JP2011125168A - Electric motor and working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor which has a rotor composed of a printed wiring board, enables easy manufacturing, and maintains high efficiency and a long service life, and to provide a working machine which is equipped with the electric motor. <P>SOLUTION: The motor 20 includes a rotating shaft 52 supported rotatably, a rotor 53 constituted of a coil disc 62, disposed coaxially and integrally with the rotating shaft 52 and a cylindrical commutator 63; a stator 54, which generates a magnetic flux passing through the coil disc 62 in the direction of the axis 7 of the rotating shaft 52; and a slider 55, which comes into slide contact with the outer peripheral surface of the commutator 63, from a direction substantially perpendicular to the axis 7 of the rotating shaft 52. A blower 1 includes the motor 20 and a fan 30, which receives power from the motor 20 and rotates. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric motor and a work machine using this as a drive source.

  Some electric motors include a rotor composed of a printed wiring board. For example, Patent Document 1 discloses a disk-shaped rotor (rotor) configured from a laminate of a commutator disk on which a commutator conductor pattern is formed and a coil disk on which a coil conductor pattern is formed. ing. Many of such electric motors are characterized by being flat and small in shape and having low vibration and noise, and are attracting attention as drive sources for various work machines.

JP 2003-299288 A

  Since the rotor (rotor) described in Patent Document 1 includes a connection disk for connecting the commutator disk and the coil disk, the manufacturing process is complicated. In addition, the commutator formed of the conductor pattern is likely to cause surface runout due to distortion of the commutator disk, thereby reducing the rectification performance, and thus easily lowering the motor efficiency. Further, the commutator is worn by sliding with the brush, but the commutator formed by the conductor pattern has a short life because of its limited thickness.

  In view of the above problems, an object of the present invention is to provide an electric motor that includes a rotor composed of a printed wiring board, is easy to manufacture, has high efficiency and has a long life, and a work machine including the same. .

In order to achieve the above object, an electric motor according to the present invention comprises:
A rotating shaft rotatably supported;
A disk-like printed wiring board provided coaxially with the rotating shaft and formed with a conductor pattern of a plurality of coils arranged in the circumferential direction, and a conductor pattern of the plurality of coils arranged in the circumferential direction A rotor having a cylindrical commutator composed of a plurality of connected commutator pieces;
A stator that generates magnetic flux that passes through the printed wiring board in the axial direction of the rotating shaft;
A slider that is in sliding contact with the outer peripheral surface of the commutator from a direction substantially orthogonal to the axis of the rotation shaft;
It is characterized by that.

The printed wiring board is composed of a plurality of coil disks on which a conductor pattern constituting a part of the plurality of coils is formed.
It is desirable.

  For example, the plurality of commutator pieces may be soldered directly onto the conductor pattern of the printed wiring board.

For example, the printed wiring board is provided with a plurality of through holes that connect the plurality of commutator pieces and the conductor patterns of the plurality of coils.
The plurality of commutator pieces may have protrusions inserted through the plurality of through holes.

The rotor includes a flange having a flat surface substantially perpendicular to the axis of the rotation shaft,
The printed wiring board is supported on the flat surface of the flange,
It is desirable.

The rotor further includes positioning means for positioning the printed wiring board and the commutator in a circumferential direction.
It is desirable.

The slider is provided to be exchangeable,
It is desirable.

In addition, in order to achieve the above object, the work machine according to the present invention includes:
The above electric motor;
A work tool that operates by receiving power from the electric motor,
It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, the rotor comprised from a printed wiring board is provided, and it is easy to manufacture, and can provide a highly efficient and long-life electric motor, and a working machine provided with this.

The side view which shows the air blower which concerns on embodiment of this invention. II sectional view taken on the line of FIG. FIG. 3 is an exploded view showing a rotor and a rotating shaft shown in FIG. 2. FIG. 4 is a top view showing the flange shown in FIG. 3. FIG. 4 is a top view showing the coil disk shown in FIG. 3. FIG. 4 is a top view showing the commutator shown in FIG. 3. FIG. 3 is a top view showing a rotor and a rotation shaft shown in FIG. 2. The exploded view which shows the modification of a rotor shown in FIG. 2, and a rotating shaft. The top view which shows the coil disk shown by FIG. The top view which shows the commutator shown by FIG. The top view which shows the modification of a rotor shown by FIG. 2, and a rotating shaft.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Embodiment 1)
The blower according to Embodiment 1 is the blower 1 shown in FIG. The blower 1 includes a main body 3 and a nozzle 5.

  As shown in FIG. 2, the main body 3 includes a casing 10, a motor 20, and a fan 30.

  The casing 10 includes a motor case 11 and a fan case 12. The motor case 11 and the fan case 12 are disposed adjacent to each other in the direction of the axis 7 indicating the rotation axis of the motor 20. Further, the motor case 11 is composed of two split cases 11a and 11b joined and fastened in the direction of the axis 7. The fan case 12 is composed of two split cases 12a and 12b joined and fastened in the direction of the axis 7. The case 11b of the motor case 11 and the case 12a of the fan case 12 adjacent to each other in the direction of the axis 7 are integrally formed.

  The motor case 11 is formed with a plurality of vents 13 for taking air (outside air) into the motor case.

  The fan case 12 is formed with a suction port 14 and a blowout port 15 (see FIG. 1). The suction port 14 protrudes from the case 12b to the side opposite to the motor 20 substantially coaxially with the axis 7, and is formed in a cylindrical shape. As can be understood from FIGS. 1 and 2, the air outlet 15 protrudes from the cases 12 a and 12 b in a direction substantially perpendicular to the axis 7 (tangential direction of the fan 30) and is formed in a cylindrical shape. An attachment such as a hose or a nozzle can be attached to the suction port 14. In addition to the nozzle 5 shown in FIG. 1, an attachment such as a hose or a dust bag can be attached to the outlet 15.

  Further, as shown in FIG. 2, the casing 10 is provided with a handle 16. The handle 16 is disposed over the motor case 11 and the fan case 12, specifically, over the case 11 b constituting the motor case 11 and the case 12 a constituting the fan case 12. The handle 16 is composed of two split handle members 16a and 16b joined and fastened in the direction of the axis 7. The handle member 16 a is formed integrally with the case 11 a constituting the motor case 11. Further, the handle member 16 b is formed integrally with a case 11 b constituting the motor case 11 and a case 12 a constituting the fan case 12.

  As shown in FIG. 1, the handle 16 is provided with a power cord 18 having a power plug 17 and a trigger switch 19. The power cord 18 supplies power from an AC power source connected to the power plug 17 to a power circuit (not shown) housed in the casing 10. The power supply circuit converts the power of the AC power source into a predetermined DC voltage and supplies it to the motor 20. The trigger switch 19 has a function of turning on / off the output voltage of the power supply circuit and adjusting the output voltage of the power supply circuit in accordance with the pulling amount. Therefore, by operating the trigger switch 19, the motor 20 can be driven / stopped and the output (rotation speed) of the motor 20 can be adjusted.

  As shown in FIG. 2, the motor 20 is a commutator motor including a rotating shaft 52, a rotor 53, a stator 54, and a pair of sliders 55.

  The rotary shaft 52 is supported by bearings 57 and 58 provided in the motor case 11 so as to be rotatable around the axis 7. One end of the rotating shaft 52 protrudes from the motor case 11 to the fan case 12 and is connected to the fan 30.

  The rotor 53 is provided integrally with the rotating shaft 52, is formed in a disk shape centered on the axis 7, and is accommodated in the motor case 11. As shown in FIG. 3, the rotor 53 includes a flange 61, a plurality of (six) coil disks 62, and a commutator 63.

  The flange 61 is made of an aluminum alloy, and has a cylindrical fixing portion 61a centered on the axis 7 and a disk having a flat surface substantially perpendicular to the axis 7 and extending from the outer peripheral surface of the fixing portion 61a. It is comprised from the shape-like support part 61b. As shown in FIG. 4, a keyway 61c is formed on the inner peripheral surface of the fixed portion 61a. A pair of engaging recesses 61d are formed on the outer peripheral surface of the fixed portion 61a. As can be understood from FIGS. 3 and 4, the flange 61 has a fixed portion 61 a fitted to the rotary shaft 52 and a key groove 61 c fitted to the key 52 c of the rotary shaft 52. The rotation stopper is fixed.

  The coil disk 62 is a printed wiring board composed of an insulating substrate and a conductor pattern, and is formed in a disk shape centering on the axis 7 as shown in FIGS.

  As shown in FIG. 5, on the upper surface of the coil disk 62, a plurality of coil pieces 82 formed radially with the axis 7 as a center are formed by a conductor pattern. The outer end 82b of each coil piece 82 is formed by bending in a predetermined direction around the axis 7. A through hole 83 a that penetrates the coil disk 62 is formed in the inner end 82 a of each coil piece 82. A through hole 83 b that penetrates the coil disk 62 is formed in the outer end 82 b of each coil piece 82.

  Although not shown, a plurality of unillustrated coil pieces radially formed around the axis 7 are formed on the lower surface of the coil disk 62 by a conductor pattern, similar to the upper surface of the coil disk 62. . The outer end portion of each coil piece (not shown) is connected to the outer end portion 82b of the corresponding coil piece 82 on the upper surface of the coil disk 62 via solder filled in the through hole 83b. In addition, the inner end of each coil piece (not shown) is connected to the inner end 82a of another corresponding coil piece 82 on the upper surface of the coil disk 62 via solder filled in the through hole 83a. Thus, the plurality of coil pieces 82 on the upper surface of the coil disk 62 and the plurality of coil pieces (not shown) on the lower surface of the coil disk 62 are substantially annular (substantially U-shaped) arranged in the circumferential direction when viewed in the direction of the axis 7. A plurality of coils 81 are configured.

  As shown in FIG. 5, the coil disk 62 is formed with a mounting hole 62 a having a pair of engaging protrusions 62 d centering on the axis 7. 4 and 5, the mounting hole 62a of the coil disk 62 and the outer peripheral surface of the fixing portion 61a of the flange 61 are formed so as to be fitted. Furthermore, the engaging convex part 62d of the coil disk 62 and the engaging concave part 61d of the flange 61 serve to position the coil disk 62 and the flange 61 in the circumferential direction. Therefore, the plurality of coil disks 62 shown in FIG. 3 are stacked on the support part 61b of the flange 61 by fitting with the fixing part 61a of the flange 61, so that each coil disk 63 is viewed in the direction of the axis 7. The plurality of coils 81 and the through holes 83a and 83b are positioned in the circumferential direction so as to overlap each other. The coil disk 62 and the support portion 61b of the flange 61 are fixed by an adhesive, and the plurality of coil disks 63 are stacked on each other via an insulating layer (not shown). The plurality of coils 81 formed on each coil disk 62 are connected in parallel to the plurality of coils 81 formed on the other coil disks 63 via solder filled in the through holes 83a.

  As shown in FIGS. 3 and 6, the commutator 63 includes a cylindrical base portion 90 centering on the axis 7, and a plurality of commutator pieces 92 arranged in the circumferential direction along the outer peripheral surface of the base portion 90. And is formed in a cylindrical shape. The base part 90 is formed from a synthetic resin, and the plurality of commutator pieces 92 are formed from a copper alloy. Further, a flat plate-like projecting portion 93 that projects from the outer peripheral surface in a direction substantially perpendicular to the axis 7 is integrally formed at the end of each commutator piece 92 on the coil disk 62 side. The arrangement of the plurality of commutator pieces 92 corresponds to the arrangement of the inner end portions 82a and the through holes 83a of the plurality of coil pieces 82 of the coil disk 62, as can be understood by referring to FIGS.

  As shown in FIG. 6, the base portion 90 of the commutator 63 is formed with a mounting hole 63 a having a pair of engaging convex portions 63 d around the axis 7. 4 and 6, the attachment hole 63a of the commutator 63 and the outer peripheral surface of the fixing portion 61a of the flange 61 are formed so as to be fitted. Furthermore, the engaging convex part 63d of the commutator 63 and the engaging concave part 61d of the flange 61 serve to position the commutator 63 and the flange 61 in the circumferential direction. Therefore, the commutator 63 shown in FIG. 3 is fitted on the fixing portion 61a of the flange 61 and placed on the coil disk 62, so that each commutator piece is viewed in the direction of the axis 7 as shown in FIG. The protruding portions 93 of the coil 92 are positioned in the circumferential direction so as to be positioned on the inner end portions 82 a of the coil pieces 82 and the through holes 83 a of the coil disk 62. The commutator 63 and the flange 61 are fixed by an adhesive, and the protruding portion 93 of the commutator piece 92 and the inner end portions 82a of the plurality of coil pieces 82 of the coil disk 62 are soldered directly. Accordingly, each commutator piece 92 is connected to a corresponding coil 91 formed on the coil disk 62 via each through hole 83 a of the coil disk 62.

  The engaging recess 61d of the flange 61, the engaging convex portion 62d of the coil disk 62, and the engaging convex portion 63d of the commutator 63 constitute the positioning means of the present invention.

  As shown in FIG. 2, the stator 54 includes a magnet 71 that is a permanent magnet and a pair of yokes 72 and 73. The pair of yokes 72 and 73 are formed in an annular plate shape from a magnetic material such as iron and are fixed to the motor case 11. The yoke 72 is disposed on the case 11 b so as to face the lower surface of the coil disk 63. The yoke 73 is disposed on the case 11 a so as to face the upper surface of the coil disk 63. The magnet 71 has a plurality of magnetic poles arranged in the circumferential direction, is formed in an annular shape, and is fixed to the upper surface of the yoke 72. Therefore, the pair of yokes 72 and 73 form a magnetic path so that the magnetic flux generated by the magnet 71 passes through the coil disk 62 in the direction of the axis 7.

  The pair of sliders 55 are held by a pair of slider holders 59 fixed to the motor case 11, and are arranged with the axis 7 and the commutator 63 interposed therebetween. The pair of sliders 55 are urged toward the peripheral surface of the commutator 63 from a direction substantially orthogonal to the axis 7 by a biasing means (not shown), and the outer peripheral surface of the commutator 63 (the commutator piece 92 shown in FIG. 6). Slidably contact with the outer peripheral surface). The slider 55 is made of carbon having electrical conductivity, and is connected to the power supply circuit described above. The slider holder 59 that holds the slider 55 is provided with a cap (not shown) that is detachably screwed, and the slider 55 can be exchanged from the outside by removing the cap. Is provided.

  The fan 30 is coupled to the rotating shaft 52 of the motor 20 and is accommodated in the fan case 12. The fan 30 includes an attachment portion 31 fixed to the rotary shaft 52 with screws, a disk-like substrate portion 32 extending substantially perpendicularly to the axis 7 from the attachment portion 31, and extending from the substrate portion 32 to the non-motor 20 side. It is a centrifugal fan comprised from the several blade | wing part 33 to take out. The board portion 32 is formed with a vent 34 for sucking the air in the motor case 11 between the plurality of blade portions 33. Further, the plurality of blade portions 33 are bent in the counter-rotating direction of the fan 30 toward the outer diameter direction of the fan 30 and formed in a spiral shape when viewed in the direction of the axis 7.

  Next, operation | movement of the air blower 1 of the said structure is demonstrated.

  When the trigger switch 19 is turned on, a predetermined voltage is applied to the slider 55 of the motor 20 from a power supply circuit (not shown).

  The voltage applied to the pair of sliders 55 of the motor 20 is applied to the coil 81 of the coil disk 62 that passes the magnetic flux generated by the stator 54 via the commutator 63. Since a current flows in the coil 81 to which the voltage is applied in a direction perpendicular to the magnetic flux generated by the stator 54 and in a direction perpendicular to the axis 7, a rotational force about the axis 7 is generated in the coil disk 62. . Therefore, the rotor 53 having the coil disk 62, the rotating shaft 52 fixed to the rotor 53, and the fan 30 connected to the rotating shaft 52 rotate integrally around the axis 7.

  Air (outside air) is sucked into the fan case 12 from the suction port 14 by the rotational movement of the fan 30. The air sucked into the fan case 12 enters between the plurality of blade portions 33 of the fan 30, flows in the outer diameter direction of the fan 30 while rotating together with the fan 30, and is blown out from the outlet 15.

  Further, air (outside air) is sucked into the motor case 11 from the vent 13 by the rotational movement of the fan 30. The air sucked into the motor case 11 cools the coil disk 62 of the motor 20, and is sucked into the plurality of blade portions 33 from the air vent 34 formed in the substrate portion 32 of the fan 30, and from the air inlet 14. It merges with the sucked air and is blown out from the blowout port 15.

  Note that the blower 1 functions as a blower for blowing off dust and the like by attaching a hose or a nozzle to the outlet 15. The blower 1 functions as a dust collector for collecting dust and the like by attaching a hose and a nozzle to the suction port 14 and attaching a dust bag to the blowout port 15.

  As described above, the motor 20 having the above-described configuration is configured by the disk-shaped coil disk 62 provided coaxially with the rotating shaft 52 and formed with the conductor patterns of the plurality of coils 81 arranged in the circumferential direction. And a stator 54 that generates a magnetic flux that passes through the coil disk 62 in the direction of the axis 7 of the rotating shaft 52. Therefore, compared with a motor having a coil wound around a so-called core, the motor 20 has a flat and small shape in which the width in the direction of the axis 7 is suppressed. Further, since the coil disk 62 constituting the rotor 53 is lightweight, the motor 20 is lightweight and starts up quickly. In addition, since the coil disk 62 constituting the rotor 53 does not require a so-called coil end (a bent portion that protrudes from the core in the coil wound around the core), the motor 20 is configured to be flatter and more compact, Heat generation of the coil 81 is suppressed. Further, since the rotor 53 constituted by the coil disk 62 has a large surface area, that is, a heat radiation area, the motor 20 is excellent in the cooling capacity of the coil 81. Therefore, the output reduction of the motor 20 due to overheating of the coil 81 is suppressed, and the means for cooling the coil 81 is simplified, for example, by reducing or omitting the vent hole 13 formed in the motor case 11 housing the motor 20. can do.

  In addition, the motor 20 includes a cylindrical commutator 63 that is provided coaxially with the rotating shaft 52 and includes a plurality of commutator pieces 92 arranged in the circumferential direction. Unlike the planar commutator (see, for example, Patent Document 1) formed on a printed wiring board by a conductor pattern, the commutator 63 does not cause surface vibration due to the load received from the slider 55, the distortion of the coil disk 62, or the like. Therefore, the stability of the connection with the slider 55 is excellent, and the rectification performance is excellent. Further, the commutator piece 92 formed by machining such as a press can be easily formed thicker than the commutator piece formed by the conductor pattern, so that the durability against abrasion due to sliding with the slider 55 is improved. Excellent. Therefore, according to the motor 20, a highly efficient and long-life motor can be realized.

  Moreover, the printed wiring board which comprises the rotor 53 is comprised from the laminated body of the some coil disc 62 in which the conductor pattern of the some coil 81 was formed, and the output of the motor 20 can be improved more. .

  Further, since the commutator piece 92 is directly soldered onto the conductor pattern of the coil disk 62, the manufacture of the motor 20 can be made easier.

  Further, since the coil disk 62 is supported by the support portion 61b of the flange 61, distortion of the coil disk 62 due to the load received from the slider 55, the suction force (repulsive force) received from the stator 54, and the like is suppressed. Therefore, the durability of the coil disk 62 can be improved, and the durability of the motor 20 can be improved.

  Further, since the rotor 53 includes positioning means for positioning the coil disk 62 and the commutator 63 in the circumferential direction, the motor 20 can be manufactured more easily. Furthermore, the variation in motor performance can be suppressed by suppressing the assembly error.

  Further, since the slider 55 is provided so as to be exchangeable from the outside without requiring disassembly of the motor 20, maintenance of the motor 20 is facilitated.

  Various work machines can be configured by using the motor 20 as a drive source. The blower 1 having the above configuration includes a motor 20 and a fan 30 that rotates by receiving power from the motor 20. Thereby, the air blower 1 has the advantage that it is easy to manufacture and has high efficiency and long life.

(Embodiment 2)
Next, the rotor 153 according to the second embodiment will be described with reference to FIGS. The rotor 153 is different from the rotor 53 of the first embodiment mainly in the connection method between the commutator 163 and the printed wiring board (coil disk 162). Hereinafter, although it demonstrates in detail, about the structure of the rotor 153, the same code | symbol is attached | subjected to the structure which is common in the rotor 53 of Embodiment 1, and the description is abbreviate | omitted.

  As shown in FIG. 8, the rotor 153 includes a flange 61, a plurality of (six) coil disks 162, and a commutator 163.

  As shown in FIG. 9, the coil disk 162 is different from the coil disk 62 (FIG. 5) of the first embodiment mainly in the size of the through hole 183 a that penetrates the inner ends 182 a of the plurality of coil pieces 182. To do. As can be seen from FIGS. 5 and 9, the through hole 183 a of the coil disk 162 is formed larger than the through hole 83 a of the coil disk 62.

  As shown in FIGS. 8 and 10, the commutator 163 is different from the commutator 63 (FIGS. 3 and 6) of the first embodiment in the shape of the protruding portion 193 of the commutator piece 192. The protrusion 93 of the commutator 63 is formed in a flat plate shape extending substantially perpendicular to the axis 7 from the outer peripheral surface, but the protrusion 193 of the commutator 163 is a columnar shape extending substantially parallel to the axis 7 from the outer peripheral surface. Is formed.

  The above-described coil disk 162 and commutator 163 are engaged with the fixing portion 61a of the flange 61, so that each protrusion 193 of the commutator 163 is inserted into each through hole 183a of the coil disk 162 as shown in FIG. As shown in FIG. Accordingly, each commutator piece 192 of the commutator 163 is connected to a corresponding coil 191 formed on the coil disk 162 via each through hole 183 a of the coil disk 162. Each protruding portion 193 is fixed to the plurality of coil disks 162 by soldering by inserting each through hole 183a with solder after being inserted into each through hole 183a.

  According to the rotor 153 having the above-described configuration, the same effect as that of the rotor 53 of the first embodiment can be obtained, and a manufacturing process can be performed by providing the commutator piece 192 with the protruding portion 193 inserted through the through hole 183a. Without complication, the connection between the commutator 163 and the coil disk 162 can be strengthened, and disconnection between the commutator piece 192 of the commutator 163 and the conductor pattern of the coil disk 162 can be suppressed. In addition, the plurality of coil disks 162 are connected not only to the through holes 183a but also to the protrusions 193 inserted into the through holes 183a via solder, so that the coil disks 162 are connected to the coil disks 162 from the commutator piece 192. It is possible to reliably supply power to the. As described above, it is possible to provide a motor that is easy to manufacture and that has a high efficiency and a long life.

(Modification)
In addition, this invention is not limited to the above-mentioned embodiment, What was variously changed in the range described in the claim is also included in the technical scope of this invention.

  For example, in the embodiment, the coil conductor pattern is formed on both surfaces of the coil disk 62, but may be formed only on one surface.

  In addition, the coil disks 62 and 162 of the embodiment are themselves printed wiring boards, but the coil disk according to the present invention is not limited to this, and may be, for example, each layer constituting a multilayer printed wiring board. .

  The form of the coil formed on the printed wiring board, the arrangement of the magnetic poles of the stator, and the like can be arbitrarily changed as long as the commutator motor can be configured.

  Further, the present invention is not limited to the blower shown in the embodiment, and can be widely applied to work machines using an electric motor as a drive source, and in particular, a brush cutter, a sander, a polisher, a router, and a dust collector. This is suitable for a working machine in which the power of an electric motor is directly transmitted to a work tool (a rotary blade, a fan, etc.) without using a reduction gear.

  In addition, the material, shape, quantity, arrangement, and the like of each component can be appropriately changed as long as the object of the present invention can be achieved.

DESCRIPTION OF SYMBOLS 1 Blower 3 Main body 5 Nozzle 7 Axis 10 Casing 11 Motor case 11a, 11b Case 12 Fan case 12a, 12b Case 13 Vent 14 Inlet 15 Outlet 16 Handle 16a, 16b Handle member 17 Power plug 18 Power cord 19 Trigger switch 20 Motor 30 Fan 31 Mounting portion 32 Substrate portion 33 Blade portion 34 Vent 52 52 Rotating shaft 52c Key 53 Rotor 54 Stator 55 Slider 57, 58 Bearing 59 Slider holder 61 Flange 61a Fixed portion 61b Support portion 61c Key groove 61d Engaging recess 62 Coil disk 62a Mounting hole 62d Engaging projection 63 Commutator 63a Mounting hole 63d Engaging projection 71 Magnet 72, 73 Yoke 81 Coil 82 Coil piece 82a Inner end 82b Outer end 83a, 83b Through hole 90 Bae Commutator piece 93 projecting part 153 rotor 162 coil disk 163 commutator 192 commutator piece 181 coil 182 coil piece 182a inner end 182b outer end 183a, b through hole 192 commutator piece 193 projecting part

Claims (8)

A rotating shaft rotatably supported;
A disk-like printed wiring board provided coaxially with the rotating shaft and formed with a conductor pattern of a plurality of coils arranged in the circumferential direction, and a conductor pattern of the plurality of coils arranged in the circumferential direction A rotor having a cylindrical commutator composed of a plurality of connected commutator pieces;
A stator that generates magnetic flux that passes through the printed wiring board in the axial direction of the rotating shaft;
A slider that is in sliding contact with the outer peripheral surface of the commutator from a direction substantially orthogonal to the axis of the rotation shaft;
An electric motor characterized by that. The printed wiring board is composed of a plurality of coil disks on which a conductor pattern constituting a part of the plurality of coils is formed.
The electric motor according to claim 1. The plurality of commutator pieces are soldered directly on the conductor pattern of the printed wiring board,
The electric motor according to claim 1, wherein the electric motor is provided. The printed wiring board is provided with a plurality of through holes that connect the plurality of commutator pieces and the conductor patterns of the plurality of coils,
The plurality of commutator pieces are formed with protrusions inserted through the plurality of through holes.
The electric motor according to claim 1, wherein the electric motor is provided. The rotor includes a flange having a flat surface substantially perpendicular to the axis of the rotation shaft,
The printed wiring board is supported on the flat surface of the flange,
The electric motor according to any one of claims 1 to 4, wherein the electric motor is provided. The rotor further includes positioning means for positioning the printed wiring board and the commutator in a circumferential direction.
The electric motor according to any one of claims 1 to 5, wherein: The slider is provided to be exchangeable,
The electric motor according to claim 1, wherein: The electric motor according to any one of claims 1 to 7,
A work tool that operates by receiving power from the electric motor,
A working machine characterized by that.

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