EP2873490A1 - Correction de tension à basse température pour prévenir les interruptions d'alimentation dues aux sous-tensions pour outillage électroportatif alimenté par batterie - Google Patents

Correction de tension à basse température pour prévenir les interruptions d'alimentation dues aux sous-tensions pour outillage électroportatif alimenté par batterie Download PDF

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Publication number
EP2873490A1
EP2873490A1 EP20130193100 EP13193100A EP2873490A1 EP 2873490 A1 EP2873490 A1 EP 2873490A1 EP 20130193100 EP20130193100 EP 20130193100 EP 13193100 A EP13193100 A EP 13193100A EP 2873490 A1 EP2873490 A1 EP 2873490A1
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EP
European Patent Office
Prior art keywords
value
operating
limit
voltage
monitoring
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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.)
Withdrawn
Application number
EP20130193100
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German (de)
English (en)
Inventor
Thomas Müller
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
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to EP20130193100 priority Critical patent/EP2873490A1/fr
Publication of EP2873490A1 publication Critical patent/EP2873490A1/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the present invention relates to a mains-independent power tool, which includes an electric motor for operating the power tool and an accumulator.
  • the power tool includes a monitor for monitoring a monitor operating limit, the monitor operating limit being above an operating limit of the battery.
  • the power tool contains an adjustable resistance component for varying the power output of the electric motor and an operating value controller for setting at least one operating value applied to the electric motor by means of a pulse width modulation (PWM).
  • PWM pulse width modulation
  • the present invention relates to a method of controlling an electric motor in a power tool operated by off-line by timed monitoring of a monitor operating limit by means of a monitor, the monitor operating limit being above an operating limit of an accumulator.
  • the undervoltage shutdown prevents further Using the power tool until the accumulator again outputs a voltage lying at least above the limit value of the supply voltage. Such an interruption of the use of the power tool by the undervoltage shutdown represents a significant adverse for the user, since an undervoltage shutdown is associated with a relatively long wait until the continuation of the use of the power tool.
  • the undervoltage cutoff engages in the control of the electric motor and interrupts the power of the electric motor, at least temporarily, to avoid damage to the accumulator and to the other systems. This leads to unwanted interruptions in the application of the power tool for the user again and again.
  • An object of the present invention is to solve the above-described problem and to provide a power tool operated independently of the mains and a method for controlling an electric motor in a power tool operated independently of the mains to ensure effective use of a rechargeable battery for operating a power tool.
  • a mains-independent power tool which contains an electric motor for operating the power tool and an accumulator.
  • the power tool includes a monitor for monitoring a monitor operating limit, the monitor operating limit being above an operating limit of the battery.
  • the power tool contains an adjustable resistance component for varying the power output of the electric motor and an operating value controller for setting at least one operating value applied to the electric motor by means of a pulse width modulation (PWM).
  • PWM pulse width modulation
  • a PWM duty cycle of the operating value regulator is set for setting the at least one operating value corresponding to a first value or a second value at which the first value can be derived from the current position of the resistance component and the second value to the at least is an operating value last used PWM duty cycle minus an offset value, wherein to reduce the at least one operating value, the lower one of the first or second value for the PWM duty cycle is selected when the at least one operating value of the accumulator is below the monitor operating limit lies.
  • the operating value may be, for example, a voltage value. However, it is also possible that the operating value is the current or the like. Moreover, it is also possible for the operating value to be the operating state, ie the switched-on state or the switched-off state of the power tool.
  • the operating value limit may be adjustable as a function of a temperature value.
  • the temperature value may be, for example, the temperature of the accumulator or the temperature of the electrical appliance. However, it is also possible that the temperature value corresponds to the temperature of the accumulator and the temperature of the electrical appliance. This means that the temperature value can be adjusted either only to the temperature of the rechargeable battery or only to the temperature of the electrical appliance without taking into account the temperature of the rechargeable battery. In addition, it may also be possible that the temperature value results from a combination of the temperature of the accumulator and the temperature of the electrical appliance. Furthermore, it may also be possible for the temperature value additionally or exclusively to take into account the ambient temperature of the accumulator and / or of the electrical appliance for setting the operating value limit.
  • the operating value limit can be set lower or higher. It is provided that at a low temperature value, the operating value limit is set lower, but it should be noted that the operating value limit is always below the monitoring operating limit. Accordingly, at a low temperature value, the duty limit is set higher.
  • the offset value may correspond to a percentage of the last used PWM duty cycle for driving the electric motor.
  • the percentage may correspond to a value between 2% to 20% of the last used PWM duty cycle for driving the electric motor.
  • a higher or lower offset value depending on a temperature value can be used.
  • the temperature value may be, for example, the temperature of the accumulator or the temperature of the electrical appliance.
  • the temperature value corresponds to the temperature of the accumulator and the temperature of the electrical appliance. This means that the temperature value either only to the temperature of the accumulator or only to the temperature of the electrical device without taking into account the temperature of the accumulator is adjustable.
  • the temperature value results from a combination of the temperature of the accumulator and the temperature of the electrical appliance. Furthermore, it may also be possible for the temperature value additionally or exclusively to take into account the ambient temperature of the accumulator and / or of the electrical appliance for setting the operating value limit.
  • a time-controlled monitoring device may be provided for periodically monitoring the at least one operating value of the rechargeable battery.
  • the time-controlled monitoring device can be designed such that the at least one operating value of the accumulator is monitored at intervals.
  • the time interval can correspond to a value between 1 ms to 100 ms.
  • greater or smaller time intervals can be used to monitor the at least one operating value of the accumulator as a function of a temperature value.
  • the temperature value may be, for example, the temperature of the accumulator or the temperature of the electrical appliance.
  • the temperature value corresponds to the temperature of the accumulator and the temperature of the electrical appliance. This means that the temperature value can be adjusted either only to the temperature of the rechargeable battery or only to the temperature of the electrical appliance without taking into account the temperature of the rechargeable battery.
  • the temperature value results from a combination of the temperature of the accumulator and the temperature of the electrical appliance. Furthermore, it may also be possible for the temperature value additionally or exclusively to take into account the ambient temperature of the accumulator and / or of the electrical appliance for setting the operating value limit.
  • the monitoring operating value limit is also possible for the monitoring operating value limit to be realized by a monitoring voltage limit, the operating value limit by an undervoltage limit, the operating value regulator by a voltage regulator and the at least one operating value by the operating voltage.
  • the voltage of a rechargeable battery falls too quickly below the operating value limit of the rechargeable battery, whereby a shutdown of the electric motor to protect the rechargeable battery or other systems can be prevented and at the same time the use of the power tool can be continued.
  • the object is achieved by a method for controlling an electric motor in a power tool operating independently of the mains by a time-controlled monitoring of a monitoring operating limit by means of a monitoring device, wherein the monitoring operating limit lies above an operating value limit of a rechargeable battery.
  • the method comprises setting at least one operating value of the electric motor by setting a PWM duty cycle of an operating value regulator to the lower of a first value or a second value, wherein the first value can be derived from the last position of the resistance component and the second value to the Setting the at least one operating value last used PWM duty cycle minus an offset value corresponds, if the at least one operating value of the accumulator is below the monitoring operating limit.
  • an adjustment of the operating value limit in dependence on a temperature value can be provided.
  • the temperature value may be, for example, the temperature of the accumulator or the temperature of the electrical appliance.
  • the temperature value corresponds to the temperature of the accumulator and the temperature of the electrical appliance. This means that the temperature value can be adjusted either only to the temperature of the rechargeable battery or only to the temperature of the electrical appliance without taking into account the temperature of the rechargeable battery.
  • the temperature value results from a combination of the temperature of the accumulator and the temperature of the electrical appliance.
  • the temperature value additionally or exclusively to take into account the ambient temperature of the accumulator and / or of the electrical appliance for setting the undervoltage limit.
  • the operating value limit can be set lower or higher. It is provided that at a low temperature value, the operating value limit is set lower, but it should be noted that the operating value limit is always below the monitoring operating limit. Accordingly, at a low temperature value, the duty limit is set higher.
  • an adjustment of the offset value can be provided corresponding to a percentage of the last used PWM duty cycle for driving the electric motor.
  • the percentage may correspond to a value between 2% to 20% of the last used PWM duty cycle for driving the electric motor.
  • a higher or lower offset value depending on a temperature value can be used.
  • the temperature value may be, for example, the temperature of the accumulator or the temperature of the electrical appliance.
  • the temperature value corresponds to the temperature of the accumulator and the temperature of the electrical appliance. This means that the temperature value can be adjusted either only to the temperature of the rechargeable battery or only to the temperature of the electrical appliance without taking into account the temperature of the rechargeable battery.
  • the temperature value results from a combination of the temperature of the accumulator and the temperature of the electrical appliance. Furthermore, it may also be possible for the temperature value additionally or exclusively to take into account the ambient temperature of the accumulator and / or of the electrical appliance for setting the undervoltage limit.
  • the time interval can correspond to a value between 1 ms to 100 ms.
  • greater or smaller time intervals can be used for monitoring the at least one operating value of the rechargeable battery as a function of a temperature value.
  • the temperature value may be, for example, the temperature of the accumulator or the temperature of the electrical appliance.
  • the temperature value corresponds to the temperature of the accumulator and the temperature of the electrical appliance. This means that the temperature value can be adjusted either only to the temperature of the rechargeable battery or only to the temperature of the electrical appliance without taking into account the temperature of the rechargeable battery.
  • the temperature value results from a combination of the temperature of the accumulator and the temperature of the electrical appliance. Furthermore, it may also be possible for the temperature value additionally or exclusively to take into account the ambient temperature of the accumulator and / or of the electrical appliance for setting the operating value limit.
  • the monitoring operating value limit may also be possible for the monitoring operating value limit to be determined by a Monitoring voltage limit, the operating value limit by an undervoltage limit, the operating value controller is realized by a voltage regulator and the at least one operating value by the operating voltage. In this way, it can be avoided, in particular, that the voltage of a rechargeable battery falls too quickly below the operating value limit of the rechargeable battery, whereby a shutdown of the electric motor to protect the rechargeable battery or other systems can be prevented and at the same time the use of the power tool can be continued.
  • a power tool 1 which may be a drill, a hammer drill, a grinder, a saw, a planer, an angle grinder o. The like., Shown schematically.
  • the power tool 1 is a cordless drill.
  • the power tool 1 includes a housing 2 with a handle 3.
  • an electric motor 6 which serves to drive a present in a tool holder 7 tool 8, such as a drill.
  • the electric motor 6 may be a DC motor, with the electric motor 6 being supplied with electrical energy by means of a rechargeable energy storage device 9 that can be plugged into the handle 3 and consists of an accumulator (rechargeable battery).
  • a switch 4 On the handle 3 is a switch 4 with a designed as a potentiometer resistance component 5 for varying the speed, torque or the like. the electric motor 6.
  • control device 10 for driving the electric motor 6.
  • the control device 10 has a designed as an operating value regulator voltage regulator 12 which receives the voltage provided by the battery 9 operating value, here in the form of battery voltage to a designed as a voltage regulator input Radio Mosbyreglereingang 12a ,
  • the voltage regulator 12 is equipped with a time-discrete monitoring device 14 for monitoring a designed in the form of a monitoring voltage limit monitoring limit value to reduce the voltage provided by the battery 9 to a variable operating voltage for the electric motor 6.
  • the monitoring device 14 is configured as control electronics. Discrete-time monitoring takes place at regular intervals, for example every 10ms. However, it is also possible depending on the application to set higher or lower periods.
  • the operating voltage is applied to the electric motor 6 via a voltage regulator output 12b of the voltage regulator 12.
  • the operating value limit designed as an undervoltage limit serves as a threshold value for the monitoring device 14, below which the power tool 1 is switched off in order to avoid further discharging of the battery 9 and thus possible damage.
  • the measures provided for the battery 9 monitoring voltage limit in turn serves to intervene in the operation of the power tool 1 regulating when the voltage of the battery 9 has decreased drastically.
  • the regulatory intervention in the operation of the power tool 1 takes place as soon as the voltage of the battery 9, the previously set Monitoring voltage limit falls below.
  • the monitoring voltage limit can be set depending on the respective temperature of the battery 9 and / or the power tool 1, wherein the monitoring voltage limit is set the lower, the lower the temperature.
  • the intervention in the operation of the power tool 1 triggered by the undershooting of the monitoring voltage limit is effected by a lowering of the operating voltage of the power tool 1 by means of the voltage regulator 12.
  • any other operating value of the battery 9, any other monitoring operating limit and / or any other operating value of the power tool 1 can be used.
  • the voltage regulator 12 is designed as a pulse width modulation regulator (PWM regulator), i. the control of the electric motor 4 via a so-called duty cycle (duty cycle).
  • PWM regulator pulse width modulation regulator
  • the voltage regulator 12 is in communication with the switch 4 and with the potentiometer. 5
  • the switch 4 is pressed in direction A.
  • the position of the potentiometer 5 changes, whereupon a signal is sent to the voltage regulator 12.
  • the signal corresponds to the respective position of the potentiometer 5.
  • the further the switch 4 is pressed in the direction A the further increases the speed or the torque of the electric motor 6.
  • the designed as a PWM regulator voltage regulator 12 sends a duty cycle to control the rotational speed and the torque to the electric motor. 6
  • the duty cycle corresponds to the respective position of the switch 4 or of the potentiometer 5.
  • the monitoring device 14 regulates the operation of the electrical device 1.
  • the operating voltage of the electrical appliance 1 is reduced by reducing the DutyCycles so far that the battery voltage is again above the monitoring voltage limit.
  • the power of the electric motor 1, that is, its speed or torque is thereby reduced, but a shutdown because of Risk of undervoltage or deep discharge due to the undervoltage shutdown avoided.
  • the PWM duty cycle of the voltage regulator used for setting the operating voltage for the respective next cycle of the cycle is limited.
  • a PWM duty cycle is selected, which can be derived from the current position of the potentiometer, or which corresponds to the last-used PWM duty cycle minus an offset value, depending on which of these two PWM duty cycles. Cyclen is lower.
  • the offset value may correspond, for example, 10% of the last used duty cycle. However, it is also possible depending on the application to set a higher or lower offset value.
  • the duty cycle is used to control the electric motor 6, which corresponds to the lower of the two duty cycles described above.
  • this lower duty cycle (derived from the new, less widely depressed switch position) is used to adjust the operating voltage.
  • this duty cycle (current duty cycle) Cycle minus an offset value) used to set the operating voltage.
  • the operating voltage of an electrical device 1 can be adjusted so that thereby again a premature undershooting of the monitoring voltage limit and consequently a shutdown by an undervoltage shutdown avoided while the Use of the electrical device 1 can be continued.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Direct Current Motors (AREA)
EP20130193100 2013-11-15 2013-11-15 Correction de tension à basse température pour prévenir les interruptions d'alimentation dues aux sous-tensions pour outillage électroportatif alimenté par batterie Withdrawn EP2873490A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20130193100 EP2873490A1 (fr) 2013-11-15 2013-11-15 Correction de tension à basse température pour prévenir les interruptions d'alimentation dues aux sous-tensions pour outillage électroportatif alimenté par batterie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20130193100 EP2873490A1 (fr) 2013-11-15 2013-11-15 Correction de tension à basse température pour prévenir les interruptions d'alimentation dues aux sous-tensions pour outillage électroportatif alimenté par batterie

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EP2873490A1 true EP2873490A1 (fr) 2015-05-20

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EP20130193100 Withdrawn EP2873490A1 (fr) 2013-11-15 2013-11-15 Correction de tension à basse température pour prévenir les interruptions d'alimentation dues aux sous-tensions pour outillage électroportatif alimenté par batterie

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10272550B2 (en) 2016-02-25 2019-04-30 Milwaukee Electric Tool Corporation Power tool including an output position sensor
WO2024188796A1 (fr) * 2023-03-10 2024-09-19 Festool Gmbh Unité de commande pour une unité d'entraînement d'une machine-outil portative, unité d'entraînement, machine-outil portative et procédé pour faire fonctionner une machine-outil portative

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009102082A2 (fr) * 2008-02-14 2009-08-20 Hitachi Koki Co., Ltd. Outil rotatif électrique, procédé de commande et programme
DE102009041878A1 (de) * 2009-09-07 2011-03-10 C. & E. Fein Gmbh Steuerbarer Gleichstrom-Motor mit modifizierter Kennlinie
WO2011122695A1 (fr) * 2010-03-31 2011-10-06 Hitachi Koki Co., Ltd. Outil électrique
WO2012079936A2 (fr) * 2010-12-15 2012-06-21 Robert Bosch Gmbh Procédé et dispositif permettant de faire fonctionner un outil à main à moteur électrique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009102082A2 (fr) * 2008-02-14 2009-08-20 Hitachi Koki Co., Ltd. Outil rotatif électrique, procédé de commande et programme
DE102009041878A1 (de) * 2009-09-07 2011-03-10 C. & E. Fein Gmbh Steuerbarer Gleichstrom-Motor mit modifizierter Kennlinie
WO2011122695A1 (fr) * 2010-03-31 2011-10-06 Hitachi Koki Co., Ltd. Outil électrique
WO2012079936A2 (fr) * 2010-12-15 2012-06-21 Robert Bosch Gmbh Procédé et dispositif permettant de faire fonctionner un outil à main à moteur électrique

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10272550B2 (en) 2016-02-25 2019-04-30 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US10583545B2 (en) 2016-02-25 2020-03-10 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US11484999B2 (en) 2016-02-25 2022-11-01 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US11813722B2 (en) 2016-02-25 2023-11-14 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US12115630B2 (en) 2016-02-25 2024-10-15 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US12485519B2 (en) 2016-02-25 2025-12-02 Milwaukee Electric Tool Corporation Power tool including an output position sensor
WO2024188796A1 (fr) * 2023-03-10 2024-09-19 Festool Gmbh Unité de commande pour une unité d'entraînement d'une machine-outil portative, unité d'entraînement, machine-outil portative et procédé pour faire fonctionner une machine-outil portative

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