EP2050112B1 - Control device, in particular in the form of an electric switch for electric hand tools - Google Patents
Control device, in particular in the form of an electric switch for electric hand tools Download PDFInfo
- Publication number
- EP2050112B1 EP2050112B1 EP07801219A EP07801219A EP2050112B1 EP 2050112 B1 EP2050112 B1 EP 2050112B1 EP 07801219 A EP07801219 A EP 07801219A EP 07801219 A EP07801219 A EP 07801219A EP 2050112 B1 EP2050112 B1 EP 2050112B1
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- European Patent Office
- Prior art keywords
- housing
- heat
- electric
- switch
- electric motor
- Prior art date
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- 239000004065 semiconductor Substances 0.000 claims abstract description 24
- 238000009833 condensation Methods 0.000 claims description 16
- 230000005494 condensation Effects 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 6
- 230000033228 biological regulation Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000032258 transport Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 6
- 238000009834 vaporization Methods 0.000 claims 4
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 230000017525 heat dissipation Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010413 gardening Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/52—Cooling of switch parts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/52—Cooling of switch parts
- H01H2009/523—Cooling of switch parts by using heat pipes
Definitions
- the invention relates to a power tool according to the preamble of patent claim 1.
- Such electrical switches find use for an electric hand tool with an electric motor, such as for a cordless and / or mains power tool.
- These power tools may be drills, grinders, saws, planers, angle grinders, or the like.
- an electrical switch for a power tool which has a housing for receiving an electrical circuit arrangement for controlling and / or regulating the electric motor.
- a circuit arrangement may be an electronic component for the control and / or regulation of the rotational speed of the electric motor, for example by pulse width modulation.
- the circuit located in the housing now again contains at least one component, such as a power semiconductor, a power transistor, a MOS-FET, a triac o. The like., Which serves for the corresponding control and / or regulation of the flowing through the component to the electric motor electrical load current.
- the component Due to its function as a power component, the component generates a power loss in the form of heat, which is dissipated from the housing. Likewise, other parts of the circuit can generate heat loss. To guide this heat is a heat sink located on the outside of the housing. It has now been found that in some cases the heat dissipation that can be achieved is not sufficient. This can especially in a high-power switch for DC motors in power tools to be the case, for example, in power tools that work with lithium-ion batteries. It is obvious that in such cases, the reliability of the switch and thus also of the power tool suffers.
- a power tool with an electric motor wherein a control circuit is provided with a housing located in the Elcktrozeugs power semiconductor for controlling the electric motor.
- the power semiconductor communicates with a heat sink to dissipate heat.
- a heat sink for dissipating heat from the power semiconductor is arranged.
- the electrical switch has a fan for cooling the heat sink.
- the shows US 2006/091858 A1 a power tool with a battery, wherein in the housing of the battery, a control circuit is located with a power semiconductor.
- the power semiconductor is connected to a heat sink in thermally conductive connection.
- a heat pipe or a fan can be provided for the removal of heat from the heat sink in the battery.
- the invention has for its object to improve the removal of heat from the housing of the electrical switch.
- the heat generated at the power semiconductor of the switch heat efficiently and quickly dissipated and can be transported in a region of the power tool, where the heat is dissipated by the existing engine cooling air flow.
- a means for heat conduction is on the one hand with the housing of the electrical switch and / or with the heat-generating component, in particular with the power semiconductor in the housing, and on the other hand with a cooled area in combination.
- the cooled area is located outside and / or separately from the housing and in particular associated with the electrical switch.
- the means for heat conduction consists of a heat pipe in the manner of a heat pipe, whereby the heat can be dissipated particularly efficiently.
- the heat pipe has an evaporation region at one end and a condensation region at the other end.
- the heat pipe is closed at one end with an evaporator plate and at the other end with a condensation plate.
- a fluid is further included, so that the fluid under phase change, under evaporation and condensation, heat between the evaporation region and the condensation region transported.
- the reliability of the switch and thus the reliability of the power tool is increased.
- the control and / or regulation of the freewheel for example by diodes
- the torque for example by current control for the electric motor, or other characteristics, such as automatic shutdown, automatic control , electronic braking, electronic soft start of the electric motor o. The like., To be.
- an increase in the reliability is achieved with the help of the heat dissipation of the invention of the circuit arrangement.
- the heat pipe can be connected mechanically and / or thermally to the power semiconductor.
- the one end of the heat pipe is attached in the manner of a housing attachment to the housing in the region of the power semiconductor, for example, the simple installation by means of a screw half. It makes sense for the sake of compactness of the arrangement that the housing attachment comprises the standing in thermal contact with the power semiconductor evaporator plate.
- the heat pipe can be designed in the manner of a flexible and / or preformed hose. Whose course can then be adjusted according to the space between the housing and the cooled area corresponding to the housing guide in the electrical tool, so the circumstances of the power tool housing accordingly. As a result, the heat pipe needs no additional space in the power tool.
- the cooled area can be arranged at an appropriate point in and / or on the power tool. It is particularly favorable if this is located in the region of the engine cooling air flow. For a compact design, it is advisable that the condensation plate is arranged in the cooled area, in which case the motor cooling air flow flows around the condensation plate.
- a heat pipe is mechanically and / or thermally connected to the power semiconductor, so that the heat pipe transports the heat in the range of engine cooling air flow.
- heatpipes heat can be transported very efficiently and quickly from one warm place to another cooler place, which is why these heatpipes are sometimes called thermal superconductors.
- the heat transfer can amount to about 100 to 10,000 times in terms of the amount of heat and the speed compared to a geometrically identical component made of solid copper as a heat sink.
- the advantages achieved by the invention are, in particular, that can open up new, higher power ranges due to the improved heat dissipation. Furthermore, it is a passive cooling system, so that no energy for the operation of the means for cooling is needed, which is an advantage especially when used in battery-powered tools. Finally, the use of smaller sized electronic components and lower specified power semiconductors is possible, resulting in cost savings. In addition, can be dispensed with the need for today's switches and expensive heat sink. With the aid of the invention, a direct current (DC) high-power circuit breaker for use in hand-held power tools of the upper power segment is advantageously created, which is particularly suitable for power tools that work with lithium-ion batteries.
- DC direct current
- a housing half shell 2 for a power tool 1 is shown in such a way that the present in the power tool housing of the power tool 1 electric motor 3 with fan wheel 10 which generates the cooling air flow for the electric motor 3, and the electrical switch 4 can be seen.
- the power tool 1 may be a battery and / or a mains power tool, for example, a drill, a grinder, a saw, a planer, an angle grinder o. The like. Act.
- the switch 4 has a housing 5, which serves for receiving a movable switch contact and a fixed contact comprehensive, not shown contact system.
- the housing 4 is received in the Gezzauseschschale 2 such that an arranged on the housing 5, manually movable by the user actuating member 6 protrudes from the handle on the housing half shell 2.
- the actuator 6 acts on the switching contact for switching the contact system, so that the power tool 1 by means of the actuator 6 and / or can be switched off.
- On the housing 5 are still electrical connections 7 for connecting the switch 4 with a power source, such as a battery, and not visible, further electrical connections for connecting the switch 4 to the electric motor.
- the circuit serves as control electronics for speed change of the electric motor 3.
- the circuit arrangement at least one associated, heat-generating power device, such as a power semiconductor, a power transistor , a MOS-FET, a triac o. The like., On, whereby a corresponding control and / or regulation of the flowing through the power component to the electric motor 3 electrical load current takes place.
- the cooled area 9 is arranged in and / or on the power tool 1 at a suitable location. It is particularly efficient when the cooled region 9 is located in the engine cooling air flow for the electric motor 3 of the power tool 1, by the end of the means 8 for heat conduction in the vicinity of the only schematically indicated fan wheel 10 on the electric motor 3 ends away from the switch 4.
- the switch 4 facing the end of the means 8 for heat conduction also directly with the heat-generating Component, in particular with the power semiconductor located in the housing 5 are in communication.
- the means 8 for heat conduction consists of a heat pipe 11 in the manner of a heat pipe.
- the heat pipe 11 has at one end an evaporation region 12, which may consist of a heat pipe 11 final evaporator plate, and at the other end a condensation region 13, which may consist of a heat pipe 11 final, fan-like designed condensation plate on.
- a fluid is contained, so that the fluid in known operation with phase change, ie by evaporation of the evaporator plate 12 and by condensation on the condensation plate 13, heat between the evaporator plate 12 and the condensation plate 13 transported.
- the heat pipe 11 is connected mechanically and / or thermally to the power semiconductor located in the housing 5.
- one end of the heat pipe 11 is attached in the manner of a housing attachment 14 on the housing 5 in the region of the power semiconductor.
- a screw 15 can be used.
- the housing cover 14 comprises the standing in thermal contact with the power semiconductor evaporator plate 12th
- the heat pipe 11 is configured in the manner of a flexible and / or preformed hose.
- the course of the heat pipe 11 can thus be adjusted according to the available space between the housing 5 and the cooled area 9, that is according to the housing guide in the housing half-shell 2 of the power tool 1.
- the heat pipe 11 is approximately S-shaped.
- the invention is not limited to the described and illustrated embodiment. Rather, it also encompasses all expert developments within the scope of the invention defined by the claims.
- the invention can be used not only in power tool switches as a high-performance switch in AC and / or DC power tools, but can also be found on other switches, such as those for household electrical appliances, electrical gardening equipment, machine tools o.
- the invention can also with control devices or without housing, for example, for the power electronics of the power tool, for motor vehicles o. The like., Use.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
- Manipulator (AREA)
- Control Of Direct Current Motors (AREA)
- Thermally Actuated Switches (AREA)
Abstract
Description
Die Erfindung betrifft ein Elektrowerkzeug nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a power tool according to the preamble of patent claim 1.
Derartige elektrische Schalter finden für ein Elektrohandwerkzeug mit einem Elektromotor, wie für ein Akku- und/oder Netz-Elektrowerkzeug, Verwendung. Bei diesen Elekcrowerkzeugen kann es sich um Bohrmaschinen, Schleifer, Sägen, Hobel, Winkelschleifer o. dgl. handeln.Such electrical switches find use for an electric hand tool with an electric motor, such as for a cordless and / or mains power tool. These power tools may be drills, grinders, saws, planers, angle grinders, or the like.
Aus der
Das Bauteil erzeugt aufgrund seiner Funktion als Leistungsbauteil eine Verlustleistung in Form von Wärme, die aus dem Gehäuse abzuführen ist. Ebenso können sonstige Teile der Schaltungsanordnung Verlustwärme erzeugen. Zur Anführung dieser Wärme dient ein an der Außenseite des Gehäuses befindlicher Kühlkörper. Es hat sich nun herausgestellt, daß in manchen Fällen die dadurch erzielbare Wärmeabfuhr nicht genügend ist. Dies kann insbesondere bei einem Hochleistungsschalter für Gleichstrommotoren in Elektrowerkzeugen der Fall sein, und zwar beispielsweise bei Elektrowerkzeugen, die mit Lithium-Ionen-Akkus arbeiten. Es liegt auf der Hand, daß in solchen Fällen die Betriebssicherheit des Schalters und damit auch des Elektrowerkzeugs leidet.Due to its function as a power component, the component generates a power loss in the form of heat, which is dissipated from the housing. Likewise, other parts of the circuit can generate heat loss. To guide this heat is a heat sink located on the outside of the housing. It has now been found that in some cases the heat dissipation that can be achieved is not sufficient. This can especially in a high-power switch for DC motors in power tools to be the case, for example, in power tools that work with lithium-ion batteries. It is obvious that in such cases, the reliability of the switch and thus also of the power tool suffers.
Aus der
Der Erfindung liegt die Aufgabe zugrunde, die Abführung der Wärme aus dem Gehäuse des elektrischen Schalters zu verbessern. Insbesondere soll in diesem Zusammenhang nach Lösungen gesucht werden, wie die am Leistungshalbleiter des Schalters anfallende Wärme effizient und schnell abgeführt und in einen Bereich des Elektrowerkzeuges transportiert werden kann, wo die Wärme dann durch den vorhandenen Motor-Kühlluftstrom abgeführt wird.The invention has for its object to improve the removal of heat from the housing of the electrical switch. In particular, to be sought in this context for solutions, as the heat generated at the power semiconductor of the switch heat efficiently and quickly dissipated and can be transported in a region of the power tool, where the heat is dissipated by the existing engine cooling air flow.
Diese Aufgabe wird bei einem gattungsgemäßen Elektrowerkzeug durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved in a generic power tool by the characterizing features of claim 1.
Bei dem erfindungsgemäßen Elektrowerkzeug steht ein Mittel zur Wärmeleitung einerseits mit dem Gehäuse des elektrischen Schalters und/oder mit dem wärmeerzeugenden Bauteil, insbesondere mit dem im Gehäuse befindlichen Leistungshalbleiter, und andererseits mit einem gekühlten Bereich in Verbindung. Der gekühlte Bereich ist außerhalb und/oder separat vom Gehäuse befindlich sowie insbesondere dem elektrischen Schalter zugeordnet. Das Mittel zur Wärmeleitung besteht aus einem Wärmerohr in der Art einer Heatpipe, womit die Wärme besonders effizient abgeführt werden kann. Das Wärmerohr weist am einen Ende eine Verdampfungsregion sowie am anderen Ende eine Kondensationsregion auf. Zweckmäßigerweise ist hierzu das Wärmerohr an dem einen Ende mit einer Verdampferplatte sowie an dem anderen Ende mit einer Kondensationsplatte abgeschlossen. Im Wärmerohr ist weiterhin ein Fluid enthalten, derart daß das Fluid unter Phasenänderung, und zwar unter Verdampfung sowie Kondensation, Wärme zwischen der Verdampfungsregion sowie der Kondensationsregion transportiert. Vorteilhafterweise wird mit Hilfe der Erfindung die Betriebssicherheit des Schalters und damit auch die Betriebssicherheit des Elektrowerkzeugs gesteigert. Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.In the power tool according to the invention, a means for heat conduction is on the one hand with the housing of the electrical switch and / or with the heat-generating component, in particular with the power semiconductor in the housing, and on the other hand with a cooled area in combination. The cooled area is located outside and / or separately from the housing and in particular associated with the electrical switch. The means for heat conduction consists of a heat pipe in the manner of a heat pipe, whereby the heat can be dissipated particularly efficiently. The heat pipe has an evaporation region at one end and a condensation region at the other end. Appropriately, for this purpose, the heat pipe is closed at one end with an evaporator plate and at the other end with a condensation plate. In the heat pipe, a fluid is further included, so that the fluid under phase change, under evaporation and condensation, heat between the evaporation region and the condensation region transported. Advantageously, with the aid of the invention, the reliability of the switch and thus the reliability of the power tool is increased. Further embodiments of the invention are the subject of the dependent claims.
Weitere Einsatzfälle im Elektrowerkzeug für eine solche Schaltungsanordnung, insbesondere in der Art eines Elektronikbausteins, können die Steuerung und/oder Regelung des Freilaufs, beispielsweise durch Dioden, des Drehmoments, beispielsweise durch Stromregelung für den Elektromotor, oder anderer Kenngrößen, wie automatische Abschaltung, automatische Regelung, elektronische Bremsung, elektronischer Sanftanlauf des Elektromotors o. dgl., sein. Auch in solchen Einsatzfällen wird mit Hilfe der erfindungsgemäßen Wärmeabfuhr von der Schaltungsanordnung eine Steigerung der Ausfallsicherheit erreicht.Further applications in the power tool for such a circuit, in particular in the form of an electronic module, the control and / or regulation of the freewheel, for example by diodes, the torque, for example by current control for the electric motor, or other characteristics, such as automatic shutdown, automatic control , electronic braking, electronic soft start of the electric motor o. The like., To be. Even in such applications, an increase in the reliability is achieved with the help of the heat dissipation of the invention of the circuit arrangement.
Das Wärmerohr kann mechanisch und/oder thermisch am Leistungshalbleiter angebunden sein. In einfacher Bauweise ist das eine Ende des Wärmerohrs in der Art eines Gehäuseaufsatzes am Gehäuse im Bereich des Leistungshalbleiters befestigt, beispielsweise der einfachen Montage halber mittels einer Schraube. Es bietet sich zwecks Kompaktheit der Anordnung an, daß der Gehäuseaufsatz die in thermischen Kontakt mit dem Leistungshalbleiter stehende Verdampferplatte umfaßt.The heat pipe can be connected mechanically and / or thermally to the power semiconductor. In a simple construction, the one end of the heat pipe is attached in the manner of a housing attachment to the housing in the region of the power semiconductor, for example, the simple installation by means of a screw half. It makes sense for the sake of compactness of the arrangement that the housing attachment comprises the standing in thermal contact with the power semiconductor evaporator plate.
Das Wärmerohr läßt sich in der Art eines flexiblen und/oder vorgeformten Schlauchs ausgestalten. Dessen Verlauf kann dann entsprechend dem Bauraum zwischen dem Gehäuse und dem gekühlten Bereich entsprechend der Gehäuseführung im Elektrowerlezeug, also den Gegebenheiten des Elektrowerkzeug-Gehäuses entsprechend, angepaßt sein. Dadurch benötigt das Wärmerohr keinen zusätzlichen Platz im Elektrowerkzeug.The heat pipe can be designed in the manner of a flexible and / or preformed hose. Whose course can then be adjusted according to the space between the housing and the cooled area corresponding to the housing guide in the electrical tool, so the circumstances of the power tool housing accordingly. As a result, the heat pipe needs no additional space in the power tool.
Der gekühlte Bereich läßt sich an zweckmäßiger Stelle im und/oder am Elektrowerkzeug anordnen. Besonders günstig ist es, wenn dieser im Bereich des Motor-Kühlluftstroms befindlich ist. Zwecks kompakter Ausgestaltung bietet es sich an, daß die Kondensationsplatte im gekühlten Bereich angeordnet ist, wobei dann der Motor-Kühlluftstrom die Kondensationsplatte umfließt.The cooled area can be arranged at an appropriate point in and / or on the power tool. It is particularly favorable if this is located in the region of the engine cooling air flow. For a compact design, it is advisable that the condensation plate is arranged in the cooled area, in which case the motor cooling air flow flows around the condensation plate.
Zusammenfassend läßt sich für eine besonders bevorzugte Ausgestaltung feststellen, daß eine Heatpipe mechanisch und/oder thermisch am Leistungshalbleiter angebunden ist, derart daß die Heatpipe die Wärme in den Bereich des Motor-Kühlluftstroms transportiert. Mit Hilfe von Heatpipes läßt sich Wärme sehr effizient und schnell von einem warmen Ort zu einem anderen kühleren Ort transportieren, weshalb diese Heatpipes mitunter auch als thermische Supraleiter bezeichnet werden. Der Wärmetransport kann bezogen auf die Wärmemenge und die Geschwindigkeit das in etwa 100 bis 10.000-fache verglichen mit einem geometrisch gleichen Bauteil aus massivem Kupfer als Kühlkörper betragen.In summary, can be found for a particularly preferred embodiment that a heat pipe is mechanically and / or thermally connected to the power semiconductor, so that the heat pipe transports the heat in the range of engine cooling air flow. With the help of heatpipes heat can be transported very efficiently and quickly from one warm place to another cooler place, which is why these heatpipes are sometimes called thermal superconductors. The heat transfer can amount to about 100 to 10,000 times in terms of the amount of heat and the speed compared to a geometrically identical component made of solid copper as a heat sink.
Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß sich aufgrund der verbesserten Wärmeabfuhr neue, höhere Leistungsbereiche erschließen lassen. Desweiteren handelt es sich um ein passives Kühlsystem, so daß keine Energie für den Betrieb des Mittels zur Kühlung benötigt wird, was insbesondere beim Einsatz in akkubetriebenen Werkzeugen ein Vorteil ist. Schließlich ist auch ein Einsatz von kleiner dimensionierten elektronischen Bauteilen und niedriger spezifizierten Leistungshalbleitern möglich, was zu Kosteneinsparungen führt. Darüber hinaus kann auf den bei heutigen Schaltern notwendigen und teuren Kühlkörper verzichtet werden. Mit Hilfe der Erfindung ist vorteilhafterweise ein Gleichstrom(DC)-Hochleistungsschalter für den Einsatz in handgeführten Elektrowerkzeugen des oberen Leistungssegments geschaffen, der insbesondere für Elektrowerkzeuge, die mit Lithium-Ionen-Akkus arbeiten, geeignet ist.The advantages achieved by the invention are, in particular, that can open up new, higher power ranges due to the improved heat dissipation. Furthermore, it is a passive cooling system, so that no energy for the operation of the means for cooling is needed, which is an advantage especially when used in battery-powered tools. Finally, the use of smaller sized electronic components and lower specified power semiconductors is possible, resulting in cost savings. In addition, can be dispensed with the need for today's switches and expensive heat sink. With the aid of the invention, a direct current (DC) high-power circuit breaker for use in hand-held power tools of the upper power segment is advantageously created, which is particularly suitable for power tools that work with lithium-ion batteries.
Ein Ausführungsbeispiel der Erfindung mit verschiedenen Weiterbildungen und Ausgestaltungen ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.
Es zeigt die
- Fig.
- ein geöffnet dargestelltes Gehäuse für ein Elektrowerkzeug.
It shows the
- FIG.
- an open illustrated housing for a power tool.
In der Figur ist eine Gehäusehalbschale 2 für ein Elektrowerkzeug 1 in der Weise gezeigt, daß der im Elektrowerkzeug-Gehäuse des Elektrowerkzeugs 1 befindliche Elektromotor 3 mit Ventilatorrad 10, das den Kühlluftstrom für den Elektromotor 3 erzeugt, sowie der elektrische Schalter 4 zu sehen sind. Bei dem Elektrowerkzeug 1 kann es sich um ein Akku- und/oder ein Netz-Elektrowerkzeug, beispielsweise um eine Bohrmaschine, einen Schleifer, eine Säge, einen Hobel, einen Winkelschleifer o. dgl. handeln.In the figure, a
Der Schalter 4 weist ein Gehäuse 5 auf, das zur Aufnahme eines einen beweglichen Schaltkontakt sowie einen Festkontakt umfassenden, nicht weiter gezeigten Kontaktsystems dient. Das Gehäuse 4 ist derart in der Gehäusehalbschale2 aufgenommen, daß ein am Gehäuse 5 angeordnetes, manuell vom Benutzer bewegbares Betätigungsorgan 6 aus dem Handgriff an der Gehäusehalbschale 2 herausragt. Das Betätigungsorgan 6 wirkt auf den Schaltkontakt zur Umschaltung des Kontaktsystems ein, so daß das Elektrowerkzeug 1 mittels des Betätigungsorgans 6 ein- und/oder ausschaltbar ist. Am Gehäuse 5 befinden sich weiterhin elektrische Anschlüsse 7 zur Verbindung des Schalters 4 mit einer Energiequelle, beispielsweise mit einem Akku, sowie nicht sichtbare, weitere elektrische Anschlüsse zur Verbindung des Schalters 4 mit dem Elektromotor 3.The
Schließlich befindet sich im Gehäuse 5 des Schalters 4 eine elektrische Schaltungsanordnung zur Steuerung und/oder Regelung des Elektromotors 3. Die Schaltungsanordnung dient als Steuerelektronik zur Drehzahlveränderung des Elektromotors 3. Hierzu weist die Schaltungsanordnung wenigstens ein zugehöriges, wärmeerzeugendes Leistungsbauteil, wie einen Leistungshalbleiter, einen Leistungstransistor, einen MOS-FET, einen Triac o. dgl., auf, wodurch eine entsprechende Steuerung und/oder Regelung des durch das Leistungsbauteil zum Elektromotor 3 fließenden elektrischen Laststroms erfolgt.Finally, in the
Um die beispielsweise vom Leistungsbauteil und/oder der Schaltungsanordnung erzeugte Verlustwärme aus dem Gehäuse 5 des Schalters 4 abzuführen, steht ein Mittel 8 zur Wärmeleitung einerseits mit dem Gehäuse 5 des elektrischen Schalters 4 und andererseits mit einem dem Schalter 4 zugeordneten gekühlten Bereich 9 in Verbindung. Der gekühlte Bereich 9 ist im und/oder am Elektrowerkzeug 1 an geeigneter Stelle angeordnet. Besonders effizient ist es, wenn der gekühlte Bereich 9 im Motor-Kühlluftstrom für den Elektromotor 3 des Elektrowerkzeugs 1 befindlich ist, indem das dem Schalter 4 abgewandte Ende des Mittels 8 zur Wärmeleitung in der Nähe des lediglich schematisch angedeuteten Ventilatorrads 10 am Elektromotor 3 endet. Selbstverständlich kann das dem Schalter 4 zugewandte Ende des Mittels 8 zur Wärmeleitung auch direkt mit dem wärmeerzeugenden Bauteil, insbesondere mit dem im Gehäuse 5 befindlichen Leistungshalbleiter in Verbindung stehen.In order to dissipate the heat loss generated, for example, from the power component and / or the circuit arrangement of the
Wie man der Fig. weiter entnimmt, besteht das Mittel 8 zur Wärmeleitung aus einem Wärmerohr 11 in der Art einer Heatpipe. Das Wärmerohr 11 weist am einen Ende eine Verdampfungsregion 12, die aus einer das Wärmerohr 11 abschließenden Verdampferplatte bestehen kann, sowie am anderen Ende eine Kondensationsregion 13, die aus einer das Wärmerohr 11 abschließenden, fächerartig ausgestalteten Kondensationsplatte bestehen kann, auf. Im Wärmerohr 11 ist ein Fluid enthalten, derart daß das Fluid in bekannter Funktionsweise unter Phasenänderung, also durch Verdampfung an der Verdampferplatte 12 sowie durch Kondensation an der Kondensationsplatte 13, Wärme zwischen der Verdampferplatte 12 sowie der Kondensationsplatte 13 transportiert.As shown in FIG. Further, the means 8 for heat conduction consists of a heat pipe 11 in the manner of a heat pipe. The heat pipe 11 has at one end an
Das Wärmerohr 11 ist mechanisch und/oder thermisch an dem im Gehäuse 5 befindlichen Leistungshalbleiter angebunden. Hierzu ist das eine Ende des Wärmerohrs 11 in der Art eines Gehäuseaufsatzes 14 am Gehäuse 5 im Bereich des Leistungshalbleiters befestigt. Zur Befestigung läßt sich eine Schraube 15 verwenden. Der Gehäuseaufsatz 14 umfaßt die in thermischen Kontakt mit dem Leistungshalbleiter stehende Verdampferplatte 12.The heat pipe 11 is connected mechanically and / or thermally to the power semiconductor located in the
Das Wärmerohr 11 ist in der Art eines flexiblen und/oder vorgeformten Schlauchs ausgestaltet. Der Verlauf des Wärmerohrs 11 läßt sich so entsprechend dem verfügbaren Bauraum zwischen dem Gehäuse 5 und dem gekühlten Bereich 9, also entsprechend der Gehäuseführung in der Gehäusehalbschale 2 des Elektrowerkzeugs 1, anpassen. Vorliegend ist, wie man der Fig. entnehmen kann, das Wärmerohr 11 in etwa S-förmig ausgebildet.The heat pipe 11 is configured in the manner of a flexible and / or preformed hose. The course of the heat pipe 11 can thus be adjusted according to the available space between the
Die Erfindung ist nicht auf das beschriebene und dargestellte Ausführungsbeispiel beschränkt. Sie umfaßt vielmehr auch alle fachmännischen Weiterbildungen im Rahmen der durch die Patentansprüche definierten Erfindung. So kann die Erfindung nicht nur bei Elektrowerkzeugschaltern als Hochleistungsschalter in AC- und/oder DC-Elektrowerkzeugen eingesetzt werden, sondern kann auch an anderen Schaltern, beispielsweise solchen für Elektrohaushaltsgeräte, Elektrogartengeräte, Werkzeugmaschinen o. dgl., Verwendung finden. Desgleichen läßt sich die Erfindung auch an Steuergeräten mit oder ohne Gehäuse, beispielsweise für die Leistungselektronik des Elektrowerkzeugs, für Kraftfahrzeuge o. dgl., einsetzen.The invention is not limited to the described and illustrated embodiment. Rather, it also encompasses all expert developments within the scope of the invention defined by the claims. Thus, the invention can be used not only in power tool switches as a high-performance switch in AC and / or DC power tools, but can also be found on other switches, such as those for household electrical appliances, electrical gardening equipment, machine tools o. Likewise, the invention can also with control devices or without housing, for example, for the power electronics of the power tool, for motor vehicles o. The like., Use.
- 1:1:
- Elektrowerkzeugpower tool
- 2:2:
- GehäusehalbschaleHousing shell
- 3:3:
- Elektromotorelectric motor
- 4:4:
- (elektrischer) Schalter(electrical) switch
- 5:5:
- Gehäuse (von Schalter)Housing (from switch)
- 6:6:
- Betätigungsorganactuator
- 7:7:
- (elektrischer) Anschluß (des Schalters)(electrical) connection (of the switch)
- 8:8th:
- Mittel zur WärmeleitungMeans for heat conduction
- 9:9:
- gekühlter Bereichrefrigerated area
- 10:10:
- Ventilatorrad (an Elektromotor)Fan wheel (to electric motor)
- 11:11:
- Wärmerohrheat pipe
- 12:12:
- Verdampfungsregion / VerdampferplatteEvaporation region / evaporator plate
- 13:13:
- Kondensationsregion / KondensationsplatteCondensation region / condensation plate
- 14:14:
- Gehäuseaufsatzhousing attachment
- 15:15:
- Schraubescrew
Claims (4)
- Electric tool, such as a battery-operated and/or mains-powered electric tool, for example drills, grinding machines, saws, planes, angle-grinders or the like, comprising an electric motor (3) and an electric switch (4) with a housing (5) for mounting a movable switching contact as well as a fixed contact and for mounting at least one heat-generating component, such as a power transistor, a MOSFET, a triac or the like, which is arranged in particular in an electric circuit arrangement, which is used for controlling and/or regulating the electric motor (3) for example by the corresponding control and/or regulation of the electrical load current flowing through the component to the electric motor (3), wherein a means (8) is provided for heat conduction, which is connected on the one hand to the housing (5) of the electric switch (4) and/or to the heat-generating component, in particular to the power semiconductor located in the housing (5), and on the other hand to a cooled area (9) located In and/or on the electric tool (1) which is assigned in particular to the switch (4), characterised in that the means (8) for heat conduction consists of a thermal pipe (11) in the form of a heating pipe, in that the heating pipe (11) comprises at a first end a vaporisation region (12) and at the other end a condensation region (13), and in particular is closed off at the first end by a vaporisation plate and at the other end by a condensation plate, and in that also the heating pipe (11) contains a fluid, such that with a change in phase the fluid transports heat between the vaporisation region (12) and the condensation region (13).
- Electric tool according to claim 1, characterised in that the heating pipe (11) is joined mechanically and/or thermally to the power semiconductor, in that preferably one end of the heating pipe (11) is secured in the manner of a housing fitting (14) onto the housing (5) in the region of the power semiconductor, in particular by means of a screw (15), and in that also preferably the housing fitting (14) comprises the vaporisation plate (12) which is in thermal contact with the power semiconductor.
- Electric tool according to claim 1 or 2, characterised in that the heating pipe (11) is designed in the form of a flexible and/or preshaped hose, the path of which is preferably adjusted to the structural space between the housing (5) and the cooled area (9), in particular to the housing guide in the electric tool (1).
- Electric tool according to any one of claims 1 to 3, characterised in that the cooled area (9) is located in and/or on the electric tool (1) in the region of the motor cooling airflow for the electric motor (3).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006037446 | 2006-08-10 | ||
PCT/DE2007/001408 WO2008017297A1 (en) | 2006-08-10 | 2007-08-09 | Control device, in particular in the form of an electric switch for electric hand tools |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2050112A1 EP2050112A1 (en) | 2009-04-22 |
EP2050112B1 true EP2050112B1 (en) | 2010-07-14 |
Family
ID=38596635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07801219A Active EP2050112B1 (en) | 2006-08-10 | 2007-08-09 | Control device, in particular in the form of an electric switch for electric hand tools |
Country Status (6)
Country | Link |
---|---|
US (1) | US7764502B2 (en) |
EP (1) | EP2050112B1 (en) |
JP (1) | JP5231414B2 (en) |
AT (1) | ATE474321T1 (en) |
DE (2) | DE102007037125A1 (en) |
WO (1) | WO2008017297A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US9318932B2 (en) | 2010-06-14 | 2016-04-19 | Black & Decker Inc. | Control unit for a power tool |
US9450471B2 (en) | 2012-05-24 | 2016-09-20 | Milwaukee Electric Tool Corporation | Brushless DC motor power tool with combined PCB design |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102009029506A1 (en) * | 2009-09-16 | 2011-03-24 | Robert Bosch Gmbh | Switch-board unit for installation in a handle of a hand-held tool |
JP5418119B2 (en) | 2009-09-30 | 2014-02-19 | 日立工機株式会社 | Work machine |
DE102011077442A1 (en) * | 2011-06-14 | 2012-12-20 | Robert Bosch Gmbh | Hand tool |
US9770821B2 (en) | 2011-10-06 | 2017-09-26 | Husqvarna Ab | Battery operated handheld power tool |
FR2999464A1 (en) * | 2012-12-19 | 2014-06-20 | Bosch Gmbh Robert | Portable machine tool e.g. angle grinder, has housing unit partially surrounding drive unit and/or electronic unit, transport unit to transport thermal energy into housing unit, and cooling unit to cool drive unit and/or electronic unit |
DE102013204975A1 (en) * | 2013-03-21 | 2014-10-09 | Robert Bosch Gmbh | Hand tool |
US9787159B2 (en) | 2013-06-06 | 2017-10-10 | Milwaukee Electric Tool Corporation | Brushless DC motor configuration for a power tool |
DE102013215821A1 (en) * | 2013-08-09 | 2015-02-12 | Robert Bosch Gmbh | Hand tool with an electric motor drive as a direct drive |
EP3292959B1 (en) | 2016-02-12 | 2021-06-16 | Black & Decker Inc. | Electronic braking for a power tool having a brushless motor |
US10875170B2 (en) * | 2017-09-13 | 2020-12-29 | Makita Corporation | Electric power tool |
JP7066542B2 (en) * | 2018-06-20 | 2022-05-13 | 株式会社マキタ | Power tools and portable circular saws |
JP7066543B2 (en) * | 2018-06-20 | 2022-05-13 | 株式会社マキタ | Power tools |
US11539234B2 (en) | 2020-06-04 | 2022-12-27 | Milwaukee Electric Tool Corporation | Power supply with high and low power operating modes |
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DE3045610A1 (en) * | 1980-04-04 | 1982-08-19 | Milwaukee Electric Tool Corp., 53005 Brookfield, Wis. | Speed control for electric hand drill - uses triac mounted on heat sink in motor cooling air path |
DE19508925A1 (en) | 1995-03-13 | 1996-09-19 | Marquardt Gmbh | Electrical switch, in particular for electrical hand tools |
JP4290232B2 (en) * | 1997-02-24 | 2009-07-01 | 富士通株式会社 | Heat sink and information processing device using it |
US6692864B1 (en) * | 1999-07-05 | 2004-02-17 | Matsushita Electric Industrial Co., Ltd. | Battery pack and power tool using the same |
US6049460A (en) * | 1999-07-19 | 2000-04-11 | Eaton Corporation | Trigger actuated control having supplemental heat sink |
US6237698B1 (en) * | 1999-12-10 | 2001-05-29 | Black & Decker Inc. | Terminal protection system for portable power tools |
KR100915778B1 (en) * | 2000-11-03 | 2009-09-04 | 에스엠씨 일렉트리칼 프로덕츠, 인크 | Microdrive |
US7424907B2 (en) * | 2002-10-01 | 2008-09-16 | Enertron, Inc. | Methods and apparatus for an integrated fan pump cooling module |
US7157882B2 (en) * | 2002-11-22 | 2007-01-02 | Milwaukee Electric Tool Corporation | Method and system for battery protection employing a selectively-actuated switch |
US7589500B2 (en) * | 2002-11-22 | 2009-09-15 | Milwaukee Electric Tool Corporation | Method and system for battery protection |
NL1024744C2 (en) * | 2003-11-07 | 2005-05-10 | Capax B V | Switch unit with ventilation. |
US7292438B2 (en) * | 2005-02-25 | 2007-11-06 | Delta Electronics, Inc. | Liquid-cooling heat dissipation module |
GB0723914D0 (en) * | 2007-12-07 | 2008-01-23 | Johnson Electric Sa | A power tool |
-
2007
- 2007-08-07 DE DE102007037125A patent/DE102007037125A1/en not_active Withdrawn
- 2007-08-09 WO PCT/DE2007/001408 patent/WO2008017297A1/en active Application Filing
- 2007-08-09 JP JP2009523147A patent/JP5231414B2/en active Active
- 2007-08-09 DE DE502007004414T patent/DE502007004414D1/en active Active
- 2007-08-09 AT AT07801219T patent/ATE474321T1/en active
- 2007-08-09 EP EP07801219A patent/EP2050112B1/en active Active
-
2009
- 2009-02-05 US US12/365,945 patent/US7764502B2/en active Active
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9318932B2 (en) | 2010-06-14 | 2016-04-19 | Black & Decker Inc. | Control unit for a power tool |
US9450471B2 (en) | 2012-05-24 | 2016-09-20 | Milwaukee Electric Tool Corporation | Brushless DC motor power tool with combined PCB design |
US9774229B1 (en) | 2012-05-24 | 2017-09-26 | Milwaukee Electric Tool Corporation | Brushless DC motor power tool with combined PCB design |
Also Published As
Publication number | Publication date |
---|---|
EP2050112A1 (en) | 2009-04-22 |
ATE474321T1 (en) | 2010-07-15 |
US20090213545A1 (en) | 2009-08-27 |
DE502007004414D1 (en) | 2010-08-26 |
JP2010500853A (en) | 2010-01-07 |
DE102007037125A1 (en) | 2008-04-03 |
JP5231414B2 (en) | 2013-07-10 |
US7764502B2 (en) | 2010-07-27 |
WO2008017297A1 (en) | 2008-02-14 |
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