l'invention permet d'éviter un dépassement de couple de rotation et permet d'obtenir avec exactitude la valeur théorique de couple de rotation (Md_Soll) en un temps minimal.

Claims (16)

  1. Visseuse électrique entraînée par un moteur électrique (12) comportant un moyen de prédéfinition d'une valeur de consigne de couple (52) et un moyen de détermination du couple réel (46), un moyen de détermination du gradient du couple (48) et une commande de moteur électrique (40) qui commande le moteur électrique (12) en fonction du gradient de couple (dmd-Ist/dt),
    visseuse électrique caractérisée par
    - un moyen de fixation d'un seuil de couple (50) qui fournit un seuil de couple (Md_Lim, Md_Lim1, Md_Lim2) dépendant du gradient de couple (dmd_Ist/dt) et inférieur à la valeur de consigne de couple (Md_Soll), et
    - la commande de moteur électrique (40) prédéfinit une réduction de la vitesse de rotation du moteur électrique (12) si la valeur réelle du couple (md_Ist) dépasse le seuil du couple (Md_Lim, Md_Lim1, Md_Lim2) et elle coupe complètement le moteur électrique si la valeur réelle du couple (md_Ist) atteint la valeur de consigne du couple (Md_Soll).
  2. Visseuse électrique selon la revendication 1,
    caractérisée en ce que
    la commande de moteur électrique (40) prédéfinit la vitesse de rotation maximale possible pour le moteur électrique (12) pour une valeur réelle du couple (md_Ist) inférieure au seuil de couple (Md_Lim, Md_Lim1, Md_Lim2).
  3. Visseuse électrique selon la revendication 1 ou 2,
    caractérisée en ce que
    le moyen de fixation du seuil de couple (50) fixe la différence (d1, d2) entre la valeur de consigne du couple (Md_Soll) et le seuil de couple (Md_Lim, Md_Lim1, Md_Lim2) en fonction du gradient de couple (dmd_Ist/dt).
  4. Visseuse électrique selon la revendication 3,
    caractérisée en ce que
    pour un gradient de couple élevé (dmd_Ist/dt), le moyen de fixation du seuil de couple (50) fixe la différence (d1, d2) à un niveau plus élevé que pour un gradient de couple plus petit (dmd_Ist/dt).
  5. Visseuse électrique selon la revendication 1,
    caractérisée en ce que
    le moyen de fixation du seuil de couple (50) comporte un tableau contenant les gradients de couple (dmd_Ist/dt) et des valeurs de consigne de couple (Md_Soll) pour fixer le seuil de couple (Md_Lim, Md_Lim1, Md_Lim2).
  6. Visseuse électrique selon la revendication 1,
    caractérisée en ce que
    le moyen de fixation de seuil de couple (50) extrapole le seuil de couple (Md_Lim, Md_Lim1, Md_Lim2) à l'aide du gradient de couple déterminé (dmd_Ist/dt), de la valeur réelle de couple (md_Ist) et de la valeur de consigne de couple (Md_Soll).
  7. Visseuse électrique selon la revendication 1,
    caractérisée par
    un moyen de détection de l'intensité du courant dans le moteur (44) qui saisit l'intensité du courant dans le moteur (I_Mot) comme mesure de la valeur réelle du couple (md_Ist).
  8. Visseuse électrique selon la revendication 1,
    caractérisée par
    un support de données (80) contenant l'enregistrement des valeurs caractéristiques de la liaison vissée et/ou de la visseuse (10) et/ou qui enregistre les données saisies d'une liaison vissée ou les valeurs caractéristiques de la visseuse (10).
  9. Visseuse électrique selon la revendication 8,
    caractérisée en ce que
    la visseuse (10) comporte des moyens (82) pour transmettre un signal vers un support de données extérieur à la visseuse (10).
  10. Visseuse électrique selon la revendication 1,
    caractérisée par
    un circuit de limitation de tension (70) qui limite la tension (u_Mot) produite sur le moteur électrique (12) à une tension limite (u_Lim) fixée au moins selon la tension nominale de fonctionnement du moteur électrique (12).
  11. Visseuse électrique selon la revendication 10,
    caractérisée en ce que
    le circuit limiteur de tension (70) est une diode bipolaire de limitation (72).
  12. Visseuse électrique selon la revendication 10,
    caractérisée en ce que
    le circuit limiteur de tension (70) comporte un varistor (74).
  13. Visseuse électrique selon la revendication 1,
    caractérisée par
    un accumulateur (22) fournissant la tension d'alimentation (u_Batt).
  14. Visseuse électrique selon la revendication 13,
    caractérisée en ce que
    l'accumulateur (22) est un accumulateur à base de lithium (accumulateur lithium-ion, lithium-polymère).
  15. Visseuse électrique selon la revendication 13 ou 14,
    caractérisée par
    un circuit de compensation de chute de tension (60) qui compense l'influence d'une diminution de la tension d'alimentation (u_Batt) lorsqu'on atteint la valeur de consigne de couple (Md_Soll), réglée.
  16. Visseuse électrique selon la revendication 15,
    caractérisée en ce que
    le circuit de compensation de chute de tension d'accumulateur (60) augmente la valeur de consigne de couple, réglée (Md_Soll) à mesure que diminue la tension de l'alimentation (u_Batt).
EP08757966A 2007-04-23 2008-04-23 Visseuse électrique Not-in-force EP2146822B1 (fr)

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AR066256A1 (es) 2009-08-05
WO2008128523A3 (fr) 2009-01-08
CN101765483A (zh) 2010-06-30
TWI492824B (zh) 2015-07-21
RU2459695C2 (ru) 2012-08-27
BRPI0811037A2 (pt) 2014-12-09
US20100116519A1 (en) 2010-05-13
EP2146822A2 (fr) 2010-01-27
BRPI0811037A8 (pt) 2019-01-15
CN101765483B (zh) 2013-09-18
WO2008128523A2 (fr) 2008-10-30
CA2684786A1 (fr) 2008-10-30
TW200846142A (en) 2008-12-01
DE102007019409B3 (de) 2008-11-13
CL2008001169A1 (es) 2008-10-03
RU2009142992A (ru) 2011-05-27

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