JP6569456B2 - motor - Google Patents

Description

  The present invention relates to a motor including a conductive plate for preventing electric corrosion generated in a bearing.

  As a conventional motor, an inner rotor type motor in which a rotor is rotatably disposed inside a stator is known. As this type of motor, for example, there is a brushless DC motor for rotationally driving a blower fan mounted on an outdoor unit of an air conditioner.

  This brushless DC motor supports a cylindrical stator covered with a motor outer made of resin, a rotor having a rotation shaft and disposed on the inner peripheral side of the stator, and an output side of the rotation shaft of the rotor. An output-side bearing, a non-output-side bearing that supports the non-output side of the rotor rotation shaft, a metal output-side bracket disposed on the motor outer shell on the output side of the rotor rotation shaft, and a counter-rotation of the rotor rotation shaft And a metal non-output side bracket disposed on the motor outer shell on the output side.

  On the outer peripheral surface of the motor outer shell, a small diameter portion is formed on the output side of the rotor rotation shaft, and a large diameter portion having a diameter larger than that of the small diameter portion is formed on the opposite output side of the rotor rotation shaft. The boundary is a step. The output side bracket has an output side bearing house for accommodating the output side bearing, and a flange portion extending around the output side bearing house. The flange portion of the output side bracket is covered with resin and integrated with the motor outer shell.

  On the other hand, the non-output side bracket includes a cylindrical anti-output side bracket body portion having a bottom surface, an anti-output side bearing house provided on the bottom surface for accommodating the anti-output side bearing, and an anti-output side bracket body portion. An annular non-output side bracket flange formed outward from the peripheral edge of the opening and a plurality of claw portions projecting outward from the outer peripheral edge of the anti-output side bracket flange. The non-output-side bracket main body portion of the non-output-side bracket is press-fitted into the large-diameter portion of the outer peripheral surface of the motor outer shell. The output side bearing is housed in the output side bearing house provided in the output side bracket, and the non-output side bearing is housed in the output side bearing house provided in the anti-output side bracket. Are electrically connected to each other.

  The brushless DC motor further includes a non-output-side bracket press-fitted into the motor outer shell and a fixing bracket for strengthening the fixing of the motor outer shell. The fixing bracket includes a cylindrical fixing bracket main body, an annular fixing bracket flange formed outwardly from a peripheral edge of one opening of the fixing bracket main body part, and a peripheral edge of the other opening. Is provided with a locking portion that is folded back inward.

  When this fixing bracket is attached to the motor shell, the fixing bracket covers the large-diameter portion of the outer peripheral surface of the motor shell from the output side of the rotor rotating shaft, starting from the side where the fixing bracket flange is provided. Attach the bracket flange for fixing and the non-output side bracket flange. At this time, the locking portion provided on the fixing bracket is locked to the step portion of the motor outer shell. Thereafter, the plurality of claw portions provided on the non-output-side bracket flange are folded back to the fixing bracket flange side. As a result, the fixing bracket and the non-output side bracket are connected and the locking portion of the fixing bracket is locked to the stepped portion of the motor outline, so that the non-output side bracket is placed on the non-output side of the rotating shaft of the rotor. Prevents slipping out and strengthens the fixing of the motor outer shell and the non-output side bracket press-fitted into the motor outer shell.

  In such a brushless DC motor, since the output side bracket and the non-output side bracket are not electrically connected, a potential difference is generated between the output side bearing and the non-output side bearing. There was a problem that electric corrosion occurred on the side bearing. In order to prevent this electric corrosion, the output side bracket and the anti-output side bracket are connected by a conductive conductive plate to eliminate the potential difference between the output side bearing and the anti-output side bearing that causes electric corrosion. Is known (see, for example, Patent Document 1).

  The output side bracket has a cylindrical output side bracket main body having a bottom surface and an output side bearing house provided on the bottom surface for accommodating the output side bearing. The output side bracket main body of the output side bracket is press-fitted into the outer peripheral surface of the motor outer shell. On the other hand, the non-output side bracket has an anti-output side bearing house for accommodating the non-output side bearing house, and a flange portion extending around the anti-output side bearing house. The flange portion of the non-output side bracket is covered with resin and integrated with the motor outer shell.

  The conduction plate includes a plate-like conduction band, a ring-shaped end provided at one end of the conduction band, and a joint end provided at the other end of the conduction band. The ring-shaped end portion is press-fitted into the non-output side bearing house of the non-output side bracket, and the joint end portion is held on the inner peripheral side of the output side bracket main body portion of the output side bracket. In the conductive plate configured in this manner, the joint end is sandwiched between the inner peripheral side of the output side bracket main body of the output side bracket, and therefore, the outer peripheral surface of the motor outer shell is provided with a groove portion where the joint end is sandwiched. It was necessary to form, and it was necessary to form the shape of the joining end portion along the outer peripheral surface of the motor outer shell. Therefore, in the brushless DC motor including the conductive plate disclosed in Patent Document 1, the output side bracket and the non-output side bracket are connected to each other. There was a problem that became.

Japanese Patent No. 574127

  In view of the above problems, the present invention can attach a conductive plate for preventing electrolytic corrosion generated in the bearing from the outside of the motor shell, and can make the shape of each of the motor shell and the conductive plate simple. The purpose is to provide.

  In order to solve the above-mentioned problems, a motor according to the present invention includes a cylindrical stator covered with a motor outer formed of resin, a rotor having a rotation shaft and disposed on the inner peripheral side of the stator, An output-side bearing that supports the output side of the rotating shaft, a non-output-side bearing that supports the non-output side of the rotating shaft of the rotor, and a metal output-side bracket that is disposed on the motor outer shell on the output side of the rotating shaft of the rotor And an anti-output-side bracket made of metal disposed on the outer side of the motor on the non-output side of the rotating shaft of the rotor, and the output-side bracket includes an output-side bearing house for accommodating the output-side bearing, and an output-side bearing Cylindrical anti-output side bracket that has a flange portion that extends around the house and is integrated with the motor outer shell, and the non-output side bracket has a bottom surface that is press-fitted into the outer peripheral surface of the motor outer shell. A body part, an anti-output side bearing house for accommodating the anti-output side bearing provided on the bottom surface, an anti-output side bracket flange formed outward from the peripheral edge of the opening of the anti-output side bracket body part, A motor having a claw that protrudes outward from the outer edge of the non-output side bracket flange, and is joined to a plate-like conduction band and an output side bearing house of the output side bracket provided at one end of the conduction band. In addition, a conductive plate having conductivity is provided which includes a first joint portion and a second joint portion provided at the other end of the conduction band and sandwiched between a claw portion and a non-output-side bracket flange. .

  According to the motor of the present invention, it is possible to attach a conductive plate for preventing electrolytic corrosion generated in the bearing from the outside of the motor outer shell, and the shapes of the motor outer shell and the conductive plate can be simplified.

FIG. 5 is a front view showing a state before the fixing bracket flange and the non-output side bracket flange are brought into contact with each other in the motor of the present invention, and a plurality of claws of the non-output side bracket flange are crimped. FIG. 6 is a side view showing a state before the fixing bracket flange and the non-output side bracket flange are brought into contact with each other in the motor of the present invention, and a plurality of claws of the non-output side bracket flange are crimped. It is a front view which shows the state after making the bracket bracket for fixation and the non-output side bracket flange contact | abut in the motor of this invention, and the several nail | claw part of the non-output side bracket flange was crimped. FIG. 6 is a side view showing a state after the fixing bracket flange and the non-output side bracket flange are brought into contact with each other in the motor of the present invention and a plurality of claw portions of the non-output side bracket flange are crimped. It is a schematic sectional drawing which shows the AA cross section shown in FIG. 3 in the motor of this invention. It is explanatory drawing which shows the conduction | electrical_connection board which has to the motor of this invention, (a) is a side view, (b) is a front view, (c) is a fragmentary sectional view which shows the BB cross section shown in (b), ) Is a partially enlarged view of (b). It is an enlarged view which shows the vicinity of the 1st junction part with which the conduction plate which the motor of this invention has was equipped, (a) is the elements on larger scale of FIG. 3, (b) is the elements on larger scale of FIG. It is an enlarged view which shows the vicinity of the 2nd junction part with which the conduction plate which the motor of this invention has was equipped, (a) is the elements on larger scale of FIG. 5, (b) is the elements on larger scale of FIG.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 8 are diagrams illustrating the configuration of the motor M in the present embodiment. As shown in FIGS. 1 to 5, the motor M is applied to, for example, a brushless DC motor for rotationally driving a blower fan mounted on an outdoor unit of an air conditioner. 2, an output-side bearing 31, an anti-output-side bearing 32, an output-side bracket 41, an anti-output-side bracket 42, a fixing bracket 43, and a conduction plate 5.

  The stator 1 includes a stator core 13 having a cylindrical yoke portion and a plurality of teeth portions extending from the yoke portion toward the inner diameter side, and a winding 12 is wound around the teeth portion via an insulator 11. The stator 1 is covered with a motor shell 6 made of resin except for the inner peripheral surface of the stator core 13. The rotor 2 has a rotating shaft 21 and a plurality of permanent magnets (not shown), and the permanent magnets are integrally formed around the rotating shaft 21 so that N poles and S poles appear alternately at equal intervals. Has been. The rotor 2 is rotatably arranged with a predetermined gap (gap) on the inner peripheral side of the stator core 13 of the stator 1. The output side bearing 31 supports the output side (side to which the blower fan is connected) of the rotating shaft 21 of the rotor 2. The counter-output side bearing 32 supports the counter-output side of the rotating shaft 21 of the rotor 2. As the output side bearing 31 and the non-output side bearing 32, for example, ball bearings are used.

  The output side bracket 41 is made of metal (such as a steel plate or aluminum) and is disposed on the motor outer shell 6 on the output side of the rotating shaft 21 of the rotor 2. The output side bracket 41 includes an output side bearing house 411 for accommodating the output side bearing 31 and a flange portion 412 that extends around the output side bearing house 411. The flange portion 412 of the output side bracket 41 is covered with resin and integrated with the motor outer shell 6. The output side bearing house 411 is formed in a cylindrical shape having a bottom surface, has a hole in the center of the bottom surface, and the output side of the rotary shaft 21 protrudes from the hole. A conduction plate 5 described later is joined to the outer peripheral surface of the output side bearing house 411.

  On the other hand, the non-output side bracket 42 is made of metal (such as a steel plate or aluminum) and is disposed on the motor outer shell 6 on the counter output side of the rotating shaft 21 of the rotor 2. The non-output-side bracket 42 includes a cylindrical anti-output-side bracket main body 421 having a bottom surface, an anti-output-side bearing house 422 provided on the bottom surface for accommodating the anti-output-side bearing 32, and an anti-output-side bracket main body portion. An annular anti-output side bracket flange 423 formed outward from the peripheral edge of the opening 424 of 421, and a plurality of claws 425a to 425h protruding outward from the outer peripheral edge of the anti-output side bracket flange 423 Have The non-output-side bracket main body 421 of the non-output-side bracket 42 is press-fitted into a large-diameter portion 62 on the outer peripheral surface of the motor outer shell 6 to be described later. As shown in FIGS. 1 and 2, the plurality of claw portions 425 a to 425 h provided on the non-output-side bracket flange 423 are in a state of protruding to the output side of the rotating shaft 21.

  The output side bearing 31 is accommodated in an output side bearing house 411 provided in the output side bracket 41, and the non-output side bearing 32 is accommodated in an anti-output side bearing house 422 provided in the anti-output side bracket 42. The output-side bearing 31 and the output-side bearing house 411 are electrically connected to the anti-output-side bearing 32 and the anti-output-side bearing house 422, respectively.

  On the outer peripheral surface of the motor outer shell 6, a small diameter portion 61 is formed on the output side of the rotary shaft 21 of the rotor 2, and a large diameter portion 62 having a diameter larger than that of the small diameter portion 61 is formed on the opposite output side of the rotary shaft 21 of the rotor 2. The boundary between the small diameter portion 61 and the large diameter portion 62 is a stepped portion 63.

  Further, the motor M includes a non-output side bracket 42 press-fitted into the outer peripheral surface of the motor outer shell 6 and a fixing bracket 43 for strengthening the fixing of the motor outer shell 6. The fixing bracket 43 includes a cylindrical fixing bracket main body 431, an annular fixing bracket flange 432 formed outward from the periphery of one opening 434 of the fixing bracket main body 431, The other opening 435 is provided with a locking portion 433 that is folded back inward.

  When the fixing bracket 43 is attached to the motor outer shell 6, as shown in FIGS. 1, 2, and 5, the fixing bracket 43 is attached to the rotor 2 with the fixing bracket flange 432 provided first. The fixing bracket flange 432 and the non-output-side bracket flange 423 are brought into contact with each other so as to cover the outer peripheral surface of the motor outer shell 6 from the output side of the rotary shaft 21. At this time, the locking portion 433 provided on the fixing bracket 43 is locked to the stepped portion 63 of the motor outer shell 6. The plurality of claw portions 425 provided on the non-output-side bracket flange 423 are in a state of protruding to the output side of the rotary shaft 21.

  Thereafter, as shown in FIGS. 3, 4, and 5, the plurality of claw portions 425 a to 425 h provided on the non-output-side bracket flange 423 are folded back toward the fixing bracket flange 432. The plurality of claw portions 425 a to 425 h provided on the non-output-side bracket flange 423 are in a state of being crimped to the fixing bracket flange 432. In other words, the plurality of claw portions 425 a to 425 h are in a state where the fixing bracket flange 423 is sandwiched between the non-output-side bracket flange 423.

  As a result, the fixing bracket 43 and the non-output side bracket 42 are fixed, and the locking portion 433 of the fixing bracket 43 is locked to the stepped portion 63 of the motor outer shell 6. 2 is prevented from slipping out to the side opposite to the output side of the rotary shaft 21, and the fixing of the motor output side bracket 42 press-fitted to the outer peripheral surface of the motor outer shell 6 and the motor outer shell 6 is strengthened.

  As shown in FIGS. 1 to 8, the conductive plate 5 is joined to the output side bearing house 411 and the non-output side bracket 42. Hereinafter, the conductive plate 5 will be described in detail. As shown in FIG. 5 to FIG. 8, the conduction plate 5 is made of metal such as conductive stainless steel, steel plate, brass, etc., and has a plate-like conduction band 51 and an output side bracket provided at one end of the conduction band 51. 41 of the output side bearing house 411, and one of the plurality of claws 425a to 425h of the opposite output side bracket flange 423 provided at the other end of the conduction band 51 (for example, 425a) and a second joint portion 53 sandwiched between the fixing bracket flange 432 of the fixing bracket 43.

  As shown in FIGS. 1 to 5, the conduction band 51 is formed in a shape that is bent along the outer shape of the motor shell 6 and the fixing bracket 43 from one end to the other end of the conduction band 51. As shown in FIGS. 3 to 7, the first joint portion 52 is joined to the outer peripheral surface of the output side bearing house 411. The shape of the first joint portion 52 is, for example, a ring shape formed on an extension line without being bent from one end of the conduction band 51, and the inner peripheral side of the ring-shaped first joint portion 52 is an output side bearing. It is press-fitted into the outer peripheral surface of the house 411. Since the inner peripheral side of the ring-shaped first joint portion 52 is formed from a thin plate as the conduction plate 5, the press-fitted state to the output-side bearing house 411 is maintained and the output-side bearing house 411 is hardly detached. Therefore, it is formed in an uneven shape.

  As shown in FIGS. 3 to 8, the second joint portion 53 is formed by connecting one claw portion 425 a and the fixing bracket flange 432 among the plurality of claw portions 425 a to 425 h provided on the non-output-side bracket flange 423. Sandwiched between them. The second bonding portion 53 is, for example, a flat plate portion formed in a state bent from the other end of the conduction band 51 and has a rectangular shape formed with a width wider than the width of the conduction band 51. The flat plate portion is fixed by bending and crimping one claw portion 425a together with the fixing bracket flange 432. And in order to ensure contact with this nail | claw part 425a, the flat plate part has the processus | protrusion 531 which is formed in the center of a flat plate part, and is crushed and press-contacted when it crimps with the nail | claw part 425a. In addition, the flat plate portion serves as a mark for determining the position of the claw portion 425a and the projection 531. When the projection 531 is caulked with the claw portion 425a, the projection 531 is prevented from being misaligned with the claw portion 425a. There are two protrusions 532 at locations that are formed on both sides of the lip and are not joined to the claw portion 425a. That is, the interval between the two protrusions 532 is larger than the width of the claw portion 425a. Since the protrusion 531 is higher than the height of the protrusion 531 that collapses when the protrusion 531 is caulked with the claw portion 425a, the lateral displacement of the flat plate portion with respect to the claw portion 425a is prevented.

  According to the motor M according to the present embodiment described above, the ring-shaped first joint 52 provided at one end of the conduction band 51 and the output side bearing house 411 are electrically connected to each other, and the other end of the conduction band 51. The flat plate portion which is the second joint portion 53 provided on the non-output side bearing house 422 is electrically connected through the claw portion 425a of the non-output side bracket 42. As a result, since the output side bearing house 411 and the non-output side bearing house 422 can be made conductive by the conduction plate 5, the potential difference between the output side bearing 31 and the counter output side bearing 32 can be reduced when the motor M is driven. Elimination can be prevented from occurring in the output-side bearing 31 and the non-output-side bearing 32.

  Further, according to the motor M according to the present embodiment, the fixing bracket flange 432 and the non-output-side bracket flange 423 are brought into contact with each other, and the plurality of claw portions 425a to 425h are caulked with respect to the fixing bracket flange 432. In the motor M, any one of the plurality of claw portions 425a to 425h (for example, 425a) and the second joint portion 53 provided at the other end of the conduction band 51 of the conduction plate 5 by the fixing bracket flange 432. A certain flat plate part is clamped and crimped. For this reason, as shown in the background art, it is not necessary to form a groove on the outer peripheral surface of the outer shell of the motor so as to sandwich the joint end provided at the other end of the conduction band of the conduction plate. Since the shape of the part does not have to be formed along the outer peripheral surface of the motor outer shell, the shape of the motor outer shell 6 and the shape of the conductive plate 5 can be made simple.

  Further, according to the motor M according to the present embodiment, the fixing bracket flange 432 and the non-output-side bracket flange 423 are brought into contact with each other, and the plurality of claw portions 425b to 425h among the plurality of claw portions 425a to 425h are fixed. After the crimping with respect to the bracket flange 432, the flat plate portion which is the second joint portion 53 provided at the other end of the conductive plate 5 is finally clamped and crimped by one claw portion 425a and the fixing bracket flange 432. Therefore, the conduction plate 5 can be easily attached from the outside of the motor outer shell 6.

  In addition, the conductive plate 5 is provided at the other end of the conductive band 51 of the conductive plate 5 by any one of the plurality of claw portions 425 a to 425 h (for example, the claw portion 425 a) and the fixing bracket flange 432. 2 Since the flat plate portion which is the joining portion 53 is sandwiched and crimped, there is no restriction on the position of the conductive plate 5 with respect to the motor outer shell 6, and the workability when the conductive plate 5 is attached from the outside of the motor M is good. The position of the conduction plate 5 can be selected according to the application of the motor M.

  In the motor M according to the present embodiment, the first joining portion 52 of the conduction plate 5 has a ring shape formed on the extension line without being bent from one end of the conduction band 51. Not limited to this, as long as the structure is joined to the output-side bearing house 411, the first joint portion 52 of the conductive plate 5 may not be in a ring shape. For example, the structure of the conductive plate 5 includes a concave portion that is press-fitted into a convex portion on the axial end surface of the rotating shaft 21 of the motor outer shell 6 as the conductive band 51 of the conductive plate 5. As one joining part 52, you may become the rectangular shape formed on the extension line, without being bent from the end of the conduction band 51. FIG. In addition, the second joining portion 53 of the conduction plate 5 is a flat plate portion formed in a state bent from the other end of the conduction band 51 and has a rectangular shape formed with a width wider than the width of the conduction band. The flat plate portion which is the two joint portion 53 is clamped by being clamped by the claw portion 425a and the fixing bracket flange 432. However, the present invention is not limited to this, and any one of the plurality of claw portions 425a to 425h. As long as the structure is sandwiched between the claw portion 425a (for example, the claw portion 425a) and the fixing bracket flange 432, the flat plate portion that is the second joint portion 53 of the conductive plate 5 may not be rectangular. For example, the second bonding portion 53 of the conduction plate 5 is a flat plate portion formed in a state of being bent from the other end of the conduction band 51 and has a rectangular shape having the same width as the width of the conduction band. Also good.

  Furthermore, although the non-output side bracket 42 press-fitted into the outer peripheral surface of the motor outer shell 6 and the fixing bracket 43 for strengthening the fixing of the motor outer shell 6 are provided, the present invention is not limited to this, and the non-output side bracket is provided. If the fixing of the bracket 42 and the motor outer shell 6 can be secured, the fixing bracket 43 can be omitted. For example, in this case, it is not necessary to form a small-diameter portion and a large-diameter portion on the outer peripheral surface of the motor outer shell 6, and there may be a counter-output side bracket 42 that is press-fitted into the outer peripheral surface of the motor outer shell 6. The counter-output side bracket 42 does not need to form the counter-output side bracket flange 423 in an annular shape, and the counter-output side bracket flange 423 only needs to have one claw portion. The second joint portion of the conductive plate 5 is sandwiched between one claw portion of the non-output side bracket flange and the non-output side bracket flange.

DESCRIPTION OF SYMBOLS 1 Stator 11 Insulator 12 Winding 13 Stator core 2 Rotor 21 Rotating shaft 31 Output side bearing 32 Counter output side bearing 41 Output side bracket 411 Output side bearing house 412 Flange part 42 Counter output side bracket 421 Counter output side bracket main body part 422 Counter output Side bearing house 423 Opposite output side bracket flange 424 Opening 425a to 425h Claw part 43 Fixing bracket 431 Fixing bracket body part 432 Fixing bracket flange 433 Locking part 434 Opening 435 Opening 5 Conducting plate 51 Conducting band 52 First joint part 53 2nd junction part 531 Protrusion 532 Protrusion 6 Motor outline 61 Small diameter part 62 Large diameter part 63 Step part M Motor

Claims (4)

A cylindrical stator covered with a motor shell formed of resin, a rotor having a rotation shaft and disposed on the inner peripheral side of the stator, and an output-side bearing that supports the output side of the rotation shaft of the rotor A counter-output side bearing that supports a counter-output side of the rotating shaft of the rotor, a metal output-side bracket disposed on the motor outline on the output side of the rotating shaft of the rotor, and the rotor of the rotor A metal anti-output side bracket disposed on the outer side of the motor on the non-output side of the rotating shaft,
The output-side bracket has an output-side bearing house for accommodating the output-side bearing, and a flange portion that extends around the output-side bearing house and is integrated with the motor shell,
The non-output side bracket includes a cylindrical anti-output side bracket main body having a bottom surface press-fitted into the outer peripheral surface of the motor outer shell, and an anti-output side bearing house provided on the bottom surface for accommodating the non-output side bearing. A motor having an anti-output side bracket flange formed outward from a peripheral edge of an opening of the anti-output side bracket main body, and a pawl projecting outward from an outer edge of the anti-output side bracket flange Because
A plate-like conduction band; a first joint provided at one end of the conduction band and joined to the output-side bearing house of the output-side bracket; and a claw part and the counter-action provided at the other end of the conduction band. A motor comprising a conductive plate having conductivity and a second joint portion sandwiched between the output side bracket flange. A cylindrical stator covered with a motor shell formed of resin, a rotor having a rotation shaft and disposed on the inner peripheral side of the stator, and an output-side bearing that supports the output side of the rotation shaft of the rotor A counter-output side bearing that supports a counter-output side of the rotating shaft of the rotor, a metal output-side bracket disposed on the motor outline on the output side of the rotating shaft of the rotor, and the rotor of the rotor A metal anti-output side bracket disposed on the motor outer shell on the non-output side of the rotating shaft, and a fixing bracket for fixing the anti-output side bracket and the motor outer shell,
The output-side bracket has an output-side bearing house for accommodating the output-side bearing, and a flange portion that extends around the output-side bearing house and is integrated with the motor shell,
The non-output side bracket includes a cylindrical anti-output side bracket main body having a bottom surface press-fitted into the outer peripheral surface of the motor outer shell, and an anti-output side bearing house provided on the bottom surface for accommodating the non-output side bearing. A ring-shaped anti-output side bracket flange formed outward from a peripheral edge of the opening of the counter-output side bracket main body, and a plurality of protrusions projecting outward from the outer peripheral edge of the counter-output side bracket flange Have nail parts,
The fixing bracket is formed so as to be directed outward from a peripheral edge of one opening of the fixing bracket main body portion and a cylindrical fixing bracket main body portion that is attached so as to cover an outer peripheral surface of the motor outer shell. It has an annular fixing bracket flange,
A motor in which the plurality of claws are fixed to the fixing bracket flange in a state in which the opposite output side bracket flange and the fixing bracket flange are in contact with each other;
A plate-like conduction band; a first joint provided at one end of the conduction band and joined to the output-side bearing house of the output-side bracket; and a plurality of claws provided at the other end of the conduction band. A motor comprising a conductive plate having conductivity including any one of the claw portions and a second joint portion sandwiched between the fixing bracket flange of the fixing bracket.   The said 2nd junction part is a flat plate part formed in the state bent from the other end of the said conduction band, and has a protrusion in the center of the said flat plate part, The Claim 1 or Claim 2 characterized by the above-mentioned. Motor.   The motor according to claim 3, wherein the flat plate portion has protrusions on both sides of the protrusion.

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