JP2010166818A - Method for manufacturing motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which secures an enough fastening strength even when fixing magnets to the inner peripheral surface of a peripheral wall by adhering agents. <P>SOLUTION: In the motor 1, a portion of an outer peripheral surface 501 of a magnet 5 is fixed adhesively to an inner peripheral surface 301 of a peripheral wall 30 by a first adhering agent 81, and on an opening portion side 36 of the peripheral wall 30, the outer peripheral edge of a first recessed portion 511 of a first end surface 51 of the magnet 5 is fixed to the inner surface 301 of the peripheral wall 30 by a second adhering agent 82. Also, in a second end surface 52 of the magnet 5, the outer peripheral edge of a second recessed portion 521 is fixed to the inner surface 301 of the peripheral wall 30 by the first adhering agent 81. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a motor in which a magnet is fixed to an inner peripheral surface of a peripheral wall.

  In a motor in which a rotor is arranged inside a magnet fixed to the inner peripheral surface of the peripheral wall of the case, conventionally, when fixing the magnet to the inner peripheral surface of the case, a part of the case is cut and raised with a fixing pin. It is proposed to press and fix (see, for example, Patent Document 1).

  A structure in which a protrusion is formed on the peripheral wall of the case and a magnet is sandwiched and fixed by the protrusion has been proposed (see, for example, Patent Document 2).

  In addition, as a technique for bonding and fixing the peripheral wall and the magnet, after inserting the magnet into the peripheral wall of the rotor, a technique of applying an adhesive between the end surface on the opening side and the peripheral wall, A technique has been proposed in which a groove extending in the axial direction is formed and an adhesive is supplied from the groove (see, for example, Patent Document 3).

  In addition, after applying the adhesive to the peripheral wall of the yoke, when the magnet is slid in the axial direction along the peripheral wall of the yoke from the opening side, the groove extending in the axial direction is formed on the outer peripheral surface of the magnet. A technique for forming the structure has been proposed (see, for example, Patent Document 4).

Japanese Utility Model Publication No. 03-60853 Japanese Utility Model Publication No. 02-53270 Japanese Patent Laid-Open No. 11-356026 JP 2004-159384 A

  However, when a fixing member such as a fixing pin is used as in the technique described in Patent Document 1, the number of parts is increased, and the work is time-consuming, resulting in an increase in cost. In addition, as in the technique described in Patent Document 2, the structure in which the magnet is sandwiched and fixed by the protrusions or the structure in which the magnet is press-fitted has problems such as generation of magnet debris and cracking of the magnet.

  On the other hand, as in the techniques described in Patent Documents 3 and 4, the method of bonding and fixing the magnet can solve the problems that occur in the techniques described in Patent Documents 1 and 2. However, as in the technique described in Patent Document 3, in the configuration where the bonding is performed only between the end surface of the magnet and the peripheral wall on the opening side, or the configuration where the adhesive is injected from the groove, the bonding area is narrow, There is a problem that sufficient adhesive strength cannot be secured. Further, as in the technique described in Patent Document 4, after the adhesive is applied to the peripheral wall of the yoke, the magnet is moved in the axial direction along the peripheral wall of the yoke from the opening side of the yoke. Even if the groove is formed on the surface, it is not possible to avoid the adhesive becoming sparse on the opening side of the yoke, and there is a problem that sufficient adhesive strength cannot be secured.

  In view of the above problems, an object of the present invention is to provide a method for manufacturing a motor capable of ensuring sufficient fixing strength even when a magnet is fixed to an inner peripheral surface of a peripheral wall with an adhesive. .

  In order to solve the above problems, in the present invention, in a motor manufacturing method in which one or more magnets are fixed to an inner peripheral surface of a peripheral wall of a case or rotor having an opening on one end side in the axial direction, The first adhesive is applied to the outer peripheral surface of the magnet or the inner peripheral surface of the peripheral wall, and then the magnet is slid in the axial direction along the inner peripheral surface of the peripheral wall from the opening side. And a second adhesion between the first end face located on the opening side of the magnet and the inner peripheral face of the peripheral wall after the magnet is disposed at a predetermined position on the inner peripheral face of the peripheral wall. And a second step of applying the agent.

  In the present invention, the outer peripheral surface of the magnet is bonded and fixed to the inner peripheral surface of the peripheral wall by the first adhesive, and the first end surface of the magnet and the inner peripheral surface of the peripheral wall are first on the opening side of the peripheral wall. 2 is fixed with an adhesive. For this reason, since the adhesion area of a magnet and a surrounding wall is large, even when a magnet is fixed to the inner peripheral surface of a surrounding wall with an adhesive agent, sufficient fixing strength can be ensured.

  In the present invention, the magnet has a first concave portion that is recessed at least on the outer peripheral side in the axial direction on the first end surface or a first convex portion that protrudes in the axial direction at one or a plurality of locations. In the second step, it is preferable that the second adhesive is applied at least between the first concave portion or the first convex portion and the inner peripheral surface of the peripheral wall. If comprised in this way, compared with the case where there is no 1st recessed part or 1st convex part, since the length dimension (along track distance) of an outer periphery is long in the 1st end surface of a magnet, a magnet and a surrounding wall over a long distance Can be fixed with a second adhesive. Therefore, even when the magnet is fixed to the inner peripheral surface of the peripheral wall with an adhesive, a sufficient fixing strength can be ensured.

  In this case, the magnet has one or more second concave portions that are recessed in the axial direction at least on the outer peripheral side or a second convex portion that protrudes in the axial direction on the second end surface located on the side opposite to the opening. In the first step, it is preferable that the first adhesive is applied at a position overlapping at least the second concave portion or the second convex portion in the axial direction. If comprised in this way, compared with the case where there is no 2nd recessed part or a 2nd convex part, since the length dimension (along track distance) of an outer periphery is long in the 2nd end surface of a magnet, a magnet and a surrounding wall over a long distance Can be fixed with a first adhesive. Therefore, even when the magnet is fixed to the inner peripheral surface of the peripheral wall with an adhesive, a sufficient fixing strength can be ensured.

  Here, after applying each of the first adhesive and the second adhesive, they may be cured at once, but both the first adhesive and the second adhesive are heated. In the case of a curable resin, it is preferable that after the first adhesive is thermally cured in the first step, the second adhesive is thermally cured in the second step. If comprised in this way, when making the said 2nd adhesive agent thermoset at a said 2nd process, the thermosetting of a 1st adhesive agent can further be advanced.

  In the present invention, the outer peripheral surface of the magnet is bonded and fixed to the inner peripheral surface of the peripheral wall by the first adhesive, and the first end surface of the magnet and the inner peripheral surface of the peripheral wall are first on the opening side of the peripheral wall. 2 is fixed with an adhesive. For this reason, since the adhesion area of a magnet and a surrounding wall is large, even when a magnet is fixed to the inner peripheral surface of a surrounding wall with an adhesive agent, sufficient fixing strength can be ensured.

It is sectional drawing which shows the principal part of the motor to which this invention is applied. (A), (b) is the AA 'sectional view taken on the line of FIG. 1, and the BB' sectional view, respectively. (A), (b) is the perspective view when the magnet used for the motor shown in Drawing 1 is seen from the inner circumference side, and the perspective view when seen from the outer circumference side, respectively. (A)-(e) is explanatory drawing which shows the process of adhering and fixing a magnet to the internal peripheral surface of the surrounding wall of a case among the manufacturing processes of the motor which concerns on this invention. (A), (b), (c) is the perspective view when the magnet which concerns on the modification 1 of this invention is seen from the inner peripheral side, the perspective view when seen from the outer peripheral side, respectively, and its longitudinal cross-sectional view . (A), (b), (c) is the perspective view when the magnet which concerns on the modification 2 of this invention is seen from the inner peripheral side, the perspective view when seen from the outer peripheral side, respectively, and its longitudinal cross-sectional view . (A), (b), (c) is the perspective view when the magnet which concerns on the modification 3 of this invention is seen from the inner peripheral side, the perspective view when seen from the outer peripheral side, respectively, and its longitudinal cross-sectional view . (A), (b) is the perspective view when the magnet which concerns on the modification 4 of this invention is seen from the inner peripheral side, respectively, and the perspective view when seen from the outer peripheral side.

  Embodiments of the present invention will be described with reference to the drawings.

(overall structure)
1 is a cross-sectional view showing a main part of a motor to which the present invention is applied. FIGS. 2A and 2B are cross-sectional views taken along lines AA ′ and BB ′ in FIG. 1, respectively. is there. FIGS. 3A and 3B are a perspective view when the magnet used in the motor shown in FIG. 1 is viewed from the inner peripheral side and a perspective view when viewed from the outer peripheral side, respectively. In FIGS. 3A and 3B, positions corresponding to the outer peripheral edge of the recess formed in the magnet are indicated by bold lines.

  1 and 2 (a) and 2 (b), the motor 1 of this embodiment includes a case 3 having an opening 36 on one end side in the axial direction, and a lid attached to the opening 36 of the case 3. The material 4 includes two magnets 5 fixed to the inner peripheral surface 301 of the peripheral wall 30 of the case 3, and the rotor 2 whose outer peripheral surface faces the inner peripheral surface of these magnets 5. The rotor 2 includes a rotary shaft 20 extending in the axial direction, a rotor core 22 sandwiched and fixed from both sides in the axial direction by resin sleeves 61 and 62 with respect to the rotary shaft 20, and a coil 24 wound around the rotor core 22. And have. The rotary shaft 20 is rotatably supported by a radial bearing 38 disposed at the bottom of the case 3, and is rotatably supported by a radial bearing 42 and a thrust bearing 44 formed in the central hole of the lid member 4. Yes. In the rotating shaft 20, on the opening 36 side of the case 3, a commutator 63 is formed on the outer peripheral surface of the sleeve 62, and a brush 65 is in contact with the commutator 63. Note that the end of the coil wire drawn from the coil 24 is connected to a terminal on the sleeve 62.

  Here, the case 3 is made of a magnetic material so as to function as a yoke. Further, the case 3 has an oval, oval or elliptical cross-sectional shape when cut in a direction orthogonal to the axial direction, and the magnet 5 has the shape shown in FIGS. 2 (b) and 3 (a), As shown in (b), each of the two magnets 5 has an arc shape corresponding to the inner peripheral shape surface of the case 3 when cut in a direction orthogonal to the axial direction. As shown in FIG. 2A, the lid member 4 is formed with small protrusions 47 and 48 for press-fitting and fixing to the case 3. Note that the present invention can also be applied when the case 3 is circular when cut in a direction perpendicular to the axial direction.

  As shown in FIG. 1 and FIGS. 3A and 3B, the magnet 5 of the present embodiment includes a first end 51 that is recessed in the axial direction in the first end surface 51 located on the opening 36 side of the case 3. The recess 511 is formed in one place. Further, the magnet 5 is also formed with a second recess 521 that is recessed to a midway position in the axial direction on the second end surface 52 located on the opposite side to the opening 36 of the case 3.

  Here, the first concave portion 511 and the second concave portion 521 may be recessed in the axial direction at least on the outer peripheral side (the peripheral wall 30 side of the case 3). In this embodiment, the first concave portion 511 and the second concave portion 521 are provided. The recess 521 has a shape in which the entire magnet 5 in the thickness direction is removed.

(Magnet 5 fixing structure and fixing method)
4A to 4E are explanatory views showing a process of bonding and fixing a magnet to the inner peripheral surface of the peripheral wall of the case in the manufacturing process of the motor according to the present invention.

  The structure for fixing the magnet 5 to the peripheral wall 30 of the case 3 in the motor 1 of the present embodiment will be described while explaining the manufacturing method of the motor 1 of the present embodiment. Since the two magnets 5 have the same configuration and are fixed to the case 3 with the same structure, only one of them is shown in FIG. 4 and the other is omitted.

  In the manufacturing method of the motor 1 of this embodiment, in order to fix the magnet 5 to the peripheral wall 30 of the case 3, first, in the first step, as shown in FIG. 4A, the inner periphery of the peripheral wall 30 of the case 3. A first adhesive 81 made of an epoxy-based thermosetting resin is applied to the surface 301 in a spot shape. At that time, the first adhesive 81 is applied at a position overlapping at least the second recess 521 in the axial direction. Next, as shown in FIG. 4B, the magnet 5 is slid in the axial direction along the inner peripheral surface 301 of the peripheral wall 30 from the opening 36 side, and as shown in FIG. 5 is arranged at a predetermined position. As a result, the adhesive is pushed away by the second end surface 52 of the magnet 5 while being developed between the outer peripheral surface 501 of the magnet 5 and the inner peripheral surface 301 of the peripheral wall 30 of the case 3 together with the second end surface 52. Moving. Accordingly, when the first adhesive 81 is heat-cured, the magnet 5 has at least a part of the outer peripheral surface 501 fixed to the inner peripheral surface 301 of the peripheral wall 30 with the first adhesive 81 and the second end surface 52. On the side, the outer peripheral edge of the second recess 521 is fixed to the inner peripheral surface 301 of the peripheral wall 30 with the first adhesive 81.

  Next, in the second step, as shown in FIG. 4D, a second adhesive 82 made of a thermosetting resin such as an epoxy resin is applied from the opening 36 side to the inside of the first recess 511. After the application, the second adhesive 82 is thermally cured. As a result, as shown in FIG. 4E, the outer peripheral edge of the first recess 511 is fixed to the inner peripheral surface 301 of the peripheral wall 30 with the second adhesive 82.

(Main effects of this form)
As described above, in the motor 1 of this embodiment, a part of the outer peripheral surface 501 of the magnet 5 is bonded and fixed to the inner peripheral surface 301 of the peripheral wall 30 by the first adhesive 81 and the opening 36 of the peripheral wall 30 is provided. On the side, the first end surface 51 of the magnet 5 and the inner peripheral surface 301 of the peripheral wall 30 are fixed with a second adhesive 82. For this reason, even when the first adhesive 81 is sparse on the opening 36 side and dense on the side opposite to the opening 36, the end surface of the magnet 5 and the peripheral wall 30 on the opening 36 side of the peripheral wall 30. The inner peripheral surface 301 is fixed to the second adhesive 82. In addition, since the first concave portion 511 is formed on the first end surface 51 on the opening 36 side of the magnet 5, the length of the outer peripheral edge is longer on the end surface of the magnet 5 than when the first concave portion 511 is not provided. Since the length dimension (the distance along the line) is long, it is fixed with the second adhesive 82 over a long distance. Therefore, according to the present invention, even when the magnet 5 is fixed to the inner peripheral surface 301 of the peripheral wall 30 with an adhesive, a sufficient fixing strength can be ensured.

  In the present embodiment, the second end face 52 of the magnet 5 and the inner peripheral face 301 of the peripheral wall 30 are fixed by the first adhesive 81 on the side opposite to the opening 36 of the peripheral wall 30, and the first On the side of the second end surface 52, the outer peripheral edge of the second recess 521 is fixed to the inner peripheral surface 301 of the peripheral wall 30 with the first adhesive 81. For this reason, in this embodiment, since the length of the outer peripheral edge (the distance along the line) is longer than in the case where there is no second recess 521, the first adhesive 81 is fixed over a long distance. . Therefore, according to the present invention, even when the magnet 5 is fixed to the inner peripheral surface 301 of the peripheral wall 30 with an adhesive, a sufficient fixing strength can be ensured.

  Furthermore, in this embodiment, an epoxy thermosetting resin is used as the first adhesive 81 and the second adhesive 82, and after the first adhesive 81 is thermally cured in the first step, The second adhesive 82 is thermally cured in the process. For this reason, in order to further advance the thermosetting of the first adhesive 81 in the second step, even when the magnet 5 is fixed to the inner peripheral surface 301 of the peripheral wall 30 with an adhesive, a sufficient fixing strength is ensured. Can do.

  For the first adhesive 81 and the second adhesive 82, a method of collectively curing in the second step may be employed.

(Modification of magnet 5)
5 (a), 5 (b), and 5 (c) are a perspective view when the magnet according to Modification 1 of the present invention is viewed from the inner peripheral side, a perspective view when viewed from the outer peripheral side, and a longitudinal sectional view thereof, respectively. It is. 6 (a), 6 (b), and 6 (c) are respectively a perspective view when the magnet according to the second modification of the present invention is viewed from the inner peripheral side, a perspective view when viewed from the outer peripheral side, and a longitudinal sectional view thereof. It is. 7A, 7B, and 7C are a perspective view when a magnet according to Modification 3 of the present invention is viewed from the inner peripheral side, a perspective view when viewed from the outer peripheral side, and a longitudinal sectional view thereof, respectively. It is. 8A and 8B are a perspective view when the magnet according to Modification 4 of the present invention is viewed from the inner peripheral side and a perspective view when viewed from the outer peripheral side, respectively.

  In the above embodiment, the first concave portion 511 and the second concave portion 521 are formed so as to have a shape in which the entire thickness direction of the magnet 5 is removed, but FIG. 5 (a), (b), (c). As shown in FIG. 4, the bottom portions 511a and 521a perpendicular to the axial direction in the first recess 511 and the second recess 521 are tapered surfaces that are obliquely chamfered from the midway position in the thickness direction toward the outer peripheral side. It may be configured. If comprised in this way, the contact area of the magnet 5, the 1st adhesive agent 81, and the 2nd adhesive agent 82 can be increased. Moreover, since the clearance gap which accumulates an excess adhesive agent is formed between the internal peripheral surface 301 and the taper surface of the surrounding wall 30 of case 3, the protrusion of an adhesive agent etc. can be prevented.

  Further, in the first concave portion 511 and the second concave portion 521, the side portions 511b and 521b extending in the axial direction are tapered surfaces that are obliquely chamfered from an intermediate position in the thickness direction toward the outer peripheral side, Both the side portions 511b and 521b extending in the axial direction in the first concave portion 511 and the second concave portion 521 and the bottom portions 511a and 521a orthogonal to the axial direction are inclined obliquely from the middle position in the thickness direction toward the outer peripheral side. A chamfered tapered surface may be used.

  Also, as shown in FIGS. 6A, 6B, and 6C, a structure is adopted in which the entire outer peripheral edges of the first end surface 51 and the second end surface 52 of the magnet 5 are tapered surfaces by chamfering. May be.

  Furthermore, the first recess 511 and the second recess 521 may be recessed in the axial direction at least on the outer peripheral side (the peripheral wall 30 side of the case 3), so FIGS. ), By chamfering a part of the outer peripheral edge of the first end surface 51 and the second end surface 52 obliquely from the midway position in the thickness direction of the magnet 5 to the outer peripheral side, the first recess 511 and A second recess 521 may be formed.

  Here, when the first recess 511 and the second recess 521 are formed in the magnet 5, it is possible to ensure a long contact distance with the adhesive without extending the dimension in the axial direction. However, from the viewpoint of ensuring a long contact distance with the adhesive, as shown in FIGS. 8A and 8B, the first end surface 51 and the second end surface 52 of the magnet 5 are axially arranged. You may form the 1st convex part 512 and the 2nd convex part 522 which protruded.

(Other embodiments)
The present invention is suitable for fixing the magnet 5 to the inner peripheral surface 301 of the peripheral wall 30 of the member having the opening 36 on one end side in the axial direction. Although an example in which the magnet 5 is fixed to the peripheral surface 301 has been described, for example, in an outer rotor type motor, the present invention may be applied to a case where the rotor magnet is fixed to the inner peripheral surface of the peripheral wall of the rotor. Further, the present invention may be applied to a motor having one magnet or three or more magnets. Further, a plurality of concave portions and convex portions formed on the magnet may be formed.

DESCRIPTION OF SYMBOLS 1 Motor 2 Rotor 3 Case 4 Cover material 5 Magnet 20 Rotating shaft 24 Coil 30 Peripheral wall 36 Opening 38, 42 Radial bearing 51 First end surface 81 of magnet First adhesive 82 Second adhesive 301 Inner circumference of peripheral wall Surface 511 First concave portion 512 of magnet First convex portion 521 of magnet Second concave portion 522 of magnet Second convex portion of magnet

Claims (3)

In a motor manufacturing method in which one or more magnets are fixed to an inner peripheral surface of a peripheral wall of a case or a rotor having an opening on one end side in the axial direction,
The first adhesive is applied to the outer peripheral surface of the magnet or the inner peripheral surface of the peripheral wall, and then the magnet is slid in the axial direction along the inner peripheral surface of the peripheral wall from the opening side. And the process of
After the magnet is disposed at a predetermined position on the inner peripheral surface of the peripheral wall, a second adhesive is applied between the first end surface located on the opening side of the magnet and the inner peripheral surface of the peripheral wall. A method for manufacturing a motor, comprising: a second step. 2. The magnet according to claim 1, wherein the magnet has a first concave portion that is recessed at least on the outer peripheral side in the axial direction or a first convex portion that protrudes in the axial direction at one or a plurality of locations. ,
In the second step, the second adhesive is applied at least between the first concave portion or the first convex portion and the inner peripheral surface of the peripheral wall. 3. The magnet according to claim 1, wherein the magnet is provided with a second concave portion that is recessed at least on the outer peripheral side in the axial direction or a second convex portion that protrudes in the axial direction on the second end surface located on the side opposite to the opening. Form it in one or more places,
In the first step, the first adhesive is applied at least at a position overlapping the second concave portion or the second convex portion in the axial direction.

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