JP2013017312A - Disk motor and electric operating machine having the same - Google Patents

Abstract

A disk motor with improved assembly work efficiency and an electric working machine including the same are provided.
An output shaft, a rotor disk fixed to the output shaft, a stator including a magnetic flux generating section that generates a magnetic flux with respect to the rotor disk, and the rotor disk are located inside the output shaft. The stator 40 has an annular yoke 42 that faces one surface of the rotor disk 36. A convex portion 622 is provided on the inner surface of the housing, a concave portion 422 is provided on the yoke 42, and the convex portion 622 is positioned in the concave portion 422 so that the position of the yoke 42 in the rotational direction relative to the housing 61 is determined.
[Selection] Figure 2

Description

  The present invention relates to a disk motor and an electric working machine including the same.

  A general disk motor outputs a rotational force by a rotor coil substrate having a coil pattern printed on a substrate, a rotating shaft that holds the rotor coil substrate, and a magnetic field applied to the rotor coil substrate. Compared to a motor manufactured by winding a copper wire around a magnetic core as a rotor, it is lightweight, low noise, low vibration and high efficiency.

  A stator of a disk motor uses a soft magnetic yoke together with a permanent magnet (or electromagnet), and conventionally uses fastening parts such as screws to fix the yoke to the head housing. However, since the fastening parts are used, the assembly work efficiency is lowered.

2011-97882 gazette

  In the conventional disk motor configuration, a fastening part is used to fix the yoke to the head housing. As a result, the number of assembling processes has increased and efficiency has been reduced. Since the rotor rotates at a high speed (5000 rpm to 10,000 rpm) and the yoke is close to the rotor (about 0.5 mm), strong fixation is required. If the yoke is displaced in the direction of the rotation axis, it will interfere with the rotor and cause a failure. When the yoke rotates in the rotation direction of the rotor, useless energy loss and vibration increase.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a disk motor that can position a yoke with a simple configuration and improve the efficiency of assembly work, and an electric working machine including the same. It is in.

The first aspect of the present invention is a disk motor. This disc motor
An output shaft;
A rotor disk fixed to the output shaft;
A stator including a magnetic flux generator for generating magnetic flux with respect to the rotor disk;
A housing in which the rotor disk is located inside and rotatably supports the output shaft;
The stator has an annular yoke facing one surface of the rotor disk,
A convex portion is provided on one of the inner surface of the housing or the annular yoke, and a concave portion or a hole is provided on the other. The convex portion is located in the concave portion or the hole, and the position of the annular yoke in the rotational direction with respect to the housing. It is a structure that is determined.

  In the disk motor, the housing may include a cover portion and a base portion, and at least a part of the annular yoke may be held between the cover portion and the base portion.

  In the disk motor, it is preferable that the annular yoke has an extending portion extending in a radial direction, and the recessed portion or the hole is provided in the extending portion.

In the disk motor, the stator has a plurality of through holes and an annular coil substrate that generates a magnetic flux passing through the plurality of through holes, and a magnet that is integrated with the annular yoke and protrudes into the through holes. With a core,
The annular coil substrate is located between the annular yoke and the rotor disk;
A convex portion is provided on one of the inner surface of the housing or the annular coil substrate, and a concave portion or a hole portion is provided on the other, and the convex portion is located in the concave portion or the hole portion and the rotation direction of the annular coil substrate with respect to the housing It is preferable that the position of the is determined. In this case, the housing may include a cover portion and a base portion, and at least a part of the annular yoke and the annular coil substrate may be held between the cover portion and the base portion. Furthermore, it is preferable that the annular yoke and the annular coil substrate respectively have extensions extending in the radial direction, and the recesses or holes are provided in the extensions.

  In the disk motor, it is preferable that the convex portions and the sets of concave portions or hole portions corresponding to the convex portions are arranged at intervals other than equal intervals.

  A second aspect of the present invention is an electric working machine including 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.

  ADVANTAGE OF THE INVENTION According to this invention, the disk motor which improved the assembly work efficiency, and an electric working machine carrying this can be implement | achieved.

The perspective view of the brush cutter as an electrically-driven working machine provided with the disk motor which concerns on embodiment of this invention. FIG. 2 is a front sectional view of a drive unit including a disk motor of the brush cutter shown in FIG. 1. The bottom view by the side of the cover part in the head housing of a drive part. The top view of the base part side of a head housing. Sectional drawing which expands and shows the positioning structure of the annular yoke in a head housing. FIG. 3 is a plan view of the commutator disk shown in FIG. 2. (A) is a top view of the coil disk used for the rotor disk of FIG. (B) is a bottom view of the coil disk. FIG. 10 is a front sectional view of a driving unit of a brush cutter using a yoke provided with a magnetic core portion as a stator and a stator coil substrate according to another embodiment of the present invention. The bottom view by the side of the cover part in the head housing of the drive part of FIG. The top view by the side of the base part in the head housing of the drive part of FIG. The exploded perspective view of the yoke which provided the magnetic core part, and a stator coil board | substrate. The fragmentary sectional view which shows the modification 1 of the positioning structure of an annular yoke. The fragmentary sectional view which shows the modification 2 of the positioning structure of an annular yoke. The fragmentary sectional view which shows the modification 3 of the positioning structure of an annular yoke.

  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, process, 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 mowing operation is performed by the cutting blade 7 attached to the drive unit 6.

  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. In addition, wiring (such as the power cable 34 in FIG. 2) that electrically connects 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. 1 (however, the cross section is taken along the line II-II in FIG. 3). 3 is a bottom view of the cover portion side of the head housing 61, and FIG. 4 is a plan view of the base portion side. 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 includes a disk motor 10 inside the head housing 61. The head housing 61 is integrated by combining (fitting) the cover part 62 and the base part 63 with each other, and screwing the screw into the female screw hole 625 of the cover part 62 from the mounting hole 635 side of the base part 63. The

  The disk motor 10 includes a stator 40, a rotor 30, and a pair of brushes 83. The pair of brushes 83 are provided symmetrically with respect to the output shaft 31 (rotary shaft) of the disk motor 10 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 via a power supply cable 34 provided in the cover unit 12, and functions as a current supply unit that supplies current to a coil pattern (described later) of the rotor 30.

  The stator 40 includes a permanent magnet 41 as a magnetic flux generation unit, and an upper annular yoke 42 and a lower annular yoke 43 that are soft magnetic bodies.

  The upper annular yoke 42 is conventionally fixed to the cover portion 62 using screws, but in the present embodiment, the upper annular yoke 42 is attached to the head housing 6 without using screws in order to improve assembly workability. It is structured to be positioned and held. That is, as shown in FIG. 3, extended portions 421 extending in the radial direction of the yoke 42 from the outer circumference of the annular portion in the upper annular yoke 42 are formed at a plurality of locations, and rectangular concave portions 422 are formed in the radial direction here. Keep it. On the other hand, the convex part 622 is formed in the part which touches the recessed part 422 of the cover part 62. FIG. The concave portion 422 and the convex portion 622 are mutually fitted when the yoke 42 is mounted on the cover portion 62 to form a rotational positioning structure, and prevent the upper annular yoke 42 from rotating in the circumferential direction of the disk motor 10. .

  As shown in FIGS. 4 and 5, an annular rib 636 is formed slightly inside the outer edge portion of the base portion 63, and the inner side of the outer edge portion 626 of the cover portion 62 that fits outside the annular rib 636. A step portion 627 having a height lower than that of the outer edge portion 626 is formed. The extension portion 421 of the upper annular yoke 42 is sandwiched between the step portion 627 of the cover portion 62 and the annular rib 636 of the base portion 63, so that the axial direction of the disk motor 10 (output shaft) of the upper annular yoke 42 is increased. Displacement in the direction 31) is prevented.

  The lower annular yoke 43 having substantially the same diameter as the upper annular yoke 42 is fixed, for example, with a screw or the like in an annular groove 631 formed on the lower surface of the base 63 shown in FIG. The upper annular yoke 42 and the lower annular yoke 43 are produced by punching a soft magnetic plate such as iron.

  As shown in FIG. 4, the disk-shaped permanent magnet 41 is fitted and fixed in a hole 633 formed on the upper surface of the base 63, and, for example, 10 pieces are arranged side by side at an equiangular pitch on the circumference. The The center of the circumference substantially coincides with the rotation center of the disk motor 10. Adjacent permanent magnets 41 have different top magnetic poles. As the permanent 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 annular yoke 42 and the lower annular yoke 43 increase the magnetic flux density applied to the coil pattern of the rotor 30 described later.

  As shown in FIG. 2, the rotor 30 includes an output shaft 31 (rotor shaft), a substantially disc-shaped commutator disc 35, and a substantially disc-shaped rotor disc 36. The output shaft 31 passes through the commutator disk 35 and the rotor disk 36, and the commutator disk 35 and the rotor disk 36 are coaxially fixed to the output shaft 31 (the shaft cores coincide with each other). . The output shaft 31 is fixed to an upper bearing 311 fixed to a cover portion 62 that exists mainly on one surface side of the rotor disk 36 and a base portion 63 that mainly exists on the other surface side of the rotor disk 36. The lower bearing 312 is rotatably supported. 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 rotor disk 36 via the power cable 34, the brush 83 and the commutator disk 35.

  The rotor disk 36 is composed of a single coil disk 361 shown in FIG. 7, or a plurality of coil disks 361 laminated with a sheet-like insulating adhesive layer sandwiched between them. FIG. An example of the front side coil pattern of the disk 361 and an example of the back side coil pattern of the coil disk 361 are shown in FIG.

  The 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 intermediate portion of the output shaft 31. 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 35B formed in the commutator disk 35 of FIG.

  The coil pattern 92 made of a conductive material such as copper has 20 partial coil pattern groups 920 each consisting of four rows of partial coil patterns of substantially the same width close to each other on one side (one layer) of the insulating substrate 90. 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 92B is located directly above the circumference of the permanent magnets 41 shown in FIGS. 2 and 4 (the circumference around which the centers of the permanent magnets 41 are arranged). That is, the radial pattern group 92 </ b> B passes immediately above the permanent magnet 41 as the coil disk 361 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 permanent magnet 41.

  FIG. 6 is a plan view of a commutator disk 35 that is integrated with the rotor disk 36 with the flange portion 32 of the output shaft 31 interposed therebetween. The through hole 35A in the center of the commutator disk 35 is a portion into which the intermediate part of the output shaft 31 is fitted, and a predetermined number of pin insertion holes 35B are provided at equal distances from the center of the commutator disk 35, and are not shown in the figure. The pins are selectively inserted into a part of the pin insertion holes 35B and the through holes 367 of the coil disk 361, whereby a predetermined coil pattern 92 of the rotor disk 36 and a commutator pattern 351 (part where the brush 83 is in contact). ) Is electrically connected to a predetermined segment. Here, the commutator pattern 351 of 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. It is connected.

  As a result, when power is supplied to the commutator pattern 351 through the path of the power supply unit 3, the feeding cable 34, and the brush 83, the electromagnetic force between the permanent magnet 41 and the radial pattern group 92 </ b> B that is selectively energized. The disk motor 10 continues to generate rotational torque.

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

(1) Since the concave portion 422 is provided in the radial extension portion 421 of the upper annular yoke 42 and the convex portion 622 is provided in the cover portion 62 of the head housing 6, when the yoke 42 is attached to the cover portion 62, The concave portion 422 and the convex portion 622 are fitted, and positioning of the yoke 42 in the rotational direction with respect to the head housing 6 is possible.

(2) When the cover part 62 and the base part 63 of the head housing 6 are combined, the extension part 421 of the upper annular yoke 42 is connected to the step part 627 of the cover part 62 and the circle of the base part 63 as shown in FIG. By being sandwiched between the annular ribs 636, the upper annular yoke 42 can be prevented from being displaced in the axial direction of the disk motor 10.

(3) Accordingly, the upper annular yoke 42 can be positioned and fixed to the head housing 6 without using a fastening part such as a screw, and assembling workability can be improved.

(4) Further, the set of the convex portion 622 and the concave portion 422 fitted to the convex portion 622 are arranged at intervals other than equal intervals, so that the upper annular yoke 42 is positioned at a position in the rotational direction that is reliably determined. It can be fixed to the housing 6.

  FIG. 8 is another embodiment of a disk motor included in the drive unit 6 of the brush cutter 1 shown in FIG. 1, and is a front sectional view of an example in which an electromagnet is used instead of a permanent magnet as the stator 40 (however, The cross section is taken along the line VIII-VII in FIG. 9). 9 is a bottom view of the head housing 61 on the cover side, and FIG. 10 is a plan view of the base side. In addition, as shown in FIG. 8, the extending direction of the output shaft 31 is defined as the up-down direction.

  In this case, the magnetic core portion 427 is integrally provided on the lower surface (the rotor facing surface) of the upper annular yoke 42 so as to protrude downward at equal angular intervals. The upper annular yoke 42 and the magnetic core portion 427 are preferably integrally formed of the same soft magnetic material. The stator coil substrate 100 is annular and has the same contour as the upper annular yoke 42 as shown in FIG. 11, for example, and an extension 101 extending in the radial direction of the coil substrate 100 from the outer circumference of the annular portion of the coil substrate 100. And a rectangular recess 102 is formed in the radial direction. The coil substrate 100 is provided with a through hole 103 that penetrates the magnetic core portion 427, and a coil pattern 104 made of a conductive material such as copper that circulates around the magnetic core portion 427 is provided around the through hole 103. Yes. Each coil pattern 104 is connected in series or in parallel to each other, receives power supply from the power supply cable 34, and generates a magnetic flux in a direction penetrating the through hole 103. That is, the magnetic poles of the electromagnet are formed on the surface of the magnetic core portion 427 facing the rotor disk 36. Adjacent magnetic poles have opposite polarities.

  On the other hand, the convex part 622 is formed in the part which touches the recessed parts 102 and 422 of the cover part 62. Therefore, when the upper annular yoke 42 and the coil substrate 100 are sequentially mounted on the cover portion 62, the concave portions 102, 422 and the convex portion 622 are fitted to each other to form a positioning structure in the rotational direction. None, the upper annular yoke 42 and the coil substrate 100 are prevented from rotating in the circumferential direction of the disk motor 10. Only the lower annular yoke 43 is fixed to the base portion 63 as a constituent member of the stator 40.

  When the cover part 62 and the base part 63 are combined and integrated, the extension part 421 of the upper annular yoke 42 and the extension part 101 of the coil substrate 100 are connected to the step part 627 of the cover part 62 and the ring of the base part 63. By being sandwiched between the ribs 636, displacement of the upper annular yoke 42 and the coil substrate 100 overlapping therewith in the axial direction of the disk motor 10 is prevented.

  In the present embodiment, the configuration other than the configuration of the stator 40 may be the same as in FIG.

  According to such a configuration, the stator coil substrate 100 of the disk motor 10 using the electromagnet for the stator 40 and the yoke 42 can be fixed with a simple structure without using fastening parts such as screws, and the assembly work efficiency can be improved. It is possible to improve.

  Further, the set of the convex portion 622 and the concave portions 102 and 422 corresponding to the convex portion 622 are arranged at intervals other than equal intervals, so that the upper annular yoke 42 and the stator coil substrate 100 are reliably determined in the rotation direction. It can fix to the head housing 6 in the position. If the convex portion 622 and the pair of concave portions 102 and 422 corresponding to the convex portion 622 are installed at a position rotated by 90 degrees, the stator coil substrate 100 and the upper annular yoke 42 are moved relative to the normal mounting position during assembly. There is a possibility to rotate 90 degrees. In that case, the state of the magnetic field changes from the optimal state, and the rotational performance of the disk motor 10 changes greatly.

  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.

  In Modification 1 of FIG. 12, the outer periphery of the upper annular yoke 42 is extended in the radial direction as a whole, a part of the extended portion is cut out to form a rectangular concave portion 422 in the radial direction, and the concave portion of the cover portion 62 is formed. A convex portion 622 is formed in a portion in contact with 422. The concave portion 422 and the convex portion 622 are mutually fitted when the yoke 42 is attached to the cover portion 62 to form a rotational positioning structure, and prevent the upper annular yoke 42 from rotating in the circumferential direction of the disk motor. In this case, since the outer periphery of the upper annular yoke 42 is extended in the radial direction as a whole, a region sandwiched between the cover portion 62 and the base portion is widened to prevent the upper annular yoke 42 from rotating in the circumferential direction. It is possible to make the effect stronger.

  In the second modification of FIG. 13, a rectangular convex portion 423 extending in the radial direction of the yoke 42 is formed from the outer circumference of the annular portion of the upper annular yoke 42, while the cover portion 62 is in contact with the convex portion 423. A recess 623 is formed. The convex portion 423 and the convex portion 623 are engaged with each other when the yoke 42 is mounted on the cover portion 62 to form a rotational positioning structure, and prevent the upper annular yoke 42 from rotating in the circumferential direction of the disk motor. .

  In Modification 3 of FIG. 14, an extension 421 extending in the radial direction of the yoke 42 from the outer circumference of the annular portion of the upper annular yoke 42 is formed, and for example, a circular hole 424 is formed therein. On the other hand, a columnar convex portion 624 is formed at a portion in contact with the hole portion 424 of the cover portion 62. The hole portion 424 and the convex portion 624 are mutually fitted when the yoke 42 is attached to the cover portion 62 to form a positioning structure in the rotational direction, and prevent the upper annular yoke 42 from rotating in the circumferential direction of the disk motor. .

  It is obvious that the configurations of the first to third modifications of FIGS. 12 to 14 can be similarly applied when the stator coil substrate 100 is used while being superimposed on the upper annular yoke 42.

  Further, if the position of the upper annular yoke and the stator coil substrate in the rotational direction is determined with respect to the housing, a convex portion is provided on one of the inner surface of the housing or the annular yoke, and a concave portion corresponding to the convex portion on the other side. Or the hole part should just be provided, and the shape of those convex parts, a recessed part, and a hole part is arbitrary.

  As shown in FIGS. 8 to 11, when an electromagnet is used for the stator 40, a brushless motor in which a permanent magnet is arranged on the rotor disk 36 side is also possible.

  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
DESCRIPTION OF SYMBOLS 10 Disc motor 30 Rotor 31 Output shaft 34 Feed cable 35 Commutator board 36 Rotor disk 40 Stator 41 Permanent magnet 42 Upper annular yoke 43 Lower annular yoke 61 Head housing 62 Cover part 63 Base part 83 Brush 100 Stator coil board 101,421 Extension part 102,422,623 Concave part 423,622,624 Convex part 424 Hole part 427 Magnetic core part 627 Step part
636 Annular Rib

Claims (8)

An output shaft;
A rotor disk fixed to the output shaft;
A stator including a magnetic flux generator for generating magnetic flux with respect to the rotor disk;
A housing in which the rotor disk is located inside and rotatably supports the output shaft;
The stator has an annular yoke facing one surface of the rotor disk,
A convex portion is provided on one of the inner surface of the housing or the annular yoke, and a concave portion or a hole is provided on the other. The convex portion is located in the concave portion or the hole, and the position of the annular yoke in the rotational direction with respect to the housing. A disk motor that has a fixed structure.   The disk motor according to claim 1, wherein the housing has a cover portion and a base portion, and at least a part of the annular yoke is held between the cover portion and the base portion.   The disk motor according to claim 1, wherein the annular yoke has an extending portion extending in a radial direction, and the recessed portion or the hole is provided in the extending portion. The stator includes an annular coil substrate that has a plurality of through holes and generates a magnetic flux penetrating the plurality of through holes, and a magnetic core portion that is integrated with the annular yoke and protrudes into the through hole. ,
The annular coil substrate is located between the annular yoke and the rotor disk;
A convex portion is provided on one of the inner surface of the housing or the annular coil substrate, and a concave portion or a hole portion is provided on the other, and the convex portion is located in the concave portion or the hole portion and the rotation direction of the annular coil substrate with respect to the housing The disk motor according to claim 1, wherein the position is determined.   The disk according to claim 4, wherein the housing has a cover part and a base part, and at least a part of the annular yoke and the annular coil substrate is held between the cover part and the base part. motor.   6. The disk motor according to claim 4, wherein each of the annular yoke and the annular coil substrate has an extending portion extending in a radial direction, and the recessed portion or the hole is provided in the extending portion.   The disk motor according to any one of claims 1 to 6, wherein the convex portions and the sets of the concave portions or the hole portions corresponding to the convex portions are arranged at intervals other than equal intervals.   An electric working machine comprising the disk motor according to any one of claims 1 to 7.