EP1431006A2 - Betriebsverfahren und Kühleinrichtung für den Motor eines Elektrowerkzeugs - Google Patents
Betriebsverfahren und Kühleinrichtung für den Motor eines Elektrowerkzeugs Download PDFInfo
- Publication number
- EP1431006A2 EP1431006A2 EP20030104751 EP03104751A EP1431006A2 EP 1431006 A2 EP1431006 A2 EP 1431006A2 EP 20030104751 EP20030104751 EP 20030104751 EP 03104751 A EP03104751 A EP 03104751A EP 1431006 A2 EP1431006 A2 EP 1431006A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- speed
- idle
- load
- motor
- 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.)
- Granted
Links
Images
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 engine Power tool z. B. a rotary hammer whose idle speed is set by control electronics to a value equal to or is slightly above a selected working speed. Also concerns the Invention an electric tool with installation features for implementation this operating procedure.
- the service life and operational readiness of the engine Power tools depend crucially on the engine temperature.
- One too High engine temperature can cause the engine to run for a specific Time during which it cannot be operated when it cools down. During the Operating temperature of the motor should therefore not have a certain value exceed.
- the higher the engine temperature the more the engine temperature rises Is the load torque that must be applied by the engine. against it falls the temperature 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 engine under load; it is through the Application process or certain conditions of use. Must from Engine are applied a very high moment, so the speed drops due to the natural load characteristic of the engine (see Fig. 3).
- the motor may Operating idle speed for easy operation of the power tool not far above the working speed. This would e.g. B. in rotary hammers disruptive when the tool is set down and then again is scheduled. There should also be no major fluctuations in Operating idle speed occur because they also have a disturbing effect.
- the engine idling speed is therefore always at a favorable level limited only slightly above the selected working speed.
- the invention is based, sufficient cooling of the task Motor during operation of the power tool so that failure due to overheating is prevented.
- an operating method for the engine is a Power tool provided, the operating idle speed by a Control electronics is set to a value that is equal to a selected one Working speed is, the motor for cooling with a predetermined increased idle speed is operated if no load torque on the Motor works. Accordingly, the engine stops during normal operation continuously, effectively cooled, and overheating is avoided.
- An electric tool has control electronics for the Speed of its engine, its idling speed to a value is set, which is equal to a selected working speed, and a Timing device that after a definable idle time Trigger signal to the control electronics, to increase the speed of the Engine to a predetermined, increased idling speed suitable for cooling. It is possible that the timing device immediately receives the trigger signal emits, i.e. that there is no time delay and the motor immediately after Switched to the increased idle speed when the idle speed is reached becomes.
- the engine is preferably after a specifiable idle time during which the engine with the Operating idle speed runs with the predeterminable increased idle speed operated.
- Idle operation preferably by measuring the motor current or the Torque of the engine determined. It is also advantageous in idle time To determine depending on the previous load on the engine. there the idle time is shortened if the motor was previously operated in overload, and it will switch to the working speed as soon as the engine with a Torque that is above the idle torque.
- the increased Idle speed is also set as described above if the Engine has been switched off and on again.
- the power tool there is preferably one Load measuring device is provided, which measures the motor current and thus detects the idle operation of the engine and an idle signal with which the Idle operation of the engine is displayed to the timing device and the Control electronics emits.
- the load measuring device measures the Operating load of the engine and enters depending on this load Load signal to the timing device to determine an idle time from.
- the timing device selects a shorter idle time if from the Load measuring device previously measured a heavy load on the engine has been.
- the control electronics immediately set the engine speed the working speed when the idle signal indicates that the engine is not is operated at idle. This is always convenient to use guaranteed.
- the control electronics adjust the speed of the engine described above when the engine has been switched off and on again.
- the speed when the engine is idling to an increased Idle speed increased.
- the value ⁇ n by which the speed is increased can be fixed or it can depend on the previously reached load.
- the speed of the motor is preferred not immediately, but after one certain time from the normal idling speed to the increased Idle speed increased.
- the increased idle speed is as possible chosen high, so that an effective cooling of the engine, especially after this was operated in overload, is possible.
- the increased However, idle speed should not exceed a certain value, otherwise Damage to the power tool can occur.
- the increased idle speed can, however, when operating the power tool and for certain Applications are disruptive.
- the speed is therefore without time delay reduced from the increased idling speed to the operating idling speed, as soon as a torque is required on the engine that is greater than the idling torque is.
- the speed change thus takes place outside the work process, so that comfortable working is always possible.
- Fig. 1 shows the course of the speed according to the invention.
- the engine is required to have a certain working torque (load torque) M 1 up to a certain point in time T 1 during normal work. From time T 1 , the engine is no longer loaded, ie the engine now only has to apply the idling torque M L (M L ⁇ M 1 ).
- the idling torque M L is determined by falling below a predetermined current that is consumed by the motor.
- the motor is now running for a period .DELTA.T with the operation idling speed n 1 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 occurred between the last cooling and the time T 1 .
- the speed of the engine at time T 2 is increased from the idling speed n 1 by a value ⁇ n to an increased idling speed n 2 .
- the value ⁇ n by which the speed is increased can be predefined or depend on the maximum loading torque that occurred between the last cooling and the time T 1 .
- the engine is now operated at the increased idling speed until a loading torque M 2 is demanded 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 that is absorbed by the motor or based on the speed.
- a load torque M 2 is demanded from the engine at time T 3 that is greater than the idle torque M L.
- the speed of the engine is therefore immediately reduced to the selected working speed n 1 at this time T 3 .
- the immediate reduction of the speed ensures comfortable operation of the power tool.
- the increased speed n 2 is also reduced if the power tool is switched off and on again and a torque is demanded from the motor which is above the idling torque M L. 1, the engine could also have been switched off at time T 3 .
- the procedure is analogous to the above, ie after switching on, after the idle time ⁇ T has elapsed, a switch is made to an increased speed n 2 . It is also possible that the increased idle speed is set immediately after switching on.
- the data required to determine the idle time ⁇ T for example the maximum load torque, can be saved when the engine is switched off. In Fig. 1, the motor could have been switched on again at time T 1 .
- the functional block diagram of FIG. 2 relating to the operating method according to the invention shows the motor 1, the speed of which is set by control electronics 4 by means of a control signal 3.
- the control electronics 4 sets the speed to default values that are specified via a selector switch 2.
- the load measuring device 6 measures the load on the engine 1 and emits an idle signal 8 and a load signal 9.
- the idle signal 8 assumes the value "1" if the engine 1 does not have to apply a load torque, ie the engine is idle and the value "0" if the engine 1 is loaded.
- the load signal 9 takes on continuous values which are dependent on the load on the engine. Using the load signal 9, a time measuring device 5 determines the idle time ⁇ T.
- the idle time ⁇ T can be predetermined, it can depend on the maximum load torque that occurred between the last cooling and the time T 1 , or it can depend on an average load value.
- the average load value is the average load torque that occurred between the last and the current cooling phase.
- the cooling phase is the period during which the engine is operated at the increased idling speed.
- the load value is reset after the increased idling speed has been reached.
- the timing device 5 starts a timer with the idle time ⁇ 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 emits a trigger signal 7 to the control electronics 4.
- the control electronics 4 increases the idling speed n 1 at time T 2 by ⁇ n to the increased idling speed n 2 . It is also possible to dispense with a time delay, so that the idle speed (n 2 ) is changed over immediately after idling is determined on the basis of the idle signal 8.
- the speed of the control electronics 4 becomes instantaneous at time T 3 reduced again to the idling speed n 1 .
- FIG. 3 shows the speed-torque characteristic curve in the event that the engine is operated with the increased idling speed n 2 .
- the engine is operated at the increased idling speed n 2 until the torque M is greater than or equal to an idling torque threshold value M 0 .
- the engine speed n is set to the working speed n 1 . If the torque M exceeds a torque limit value M G , the motor is operated on its natural characteristic 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)
Abstract
Description
- Fig. 1
- ein Diagramm des Drehzahlverlaufs bei Leerlauf des Motors, wobei gemäß der Erfindung die Drehzahl zu Kühlzwecken erhöht wird;
- Fig. 2
- ein Blockschaltbild eines Teils eines erfindungsgemäßen Elektrowerkzeugs; und
- Fig. 3
- die Drehzahl-Drehmoment-Kennlinie eines erfindungsgemäß betriebenen Motors.
Claims (15)
- Betriebsverfahren für den Motor (1) eines Elektrowerkzeugs, dessen Betriebsleerlaufdrehzahl durch eine Regelelektronik (4) auf einen Wert eingestellt wird, der gleich einer gewählten Arbeitsdrehzahl (n1) ist,
dadurch gekennzeichnet, dass
der Motor zur Kühlung mit einer vorgebbaren erhöhten Leerlaufdrehzahl (n2) betrieben wird, falls kein Belastungsmoment (M2) auf den Motor wirkt. - Betriebsverfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
der Motor nach einer vorgebbaren Leerlaufzeit (ΔT), während der der Motor (1) mit der Betriebsleerlaufdrehzahl läuft, auf die erhöhte Leerlaufdrehzahl (n2) umgeschaltet wird. - Betriebsverfahren nach einem der vorigen Ansprüche,
dadurch gekennzeichnet, dass
der Leerlaufbetrieb durch Messung des Motorstroms (I) des Motors (1) festgestellt wird. - Betriebsverfahren nach einem der vorigen Ansprüche,
dadurch gekennzeichnet, dass
der Leerlaufbetrieb durch Messung des Drehmoments (M) des Motors (1) festgestellt wird. - Betriebsverfahren nach einem der vorigen Ansprüche,
dadurch gekennzeichnet, dass
die Leerlaufzeit (ΔT) in Abhängigkeit der vorherigen Belastung des Motors (1) bestimmt wird. - Betriebsverfahren nach einem der vorigen Ansprüche,
dadurch gekennzeichnet, dass
die Leerlaufzeit (ΔT) verkürzt wird, falls der Motor (1) zuvor in Überlast betrieben wurde. - Betriebsverfahren nach einem der vorigen Ansprüche,
dadurch gekennzeichnet, dass
auf die Arbeitsdrehzahl (n1) umgeschaltet wird, sobald der Motor (1) mit einem Moment belastet ist, das über dem Leerlaufmoment liegt. - Betriebsverfahren nach einem der vorigen Ansprüche,
dadurch gekennzeichnet, dass
die erhöhte Leerlaufdrehzahl (n2) eingestellt wird, falls der Motor (1) aus - und wieder eingeschaltet wurde und kein Belastungsmoment auf den Motor wirkt. - Elektrowerkzeug mit Regelelektronik (4) für die Drehzahl seines Motors (1), dessen Betriebsleerlaufdrehzahl auf einen Wert eingestellt wird, der gleich einer gewählten Arbeitsdrehzahl (n1) ist,
gekennzeichnet durch
eine Regelelektronik (4) zur Erhöhung der Drehzahl des Motors auf eine zur Kühlung geeignete, vorgegebene, erhöhte Leerlaufdrehzahl (n2), falls kein Belastungsmoment (M2) auf den Motor wirkt. - Elektrowerkzeug nach Anspruch 9,
gekennzeichnet durch
eine Zeitmesseinrichtung (5), die nach Ablauf einer festlegbaren Leerlaufzeit ein Triggersignal (7) an die Regelelektronik (4) abgibt, zur Erhöhung der Drehzahl des Motors (1) auf die erhöhte Leerlaufdrehzahl (n2). - Elektrowerkzeug nach Anspruch 9 oder 10,
gekennzeichnet durch
eine Belastungsmesseinrichtung (6), die den Motorstrom zum Feststellen des Leerlaufbetriebs des Motors (1) misst und ein Leerlaufsignal (8) an die Zeitmesseinrichtung (5) und die Regelelektronik (4) abgibt. - Elektrowerkzeug nach Anspruch 11,
dadurch gekennzeichnet, dass
die Belastungsmesseinrichtung (6) die Betriebsbelastung des Motors (1) misst und in Abhängigkeit dieser Belastung ein Belastungssignal (9) an die Zeitmesseinrichtung (5) zur Bestimmung einer Leerlaufzeit (ΔT) abgibt. - Elektrowerkzeug nach Anspruch 12,
dadurch gekennzeichnet, dass
die Zeitmesseinrichtung (5) eine verkürzte Leerlaufzeit (ΔT) vorgibt, wenn von der Belastungsmesseinrichtung (6) zuvor eine starke Belastung des Motors gemessen wurde. - Elektrowerkzeug nach einem der Ansprüche 11, 12 oder 13,
dadurch gekennzeichnet, dass
die Regelelektronik (4) die Drehzahl des Motors (1) sofort auf die Arbeitsdrehzahl (n1) einstellt, wenn das Leerlaufsignal (8) anzeigt, dass der Motor nicht im Leerlauf betrieben wird. - Elektrowerkzeug nach den Ansprüchen 9 bis 14,
dadurch gekennzeichnet, dass
die Regelelektronik (4) die Drehzahl des Motors (1) auf die erhöhte Leerlaufdrehzahl (n2) einstellt, falls der Motor aus- und wieder eingeschaltet wurde und kein Belastungsmoment (M2) auf den Motor wirkt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10259372 | 2002-12-18 | ||
DE10259372A DE10259372A1 (de) | 2002-12-18 | 2002-12-18 | Betriebsverfahren und Kühleinrichtung für den Motor eines Elektrowerkzeugs |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1431006A2 true EP1431006A2 (de) | 2004-06-23 |
EP1431006A3 EP1431006A3 (de) | 2014-06-18 |
EP1431006B1 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 (de) |
EP (1) | EP1431006B1 (de) |
JP (1) | JP4450612B2 (de) |
DE (1) | DE10259372A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101678543B (zh) * | 2007-06-05 | 2011-11-02 | 美克司株式会社 | 打击工具 |
US10574173B2 (en) | 2016-09-02 | 2020-02-25 | Kongsberg Inc. | Techniques for limiting electrical current provided to a motor in an electric power steering system |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI115322B (fi) * | 2003-09-19 | 2005-04-15 | Vacon Oyj | Energianmittaus taajuusmuuttajalla |
US20070296286A1 (en) * | 2003-10-28 | 2007-12-27 | Avenell Eric G | 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 |
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 |
US7735575B2 (en) | 2007-11-21 | 2010-06-15 | Black & Decker Inc. | Hammer drill with hard hammer support structure |
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 |
US7798245B2 (en) | 2007-11-21 | 2010-09-21 | Black & Decker Inc. | Multi-mode drill with an electronic switching arrangement |
US7762349B2 (en) | 2007-11-21 | 2010-07-27 | Black & Decker Inc. | Multi-speed drill and transmission with low gear only clutch |
US7770660B2 (en) | 2007-11-21 | 2010-08-10 | Black & Decker Inc. | Mid-handle drill construction and assembly process |
US7717191B2 (en) | 2007-11-21 | 2010-05-18 | Black & Decker Inc. | Multi-mode hammer drill with shift lock |
US7717192B2 (en) | 2007-11-21 | 2010-05-18 | Black & Decker Inc. | Multi-mode drill with mode collar |
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 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4430681A (en) * | 1980-06-10 | 1984-02-07 | Metabowerke Gmbh & Co. | Overload protection arrangement for an electric motor, especially of a hand-held power tool |
EP0135613A1 (de) * | 1983-09-29 | 1985-04-03 | Kress-elektrik GmbH + Co. Elektromotorenfabrik | 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 |
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 |
Family Cites Families (3)
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 |
DE4318102A1 (de) * | 1993-06-01 | 1994-12-08 | Zahnradfabrik Friedrichshafen | Verfahren zur Vermeidung von Überbeanspruchungen eines Werkstückes beim Schleifen |
ES2192022T3 (es) * | 1999-09-01 | 2003-09-16 | Ramachandran Ramarathnam | Util electrico portatil. |
-
2002
- 2002-12-18 DE DE10259372A patent/DE10259372A1/de not_active Withdrawn
-
2003
- 2003-12-12 JP JP2003414399A patent/JP4450612B2/ja not_active Expired - Fee Related
- 2003-12-16 US US10/737,274 patent/US6911793B2/en not_active Expired - Lifetime
- 2003-12-17 EP EP03104751.7A patent/EP1431006B1/de not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4430681A (en) * | 1980-06-10 | 1984-02-07 | Metabowerke Gmbh & Co. | Overload protection arrangement for an electric motor, especially of a hand-held power tool |
EP0135613A1 (de) * | 1983-09-29 | 1985-04-03 | Kress-elektrik GmbH + Co. Elektromotorenfabrik | 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 |
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 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101678543B (zh) * | 2007-06-05 | 2011-11-02 | 美克司株式会社 | 打击工具 |
US10574173B2 (en) | 2016-09-02 | 2020-02-25 | Kongsberg Inc. | Techniques for limiting electrical current provided to a motor in an electric power steering system |
Also Published As
Publication number | Publication date |
---|---|
EP1431006B1 (de) | 2015-10-21 |
JP2004195643A (ja) | 2004-07-15 |
US6911793B2 (en) | 2005-06-28 |
US20040189224A1 (en) | 2004-09-30 |
EP1431006A3 (de) | 2014-06-18 |
JP4450612B2 (ja) | 2010-04-14 |
DE10259372A1 (de) | 2004-07-08 |
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