EP3157711A1 - Verfahren zum betreiben eines elektrowerkzeuges - Google Patents
Verfahren zum betreiben eines elektrowerkzeugesInfo
- Publication number
- EP3157711A1 EP3157711A1 EP15719476.2A EP15719476A EP3157711A1 EP 3157711 A1 EP3157711 A1 EP 3157711A1 EP 15719476 A EP15719476 A EP 15719476A EP 3157711 A1 EP3157711 A1 EP 3157711A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electric motor
- speed
- determined
- power tool
- during
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000008859 change Effects 0.000 claims description 16
- 230000004913 activation Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000010009 beating Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000009527 percussion Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
- B25B23/1475—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers for impact wrenches or screwdrivers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/002—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose for special purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
- B25B21/026—Impact clutches
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
-
- 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
- B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
-
- 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
- B25F5/02—Construction of casings, bodies or handles
Definitions
- the invention relates to a method for operating a power tool according to claim 1, a control device for a power tool according to claim 14 and a power tool according to claim 15.
- the object of the invention is to provide an improved method and an improved control device for operating a power tool.
- An advantage of the method described is that a screwing a screw into a workpiece is easier to perform, in particular, a damage of the screw or the workpiece can be avoided.
- This advantage is achieved in that the torque of the electric motor is at least reduced if, after an initial time, the rotational speed of the electric motor exceeds a determined rotational speed limit.
- the idea of the invention tion is to prevent damage to the workpiece and / or the screw by the torque is at least reduced or the electric motor is switched off after the initial time in the impact mode upon detection of an increase in the speed of the electric motor over a speed limit.
- the speed limit can be determined, for example, by tests and stored.
- Screwing the screw into the workpiece is determined. As a result, an individual speed limit can be determined for each screw situation. Thus, it can be ensured that the screwing is not terminated too early and not too late.
- the speed limit By determining the speed limit during screwing the speed limit can be determined individually depending on the screw, in particular depending on the diameter of the screw, the thread of the screw, the type of workpiece, in particular the hardness of the workpiece.
- the speed is determined during an initial period of impact operation when screwing the screw into the workpiece and depending on the determined speed, the speed limit is determined.
- the speed limit can be detected precisely depending on the existing conditions.
- the impact mode is used to tighten the screw.
- the impact mode represents the operating state in which the risk of damage to the screw and / or the workpiece is large. Therefore, it is advantageous to determine the speed limit as a function of the speed during the initial time of the impact mode of the power tool.
- the speed limit is determined depending on a determined maximum speed during the start time.
- the speed limit may be calculated as a function of the maximum speed multiplied by a factor and / or added with a constant.
- a value of the speed or several values of the determined speed can be used to calculate the speed limit.
- a percussion operation of the power tool is detected depending on parameters of the electric tool. For example, a percussion operation of the power tool is detected if the speed is below a third comparison value during a start time and / or the current of the electric motor is above a fourth comparison value. Both the current and the speed can be used as parameters for the precise detection of a beat operation.
- the impact operation can additionally be detected precisely by additionally detecting a measured time interval between two impacts of the impact operation, and if the time interval between two impacts of the impact operation is below a first comparison value.
- a further specification for the detection of the impact operation is achieved in that a striking operation is detected when a standard deviation of the determined rotational speed of the electric motor during the initial time of the impact operation is smaller than a second comparison value.
- a workpiece is detected, which has a predetermined minimum thickness, if during the starting time of the electric tool, the rotational speed of the electric motor is below the third comparison value and the current through the electric motor is above the fourth comparison value.
- the torque of the electric motor after the start time is at least reduced when a predetermined first time has elapsed. In this way, a maximum upper limit for the
- a second method for limiting the torque when screwing a screw using the power tool tool is performed when during the start time after the activation of the power tool the current through the electric motor is below a fifth comparison value, wherein in the second method, an impact operation of the power tool is terminated after a predetermined second period of time.
- This method is used in particular for thin workpieces, for example, the second period of time is shorter than the first time period.
- the second method is performed if, in addition during the start time after the activation of the power tool, a change in the determined speed is outside a predetermined range and / or if a change in the determined current is outside of a second range.
- a change in the determined speed is outside a predetermined range and / or if a change in the determined current is outside of a second range.
- the torque of the electric motor is at least reduced or the electric motor completely switched off, if after the start time a change in the determined speed of the electric motor is outside a predetermined speed range and / or if a change of the detected current outside a predetermined current range lies.
- untypical speed changes and / or current changes are detected and used as a signal for reducing the torque of the electric motor.
- damage to the screw and / or the workpiece can be avoided, especially with a thin workpiece.
- FIGS. 1 shows a schematic cross section through a power tool
- FIG. 3 is a schematic representation of a control circuit for the power tool
- FIG. 4 is a diagram with a time profile of the speed, the current and the voltage of an electric motor for a screwing
- Fig. 5 shows a screw in three different screw-in positions in a workpiece
- FIG. 6 shows a schematic program sequence for controlling the torque of the power tool.
- FIG. 1 shows a schematic illustration of a power tool 10, which is designed in the form of a impact wrench 10.
- the impact wrench 10 has a housing 1 1, which has a cylindrical main body 12 and a handle 15 attached thereto. Opposite to the main body 12, a battery 19 is arranged.
- an electric motor 20 in the form of a brushless DC motor 20 having a planetary gear 24, a spindle 25, a beating-generating mechanism 26 and an anvil 27 is disposed in the main body 12.
- the electric motor 20 serves as a drive source for the rotating impact generating mechanism 26.
- the rotational speed of the electric motor 20 is reduced by means of the planetary gear 24 and then transmitted to the spindle 25.
- the rotational force of the spindle 25 is converted into a rotary impact force by the impact generating mechanism 26, for which a hammer 26h and a compression spring 26b are provided.
- An impact force of the hammer 26h is transmitted to the anvil 27.
- the anvil 27 is rotatably supported about an axis and is driven by the rotational impact force of the hammer 26h.
- the anvil 27 is rotatably supported by a bearing 12j in the housing 1 1, which is disposed on a front side of the main body 12. Thus, the anvil 27 may rotate about the axis of rotation, but not move along the axis of rotation.
- a receptacle 27t is provided on a front side of the anvil 27, in order to receive a screw 61 via an insert.
- the screw 61 represents the tool that is driven by the power tool.
- the handle 15 of the housing 1 1 is covered by an operator to use the power tool 10.
- the handle has a holding portion 15h and a lower end portion 15p, which adjoins the lower end of the handle portion 15h.
- the battery 19 is provided, which supplies the power tool 10 with power.
- a main switch 18 is provided, which has a trigger 18t, which can be operated with a finger.
- the main switch 18 has a switch unit 18s, which switches on or off the power tool. is used.
- the trigger 18t is used to increase a magnitude of the driving of the electric motor 20 depending on the operation travel of the trigger 18t.
- the actuation path of the trigger 18t is detected, for example, by means of the switch unit 18s, for example as a resistance value, and reported to a control circuit (46, FIG. 3).
- the control circuit for example, adjusts a power of driving the electric motor 20. In this way, the rotational speed and / or the torque of the electric motor 20 can be controlled.
- a directional switch 17 is provided above the main switch 18, which determines the direction of rotation of the receptacle 27t.
- the power tool 10 may be clockwise in a clockwise direction, i. H. in normal operation, e.g. for screwing in a screw or in a left direction, d. H. in the counterclockwise direction in a screw-out operation e.g. to unscrew a
- Fig. 2 shows in a further cross-section further details of the power tool 10.
- the hammer 26h of the impact generating mechanism 26 is connected to the spindle 25 via v-shaped first guide grooves 25v, v-shaped second guide grooves 26z and steel balls 25r.
- the first guide grooves 25v are disposed on the outer surface, the first guide grooves 25v having semicircular portions directed outward with the V-shaped openings. Further, in an inner surrounding area of the hammer 26h, opposite to the first guide grooves
- the second guide grooves 26z have a semi-circular cross section with the grooves opened in a forward direction.
- the steel balls 25r are arranged between the first guide grooves 25v and the second guide grooves 26z.
- the hammer 26h is rotatably supported at a predetermined angle with respect to a reference position of the spindle 25, and able to move in the axial direction with respect to a longitudinal axis of the spindle 25.
- the compression spring 26b is in contact with the outer surface of the spindle 25 and the hammer 26h, so that the hammer 26h is biased toward the spindle 25.
- bump projections 26w are formed to generate beats on the anvil 27 at two positions offset by 180 ° from each other. Furthermore, the anvil 27 at the two offset by 180 ° points in the circumferential direction beater arms 27d ( Figure 2), which receive the blows of the impact projections 26w of the hammer 26h.
- the hammer 26h is held by the biasing force of the compression spring 26b on the spindle 25 so that the impact projections 26w of the hammer 26h abut against the striking arms 27d of the anvil 27.
- the screw When screwed in, the screw can reach a position in the workpiece at which a screwing resistance exceeds the torque of the hammer 26h.
- the screw-in resistance is transmitted as torque to the anvil 27.
- the hammer 26h is displaced backward from the spindle against the biasing force of the compression spring 26b, and the hammer's beating projections 26w pass over the beater arms 27d of the anvil 27.
- the beating projections 26w are released from abutment with the beating arms 27d so that the beating projections 26w can freely rotate a specified angle.
- the beating protrusions 26w of the hammer 26h move over the beating arms 27d of the anvil 27, the hammer accelerates its rotary motion.
- FIG. 3 shows a schematic representation of a circuit arrangement of the electric tool 10 of FIG. 1 for driving the electric motor 20, which is designed, for example, as a brushless DC motor and is driven by a drive circuit 40.
- the electric motor 20 has a rotor 22 with permanent magnets and a stator 23 with drive coils 23C.
- Drive circuit 40 is an electrical circuit for driving the electric motor 20 and has a three-phase bridge circuit 45, which has six switching elements 44, for example in the form of field effect transistors. Furthermore, a control circuit 46 is provided, which controls the switching elements 44 of the three-phase bridge circuit 45 in response to the switch unit 18 s.
- the three-phase bridge circuit 45 has three output lines 41 connected to the corresponding control coils 23 c of the electric motor 20.
- the control circuit 46 is configured to drive the switching elements 44 based on signals from magnetic sensors 32 such that electrical current flows sequentially through the drive coils 23c to rotate the rotor 22 at a desired speed and / or torque.
- the control circuit 46 can measure a rotational speed of the electric motor 20 by means of the magnetic sensors 32.
- the control circuit 46 is connected to a measuring device 53, which detects the state of charge of the battery 19, in particular the voltage of the battery 19 and passes it on to the control circuit 46.
- the electronic control circuit 46 is connected to a memory 51.
- Limits, data, characteristics, maps and / or calculation methods and / or formulas are stored in the memory 51.
- the control circuit 46 detects by means of the measuring device 53, the current voltage of the battery 19. Furthermore, the control circuit 46 can measure the current of the electric motor 20 with an ammeter 54 and / or the rotational speed of the electric motor 20 with a tachometer 29. The current and / or speed may be used by the control circuit 46 to determine when a strike operation of the power tool begins. For this purpose, appropriate thresholds or limits for the current of the electric motor and the speed of the electric motor in the storage holes 51, which exceeds the electric motor 20 when a striking operation starts.
- the control circuit 46 is configured to perform a method of operating the power tool to screw a screw into a workpiece, wherein after activation of the power tool, the electric motor is driven to screw the screw into the workpiece, wherein during screwing of the screw during an initial time an impact operation of the power tool, the control circuit 46, the rotational speed of the electric motor is determined, wherein depending on the determined speed
- Control circuit 46 determines a speed limit, wherein after the initial time, a speed of the electric motor is determined, wherein a torque of the electric motor is at least reduced by the control circuit 46 when the determined speed of the electric motor exceeds a predetermined speed limit.
- a map, a characteristic curve, a table or a corresponding calculation method can be used.
- the map, the characteristic curve, the table or the calculation method determine a relationship between the measured during the initial time
- FIG. 4 shows in an uppermost diagram (FIG. 4 a) the time profile of the rotational speed U of the electric motor during a screwing-in process, in a middle diagram (FIG. 4 b) the time profile of the current I during the screwing-in process and in a lower diagram (FIG 4c) shows the time profile of the voltage V which is applied by the control circuit to the electric motor.
- the voltage V to the electric motor is increased with time up to a maximum voltage at a first time t1.
- the voltage V gradually increased up to the maximum voltage.
- other time histories may be chosen for increasing the voltage V during the zeroth phase.
- the speed U of the electric motor rises rapidly, so that after reaching a maximum speed, it slowly drops again slightly until the end of the zeroth phase.
- the current flowing through the electric motor I which is shown in the second diagram ( Figure 4b) increases rapidly after application of the voltage to the electric motor to a maximum value and then drops again to a lower value to the end of zeroth Phase to rise again.
- the button for operating the electric tool is pressed completely. Also during further operation, the button remains completely depressed.
- the zeroth phase lasts from the zeroth time to until the first time t1.
- a first phase follows.
- the first phase lasts from the first time t1 to the second time t2.
- the screw 53 is drilled with the tip into the workpiece 1 10.
- the workpiece 1 10 is formed for example in the form of a metal plate.
- the current I rises slowly, with the applied voltage V remaining constant at the maximum value.
- the speed U of the electric motor fluctuates slightly during the first phase to drop somewhat until the end of the first phase.
- the current I through the electric motor increases slightly towards the end of the first phase 1.
- the drilling operation is performed in the workpiece 110 without requiring a hammering operation of the power tool.
- the second phase 2 in which the screw 53 cuts a thread in the workpiece 1 10 begins. This process requires a higher torque so that the impact mechanism of the power tool is activated and the current through the power tool increases. In addition, the speed decreases.
- the period of time for the second phase 2 may be very short, including, for example, only two or three threads.
- the second phase 2 lasts from the second time t2 to a third time t3. After the thread has been inserted into the workpiece 110 by the screw 53.
- a third phase in which the screw 53 is screwed into the cut thread of the workpiece 1 10 begins.
- the speed increases significantly and the power drops significantly.
- the screw resistance is low, so that the speed increases sharply and the power drops sharply.
- a fourth phase 4th reaches the head 1 15 of the screw 53rd the top 1 16 of the workpiece 1 10, so the Einschraubwiderstand increases quickly and significantly.
- the impact mode of the power tool is reactivated and the screw 53 is tightened with a high torque.
- the speed of the electric motor increases again as in the second phase 2 and the current drops again.
- An advantage of the described method consists in the fact that during the fourth phase 4, the control circuit 46 of the power tool detects that the rotational speed of the electric motor exceeds the determined rotational speed limit, so that the control circuit 46 reduces the voltage for the electric motor and / or a clutch between the electric motor and the recording of the screw opens.
- This situation occurs at the end of the fourth phase 4 at a fifth time t5.
- the maximum voltage may be in the range of 3.3V and after the fourth zone 4 may drop to a voltage of 2.2V, for example.
- the voltage can be completely switched off or at least fall below a value at which the electric motor rotates. This value may, for example, be in the range of 1.8 V.
- FIG. 6 shows a schematic diagram of a program sequence for operating the electric motor.
- program point 200 which is optional, a voltage of the battery 19 is detected by the control circuit 46, with which the electric motor of the power tool is driven.
- program point 205 the electric motor according to the zeroth phase of FIG supplied with increasing voltage.
- the voltage can also be increased in one step to the maximum voltage.
- the query is made as to whether the current through the electric motor is greater than a fourth comparison value.
- the fourth comparison value may be between 10 A and 20 A.
- the query as to whether the rotational speed of the electric motor is smaller than a third comparison value.
- the third comparison value may be between 8,000 and 20,000 revolutions per minute.
- the third and fourth comparison values are stored in the memory 51. If both queries are fulfilled, the program branches to program point 215.
- the first limit can be in the range of 0.01 second to 0.05 second.
- the first limit value is stored in the memory 51.
- the beats can be detected acoustically, for example, by means of sound sensors or be determined on the basis of the time profile of the current through the electric motor.
- a standard deviation of the measured speed is smaller than a second limit value.
- the second limit may range between 30 and 90.
- the second limit is stored in the memory 51. If both queries are fulfilled by program item 215, striking operation of the power tool is clearly recognized and a branch is made to program point 220.
- the limits are determined experimentally and can be changed from power tool to power tool e.g. vary depending on the type of electric motor.
- the standard deviation can be calculated, for example, according to the following formulas:
- T of a random variable A ' is defined as the square root of the variance Var ( ⁇ ) :
- the rotational speed of the electric motor is detected.
- a time profile of the rotational speed and / or individual values of the rotational speed at time intervals or a maximum value of the rotational speed are detected.
- a speed limit is determined at program point 222 depending on the detected speed.
- the speed limit can be determined, for example, depending on the detected maximum speed, the detected speed values and / or depending on the time course of the speed during the measurement at program point 220.
- the characteristic curves, characteristic diagrams and / or calculation methods and / or formulas of the memory 51 are used. In a simple case, the speed limit is calculated by multiplying the measured maximum speed by a constant greater than 1.
- a constant speed value can be taken into account in addition to the detected speed.
- the constant speed value is stored in the memory 51.
- the speed limit can be calculated, for example, from the determined maximum speed by adding the constant speed value.
- the speed value may e.g. in the range between 200 and 1000 revolutions per minute.
- a map, a characteristic, a table or a corresponding calculation method can be used, which are stored in the memory.
- the speed limit is determined in one embodiment, depending on the state of charge of the battery, which was optionally determined at program point 200.
- the state of charge of the battery can be taken into account, for example, in the form of a second factor.
- the determined speed limit with the second Multiplied factor can be determined at program point 220 only after a predetermined waiting time of, for example, 0.1 to 0.2 s.
- a predetermined speed limit can be stored in the memory, which is independent of the speed during the impact operation, and which is used in a simple embodiment as the determined speed limit.
- a subsequent program item 225 is checked whether the currently determined or measured speed of the electric motor exceeds the determined speed limit, or whether a predetermined second time has elapsed since detecting the impact operation.
- the second time period can be, for example, in the range between 0.1 and 0.3 s.
- the program branches to program point 230.
- a torque of the electric motor is reduced by the control circuit 46, whereby, for example, the voltage of the electric motor is reduced and / or a coupling between the electric motor and the drive is opened.
- the program branches to program point 240.
- Change in speed and / or a change in the current are within predetermined ranges. If this is not the case, the program branches to program point 230.
- the predefined areas are stored in the memory.
- branching from program point 240 to program point 230 after a predetermined maximum screwing can be in the range of 0.1 and 0.3 seconds.
- the time duration between two beats is smaller than a first limit value.
- the first limit can be in the range of 0.01 second to 0.05 second.
- the first limit value is stored in the memory 51.
- the beats can be detected acoustically, for example, by means of sound sensors or determined on the basis of the time course of the current through the electric motor.
- a standard deviation of the measured speed is smaller than a second limit value.
- the second limit may range between 30 and 90.
- the second limit is stored in the memory 51. If both queries of program point 240 are fulfilled, a striking operation of the power tool is clearly recognized.
- the limits are determined experimentally and can vary from power tool to power tool depending on the type of electric motor, for example.
- the control circuit 46 reduces the torque of the electric motor, wherein, for example, the voltage of the electric motor is reduced and / or a coupling between the electric motor and the drive is opened. Subsequently, after a predetermined period of time, it is possible to branch to the end point 235 at which the electric motor is switched off or at least the voltage is reduced so much that the electric motor no longer rotates.
- the power tool may be configured to indicate whether the method according to program step 215 or the method according to program step 240 is performed.
- the method according to program step 215 indicates a thick workpiece having a predetermined minimum thickness.
- the method of FIG. 240 indicates a workpiece that is thinner than the predetermined minimum thickness.
- the display can be visual, acoustic or haptic.
- the program steps 215 and 220 are performed during the phase 2 of FIG. 4.
- Program step 225 is performed during phase 4 of FIG. 4.
- the program step 240 may be performed during phases 2 through 4 of FIG. 4.
- program item 215 can be dispensed with, depending on the selected embodiment, so that, starting from program item 210, the program item 220 is changed directly to program item 220.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Control Of Electric Motors In General (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014211891.3A DE102014211891A1 (de) | 2014-06-20 | 2014-06-20 | Verfahren zum Betreiben eines Elektrowerkzeuges |
PCT/EP2015/059679 WO2015193022A1 (de) | 2014-06-20 | 2015-05-04 | Verfahren zum betreiben eines elektrowerkzeuges |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3157711A1 true EP3157711A1 (de) | 2017-04-26 |
EP3157711B1 EP3157711B1 (de) | 2020-10-28 |
Family
ID=53016609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15719476.2A Active EP3157711B1 (de) | 2014-06-20 | 2015-05-04 | Verfahren zum betreiben eines elektrowerkzeuges |
Country Status (6)
Country | Link |
---|---|
US (1) | US10293469B2 (de) |
EP (1) | EP3157711B1 (de) |
JP (1) | JP6356344B2 (de) |
CN (1) | CN107073692B (de) |
DE (1) | DE102014211891A1 (de) |
WO (1) | WO2015193022A1 (de) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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US9908182B2 (en) | 2012-01-30 | 2018-03-06 | Black & Decker Inc. | Remote programming of a power tool |
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CN107073692B (zh) | 2020-03-03 |
CN107073692A (zh) | 2017-08-18 |
EP3157711B1 (de) | 2020-10-28 |
JP6356344B2 (ja) | 2018-07-11 |
WO2015193022A1 (de) | 2015-12-23 |
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