WO2020175007A1 - Engin de chantier électrique - Google Patents

Engin de chantier électrique Download PDF

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Publication number
WO2020175007A1
WO2020175007A1 PCT/JP2020/003663 JP2020003663W WO2020175007A1 WO 2020175007 A1 WO2020175007 A1 WO 2020175007A1 JP 2020003663 W JP2020003663 W JP 2020003663W WO 2020175007 A1 WO2020175007 A1 WO 2020175007A1
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WO
WIPO (PCT)
Prior art keywords
motor
rotation speed
control
working machine
driving
Prior art date
Application number
PCT/JP2020/003663
Other languages
English (en)
Japanese (ja)
Inventor
勇樹 ▲高▼橋
秀幸 橋本
弘識 益子
裕太 野口
Original Assignee
工機ホールディングス株式会社
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 工機ホールディングス株式会社 filed Critical 工機ホールディングス株式会社
Priority to JP2021501796A priority Critical patent/JP7180746B2/ja
Priority to DE112020000307.8T priority patent/DE112020000307T5/de
Priority to CN202080009589.5A priority patent/CN113316500B/zh
Publication of WO2020175007A1 publication Critical patent/WO2020175007A1/fr

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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
    • 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
    • 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 an electric working machine such as a hammer drill.
  • An electric working machine such as a hammer drill rotates a tip tool by driving a motor to form a hole in a work material (for example, concrete, steel, wood, etc.) or apply a striking force to the tip tool. It can be crushed by adding it.
  • a work material for example, concrete, steel, wood, etc.
  • the tip tool is caught in a hard place of the work material during work and the tip tool is locked.
  • the accessory tool locks a kickback occurs in which the housing is largely swung by the drive of the accessory tool.
  • Patent Document 1 JP-A-2019-005847
  • the control of the electric work machine can be controlled even when swinging is not actually occurring. There was a risk that the motor would stop because it mistakenly determined that the part was swung. If the motor is driven for a certain period of time or more to warm up, the lubricant will be warmed up and the above problems will be solved.However, if the motor stops before it warms up sufficiently, the There was a problem that the motor could not be warmed up even after repeated starting. In addition, the load on the motor increases when the lubricant temperature is low, so even if the work load is not a problem, the lubricant load is combined with the work load to activate the overload detection function and There was a risk that it would stop.
  • the present invention has been made in view of such a situation, and an object thereof is to provide an electric working machine capable of suppressing a decrease in workability when the working environment is low temperature. ..
  • One embodiment of the present invention is an electric work machine.
  • the electric working machine includes a motor, a control unit that controls the drive of the motor, and a rotation speed detection unit that detects the rotation speed of the motor. If the low temperature determination condition indicating that the ambient temperature of the above-mentioned ambient temperature is low is not satisfied, the first startup control is performed, and if the low temperature determination condition is satisfied, the second startup control is performed.
  • the low temperature determination condition is that a first predetermined time has elapsed from the start of driving the motor. ⁇ 2020/175007 3 ⁇ (:171? 2020 /003663
  • the rotation speed of the motor may be less than the first rotation speed.
  • the temperature detection unit may include a temperature detection unit that detects the ambient temperature, and the low temperature determination condition may include a condition related to a detection value of the temperature detection unit.
  • control unit may reduce the rotation speed of the motor when a first predetermined condition is satisfied.
  • the first predetermined condition may include that the rotation speed of the motor is less than a second rotation speed when a second predetermined time has elapsed from the start of driving the motor.
  • a housing that houses the motor and the control unit, and a tip tool that operates by the driving force of the motor, the control unit, when the first predetermined condition is satisfied, It may be determined that the housing has been swung by the operation of the tip tool.
  • a clutch unit may be provided that disconnects a transmission path that transmits the driving force of the motor to the tip tool when the load applied to the tip tool is equal to or greater than a predetermined value.
  • control unit may not reduce the rotation speed of the motor even when the first predetermined condition is satisfied.
  • control unit may reduce the rotation speed of the motor when a second predetermined condition is satisfied.
  • the first predetermined condition includes that the rotation speed of the motor is less than a second rotation speed when a third predetermined time has elapsed from the start of driving the motor
  • the second predetermined condition is It may include that the rotation speed of the motor when the third predetermined time has elapsed from the start of driving the motor is less than a third rotation speed that is lower than the second rotation speed.
  • control unit may gently increase the effective value of the voltage applied to the mower, as compared with the first startup control.
  • FIG. 1 A perspective view of an electric working machine 1 according to a first embodiment of the present invention.
  • FIG. 2 Side sectional view of the electric working machine 1.
  • FIG. 3 Circuit block diagram of electric work machine 1.
  • FIG. 5 Changes in the number of revolutions of the motor 6 of the electric working machine 1 from the start up to 120 ( ⁇ 60 elapses). The graph shown with the second rotation speed.
  • FIG. 6 Regarding Embodiment 2 of the present invention, a change in the number of rotations of the motor 6 at the time of low temperature and occurrence of kickback is added to FIG. 5, and a third number of rotations for kickback determination at low temperature is added. Graph with added.
  • FIG. 7 A control flow chart of the electric working machine according to the second embodiment.
  • Embodiment 1 This embodiment relates to an electric working machine 1.
  • the electric working machine 1 is characterized in that the start control of the motor 6 is changed depending on whether the ambient temperature of the motor 6 is low or not, and false kickback detection at low temperature is suppressed.
  • the start-up control is control in the process of increasing the rotation speed of the motor 6 up to the target rotation speed from the start of driving the motor 6.
  • Figure 2 defines the front-back and up-down directions of the electric work machine 1.
  • the electric working machine 1 is a hammer drill with a cord that operates with the power supplied from an external AC power source.By applying a turning force and a striking force to the tip tool 19, a work material such as concrete or stone is cut. ⁇ 2020/175007 5 ⁇ (: 171-1? 2020 /003663
  • the outer shell of the electric working machine 1 is composed of a housing 2 and a gear case 3.
  • the housing 2 is, for example, a resin molded body.
  • the gear case 3 is made of metal such as aluminum.
  • the gear case 3 is provided with a side handle 4.
  • the housing 2 includes a motor housing 2 3 housing the motor 6 and the like, and a handle portion 2 spoon the operator to grip.
  • the operation panel 8 includes a speed switching button 8 3 and a speed display section 8. The operator can switch the rotation speed of the motor 6 by using the speed switching button 83.
  • the current rotation speed of motor 6 is! _ Displayed on the speed display section 8 13 such as Mimiguchi.
  • a trigger switch 7 is provided on the upper end of the handle portion 2 for the operator to instruct the motor 6 to drive and stop.
  • a power cord 27 for connecting to an external AC power source extends from the lower end of the handle 2.
  • a filter substrate 21 is provided in the handle portion 2.
  • Motor 6 is the motor housing It is contained within. Above and behind the motor 6, (3 / 0 (3 conversion circuit board 29 is provided. In front of the stator of the motor 6, a control board 22 and an inverter board 25 are provided. The output shaft of the motor 6 6 3 passes through the control board 2 2 and the inverter board 25.
  • a fan 2 3 for cooling is provided at the front of the output shaft 6 3. The fan 2 3 connects with the output shaft 6 8.
  • the fan 23 is provided with a plurality of magnets 24. The magnet 24 faces the fan 23 and faces the control board 22.
  • the gear case 3 houses a power transmission mechanism that transmits the rotation of the motor 6 to drive (rotate and strike) the tip tool 19. Since the structure of this power transmission mechanism is well known, only a brief description will be given below.
  • a gear 9 is provided at the front end of the output shaft 63 of the motor 6.
  • the rear end of the intermediate shaft 11 is provided with a gear 10 that engages with the gear 9.
  • the intermediate shaft 11 is provided with a first clutch member 12, a second clutch member 13 and a reciprocating bearing 26 as a reciprocating motion converting mechanism.
  • the first clutch member 12 transmits the rotation of the intermediate shaft 11 to the reciprocating bearing 26. ⁇ 2020/175007 6 ⁇ (:171? 2020/003663
  • the second clutch member 13 switches whether or not the rotation of the intermediate shaft 11 is transmitted to the gear 14 provided on the outer peripheral portion of the cylinder 28.
  • the transmission and interruption of rotation by the first clutch member 12 and the second clutch member 13 can be switched by an operator by a change lever (not shown) facing the outside of the gear case 3.
  • the reciprocating bearing 26 converts the rotation of the intermediate shaft 11 into a reciprocating motion in the front-rear direction and transmits the reciprocating motion to the piston 15.
  • the piston 15 is provided in the cylinder 28. Inside the piston 15, an air chamber 16 and a striker (striking element) 17 are provided in order from the rear. A second hammer (meson) 18 is provided in front of the striker 17.
  • the air in the air chamber 16 is compressed by the forward movement of the piston 15 and the striker 17 is moved forward by the pressure (positive pressure) of the compressed air.
  • the striker 17 moving forward hits the second hammer 18 and the second hammer 18 moving forward hits the tip tool 19 with its striking force.
  • the air in the air chamber 16 expands due to the backward movement of the piston 15 and the striker 17 moves backward due to the pressure (negative pressure) of the expanded air.
  • the striker 17 reciprocates back and forth due to the fluctuation (compression/expansion) of the air pressure in the air chamber 16 caused by the reciprocating movement of the piston 15, and the striker 17 hits the second hammer 18 to strike the second hammer. 1 8 strikes the tip tool 1 9.
  • the cylinder 28 is rotationally driven by the rotation of the gear 14 to which the rotation of the intermediate shaft 11 is transmitted.
  • the tool holder 5 provided in front of the cylinder 28 and the tip tool 19 held by the tool holder 5 rotate together with the cylinder 28.
  • a gear 14 and a slip clutch mechanism 20 are provided on the outer periphery of the cylinder 28. The slip clutch mechanism 20 slips when the torque of the gear 14 exceeds a certain level, and cuts off the rotation transmission between the gear 14 and the cylinder 28.
  • the electric working machine 1 has three operation modes of a striking mode, a rotating striking mode, and a rotating mode.
  • the striking mode the rotation transmission by the first clutch member 12 is valid and the rotation transmission by the second clutch member 13 is invalid.
  • the rotation transmission of both the first clutch member 12 and the second clutch member 13 is transmitted. ⁇ 2020/175007 7 ⁇ (: 171-1? 2020/003663
  • FIG. 3 is a circuit block diagram of the electric working machine 1.
  • the AC power supply 31 is an external power supply that supplies electric power to the electric working machine 1.
  • the filter circuit 3 2 is provided on the filter substrate 21 of FIG. 2, and is provided between the connection terminals of the AC power supply 3 1 on the circuit.
  • the filter circuit 32 comprises a capacitor ⁇ 1 and an inductor !_ 1.
  • the filter circuit 32 filters high-frequency noise generated by switching elements such as the inverter circuit 35 and the 80/OO conversion circuit 33 described later so as not to affect the AC power supply 31 side.
  • the ⁇ / ⁇ conversion circuit 33 is provided on the ⁇ / ⁇ conversion circuit board 29 of FIG.
  • the eight-thousand-third conversion circuit 33 converts the AC voltage supplied from the AC power supply 31 into a DC voltage by the diode bridge circuit, and smoothes the DC voltage by the electrolytic capacitor 02 after conversion.
  • the control circuit voltage supply circuit 34 converts the voltage rectified and smoothed by the diode bridge and the electrolytic capacitor 02 into a DC voltage of a predetermined voltage and supplies the DC voltage to the control circuit unit 40.
  • the inverter circuit 35 includes a switching element 0 1 6 is a three-phase bridge-connected circuit that switches the output voltage of the 80/ ⁇ conversion circuit 33 and supplies it to the stator coil of the motor 6.
  • the inverter circuit 35 is provided on the inverter board 25 of FIG.
  • the resistance is provided in the current path of the motor 6.
  • a temperature detecting element (temperature detecting means) 48 such as a thermistor is provided in the vicinity of the inverter circuit 35 or in the vicinity of the motor 6, and transmits the temperature detection value to the microcomputer 45.
  • the three holes 047 are provided on the control board 22 of FIG. 2 and face the magnet 24 provided on the fan 23. Hall 047 outputs a signal according to the rotation of fan 23, that is, the rotation of motor 6.
  • Each circuit component forming the control circuit unit 40 is provided on the control board 22 of FIG.
  • the motor current detection circuit 41 detects the current of the motor 6 by the voltage across the resistor and sends it to the microcomputer (micro controller) 45 as a control section.
  • the step-down circuit 4 2 is connected to the control circuit voltage supply circuit 3 4. ⁇ 2020/175 007 8 ⁇ (: 171-1? 2020 /003663
  • the output voltage is stepped down and supplied to the microcomputer 45.
  • the control signal output circuit 4 3 follows the control of the microcomputer 4 5 and switches the switching element of the inverter circuit 35. Apply a control signal (driving signal), eg, ⁇ /! ⁇ /1 signal to each gate of 6.
  • the hall signal detection circuit 44 receives the output signal of the hall sensor 47 and sends a signal according to the rotation position of the motor 6 to the microcomputer 45.
  • Microcomputer 45 is a II, timer, The drive of the motor 6 is controlled by controlling the control signal output circuit 43 according to the current and rotational position of the motor 6 and the temperature.
  • FIG. 4 is a control flow chart of the electric working machine 1. This flow chart is started when the operator turns on the trigger switch 7. My computer 45 starts driving motor 6 (3 1).
  • the microcomputer 4 5 confirms whether the rotation speed of the motor 6 is 1,8001 ⁇ 111 or more as the first rotation speed when 3011 ⁇ as the first predetermined time has elapsed from the start of driving the motor 6 (33). Yes (3 5).
  • the microcomputer 45 determines that the ambient temperature of the motor 6 is normal temperature when the number of rotations of the motor 6 is 1,8001 ⁇ 111 or higher (6 of 35), and the second predetermined time from the start of driving the motor 6 is determined.
  • 9011 ⁇ as time has passed (37) it is confirmed whether or not the rotation speed of the motor 6 is 3,5001 ⁇ 111 or less as the second rotation speed (39).
  • the microcomputer 45 determines that the tool 6 swings the main body and kicks the motor 6. Stop (3 1 1).
  • the microcomputer 45 determines the ambient temperature of the motor 6. It is judged that the temperature is low and the motor 6 continues to be driven unless the trigger switch 7 is turned off (3 1 3 1 ⁇ 10), and when the trigger switch 7 is turned off (3 1 3 6 3 6). ), Stop motor 6 (3 15).
  • the microcomputer 4 5 determines that kickback has not occurred if the number of rotations of the motor 6 is 90,500 ⁇ or less after the motor 6 starts to drive 3,5001 ⁇ 111 or less (N 0 of 39).
  • FIG. 5 shows 120111 from the start of the motor 6 in the electric working machine 1.
  • 6 is a graph showing changes in the number of revolutions up to the lapse of time in various cases, together with a first number of revolutions for low temperature determination and a second number of revolutions for kickback determination at room temperature. There are various cases in which the number of revolutions of the motor 6 changes when kickback occurs, so in Fig. 5, three patterns are also shown.
  • Room temperature and low temperature are the descriptions regarding the ambient temperature of the motor 6. When the motor 6 is not driven for a long time, the ambient temperature of the motor 6 matches the ambient temperature, but when the motor 6 is driven, the ambient temperature of the motor 6 becomes higher than the ambient temperature.
  • the microcomputer 4 5 drives the motor 6 Whether or not the number of rotations of the motor 6 is 1,800 "111 or more when 3011 ⁇ has passed from the start (corresponding to 34 in Fig. 4), that is, the low temperature judgment indicating that the ambient temperature of the motor 6 is low.
  • Judgment is made as to whether the ambient temperature of the motor 6 is normal temperature or low temperature depending on whether or not the condition is satisfied.
  • the microcomputer 45 determines whether 3011 ⁇ has elapsed from the start of driving the motor 6. When the rotation speed of the motor 6 is 1, 800 111 or more, it is determined that the ambient temperature of the motor 6 is room temperature, and the first start control is performed. If it is less than 8001 ⁇ 111, it is determined that the ambient temperature of Mode 6 is low, and the second startup control is performed.
  • the microcomputer 45 determines the rotation speed of the motor 6 when 9011 ⁇ has elapsed from the start of driving the motor 6. If it exceeds 3,500”, it is determined that there is no kickback and the motor 6 continues to be driven. The microcomputer 45 determines that if the speed of the motor 6 at that time is 3,5001 ⁇ 111 or less. It is determined that kickback has occurred, and the rotation speed of the motor 6 is reduced.In step 311 of Fig.
  • the motor 6 is stopped as an example of reducing the rotation speed of the motor 6. On the other hand, the rotation speed is reduced to 0.)
  • the microcomputer 45 determines that 9011 ⁇ has elapsed from the start of driving the motor 6. Whether or not kickback has occurred is not determined based on the number of rotations of the motor 6. As a result, the number of rotations of the motor 6 at the time when 90111 has elapsed from the start of driving the motor 6 during normal startup at low temperature is 3,500 "111 or less.
  • the microcomputer 45 does not make an erroneous determination that kickback is occurring 9011 ⁇ has elapsed from the start of driving the motor 6 even during normal startup at low temperature.
  • the rotation speed of the motor 6 at that time is 3,5001 ⁇ 111 or less, the rotation speed may be slightly lowered.
  • the microcomputer 45 determines whether or not kickback occurs depending on the rotation speed of the motor 6 when 9011 ⁇ has elapsed from the start of driving the motor 6 when the ambient temperature of the motor 6 is low. Therefore, it is possible to prevent the motor 6 from being stopped by erroneously detecting that kickback has occurred even though the kickback has not occurred. As a result, it is possible to suppress a decrease in workability when the work environment is low.
  • whether the ambient temperature of the motor 6 is low or not depends on whether the rotation speed of the motor 6 is 1, 8001 ⁇ 111 or more when 3011 ⁇ has elapsed from the start of driving the motor 6. Instead of determining whether the ambient temperature of the motor 6 is low, it may be determined based on the output signal of the temperature detecting element 48. Temperature detection element 48 ⁇ 2020/175007 1 1 ⁇ (: 171-1? 2020/003663
  • the microcomputer 45 uses the output signal of the temperature detection element 48 to detect the ambient temperature of the motor 6. It can be determined whether the temperature is low.
  • Embodiment 2 The mechanical configuration and circuit configuration of the electric working machine of the present embodiment are the same as those of the electric working machine 1 of Embodiment 1 shown in FIGS. 1 to 3.
  • the electric working machine according to the present embodiment unlike the electric working machine 1 according to the first embodiment, when the ambient temperature of the motor 6 is low, the presence or absence of kickback is determined under conditions different from those at room temperature.
  • FIG. 6 relates to the second embodiment of the present invention, and in addition to FIG. 5, changes in the number of rotations of the motor 6 at the time of low temperature and when kickback occurs, and the third time for kickback determination at low temperature is added. It is the graph which added the number of turns.
  • the microcomputer 4 5 determines that the rotation speed of the motor 6 exceeds 2,000" when 9011 ⁇ has elapsed from the start of driving the motor 6. Determines that there is no kickback and continues to drive the motor 6. The microcomputer 4 5 determines that a kickback has occurred when the number of revolutions of the motor 6 at the same time is 2,000 "or less, and Reduce the speed (eg stop motor 6).
  • FIG. 7 is a control flow chart of the electric working machine according to the second embodiment.
  • the number of revolutions of the motor 6 when 3011 ⁇ has passed from the start of driving the motor 6 is not 1,8001 ⁇ 111 or more (1 of 5 of 35), the ambient temperature of the motor 6 is low. It is judged that there is 9011 ⁇ as the third predetermined time from the start of driving the motor 6. ⁇ 2020/175007 12 ⁇ (: 171-1? 2020/003663
  • the rotation speed of the motor 6 is 2, 0001 ⁇ (11 or less as the 3rd rotation speed or not (3 2 3).
  • the microcomputer 4 5 is the rotation speed of the motor 6. If is less than 2,000 1 ⁇ 111 (3 6 of 3 2 3), it is judged that the kickback that swings the main body by the accessory tool 19 has occurred, and the motor 6 is stopped (3 2 5). If the rotation speed of the motor 6 is not less than 2, 0001 ⁇ 111 when 9011 ⁇ has passed from the start of driving the motor 6, the kickback does not occur in Mykon 4 5 (N 0 of 3 2 3). If the trigger switch 7 is not turned off, the motor 6 continues to be driven (3 1 3 1 ⁇ 10), and when the trigger switch 7 is turned off (3 1 3 ⁇ 6 3), the motor 6 is turned on. Stop (3 15).
  • kickback control control for lowering the rotation speed of motor 6 when kickback occurs
  • the third rotation speed which is the threshold value for determining the presence of kickback when the ambient temperature of the motor 6 is low
  • the speed is set to 2,0001 ⁇ 111, which is lower than the rotation speed, false detection of kickback can be suppressed.
  • the second predetermined time and the third predetermined time are set to the same 9011 ⁇ in the present embodiment, they may be set to different times.
  • the electric working machine according to the present embodiment has the same mechanical configuration and circuit configuration as the electric working machine 1 according to the first embodiment shown in FIGS. 1 to 3.
  • the electric working machine according to the present embodiment differs from the electric working machine 1 according to the first embodiment in that the effect of the voltage applied to the motor 6 when the ambient temperature of the motor 6 is low is lower than that at the normal temperature. Gradually increase the value toward the target value.
  • the microcomputer 45 determines whether the ambient temperature of the motor 6 is low based on the rotation speed of the motor 6 or the output signal of the temperature detection element 48 when 3011 ⁇ has elapsed from the start of driving the motor 6.
  • the duty of the ⁇ /1 ⁇ /1 signal applied to the switching elements ⁇ 1 to ⁇ 6 of the inverter circuit 35 is the ambient temperature of the motor 6 at room temperature. Gradually increase toward the target value as compared with some cases.
  • the rotation speed of the motor 6 becomes gradually higher toward the target rotation speed than when the ambient temperature of the motor 6 is normal temperature.
  • the overload protection function may be activated and the motor 6 may stop, or the peak current at startup of the motor 6 may increase and electrical components may fail.
  • the ambient temperature of the mobile phone 6 is low, the duty is increased more gently than when the ambient temperature is low, so that such a problem can be suppressed and the working environment is low. In this case, it is possible to suppress a decrease in workability. In addition, it is possible to suppress the occurrence of hitting defects due to the low working environment.
  • the kickback control described in the first and second embodiments can be applied to other types of electric working machines in which a kickback in which the housing is swung by the drive of the tip tool may occur in addition to the hammer drill. ..
  • the control for gradually increasing the duty when the ambient temperature of the motor 6 is low as compared with the case where the ambient temperature is low can be applied to an electric working machine in which kickback does not occur.
  • specific values such as the rotation speed of the motor 6 and the elapsed time from the start of driving the motor 6 described in the embodiment can be appropriately changed by design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Power Tools In General (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

La présente invention concerne un engin de chantier électrique susceptible de supprimer une réduction de l'aptitude à travailler lorsqu'un environnement de travail est un environnement à basse température. Une machine de travail électrique (1) est pourvue d'un moteur (6) et d'un micro-ordinateur (45) qui commande l'entraînement du moteur (6). Lors d'une commande de démarrage du moteur (6), le micro-ordinateur (45) effectue une première commande de démarrage lorsque la vitesse de rotation du moteur (6) est supérieure ou égale à une première vitesse de rotation, à un instant auquel un premier temps prescrit depuis le début d'entraînement du moteur (6) s'est écoulé, et effectue une seconde commande de démarrage lorsque la vitesse de rotation du moteur (6) est inférieure à la première vitesse de rotation au même instant. Lors de la première commande de démarrage, le micro-ordinateur (45) arrête le moteur (6) lorsque, après l'écoulement d'un second temps prescrit depuis le début d'entraînement du moteur, la vitesse de rotation du moteur est inférieure à une seconde vitesse de rotation. Lors de la seconde commande de démarrage, le micro-ordinateur (45) continue l'entraînement du moteur (6) même si la vitesse de rotation du moteur (6), après l'écoulement du second temps prescrit depuis le début d'entraînement du moteur (6), est inférieure à la seconde vitesse de rotation.
PCT/JP2020/003663 2019-02-26 2020-01-31 Engin de chantier électrique WO2020175007A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2021501796A JP7180746B2 (ja) 2019-02-26 2020-01-31 電動作業機
DE112020000307.8T DE112020000307T5 (de) 2019-02-26 2020-01-31 Elektrisch angetriebenes arbeitsgerät
CN202080009589.5A CN113316500B (zh) 2019-02-26 2020-01-31 电动作业机

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JP2019033368 2019-02-26

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CN (1) CN113316500B (fr)
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