WO2018163643A1

WO2018163643A1 - Portable electric tool

Info

Publication number: WO2018163643A1
Application number: PCT/JP2018/002447
Authority: WO
Inventors: 慎治倉賀野; 健熊倉; 拓家吉成
Original assignee: 工機ホールディングス株式会社
Priority date: 2017-03-07
Filing date: 2018-01-26
Publication date: 2018-09-13
Also published as: JP6760478B2; JPWO2018163643A1

Abstract

Provided is a portable electric tool having a satisfactory weight balance in a configuration in which a reactor is provided in a current pathway of a motor. A portable cutting machine 1 comprises: a motor 6; a motor housing 11 accommodating the motor 6; a saw blade 16 rotated by the motor 6; a handle housing 12 connected to the motor housing 11; a rectifier circuit which converts alternating current into direct current and supplies the direct current to the motor 6; electric field capacitors C2, C3 which smooth the output current from the rectifier circuit; and a reactor L2 provided in the current pathway of the motor 6. The motor 6 and the saw blade 16 are located on mutually opposite sides of a virtual plane P which passes through a central axis of a handle portion 12b and which is parallel to a direction of operation of the portable cutting machine 1. The reactor L2 is located on the opposite side of the virtual plane P to the saw blade 16.

Description

Portable power tools

The present invention relates to an AC-driven portable power tool that uses a brushless motor as a drive source.

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

JP 2013-193133 A

In an AC-driven power tool, it is preferable to reduce the harmonics. However, when the capacity of the smoothing capacitor is increased, there is a problem that the power factor is deteriorated and the harmonics are increased. As a countermeasure for this problem, it is conceivable to provide a reactor (coil) in the current path of the motor. Harmonic countermeasure reactors are large in size and weight to allow a large motor current, and thus have a large effect on the product weight balance.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a portable electric tool having a good weight balance in a configuration in which a reactor is provided in a current path of a motor.

One embodiment of the present invention is a portable power tool. The portable electric tool includes a brushless motor, a housing that houses the brushless motor, a rotating tool that is rotated by the brushless motor, a handle that is connected to the housing, and an alternating current that is converted into a direct current. A rectifier circuit supplied to the capacitor, 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 are provided with a central axis of the handle. And the reactors are accommodated in the housing on the opposite side of the rotating tool with respect to the virtual plane, with the virtual plane parallel to the working direction of the power tool.

A reduction mechanism that decelerates and transmits the rotation of the brushless motor to the rotating tool may be provided, and the reduction mechanism may be provided on the opposite side of the reactor with respect to the virtual plane.

A power supply cord that can be connected to an AC power supply extends from the vicinity of one end of the handle, and includes a drive circuit that supplies a drive current to the brushless motor and a controller that controls the drive circuit. The capacitor and the reactor may be 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 working direction, and the controller is located on the extension source side of the brushless motor in the working direction. May be.

The capacitor and the reactor may be located outside the range where the handle exists in the working direction, and the controller may be located or extend within the range where the handle exists in the working direction.

A switch provided on 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 may be disposed ahead of the switch. .

The capacitor is located on the opposite side of the extension source of the power 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. May be.

The capacitor may be positioned outside the range where the handle exists in the working direction, and the controller and the reactor may be positioned or extend within the range where the handle exists in the working direction.

The switch may be provided in a 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 arranged behind the switch. .

It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

ADVANTAGE OF THE INVENTION According to this invention, the portable electric tool with a favorable weight balance can be provided in the structure which provided the reactor in the electric current path | route of a 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. 1 is a cross-sectional plan view of a portable cutting machine 1. FIG. 4 is a side sectional view of the main body 10 of the portable cutting machine 1 (AA sectional view 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 concerning Embodiment 3 of the present 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 concerning Embodiment 4 of the present 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, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

(Embodiment 1) With reference to FIGS. 1-4, the mechanical structure of the portable cutting machine 1 as a portable electric tool which concerns on Embodiment 1 of this invention is demonstrated. 1 to 3 define the front, back, top, bottom, left and right directions orthogonal to each other. 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-right direction is defined with reference to the case where the front direction (cutting progress direction) is viewed. FIG. 3 shows a virtual plane P that passes through the central axis of the handle portion 12 b and is parallel to the cutting progress direction of the portable cutting machine 1.

Here, the portable cutting machine 1 is a portable circular saw, and includes a main body 10 and a base 30. The main body 10 is connected and supported to the base 30 by a known tilt support mechanism 20 and swing support mechanism 25. The main body 10 can be tilted in at least one direction 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 swung in the vertical direction with respect to the base 30 by the support of the swing support mechanism (cut depth adjusting mechanism) 25. The base 30 is 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 includes a motor housing 11, a handle housing 12, a gear cover 13, a capacitor housing portion 17, a reactor housing portion 18, and a control circuit housing portion 19 which are combined and integrated with each other. The

The motor housing 11 is a resin molded body, for example, and accommodates the motor 6 shown in FIGS. 3 and 4 inside. The motor 6 is an inner rotor type brushless motor, and a rotor core 6b made of a magnetic body 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 molded body having 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 a base portion 12a that accommodates a part of the control board 41, a handle portion 12b that serves as a grip portion, and a front end portion of the handle portion 12b and the base portion 12a. A connecting portion 12c. The rear end portion of the base portion 12a and the rear end portion of the handle portion 12b are connected to each other. The handle portion 12b 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 that is turned on and off by the trigger portion 5 is provided in the handle portion 12b. A power cord 7 connected to the AC power source 51 in FIG. 5 extends from the vicinity of the rear end portion of the handle housing 12.

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

The capacitor accommodating portion 17 is, for example, a resin molded body, and is provided adjacent to the motor housing 11 and in front of the motor housing 11. The capacitor accommodating portion 17 accommodates the electrolytic capacitors C2 and C3 for smoothing inside. The reactor accommodating portion 18 is, for example, a resin molded body, and is provided above the capacitor accommodating portion 17 adjacent to the capacitor accommodating portion 17. Reactor accommodating part 18 accommodates reactor L2 for harmonic measures inside. 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. Capacitor housing portion 17 and reactor housing portion 18 may be separate molded bodies or may be an integral molded body. Moreover, the capacitor | condenser accommodating part 17, the reactor accommodating part 18, and the control circuit accommodating part 19 may be a molded object integral with the left side part of the handle housing 12. FIG. A power line 60 extending from the control circuit housing part 19 and passing above the motor housing 11 is wired in the reactor housing part 18, and the diode bridge 42 and the reactor L <b> 2 are connected by the power line 60.

As shown in FIG. 3, the motor 6, the motor housing 11, electrolytic capacitors C2, C3, and the reactor L2 are located on the left side of the virtual plane P. Electrolytic capacitors C2 and C3 and reactor L2 are provided around motor 6. The control board 41 exists on the left side of the right end surface of the handle housing 12, and most of the control board 41 is located on the left side of the virtual plane P. On the right side of the virtual plane P, the gear cover 13, the saw blade 16, and the speed reduction mechanism 8 are located. The electrolytic capacitors C2, C3 and the reactor L2 are located in front of the motor 6, that is, on the opposite side of the extension of the power cord 7 across the motor 6 in the front-rear direction. The control board 41 is located behind the motor 6, that is, on the extending source side of the power cord 7 with respect to the motor 6 in the front-rear direction. The electrolytic capacitors C2, C3 and the reactor L2 are located outside the existing range of the handle portion 12b (in front of the existing range) in the front-rear direction. The control board 41 is positioned or extends within the existence range of the handle portion 12b 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 source 51 through a filter circuit 52 for noise suppression. 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 short-circuited. The varistor Z1 is for absorbing surge voltage. The pattern fuse F1 has a role of preventing a short circuit between lines when the varistor Z1 is activated. The capacitor C1 and the choke coil L1 are for removing noise between lines. The resistor R1 is a discharge resistor of the capacitor C1. The diode bridge 42 performs full-wave rectification on the output current (alternating current) from the filter circuit 52 and converts it into direct current.

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 between the diode bridge 42 and the inverter circuit 43 (current path of the motor 6). One end of the reactor L <b> 2 is connected to one output terminal of the diode bridge 42. The other end of reactor L2 is connected to one end of electrolytic capacitors C2 and C3. The other ends of the electrolytic capacitors C2 and C3 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 and off by operating the trigger unit 5. The trigger unit 5 is an operation unit of a two-pole trigger switch. When the contact switch 5 a is turned on by the operation of the trigger unit 5, the contact connected to the control unit 50 is closed at the same time, 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, and performs a switching operation under the control of the control unit 50, whereby the stator coil 6e (U, V) of the motor 6 is operated. , W windings). 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 controller 50 detects the current (load) of the motor 6 based on 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 voltages of the plurality of Hall ICs 45.

The anode of the diode D1 is connected to one output terminal of the diode bridge. The cathode of the diode D1 is connected to the first input terminal of the IPD circuit 53. A second input 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, or the like, which is an intelligent power device, and DC-DC switching that reduces the voltage between the output terminals of the diode bridge 42 to, for example, about 18V. 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 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 operating the trigger unit 5, the control unit 50 performs switching control (for example, PWM control) on the switching elements Q1 to Q6 and drives the motor 6.

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

In the portable cutting machine 1, the saw blade 16 side (the speed reduction mechanism 8 side) tends to be heavy due to the 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 has a weight smaller than that of the brushed motor, the portable cutting machine 1 is heavier on the saw blade 16 side than a portable cutting machine using a brushed motor 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 deterioration in operability caused by the position of the center of gravity approaching 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 as compared with the case without the reactor L2, and the front end of the base 30 is cut. Positioning at the start of cutting after being placed on the top surface of the material is easy to perform, and fluttering of the front portion of the portable cutting machine 1 during cutting work can be suppressed, so workability is particularly good at high output.

The reactor L2 is arranged so as not to affect the grip of the handle portion 12b, and it is not necessary to raise the position of the handle portion 12b in order to provide the reactor L2.

In the portable cutting machine 1, the power cord 7, the diode bridge 42 (the control board substrate 41 on which the power cord 7 is mounted), the reactor L 2 and the rear are arranged in this order, so that the circuit configuration shown in FIG. Since no extra wiring is required, assembly is facilitated and costs can be reduced.

Since the reactor accommodating part 18 is located above the capacitor accommodating part 17, when connecting the power line 60 from the control board 41 to the reactor L2 through the upper part of the motor housing 11, wiring can be shortened.

(Embodiment 2) FIG. 6 is a sectional side view of a main body 10 of a portable cutting machine according to Embodiment 2 of the present invention. In the portable cutting machine of the present embodiment, the vertical relationship between the electrolytic capacitors C2, C3 and the capacitor housing portion 17, and the reactor L2 and the reactor housing portion 18 is opposite to that of the first embodiment. It is different in other points, and is the same in other points. This embodiment can also achieve the effects (1) to (4) of the first embodiment. In addition, as a result of arranging the reactor L2 below the capacitor housing portion 17, the power line 60 passing above the motor housing 11 becomes slightly longer, but by placing the heavy-weight reactor L2 below, the position of the center of gravity is further increased. The stability can be improved during operation.

(Embodiment 3) FIG. 7 is a plan sectional view of a portable cutting machine according to Embodiment 3 of the present invention. FIG. 8 is a side sectional view of the main body 10 shown in FIG. Compared to the portable cutting machine of the first embodiment, the reactor cutting section 18 is eliminated, and the reactor L2 is housed in the control circuit housing section 19 together with the control board 41, behind the motor 6. It is different in terms of location, and matches in other respects. In the case of the third embodiment, the reactor L2 is located above the control board 41. Similarly to the first embodiment, the present embodiment can also bring the center of gravity position closer to the central axis side of the handle portion 12b in the left-right direction. Moreover, since the portable cutting machine of this Embodiment has heavy objects, such as the motor 6 and the speed reduction mechanism 8, arrange | positioned ahead from the grip part center (slightly rear part of a trigger part) of the handle part 12b, When the portable cutting machine 1 is lifted by holding the part 12b, the front end portion of the portable cutting machine tends to tilt downward, but in this embodiment, the reactor L2 is positioned behind the handle part 12b in the front-rear direction. Since the center of gravity of the portable cutting machine 1 is closer to the center in the front-rear direction of the handle part 12b in the front-rear direction, the base 30 is held when the portable cutting machine 1 is held by holding the handle part 12b. Easy to level. Accordingly, for example, the portable cutting machine 1 can be rotated 90 ° clockwise from the state of FIG. 1 to improve the stability during the work of cutting upward or during transportation. Further, the reactor L2 may be provided on the input side of the diode bridge 42 in order to exhibit the effect of suppressing harmonics when connected to the input side of the electrolytic capacitors C2 and C3. In this case, in the case of the third embodiment, by arranging the reactor L2 in the vicinity of the diode bridge 42 and the power cord 7, the wiring between the diode bridge 42 and the reactor L2 can be shortened, and the assembly property is good and the cost is low. The suppressed portable cutting machine 1 can be realized.

(Embodiment 4) FIG. 9 is a plan sectional view of a portable cutting machine according to Embodiment 4 of the present invention. 10 is a side sectional view of the main body 10 shown in FIG. FIG. 9 shows a virtual plane P that passes through the central axis of the handle portion 12 b and is parallel to the working direction of the portable cutting machine 1. Compared to the portable cutting machine of the first embodiment, the portable cutting machine of the present embodiment does not have the reactor accommodating portion 18, and the reactor L2 is located inside the vicinity of the interconnecting portion of the base portion 12a of the handle housing 12 and the handle portion 12b. That is, it is arranged at a position where the virtual plane P near the extension source of the power cord 7 crosses. Reactor L2 is located between contact switch 5a and the extension source of power cord 7. On the left side of the virtual plane P, the motor 6, the motor housing 11, and the electrolytic capacitors C2 and C3 are located. The electrolytic capacitors C2 and C3 and the control board 41 are provided around the motor 6. The control board 41 exists on the left side of the right end surface of the handle housing 12, and most of the control board 41 is located on the left side of the virtual plane P. On the right side of the virtual plane P, the gear cover 13, the saw blade 16, and the speed reduction mechanism 8 are located. The center of gravity of the portable cutting machine of the present embodiment is preferably on the virtual plane P.

According to the present embodiment, the reactor L2 is arranged at a position where the virtual plane P crosses, in other words, the reactor is placed on a plane parallel to the work direction and passing through the handle axis (in this case, a plane extending in the up-down and front-back directions). If the position of the center of gravity of the portable cutting machine 1 deviates from the center axis of the handle portion 12b without the reactor L2, the reactor L2 is provided so that the position of the center of gravity is determined by providing the reactor L2. When the center of gravity position coincides with the center axis of the handle portion 12b in the absence of the reactor L2, the shift of the center of gravity position due to the provision of the reactor L2 can be suppressed ( Even when the reactor L2 is provided, it is possible to maintain a state where the position of the center of gravity coincides with the central axis of the handle portion 12b). Therefore, the weight balance of the portable cutting machine 1 can be improved, and deterioration in operability due to the provision of the reactor L2 can be suppressed. Further, since the reactor L2 is provided in the vicinity of the rear end portion of the handle portion 12b, the center of gravity of the portable cutting machine 1 is closer to the center in the front-rear direction of the handle portion 12b in the front-rear direction, and the portable cutting device is held by the handle portion 12b. It is easy to level the base 30 when holding the machine 1.

(Embodiment 5) FIG. 11 is a side sectional view of a main body 10 of a portable cutting machine according to Embodiment 5 of the present invention. The portable cutting machine of this embodiment is different from that of the fourth embodiment in that the position of the reactor L2 in the front-rear direction is changed, specifically, the reactor L2 is connected to the handle portion 12b of the handle housing 12 and the connecting portion. 12c is different in that it is provided in the vicinity of the interconnecting part 12c or in the connecting part 12c, and is the same in other points. This embodiment can also achieve the same effects as those of the first embodiment with respect to the center of gravity position in the left-right direction. In the present embodiment, since the reactor L2 is provided at the front end of the handle housing 12, the center of gravity of the portable cutting machine 1 is closer to the front than in the case where there is no reactor L2, and the front end of the base 30 is It is easy to align 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.

The present invention has been described above by taking the embodiment as an example. However, 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. By the way. Hereinafter, modifications will be described.

The number of smoothing electrolytic capacitors is not limited to two, and may be one or three or more. Electrolytic capacitors C2, 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 DESCRIPTION OF SYMBOLS ... Connection part, 13 ... Gear cover, 15 ... Protection cover, 16 ... Saw blade (rotating tool), 17 Capacitor accommodating part, 18 ... Reactor accommodating part, 19 ... Control circuit accommodating part, 20 ... Tilt support mechanism, 25 ... Swing Support mechanism (cut depth adjusting 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

A brushless motor, a housing that houses the brushless motor, a rotating tool that is rotated by the brushless motor, a handle connected to the housing, a rectifier circuit that converts alternating current into direct current and supplies 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 the power tool. A portable power tool that is positioned on opposite sides of a virtual plane parallel to a working direction, and wherein the reactor is housed in the housing on the opposite side of the rotating tool with respect to the virtual plane.
2. The portable electric motor according to claim 1, further comprising a reduction mechanism that reduces the rotation of the brushless motor and transmits the reduced rotation to the rotating tool, and the reduction mechanism is provided on the opposite side of the reactor with respect to the virtual plane. tool.
A power supply cord that can be connected to an AC power supply extends from the vicinity of one end of the handle, and includes a drive circuit that supplies a drive current to the brushless motor and a controller that controls the drive circuit. The portable electric 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 working direction, and the controller is located on the extension source side of the brushless motor in the working direction. The portable power tool according to claim 3.
5. The mobile phone according to claim 4, wherein the capacitor and the reactor are located outside a range where the handle exists in the working direction, and the controller is located or extends within the range where the handle exists in the working direction. Power tools.
A switch provided on 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 ahead of the switch. Item 6. The portable power tool according to Item 4 or 5.
The capacitor is located on the opposite side of the extension source of the power 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 portable device according to claim 7, wherein the capacitor is located outside the range of presence of the handle in the work direction, and the controller and the reactor are located or extend within the range of presence of the handle in the work direction. Power tools.
A switch provided on 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 behind the switch. Item 9. The 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 brushless motor, a capacitor for smoothing the output current of the rectifier circuit, A reactor provided in a current path of the brushless motor, and the reactor is disposed at a position passing through a virtual plane passing through the central axis of the handle portion and parallel to the working direction of the power tool. Power tools.
The portable electric 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 cord that can be connected to an AC power source extends from the vicinity of one end of the handle portion.
A switch provided on a 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 an extension source of the switch and the power cord. The portable power tool according to claim 12, which is provided between the two.
A switch provided in a current path of the brushless motor, for switching between conduction and interruption of the current path, and the switch is provided in the handle portion and between the reactor and an extension source of the power cord; The portable power tool according to claim 12.
The portable power tool according to any one of claims 10 to 14, wherein a center of gravity of the power tool exists on the virtual plane.