JP5706199B2 - Electromagnetic rotating machine, manufacturing method thereof, and manufacturing apparatus of electromagnetic rotating machine - Google Patents

Description

  The present invention relates to an electromagnetic rotating machine such as a DC motor, a manufacturing method thereof, and an electromagnetic rotating machine manufacturing apparatus.

  Conventionally, as a rotor structure of an electromagnetic rotating machine, a DC motor having a rotating shaft, a rotor core fixed to the rotating shaft, a plurality of magnets arranged in the circumferential direction of the rotor core, and a case covering the periphery of the magnet Is known (Patent Document 1).

  By the way, in this kind of rotor structure, in general, in order to prevent leakage magnetic flux from the case, a cylindrical flux yoke is covered on the outer periphery of the case. In the DC motor disclosed in Patent Document 1, the recesses provided on the case (frame) side and the protrusions provided on the cylindrical flux yoke side are engaged to fix the positioning of both members.

JP-A-11-299160

  In the DC motor disclosed in Patent Document 1 described above, the protrusion is provided on the end side of the cylindrical flux yoke, and the position is set as the engaging position. Therefore, the assembling property when the cylindrical flux yoke is mounted on the case side. There is a problem that is bad.

  Therefore, in view of the circumstances described above, the present invention provides an electromagnetic rotating machine, a method for manufacturing the same, and a manufacturing apparatus for an electromagnetic rotating machine that have improved assemblability when a cylindrical member is attached to the outer periphery of the case of the main body of the electromagnetic rotating machine. To do.

An electromagnetic rotating machine of the present invention for solving the above-mentioned problems is a rotor unit having a rotor core fixed to a rotating shaft, a magnet disposed outside the rotor core, a cylindrical case surrounding the outer periphery of the magnet, A cylindrical member attached to the outside of the cylindrical case, and the cylindrical member includes a slit portion discontinuous in a circumferential direction, and an engaging portion that engages with an outer peripheral surface of the cylindrical case. In the state where the engaging portion of the cylindrical member is engaged with the outer peripheral surface of the cylindrical case, the position of the engaging portion in the circumferential direction of the cylindrical member is the slit portion. The position of the engaging portion in the axial direction of the cylindrical member is a position between the opposite ends of the cylindrical member in the axial direction. In the center of It is characterized in.

The method of manufacturing an electromagnetic rotating machine according to the present invention includes a rotor unit having a rotor core fixed to a rotating shaft, a magnet disposed outside the rotor core, a cylindrical case surrounding an outer periphery of the magnet, and the cylinder. A method of manufacturing an electromagnetic rotating machine including a cylindrical member attached to the outside of a cylindrical case, wherein the cylindrical member includes a slit portion discontinuous in a circumferential direction, and an outer periphery of the cylindrical case The engaging portion in the circumferential direction of the cylindrical member in a state where the engaging portion of the cylindrical member is engaged with the outer peripheral surface of the cylindrical case. Is a position facing the slit portion in a direction orthogonal to the axial direction of the rotating shaft, and the position of the engaging portion in the axial direction of the cylindrical member is the cylindrical member Between both ends in the axial direction A position where the central portion, providing a pre-assembled unit fitted with the tubular member on the outside of the tubular case, engaging the engaging portion of the tubular member to the engaged portion of the tubular casing The cylindrical member is moved along the outer periphery of the cylindrical case to be matched.

Further, the cylindrical apparatus for producing an electromagnetic rotating machine of the present invention, the electromagnetic rotary machine, which surrounds a rotor unit having a rotor core fixed to the rotary shaft, and a magnet disposed outside of the rotor core, the outer periphery of said magnet And a cylindrical member attached to the outside of the cylindrical case, and the cylindrical member is engaged with a slit portion discontinuous in a circumferential direction and an outer peripheral surface of the cylindrical case In the state where the engaging portion of the cylindrical member is engaged with the outer peripheral surface of the cylindrical case, the position of the engaging portion in the circumferential direction of the cylindrical member is The position of the engaging portion in the axial direction of the cylindrical member is a position facing the slit portion in a direction orthogonal to the axial direction of the rotating shaft, and the axial direction of the cylindrical member And the central part between both ends in That is a position, wherein the manufacturing apparatus includes a mounting table for mounting the pre-assembled unit fitted with the tubular member on the outside of the tubular casing, at the mounting table on the engagement of the tubular member Positioning and fixing means for moving the cylindrical member along the outer periphery of the cylindrical case so as to engage the portion with the engaged portion of the cylindrical case is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic rotating machine which improved the assembly property at the time of mounting | wearing a cylindrical member on the outer periphery of the case of an electromagnetic rotating machine main body, its manufacturing method, and the manufacturing apparatus of an electromagnetic rotating machine can be provided.

FIG. 2 is an exploded perspective view illustrating a schematic configuration of the electromagnetic rotating machine according to the first embodiment. FIG. 2 is an assembly cross-sectional view illustrating a schematic configuration of the electromagnetic rotating machine according to the first embodiment. Schematic of the unit holder structure concerning the electromagnetic rotating machine of Embodiment 1. FIG. Sectional drawing of the unit holder which concerns on the electromagnetic rotating machine of Embodiment 1. FIG. Schematic for demonstrating the structure comparison with the reference example of an electromagnetic rotary machine. FIG. 3 is a schematic perspective view showing an auxiliary yoke attachment example 1 of the electromagnetic rotating machine according to the first embodiment. FIG. 3 is a schematic perspective view showing an auxiliary yoke attachment example 2 of the electromagnetic rotating machine according to the first embodiment. Schematic which shows the manufacturing apparatus of the electromagnetic rotating machine of Embodiment 1. FIG.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.
(Embodiment 1)

  FIG. 1 is an exploded perspective view showing a schematic configuration of an electromagnetic rotating machine according to Embodiment 1 of the present invention. FIG. 2 is an upper opening view and an AA assembly sectional view showing a schematic configuration of the electromagnetic rotating machine according to the first embodiment of the present invention. Further, FIG. 3 is a schematic view of a unit holder configuration of the electromagnetic rotating machine according to the first embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line BB of FIG.

  As shown in FIGS. 1 to 4, the electromagnetic rotating machine 1 of the present embodiment is an electromagnetic force motor, and includes a rotor unit 13 having a rotor core (laminated core) 12 fixed to a rotating shaft (shaft) 11, and the like. A unit holder 14 that holds the rotor unit 13 and a pair of arc-shaped magnets 15 that surround the rotor core 12 from the outer periphery thereof are housed in an arc-shaped case (tubular case) 16. A substrate 17 having an external connection connector 17a is mounted on the end surface 14a side of the electromagnetic rotating machine 1 on the unit holder 14 side.

  Here, the rotor unit 13 constituting the drive unit of the electromagnetic rotating machine 1 includes a rotating shaft 11, a rotor core 12, and a pair of insulators (insulators) 18 attached to both ends of the rotor core 12. The rotor unit 13 is wound with a wire from above a set of insulators 18 attached to the rotor core 12 (not shown).

  Further, one end portion side of the rotor unit 13 is held by the unit holder 14, and in this state, one end portion of the rotating shaft 11 protruding from the rotor unit 13 is connected via a commutator (commutator) 19, a washer 20 and a bearing 21. Are inserted into the insertion holes of the unit holder 14. The commutator 19 is fixed to the rotary shaft 11 together with a varistor 22 soldered to a commutator terminal (not shown). The rotary shaft 11 on the other end side of the rotor unit 13 is inserted and held in a shaft insertion hole (top surface hole) 16a of the case via a washer 20 and a bearing 21. A gear (gear) 23 is press-fitted into the distal end portion of the rotary shaft 11 protruding from the shaft insertion hole 16a of the case 16, and power is transmitted to the outside although not shown.

  Further, a set of brushes 24 electrically connected to the commutator 19 mounted on the rotating shaft 11 of the rotor unit 13 is held in the unit holder 14 that holds the rotor unit 13. Specifically, as shown in FIGS. 1 and 3, each brush 24 is fixed to the tip of a brush arm (brush support) 25 made of a leaf spring member that is elastically deformed. Further, the base end side of each brush arm 25 is mounted and fixed to the unit holder 14. The pair of brushes 24 is configured to sandwich the commutator 19 from both sides in the radial direction by elastic deformation of each brush arm 25. As a result, when the commutator 19 rotates, a set of brushes 24 are electrically connected to the commutator 19, and a current is sequentially supplied to each phase of a winding (not shown), inside a pair of arc-shaped magnets 15 described later. The rotor unit 13 rotates. An anti-vibration rubber 26 is attached to the back surface of the brush arm 25.

  Here, in such an electromagnetic rotating machine 1, as described above, the pair of arc-shaped magnets 15 are arranged on the outer peripheral side of the rotor core 12. That is, the pair of arcuate magnets 15 are disposed between the case 16 and the rotor core 12. The pair of arcuate magnets 15 are made of permanent magnets and serve as magnetic force generating means for generating a rotating magnetic force with respect to the rotor core 12. In the present embodiment, the pair of arcuate magnets 15 includes a first magnet disposed on the S pole side and a second magnet disposed on the N pole side, that is, two on the S pole and the N pole. It was composed of divided arc magnets.

  Further, as shown in FIGS. 1 and 2, a direction in which the pair of opposed arc-shaped magnets 15 are separated along the inner periphery of the case 16 between adjacent one end portions of the pair of arc-shaped magnets 15. A magnet pin 27 serving as an urging means for urging the lens is disposed. That is, the magnet pin 27 is press-fitted and fixed in a gap defined by one end of the pair of arc-shaped magnets 15 disposed in the case 16 and the case 16. For example, in the present embodiment, the magnet pin 27 is formed by bending a metal elongated plate member into a hook shape.

  Then, on the end portion of the unit holder 14, as shown in FIGS. 3 and 4, the unit holder 14 is disposed between the other adjacent end portions of the pair of arc-shaped magnets 15 in the approaching direction of the pair of arc-shaped magnets 15. A restricting protrusion 140 for restricting the movement is integrally provided. The pair of arc-shaped magnets 15 are substantially restricted from rotating in the case 16 by the restricting protrusions 140. Further, the pair of arc-shaped magnets 15 are firmly sandwiched between the restricting protrusion 140 and the magnet pin 27 under the action of the urging force of the magnet pin 27, and are positioned and fixed in the case 16. In addition, for example, in the present embodiment, such a restriction protrusion 140 constitutes a part of the unit holder 14 that is an integrally molded product of a resin material.

  Further, in the present embodiment, the restricting protrusion 140 of the unit holder 14 has a shape that is pressed against the inner peripheral surface of the case 16 by receiving a biasing force from the magnet pin 27 against the pair of arc-shaped magnets 15. Specifically, both side surfaces of the restricting projection 140 are tapered surfaces 140a that come into contact with the circumferential end surfaces of the pair of arc-shaped magnets 140 (see FIG. 3). Each of these tapered surfaces 140 a is formed in a radial shape when viewed from the axial direction of the rotating shaft 11. That is, the tapered surfaces 140a are provided so as to spread toward the case 16 side. For this reason, when one end of the pair of arcuate magnets 15 is pressed by the magnet pin 27, the other end of the pair of arcuate magnets 15 presses the restricting protrusion 140. At this time, the other ends of the pair of arcuate magnets 15 are slidably contacted along the respective tapered surfaces 140a, whereby the entire unit holder 14 including the restricting protrusions 140 is pressed against the case 16 side. Thereby, the pair of arc-shaped magnets 15 and the unit holder 14 can be firmly positioned and fixed at predetermined positions in the case 16.

  In particular, according to the present embodiment, each brush 24 is mounted on the unit holder 14, so that the restriction projection 140 of the unit holder 14 causes the pair of arc-shaped magnets 15 and each brush 24 (brush arm 25) to be connected. The circumferential position is relatively determined. As a result, the circumferential positions of the salient poles of the brush 24 and the rotor core 12 are also determined, and the optimum commutation timing can be realized. That is, according to the present embodiment, the relative position between the unit holder 14 that holds the brush 24 and the pair of arc-shaped magnets 15 can be set to a predetermined position only by inserting and arranging the restricting protrusion 140 between the pair of arc-shaped magnets 15. Therefore, it is troublesome to separately adjust the relative position between the pair of arc-shaped magnets 15 and the brush 24 so as to optimize the commutation timing of the current flowing through the winding and maximize the torque constant. Can be omitted.

  In this embodiment, as described above, since the restricting protrusion 140 is integrally provided on the unit holder 14, the structure can be simplified, excellent assemblability can be realized, and cost can be reduced. . In addition, it is advantageous in reducing the size and cost of the entire motor while increasing the magnetic force generated by increasing the grade of the magnet.

  Furthermore, in this embodiment, since the restricting protrusion 140 constitutes a part of the unit holder 14 that is an integrally molded product of resin material, the vibrations of the pair of arc-shaped magnets 15 and the case 16 are attenuated (absorbed or the like). ) And can be expected to reduce noise.

  Instead of the positioning restricting projection 140, a cut-and-bent portion (cut-up) 51 is provided in a part of the case 50 as in the reference example shown in FIG. A member that bends to the side (inside the case 50) and fixes the magnet 52 in the case 50 may be used. On the other hand, the case 50 forms a magnetic circuit together with the magnet 52 and the rotor core.

  For this reason, in the configuration of the reference example of FIG. 5, although the magnet 52 can be fixed, if a hole is formed in the outer periphery of the case 50, a part of the magnetic circuit is cut out, resulting in magnetic As the resistance increases, the magnetic flux density in the gap (between the magnet 52 and the rotor core) that generates the rotational torque decreases, which causes the motor torque to decrease. In the present embodiment, instead of providing the cut-and-bent portion 51 in the case 50, a restriction projection 140 is integrally provided on the unit holder 14, and the restriction projection 140 is inserted between the pair of arcuate magnets 15. Therefore, the configuration is very simple and excellent in assemblability. Further, since it is not a configuration in which the cut and bent portion 51 is provided, there is no fear of a reduction in motor performance. Moreover, in this embodiment, since case 16 can ensure cylindrical shape, compared with the case where the cut-and-bent part 51 is provided, a magnetic flux follows better and magnetic resistance reduces. Thereby, the magnetic flux density of the air gap between the rotor core 12 and the pair of arc-shaped magnets 15 is increased, and there is an effect that the torque of the motor can be increased.

  Here, a plate-shaped (band-shaped) auxiliary yoke 29 having a slit portion 28 is mounted as a cylindrical member on the outside (around the waist) of the case 16 of the electromagnetic rotating machine 1 having the above-described configuration (FIG. 1). Torque can be increased by fitting the auxiliary yoke 29 to the outer periphery of the case 16 to create a magnetic flux path.

  The details of the auxiliary yoke 29 will be described later with reference to FIGS. 6 and 7, but a slit portion 28 having a discontinuous portion in the circumferential direction and an engaging portion that engages with the outer peripheral surface of the case 16. And a convex portion 30. As this convex part 30, it was set as the circular convex part 30 in this embodiment, for example. On the other hand, a recess 16 b is provided on the outer peripheral surface of the case 16. That is, the auxiliary yoke 29 can be positioned and fixed on the outer periphery of the case 16 by engaging the convex portion 30 of the auxiliary yoke 29 with the concave portion 16 b of the case 16.

  Such an engagement position between the auxiliary yoke 29 and the case 16, that is, a relative positioning and fixing position between the two members, includes an end portion (including an edge portion) of the auxiliary yoke 29 with the slit portion 28 as a reference position for engagement. ) Are provided correspondingly in the central region. In particular, it is desirable that the engagement position between the auxiliary yoke 29 and the case 16 is within a central region facing the slit portion 28 and symmetrical with the slit portion 28. In the present embodiment, the engaging position between the auxiliary yoke 29 and the case 16 is set to a symmetrical position (a central portion in the width direction and a central portion in the circumferential direction of the auxiliary yoke 29) in the central region facing the slit portion 28. Thereby, the directionality of the whole auxiliary yoke 29 is substantially lost, and the assemblability with respect to the case 16 can be remarkably improved. It should be noted that the position of the positioning engagement portion (projection 30) of the auxiliary yoke 29 with respect to the case 16 can be improved if at least the directionality in the width direction or the circumferential direction of the auxiliary yoke 29 can be eliminated. In order to contribute, the position of the auxiliary yoke 29 is not necessarily completely symmetrical.

  Further, the engaging position between the auxiliary yoke 29 and the case 16 is provided at a position facing the pair of arcuate magnets 15 except between adjacent ends of the pair of arcuate magnets 15. This is to prevent the passage of the magnetic flux corresponding to the gap between the magnets 15 from being obstructed at the engaging portion between the auxiliary yoke 39 and the case 16. However, if the engagement portion between the auxiliary yoke 29 and the case 16 is made small, it may be provided corresponding to the gap between the magnets 15.

  As described above, in this embodiment, the auxiliary yoke 29 is annularly mounted on the outer periphery of the case 16 to substantially widen the path of the magnetic flux and to reduce the magnetic resistance. Moreover, in the structural example of this embodiment, since the through-hole is not provided in case 16, the path of magnetic flux is not inhibited.

  Hereinafter, with reference to FIG.6 and FIG.7, the manufacturing method (assembly method) of the electromagnetic rotating machine 1 of this embodiment and the manufacturing apparatus of the electromagnetic rotating machine 1 are demonstrated. FIG. 6 is a schematic perspective view showing an auxiliary yoke attachment example 1 of the electromagnetic rotating machine according to the present embodiment. FIG. 7 is a schematic perspective view showing an auxiliary yoke attachment example 2 of the electromagnetic rotating machine according to the present embodiment. FIG. 8 is a schematic diagram showing an electromagnetic rotating machine manufacturing apparatus according to the present embodiment.

[Auxiliary yoke mounting example 1]
In the first mounting example, first, as shown in FIG. 6A, in an expanded state in a circular arc shape through the slit portion 28 of the auxiliary yoke 29, it is inserted into the outer periphery of the case 16 of the electromagnetic rotating machine body. This is referred to as a temporary assembly unit 1A. At this time, the auxiliary yoke 29 is inserted into the outer periphery of the case 16 so that the convex portion 30 of the auxiliary yoke 29 and the concave portion 16b of the case are in different phases around the axis of the rotating shaft 11 (the relative positions are shifted). . In the present embodiment, the engaging position between the auxiliary yoke 29 and the case 16 is a symmetrical position in the central region facing the slit portion 28, so that the directionality of the entire auxiliary yoke 29 is substantially eliminated, and the assembly with respect to the case 16 is performed. The sex can be greatly improved. Here, the auxiliary yoke 29 is inserted into the outer periphery of the case 16 until the positional relationship between the convex portion 30 of the auxiliary yoke 29 and the concave portion 16b of the case 16 in the axial direction of the rotating shaft 11 substantially matches. When the auxiliary yoke 29 is inserted into the outer periphery of the case 16 as described above, the slit portion 28 of the auxiliary yoke 29 is used as a reference position for temporary assembly with respect to the case 16.

  Next, as shown in FIGS. 6B and 6C, the temporary assembly unit 1A is fixed on a mounting table (not shown), and in this state, only the auxiliary yoke 29 is held, and the auxiliary yoke 29 is attached to the case. It is moved (rotated here) along the outer periphery of 16 and assembled. At this time, by fitting the convex portion 30 of the auxiliary yoke 29 and the concave portion 16b of the case 16 and positioning and fixing their relative positions, the electromagnetic rotating machine 1 as shown in FIG. Can be assembled.

  Whether or not the convex portion 30 of the auxiliary yoke 29 is engaged with the concave portion 16b of the case 16 is detected as shown in FIG. 8 by detecting a gap (about several millimeters) between the auxiliary yoke 29 and the case 16. The gap detection device (contact displacement sensor or the like) 100 can be used. Specifically, the distance to the surface of the auxiliary yoke 29 is directly detected by the detection terminal (contactor) 101 of the gap detection device 100, and the convex portion 30 of the auxiliary yoke 29 is fitted into the concave portion 16b of the case 16. A difference G between the distance before mating and the distance after mating is detected based on the amount of movement (pushing amount) of the detection terminal 101 and the like, and the presence / absence of engagement between the auxiliary yoke 29 and the case 16 is determined. That is, it is detected that the auxiliary yoke 29 has been fitted into the case 16 by detecting a change in the gap between the auxiliary yoke 29 and the case 16 (the height of the convex portion 30).

  Here, as a manufacturing apparatus of the electromagnetic rotating machine 1, in order to engage the convex portion 30 of the auxiliary yoke 29 with the concave portion 16b of the case 16 on the mounting table on which the temporary assembly unit 1A is mounted. A positioning and fixing means for moving the auxiliary yoke 29 along the outer periphery of the case 16 may be provided. Such positioning and fixing means includes moving means (rotating claw 40 in FIG. 8) for moving the auxiliary yoke 29 along the outer periphery of the case 16 and engagement detecting means such as the gap detecting device 100 described above. can do. According to such a manufacturing apparatus of the electromagnetic rotating machine 1, the electromagnetic rotating machine 1 can be automatically assembled, and the apparatus has high productivity.

[Auxiliary yoke mounting example 2]
In the second mounting example, first, as shown in FIG. 7A, in an expanded state in a circular arc shape through the slit portion 28 of the auxiliary yoke 29, it is inserted into the outer periphery of the case 16 of the electromagnetic rotating machine body. This is referred to as a temporary assembly unit 1B. At this time, the auxiliary yoke 29 is inserted into the outer periphery of the case 16 so that the positions of the convex portion 30 of the auxiliary yoke 29 and the concave portion 16 b of the case 16 around the axis of the rotation shaft 11 coincide. Here, in the insertion direction of the auxiliary yoke 29, the auxiliary yoke 29 is temporarily fitted to the outer periphery of the case 16 until the convex portion 30 of the auxiliary yoke 29 is slightly ahead of the concave portion 16b of the case 16.

  Next, as shown in FIGS. 7B and 7C, the temporary assembly unit 1B is fixed on a mounting table (not shown), and in this state, only the auxiliary yoke 29 is held, and the auxiliary yoke 29 is attached to the case. It moves along the outer periphery of 16 (it pushes in the axial direction of the rotating shaft 11 here). Thus, the convex portion 30 of the auxiliary yoke 29 and the concave portion 16b of the case 16 are fitted and the relative positions of both members are positioned and fixed, so that the electromagnetic rotating machine 1 as shown in FIG. Can be assembled efficiently.

(Other embodiments)
As mentioned above, although this invention was demonstrated based on Embodiment 1, this invention is not limited to Embodiment 1 mentioned above.

  For example, in Embodiment 1 described above, the pair of arc-shaped magnets 15 is configured by the first magnet disposed on the S pole side and the second magnet disposed on the N pole side. Of course, the present invention is not limited to this. For example, when a plurality of arc-shaped magnets divided into an even number of four or more are arranged around the rotor unit in order to reduce torque fluctuation, the gaps between the arc-shaped magnets are arranged. One or a plurality of restricting protrusions protruding from the unit holder and an urging means for urging the adjacent magnet may be provided in combination as appropriate. Here, the pair of arc-shaped magnets referred to in the present invention is not limited to a two-divided arc-shaped magnet (a set of arc-shaped magnets), but a plurality of sets of arc-shaped magnets polarized on the S pole side and the N pole side. It is a broad concept including magnets.

  Moreover, in Embodiment 1 mentioned above, although the example which has arrange | positioned the magnet pin 27 as an urging | biasing means between the adjacent one end parts of a pair of circular magnet 15 was given and demonstrated, of course, this invention is not limited to this, The biasing means may bias the pair of arc-shaped magnets while being fixed to the unit holder. In this case, the urging means (plate spring member or the like) is mounted in advance on the unit holder side, and the urging means is press-fitted and fixed together with the unit holder between the magnets. As a result, the assemblability can be improved. In addition, for example, two protrusions may be integrally provided from the unit holder, and one protrusion may be the above-described restriction protrusion, and the other protrusion may be the urging means. In this case, for example, the protrusion serving as the urging means and the protrusion serving as the restricting protrusion can be provided in the same shape and integrally with the unit holder. Further, the pair of arc-shaped magnets can be firmly fixed in the case by press-fitting two projecting portions between the pair of arc-shaped magnets arranged in the case.

  Furthermore, in the first embodiment described above, the example of the engagement structure in which the convex portion 30 is provided on the auxiliary yoke 29 side and the convex portion 16b is provided on the case 16 side has been described, but the present invention is of course not limited thereto. It is good also as a recessed part (a recessed groove is included) and a case side as a convex part.

  The electromagnetic rotating machine of the present invention can be applied to various devices for feeding various originals such as banknotes, checks, securities, originals, and recording paper, for example, drive motors for scanners, printers, facsimiles, copiers, and the like.

DESCRIPTION OF SYMBOLS 1 Electromagnetic rotating machine 11 Rotating shaft 12 Rotor core 13 Rotor unit 14 Unit holder 15 A pair of arc-shaped magnet 16 Case 16b Recessed part 17 Substrate 18 Insulator 19 Commutator 20 Washer 21 Bearing 22 Varistor 23 Gear 24 Brush 25 Brush arm 26 Anti-vibration rubber 27 Magnet Pin 28 Slit part 29 Auxiliary yoke 30 Convex part 140 Restriction projection part

Claims (6)

A rotor unit having a rotor core fixed to a rotating shaft;
A magnet disposed outside the rotor core;
A cylindrical case surrounding the outer periphery of the magnet;
A cylindrical member attached to the outside of the cylindrical case,
The cylindrical member has a slit part discontinuous in the circumferential direction, and an engaging part that engages with the outer peripheral surface of the cylindrical case,
In a state where the engaging portion of the cylindrical member is engaged with the outer peripheral surface of the cylindrical case, the position of the engaging portion in the circumferential direction of the cylindrical member is the rotation shaft with respect to the slit portion. The position of the engaging portion in the axial direction of the cylindrical member is a central portion between both end portions in the axial direction of the cylindrical member. An electromagnetic rotating machine characterized by being a position . The magnet is composed of a pair of arc-shaped magnets surrounding the rotor core from its outer peripheral side,
The engagement position between the cylindrical member and the cylindrical case is provided at a position facing the pair of arcuate magnets except between adjacent ends of the pair of arcuate magnets. Item 2. The electromagnetic rotating machine according to item 1 . The magnet is composed of a pair of arc-shaped magnets surrounding the rotor core from its outer peripheral side,
A unit holder for holding the rotor unit;
Further comprising a biasing means for biasing in a direction away the pair of arc-shaped magnet disposed between the adjacent end portions along the pair of arc-shaped magnets on the inner periphery of the front Symbol cylindrical case,
On the end of the unit holder, there is integrally provided a restricting projection that is disposed between the other adjacent ends of the pair of arcuate magnets and restricts the movement of the pair of arcuate magnets in the approaching direction. And
3. The electromagnetic rotating machine according to claim 1, wherein the pair of arc-shaped magnets are positioned in the cylindrical case by being sandwiched between the restricting protrusion and the biasing unit. A rotor unit having a rotor core fixed to a rotating shaft;
A magnet disposed outside the rotor core;
A cylindrical case surrounding the outer periphery of the magnet;
A method of manufacturing an electromagnetic rotating machine comprising a cylindrical member attached to the outside of the cylindrical case,
The cylindrical member has a slit part discontinuous in the circumferential direction, and an engaging part that engages with the outer peripheral surface of the cylindrical case,
In a state where the engaging portion of the cylindrical member is engaged with the outer peripheral surface of the cylindrical case, the position of the engaging portion in the circumferential direction of the cylindrical member is the rotation shaft with respect to the slit portion. The position of the engaging portion in the axial direction of the cylindrical member is a central portion between both end portions in the axial direction of the cylindrical member. Position,
Providing a pre-assembled unit fitted with the tubular member on the outside of the tubular casing, said tubular member to engage the engagement portion of the tubular member to the engaged portion of the tubular casing A method for manufacturing an electromagnetic rotating machine, wherein the electromagnetic rotating machine is moved along an outer periphery of the cylindrical case. An electromagnetic rotating machine manufacturing apparatus,
The electromagnetic rotating machine is
A rotor unit having a rotor core fixed to a rotating shaft;
A magnet disposed outside the rotor core;
A cylindrical case surrounding the outer periphery of the magnet;
A cylindrical member attached to the outside of the cylindrical case ,
The cylindrical member has a slit part discontinuous in the circumferential direction, and an engaging part that engages with the outer peripheral surface of the cylindrical case,
In a state where the engaging portion of the cylindrical member is engaged with the outer peripheral surface of the cylindrical case, the position of the engaging portion in the circumferential direction of the cylindrical member is the rotation shaft with respect to the slit portion. The position of the engaging portion in the axial direction of the cylindrical member is a central portion between both end portions in the axial direction of the cylindrical member. Position,
The manufacturing apparatus includes:
A mounting table for mounting a temporary assembly unit in which the cylindrical member is attached to the outside of the cylindrical case;
At the mounting table on, positioning and fixing means for moving the tubular member to engage the engagement portion of the tubular member to the engaged portion of the tubular case along the outer periphery of the tubular casing An apparatus for manufacturing an electromagnetic rotating machine. The positioning and fixing means detects engagement between a moving means for moving the cylindrical member along the outer periphery of the cylindrical case, and an engaging portion of the cylindrical member and an engaged portion of the cylindrical case. The electromagnetic rotating machine manufacturing apparatus according to claim 5 , further comprising engagement detecting means for performing the operation.

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