EP3833510B1 - Hand-held machine tool and method for operating a hand-held machine tool - Google Patents

Hand-held machine tool and method for operating a hand-held machine tool Download PDF

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Publication number
EP3833510B1
EP3833510B1 EP19742639.8A EP19742639A EP3833510B1 EP 3833510 B1 EP3833510 B1 EP 3833510B1 EP 19742639 A EP19742639 A EP 19742639A EP 3833510 B1 EP3833510 B1 EP 3833510B1
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EP
European Patent Office
Prior art keywords
motor
hand
magnetic field
power tool
held power
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.)
Active
Application number
EP19742639.8A
Other languages
German (de)
French (fr)
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EP3833510A1 (en
Inventor
Christian Iglhaut
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
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Hilti AG
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Publication date
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Publication of EP3833510A1 publication Critical patent/EP3833510A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/064—Means for driving the impulse member using an electromagnetic drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0015—Tools having a percussion-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/131—Idling mode of tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221—Sensors

Definitions

  • the present invention relates to a handheld power tool and a method for operating a handheld power tool.
  • EP 2 884 463 A1 discloses a handheld power tool according to the preamble of claim 1 and a method for operating a handheld power tool according to the preamble of claim 4.
  • Hand-held power tools often have a load detection of an electric motor of the hand-held power tool.
  • the handheld power tool can then be regulated according to a determined load.
  • the load is detected by measuring the current in the electronics of the handheld power tool. The current measurement must be implemented in the power train. It is desirable to simplify and improve the load detection of an electric motor of the handheld power tool.
  • the object of the present invention is to create an improved handheld power tool and to improve a method for operating a handheld power tool.
  • a handheld power tool according to claim 1 is proposed.
  • the hand-held power tool includes a tool holder and a motor for rotating and/or percussively driving the tool holder.
  • the hand-held power tool also includes a magnetic field sensor for detecting a magnetic field of the motor that is produced by driving the tool holder.
  • the hand power tool is, for example, a hammer drill, a chisel hammer, a combination hammer, a core drill or a screwdriver.
  • the tool holder of the hand tool is used to insert a rotatable tool, e.g. B. a drill or a chisel tool.
  • the motor of the hand-held power tool is in particular an electric motor, for example an electric motor with an adjustable speed.
  • the motor of the hand-held power tool is used in particular to set the tool in a rotary motion by driving the tool holder in a rotating and/or percussive manner and/or to make a flapping movement.
  • the motor of the hand-held power tool serves to cause the tool to rotate about a working axis by rotating the tool holder about a working axis.
  • an object such as a subsurface and/or a wall
  • the motor of the hand-held power tool is also used to set the tool in a percussive motion in the percussion direction by percussively driving the tool holder in an impact direction.
  • the impact direction is in particular parallel to the working axis.
  • the impact movement of the tool can be used to chisel an object.
  • the hand-held power tool is set up, for example, in such a way that percussive driving of the tool holder only begins when an object is machined.
  • the motor of the hand-held power tool is put into operation, as a result of which the motor rotates at a specific motor speed, for example.
  • the motor By putting the motor into operation, either only the motor rotates, e.g. B. in the case of a chisel hammer, or it rotates the engine and the tool, z. B. in the case of a rotary hammer.
  • the percussive driving of the tool holder is started.
  • the tool performs percussive movements in the case of the chisel hammer and performs rotary and percussive movements in the case of the rotary hammer.
  • the handheld power tool's magnetic field sensor is located near the motor.
  • the magnetic field sensor is, for example, a Hall sensor, a magnetoresistive sensor or a field plate sensor. However, other magnetic field sensors can also be used in the hand-held power tool.
  • the magnetic field sensor detects the motor's magnetic field generated by driving the tool holder.
  • the magnetic field sensor measures a magnetic field generated by a current-carrying conductor of the motor. This means that a current measurement of the motor can be carried out indirectly with the help of the magnetic field sensor through the magnetic field measurement.
  • a motor current required for driving the tool holder is measured by detecting the magnetic field of the motor.
  • a non-contact and precise current measurement of the handheld power tool, in particular the motor can take place.
  • a non-contact and accurate load detection of the magnetic field sensor Hand tool, especially the engine done.
  • the magnetic field sensor is arranged in the handheld power tool in such a way that, as the magnetic field of the motor, it detects a magnetic field of a current that is drawn by the motor when the tool holder is driven.
  • the magnetic field sensor is arranged in particular in the area of a power line of the motor.
  • the power line of the motor is in particular a current-carrying conductor that connects a power supply of the hand-held power tool, such as a battery or a power line, to the motor.
  • a current flowing through the power line depends in particular on the power required to drive the tool holder. Consequently, a magnetic field generated by the current flowing through the power line also depends on the power required to drive the tool holder.
  • the amperage of the current flowing through the power line is small when the handheld power tool is idling under a light load, and the amperage of the current flowing through the power line is large when the handheld power tool is machining a workpiece, i.e. is operated under load.
  • the magnetic field sensor is arranged in the hand-held power tool in such a way that it detects the magnetic field of the current as the magnetic field of the motor, which is consumed by the motor when driving the tool holder, an instantaneous current intensity required for driving the tool holder can be recorded. This means that the current power consumption of the engine can be recorded.
  • the hand-held power tool has a control device for determining a load state of the motor as a function of the detected magnetic field in order to distinguish between idling operation of the hand-held power tool and load operation.
  • the control device receives the magnetic field of the motor detected by the magnetic field sensor as a signal.
  • the control device determines a load condition of the engine, for example by comparing it with specific limit values.
  • the load state of the motor is particularly dependent on a load applied to the hand-held power tool.
  • the load state of the engine is, for example, idling operation and/or low-load operation. In idling mode, the motor of the hand-held power tool is in particular in operation, but no workpiece is being machined.
  • the load state of the engine can also be a load operation and/or high-load operation, for example. In a load operation and/or high-load operation, a workpiece is machined, in particular in a rotating and/or percussive manner.
  • the handheld power tool has a control device for determining the load state of the motor as a function of the detected magnetic field
  • different load states can be recognized and differentiated from one another when the handheld power tool is in operation.
  • idle operation can be distinguished from load operation.
  • the low-load operation can be distinguished from the high-load operation.
  • a pure drilling operation can be distinguished from a drilling and percussion operation.
  • an idle operation can be distinguished from an impact operation.
  • the hand-held power tool has an operating time counter for recording an operating time of the motor as a function of the load state determined.
  • the control device has the operating time counter.
  • the operating time counter has a memory unit, for example.
  • the operating time counter is set up in particular to separately record and store the operating time of the motor for specific detected load states.
  • the operating time counter records the operating time of the engine in idling operation separately from the operating time of the engine in (high) load operation.
  • the fact that the hand-held power tool has the operating time counter for recording the operating time of the motor as a function of the load state determined can improve the recording of the motor operating time.
  • control device is set up to adjust, in particular to control or regulate, the handheld power tool as a function of the ascertained load state.
  • control device is set up to adjust the hand-held power tool as a function of the determined load condition in such a way that the engine speed of the motor is changed as a function of the determined load condition.
  • speed of the motor can be adapted to the load condition, thereby improving the energy efficiency of the motor.
  • the handheld power tool can be adjusted very well, in particular controlled or regulated very well.
  • a method for operating a handheld power tool according to claim 4 is proposed.
  • the hand-held power tool has a tool holder and a motor for rotating and/or percussively driving the tool holder.
  • the method has a step of detecting a magnetic field of the motor that is produced by driving the tool holder.
  • the method also has a step of determining a load state of the motor as a function of the detected magnetic field.
  • the step of detecting the magnetic field of the motor includes detecting a magnetic field of a current drawn by the motor when the tool holder is driven.
  • the magnetic field of the current that is picked up by the motor when the tool holder is driven is detected, for example, by detecting the magnetic field of the current that flows through the power line described in connection with the hand-held power tool.
  • chiseling operation of the hand-held power tool is detected when the load state determined exceeds a specific limit value.
  • the chiseling operation of the hand-held power tool is detected when the detected magnetic field and/or the current intensity determined from the detected magnetic field exceeds the specific limit value.
  • the control device compares the detected magnetic field and/or the current intensity determined from the detected magnetic field with the specific limit value.
  • the specific limit value is, for example, a specific magnetic field strength and/or a specific current strength. Because the chiseling operation of the handheld power tool can be detected using the magnetic field sensor, the handheld power tool can be set depending on whether chiseling operation is present or not.
  • the method has a step of determining an operating time of the engine as a function of the load state determined.
  • the operating time of the motor is determined, for example, by the operating time counter described in connection with the hand-held power tool.
  • determining the load state of the motor as a function of the detected magnetic field includes distinguishing between idle operation of the handheld power tool and load operation.
  • the hand-held power tool can be set depending on whether idle operation or load operation is present.
  • the hand-held power tool is a hammer drill and the determination of the load state of the motor as a function of the detected magnetic field includes distinguishing between pure drilling operation and drilling and percussion operation.
  • the hammer drill has three different operating states.
  • the motor and the drill rotate, but no workpiece is machined.
  • the motor and the drill rotate, and the drill processes a workpiece by rotating about the work axis.
  • the motor and the drill rotate, and the drill processes a workpiece by rotating about the working axis and percussing in the direction of impact.
  • determining the load state of the motor as a function of the detected magnetic field can include distinguishing between no-load operation, pure drilling operation and drilling and percussion operation.
  • the hammer drill can be set depending on whether idle operation, pure drilling operation or drilling and percussion operation is present.
  • the hand-held power tool is a chipping hammer and the determination of the load state of the motor as a function of the detected magnetic field includes a distinction between idling operation and percussion operation.
  • the chipping hammer has two different operating states.
  • the motor rotates, but no workpiece is machined.
  • the motor rotates and the chisel tool machines a workpiece by percussive movement in the percussion direction.
  • the hand-held power tool can be set depending on whether the chisel hammer is in idling operation or percussion operation.
  • the method has a step of setting the hand power tool as a function of the determined load state.
  • the setting is, for example, controlling the hand-held power tool as a function of the load state determined.
  • the setting can also be a regulation of the hand-held power tool depending on the load state determined.
  • the setting of the hand-held power tool as a function of the determined load state includes changing a motor speed of the motor as a function of the determined load state.
  • the control device has, for example, a processor and a computer program executed with the aid of the processor.
  • the control device for example the computer program, includes in particular an algorithm or several algorithms which is/are set up to determine a load state of the motor depending on the detected magnetic field and/or to adjust the hand-held power tool depending on the load state determined.
  • the respective unit for example the processor, can be implemented in terms of hardware and/or software.
  • the unit can be designed as a device or as part of a device, for example as a computer or as a microprocessor.
  • the unit can be embodied as a computer program product, as a function, as a routine, as part of a program code or as an executable object.
  • a computer program product such as a computer program means
  • a server in a network, for example, as a storage medium such as a memory card, USB stick, CD-ROM, DVD, or in the form of a downloadable file. This can be done, for example, in a wireless communication network by transferring a corresponding file with the computer program product or the computer program means.
  • the rotary hammer 1 shows a hammer drill as an exemplary embodiment of the hand-held power tool 1 .
  • the rotary hammer 1 has a tool holder 2, in which a shank end of a tool 3, z. B. a drill can be used.
  • a motor 4 which drives a percussion mechanism 5 and a drive shaft 6 , forms a primary drive of the hammer drill 1 .
  • An accumulator 7 or a power line (not shown) supplies the motor 4 with power via a power line 17 . in the in 1 The example shown supplies the accumulator 7 with power to the motor 4 and is connected to the motor 4 by the power line 17 for this purpose.
  • a user can hold and guide the hammer drill 1 by a handle 8 .
  • the handle 8 is part of a housing 9 of the rotary hammer 1.
  • the rotary hammer 1 can be put into operation by means of a main switch 10.
  • the motor 4 By pressing the main button 10, the motor 4 is supplied with power from the accumulator 7 via the power line 17.
  • the latter drives the drive shaft 6.
  • the drive shaft 6 coupled to the tool holder 2 causes the tool holder 2 to rotate about a working axis 11 .
  • the tool 3 is rotated about the working axis 11 .
  • the rotary hammer 1 can hit the tool 3 in addition to rotating about the working axis 11 in a direction of impact 12 along the working axis 11 into a substrate.
  • the hammer drill 1 is set up in such a way that the impact movement of the tool 3 only begins when an object is processed. For example, pressing the switched-on rotary hammer 1 against the object to be machined starts driving the tool holder 2 through the impact mechanism 5. Because the impact mechanism 5 drives the tool holder 2, the tool 3 performs impact movements in the impact direction in addition to the rotary movement about the working axis 11 12 out.
  • the rotary hammer 1 has an operating selector switch 13, through which the tool holder 2 can be decoupled from the drive shaft 6, so that purely chiseling operation of the rotary hammer 1 is possible.
  • FIG. 1 shows a schematic view of a method for operating the hammer drill 1.
  • FIG 1 shows a schematic view of a method for operating the hammer drill 1.
  • a magnetic field of the motor 4 produced by the driving of the tool holder 2 is detected.
  • the hammer drill 1 has a magnetic field sensor 14 adjacent to the motor 4, in particular adjacent to the power line 17, for detecting the load of the motor 4, as shown in FIG 1 to see.
  • the current required for rotating and/or percussive driving of the tool holder 2 flows through the power line 17 to the motor 4 and generates a magnetic field around the power line 17.
  • the magnetic field sensor 14 detects the magnetic field of the motor 4, in particular of the power line 17.
  • a load condition of the motor 4 is determined as a function of the detected magnetic field.
  • the strength of the current flowing through the power line 17 depends on the instantaneous power consumption of the motor 4 of the rotary hammer 1 .
  • the strength of the magnetic field generated by the current flowing through the power line 17 is therefore also dependent on the instantaneous power consumption of the motor 4 of the rotary hammer 1 .
  • the motor 4 By pressing the main button 10, the motor 4 is set in rotation. As long as the tool 3 is not yet machining the workpiece, ie the hammer drill 1 is in idling mode, the load applied to the motor 4 is low and the power consumption of the motor 4 is correspondingly low. In this state, a current of a small amperage flows through the current conductor 17, which generates weak magnetic current around the current conductor 17. If a workpiece is now machined with the tool 3, the load applied to the motor 4 and the power consumed by the motor 4 increase in comparison to idling operation.
  • the amperage of the current flowing through the conductor 17 and the strength of the magnetic field generated by the current around the conductor 17 increase the load applied to the motor 4 further.
  • the load of the motor is correspondingly large and a current with a large current flows through the conductor 17. A strong magnetic current around the conductor 17 is thereby generated.
  • these different load states can be determined and differentiated by a control device 15 of the rotary hammer 1 in the second step S2 of the method.
  • the magnetic field sensor 14 transmits the detected magnetic field as a signal to the control device 15.
  • the control device 15 compares the detected Magnetic field with certain limit values and thus determines whether idle operation, pure drilling operation or drilling and percussion operation is present.
  • the specific limit values are specific values for the magnetic field strength. For example, the control device 15 determines that idle operation is present when the detected magnetic field is less than a first limit value.
  • control device 15 determines that a pure drilling operation is taking place when the detected magnetic field is greater than or equal to the first limit value and less than a second limit value. For example, the control device 15 determines that a drilling and percussion operation is taking place when the detected magnetic field is greater than or equal to the second limit value.
  • an operating time of the engine 4 is determined as a function of the load state determined.
  • the hammer drill 1, in particular the control device 15, can have, for example, an operating time counter 16 for recording the operating time of the motor 4 as a function of the load condition determined, as in 1 to see.
  • the control device 15 and/or the operating time counter 16 have, for example, a storage unit (not shown) for storing the recorded operating time as a function of the ascertained load state.
  • the operating time counter 16 records the operating time of the motor 4 continuously or at short time intervals, for example from the time the main button 10 is actuated, and assigns it to the load state determined by the control device 15 . For example, after the rotary hammer 1 has been switched on via the main button 10, the operating time counter 16 first records an operating time in idle mode, followed by an operating time in drilling and percussion mode.
  • the hammer drill 1 is adjusted, in particular controlled, as a function of the determined load condition. For example, the engine speed of the engine 4 is changed depending on the determined load condition. For example, the engine speed is reduced in the idle operation and the engine speed is increased in the percussion and drilling operations. The energy consumption of the hammer drill 1 can be reduced by this adjustment of the engine speed to the load condition of the hammer drill 1 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Percussive Tools And Related Accessories (AREA)

Description

Die vorliegende Erfindung betrifft eine Handwerkzeugmaschine und ein Verfahren zum Betreiben einer Handwerkzeugmaschine.The present invention relates to a handheld power tool and a method for operating a handheld power tool.

EP 2 884 463 A1 offenbart eine Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1 und ein Verfahren zum Betreiben einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 4. EP 2 884 463 A1 discloses a handheld power tool according to the preamble of claim 1 and a method for operating a handheld power tool according to the preamble of claim 4.

Handwerkzeugmaschine verfügen oft über eine Lasterkennung eines Elektromotors der Handwerkzeugmaschine. Beispielsweise kann die Handwerkzeugmaschine dann gemäß einer ermittelten Last geregelt werden. Bei herkömmlichen Handwerkzeugmaschine erfolgt die Lasterkennung durch eine Strommessung in der Elektronik der Handwerkzeugmaschine. Dabei muss die Strommessung in den Leistungsstrang implementiert werden. Es ist wünschenswert, die Lasterkennung eines Elektromotors der Handwerkzeugmaschine zu vereinfachen und zu verbessern.Hand-held power tools often have a load detection of an electric motor of the hand-held power tool. For example, the handheld power tool can then be regulated according to a determined load. In conventional handheld power tools, the load is detected by measuring the current in the electronics of the handheld power tool. The current measurement must be implemented in the power train. It is desirable to simplify and improve the load detection of an electric motor of the handheld power tool.

Vor diesem Hintergrund besteht die Aufgabe der vorliegenden Erfindung, eine verbesserte Handwerkzeugmaschine zu schaffen und ein Verfahren zum Betreiben einer Handwerkzeugmaschine zu verbessern.Against this background, the object of the present invention is to create an improved handheld power tool and to improve a method for operating a handheld power tool.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Gemäß einem ersten Aspekt der Erfindung wird eine Handwerkzeugmaschine nach Anspruch 1 vorgeschlagen. Die Handwerkzeugmaschine umfasst eine Werkzeugaufnahme und einen Motor zum drehenden und/oder schlagenden Antreiben der Werkzeugaufnahme. Die Handwerkzeugmaschine umfasst außerdem einen Magnetfeldsensor zum Erfassen eines durch das Antreiben der Werkzeugaufnahme entstehenden Magnetfelds des Motors.According to a first aspect of the invention, a handheld power tool according to claim 1 is proposed. The hand-held power tool includes a tool holder and a motor for rotating and/or percussively driving the tool holder. The hand-held power tool also includes a magnetic field sensor for detecting a magnetic field of the motor that is produced by driving the tool holder.

Die Handwerkzeugmaschine ist beispielsweise ein Bohrhammer, ein Meißelhammer, ein Kombihammer, ein Kernbohrer oder ein Schrauber. Die Werkzeugaufnahme der Handwerkzeugmaschine dient zum Einsetzen eines drehbaren Werkzeugs, z. B. eines Bohrers oder eines Meißelwerkzeugs. Der Motor der Handwerkzeugmaschine ist insbesondere ein Elektromotor, beispielsweise ein Elektromotor mit einstellbarer Drehzahl. Der Motor der Handwerkzeugmaschine dient insbesondere dazu, durch drehendes und/oder schlagendes Antreiben der Werkzeugaufnahme das Werkzeug in eine Drehbewegung und/oder eine Schlagbewegung zu versetzen. Beispielsweise dient der Motor der Handwerkzeugmaschine dazu, durch drehendes Antreiben der Werkzeugaufnahme um eine Arbeitsachse das Werkzeug in eine Rotation um die Arbeitsachse zu versetzen. Durch die Rotation des Werkzeugs kann ein Gegenstand, wie beispielsweise ein Untergrund und/oder eine Wand, bohrend bearbeitet werden. Beispielsweise dient der Motor der Handwerkzeugmaschine auch dazu, durch schlagendes Antreiben der Werkzeugaufnahme in einer Schlagrichtung das Werkzeug in eine Schlagbewegung in Schlagrichtung zu versetzen. Die Schlagrichtung ist insbesondere parallel zur Arbeitsachse. Durch die Schlagbewegung des Werkzeugs kann ein Gegenstand meißelnd bearbeitet werden.The hand power tool is, for example, a hammer drill, a chisel hammer, a combination hammer, a core drill or a screwdriver. The tool holder of the hand tool is used to insert a rotatable tool, e.g. B. a drill or a chisel tool. The motor of the hand-held power tool is in particular an electric motor, for example an electric motor with an adjustable speed. The motor of the hand-held power tool is used in particular to set the tool in a rotary motion by driving the tool holder in a rotating and/or percussive manner and/or to make a flapping movement. For example, the motor of the hand-held power tool serves to cause the tool to rotate about a working axis by rotating the tool holder about a working axis. By rotating the tool, an object, such as a subsurface and/or a wall, can be drilled. For example, the motor of the hand-held power tool is also used to set the tool in a percussive motion in the percussion direction by percussively driving the tool holder in an impact direction. The impact direction is in particular parallel to the working axis. The impact movement of the tool can be used to chisel an object.

Die Handwerkzeugmaschine ist beispielsweise derart eingerichtet, dass ein schlagendes Antreiben der Werkzeugaufnahme erst mit Bearbeiten eines Gegenstands einsetzt. Beispielsweise wird durch Betätigen eines Hauptschalters der Handwerkzeugmaschine der Motor der Handwerkzeugmaschine in Betrieb genommen, wodurch der Motor beispielsweise mit einer bestimmten Motordrehzahl dreht. Durch das in Betrieb nehmen des Motors dreht sich entweder nur der Motor, z. B. im Fall eines Meißelhammers, oder es dreht sich der Motor und das Werkzeug, z. B. im Fall eines Bohrhammers. Durch Andrücken der eingeschalteten Handwerkzeugmaschine gegen den zu bearbeitenden Gegenstand wird beispielsweise das schlagende Antreiben der Werkzeugaufnahme gestartet. Durch Starten des schlagenden Antreibens der Werkzeugaufnahme führt das Werkzeug im Fall des Meißelhammers Schlagbewegungen aus und führt das Werkzeug im Fall des Bohrhammers Dreh- und Schlagbewegungen aus.The hand-held power tool is set up, for example, in such a way that percussive driving of the tool holder only begins when an object is machined. For example, by actuating a main switch of the hand-held power tool, the motor of the hand-held power tool is put into operation, as a result of which the motor rotates at a specific motor speed, for example. By putting the motor into operation, either only the motor rotates, e.g. B. in the case of a chisel hammer, or it rotates the engine and the tool, z. B. in the case of a rotary hammer. By pressing the switched-on handheld power tool against the object to be machined, for example, the percussive driving of the tool holder is started. By starting the percussive driving of the tool holder, the tool performs percussive movements in the case of the chisel hammer and performs rotary and percussive movements in the case of the rotary hammer.

Der Magnetfeldsensor der Handwerkzeugmaschine ist in der Nähe des Motors angeordnet. Der Magnetfeldsensor ist beispielsweise ein Hallsensor, ein magneto-resistiver Sensor oder ein Feldplattensensor. Es können aber auch andere Magnetfeldsensoren in der Handwerkzeugmaschine zum Einsatz kommen. Der Magnetfeldsensor erfasst das durch das Antreiben der Werkzeugaufnahme entstehende Magnetfeld des Motors. Insbesondere misst der Magnetfeldsensor ein durch einen stromdurchflossenen Leiter des Motors erzeugtes Magnetfeld. Das heißt, dass mit Hilfe des Magnetfeldsensors durch die Magnetfeldmessung indirekt eine Strommessung des Motors durchgeführt werden kann. Insbesondere wird durch das Erfassen des Magnetfelds des Motors ein für das Antreiben der Werkzeugaufnahme erforderlicher Strom des Motors gemessen.The handheld power tool's magnetic field sensor is located near the motor. The magnetic field sensor is, for example, a Hall sensor, a magnetoresistive sensor or a field plate sensor. However, other magnetic field sensors can also be used in the hand-held power tool. The magnetic field sensor detects the motor's magnetic field generated by driving the tool holder. In particular, the magnetic field sensor measures a magnetic field generated by a current-carrying conductor of the motor. This means that a current measurement of the motor can be carried out indirectly with the help of the magnetic field sensor through the magnetic field measurement. In particular, a motor current required for driving the tool holder is measured by detecting the magnetic field of the motor.

Aufgrund des Magnetfeldsensors kann eine berührungslose und genaue Strommessung der Handwerkzeugmaschine, insbesondere des Motors, erfolgen. Insbesondere kann aufgrund des Magnetfeldsensors eine berührungslose und genaue Lasterkennung der Handwerkzeugmaschine, insbesondere des Motors, erfolgen. Insbesondere ist es für eine Lasterkennung nicht erforderlich, eine Strommessung in der Elektronik der Handwerkzeugmaschine zu implementieren.Due to the magnetic field sensor, a non-contact and precise current measurement of the handheld power tool, in particular the motor, can take place. In particular, a non-contact and accurate load detection of the magnetic field sensor Hand tool, especially the engine, done. In particular, it is not necessary for load detection to implement a current measurement in the electronics of the hand-held power tool.

Dadurch, dass eine Lasterkennung der Handwerkzeugmaschine mittels des Magnetfeldsensors berührungslos und genau durchgeführt werden kann, können verschiedene Betriebszustände der Handwerkzeugmaschine erkannt und/oder voneinander unterschieden werden.Since load detection of the handheld power tool can be carried out without contact and accurately using the magnetic field sensor, various operating states of the handheld power tool can be recognized and/or differentiated from one another.

Gemäß der Erfindung ist der Magnetfeldsensor derart in der Handwerkzeugmaschine angeordnet, dass er als das Magnetfeld des Motors ein Magnetfeld eines Stroms erfasst, der bei dem Antreiben der Werkzeugaufnahme von dem Motor aufgenommenen wird.According to the invention, the magnetic field sensor is arranged in the handheld power tool in such a way that, as the magnetic field of the motor, it detects a magnetic field of a current that is drawn by the motor when the tool holder is driven.

Der Magnetfeldsensor ist insbesondere im Bereich einer Stromleitung des Motors angeordnet. Die Stromleitung des Motors ist insbesondere ein stromführender Leiter, der eine Stromversorgung der Handwerkzeugmaschine, wie beispielsweise einen Akkumulator oder eine Netzleitung, mit dem Motor verbindet. Durch die Zufuhr von Strom durch die Stromleitung zu dem Motor treibt der Motor die Werkzeugaufnahme zu drehenden und/oder schlagenden Bewegungen an. Ein durch die Stromleitung fließender Strom ist insbesondere von einer für das Antreiben der Werkzeugaufnahme erforderlichen Leistung abhängig. Folglich ist auch ein von dem durch die Stromleitung fließenden Stroms erzeugtes Magnetfeld von der für das Antreiben der Werkzeugaufnahme erforderlichen Leistung abhängig. Insbesondere ist die Stromstärke des durch die Stromleitung fließenden Stroms gering, wenn die Handwerkzeugmaschine unter geringer Last im Leerlauf betrieben wird, und die Stromstärke des durch die Stromleitung fließenden Stroms ist groß, wenn die Handwerkzeugmaschine ein Werkstück bearbeitet, also unter Last betrieben wird. Dadurch, dass der Magnetfeldsensor derart in der Handwerkzeugmaschine angeordnet ist, dass er als das Magnetfeld des Motors das Magnetfeld des Stroms erfasst, der bei dem Antreiben der Werkzeugaufnahme von dem Motor aufgenommenen wird, kann eine für das Antreiben der Werkzeugaufnahme erforderliche momentane Stromstärke erfasst werden. Das heißt, es kann die momentane Leistungsaufnahme des Motors erfasst werden.The magnetic field sensor is arranged in particular in the area of a power line of the motor. The power line of the motor is in particular a current-carrying conductor that connects a power supply of the hand-held power tool, such as a battery or a power line, to the motor. By supplying current through the power line to the motor, the motor drives the tool holder to rotate and/or percussive movements. A current flowing through the power line depends in particular on the power required to drive the tool holder. Consequently, a magnetic field generated by the current flowing through the power line also depends on the power required to drive the tool holder. In particular, the amperage of the current flowing through the power line is small when the handheld power tool is idling under a light load, and the amperage of the current flowing through the power line is large when the handheld power tool is machining a workpiece, i.e. is operated under load. Because the magnetic field sensor is arranged in the hand-held power tool in such a way that it detects the magnetic field of the current as the magnetic field of the motor, which is consumed by the motor when driving the tool holder, an instantaneous current intensity required for driving the tool holder can be recorded. This means that the current power consumption of the engine can be recorded.

Gemäß der Erfindung weist die Handwerkzeugmaschine eine Steuereinrichtung zum Ermitteln eines Lastzustands des Motors in Abhängigkeit des erfassten Magnetfelds zum Unterscheiden eines Leerlaufbetriebs der Handwerkzeugmaschine von einem Lastbetrieb auf.According to the invention, the hand-held power tool has a control device for determining a load state of the motor as a function of the detected magnetic field in order to distinguish between idling operation of the hand-held power tool and load operation.

Insbesondere empfängt die Steuereinrichtung das von dem Magnetfeldsensor erfasste Magnetfeld des Motors als ein Signal. Die Steuereinrichtung ermittelt, beispielsweise durch Vergleich mit bestimmten Grenzwerten, einen Lastzustand des Motors. Der Lastzustand des Motors ist insbesondere von einer an der Handwerkzeugmaschine anliegenden Last abhängig. Der Lastzustand des Motors ist beispielsweise ein Leerlaufbetrieb und/oder ein Niedriglastbetrieb. In einem Leerlaufbetrieb ist insbesondere der Motor der Handwerkzeugmaschine in Betrieb, jedoch wird kein Werkstück bearbeitet. Der Lastzustand des Motors kann beispielsweise auch ein Lastbetrieb und/oder Hochlastbetrieb sein. In einem Lastbetrieb und/oder Hochlastbetrieb wird ein Werkstück, insbesondere drehend und/oder schlagend, bearbeitet.In particular, the control device receives the magnetic field of the motor detected by the magnetic field sensor as a signal. The control device determines a load condition of the engine, for example by comparing it with specific limit values. The load state of the motor is particularly dependent on a load applied to the hand-held power tool. The load state of the engine is, for example, idling operation and/or low-load operation. In idling mode, the motor of the hand-held power tool is in particular in operation, but no workpiece is being machined. The load state of the engine can also be a load operation and/or high-load operation, for example. In a load operation and/or high-load operation, a workpiece is machined, in particular in a rotating and/or percussive manner.

Dadurch, dass die Handwerkzeugmaschine eine Steuereinrichtung zum Ermitteln des Lastzustands des Motors in Abhängigkeit des erfassten Magnetfelds aufweist, können verschiedene Lastzustände bei einem Betrieb der Handwerkzeugmaschine erkannt und voneinander unterschieden werden. Beispielsweise kann der Leerlaufbetrieb von dem Lastbetrieb unterschieden werden. Beispielsweise kann der Niedriglastbetrieb von dem Hochlastbetrieb unterschieden werden. Beispielsweise kann ein reiner Bohrbetrieb von einem Bohr- und Schlagbetrieb unterschieden werden. Beispielsweise kann ein Leerlaufbetrieb von einem Schlagbetrieb unterschieden werden.Because the handheld power tool has a control device for determining the load state of the motor as a function of the detected magnetic field, different load states can be recognized and differentiated from one another when the handheld power tool is in operation. For example, idle operation can be distinguished from load operation. For example, the low-load operation can be distinguished from the high-load operation. For example, a pure drilling operation can be distinguished from a drilling and percussion operation. For example, an idle operation can be distinguished from an impact operation.

Gemäß einer weiteren Ausführungsform weist die Handwerkzeugmaschine einen Betriebszeitzähler zum Erfassen einer Betriebszeit des Motors in Abhängigkeit des ermittelten Lastzustands auf.According to a further embodiment, the hand-held power tool has an operating time counter for recording an operating time of the motor as a function of the load state determined.

Beispielsweise weist die Steuereinrichtung den Betriebszeitzähler auf. Der Betriebszeitzähler weist beispielsweise eine Speichereinheit auf. Der Betriebszeitzähler ist insbesondere eingerichtet, die Betriebszeit des Motors für bestimmte erfasste Lastzustände separat zu erfassen und zu speichern. Beispielsweise erfasst der Betriebszeitzähler die Betriebszeit des Motors im Leerlaufbetrieb getrennt von der Betriebszeit des Motors im (Hoch-)Lastbetrieb.For example, the control device has the operating time counter. The operating time counter has a memory unit, for example. The operating time counter is set up in particular to separately record and store the operating time of the motor for specific detected load states. For example, the operating time counter records the operating time of the engine in idling operation separately from the operating time of the engine in (high) load operation.

Dadurch, dass die Handwerkzeugmaschine den Betriebszeitzähler zum Erfassen der Betriebszeit des Motors in Abhängigkeit des ermittelten Lastzustands aufweist, kann ein Erfassen der Motorbetriebszeit verbessert werden.The fact that the hand-held power tool has the operating time counter for recording the operating time of the motor as a function of the load state determined can improve the recording of the motor operating time.

Gemäß einer weiteren Ausführungsform ist die Steuereinrichtung eingerichtet, die Handwerkzeugmaschine in Abhängigkeit des ermittelten Lastzustands einzustellen, insbesondere zu steuern oder zu regeln.According to a further embodiment, the control device is set up to adjust, in particular to control or regulate, the handheld power tool as a function of the ascertained load state.

Beispielsweise ist die Steuereinrichtung eingerichtet, die Handwerkzeugmaschine in Abhängigkeit des ermittelten Lastzustands derart einzustellen, dass die Motordrehzahl des Motors in Abhängigkeit des ermittelten Lastzustands geändert wird. Dadurch kann die Drehzahl des Motors an den Lastzustand angepasst werden und damit die Energieeffizienz des Motors verbessert werden.For example, the control device is set up to adjust the hand-held power tool as a function of the determined load condition in such a way that the engine speed of the motor is changed as a function of the determined load condition. As a result, the speed of the motor can be adapted to the load condition, thereby improving the energy efficiency of the motor.

Dadurch, dass der Lastzustand mittels des Magnetfeldsensors genau erkannt werden kann und die Steuereinrichtung die Handwerkzeugmaschine in Abhängigkeit des ermittelten Lastzustands einstellt, kann die Handwerkzeugmaschine sehr gut eingestellt werden, insbesondere sehr gut gesteuert oder geregelt werden.Due to the fact that the load condition can be precisely detected using the magnetic field sensor and the control device adjusts the handheld power tool as a function of the determined load condition, the handheld power tool can be adjusted very well, in particular controlled or regulated very well.

Gemäß einem zweiten Aspekt der Erfindung wird ein Verfahren zum Betreiben einer Handwerkzeugmaschine nach Anspruch 4 vorgeschlagen. Die Handwerkzeugmaschine weist eine Werkzeugaufnahme und einen Motor zum drehenden und/oder schlagenden Antreiben der Werkzeugaufnahme auf. Das Verfahren weist einen Schritt eines Erfassens eines durch das Antreiben der Werkzeugaufnahme entstehenden Magnetfelds des Motors auf. Das Verfahren weist außerdem einen Schritt eines Ermittelns eines Lastzustands des Motors in Abhängigkeit des erfassten Magnetfelds auf.According to a second aspect of the invention, a method for operating a handheld power tool according to claim 4 is proposed. The hand-held power tool has a tool holder and a motor for rotating and/or percussively driving the tool holder. The method has a step of detecting a magnetic field of the motor that is produced by driving the tool holder. The method also has a step of determining a load state of the motor as a function of the detected magnetic field.

Eigenschaften und Vorteile, die für die Handwerkzeugmaschine beschrieben wurden, gelten für das vorgeschlagene Verfahren zum Betreiben der Handwerkzeugmaschine entsprechend.Properties and advantages that have been described for the handheld power tool apply accordingly to the proposed method for operating the handheld power tool.

Gemäß einer Ausführungsform des zweiten Aspekts weist der Schritt des Erfassens des Magnetfelds des Motors ein Erfassen eines Magnetfelds eines Stroms auf, der bei dem Antreiben der Werkzeugaufnahme von dem Motor aufgenommen wird.According to an embodiment of the second aspect, the step of detecting the magnetic field of the motor includes detecting a magnetic field of a current drawn by the motor when the tool holder is driven.

Das Erfassen des Magnetfelds des Stroms, der bei dem Antreiben der Werkzeugaufnahme von dem Motor aufgenommen wird, erfolgt beispielsweise durch Erfassen des Magnetfelds des Stroms, der durch die im Zusammenhang mit der Handwerkzeugmaschine beschriebene Stromleitung fließt.The magnetic field of the current that is picked up by the motor when the tool holder is driven is detected, for example, by detecting the magnetic field of the current that flows through the power line described in connection with the hand-held power tool.

Gemäß einer weiteren Ausführungsform des zweiten Aspekts wird ein meißelnder Betrieb der Handwerkzeugmaschine erkannt, wenn der ermittelte Lastzustand einen bestimmten Grenzwert überschreitet.According to a further embodiment of the second aspect, chiseling operation of the hand-held power tool is detected when the load state determined exceeds a specific limit value.

Beispielsweise wird der meißelnde Betrieb der Handwerkzeugmaschine erkannt, wenn das erfasste Magnetfeld und/oder die aus dem erfassten Magnetfeld ermittelte Stromstärke den bestimmten Grenzwert überschreitet. Insbesondere vergleicht die Steuereinrichtung das erfasste Magnetfeld und/oder die aus dem erfassten Magnetfeld ermittelte Stromstärke mit dem bestimmten Grenzwert. Der bestimmte Grenzwert ist beispielsweise eine bestimmte Magnetfeldstärke und/oder eine bestimmte Stromstärke. Dadurch, dass der meißelnde Betrieb der Handwerkzeugmaschine mit Hilfe des Magnetfeldsensors erkannt werden kann, kann die Handwerkzeugmaschine abhängig davon, ob ein meißelnder Betrieb vorliegt oder nicht, eingestellt werden.For example, the chiseling operation of the hand-held power tool is detected when the detected magnetic field and/or the current intensity determined from the detected magnetic field exceeds the specific limit value. In particular, the control device compares the detected magnetic field and/or the current intensity determined from the detected magnetic field with the specific limit value. The specific limit value is, for example, a specific magnetic field strength and/or a specific current strength. Because the chiseling operation of the handheld power tool can be detected using the magnetic field sensor, the handheld power tool can be set depending on whether chiseling operation is present or not.

Gemäß einer weiteren Ausführungsform des zweiten Aspekts weist das Verfahren einen Schritt eines Ermittelns einer Betriebszeit des Motors in Abhängigkeit des ermittelten Lastzustands auf.According to a further embodiment of the second aspect, the method has a step of determining an operating time of the engine as a function of the load state determined.

Die Betriebszeit des Motors wird beispielsweise von dem im Zusammenhang mit der Handwerkzeugmaschine beschriebenen Betriebszeitzähler ermittelt.The operating time of the motor is determined, for example, by the operating time counter described in connection with the hand-held power tool.

Gemäß der Erfindung weist das Ermitteln des Lastzustands des Motors in Abhängigkeit des erfassten Magnetfelds ein Unterscheiden eines Leerlaufbetriebs der Handwerkzeugmaschine von einem Lastbetrieb auf.According to the invention, determining the load state of the motor as a function of the detected magnetic field includes distinguishing between idle operation of the handheld power tool and load operation.

Dadurch kann die Handwerkzeugmaschine abhängig davon, ob der Leerlaufbetrieb oder der Lastbetrieb vorliegt, eingestellt werden.As a result, the hand-held power tool can be set depending on whether idle operation or load operation is present.

Gemäß einer weiteren Ausführungsform des zweiten Aspekts ist die Handwerkzeugmaschine ein Bohrhammer und weist das Ermitteln des Lastzustands des Motors in Abhängigkeit des erfassten Magnetfelds ein Unterscheiden eines reinen Bohrbetriebs von einem Bohr- und Schlagbetrieb auf.According to a further embodiment of the second aspect, the hand-held power tool is a hammer drill and the determination of the load state of the motor as a function of the detected magnetic field includes distinguishing between pure drilling operation and drilling and percussion operation.

Der Bohrhammer weist insbesondere drei unterschiedliche Betriebszustände auf. In einem Leerlaufbetrieb des Bohrhammers drehen sich der Motor und der Bohrer, jedoch wird kein Werkstück bearbeitet. In einem reinen Bohrbetrieb drehen sich der Motor und der Bohrer und der Bohrer bearbeitet ein Werkstück durch eine Drehbewegung um die Arbeitsachse. In einem Bohr- und Schlagbetrieb drehen sich der Motor und der Bohrer und der Bohrer bearbeitet ein Werkstück durch eine Drehbewegung um die Arbeitsachse und eine Schlagbewegung in Schlagrichtung.In particular, the hammer drill has three different operating states. In an idle operation of the hammer drill, the motor and the drill rotate, but no workpiece is machined. In a pure drilling operation, the motor and the drill rotate, and the drill processes a workpiece by rotating about the work axis. In In a drilling and percussion operation, the motor and the drill rotate, and the drill processes a workpiece by rotating about the working axis and percussing in the direction of impact.

Bei dem Bohrhammer kann das Ermitteln des Lastzustands des Motors in Abhängigkeit des erfassten Magnetfelds ein Unterscheiden des Leerlaufbetriebs, des reinen Bohrbetriebs und des Bohr- und Schlagbetriebs aufweisen. Dadurch kann der Bohrhammer abhängig davon, ob der Leerlaufbetrieb, der reine Bohrbetrieb oder der Bohr- und Schlagbetrieb vorliegt, eingestellt werden.In the case of the rotary hammer, determining the load state of the motor as a function of the detected magnetic field can include distinguishing between no-load operation, pure drilling operation and drilling and percussion operation. As a result, the hammer drill can be set depending on whether idle operation, pure drilling operation or drilling and percussion operation is present.

Gemäß einer weiteren Ausführungsform des zweiten Aspekts ist die Handwerkzeugmaschine ein Meißelhammer und weist das Ermitteln des Lastzustands des Motors in Abhängigkeit des erfassten Magnetfelds ein Unterscheiden des Leerlaufbetriebs von einem Schlagbetrieb auf.According to a further embodiment of the second aspect, the hand-held power tool is a chipping hammer and the determination of the load state of the motor as a function of the detected magnetic field includes a distinction between idling operation and percussion operation.

Der Meißelhammer weist insbesondere zwei unterschiedliche Betriebszustände auf. In dem Leerlaufbetrieb des Meißelhammers dreht sich der Motor, jedoch wird kein Werkstück bearbeitet. In dem Lastzustand und/oder Schlagbetrieb des Meißelhammers dreht sich der Motor und das Meißelwerkzeug bearbeitet ein Werkstück durch eine Schlagbewegung in der Schlagrichtung.In particular, the chipping hammer has two different operating states. When the chipping hammer is idling, the motor rotates, but no workpiece is machined. In the load condition and/or percussion operation of the chisel hammer, the motor rotates and the chisel tool machines a workpiece by percussive movement in the percussion direction.

Dadurch, dass bei dem Meißelhammer das Ermitteln des Lastzustands des Motors in Abhängigkeit des erfassten Magnetfelds ein Unterscheiden des Leerlaufbetriebs von dem Schlagbetrieb aufweist, kann die Handwerkzeugmaschine abhängig davon, ob der Leerlaufbetrieb des Meißelhammers oder der Schlagbetrieb vorliegt, eingestellt werden.Due to the fact that with the chisel hammer the determination of the load state of the motor as a function of the detected magnetic field has a distinction between idling operation and percussion operation, the hand-held power tool can be set depending on whether the chisel hammer is in idling operation or percussion operation.

Gemäß einer weiteren Ausführungsform des zweiten Aspekts weist das Verfahren einen Schritt eines Einstellens der Handwerkzeugmaschine in Abhängigkeit des ermittelten Lastzustands auf.According to a further embodiment of the second aspect, the method has a step of setting the hand power tool as a function of the determined load state.

Das Einstellen ist beispielsweise ein Steuern der Handwerkzeugmaschine in Abhängigkeit des ermittelten Lastzustands. Das Einstellen kann auch ein Regeln der Handwerkzeugmaschine in Abhängigkeit des ermittelten Lastzustands sein.The setting is, for example, controlling the hand-held power tool as a function of the load state determined. The setting can also be a regulation of the hand-held power tool depending on the load state determined.

Gemäß einer weiteren Ausführungsform des zweiten Aspekts weist das Einstellen der Handwerkzeugmaschine in Abhängigkeit des ermittelten Lastzustands ein Ändern einer Motordrehzahl des Motors in Abhängigkeit des ermittelten Lastzustands auf.According to a further embodiment of the second aspect, the setting of the hand-held power tool as a function of the determined load state includes changing a motor speed of the motor as a function of the determined load state.

Die Steuereinrichtung weist beispielsweise einen Prozessor und ein mit Hilfe des Prozessors ausgeführtes Computerprogramm auf. Die Steuereinrichtung, beispielsweise das Computerprogramm, umfasst insbesondere einen Algorithmus oder mehrere Algorithmen, welcher/welche dazu eingerichtet ist/sind, einen Lastzustand des Motors in Abhängigkeit des erfassten Magnetfelds zu ermitteln und/oder die Handwerkzeugmaschine in Abhängigkeit des ermittelten Lastzustands einzustellen.The control device has, for example, a processor and a computer program executed with the aid of the processor. The control device, for example the computer program, includes in particular an algorithm or several algorithms which is/are set up to determine a load state of the motor depending on the detected magnetic field and/or to adjust the hand-held power tool depending on the load state determined.

Die jeweilige Einheit, zum Beispiel der Prozessor, kann hardwaretechnisch und/oder auch softwaretechnisch implementiert sein. Bei einer hardwaretechnischen Implementierung kann die Einheit als Vorrichtung oder als Teil einer Vorrichtung, zum Beispiel als Computer oder als Mikroprozessor, ausgebildet sein. Bei einer softwaretechnischen Implementierung kann die Einheit als Computerprogrammprodukt, als eine Funktion, als eine Routine, als Teil eines Programmcodes oder als ausführbares Objekt ausgebildet sein.The respective unit, for example the processor, can be implemented in terms of hardware and/or software. In the case of a hardware implementation, the unit can be designed as a device or as part of a device, for example as a computer or as a microprocessor. In the case of a software implementation, the unit can be embodied as a computer program product, as a function, as a routine, as part of a program code or as an executable object.

Ein Computerprogrammprodukt, wie z.B. ein Computerprogramm-Mittel, kann beispielsweise als Speichermedium, wie z.B. Speicherkarte, USB-Stick, CD-ROM, DVD, oder auch in Form einer herunterladbaren Datei von einem Server in einem Netzwerk bereitgestellt oder geliefert werden. Dies kann zum Beispiel in einem drahtlosen Kommunikations-Netzwerk durch die Übertragung einer entsprechenden Datei mit dem Computerprogrammprodukt oder dem Computerprogramm-Mittel erfolgen.A computer program product, such as a computer program means, can be made available or supplied by a server in a network, for example, as a storage medium such as a memory card, USB stick, CD-ROM, DVD, or in the form of a downloadable file. This can be done, for example, in a wireless communication network by transferring a corresponding file with the computer program product or the computer program means.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In den Figuren zeigt:

Fig. 1
eine schematische Ansicht einer Handwerkzeugmaschine; und
Fig. 2
eine schematische Ansicht eines Verfahrens zum Betreiben der Handwerkzeugmaschine gemäß Fig. 1.
The following description explains the invention using exemplary embodiments and figures. In the figures shows:
1
a schematic view of a hand tool; and
2
a schematic view of a method for operating the handheld power tool according to FIG 1 .

AUSFÜHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Im Folgenden werden anhand der Figuren 1 und 2 eine Ausführungsform der Handwerkzeugmaschine 1 und ein Verfahren zum Betreiben der Handwerkzeugmaschine 1 beschrieben.The following are based on the figures 1 and 2 an embodiment of the handheld power tool 1 and a method for operating the handheld power tool 1 are described.

Fig. 1 zeigt als Ausführungsbeispiel der Handwerkzeugmaschine 1 einen Bohrhammer. Der Bohrhammer 1 hat eine Werkzeugaufnahme 2, in welche ein Schaftende eines Werkzeugs 3, z. B. eines Bohrers, eingesetzt werden kann. Einen primären Antrieb des Bohrhammers 1 bildet ein Motor 4, welcher ein Schlagwerk 5 und eine Antriebswelle 6 antreibt. Ein Akkumulator 7 oder eine Netzleitung (nicht gezeigt) versorgt den Motor 4 über eine Stromleitung 17 mit Strom. In dem in Fig. 1 gezeigten Beispiel versorgt der Akkumulator 7 den Motor 4 mit Strom und ist dazu mit dem Motor 4 durch die Stromleitung 17 verbunden. 1 shows a hammer drill as an exemplary embodiment of the hand-held power tool 1 . The rotary hammer 1 has a tool holder 2, in which a shank end of a tool 3, z. B. a drill can be used. A motor 4 , which drives a percussion mechanism 5 and a drive shaft 6 , forms a primary drive of the hammer drill 1 . An accumulator 7 or a power line (not shown) supplies the motor 4 with power via a power line 17 . in the in 1 The example shown supplies the accumulator 7 with power to the motor 4 and is connected to the motor 4 by the power line 17 for this purpose.

Ein Benutzer kann den Bohrhammer 1 an einem Handgriff 8 halten und führen. Der Handgriff 8 ist Teil eines Gehäuses 9 des Bohrhammers 1. Der Bohrhammer 1 kann mittels eines Haupttasters 10 in Betrieb genommen werden. Durch Betätigen des Haupttasters 10 wird dem Motor 4 von dem Akkumulator 7 über die Stromleitung 17 Strom zugeführt. Durch das Zuführen von Strom an den Motor 4 treibt dieser die Antriebswelle 6 an. Die mit der Werkzeugaufnahme 2 gekoppelte Antriebswelle 6 versetzt die Werkzeugaufnahme 2 in eine Drehbewegung um eine Arbeitsachse 11. Dadurch wird das Werkzeug 3 um die Arbeitsachse 11 gedreht. Während des Betriebs kann der Bohrhammer 1 das Werkzeug 3 zusätzlich zur Drehung um die Arbeitsachse 11 in einer Schlagrichtung 12 längs der Arbeitsachse 11 in einen Untergrund schlagen. Beispielsweise ist der Bohrhammer 1 derart eingerichtet, dass die Schlagbewegung des Werkzeugs 3 erst mit einem Bearbeiten eines Gegenstands einsetzt. Beispielsweise startet durch ein Andrücken des eingeschalteten Bohrhammers 1 gegen den zu bearbeitenden Gegenstand ein Antrieb der Werkzeugaufnahme 2 durch das Schlagwerk 5. Dadurch, dass das Schlagwerk 5 die Werkzeugaufnahme 2 antreibt, führt das Werkzeug 3 zusätzlich zur Drehbewegung um die Arbeitsachse 11 Schlagbewegungen in der Schlagrichtung 12 aus. In einem Ausführungsbeispiel hat der Bohrhammer 1 einen Betriebswahlschalter 13, durch den die Werkzeugaufnahme 2 von der Antriebswelle 6 entkoppelt werden kann, sodass ein rein meißelnder Betrieb des Bohrhammers 1 möglich ist.A user can hold and guide the hammer drill 1 by a handle 8 . The handle 8 is part of a housing 9 of the rotary hammer 1. The rotary hammer 1 can be put into operation by means of a main switch 10. By pressing the main button 10, the motor 4 is supplied with power from the accumulator 7 via the power line 17. By supplying power to the motor 4, the latter drives the drive shaft 6. The drive shaft 6 coupled to the tool holder 2 causes the tool holder 2 to rotate about a working axis 11 . As a result, the tool 3 is rotated about the working axis 11 . During operation, the rotary hammer 1 can hit the tool 3 in addition to rotating about the working axis 11 in a direction of impact 12 along the working axis 11 into a substrate. For example, the hammer drill 1 is set up in such a way that the impact movement of the tool 3 only begins when an object is processed. For example, pressing the switched-on rotary hammer 1 against the object to be machined starts driving the tool holder 2 through the impact mechanism 5. Because the impact mechanism 5 drives the tool holder 2, the tool 3 performs impact movements in the impact direction in addition to the rotary movement about the working axis 11 12 out. In one exemplary embodiment, the rotary hammer 1 has an operating selector switch 13, through which the tool holder 2 can be decoupled from the drive shaft 6, so that purely chiseling operation of the rotary hammer 1 is possible.

Fig. 2 zeigt eine schematische Ansicht eines Verfahrens zum Betreiben des Bohrhammers 1 aus Fig. 1. 2 FIG. 1 shows a schematic view of a method for operating the hammer drill 1. FIG 1 .

In einem ersten Schritt S1 des Verfahrens wird ein durch das Antreiben der Werkzeugaufnahme 2 entstehendes Magnetfeld des Motors 4 erfasst.In a first step S1 of the method, a magnetic field of the motor 4 produced by the driving of the tool holder 2 is detected.

Dazu weist der Bohrhammer 1 benachbart zu dem Motor 4, insbesondere benachbart zu der Stromleitung 17, einen Magnetfeldsensor 14 zur Lasterkennung des Motors 4 auf, wie in Fig. 1 zu sehen. Der für das drehende und/oder schlagende Antreiben der Werkzeugaufnahme 2 erforderliche Strom fließt durch die Stromleitung 17 zu dem Motor 4 und erzeugt ein Magnetfeld um die Stromleitung 17. Der Magnetfeldsensor 14 erfasst das Magnetfeld des Motors 4, insbesondere der Stromleitung 17.For this purpose, the hammer drill 1 has a magnetic field sensor 14 adjacent to the motor 4, in particular adjacent to the power line 17, for detecting the load of the motor 4, as shown in FIG 1 to see. The current required for rotating and/or percussive driving of the tool holder 2 flows through the power line 17 to the motor 4 and generates a magnetic field around the power line 17. The magnetic field sensor 14 detects the magnetic field of the motor 4, in particular of the power line 17.

In einem zweiten Schritt S2 des Verfahrens wird ein Lastzustand des Motors 4 in Abhängigkeit des erfassten Magnetfelds ermittelt.In a second step S2 of the method, a load condition of the motor 4 is determined as a function of the detected magnetic field.

Die Stärke des durch die Stromleitung 17 fließenden Stroms ist von der momentanen Leistungsaufnahme des Motors 4 des Bohrhammers 1 abhängig. Somit ist auch die Stärke des von dem durch die Stromleitung 17 fließenden Stroms erzeugten Magnetfelds von der momentanen Leistungsaufnahme des Motors 4 des Bohrhammers 1 abhängig.The strength of the current flowing through the power line 17 depends on the instantaneous power consumption of the motor 4 of the rotary hammer 1 . The strength of the magnetic field generated by the current flowing through the power line 17 is therefore also dependent on the instantaneous power consumption of the motor 4 of the rotary hammer 1 .

Durch das Betätigen des Haupttasters 10 wird der Motor 4 in eine Drehbewegung versetzt. Solange das Werkzeug 3 das Werkstück noch nicht bearbeitet, also ein Leerlaufbetrieb des Bohrhammers 1 vorliegt, ist die an dem Motor 4 anliegende Last gering und die Leistungsaufnahme des Motors 4 ist entsprechend gering. In diesem Zustand fließt ein Strom mit einer geringen Stromstärke durch den Stromleiter 17, welcher ein schwaches Magnetgeld um den Stromleiter 17 erzeugt. Wenn nun ein Werkstück mit dem Werkzeug 3 bearbeitet wird, steigt die an dem Motor 4 anliegende Last und die von dem Motor 4 aufgenommene Leistung im Vergleich zum Leerlaufbetrieb. Wenn in einem reinen Bohrbetrieb des Bohrhammers 1 das Werkstück mit dem Werkzeug 3 bearbeitet wird, steigt die Stromstärke des durch den Stromleiter 17 fließenden Stroms und die Stärke des von dem Strom erzeugten Magnetfelds um den Stromleiter 17. Wenn zusätzlich zum Bohrbetrieb ein Schlagbetrieb einsetzt, steigt die an dem Motor 4 anliegende Last noch weiter. Bei einem solchen Bohr- und Schlagbetrieb des Bohrhammers 1 ist die Lastaufnahme des Motors entsprechend groß und es fließt ein Strom mit einer großen Stromstärke durch den Stromleiter 17. Dadurch wird ein starkes Magnetgeld um den Stromleiter 17 erzeugt.By pressing the main button 10, the motor 4 is set in rotation. As long as the tool 3 is not yet machining the workpiece, ie the hammer drill 1 is in idling mode, the load applied to the motor 4 is low and the power consumption of the motor 4 is correspondingly low. In this state, a current of a small amperage flows through the current conductor 17, which generates weak magnetic current around the current conductor 17. If a workpiece is now machined with the tool 3, the load applied to the motor 4 and the power consumed by the motor 4 increase in comparison to idling operation. If the workpiece is machined with the tool 3 in a pure drilling operation of the rotary hammer 1, the amperage of the current flowing through the conductor 17 and the strength of the magnetic field generated by the current around the conductor 17 increase the load applied to the motor 4 further. In such a drilling and impact operation of the hammer drill 1, the load of the motor is correspondingly large and a current with a large current flows through the conductor 17. A strong magnetic current around the conductor 17 is thereby generated.

Durch das Erfassen des Magnetfelds um den Stromleiter 17 in dem ersten Schritt S1 des Verfahrens können diese verschiedenen Lastzustände von einer Steuereinrichtung 15 des Bohrhammers 1 in dem zweiten Schritt S2 des Verfahrens ermittelt und unterschieden werden. Insbesondere übermittelt der Magnetfeldsensor 14 das erfasste Magnetfeld als Signal an die Steuereinrichtung 15. Die Steuereinrichtung 15 vergleicht das erfasste Magnetfeld mit bestimmten Grenzwerten und ermittelt so, ob ein Leerlaufbetrieb, ein reiner Bohrbetrieb oder ein Bohr- und Schlagbetrieb vorliegt. Die bestimmten Grenzwerte sind bestimmte Werte für die Magnetfeldstärke. Beispielsweise ermittelt die Steuereinrichtung 15, dass ein Leerlaufbetrieb vorliegt, wenn das erfasste Magnetfeld kleiner als ein erster Grenzwert ist. Beispielsweise ermittelt die Steuereinrichtung 15, dass ein reiner Bohrbetrieb vorliegt, wenn das erfasste Magnetfeld größer oder gleich dem ersten Grenzwert und kleiner als ein zweiter Grenzwert ist. Beispielsweise ermittelt die Steuereinrichtung 15, dass ein Bohr- und Schlagbetrieb vorliegt, wenn das erfasste Magnetfeld größer oder gleich dem zweiten Grenzwert ist.By detecting the magnetic field around the conductor 17 in the first step S1 of the method, these different load states can be determined and differentiated by a control device 15 of the rotary hammer 1 in the second step S2 of the method. In particular, the magnetic field sensor 14 transmits the detected magnetic field as a signal to the control device 15. The control device 15 compares the detected Magnetic field with certain limit values and thus determines whether idle operation, pure drilling operation or drilling and percussion operation is present. The specific limit values are specific values for the magnetic field strength. For example, the control device 15 determines that idle operation is present when the detected magnetic field is less than a first limit value. For example, the control device 15 determines that a pure drilling operation is taking place when the detected magnetic field is greater than or equal to the first limit value and less than a second limit value. For example, the control device 15 determines that a drilling and percussion operation is taking place when the detected magnetic field is greater than or equal to the second limit value.

In einem dritten Schritt S3 des Verfahrens wird eine Betriebszeit des Motors 4 in Abhängigkeit des ermittelten Lastzustands ermittelt.In a third step S3 of the method, an operating time of the engine 4 is determined as a function of the load state determined.

Dazu kann der Bohrhammer 1, insbesondere die Steuereinrichtung 15, beispielsweise einen Betriebszeitzähler 16 zum Erfassen der Betriebszeit des Motors 4 in Abhängigkeit des ermittelten Lastzustands aufweisen, wie in Fig. 1 zu sehen. Die Steuereinrichtung 15 und/oder der Betriebszeitzähler 16 weisen beispielsweise eine Speichereinheit (nicht gezeigt) zum Speichern der erfassten Betriebszeit in Abhängigkeit des ermittelten Lastzustands auf. Der Betriebszeitzähler 16 erfasst beispielsweise ab Betätigen des Hauttasters 10 fortlaufend oder in engen Zeitintervallen die Betriebszeit des Motors 4 und ordnet sie dem von der Steuereinrichtung 15 ermittelten Lastzustand zu. Beispielsweise erfasst der Betriebszeitzähler 16 nach Einschalten des Bohrhammers 1 über den Haupttaster 10 zunächst eine Betriebszeit im Leerlauf, gefolgt von einer Betriebszeit im Bohr- und Schlagbetrieb.For this purpose, the hammer drill 1, in particular the control device 15, can have, for example, an operating time counter 16 for recording the operating time of the motor 4 as a function of the load condition determined, as in 1 to see. The control device 15 and/or the operating time counter 16 have, for example, a storage unit (not shown) for storing the recorded operating time as a function of the ascertained load state. The operating time counter 16 records the operating time of the motor 4 continuously or at short time intervals, for example from the time the main button 10 is actuated, and assigns it to the load state determined by the control device 15 . For example, after the rotary hammer 1 has been switched on via the main button 10, the operating time counter 16 first records an operating time in idle mode, followed by an operating time in drilling and percussion mode.

In einem vierten Schritt S4 des Verfahrens wird der Bohrhammer 1 in Abhängigkeit des ermittelten Lastzustands eingestellt, insbesondere gesteuert. Beispielsweise wird die Motordrehzahl des Motors 4 in Abhängigkeit des ermittelten Lastzustands geändert. Beispielsweise wird die Motordrehzahl in dem Leerlaufbetrieb reduziert und wird die Motordrehzahl in dem Schlag- und Bohrbetrieb erhöht. Durch diese Anpassung der Motordrehzahl an den Lastzustand des Bohrhammers 1 kann der Energieverbrauch des Bohrhammers 1 verringert werden.In a fourth step S4 of the method, the hammer drill 1 is adjusted, in particular controlled, as a function of the determined load condition. For example, the engine speed of the engine 4 is changed depending on the determined load condition. For example, the engine speed is reduced in the idle operation and the engine speed is increased in the percussion and drilling operations. The energy consumption of the hammer drill 1 can be reduced by this adjustment of the engine speed to the load condition of the hammer drill 1 .

BEZUGSZEICHENLISTEREFERENCE LIST

11
Handwerkzeugmaschine (Bohrhammer)Hand tool (hammer drill)
22
Werkzeugaufnahmetool holder
33
WerkzeugTool
44
Motorengine
55
Schlagwerkpercussion
66
Antriebswelledrive shaft
77
Akkumulatoraccumulator
88th
Handgriffhandle
99
GehäuseHousing
1010
Haupttastermain button
1111
Arbeitsachseworking axis
1212
Schlagrichtungimpact direction
1313
Betriebswahlschalteroperation selector switch
1414
Magnetfeldsensormagnetic field sensor
1515
Steuereinrichtungcontrol device
1616
Betriebszeitzähleroperating time counter
1717
Stromleitungpower line
S1S1
Verfahrensschrittprocess step
S2S2
Verfahrensschrittprocess step
S3S3
Verfahrensschrittprocess step
S4S4
Verfahrensschrittprocess step

Claims (11)

  1. Hand-held power tool (1) with
    a tool holder (2),
    a motor (4) for rotational and/or percussive driving of the tool holder (2), and
    a magnetic field sensor (14) for detecting a magnetic field of the motor (4) that is created by the driving of the tool holder, wherein the magnetic field sensor (14) is arranged in the hand-held power tool (1) in such a way that it detects as the magnetic field of the motor (4) a magnetic field of a current that is consumed by the motor (4) when the tool holder is driven, characterized in that the hand-held power tool has a control device (15) for determining a load state of the motor (4) in dependence on the detected magnetic field for differentiation between an idle mode of the hand-held power tool (1) and a load mode.
  2. Hand-held power tool (1) according to Claim 1, characterized in that it has an operating time counter (16) for detecting an operating time of the motor (4) in dependence on the determined load state.
  3. Hand-held power tool (1) according to Claim 1 or 2, characterized in that the control device (15) is set up to set the hand-held power tool (1) in dependence on the determined load state.
  4. Method for operating a hand-held power tool (1), which has a tool holder (2) and a motor (4) for rotational and/or percussive driving of the tool holder (2), comprising the steps of:
    detecting (S1) a magnetic field of the motor (4) that is created by the driving of the tool holder (2), and
    determining (S2) a load state of the motor (4) in dependence on the detected magnetic field,
    characterized in that the determination (S2) of the load state of the motor (4) in dependence on the detected magnetic field comprises a differentiation between an idle mode of the hand-held power tool (1) and a load mode.
  5. Method according to Claim 4, characterized in that the detection (S1) of the magnetic field of the motor (4) comprises detecting a magnetic field of a current that is consumed by the motor (4) when the tool holder (2) is driven.
  6. Method according to Claim 4 or 5, characterized in that a chiseling mode of the hand-held power tool (1) is detected when the determined load state exceeds a specific limit value.
  7. Method according to one of Claims 4 to 6, characterized by a step of:
    determining (S3) an operating time of the motor (4) in dependence on the determined load state.
  8. Method according to one of Claims 6 or 7, characterized in that the hand-held power tool (1) is a hammer drill and the determination (S2) of the load state of the motor (4) in dependence on the detected magnetic field comprises a differentiation between a purely drilling mode and a drilling and impacting mode.
  9. Method according to Claim 4, characterized in that the hand-held power tool (1) is a chisel hammer and the determination (S2) of the load state of the motor (4) in dependence on the detected magnetic field comprises a differentiation between the idle mode and an impacting mode.
  10. Method according to one of Claims 4 to 8, characterized by a step of:
    setting (S4) the hand-held power tool (1) in dependence on the determined load state.
  11. Method according to Claim 10, characterized in that the setting (S4) of the hand-held power tool (1) in dependence on the determined load state comprises a changing of a motor speed of the motor (4) in dependence on the determined load state.
EP19742639.8A 2018-08-07 2019-07-30 Hand-held machine tool and method for operating a hand-held machine tool Active EP3833510B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18187655.8A EP3608063A1 (en) 2018-08-07 2018-08-07 Handheld machine tool and method for operating the same
PCT/EP2019/070477 WO2020030468A1 (en) 2018-08-07 2019-07-30 Hand-held machine tool and method for operating a hand-held machine tool

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EP3833510A1 (en) 2021-06-16
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EP3608063A1 (en) 2020-02-12
WO2020030468A1 (en) 2020-02-13

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