JPWO2018163643A1 - Portable power tool - Google Patents

Abstract

A portable power tool with good weight balance is provided with a configuration in which a reactor is provided in the current path of a motor. The portable cutting machine 1 converts alternating current into direct current, with a motor 6, a motor housing 11 accommodating the motor 6, a saw blade 16 rotated by the motor 6, and a handle housing 12 connected to the motor housing 11. It has a rectifier circuit to be supplied to the motor 6, an electric field capacitor C2, C3 for smoothing the output current of the rectifier circuit, and a reactor L2 provided in the current path of the motor 6. The motor 6 and the saw blade 16 are positioned opposite to each other across a virtual plane P which passes through the central axis of the handle portion 12 b and is parallel to the working direction of the portable cutting machine 1. The reactor L2 is located on the opposite side of the saw blade 16 with respect to the virtual plane P.

Description

The present invention relates to an AC drive portable power tool driven by a brushless motor.

In recent years, there has been a demand for an electric power tool that can be miniaturized by adopting a brushless motor. An AC drive power tool driven by a brushless motor includes a rectifier circuit such as a diode bridge, an inverter circuit for supplying a drive current to the motor, and a smoothing capacitor for smoothing the output current of the rectifier circuit. In the case of power tools with high output such as grinders and circular saws, it is necessary to increase the capacity of the smoothing capacitor in order to allow a large ripple current.

JP, 2013-193133, A

Although it is preferable to reduce the harmonics in the AC-driven power tool, increasing the capacity of the smoothing capacitor causes a problem that the power factor deteriorates and the harmonics increase. As a measure against this problem, it is conceivable to provide a reactor (coil) in the current path of the motor. The reactor for preventing harmonics is large in size and weight in order to allow a large motor current, and therefore has a large influence on the weight balance of the product.

The present invention has been made in recognition of such a situation, and an object thereof is to provide a portable power tool with good weight balance in a configuration in which a reactor is provided in a current path of a motor.

One aspect of the present invention is a portable power tool. The portable power tool includes a brushless motor, a housing for housing the brushless motor, a rotating tool rotated by the brushless motor, a handle connected to the housing, and an alternating current to direct current to convert the brushless motor. And a reactor provided in a current path of the brushless motor, wherein the brushless motor and the rotating tool have a central axis of the handle. The reactors are positioned opposite to each other across a virtual plane parallel to the working direction of the electric power tool, and the reactor is accommodated in the housing on the opposite side of the rotating tool with respect to the virtual plane.

The reduction mechanism may be provided to decelerate the rotation of the brushless motor and transmit the rotation to the rotating tool, and the reduction mechanism may be provided on the opposite side of the reactor with respect to the virtual plane.

A power supply cord having a drive circuit for supplying a drive current to the brushless motor and a controller for controlling the drive circuit, wherein a power supply cord connectable to an AC power supply extends from the vicinity of one end of the handle; The capacitor and the reactor may be provided on the same side of the imaginary plane as the brushless motor and around the brushless motor.

The capacitor and the reactor are located on the opposite side of the extension source of the power cord across the brushless motor in the work direction, and the controller is located on the extension source side of the brushless motor in the work direction You may

The capacitor and the reactor may be located outside the presence range of the handle in the work direction, and the controller may be located or extend in the presence range of the handle in the work direction.

The switch may be provided in the current path of the brushless motor to switch between conduction and interruption of the current path, the switch may be provided in the handle, and the reactor may be disposed ahead of the switch. .

The capacitor is located on the opposite side of the extension source of the power supply cord across the brushless motor in the working direction, and the controller and the reactor are located on the extension source side of the brushless motor in the working direction You may

The capacitor may be located outside the presence range of the handle in the work direction, and the controller and the reactor may be located or extend in the presence range of the handle in the work direction.

The switch may be provided in the current path of the brushless motor to switch between conduction and interruption of the current path, the switch may be provided in the handle, and the reactor may be disposed rearward of the switch. .

It is to be noted that arbitrary combinations of the above-described components, and those obtained by converting the expression of the present invention among methods, systems, and the like are also effective as aspects of the present invention.

According to the present invention, it is possible to provide a portable power tool with good weight balance in a configuration in which a reactor is provided in the current path of the motor.

The side view of the portable cutting machine 1 which concerns on Embodiment 1 of this invention. The top view of the portable cutting machine 1. FIG. FIG. 2 is a plan sectional view of the portable cutting machine 1; The side sectional view of the main body 10 of the portable cutting machine 1 (AA sectional drawing of FIG. 3). The circuit block diagram of the portable cutting machine 1. FIG. The sectional side view of the main body 10 of the portable cutting machine which concerns on Embodiment 2 of this invention. The plane sectional view of the portable cutting machine which concerns on Embodiment 3 of this invention. FIG. 8 is a side sectional view of the main body 10 of FIG. 7; The plane sectional view of the portable cutting machine which concerns on Embodiment 4 of this invention. FIG. 10 is a side sectional view of the main body 10 of FIG. 9; The sectional side view of the portable cutting machine which concerns on Embodiment 5 of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component shown by each drawing, a member, etc., and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention, and are merely examples, and all the features described in the embodiments and the combination thereof are not necessarily essential to the invention.

First Embodiment The mechanical configuration of a portable cutting machine 1 as a portable power tool according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. Referring to FIGS. 1 to 3, the front, rear, upper and lower, right and left directions orthogonal to each other are defined. The front-rear direction is the working direction of the portable cutting machine 1. The vertical direction is a direction perpendicular to the base 30. The left and right direction is defined on the basis of the forward direction (cutting advancing direction). FIG. 3 shows a virtual plane P which passes through the central axis of the handle portion 12 b and is parallel to the cutting advancing direction of the portable cutting machine 1.

The portable cutting machine 1 is here a portable circular saw and comprises a body 10 and a base 30. The main body 10 is connected to and supported by the base 30 by a known tilt support mechanism 20 and a swing support mechanism 25. The main body 10 is tiltable in at least one of left and right with respect to the base 30 by the support of the tilt support mechanism 20. Further, the main body 10 can be rocked in the vertical direction with respect to the base 30 by the support of the rocking support mechanism (cutting depth adjusting mechanism) 25. The base 30 is, for example, a substantially rectangular plate made of metal such as aluminum. The longitudinal direction of the base 30 coincides with the working direction of the portable cutting machine 1. The bottom surface of the base 30 is a sliding surface with the work material. The housing (outer shell) of the main body 10 is composed of a motor housing 11, a handle housing 12, a gear cover 13, a capacitor accommodating portion 17, a reactor accommodating portion 18, and a control circuit accommodating portion 19 which are integrated with each other. Ru.

The motor housing 11 is, for example, a resin molded body, and accommodates the motor 6 shown in FIGS. 3 and 4 therein. The motor 6 is an inner rotor type brushless motor, and a rotor core 6b made of a magnetic material that rotates integrally with the output shaft 6a is provided around the output shaft 6a. A plurality of (for example, four) rotor magnets (permanent magnets) 6c are inserted and held in the rotor core 6b. A stator core 6d is provided around the rotor core 6b (fixed to the motor housing 11). The stator core 6d is provided with a stator coil 6e (FIG. 5).

The handle housing 12 is, for example, a resin molding of a left and right split structure, and is connected to the motor housing 11. The handle housing 12 is connected to the motor housing 11 and the gear cover 13 and connects the base 12a that houses the control board 41, the handle 12b that is a grip, and the front end of the handle 12b to the base 12a. And a connecting portion 12c. The rear end of the base 12a and the rear end of the handle 12b are connected to each other. The handle portion 12 b is provided with a trigger portion (operation portion) 5 for the user to switch between driving and stopping of the motor. A contact switch 5a shown in FIG. 5 which is switched on / off by the trigger unit 5 is provided in the handle 12b. The power supply cord 7 connected to the AC power supply 51 of FIG. 5 extends from near the rear end of the handle housing 12.

The gear cover 13 is made of metal such as aluminum, for example, and is connected to the handle housing 12. The gear cover 13 covers the speed reduction mechanism 8 that decelerates the rotation of the motor 6 and transmits it to the saw blade 16 and covers the upper half of the saw blade 16. The reduction mechanism 8 is a two-stage reduction mechanism using three metal gears, and reduces the rotation of the output shaft 6 a in two steps and transmits it to the saw blade 16. Since the reduction mechanism 8 has many metal parts, the weight is particularly large among the elements constituting the portable cutting machine 1. The protective cover 15 is, for example, a resin molded body, and covers the lower half of the saw blade 16 so as to be openable and closable. The saw blade 16 as a tip tool (rotator) is a disk-shaped rotary blade, and is rotationally driven by the motor 6. The saw blade 16 protrudes downward from the lower surface of the base 30.

The capacitor housing portion 17 is, for example, a resin molded body, and is provided in front of the motor housing 11 adjacent to the motor housing 11. The capacitor accommodating portion 17 accommodates the smoothing electrolytic capacitors C2 and C3 therein. The reactor housing portion 18 is, for example, a resin molded body, and is provided adjacent to the capacitor housing portion 17 and above the capacitor housing portion 17. Reactor accommodating portion 18 accommodates therein reactor L2 for preventing harmonics. The control circuit housing portion 19 is, for example, a resin molded body, and is provided close to the rear of the motor housing 11. The control circuit accommodating portion 19 accommodates the control board 41 inside. The control board 41 is provided with a diode bridge 42, an inverter circuit 43, a control unit 50, a filter circuit 52, an IPD circuit 53, a regulator 54, and the like shown in FIG. 5 described later. The capacitor accommodating portion 17 and the reactor accommodating portion 18 may be formed separately from each other, or may be formed integrally. Further, the capacitor housing portion 17, the reactor housing portion 18 and the control circuit housing portion 19 may be a molded body integral with the left side portion of the handle housing 12. A power line 60 extending from the control circuit housing 19 and passing above the motor housing 11 is wired to the reactor housing 18, and the diode bridge 42 and the reactor L 2 are connected by the power line 60.

As shown in FIG. 3, on the left side of the virtual plane P, the motor 6, the motor housing 11, the electrolytic capacitors C2 and C3, and the reactor L2 are located. Electrolytic capacitors C 2 and C 3 and reactor L 2 are provided around motor 6. The control board 41 is located on the left side of the right end face of the handle housing 12 and most of the control board 41 is located on the left side of the virtual plane P. The gear cover 13, the saw blade 16, and the speed reduction mechanism 8 are located on the right side of the virtual plane P. The electrolytic capacitors C2 and C3 and the reactor L2 are located on the front side of the motor 6, that is, on the opposite side of the extension source of the power cord 7 with the motor 6 interposed in the front-rear direction. The control board 41 is located on the extension source side of the power cord 7 with respect to the motor 6 in the rear of the motor 6, that is, in the front-rear direction. Electrolytic capacitors C2 and C3 and reactor L2 are located outside the existing range of handle portion 12b (in front of the existing range) in the front-rear direction. The control board 41 is located or extends in the existing range of the handle portion 12 b in the front-rear direction.

FIG. 5 is a circuit block diagram of the portable cutting machine 1. A diode bridge 42 as a rectifier circuit for converting alternating current into direct current is connected to the alternating current power supply 51 via a filter circuit 52 for noise reduction. The filter circuit 52 includes a fuse Fin, a varistor Z1, a pattern fuse F1, a capacitor C1, a resistor R1, and a choke coil L1. The fuse Fin is for protection when the switching elements Q1 to Q6 are shorted. The varistor Z1 is for surge voltage absorption. The pattern fuse F1 has a role of preventing shorting between lines when the varistor Z1 works. The capacitor C1 and the choke coil L1 are for removing noise between the lines. The resistor R1 is a discharge resistor of the capacitor C1. The diode bridge 42 full-wave rectifies the output current (AC) from the filter circuit 52 into DC.

Electrolytic capacitors C 2 and C 3 are provided in parallel with the inverter circuit 43 between the output terminals of the diode bridge 42. A reactor L2 is provided in a current path (a current path of the motor 6) between the diode bridge 42 and the inverter circuit 43. One end of the reactor L2 is connected to one output terminal of the diode bridge 42. The other end of the reactor L2 is connected to one end of the electrolytic capacitors C2 and C3. The other ends of the electrolytic capacitors C 2 and C 3 are connected to the other output terminal of the diode bridge 42. An electrolytic capacitor C4 is provided between the output terminals of the diode bridge 42 in parallel with the electrolytic capacitors C2 and C3 and in parallel with the inverter circuit 43. The electrolytic capacitor C4 has a smaller capacity than the electrolytic capacitors C2 and C3.

A contact switch 5 a is provided in the current path between the diode bridge 42 and the inverter circuit 43. The electrolytic capacitors C2, C3 and the reactor L2 are provided on the diode bridge 42 side (input side) of the contact switch 5a. The electrolytic capacitor C4 is provided on the inverter circuit 43 side of the contact switch 5a. The contact switch 5 a is switched on / off by the operation of the trigger unit 5. The trigger unit 5 is an operation unit of a two-pole trigger switch. When the contact switch 5a is turned on by the operation of the trigger unit 5, the contact connected to the control unit 50 is simultaneously closed, and an on signal is input to the control unit 50.

The inverter circuit 43 as a drive circuit includes switching elements Q1 to Q6 such as IGBTs and FETs connected in a three-phase bridge manner, and performs switching operation according to the control of the control unit 50 to make stator coils 6e (U, V of the motor 6 Drive current is supplied to each winding of The resistor Rs is provided in the current path of the motor 6. The voltage across the resistor Rs is input to the control unit 50. The control unit 50 detects the current (load) of the motor 6 by the voltage across the resistor Rs. Further, the control unit 50 detects the rotational position (rotor rotational position) of the motor 6 based on the output voltage of the plurality of Hall ICs 45.

The anode of the diode D1 is connected to one output terminal of the diode bridge 42. The cathode of the diode D1 is connected to the first input terminal of the IPD circuit 53. The second output terminal of the IPD circuit 53 is connected to the other output terminal of the diode bridge 42. An electrolytic capacitor C5 is provided between the first and second input terminals of the IPD circuit 53. The IPD circuit 53 is a circuit configured by an IPD element, a capacitor, etc. which is an intelligent power device (Intelligent Power Device), and DC-DC switching which reduces the voltage between the output terminals of the diode bridge 42 to about 18 V, for example. It is a power supply circuit. The IPD circuit 53 is an integrated circuit and has an advantage of low power consumption and energy saving. The output voltage of the IPD circuit 53 is further stepped down to, for example, about 5 V by the regulator 54, and is supplied to the control unit 50 as an operating voltage (power supply voltage Vcc). The IPD circuit 53 and the regulator 54 constitute a control system power supply circuit that supplies an operating voltage to the control unit 50. The control unit 50 is, for example, a microcontroller (microcomputer). When the control unit 50 detects that the contact switch 5a is turned on by the operation of the trigger unit 5, the control unit 50 performs switching control (for example, PWM control) on the switching elements Q1 to Q6 to drive the motor 6.

According to the present embodiment, the following effects can be achieved.

The portable cutting machine 1 tends to be heavy on the saw blade 16 side (speed reduction mechanism 8 side) due to its structure, but the reactor L2 is disposed on the opposite side of the saw blade 16 with respect to the virtual plane P (center of the handle portion 12b) Therefore, the center of gravity can be brought closer to the central axis side of the handle portion 12b in the left-right direction. Thereby, compared with the case where there is no reactor L2, the weight balance of a product can be improved, suppressing a harmonic. Here, since the motor 6 is a brushless motor and is smaller in weight than a motor with a brush, the portable cutting machine 1 has a heavy saw blade 16 side compared to a portable cutting machine using a motor with a brush as a drive source However, by providing the reactor L2 having a large size and weight on the opposite side of the saw blade 16 with respect to the virtual plane P in order to allow a large motor current, the weight balance of the product can be effectively improved. Therefore, it is possible to suppress the deterioration of the operability caused by the gravity center position being closer to the saw blade 16 side.

Since the reactor L2 is provided in front of the handle portion 12b, the center of gravity of the portable cutting machine 1 is closer to the front than the center of the handle portion 12b compared to the case without the reactor L2, and the front end of the base 30 is cut Since it is easy to perform cutting start position alignment after placing on the upper surface of the material and it is possible to suppress flapping of the front part of the portable cutting machine 1 at the time of cutting operation, workability in particular in the case of high output is good.

Reactor L2 does not affect the grip of handle portion 12b, and there is no need to raise the position of handle portion 12b in order to provide reactor L2.

In the portable cutting machine 1, the power cord 7, the diode bridge 42 (the control board 41 on which it is mounted), the reactor L2, and the reactor L2 are arranged in this order from the back, so the circuit configuration shown in FIG. Since unnecessary wiring is unnecessary, the assembly can be facilitated and the cost can be reduced.

Since reactor accommodating portion 18 is located above capacitor accommodating portion 17, when connecting power line 60 from control board 41 to reactor L 2 through the upper side of motor housing 11, the wiring can be shortened.

Second Embodiment FIG. 6 is a side cross-sectional view of a main body 10 of a portable cutting machine according to a second embodiment of the present invention. In the portable cutting machine according to the present embodiment, the upper and lower relationship between the electrolytic capacitors C2 and C3 and the capacitor accommodating portion 17 and the reactor L2 and the reactor accommodating portion 18 is opposite to that in the first embodiment. Are different from each other and identical in other points. The present embodiment can also exhibit the effects (1) to (4) of the first embodiment. In addition, as a result of arranging reactor L2 below capacitor housing 17, power line 60 passing above motor housing 11 is slightly longer, but by arranging reactor L2 of a heavy object below, the center of gravity is made more It can be lowered to improve the working stability.

Third Embodiment FIG. 7 is a plan sectional view of a portable cutting machine according to a third embodiment of the present invention. 8 is a side sectional view of the main body 10 shown in FIG. Compared with the portable cutting machine according to the first embodiment, reactor cutting portion 18 according to the present embodiment has no reactor housing portion 18, and reactor L2 is housed together with control board 41 in control circuit housing portion 19 at the rear of motor 6 It differs in the point to be located, and agrees in other points. In the case of the third embodiment, reactor L2 is located above control board 41. Also in the present embodiment, as in the first embodiment, the position of the center of gravity can be made closer to the central axis side of the handle portion 12b in the left-right direction. Further, in the portable cutting machine according to the present embodiment, since the heavy objects such as the motor 6 and the speed reduction mechanism 8 are disposed forward of the center of the grip portion (slightly behind the trigger portion) of the handle portion 12b, the handle When the portable cutting machine 1 is lifted by gripping the portion 12b, the front end portion of the portable cutting machine tends to tilt downward, but in the present embodiment, the reactor L2 is behind the handle portion 12b in the front-rear direction Since the center of gravity of the portable cutting machine 1 is closer to the center of the handle 12b in the front-rear direction because it is provided near the end, the base 30 is held when the portable cutting machine 1 is held by gripping the handle 12b. Easy to level. By this, for example, the portable cutting machine 1 can be rotated 90 ° clockwise from the state of FIG. 1 to improve the stability at the time of an operation of cutting upward or at the time of transportation. The reactor L2 may be provided on the input side of the diode bridge 42 in order to achieve the effect of suppressing harmonics if the reactor L2 is connected to the input side of the electrolytic capacitors C2 and C3. In this case, in the case of the third embodiment, arranging the reactor L2 in the vicinity of the diode bridge 42 and the power supply cord 7 can shorten the wiring between the diode bridge 42 and the reactor L2, and the assemblability is good. The portable cutting machine 1 can be realized.

Fourth Embodiment FIG. 9 is a plan sectional view of a portable cutting machine according to a fourth embodiment of the present invention. FIG. 10 is a side sectional view of the main body 10 shown in FIG. FIG. 9 shows a virtual plane P passing the central axis of the handle portion 12 b and parallel to the working direction of the portable cutting machine 1. In the portable cutting machine according to the present embodiment, the reactor accommodating portion 18 is eliminated as compared with that of the first embodiment, and the reactor L2 is located in the vicinity of the connection portion between the base 12a of the handle housing 12 and the handle portion 12b. That is, the virtual plane P in the vicinity of the extension source of the power supply cord 7 is disposed at a crossing position. Reactor L 2 is located between contact switch 5 a and the extension source of power supply cord 7. The motor 6, the motor housing 11, and the electrolytic capacitors C2 and C3 are located on the left side of the virtual plane P. The electrolytic capacitors C 2, C 3 and the control board 41 are provided around the motor 6. The control board 41 is located on the left side of the right end face of the handle housing 12 and most of the control board 41 is located on the left side of the virtual plane P. The gear cover 13, the saw blade 16, and the speed reduction mechanism 8 are located on the right side of the virtual plane P. The center of gravity of the portable cutting machine of the present embodiment is preferably located on a virtual plane P.

According to the present embodiment, reactor L2 is disposed at a position where virtual plane P crosses, in other words, on a plane parallel to the working direction and passing through the handle shaft (in the present case, a plane extending vertically and backwardly) Because the center of gravity of the portable cutting machine 1 deviates from the central axis of the handle portion 12b in the absence of the reactor L2, the reactor L2 is provided, so that the center of gravity position is the handle portion When the center-of-gravity position coincides with the center axis of the handle portion 12b in the absence of the reactor L2, the deviation of the center-of-gravity position due to the provision of the reactor L2 can be suppressed. Even when the reactor L2 is provided, the center of gravity position can be maintained in the same state as the central axis of the handle portion 12b). Therefore, the weight balance of the portable cutting machine 1 can be improved, and the deterioration of operability due to the provision of the reactor L2 can be suppressed. In addition, since reactor L2 is provided in the vicinity of the rear end of handle 12b, the center of gravity of portable cutting machine 1 is closer to the center of handle 12b in the front-rear direction, and grip handle 12b to cut it for portable use. When holding the machine 1, it is easy to level the base 30.

Fifth Embodiment FIG. 11 is a side sectional view of a main body 10 of a portable cutting machine according to a fifth embodiment of the present invention. The portable cutting machine according to the present embodiment is different from that of Embodiment 4 in that the position in the front-rear direction of reactor L2 is changed, specifically, reactor L2 is connected to handle portion 12b of handle housing 12 It differs in that it is provided in the inside or coupling part 12c near the interconnection part of 12c, and it agrees in other points. The present embodiment can also achieve the same effect as that of the first embodiment with respect to the center-of-gravity position in the left-right direction. Further, in the present embodiment, since reactor L2 is provided at the front end of handle housing 12, the center of gravity of portable cutting machine 1 is closer to the front compared to the case without reactor L2, and the front end of base 30 is It is easy to perform alignment at the start of cutting after placing on the upper surface of the work material, and the workability in the case of high output is good.

Although the present invention has been described above by taking the embodiment as an example, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. It is a place. The following describes the modification.

The number of electrolytic capacitors for smoothing is not limited to two, and may be one or three or more. Electrolytic capacitors C2 and C3 and reactor L2 may be provided on the inverter circuit 43 side (output side) of contact switch 5a.

DESCRIPTION OF SYMBOLS 1 ... Portable cutting machine (electric tool), 5 ... Trigger part, 7: Power cord, 8 ... Deceleration mechanism, 10 ... Main body, 11 ... Motor housing, 12 ... Handle housing, 12a ... Base, 12b ... Handle part, 12c ... connecting part, 13 ... gear cover, 15 ... protective cover, 16 ... saw blade (rotating tool), 17 capacitor accommodation part, 18 ... reactor accommodation part, 19 ... control circuit accommodation part, 20 ... tilting support mechanism, 25 ... oscillation Support mechanism (cut depth adjustment mechanism), 30: base, 42: diode bridge, 43: inverter circuit, 50: control unit (controller), 51: AC power supply, 52: filter circuit, 53: IPD circuit, 54: Regulator, 60 ... power line, Rs ... detection resistor

Claims (15)

A brushless motor, a housing for accommodating the brushless motor, a rotating tool rotated by the brushless motor, a handle connected to the housing, a rectifying circuit which converts alternating current into direct current and supplies the direct current to the brushless motor; A capacitor for smoothing the output current of the rectifier circuit, and a reactor provided in a current path of the brushless motor, wherein the brushless motor and the rotating tool pass through the central axis of the handle and of the electric power tool A portable power tool, located opposite to each other across a virtual plane parallel to a working direction, wherein the reactor is accommodated in the housing on the opposite side of the rotating tool with respect to the virtual plane. The portable electric motor according to claim 1, further comprising: a reduction mechanism configured to reduce the speed of rotation of the brushless motor and transmit the rotation to the rotating tool, wherein the reduction mechanism is provided on the opposite side of the reactor with respect to the virtual plane. tool. A power supply cord having a drive circuit for supplying a drive current to the brushless motor and a controller for controlling the drive circuit, wherein a power supply cord connectable to an AC power supply extends from the vicinity of one end of the handle; The portable power tool according to claim 1, wherein the capacitor and the reactor are provided on the same side as the brushless motor with respect to the virtual plane and around the brushless motor. The capacitor and the reactor are located on the opposite side of the extension source of the power cord across the brushless motor in the work direction, and the controller is located on the extension source side of the brushless motor in the work direction The portable power tool according to claim 3. 5. The portable device according to claim 4, wherein the capacitor and the reactor are located outside the existing range of the handle in the working direction, and the controller is located or extended in the existing range of the handle in the working direction. Power tools. The switch has a switch provided in the current path of the brushless motor for switching between conduction and interruption of the current path, the switch is provided in the handle, and the reactor is disposed ahead of the switch. 6. A portable power tool according to item 4 or 5. The capacitor is located on the opposite side of the extension source of the power supply cord across the brushless motor in the working direction, and the controller and the reactor are located on the extension source side of the brushless motor in the working direction The portable power tool according to claim 3. The mobile phone according to claim 7, wherein the capacitor is located outside the range of existence of the handle in the working direction, and the controller and the reactor are located or extend in the range of existence of the handle in the direction of working. Power tools. The switch has a switch provided in a current path of the brushless motor for switching between conduction and interruption of the current path, the switch is provided in the handle, and the reactor is disposed rearward of the switch. 9. A portable power tool according to item 7 or 8. A brushless motor, a housing having a motor housing portion and a handle portion for housing the brushless motor, a rectifier circuit for converting alternating current into direct current and supplying the same to the brushless motor, and a capacitor for smoothing an output current of the rectifier circuit; And a reactor provided in a current path of the brushless motor, wherein the reactor is disposed at a position passing a central axis of the handle portion and crossing a virtual plane parallel to the working direction of the electric power tool Power tools. The portable power tool according to claim 10, wherein the reactor is provided in the handle portion. The portable power tool according to claim 10 or 11, wherein a power supply cord connectable to an AC power supply extends from the vicinity of one end of the handle portion. It has a switch provided in the current path of the brushless motor for switching between conduction and interruption of the current path, the switch is provided in the handle portion, and the reactor includes the switch and the extension source of the power supply cord. The portable power tool according to claim 12, provided between A switch provided in a current path of the brushless motor for switching between conduction and interruption of the current path, the switch being provided in the handle portion and between the reactor and an extension source of the power cord; A portable power tool according to claim 12. The portable power tool according to any one of claims 10 to 14, wherein the center of gravity of the power tool is on the virtual plane.

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