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WO2008148375A1 - Système de commande pour machine électrique portative - Google Patents

Système de commande pour machine électrique portative Download PDF

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Publication number
WO2008148375A1
WO2008148375A1 PCT/DE2008/000919 DE2008000919W WO2008148375A1 WO 2008148375 A1 WO2008148375 A1 WO 2008148375A1 DE 2008000919 W DE2008000919 W DE 2008000919W WO 2008148375 A1 WO2008148375 A1 WO 2008148375A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
operating
electric motor
interval
control device
Prior art date
Application number
PCT/DE2008/000919
Other languages
German (de)
English (en)
Inventor
Silvia Rottmerhusen
Original Assignee
Metabowerke Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metabowerke Gmbh filed Critical Metabowerke Gmbh
Publication of WO2008148375A1 publication Critical patent/WO2008148375A1/fr

Links

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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • 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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket

Definitions

  • the invention relates to a control device for an electric hand tool, according to claim 1.
  • Electric hand tools such as drills, screwdrivers are mainly equipped with an electronic speed control, which are usually operated via an operating element of the operating switch. If necessary, this equipment should be used for an interval-like, jolting turning behavior of the electric hand tool. For such applications, some solutions are already known.
  • DE 44 16 483 81 describes an apparatus and a method for preventing centrifugal and ejection forces in electric power-operated screwdriving tools, in which controls are effective, which lead in time to interruptions of the machine revolutions, this measure being due to power interruptions in a mechanical way , or by the use of controls, which are known from electrical engineering or electronics, can take place. Detailed embodiments are not apparent from this document.
  • DE 199 54 931 A1 describes a circuit device for an electric hand tool whose motor is electrically switchable between two modes, in the first mode, the tool spindle is driven with a continuous torque, and in the second mode with a pulsating torque, with the actuator 4 of the switch at each actuation during the operating phase reverses the engine from the current mode to the other mode.
  • the main switch with a potentiometer 6 should preferably be used as a switch to Changing the operating mode are used, and if each time with appropriate operation of the actuator 4 of the main switch 3 via the potentiometer 6, the speed zero or a very low speed is specified, the control unit 7 changes from the current mode to the other mode.
  • control unit 7 is connected by means of a detection line 9 to the current path between the main switch 3 and the triac 2.
  • EP 0 723 333 B1 describes a method for controlling an electric motor in hand-held power tools.
  • the electric motor 1 is thus subjected in a first operating mode to variable pulses 11, 11 ', 20 of an electrical voltage U such that the rotor of the electric motor 1 moves continuously at an adjustable rotational speed ni, n 2 , and the electric motor 1 is in a second interval-like mode switchable, wherein in the second mode at least parts of at least individual pulses 11, 11 ', 20 by superimposing a pulse pause 12, 12', 22 are blanked with a zero voltage such that the rotor of the electric motor 1 jerk or jerky movement, and the fading of the pulses 11, 11 ', 20 can be triggered manually controllable by the user by the electric motor 1 for the interval-like operation is mechanically switchable, or the fading of the pulses 11, 11', 20 is exceeded a preset limit of a certain torque of the control triggered automatically.
  • EP 1 034 615 Bl describes a control for a commutator motor 1 which is used for an electric hand tool.
  • the speed control electronics is designed so that the commutator motor is operable in a first operation with variable steady speed, and in a second operation with variable steady and temporarily in an interval-like jerking speed, this is the phase control 3, a first and a second control device 4, 5th for a first and a second gate a ', b', c ', d' associated with the half-waves of an alternating voltage, in the second operation of the commutator motor 1 without switching a steady as well as a jerking rotational behavior of the commutator motor is achieved by a raster moderate permanent division the half-waves of the AC voltage in first and second area sections 7, 8 at a fixed set gate height 9 of the half-waves in the second area sections 8, wherein the gate of the half-waves with the first control device 4 in the first and in the second Sternabsc cut 7.8 of the maximum gate up
  • DE 196 09 986 A1 describes a method for operating an electric motor 1 in an electric hand tool.
  • the manually switched on and off electric motor is operated during the operating phase 17 with a first variable preset speed until reaching a preset limit torque, and upon reaching the limit torque of the electric motor 1 is switched in a further operating phase, which lasts until the electric motor is turned off, wherein in the further operating phase, a Nachcardmoment 20 which is interrupted by torque pauses 19 periodically, is exerted by the electric motor.
  • FIG. 2 shows a diagram of the motor current during operation of the electric hand tool. From this diagram and the description it can be seen that in the first area of the diagram with the reference numerals 16, 17 the electric motor is operated with standard variable adjustable speeds and torques, and in the other areas of the diagram with the reference numbers 19, 20, the electric motor is operated with a continuous interval-like jerking rotational behavior, wherein in the region 18 of the electric motor is switched from one mode to the other mode of operation.
  • the invention has for its object to provide a control device for a power hand tool, whereby an interval-like jerking and / or a variable continuous rotational movement of the power tool on the one hand by the user via the operating element of the operating switch can be determined during operation, or on the other hand, an automatic switching of the one Operating mode in the other mode during operation is feasible, during the interval operation, the transmission of the electric hand tool should always be biased.
  • control device for an electric hand tool is that the electric motor is associated with a control device, whereby the user via the operating element of the operating switch during operation can determine when a variable interval-like jerking rotational movement of the power tool is to take place, and when a variable continuous continuous rotary motion is desired.
  • Another advantage is that an automatic switchover from one operating mode to the other operating mode can take place during the screwing operation.
  • these options can be used to screw in variable speed wood screws, and if the screw head is about to stop, the operator can switch to a jerking rotary motion of the power tool via the operating switch control, or switch automatically a program of the controller of the control electronics, whereby a controlled flushing screws is possible.
  • FIG. 1 shows a circuit arrangement for controlling an electrical hand tool equipped with a commutator motor
  • FIG. 2 shows a circuit arrangement for controlling an electric hand tool equipped with a brushless electric motor
  • FIG. 3 to 5 are graphical representations of the voltage of the currents in the electric motor during a variable interval-like operation of the electric hand tool
  • Fig. 6 is a graph showing the current flow in the electric motor during a steady screwing, and by an automatic switching the voltage during an interval-like screwing
  • Fig. 1 shows a circuit arrangement in which an electronic circuit breaker 1 (here a transistor for DC operation) is connected in series with a commutator motor 2.
  • the electronic circuit breaker may also be a triac for AC operation.
  • the commutator motor is connected or disconnected via a switching element 3 to a power source 4. This switching element is located in an operating switch 5.
  • the operating element 6 of the operating switch 5 is associated with the switching element 3 and a potentiometer 7.
  • the electronic circuit breaker 1 is controlled by a control electronics 8, and the terminals 9 of the integrated in the operating switch 5 potentiometer 7 lead to this control electronics.
  • the drive electronics 8 includes a pulse width modulator for DC operation or a phase control for the AC operation, the rotor of the commutator motor 2 brushes are assigned.
  • the electric motor of the electric hand tool can also be designed brushless, in which case the control electronics 8 is assigned a bridge circuit.
  • Fig. 2 shows such a circuit arrangement.
  • the winding strands of the electric motor are each connected at one end to a transistor-equipped half-bridge 10 and connected to the other end in star, and the transistors, the control electronics 8 is assigned, in which case the terminals 9 of the potentiometer 7 of the operating switch 5 to the control electronics to lead.
  • the control electronics 8 preferably includes a controller with a corresponding program for the control of the circuit breaker.
  • the control electronics 8 is associated with a release device 11 for determining the operating mode of the electric hand tool, wherein the release device 11 includes a control device, whereby the user can determine whether a standard variable continuous rotational behavior of the power tool is desired, or whether an interval-like jolting rotational behavior should take place.
  • a standard variable, continuous rotational behavior of the power tool is achieved via the control element 6 of the operating switch 5 in a known manner.
  • a switchover from a mode of operation with variable, continuous rotational behavior to an operating mode with intermittent jerking rotational behavior of the electric motor is released, and it can switch over the operating element 6 of the operating switch 5 between a variable, continuous and an interval-like Rotational behavior of the power tool can be selected such that on the one hand during a work operation with the electric hand tool at _Q_
  • the above-described mode of operation of the electric hand tool is repeated again by means of the program of the controller of the control electronics 8.
  • This mode of operation can also be carried out in a reverse manner by starting an interval-like jerking rotational behavior of the power tool during an activation of the release device 11, and upon a return of the operating element 6 of the operation switch 5, the program of the controller to a variable, continuous Switching rotational behavior of the power tool.
  • the controller of the control electronics 8 may include such a program, whereby an automatic switchover from a variable continuous rotational behavior to a variable interval-like rotational behavior of the electric motor can take place.
  • the operating device of the release device 11 may preferably be provided with a special adjustment device, with which all operating programs of the controller are provided. can be chosen and predetermined, and with what the
  • Length of the intervals of the jolting rotational behavior of the power tool is adjustable.
  • Such an adjustment device can be, for example, a potentiometer with a raster setting which is evaluated by the controller.
  • the intermittent jerking rotational behavior of the power tool is brought about by a periodic shutdown of the voltage in the electric motor of the electric hand tool, in that the supply voltage of the electric motor is divided into periodically repeating intervals by means of the control program of the controller.
  • FIGS. 3 to 5 show graphs of the periodically lowered voltage in the electric motor during an interval-like jerking operation of the power tool.
  • a standard variable continuous speed control is not shown in Figs. 3 to 5.
  • 3 shows the course of different voltage curves.
  • the operating element 6 of the operating switch 5 is pulled through about one third, and the voltage is steeply lowered here after the first third of the width of a period in the first region 14 of the lowering curve, and in the further course in the second region 15 of the lowering curve until the beginning 16 of a next period further lowered flat.
  • the lowering of the voltage in the second region 15 of the lowering curve is advantageously so far that the rotational speed of the electric motor is greatly lowered under applied load or the rotor comes to a stop.
  • the operating element 6 of the operating switch 5 is pulled through about two-thirds, and the voltage is here already after about the first quarter of the width of a period in the first region 14 of Lowering curve steeply lowered, and in the further course, the lowering of the voltage in the second region 15 of the lowering curve up to the beginning 16 of the next period at the same level as in the first voltage curve 13 follow.
  • the operating element 6 of the operating switch 5 is completely pulled through, and the voltage is here already steeply lowered approximately after the first fifth of the width of a period in the first region 14 of the lowering curve, and in the further course the lowering can also take place here the voltage in the second region 15 of the lowering curve to the beginning 16 of the next period at the same level as in the first and the second voltage curve 13, 17 take place.
  • the magnitude of the voltage drop in the second region 15 of the dip curve to the beginning 16 of the next period may also be coupled in proportion to the increase in voltage at the beginning of a period.
  • Fig. 4 shows such a lowering of the voltage in the second area 15 of the lowering curve 13, 17, 18.
  • the lowering threshold is raised in the lowering area 19 up to the beginning 16 of a next period with the increase of the voltage at the beginning of a period.
  • the voltage in the electric motor periodically decreases the earlier the higher the voltage determined by the operating element 6 of the operating switch 5, and this initiation of the lowering of the voltage within a respective period is slipping to the Set value of the potentiometer 7 coupled, which is determined by the control element 6.
  • Fig. 5 shows such a graph.
  • the voltage is also reduced in each case within a period in corresponding areas, wherein the width of the voltage peak 20 of the respective voltage curves 13, 17, 18 within a period with the increase of the voltage is constant.
  • a steep lowering of the voltage takes place here as well, and in the second region 15, the depression slows steadily, with the voltage running flat until the beginning 16 of a next period at a predeterminable variable voltage level.
  • the reduction of the voltage in the sinking region 19 up to the beginning of a next period can here also be coupled proportionally to the increase of the voltage at the beginning of a period. At the beginning 16 of each period there is a steep increase in the voltage.
  • three portions of a period are thus preferably provided, wherein in the first portion a portion of a respective period, the voltage with the operating element 6 of the operating switch 5 is variably adjustable, and in the second portion b a respective period, the voltage is steeply lowered, wherein the lowering of the voltage to the end of the region portion b slows down, and in the third area portion c of each period, the lowering of the voltage until the beginning of a next period is flat at the level of a predetermined remaining voltage.
  • the lowering of the voltage preferably takes place with a program of the controller of the control electronics 8.
  • the initiation of an interval-like jerking rotational movement of the power tool can also be carried out by automatic control.
  • Fig. 6 shows a graphical representation of such automatic switching from a variable continuous to a variable interval-like rotational movement of the electric motor.
  • the first part of the graph shows a current curve.
  • the current curve is determined during the activation of the release device 11 on the electric motor, and evaluated by the controller of the control electronics 8.
  • area 21 of the graphic for example, a wood screw with a variable steady speed is screwed.
  • the current curve rises steeply at the beginning 22 of the screwing operation, and during the screwing operation, the current curve in a section region 23 increases accordingly until the screw head comes into contact. If the screw head has now reached the material to be screwed on, the current curve rises sharply in a further section region 24.
  • This current increase which takes place after the path of a slight increase in the current curve during the screwing, is evaluated by the controller, at the beginning of the steep current increase 25 a program is activated, which initiates the intermittent jerking rotary motion of the power tool.
  • the second part of the graph shows a voltage curve of the interval control.
  • the beginning of the interval operation is carried out with the same voltage level as when screwing when the operating element 6 of the operating switch 5 is maintained in the same position, with the operating element 6 of the Operation switch 5, the voltage level in the first range section a of the periodic voltage reduction is variably adjustable, and thus the interval operation can be variably controlled, and therefore the interval operation is flexibly operable.
  • the voltage reduction curve of Fig. 3,4,5 causes in particular a smooth leakage of the torque of the electric motor to a low torque, whereby the transmission always remains biased in the predetermined direction of rotation, and the gearbox of the electric hand tool is thus in the interval before operation Knocking protected.
  • the voltage reduction curve of Fig. 3,4,5 causes in particular a smooth leakage of the torque of the electric motor to a low torque, whereby the transmission always remains biased in the predetermined direction of rotation, and the gearbox of the electric hand tool is thus in the interval before operation Knocking protected.
  • the control program of the controller for the electronic circuit breaker 1 can be designed so that upon activation of the release device 11, the operation of the program is carried out in the reverse manner.
  • the release device 11 may also include a shift position, whereby the interval operation can be activated directly.
  • Voltage in the electric motor and the beginning of a steep lowering of the voltage within a periodic section via the operating device of the release device 11 be adjustable, and thus an influence of an interval-like jerking rotational behavior of the power tool can be achieved in the effect.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

L'invention concerne un système de commande pour machine électrique portative, comprenant une électronique de commande (8) associée au moteur électrique (2), un module de libération (11) étant associé à l'électronique de commande (8). Lorsque le module de libération (11) n'est pas activé, un comportement en rotation, variable en continu, de l'outil électrique est obtenu, via l'élément de commande (6) de l'interrupteur de service (5) de la machine électrique portative, et lors d'une activation du module de libération (11), la tension dans le moteur électrique (2) est périodiquement réduite, ce qui permet d'obtenir un comportement en rotation en saccades par intermittence.
PCT/DE2008/000919 2007-06-04 2008-05-31 Système de commande pour machine électrique portative WO2008148375A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710025985 DE102007025985B3 (de) 2007-06-04 2007-06-04 Steuereinrichtung für ein Elektrohandwerkzeug
DE102007025985.0 2007-06-04

Publications (1)

Publication Number Publication Date
WO2008148375A1 true WO2008148375A1 (fr) 2008-12-11

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PCT/DE2008/000919 WO2008148375A1 (fr) 2007-06-04 2008-05-31 Système de commande pour machine électrique portative

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Country Link
DE (1) DE102007025985B3 (fr)
WO (1) WO2008148375A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103153548A (zh) * 2010-09-29 2013-06-12 株式会社牧田 电动工具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013108721A1 (de) 2013-08-12 2015-02-12 C. & E. Fein Gmbh Verfahren zum Steuern eines Elektrowerkzeuges mit einem elektronisch kommutierten Elektromotor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0723333A1 (fr) * 1995-01-19 1996-07-24 Marquardt GmbH Circuit pour un moteur électrique
EP0724935A2 (fr) * 1995-02-03 1996-08-07 Robert Bosch Gmbh Clé à choc et procédé pour serrer un raccord à vis avec cette clé à choc
DE19609986A1 (de) * 1995-03-24 1996-09-26 Marquardt Gmbh Verfahren und Schaltungsanordnung zum Betrieb eines Elektromotors
DE19945286A1 (de) * 1999-09-22 2001-04-05 Mets Owerke Gmbh & Co Steuerung für einen Stromwendermotor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416483A1 (de) * 1994-05-10 1995-12-21 Guenter Busch Vorrichtung und Verfahren zur Verhinderung von Flieh- und Auswurfkräften bei maschinengetriebenen Schraubwerkzeugen
EP1034615B1 (fr) * 1997-11-25 2002-02-13 Metabo-Werke GmbH & Co. Commande pour moteur a collecteur
DE19954931B4 (de) * 1999-11-16 2007-08-16 Metabowerke Gmbh Schalteinrichtung an einem von Hand führbaren, auf ein pulsierendes Drehmoment umschaltbaren Elektrowerkzeug

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0723333A1 (fr) * 1995-01-19 1996-07-24 Marquardt GmbH Circuit pour un moteur électrique
EP0724935A2 (fr) * 1995-02-03 1996-08-07 Robert Bosch Gmbh Clé à choc et procédé pour serrer un raccord à vis avec cette clé à choc
DE19609986A1 (de) * 1995-03-24 1996-09-26 Marquardt Gmbh Verfahren und Schaltungsanordnung zum Betrieb eines Elektromotors
DE19945286A1 (de) * 1999-09-22 2001-04-05 Mets Owerke Gmbh & Co Steuerung für einen Stromwendermotor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103153548A (zh) * 2010-09-29 2013-06-12 株式会社牧田 电动工具
EP2623267A1 (fr) * 2010-09-29 2013-08-07 Makita Corporation Outil électrique
EP2623267A4 (fr) * 2010-09-29 2014-06-18 Makita Corp Outil électrique

Also Published As

Publication number Publication date
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