EP2050112B1 - Steuergerät, insbesondere in der art eines elektrischen schalters für elektrohandwerkzeuge - Google Patents

Steuergerät, insbesondere in der art eines elektrischen schalters für elektrohandwerkzeuge Download PDF

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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
Authority
EP
European Patent Office
Prior art keywords
housing
heat
electric
switch
electric 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.)
Not-in-force
Application number
EP07801219A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2050112A1 (de
Inventor
Tino Erb
Dirk Pfeiffer
Klaus Fiederer
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.)
Marquardt GmbH
Original Assignee
Marquardt 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 Marquardt GmbH filed Critical Marquardt GmbH
Publication of EP2050112A1 publication Critical patent/EP2050112A1/de
Application granted granted Critical
Publication of EP2050112B1 publication Critical patent/EP2050112B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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)
  • Control Of Direct Current Motors (AREA)
  • Thermally Actuated Switches (AREA)
  • Manipulator (AREA)
EP07801219A 2006-08-10 2007-08-09 Steuergerät, insbesondere in der art eines elektrischen schalters für elektrohandwerkzeuge Not-in-force EP2050112B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006037446 2006-08-10
PCT/DE2007/001408 WO2008017297A1 (de) 2006-08-10 2007-08-09 Steuergerät, insbesondere in der art eines elektrischen schalters für elektrohandwerkzeuge

Publications (2)

Publication Number Publication Date
EP2050112A1 EP2050112A1 (de) 2009-04-22
EP2050112B1 true EP2050112B1 (de) 2010-07-14

Family

ID=38596635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07801219A Not-in-force EP2050112B1 (de) 2006-08-10 2007-08-09 Steuergerät, insbesondere in der art eines elektrischen schalters für elektrohandwerkzeuge

Country Status (6)

Country Link
US (1) US7764502B2 (enExample)
EP (1) EP2050112B1 (enExample)
JP (1) JP5231414B2 (enExample)
AT (1) ATE474321T1 (enExample)
DE (2) DE102007037125A1 (enExample)
WO (1) WO2008017297A1 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
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
US10348159B2 (en) 2013-06-06 2019-07-09 Milwaukee Electric Tool Corporation Brushless DC motor configuration for a power tool

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009029506A1 (de) * 2009-09-16 2011-03-24 Robert Bosch Gmbh Schalter-Platine-Einheit zum Einbau in einen Griff eines handgehaltenen Werkzeugs
JP5418119B2 (ja) 2009-09-30 2014-02-19 日立工機株式会社 作業機械
DE102011077442B4 (de) * 2011-06-14 2025-06-26 Robert Bosch Gmbh Getriebelose Handwerkzeugmaschine
WO2013051972A1 (en) 2011-10-06 2013-04-11 Husqvarna Ab Battery operated handheld power tool
FR2999464A1 (fr) * 2012-12-19 2014-06-20 Bosch Gmbh Robert Machine-outil portative equipee d'une unite de transport pour le refroidissement
DE102013204975A1 (de) * 2013-03-21 2014-10-09 Robert Bosch Gmbh Handwerkzeugmaschine
DE102013215821A1 (de) * 2013-08-09 2015-02-12 Robert Bosch Gmbh Handwerkzeugmaschine mit einem elektromotorischen Antrieb als Direktantrieb
US11047528B2 (en) 2016-02-12 2021-06-29 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 (ja) * 2018-06-20 2022-05-13 株式会社マキタ 電動工具および携帯用マルノコ
JP7066543B2 (ja) 2018-06-20 2022-05-13 株式会社マキタ 動力工具
CN112223433A (zh) * 2019-07-15 2021-01-15 株式会社牧田 自动刨床
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 (de) * 1980-04-04 1982-08-19 Milwaukee Electric Tool Corp., 53005 Brookfield, Wis. Elektrisches kraftwerkzeug
DE19508925A1 (de) 1995-03-13 1996-09-19 Marquardt Gmbh Elektrischer Schalter, insbesondere für Elektrohandwerkzeuge
JP4290232B2 (ja) * 1997-02-24 2009-07-01 富士通株式会社 ヒートシンクとそれを使用する情報処理装置
DE60042665D1 (de) * 1999-07-05 2009-09-10 Panasonic Corp Batteriepack und damit versehenes Elektrowerkzeug
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
BR0115383A (pt) * 2000-11-03 2003-09-02 Smc Electrical Products Inc Microacionador
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 (nl) * 2003-11-07 2005-05-10 Capax B V Schakelaareenheid met ventilatie.
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Cited By (4)

* Cited by examiner, † Cited by third party
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
US10348159B2 (en) 2013-06-06 2019-07-09 Milwaukee Electric Tool Corporation Brushless DC motor configuration for a power tool

Also Published As

Publication number Publication date
ATE474321T1 (de) 2010-07-15
DE102007037125A1 (de) 2008-04-03
EP2050112A1 (de) 2009-04-22
DE502007004414D1 (de) 2010-08-26
JP5231414B2 (ja) 2013-07-10
US20090213545A1 (en) 2009-08-27
JP2010500853A (ja) 2010-01-07
US7764502B2 (en) 2010-07-27
WO2008017297A1 (de) 2008-02-14

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