JP2011255483A - Electric tool and power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tool and a power tool which prevent a rise in the temperature of a motor, reduce production cost, and decrease a size.SOLUTION: An electronic pulse driver 1 includes the motor 3, switching elements Q1 to Q6 for controlling the rotation of the motor 3, a thermistor 33B for detecting the temperature of the electronic pulse driver 1 and a light 2A for illuminating a front part to operate as an illumination. When the thermistor 33B detects a rise in the temperature, the light 2A flickers, which is not a natural function of the light 2A, to inform an operator of the rise in the temperature.

Description

  The present invention relates to an electric tool and a power tool.

  An impact driver as a conventional electric tool is held by an anvil, a motor, a control board that controls driving of the motor, a hammer that is driven by the motor and rotates in a certain direction, an anvil that is struck in a certain direction by the hammer, and A tip tool (see, for example, Patent Document 1). The hammer rotates integrally with the anvil when the anvil is not over a predetermined load, and strikes the anvil when the load on the anvil exceeds the predetermined load. When the hammer rotates with the anvil (or strikes the anvil), the rotational force (striking force) is transmitted to the tip tool.

JP 2008-307664 A

  In conventional power tools, when the impact driver is used continuously, the temperature of the motor etc. rises, and as a result of continued use without the operator noticing the temperature rise of the motor etc., the elements on the motor and control board are damaged. There was a problem.

  However, if a means for notifying the worker of the temperature rise is newly provided, the number of parts increases, the manufacturing cost increases, and the size of the impact driver increases. Therefore, an object of the present invention is to provide an electric tool and a power tool that prevent a temperature rise of a motor or the like, reduce the manufacturing cost, and reduce the size.

  To achieve the above object, the present invention provides a motor, a switching element, a first means for performing a first operation, a temperature abnormality detecting means for detecting a temperature abnormality of at least one of the motor and the switching element, Control means for controlling the first means to stop the first action when the temperature abnormality is detected by the temperature detection means in a state where the first means is performing the first action; The electric tool characterized by having provided.

  According to such a configuration, since the temperature abnormality is notified by stopping the operation of the first means provided originally, it is not necessary to provide a new notification means, and cost and space can be saved.

  In another aspect of the present invention, a motor, a switching element, a first means for performing a first operation, a temperature abnormality detection means for detecting a temperature abnormality of at least one of the motor and the switching element, and the first Control means for controlling the first means to perform the first operation when the temperature abnormality is detected by the temperature detection means in a state where the first means does not need to perform the first operation; An electric tool characterized by comprising the above is provided.

  According to such a configuration, since the temperature abnormality is notified by operating the originally provided first means, it is not necessary to provide a new notification means, and cost and space can be saved.

  According to another aspect of the present invention, there is provided a power tool having a motor as a driving source, a tip tool driven by the motor, and a light emitter capable of irradiating the tip tool, and the temperature of the motor There is provided a power tool characterized in that the luminous body blinks when the temperature of the lamp becomes high.

  According to such a configuration, it is possible to notify the operator that the motor has become hot by blinking the light emitter, so that the operator can recognize that the motor has become hot.

  According to another aspect of the present invention, a brushless motor having a stator having a coil, a rotor having a permanent magnet rotatable inside the stator, and a rotation detecting element capable of detecting the rotation of the permanent magnet, An electric tool having a circuit board to which the rotation detection element is fixed and the coil is connected, wherein the electric power tool is provided with a temperature detection element on the circuit board. .

  According to such a configuration, the temperature of the rotation detecting element can be accurately detected by providing the temperature detecting element on the circuit board.

  According to another aspect of the present invention, a brushless motor having a stator having a coil, a rotor having a permanent magnet rotatable inside the stator, a switching element for energizing the coil, and the switching element An electric tool having a circuit board to which is fixed, wherein a temperature detecting element is provided on the circuit board.

  According to such a configuration, by providing the temperature detection element on the circuit board, it is possible to accurately detect the temperature of the switching element that is a member whose temperature is likely to rise due to the use of the electric power tool.

  According to another aspect of the present invention, there is provided a power tool having a motor as a driving source, a tip tool driven by the motor, and a light emitter capable of irradiating the tip tool, and the temperature of the motor Becomes the first driving state, and when the temperature of the motor reaches a second temperature higher than the first temperature, the light emitting body becomes the second driving state. A power tool is provided.

  According to such a configuration, since the driving state of the light emitter is changed from the first driving state to the second driving state, the operator can recognize that the temperature of the motor has further increased. .

  According to another aspect of the present invention, there is provided a power tool having a motor as a driving source, a tip tool driven by the motor, and a light emitter capable of irradiating the tip tool, and the temperature of the motor Becomes the first driving state, and when the temperature of the motor reaches a third temperature lower than the first temperature, the light emitting body becomes the third driving state. A power tool is provided.

  According to such a configuration, the operator can recognize that the temperature of the motor has decreased because the driving state of the light emitter has changed from the first driving state to the third driving state.

  In another aspect of the present invention, a motor, a tip tool driven by the motor, a light emitter capable of irradiating the tip tool, and an operation unit for turning on / off the light emitter are provided. A power tool in which the light emitter is turned on after blinking the light emitter when the temperature of the motor reaches a predetermined temperature with the light emitter turned on, and the light emitter is turned off. Thus, there is provided a power tool configured to turn off the light emitter after blinking the light emitter when the temperature of the motor reaches a predetermined temperature.

  According to the present invention, it is possible to provide a power tool and a power tool that prevent a temperature rise of a motor or the like, reduce the manufacturing cost, and reduce the size.

Sectional drawing of the electronic pulse driver which concerns on the 1st Embodiment of this invention 1 is a cross-sectional view of the electronic pulse driver according to the first embodiment of the present invention taken along II-II in FIG. 1 and showing only a control board. FIG. 2 is an assembly diagram showing the periphery of the gear mechanism of the electronic pulse driver according to the first embodiment of the present invention. 1 is a control block diagram of an electronic pulse driver according to the first embodiment of the present invention. The figure explaining the control in the drill mode of the electronic pulse driver which concerns on the 1st Embodiment of this invention The figure explaining the control in the clutch mode of the electronic pulse driver which concerns on the 1st Embodiment of this invention The figure explaining the control in the pulse mode of the electronic pulse driver which concerns on the 1st Embodiment of this invention The flowchart which shows the control at the time of the temperature rise of the electronic pulse driver which concerns on the 1st Embodiment of this invention. The flowchart which shows the control at the time of the temperature rise of the electronic pulse driver which concerns on the 2nd Embodiment of this invention. The flowchart which shows the control at the time of the temperature rise of the electronic pulse driver which concerns on the 3rd Embodiment of this invention.

  Hereinafter, the structure of the electronic pulse driver 1 which is an example of the electric tool and power tool which concern on the 1st Embodiment of this invention is demonstrated based on FIGS. 1-8. In the present invention, the types of the electric tool and the power tool are not particularly specified, but in the present embodiment, description will be made using an electronic pulse driver that outputs rotational power.

  As shown in FIG. 1, the electronic pulse driver 1 includes a housing 2, a motor 3, a hammer portion 4, an anvil portion 5, an inverter circuit 6 (see FIG. 4) mounted on a substrate 33, and a substrate 26. It is mainly comprised from the control part 7 (refer FIG. 4) mounted. The housing 2 is made of resin and forms an outer shell of the electronic pulse driver 1, and is mainly composed of a substantially cylindrical body portion 21 and a handle portion 22 extending from the body portion 21.

  In the body portion 21, the motor 3 is arranged so that the longitudinal direction thereof coincides with the axial direction of the motor 3, and the hammer portion 4 and the anvil portion 5 are arranged side by side toward one end side in the axial direction of the motor 3. Has been. In the following description, the anvil portion 5 side is defined as the front side, the motor 3 side is defined as the rear side, and a direction parallel to the axial direction of the motor 3 is defined as the front-rear direction. Further, the body part 21 side is defined as the upper side, the handle part 22 side is defined as the lower side, and the direction in which the handle part 22 extends from the body part 21 is defined as the vertical direction. Further, a direction orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction.

  A metal hammer case 23 in which the hammer part 4 and the anvil part 5 are incorporated is arranged at a front side position in the body part 21. The hammer case 23 has a substantially funnel shape in which the diameter gradually decreases toward the front, an opening 23a is formed at the front end portion, and a metal 23A is provided on the inner wall that defines the opening 23a. .

  A light 2 </ b> A for irradiating a bit mounted on a tip tool mounting portion 51, which will be described later, is disposed near the opening 23 a and below the hammer case 23. The light 2A is provided to illuminate the front of the work when working in a dark place, and is normally turned on when the switch 2D is turned on and turned off when the switch 2D is turned off. Further, as will be described later, the light 2A in the present embodiment has a function of blinking in addition to the function as the illumination of the original light 2A. The light 2A is an example of the first means of the present invention.

  A forward / reverse switching lever 2B for switching the rotation direction of the motor 3 is disposed below the light 2A. The light 2 </ b> A and the forward / reverse switching lever 2 </ b> B are respectively disposed at approximately the center position of the body portion 21 in the left-right direction. The body portion 21 is formed with an inlet and an exhaust port (not shown) through which outside air is sucked and discharged into the body portion 21 by a fan 32 described later.

  The handle portion 22 extends downward from a substantially central position in the front-rear direction of the body portion 21 and is configured integrally with the body portion 21. Inside the handle portion 22, a switch mechanism 22A is incorporated, and a battery 24 for supplying power to the motor 3 and the like is detachably mounted at the lower end position thereof. A trigger 25 is provided above the handle portion 22 and at the front side position. The handle portion 22 is provided with a dial 2C that switches between a drill mode, a clutch mode, and a pulse mode, which will be described later. A substrate 26 is disposed near the battery 24 in the handle portion 22, and the control unit 7 is mounted on the substrate 26.

  As shown in FIG. 1, the motor 3 is a brushless motor mainly composed of a rotor 3 </ b> A having an output shaft 31 and a stator 3 </ b> B disposed to face the rotor 3 </ b> A, and the axial direction of the output shaft 31 is the front-rear direction. Is arranged in the body part 21 so as to coincide with the above. The rotor 3A has a plurality of sets (two sets in the present embodiment) of permanent magnets 3C including N poles and S poles, and the stator 3B includes star-connected three-phase stator windings U, V, and W. (FIG. 4). The output shaft 31 protrudes forward and backward of the rotor 3A, and is rotatably supported on the body portion 21 by a bearing at the protruding portion. A fan 32 that rotates coaxially with the output shaft 31 is provided at a location protruding to the front side of the output shaft 31, and a pinion gear 31A rotates coaxially with the output shaft 31 at the foremost position of the location. It is provided to do.

  A control board 33 is disposed behind the motor 3. As shown in FIG. 2, a through hole 33a is formed at the center of the control board 33, and the output shaft 31 penetrates the through hole 33a. Three rotational position detection elements (Hall elements) 33A and a thermistor 33B are provided on the front surface of the control board 33 so as to protrude forward. The rear surface of the control board 33 is indicated by a dotted line in FIG. Six switching elements Q1 to Q6 constituting the inverter circuit 6 are provided at the positions shown. The rotational position detection element 33A is for detecting the position of the rotor 3A, and is provided at a position facing the permanent magnet 3C of the rotor 3A, and at a predetermined interval (for example, an angle) in the circumferential direction of the rotor 3A. (Every 60 °). The thermistor 33B is for detecting the ambient temperature. As shown in FIG. 2, the thermistor 33B is arranged at equal intervals from the left and right switching elements. When viewed from the rear, the thermistor 33B The stator windings U, V, and W are arranged so as to overlap. The rotation detection element 33A, the switching elements Q1 to Q6, and the motor 3 are members that have the largest temperature rise and are easily damaged by the temperature rise. Therefore, the thermistor 33A, the switching elements Q1 to Q6, and the motor 3 By arranging 33B, it is possible to accurately detect the temperature rise of the rotation detecting element 33A, the switching elements Q1 to Q6, and the motor 3.

  The hammer part 4 is mainly composed of a gear mechanism 41 and a hammer 42, and is built in the front side of the motor 3 in the hammer case 23. The gear mechanism 41 is a two-stage planetary gear mechanism, and includes outer gears 41A and 41B, three planetary gears 41C and 41D, and carriers 41E and 41F, respectively, as shown in FIG. The outer gears 41 </ b> A and 41 </ b> B are fixed in the hammer case 23.

  The first stage planetary gear mechanism will be described. The three planetary gears 41C are arranged around the pinion gear 31A as a sun gear so as to mesh with the pinion gear 31A, and are arranged inside the outer gear 41A so as to mesh with the outer gear 41A. The three planetary gears 41C are fixed to a carrier 41E having a sun gear. With such a configuration, as the pinion gear 31A rotates, the three planetary gears 41B revolve around the pinion gear 31A, and the rotation reduced by the revolution is transmitted to the sun gear of the carrier 41E. Similarly, in the second stage planetary gear mechanism, the rotation of the motor 3 is decelerated and transmitted to the hammer 42.

  The hammer 42 is disposed on the front side of the gear mechanism 41, and has a first engagement protrusion 42A and a second engagement protrusion 42B that are disposed opposite to the rotation shaft and project toward the front side.

  The anvil portion 5 is disposed in front of the hammer portion 4 and mainly includes a tip tool mounting portion 51 and an anvil 52. The tip tool mounting portion 51 is formed in a cylindrical shape and is rotatably supported in the opening 23a of the hammer case 23 via a metal 23A. A drill 51a into which a bit (not shown) is inserted is drilled in the front tool mounting portion 51 in the front-rear direction, and a chuck 51A for holding a bit (not shown) is provided at the front end portion.

  The anvil 52 is configured to be integrated with the tip tool mounting portion 51 in the hammer case 23 at the rear of the tip tool mounting portion 51, and disposed opposite to the rotation center of the tip tool mounting portion 51. It has the 1st to-be-engaged protrusion 52A and the 2nd to-be-engaged protrusion 52B which protruded toward. When the hammer 42 rotates, the first engagement protrusion 42A and the first engagement protrusion 52A collide with each other, and at the same time, the second engagement protrusion 42B and the second engagement protrusion 52B collide with each other. A rotational force is transmitted to the anvil 52.

  The inverter circuit 6 includes six switching elements Q1 to Q6 such as FETs connected in a three-phase bridge format (see FIG. 4).

  The control unit 7 is connected to the battery 24 and connected to the light 2A, the forward / reverse switching lever 2B, the dial 2C, the trigger 25, and the thermistor 33B. The control unit 7 also includes a current detection circuit 71, a switch operation detection circuit 72, an applied voltage setting circuit 73, a rotation direction setting circuit 74, a rotor position detection circuit 75, a rotation speed detection circuit 76, and an impact. An impact detection circuit 77, a calculation unit 78, and a control signal output circuit 79 are provided (see FIG. 4).

  Next, the configuration of the drive control system of the motor 3 will be described with reference to FIG. In the present embodiment, the motor 3 is a three-phase brushless DC motor. The gates of the switching elements Q1 to Q6 of the inverter circuit 6 are connected to the control signal output circuit 79 of the control unit 7, and the drains or sources of the switching elements Q1 to Q6 are the stator windings U, V, Connected to W. The six switching elements Q <b> 1 to Q <b> 6 perform a switching operation by a switching element drive signal input from the control signal output circuit 79, and the DC voltage of the battery 24 applied to the inverter circuit 6 is three-phase (U phase, V phase). And W phase) Electric power is supplied to the stator windings U, V, W as voltages Vu, Vv, Vw. Specifically, the stator windings U, V, and W that are energized by the output switching signals H1, H2, and H3 input from the control signal output circuit 79 to the positive power supply side switching elements Q1, Q2, and Q3, that is, the rotor The direction of rotation of 3A is controlled. Further, power is supplied to the stator windings U, V, and W by pulse width modulation signals (PWM signals) H4, H5, and H6 that are input from the control signal output circuit 79 to the negative power supply side switching elements Q4, Q5, and Q6. The amount, that is, the rotational speed of the rotor 3A is controlled.

  The current detection circuit 71 detects the current value supplied to the motor 3 and outputs it to the calculation unit 78. The switch operation detection circuit 72 detects the presence / absence of the operation of the trigger 25 and outputs it to the calculation unit 78. The applied voltage setting circuit 73 outputs a signal corresponding to the operation amount of the trigger 25 to the calculation unit 78.

  When the rotation direction setting circuit 74 detects the switching of the forward / reverse switching lever 2 </ b> B, the rotation direction setting circuit 74 transmits a signal for switching the rotation direction of the motor 3 to the calculation unit 78.

  The rotor position detection circuit 75 detects the rotation position of the rotor 3A based on the signal from the rotation position detection element 33A and outputs the rotation position to the calculation unit 78. The rotation speed detection circuit 76 detects the rotation speed of the rotor 3 </ b> A based on the signal from the rotation position detection element 33 </ b> A and outputs it to the calculation unit 78.

  Further, the electronic pulse driver 1 is provided with a hitting impact detection sensor for detecting the magnitude of the impact generated in the anvil 52, and the hitting impact detection circuit 77 sends a signal from the hitting impact detection sensor to the calculation unit 78. Output.

  Although not shown, the calculation unit 78 is a central processing unit (CPU) for outputting a drive signal based on the processing program and data, a ROM for storing the processing program and control data, and temporary storage of data. RAM and a timer are provided. The calculation unit 78 outputs the output switching signals H1, H2, and H3 based on the signals from the rotation direction setting circuit 74 and the rotor position detection circuit 75, and the pulse width modulation signal (PWM signal) based on the signal from the applied voltage setting circuit 73. ) H4, H5, and H6 are generated and output to the control signal output circuit 79. The PWM signal may be output to the positive power supply side switching elements Q1 to Q3, and the output switching signal may be output to the negative power supply side switching elements Q4 to Q6.

  In addition, an ON / OFF signal from the switch 2D and a temperature signal from the thermistor 33B are input to the calculation unit 78, and based on these, the lighting, blinking, and extinguishing of the light 2A are controlled, so that the inside of the housing 2 is controlled. Announces temperature rise. The notification function when the temperature in the housing 2 rises will be described later.

  Next, operation modes that can be used in the electronic pulse driver 1 according to the present embodiment and control of the control unit 7 will be described with reference to FIGS. The electronic pulse driver according to the present embodiment has three operation modes of a drill mode, a clutch mode, and a pulse mode, and the mode can be switched by operating the dial 2C. In the following description, the starting current is not considered in the determination based on the current. In addition, a rapid increase in the current value when a forward current is applied is not considered. For example, the rapid increase in the current value when the forward rotation current as shown in FIGS. 5 to 7 is applied does not contribute to screw or bolt tightening. This sudden rise in the current value can be avoided by providing a dead time of about 20 ms, for example.

  The drill mode is a mode in which the hammer 42 and the anvil 52 are integrally rotated, and is mainly used when wood screws are fastened. As shown in FIG. 5, the current flowing through the motor 3 increases as the fastening proceeds.

  In the clutch mode, as shown in FIG. 6, the driving of the motor 3 is stopped when the current flowing through the motor 3 increases to the target value (target torque) while the hammer 42 and the anvil 52 are rotated together. This mode is mainly used in cases where importance is attached to fastening with an accurate torque, such as fastening fasteners that appear on the exterior after fastening.

  In the clutch mode, when the trigger 25 is pulled (t1 in FIG. 6), a pre-start is started. In the pre-start, the controller 7 applies a pre-start voltage (for example, 1.5 V) to the motor 3 for a predetermined time (t2 in FIG. 6) in order to bring the hammer 42 and the anvil 52 into contact with each other. When the trigger is pulled, the hammer 42 and the anvil 52 may be separated from each other, and when current flows through the motor 3 in this state, the hammer 42 strikes the anvil 52. Due to this impact, the hammer 42 and the anvil 52 may collide and reach a target value (target torque). In the present embodiment, the pre-start is performed to prevent the hammer 42 and the anvil 52 from colliding with each other, so that the current flowing through the motor 3 can be prevented from instantaneously reaching the target value (target torque).

  When the fastener is seated on the workpiece, the current value increases rapidly (t3 in FIG. 6). When this current value exceeds the threshold A, the control unit 7 stops the torque supply to the fastener. However, when the bolt is fastened, since the current increases rapidly, there is a possibility that torque is applied to the bolt by inertia force simply by stopping application of the forward rotation voltage. Accordingly, the brake reverse voltage is applied to the motor 3 in order to stop the supply of torque to the bolt.

  Subsequently, the forward rotation voltage and the reverse rotation voltage for the pseudo clutch are alternately applied to the motor 3 (t4 in FIG. 6). In the present embodiment, the pseudo-clutch forward rotation voltage and reverse rotation voltage application time are set to 1000 ms (1 second). The pseudo clutch has a function of notifying an operator that a desired torque has been reached by reaching a predetermined current value. Actually, the output from the motor is not lost, but it is notified that the output from the motor is virtually lost.

  When the pseudo-clutch reverse voltage is applied, the hammer 42 is separated from the anvil 52, and when the pseudo-clutch forward voltage is applied, the hammer 42 strikes the anvil 52. Since the voltage is set to a voltage that does not give the fastening force to the fastener (for example, 2 V), only a pseudo clutch is generated as a striking sound. Due to the occurrence of this pseudo clutch, the operator can recognize the end of the engagement. After the pseudo clutch is operated for the period t4, the motor 3 automatically stops (t5).

  In the pulse mode, as shown in FIG. 7, when the current flowing in the motor 3 increases to a predetermined value (predetermined torque) while the hammer 42 and the anvil 52 are integrally rotated, This is a mode in which reverse rotation is alternately switched and a fastener is fastened by striking, and is mainly used for fastening a long screw used in a place that does not appear on the appearance. Thereby, a strong fastening force can be supplied, and at the same time, a repulsive force from the workpiece can be reduced.

  In the pulse mode, since it is not important to fasten with accurate torque, the operation corresponding to the pre-start in the clutch mode is omitted. The motor 3 starts operating by pulling the trigger 25 (t1 in FIG. 7), and when the current value of the motor 3 exceeds the threshold B (t2), the control unit 7 applies a pulse mode voltage to the motor 3. . Specifically, the control unit 7 alternately applies a constant forward voltage and a constant reverse voltage to the motor 3. Thereby, since the hammer 42 strikes the anvil 52, a stronger fastening force can be supplied. Thereafter, the operation of the motor 3 is stopped by turning off the trigger 25.

  Next, a notification function when the temperature in the housing 2 rises by the electronic pulse driver 1 according to the first embodiment will be described.

  FIG. 8 is a flowchart for explaining control when the temperature of the motor 3 of the electronic pulse driver 1 according to the first embodiment rises. By installing the battery 24, the flowchart of FIG. 8 starts. In addition, the flowchart of FIG. 8 illustrates a case where the process starts when the switch 2D is turned on and the light 2A is normally lit.

  First, the control unit 7 determines whether or not the trigger 25 is turned on (S1). When the trigger 25 is turned on (S1: YES), it is subsequently determined whether the temperature detected by the thermistor 33B is equal to or higher than the warning temperature of 120 ° C. (S2). When the detected temperature is lower than 120 ° C. (S2: NO), the process returns to S1, and it is determined again whether or not the trigger 25 is turned on. If the detected temperature is 120 ° C. or higher (S2: YES), it is determined whether the detected temperature is 140 ° C. or higher, which is a dangerous temperature (S3).

  If the detected temperature is 140 ° C. or higher (S3: YES), it is determined that there is a possibility that the switching elements Q1 to Q6, the motor 3 and the elements on the control board 33 may be damaged if the temperature rises further. Is forcibly stopped (S4).

  Thereafter, it is determined whether or not the detected temperature has dropped below 85 ° C., which is the forced stop release temperature (S5). When the detected temperature drops below 85 ° C. (S5: YES), after canceling the forced stop of the power supply to the motor 3 (S6), the process returns to S1 and whether or not the trigger 25 is turned on again. Make a decision.

  When the detected temperature is lower than 140 ° C. in S3 (S3: NO), it is determined whether or not the trigger 25 is turned off (S7). When the trigger 25 is not turned off (S7: NO), the process returns to S3, and it is determined again whether or not the detected temperature is 140 ° C. or higher. On the other hand, when the trigger 25 is turned off (S7: YES), the light 2A is blinked (S8) to notify the operator that the temperature of the motor 3 or the switching elements Q1 to Q6 is rising. In the present embodiment, the warning temperature of 120 ° C. corresponds to the abnormal temperature described in claims 1 and 2 of the present invention. Further, when considering in claim 1, lighting of the light 2A corresponds to the first operation, and blinking of the light 2A corresponds to stop of the first operation, and considering in claim 2, blinking of the light 2A corresponds to the first operation. Equivalent to.

  Thereafter, it is determined whether or not the detected temperature has dropped below 60 ° C., which is the normal operation return temperature (S9). When the detected temperature falls below 60 ° C. (S9: YES), it is determined whether or not the switch 2D is turned on (S10). When the switch 2D is turned on (S10: YES), after the flashing light 2A is returned to the normal lighting (S11), the process returns to S1 to determine again whether or not the trigger 25 is turned on. Do. On the other hand, when the switch 2D is turned off (S10: NO), after the blinking light 2A is turned off (S12), the process returns to S1 to determine again whether or not the trigger 25 is turned on. Do.

  As described above, in the electronic pulse driver 1 according to the first embodiment, the temperature detected by the thermistor 33B is not less than the warning temperature (120 ° C. in the first embodiment) and the dangerous temperature (140 ° C. in the first embodiment). If the trigger 25 is turned off in a state less than), the light 2A is blinked to notify the operator of the temperature rise. Since the light 2A is originally provided in the electronic pulse driver 1, it is not necessary to newly provide a notification means, and cost and space can be saved.

  Next, an electronic pulse driver 201 which is an example of an electric tool and a power tool according to a second embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, the flowchart of FIG. 8 starts with the switch 2D turned on and the light 2A normally lit. In this embodiment, the switch 2D is turned off and the light 2A is turned off. A case where the vehicle is started in a running state will be described.

  First, the control unit 7 determines whether or not the trigger 25 is turned on (S11). When the trigger 25 is turned on (S11: YES), it is subsequently determined whether the temperature detected by the thermistor 33B is equal to or higher than the caution temperature of 85 ° C. (S12). If the detected temperature is 85 ° C. or higher (S12: YES), after the light 2A is blinked (S13), it is determined whether the detected temperature is 120 ° C. or higher, which is the warning temperature (S14).

  If the detected temperature is 120 ° C. or higher (S14: YES), the light 2A is turned on (S15), and it is determined whether the detected temperature is 140 ° C. or higher, which is a dangerous temperature (S16). If the detected temperature is 140 ° C. or higher (S16: YES), it is determined that there is a possibility that the switching elements Q1 to Q6, the motor 3 and the elements on the control board 33 may be damaged if the temperature rises further. After the power supply is forcibly stopped (S17), the light 2A is turned off (S18), and the process ends. In the case of NO in S11, S12, S14, and S16, all return to S11 to determine whether or not the trigger 25 is turned on again. In the present embodiment, the caution temperature of 85 ° C. and the warning temperature of 120 ° C. correspond to the abnormal temperature of the present invention, and the blinking and lighting of the light 2A is the first operation according to claim 2 of the present invention. Equivalent to.

  Next, an electronic pulse driver 301 which is an example of an electric tool and a power tool according to a third embodiment of the present invention will be described with reference to FIG.

  In the first and second embodiments, the flowchart of FIG. 8 reports the temperature rise by turning on and blinking the light 2A, but in this embodiment, the temperature rise is reported by changing the illuminance of the light 2A. To do. In the flowchart of FIG. 10, a case will be described in which the start is performed in a state where the switch 2D is turned on and the light 2A is normally lit.

  First, the control unit 7 determines whether or not the trigger 25 is turned on (S21). When the trigger 25 is turned on (S21: YES), the illuminance of the light 2A is set to 100% (S22), and it is determined whether or not the temperature detected by the thermistor 33B is equal to or higher than the caution temperature of 85 ° C. (S23). If the detected temperature is 85 ° C. or higher (S23: YES), the illuminance of the light 2A is changed to 75% (S24), and it is determined whether the detected temperature is 120 ° C. or higher, which is the warning temperature (S25). ).

  When the detected temperature is 120 ° C. or higher (S25: YES), the illuminance of the light 2A is changed to 50% (S26), and it is determined whether the detected temperature is 140 ° C. or higher, which is a dangerous temperature (S27). ). If the detected temperature is 140 ° C. or higher (S27: YES), it is determined that there is a possibility that the switching elements Q1 to Q6, the motor 3 and the elements on the control board 33 may be damaged if the temperature rises further. Is forcibly stopped (S28), the illuminance of the light 2A is changed to 0% (S29), and the process ends. In the case of NO in S21, S23, S25, and S27, all return to S21 and determine whether or not the trigger 25 is turned on again. In the present embodiment, a warning temperature of 85 ° C., a warning temperature of 120 ° C., and a dangerous temperature of 140 ° C. correspond to the abnormal temperature of the present invention, and the illuminance of the light 2A is 100%. 1 corresponds to the first operation, and the illuminance of 75%, 50%, and 0% of the light 2A corresponds to the stop of the first operation according to claim 1 of the present invention.

  The electronic pulse driver of the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims.

  In the above embodiment, the light 2A is used as the first means of the present invention, and the temperature rise is notified by the blinking of the light 2A as the first operation. However, the present invention is not limited to this. You may notify by other means. For example, the first operation may be notified by a pseudo clutch used in the clutch mode.

  In the first to third embodiments, the light 2A is turned on when the switch 2D is turned on. However, the light 2A may be turned on when the trigger 25 is turned on. In this case, after the trigger 25 is turned off in S7 of FIG. 8, when the detected temperature falls to 60 ° C. or lower (S9: YES), the light 2A is turned off without returning to normal lighting.

  In the above embodiment, 85 ° C., 120 ° C., 140 ° C., 85 ° C., and 60 ° C. are used as the caution temperature, warning temperature, danger temperature, forced stop release temperature, and normal operation return temperature, respectively. May be used.

  Further, the forced cooling mode may be shifted to after the power supply to the motor 3 is forcibly stopped in S4 of the flowchart of FIG. In the forced cooling mode, for example, control is performed so that the operation of the trigger 25 by the user is enabled only when the load of the motor 3 is small. Since the temperature of the motor 3 does not rise when the load is low, when the operator pulls the trigger 25, the fan 32 rotates and the inside of the housing 2 can be actively cooled.

1..Electronic pulse driver 2A..Light 3..Motor 33..Control board 33A..Rotation position detecting element 33B..Thermistor 7..Control units Q1 to Q6..Switching element

Claims (8)

A motor,
A switching element;
First means for performing a first action;
A temperature abnormality detecting means for detecting a temperature abnormality of at least one of the motor and the switching element;
Control means for controlling the first means to stop the first action when the temperature abnormality is detected by the temperature detection means while the first means is performing the first action; ,
An electric tool comprising: A motor,
A switching element;
First means for performing a first action;
A temperature abnormality detecting means for detecting a temperature abnormality of at least one of the motor and the switching element;
Control means for controlling the first means to perform the first operation when the temperature abnormality is detected by the temperature detection means in a state where the first means does not need to perform the first operation;
An electric tool comprising: A motor as a drive source;
A tip tool driven by the motor;
A light emitter capable of irradiating the tip tool;
A power tool having
A power tool characterized in that the light emitter flashes when the temperature of the motor becomes high. A brushless motor having a stator having a coil and a rotor having a permanent magnet rotatable inside the stator;
A rotation detecting element capable of detecting rotation of the permanent magnet;
A circuit board to which the rotation detection element is fixed and the coil is connected;
An electric tool having
A power tool, wherein a temperature detection element is provided on the circuit board. A brushless motor having a stator having a coil and a rotor having a permanent magnet rotatable inside the stator;
A switching element for energizing the coil;
A circuit board to which the switching element is fixed;
An electric tool having
A power tool, wherein a temperature detection element is provided on the circuit board. A motor as a drive source;
A tip tool driven by the motor;
A light emitter capable of irradiating the tip tool;
A power tool having
When the temperature of the motor reaches a first temperature, the light emitter is in a first driving state,
When the temperature of the motor reaches a second temperature higher than the first temperature, the light emitter enters a second driving state. A motor as a drive source;
A tip tool driven by the motor;
A light emitter capable of irradiating the tip tool;
A power tool having
When the temperature of the motor reaches a first temperature, the light emitter is in a first driving state,
When the temperature of the motor reaches a third temperature lower than the first temperature, the light emitter enters a third driving state. A motor,
A tip tool driven by the motor;
A light emitter capable of irradiating the tip tool;
An operation unit for turning on and off the light emitter;
A power tool having
When the temperature of the motor reaches a predetermined temperature with the light emitter turned on, the light emitter is turned on after blinking the light emitter, and the temperature of the motor is changed with the light emitter turned off. A power tool configured to turn off the light-emitting body after blinking the light-emitting body when the temperature reaches a predetermined temperature.

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