JP5854185B2 - Disk motor and electric working machine equipped with the same - Google Patents

Description

  The present invention relates to a disk motor having a coil disk and a commutator disk and rotationally driving an output shaft, and an electric working machine including the disk motor.

  A conventional disk motor is arranged so as to face an output shaft, a coil disk fixed to the output shaft and having a substantially disc shape and printed with a coil pattern, a commutator connected to the coil pattern, and the coil pattern. And a brush for supplying current to the commutator (see Patent Document 1 below).

  The rotational speed of the disk motor is determined by the voltage supplied from the brush, the current of the disk motor, the coil pattern of the coil disk, the magnetic flux of the magnet, the number of brushes (number of poles), and the like. If the voltage supplied from the brush and the current of the disk motor are constant, the disk motor can be set to the desired number of revolutions by changing the coil pattern of the coil disk, the magnetic flux of the magnet, and the number of brushes. It becomes.

JP 2003-299288 A

  In the disk motor of Patent Document 1, the connection between a plurality of coil disks and the connection with a commutator disk are unclear. In addition, it is unknown whether or not it has a flange provided integrally with the output shaft, and the stacking relationship between the flange and the commutator disk and the coil disk is also unknown. Here, it is conceivable to increase the mechanical strength of the commutator disk by bonding a flange to the back surface of the commutator disk surface on which the brush contacts and slides. In this case, the flange is sandwiched between the commutator disk and the coil disk. However, if there is a flange between them, it takes time to electrically connect the commutator disk and the coil disk, which is a cause of cost increase.

The present invention has been made in view of such a situation, and an object of the present invention is to easily perform electrical connection between the coil disks of the coil disk group and electrical connection between the coil disk group and the commutator disk. An object of the present invention is to provide a disc motor that can be used and an electric working machine including the disc motor.
The other purpose is to have a flange provided integrally with the output shaft, and the electrical connection between the commutator disk and the coil disk compared to the case where the flange is sandwiched between the commutator disk and the coil disk. An object of the present invention is to provide a disk motor that can be easily connected and an electric working machine including the disk motor.

The first aspect of the present invention is a disk motor. This disc motor
An output shaft;
A coil disk group comprising a plurality of coil disks on which conductors including a coil pattern are formed;
A commutator disk coaxially bonded to the surface of the coil disk group;
A current supply unit for supplying current to the coil pattern;
A magnetic flux generator facing the coil pattern,
The commutator disc to the through hole penetrating at least two of the coil disk group is formed, the conductor and the commutator pattern of the commutator disc at least two coil disks of the coil disk group, the through It is electrically connected at a position overlapping in the axial view by a conductor portion provided continuously in the axial direction inside the hole, and rotates integrally with the output shaft.

In the disk motor, the through hole may be provided through the commutator disk and the coil disk group, and the conductor portion may be provided through the commutator disk and the coil disk group .

In the disk motor,
A flange provided integrally with the output shaft;
The coil disk group is coaxially bonded on the flange with one surface as an adhesive surface,
The commutator disk may be coaxially bonded to the other surface of the coil disk group.
In this case, the flange may be approximately the same size as the commutator disk when viewed in the axial direction.
The conductor portion is a conductor film formed on the inner surface of the through hole,
An air hole communicating with the through hole and penetrating the flange is formed,
It is preferable that gas can pass through the through hole and the air hole.

  In the disk motor, the conductor portion may fill the inside of the through hole.

In the disk motor,
The current supply unit has a brush in contact with the commutator disk,
The brush may slide on the commutator disk relatively with the rotation of the commutator disk and pass over the opening of the through hole.

The second aspect of the present invention is a disk motor. This disc motor
An output shaft;
A coil disk group comprising a plurality of coil disks on which conductors including a coil pattern are formed;
A commutator disk coaxially bonded to the surface of the coil disk group;
A current supply unit for supplying current to the coil pattern;
A magnetic flux generator facing the coil pattern,
A through-hole penetrating at least two of the commutator disk and the coil disk group is formed, and a conductor of at least two coil disks of the coil disk group and a commutator pattern of the commutator disk are formed through the through hole. It is electrically connected at the position overlapping in the axial direction by the conductor portion provided inside the hole, and rotates integrally with the output shaft,
The current supply unit has a brush in contact with the commutator disk,
The brush slides relatively on the commutator disk with the rotation of the commutator disk and passes over the opening of the through hole .
The third aspect of the present invention is a disk motor. This disc motor
An output shaft;
A coil disk group comprising a plurality of coil disks on which conductors including a coil pattern are formed;
A commutator disk coaxially bonded to the surface of the coil disk group;
A current supply unit for supplying current to the coil pattern;
A magnetic flux generator facing the coil pattern,
A through-hole penetrating at least two of the commutator disk and the coil disk group is formed, and a conductor of at least two coil disks of the coil disk group and a commutator pattern of the commutator disk are formed through the through hole. It is electrically connected at a position overlapping in the axial view by a conductor portion provided so as to fill the inside of the through hole inside the hole, and rotates integrally with the output shaft,
The current supply unit has a brush in contact with the commutator disk,
The brush slides relatively on the commutator disk with the rotation of the commutator disk and passes over the opening of the through hole.

A fourth aspect of the present invention is an electric working machine provided with the disk motor .

  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.

  According to the present invention, a disk motor capable of easily performing electrical connection between coil disks of a coil disk group, and electrical connection between the coil disk group and a commutator disk, and an electric working machine including the disk motor are provided. It is feasible. In the embodiment having the flange, the coil disk or the coil disk group is coaxially bonded on the flange with one surface as an adhesive surface, and the commutator disk is coaxial with the other surface of the coil disk or coil disk group. Therefore, it is possible to realize a disk motor and an electric working machine equipped with the disk motor, in which the electrical connection between the commutator disk and the coil disk is easier than in the case where the flange is sandwiched between the commutator disk and the coil disk. is there.

The perspective view of the brush cutter as an electrically-driven working machine which concerns on embodiment of this invention. FIG. 2 is a front sectional view of a drive unit of the brush cutter shown in FIG. 1. FIG. 3 is a schematic plan view of the stator shown in FIG. 2. The front view of the rotor shown in FIG. The front view which made the support member the cross section of the output shaft and support member shown in FIG. FIG. 5 is an enlarged cross-sectional view of the through hole and its vicinity shown in FIG. 4. FIG. 5 is a plan view of the commutator disk shown in FIG. 4. (A) is a top view of the 1st coil disk shown in FIG. (B) is a bottom view of the coil disk. The coil pattern explanatory drawing of a 1st coil disk. The expanded sectional view of the through-hole at the time of filling the through-hole of embodiment with a conductor regarding a modification, and its vicinity.

  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.

  FIG. 1 is a perspective view of a brush cutter 1 according to an embodiment of the present invention. A brush cutter 1, which is an example of an electric working machine, includes a power supply unit 3, a pipe unit 4, a handle unit 5, a drive unit 6, and a cutting blade 7.

  The power supply unit 3 has a battery 301 as a power source detachable. The pipe unit 4 mechanically connects (links) the power supply unit 3 and the drive unit 6. A wiring (not shown) for electrically connecting the power supply unit 3 and the drive unit 6 is inserted into the pipe unit 4. Power is supplied from the power supply unit 3 to the drive unit 6 by this wiring. The drive unit 6 accommodates a disk motor inside the head housing 61, and rotationally drives the cutting blade 7 with power supplied from the power supply unit 3. The configuration of the disk motor will be described later.

  The handle portion 5 is attached and fixed in the middle of the pipe portion 4, that is, between the power source portion 3 and the drive portion 6. The handle portion 5 is formed by attaching grips 52 to the tips of a pair of arms 51. One grip 52 is provided with a throttle 53. The operator can adjust the power supplied to the drive unit 6 by operating the throttle 53, that is, the rotation speed of the cutting blade 7 can be adjusted. The cutting blade 7 has a substantially disk shape, and a sawtooth is formed on the periphery thereof. In addition, a hole (not shown) is formed at the center of the cutting blade 7 to be attached to an output shaft of a disk motor described later.

  FIG. 2 is a front sectional view of the drive unit 6 of the brush cutter 1 shown in FIG. In addition, as shown in FIG. 2, the extending direction of the output shaft 31 is defined as the up-down direction. The drive unit 6 has a disk motor 80 inside the head housing 61. The head housing 61 is formed by fitting and integrating a cover portion 62 and a base portion 63. The disk motor 80 includes a stator 81, a rotor 82, and a pair of brushes 83. The pair of brushes 83 are provided symmetrically with respect to the rotating shaft (output shaft 31) of the disk motor 80 and are supported by the brush holder 65 of the cover portion 62. Each brush 83 is urged toward the commutator disk 35 (lower side) by a spring 83A so that the lower surface abuts a commutator pattern of a conductor such as copper on the commutator disk 35 described later. The brush 83 is connected to the power supply unit 3 in FIG. 1 and functions as a current supply unit that supplies a current to a coil pattern (to be described later) of the rotor 82.

  The stator 81 includes a magnet 41 as a magnetic flux generator, and an upper yoke 42 and a lower yoke 43 that are soft magnetic bodies. The ring-shaped upper yoke 42 is fixed to the lower surface of the cover portion 62 with, for example, screws 622. The ring-shaped lower yoke 43 having substantially the same diameter as the upper yoke 42 is fixed to the ring-shaped groove 631 formed on the lower surface of the base portion 63 with, for example, a screw 632. The magnet 41 is fitted and fixed in a hole 633 formed on the upper surface of the base portion 63.

  FIG. 3 is a schematic plan view of the stator 81 shown in FIG. As shown in the figure, for example, ten disk-shaped magnets 41 are arranged at an equal angular pitch on the circumference (the holes 633 in FIG. 2 accommodating the magnets 41 are also located on the circumference. The same number exists side by side). The center of the circumference substantially coincides with the rotation center of the disk motor 80. Adjacent magnets 41 have different top magnetic poles. As the magnet 41, a rare earth magnet such as a neodymium magnet is preferable, but a sintered magnet such as a ferrite magnet may be used. The upper yoke 42 and the lower yoke 43 increase the magnetic flux density applied to the coil pattern of the rotor 82 described later.

  As shown in FIG. 2, the rotor 82 includes an output shaft 31 (rotor shaft), a commutator disk 35, a coil portion 36, and a support member 37. The output shaft 31 is rotatably supported by an upper bearing 311 fixed to the cover portion 62 and a lower bearing 312 fixed to the base portion 63. A male screw 31A is formed at the lower end of the output shaft 31, and the cutting blade 7 of FIG. 1 is fixed by a fastener (not shown). The upper surface of the commutator disk 35 is a sliding surface of the brush 83. A current is supplied from the power supply unit 3 shown in FIG. 1 to the coil unit 36 via the brush 83 and the commutator disk 35.

  4 is a front view of the rotor 82 shown in FIG. FIG. 5 is a front view of the output shaft 31 and the support member 37 shown in FIG. As shown in FIG. 5, a support member 37 made of metal such as aluminum, which is coaxially fixed to the output shaft 31, is configured by a substantially cylindrical cylindrical portion 37A and a substantially disc-shaped flange 37B. . The flange 37B protrudes outward from the side surface of the cylindrical portion 37A perpendicularly to the output shaft 31. The predetermined number of air holes 370 penetrates the flange 37B vertically. The operation of the air hole 370 will be described later. As shown in FIG. 4, the coil portion 36 as a coil disk group is bonded and fixed to the upper surface of the flange 37B by a sheet-like adhesive layer 501 having the same shape as the flange 37B in the axial direction.

  The coil portion 36 is formed by laminating a first coil disk 361 to a fourth coil disk 364 with a sheet-like adhesive layer 502 (insulating) interposed therebetween. The sheet-like adhesive layer 502 has the same shape as each coil disk when viewed in the axial direction, and covers substantially the entire surface of each coil disk. The first coil disk 361 to the fourth coil disk 364 have a diameter larger than that of the flange 37B, and a coil pattern to be described later is formed on both surfaces. The commutator disk 35 having the same shape as the flange 37B as viewed in the axial direction is bonded and fixed to the upper surface of the coil portion 36 by a sheet-like adhesive layer 503 having the same shape. The predetermined number of through holes 367 vertically penetrate the commutator disk 35 to the fourth coil disk 364 and communicate with the air holes 370 described above. As shown by arrows in FIG. 4, the through hole 367 and the air hole 370 serve as an air flow path. For this reason, the heat_generation | fever of each layer can be cooled efficiently.

  FIG. 6 is an enlarged cross-sectional view of the through hole 367 shown in FIG. 4 and the vicinity thereof. In addition, illustration of an adhesive layer is abbreviate | omitted in this figure. Conductor lands 381 such as copper are provided on both surfaces around the through hole 367 on each layer substrate (double-sided substrate). In addition, individual through conductors 382 (conductor layers such as copper plating) that connect between the conductor lands 381 on both sides are provided across the conductor lands 381 and the inner surfaces of the through holes 367 (provided before coil disk lamination). Further, an interlayer through conductor 383 (for example, a conductor layer such as copper plating) that connects the individual through conductors 382 is provided across the individual through conductors 382 of each layer. Some of the conductor lands 381 are connected to a circuit pattern (a commutator pattern or a coil pattern described later) on the substrate of each layer. Note that the brush 83 may slide over the opening of the through hole 367 as indicated by a two-dot chain line in FIG.

  FIG. 7 is a plan view of the commutator disk 35 shown in FIG. A through hole 35A at the center of the disc-shaped commutator disk 35 is for inserting the cylindrical portion 37A of FIG. A predetermined number of through holes 35 </ b> B are provided at an equal distance from the center of the commutator disk 35. Some through-holes 35B communicate with through-holes of a coil disk, which will be described later, to form the aforementioned through-holes 367. A commutator pattern 351 formed on the commutator disk 35 is radially divided into 40 segments. Two segments (first, ninth, second, tenth, etc.) with seven segments in between are connected to each other by a connection pattern (not shown) formed on the opposite side of the connection pattern 352 formed on the inside. Connected.

  FIG. 8A is a plan view of the first coil disk 361 shown in FIG. FIG. 8B is a bottom view of the coil disk. Since the other coil disks have the same structure as the first coil disk 361 and have the same coil pattern, only the first coil disk 361 will be described here.

  The first coil disk 361 has coil patterns 92 on both surfaces of a disk-shaped insulating substrate 90 (for example, an insulating resin substrate such as a glass fiber reinforced epoxy resin substrate). The through hole 91 at the center of the insulating substrate 90 is for inserting the cylindrical portion 37A of FIG. Twelve through-holes 367 that connect all the layers are formed, three by three at an angle of 90 ° from the center of the insulating substrate 90. The distances from the through holes 367 to the center of the insulating substrate 90 are equal to each other. Each through hole 367 communicates with one of the through holes 35 </ b> B formed in the commutator disk 35.

  The coil pattern 92 made of copper or other conductive material has 20 partial coil pattern groups 920 each made up of four rows of patterns having substantially the same width close to each other. The partial coil pattern group 920 is formed by sequentially connecting the inner communication pattern group 92A, the radial pattern group 92B, and the outer communication pattern group 92C. The inner side connection pattern groups 92A on both sides are electrically connected to each other through through holes 921 formed in the vicinity of the end portions. The outside contact pattern groups 92C on both sides are electrically connected to each other through through holes 922 formed in the vicinity of the end portions. The radial pattern group 92B extends radially outward from the center side of the insulating substrate 90 and passes the inner contact pattern group 92A and the outer contact pattern group 92C. The radial pattern groups 92B on both sides exist at substantially the same position when viewed in the axial direction. The radial pattern group 92 </ b> B on each surface exists at an equiangular pitch from the center of the insulating substrate 90. The radial pattern group 92B is located directly above the arrangement circumference of the magnets 41 shown in FIGS. 2 and 3 (the circumference around which the centers of the magnets 41 are arranged). That is, the radial pattern group 92 </ b> B passes just above the magnet 41 as each coil disk rotates. A rotational force is obtained by an electromagnetic force between the current flowing through the radial pattern group 92B and the magnetic field generated by the magnet 41.

  FIGS. 9A and 9B are explanatory diagrams of the coil pattern of the first coil disk 361. FIG. These drawings are the same as FIG. 8A and FIG. 8B except for the attached reference numerals. The coil pattern 92 of the first coil disk 361 includes two coils. One coil has a start point A1-1 and an end point A1-2, as shown in FIG. Further, the start point of the other coil is indicated by A2-1, and the end point thereof is indicated by A2-2 in the figure. One coil is connected to the points P11, P11 ′, P12 ′, P12, P13, P13 ′,... P19 ′, P20 ′ from the starting point A1-1. This makes one round clockwise from the starting point A1-1 when viewed from above. Similarly, a total of four turns in the clockwise direction reaches point P50 ′. This time, from point P50 ′ to points P51 ′, P51,... Similarly, the other coil is connected from the start point A2-1 to the end point A2-2.

  The connection relationship between one coil of the first coil disk 361 and the commutator pattern 351 of the commutator board disk 35 is such that the commutator pattern connected to the start point A1-1 is electrically connected to one brush 83. The commutator pattern to which A1-2 is connected is electrically connected to the other brush 83. The same applies to the other coil (start point A2-1, end point A2-2). The same applies to the coils of other coil disks. The coils 83 are energized from the brush 83 through the commutator disk 35 so that the radial pattern group 92B of each coil disk passing over the magnetic pole surface of the magnet 41 generates rotational torque in the same direction.

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

(1) The coil portion 36 is coaxially bonded and fixed on the flange 37B with the lower surface as an adhesive surface (so as to be coaxial with the center of the output shaft 31), and the commutator disk 35 is coaxially bonded to the upper surface of the coil portion 36. Since the laminated structure is fixed, the electrical connection between the commutator disk 35 and the coil part 36 is easier than the structure in which the flange 37B is sandwiched between the commutator disk 35 and the coil part 36, and the cost is reduced. It's cheap. That is, if the structure sandwiches the flange 37B, it is necessary to use, for example, a conductor pin for the electrical connection between the commutator disk 35 and the coil portion 36, so that an extra labor for soldering between the conductor pin and the substrate is required. . Furthermore, the electrical connection between the commutator disk 35 and the coil portion 36 is not easy, for example, it is necessary to provide an insulation pipe for insulation between the conductor pin and the flange 37B. On the other hand, in the present embodiment, because of the laminated structure as described above, the commutator disk 35 and the coil portion 36 can be easily electrically connected using a known interlayer connection technique.

(2) Since the upper surface of the commutator disk 35 communicates with the lower surface of the flange 37B through the through hole 367 and the air hole 370 and air can flow therethrough, the heat dissipation is good and the heat generation of each layer is efficiently cooled. Is possible.

(3) Since there is no object (for example, a pin) protruding from the opening of the through hole 367 onto the commutator disk 35, the brush 83 can slide on the opening of the through hole 367 on the commutator disk 35. For this reason, the brush 83 can be brought closer to the center side of the commutator disk 35, and the outer diameter of the commutator disk 35 can be reduced. Further, since the brush sliding distance is shortened, the friction loss of the brush 83 can be reduced and the life of the brush 83 can be extended.

  The present invention has been described above by taking the embodiment as an example. However, it will be understood by those skilled in the art that various modifications can be made to each component of the embodiment within the scope of the claims. Hereinafter, modifications will be described.

  FIG. 10 is an enlarged cross-sectional view of the through hole 367 and the vicinity thereof when the through hole 367 of the embodiment is filled with the interlayer through conductor 383 regarding the modification. As shown in the figure, the slidability of the brush 83 passing over the opening of the through hole 367 is improved by filling the interlayer through conductor 383 so that the opening of the through hole 367 on the commutator disk 35 is flat. It is possible. Further, the electrical resistance of the interlayer connection can be reduced, and the efficiency is good. Although the configuration of the embodiment is excellent in terms of heat dissipation, this modification is also significant from another viewpoint as described above. When the through hole 367 is filled with the interlayer through conductor 383, the air hole 370 of the flange 37B may not be provided. Further, the interlayer through conductor 383 may be the same as in FIG. 6, and the through hole 367 may be filled by adding another conductor (solder or the like).

  The shape of the coil disk and the commutator disk may not be a strict disk shape, but may be in a range that can be regarded as a substantial circle when viewed in the axial direction.

  The output shaft 31 and the support member 37 may be separate members as shown in the embodiment, or may be integrally formed.

  The flange 37B may have a smaller diameter than that of the commutator disk 35. According to this, the flange 37B can act as positioning of the coil disk and the commutator disk with respect to the output shaft 31. Further, if the diameter is equal to or larger than the distance between the pair of brushes 83, the strength of the rotor 82 can be improved.

  In addition to the above, the number of magnets and their arrangement angle pitch, the number of coil pattern turns (the number of coil pattern rows), the number of coil disk stacks, the number of pin insertion holes and through holes, and other parameters are the required performance. It can be set appropriately according to the cost. Further, the number of turns of the coil pattern may be different for each coil disk. When the coil pattern is one row, the terms “partial coil pattern group”, “inner contact pattern group”, “radial pattern group”, and “outer contact pattern group” in the description of the embodiment are “ Replace with the exception of “group”.

  In addition to the brush cutter shown in the embodiment, the electric working machine may be various electric tools having a rotary drive unit by a disk motor, such as a belt sander or a rotary band saw equipped with a disk motor.

DESCRIPTION OF SYMBOLS 1 Brush cutter 3 Power supply part 4 Pipe part 5 Handle part 6 Drive part 7 Cutting blade 301 Battery 31 Output shaft (rotor shaft)
35 Commutator disk 36 Coil part 37 Support member 37B Flange 41 Magnet 42 Upper yoke 43 Lower yoke 51 Arm 52 Grip 53 Throttle 61 Head housing 62 Cover part 63 Base part 65 Brush holder 80 Disk motor 81 Stator 82 Rotor 83 Brush 92 Coil pattern 92A Inner contact pattern group 92B Radial pattern group 92C Outer contact pattern group 920 Partial coil pattern groups 361 to 364 Coil disks 501 to 503 Adhesive layer

Claims (10)

An output shaft;
A coil disk group comprising a plurality of coil disks on which conductors including a coil pattern are formed;
A commutator disk coaxially bonded to the surface of the coil disk group;
A current supply unit for supplying current to the coil pattern;
A magnetic flux generator facing the coil pattern,
A through-hole penetrating at least two of the commutator disk and the coil disk group is formed, and a conductor of at least two coil disks of the coil disk group and a commutator pattern of the commutator disk are formed through the through hole. A disk motor that is electrically connected at a position overlapping in an axial view by a conductor portion that is continuously provided in the axial direction inside the hole, and that rotates together with the output shaft.   2. The disk motor according to claim 1, wherein the through hole penetrates the commutator disk and the coil disk group, and the conductor portion is provided to penetrate the commutator disk and the coil disk group. A flange provided integrally with the output shaft;
The coil disk group is coaxially bonded on the flange with one surface as an adhesive surface,
The disk motor according to claim 1, wherein the commutator disk is coaxially bonded to the other surface of the coil disk group.   The disk motor according to claim 3, wherein the flange is substantially the same size as the commutator disk when viewed in the axial direction. The conductor portion is a conductor film formed on the inner surface of the through hole,
An air hole communicating with the through hole and penetrating the flange is formed,
The disk motor according to claim 3 or 4, wherein gas can pass through the through hole and the air hole.   The disk motor according to claim 2, wherein the conductor portion fills the inside of the through hole. The current supply unit has a brush in contact with the commutator disk,
The disk motor according to claim 2, wherein the brush slides relatively on the commutator disk with the rotation of the commutator disk and passes over the opening of the through hole. An output shaft;
A coil disk group comprising a plurality of coil disks on which conductors including a coil pattern are formed;
A commutator disk coaxially bonded to the surface of the coil disk group;
A current supply unit for supplying current to the coil pattern;
A magnetic flux generator facing the coil pattern,
A through-hole penetrating at least two of the commutator disk and the coil disk group is formed, and a conductor of at least two coil disks of the coil disk group and a commutator pattern of the commutator disk are formed through the through hole. It is electrically connected at the position overlapping in the axial direction by the conductor portion provided inside the hole, and rotates integrally with the output shaft,
The current supply unit has a brush in contact with the commutator disk,
The brush slides relatively on the commutator disk with the rotation of the commutator disk and passes over the opening of the through hole.
A disc motor characterized by that. An output shaft;
A coil disk group comprising a plurality of coil disks on which conductors including a coil pattern are formed;
A commutator disk coaxially bonded to the surface of the coil disk group;
A current supply unit for supplying current to the coil pattern;
A magnetic flux generator facing the coil pattern,
A through-hole penetrating at least two of the commutator disk and the coil disk group is formed, and a conductor of at least two coil disks of the coil disk group and a commutator pattern of the commutator disk are formed through the through hole. It is electrically connected at a position overlapping in the axial view by a conductor portion provided so as to fill the inside of the through hole inside the hole, and rotates integrally with the output shaft,
The current supply unit has a brush in contact with the commutator disk,
The brush slides relatively on the commutator disk with the rotation of the commutator disk and passes over the opening of the through hole.
A disc motor characterized by that.   An electric working machine comprising the disk motor according to any one of claims 1 to 9.