EP1431006B1 - Betriebsverfahren und Kühleinrichtung für den Motor eines Elektrowerkzeugs - Google Patents

Betriebsverfahren und Kühleinrichtung für den Motor eines Elektrowerkzeugs Download PDF

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Publication number
EP1431006B1
EP1431006B1 EP03104751.7A EP03104751A EP1431006B1 EP 1431006 B1 EP1431006 B1 EP 1431006B1 EP 03104751 A EP03104751 A EP 03104751A EP 1431006 B1 EP1431006 B1 EP 1431006B1
Authority
EP
European Patent Office
Prior art keywords
load
motor
speed
engine
power tool
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.)
Expired - Lifetime
Application number
EP03104751.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1431006A2 (de
EP1431006A3 (de
Inventor
Frank Fritsch
Hermann Schuster
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP1431006A2 publication Critical patent/EP1431006A2/de
Publication of EP1431006A3 publication Critical patent/EP1431006A3/de
Application granted granted Critical
Publication of EP1431006B1 publication Critical patent/EP1431006B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B25F5/008—Cooling means
    • 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
    • Y10S388/923—Specific feedback condition or device
    • Y10S388/934—Thermal condition
    • 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 operating method for the motor of a power tool z. B. a rotary hammer whose idle operating speed is adjusted by a control electronics to a value that is equal to or slightly above a selected working speed. Moreover, the invention relates to a power tool with device features for implementing this method of operation.
  • the service life and the operational readiness of the motor of a power tool depend crucially on the engine temperature. Excessive engine temperature can cause the engine to run for a certain amount of time while it is cooling down. During operation, the temperature of the motor should therefore not exceed a certain value. The engine temperature increases the higher the load torque that must be applied by the engine. On the other hand, the temperature drops when the engine is idling. The cooling is better at high speeds due to the increased air flow.
  • the working speed is the speed of the motor under load; It is determined by the application process or specific conditions of use. If a very high torque has to be applied by the engine, the engine speed drops due to the natural load characteristic of the engine (cf. Fig. 3 ).
  • the operating idle speed must not be far above the working speed for convenient operation of the power tool. This would z. B. disturbing effect on rotary hammers when the tool is discontinued and then re-attached. There should also be no large fluctuations in the idle operating speed, as they also have a disturbing effect.
  • the idle running speed of the engine is therefore always limited to a favorable level only slightly above the selected working speed.
  • an operating method for the motor of a power tool whose idle operating speed is adjusted by control electronics to a value equal to a selected operating speed, the motor being operated for cooling at a predetermined increased idling speed, if no load torque is applied to the motor acts.
  • a power tool comprises an electronic control unit for the speed of its engine, the operating idle speed is set to a value which is equal to a selected operating speed, and a time measuring device, after a definable idle time ein Trigger signal outputs to the control electronics, to increase the speed of the engine to a suitable, suitable for cooling, predetermined, increased idle speed. It is possible that the time measuring device immediately emits the trigger signal, ie, that no time delay occurs and the engine is switched immediately after reaching the idle speed to the increased idle speed.
  • the engine is preferably operated after a predefinable idle time, during which the engine runs at the idle operating speed, with the predetermined increased idling speed.
  • the idling operation is preferably determined by measuring the motor current or the torque of the motor. It is also advantageous to determine the idle time as a function of the previous load on the engine. In this case, the idle time is shortened if the engine was previously operated in overload, and it is switched to the working speed as soon as the engine is loaded with a torque that is above the idling torque.
  • the increased idle speed is also set as described above, if the engine was switched off and on again.
  • the engine after the engine is turned on, it will switch to the increased idle speed after an idle time, which may depend on the previous load on the engine, if no load torque is required from the engine. It is also possible that immediately after the engine is switched on the increased idle speed is set if no load torque is required by the engine.
  • a load measuring device which measures the motor current and thus determines the idling operation of the engine and emits an idling signal, with which the idling operation of the engine is displayed, to the time measuring device and the control electronics.
  • the load measuring device measures the operating load of the engine and outputs a load signal to the time measuring device for determining an idle time as a function of this load.
  • the time measuring device selects a shortened idling time when the load measuring device has previously measured a heavy load on the motor.
  • the control electronics immediately sets the speed of the engine to the working speed when the idle signal indicates that the engine is not idling. Thus, always a comfortable operation guaranteed.
  • the control electronics adjust the speed of the motor as described above when the engine is turned off and on again.
  • the idling speed of the engine is raised to an increased idling speed.
  • the value ⁇ n by which the speed is increased may be fixed or it may depend on the load previously achieved.
  • the speed of the engine is not increased immediately, but after a certain time from the normal idle operating speed to the increased idle speed.
  • the increased idle speed is chosen as high as possible, so that an effective cooling of the engine, especially after it has been operated in overload, is possible.
  • the increased idle speed must not exceed a certain value, as otherwise damage to the power tool may occur.
  • the increased idle speed may interfere with the operation of the power tool and for certain applications.
  • the speed is therefore reduced without delay from the increased idle speed to the idle operating speed as soon as the engine torque is required, which is greater than the idling torque. The speed change thus takes place outside of the work process, so that comfortable work is always possible.
  • Fig. 1 shows the course of the speed according to the invention.
  • the engine will start to operate normally until a certain time T 1 certain working torque (load moment) M 1 required.
  • the engine is no longer charged, ie the engine must now only the idle torque M L (M L ⁇ M 1 ), apply.
  • the idling torque M L is determined by the falling below a predetermined current, which is absorbed by the engine.
  • the motor is now running for a period .DELTA.T with the operation idling speed n 1, which is equal to the operating speed n is 1 or slightly higher.
  • the idle time ⁇ T is dependent on the course of the load torque before the time T 1 . In a preferred embodiment, the value of the idle time ⁇ T depends on the maximum load torque that has occurred between the last cooling and the time T 1 .
  • the speed of the engine is increased at the time T 2 of the idle operating speed n 1 by a value .DELTA.n to an increased idle speed n 2 .
  • the value ⁇ n by which the speed is increased may be predefined or dependent on the maximum load torque that occurred between the last cooling and the time T 1 .
  • the engine is now operated at the increased idle speed until a load torque M 2 is required, which is above the idling torque M L (M 2 > M L ).
  • the presence of the load torque M 2 is in turn determined by measurements of the motor current, which is recorded by the engine, or based on the rotational speed.
  • a load torque M 2 from the engine is required, which is greater than the idling torque M L.
  • the speed of the engine is therefore reduced immediately at this time T 3 to the selected operating speed n 1 .
  • the increased speed n 2 is also reduced if the power tool is turned off and turned on again and the engine is required a torque that is above the idling torque M L. That is, after Fig. 1 the engine could have been switched off at time T 3 .
  • the procedure is analogous to the above, ie, after switching on the idle time .DELTA.T is switched to an increased speed n 2 . It is also possible that immediately after switching on the increased idle speed is set.
  • the data required for determining the idling time ⁇ T eg the maximum load torque, can be stored when the engine is switched off. In Fig. 1 So the engine could have been switched on again at time T 1 .
  • the related to the operating method according to the invention functional block diagram of Fig. 2 shows the engine 1, the speed of which is set by an electronic control unit 4 by a control signal 3.
  • the control electronics 4 sets the speed to default values, which are specified via a selector switch 2.
  • the load measuring device 6 measures the load of the engine 1 and outputs an idling signal 8 and a load signal 9.
  • the idle signal 8 assumes the value "1" when the engine 1 does not have to apply a load torque, ie, the engine is idling and the value "0" if the engine 1 is loaded.
  • the load signal 9 assumes continuous values, which are dependent on the load of the motor. Based on the load signal 9 determines a time measuring device 5, the idle time .DELTA.T.
  • the idle time .DELTA.T may be predetermined, it may depend on the maximum load torque which has occurred between the last cooling and the time T 1 , or it may depend on an average load value.
  • the average load value is the average load torque that has occurred between the last and the current cooling phase.
  • the cooling phase is the period during which the engine is operated at the increased idle speed. The load value is reset after reaching the increased idle speed.
  • the time measuring device 5 starts a timer with the idling time .DELTA.T as the start time, if the idle signal 8 changes from the value "0" to "1". In Fig. 1 this takes place at time T 1 .
  • the time measuring device After expiration of the idle time .DELTA.T the time measuring device outputs a trigger signal 7 to the control electronics 4 from.
  • the control electronics 4 Upon receipt of the trigger signal 7, the control electronics 4 increases the idle operating speed n 1 at time T 2 by ⁇ n to the increased idle speed n 2 . It is also possible to dispense with a time delay, so that immediately after the idle is determined based on the idle signal 8, is switched to the increased idle speed (n 2 ).
  • Fig. 3 shows the speed-torque characteristic in the event that the engine is operated at the increased idling speed n 2 .
  • the engine is operated at the increased idle speed n 2 until the torque M is greater than or equal to an idle torque threshold M 0 .
  • the engine speed n is set to the operating speed n 1 . If the torque M exceeds a torque limit value M G , the engine is operated on its natural characteristic line 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Portable Power Tools In General (AREA)
  • Control Of Electric Motors In General (AREA)
EP03104751.7A 2002-12-18 2003-12-17 Betriebsverfahren und Kühleinrichtung für den Motor eines Elektrowerkzeugs Expired - Lifetime EP1431006B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10259372A DE10259372A1 (de) 2002-12-18 2002-12-18 Betriebsverfahren und Kühleinrichtung für den Motor eines Elektrowerkzeugs
DE10259372 2002-12-18

Publications (3)

Publication Number Publication Date
EP1431006A2 EP1431006A2 (de) 2004-06-23
EP1431006A3 EP1431006A3 (de) 2014-06-18
EP1431006B1 true EP1431006B1 (de) 2015-10-21

Family

ID=32336455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03104751.7A Expired - Lifetime EP1431006B1 (de) 2002-12-18 2003-12-17 Betriebsverfahren und Kühleinrichtung für den Motor eines Elektrowerkzeugs

Country Status (4)

Country Link
US (1) US6911793B2 (ja)
EP (1) EP1431006B1 (ja)
JP (1) JP4450612B2 (ja)
DE (1) DE10259372A1 (ja)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI115322B (fi) * 2003-09-19 2005-04-15 Vacon Oyj Energianmittaus taajuusmuuttajalla
NZ547208A (en) * 2003-10-28 2009-10-30 Ibex Ind Ltd Powered hand tool
US8657030B2 (en) * 2006-03-03 2014-02-25 Black & Decker Inc. Cordless power tool having multi-speed transmission and constant speed in light torque range
JP5050667B2 (ja) * 2007-06-05 2012-10-17 マックス株式会社 打撃工具
US8380457B2 (en) 2007-08-29 2013-02-19 Canon U.S. Life Sciences, Inc. Microfluidic devices with integrated resistive heater electrodes including systems and methods for controlling and measuring the temperatures of such heater electrodes
US7798245B2 (en) 2007-11-21 2010-09-21 Black & Decker Inc. Multi-mode drill with an electronic switching arrangement
US7770660B2 (en) 2007-11-21 2010-08-10 Black & Decker Inc. Mid-handle drill construction and assembly process
US7762349B2 (en) 2007-11-21 2010-07-27 Black & Decker Inc. Multi-speed drill and transmission with low gear only clutch
US7717191B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode hammer drill with shift lock
US7735575B2 (en) 2007-11-21 2010-06-15 Black & Decker Inc. Hammer drill with hard hammer support structure
US7717192B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode drill with mode collar
US7854274B2 (en) 2007-11-21 2010-12-21 Black & Decker Inc. Multi-mode drill and transmission sub-assembly including a gear case cover supporting biasing
US8461785B2 (en) 2010-09-14 2013-06-11 Dalwinder Singh Sidhu Speed controller for electric motor
JP6439443B2 (ja) * 2014-12-26 2018-12-19 工機ホールディングス株式会社 作業機
WO2018042389A1 (en) 2016-09-02 2018-03-08 Kongsberg Inc. Techniques for limiting electrical current provided to a motor in an electric power steering system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1097411B (it) * 1978-07-26 1985-08-31 Star Utensili Elett Dispositivo per la limitazione della coppia di un motore elettrico,particolarmente per apparecchio utensile portatile
DE3021689A1 (de) * 1980-06-10 1981-12-17 Metabowerke GmbH & Co, 7440 Nürtingen Ueberlastsicherung fuer den motor, insbesondere eines elektrohandwerkzeugs
DE3335237A1 (de) * 1983-09-29 1985-04-11 Kress-elektrik GmbH & Co, Elektromotorenfabrik, 7457 Bisingen Verfahren und vorrichtung zur regelung eines elektromotors, bei welchem die drehzahl im lastfreien leerlaufbetrieb automatisch abgesenkt wird
US4550277A (en) * 1984-09-24 1985-10-29 Black & Decker Inc. Overload detection and warning system for electric motors in power tools and the like
DE4318102A1 (de) * 1993-06-01 1994-12-08 Zahnradfabrik Friedrichshafen Verfahren zur Vermeidung von Überbeanspruchungen eines Werkstückes beim Schleifen
US5525878A (en) * 1994-09-30 1996-06-11 Itt Automotive Electrical Systems, Inc. Apparatus and method for controlling an electric motor
DE29701358U1 (de) * 1997-01-29 1997-04-17 Lässig, Lothar, 08324 Bockau Elektrowerkzeugmaschine
ES2192022T3 (es) * 1999-09-01 2003-09-16 Ramachandran Ramarathnam Util electrico portatil.

Also Published As

Publication number Publication date
DE10259372A1 (de) 2004-07-08
EP1431006A2 (de) 2004-06-23
US20040189224A1 (en) 2004-09-30
EP1431006A3 (de) 2014-06-18
JP2004195643A (ja) 2004-07-15
US6911793B2 (en) 2005-06-28
JP4450612B2 (ja) 2010-04-14

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