JP5983245B2 - Molded motor - Google Patents

Description

  The present invention relates to an inner rotor type molded motor.

  Conventionally, there is a molded motor in which an output-side bracket and a counter-output-side bracket are electrically connected by a conductive tape as a conductive member (see, for example, Patent Document 1). The conductive tape used for the mold motor is positioned between the output-side bracket and the non-output-side bracket, and is affixed to the side surface of the outer shell molded by the mold resin. The output-side bracket and the non-output-side bracket are each formed with a bearing house that accommodates a bearing.

  In such a molded motor, the output-side bracket and the non-output-side bracket are electrically connected by the conductive tape, so that the potential of the outer ring of the bearing housed in each bearing house becomes the same. For this reason, no current flows through the bearing, and it is possible to prevent the occurrence of electrolytic corrosion of the bearing. In addition, since the conductive tape is affixed to the side surface of the outer shell, it is not necessary to embed a conductive member in the mold resin, so that an advanced technique is not required at the time of molding. However, while conductive tape is easy to apply to the side of the outer shell, it may be cut or peeled off when the mold motor is transported or when the mold motor is mounted on an electrical device such as an air conditioner or deodorizer. is there. In addition, the conductive tape may be peeled off due to aging.

  The present applicant has proposed a technique shown in Japanese Patent Application No. 2011-218632 as a molded motor that solves the problem that the conductive tape is cut or peeled off. The mold motor includes a metal conductive plate that conducts between the output-side bracket and the non-output-side bracket. The conducting plate is press-fitted into the outer surface of the stator on the other end side and a first contact portion formed so as to be in contact with the side surface of the bearing house on the side opposite to the output side in a state of being warped away from the outer shape of the stator. A second abutting portion formed so as to abut on the inner side of the output-side bracket, and a conduction band connecting the first abutting portion and the second abutting portion.

  A holding means for holding the state where the first contact portion is in contact with the side surface of the bearing house on the opposite output side is formed on the outer periphery of the conductive plate and the stator. It consists of a hole formed in the conduction band and a protrusion formed on the outer end face of the stator. In this molded motor, the hole of the conductive plate is press-fitted into the protrusion, so that the first contact portion is held in contact with the side surface of the bearing house on the opposite output side, and the conductive tape Will not be cut or peeled off. However, the outer shell of the stator is formed of a mold resin, and the metal forming the conductive plate is harder than the outer shell of the stator. Therefore, when the hole is press-fitted into the protruding portion, the protruding portion is scraped, and the conductive plate There is a possibility that the state where the holes are press-fitted into the protrusions on the outer shell of the stator cannot be maintained.

JP 2007-20348 A (page 4, FIG. 1)

  In view of the above-described problems, the present invention prevents the conducting member from being cut or peeled off when conducting the conduction between the output side bracket and the non-output side bracket, while the conducting member is pressed into the outer shell of the stator. An object of the present invention is to provide a molded motor capable of maintaining the above.

  In order to solve the above problems, a molded motor according to the present invention includes a stator having a bottomed cylindrical outer shape formed by molding, a rotor that is rotatably disposed on the inner diameter side of the stator and has an output rotation shaft, and an output rotation A bearing that supports the output side and the non-output side of the shaft, a conductive bracket that is formed on both the output side and the non-output side of the outer shell in which a bearing house that accommodates the bearing is formed, and an output side bracket; And a metal conduction plate that conducts the non-output side bracket. The outer shell has a protrusion on the end surface where one bracket is disposed, and the conductive plate abuts the side surface of the bearing house formed on the one bracket on one end side in a state of warping away from the end surface of the outer shell. A first abutting portion formed as described above, a second abutting portion formed so as to abut on the inside of the other bracket press-fitted to the other end side, and a first abutting portion and a second abutting portion. It consists of a conduction band that connects the contact part. A through hole for inserting the protrusion is provided on the first contact portion side of the conduction band, and a protruding piece that protrudes from the inner wall surface is provided on the inner wall surface of the through hole. The protrusion is sandwiched between the wall surface and the protruding piece.

  According to the molded motor of the present invention, since the conductive plate is made of metal, it can be prevented from being cut like a conductive tape. Further, on the first contact portion side of the conduction band of the conduction plate, there is provided a through hole for inserting a protruding portion on the end surface of the outer wall where one bracket is arranged, and the inner wall surface of the through hole has Protruding pieces projecting from the inner wall surface are provided, and the projecting portion is sandwiched between the inner wall surface facing the projecting piece and the projecting piece, so that the projecting portion can be scraped when inserted into the through hole. Can be prevented. Further, the conductive plate can maintain the state where the protrusion is inserted into the through hole by sandwiching the protrusion between the inner wall surface facing the protrusion and the protrusion, thus preventing the conductive plate from coming off the outer shell of the stator. be able to.

It is explanatory drawing which shows the mold motor by this invention, (a) is the schematic perspective view seen from the output side, (b) is the schematic perspective view seen from the non-output side. 1 is a schematic exploded perspective view showing a molded motor according to the present invention. It is an AA schematic sectional drawing shown to Fig.1 (a) of the molded motor by this invention. It is explanatory drawing which shows the 1st contact part and the vicinity of a through-hole, (a) is an expanded sectional view, (b) is an enlarged plan view which shows the vicinity of a through-hole. It is explanatory drawing which shows the vicinity of a 1st contact part, and is a schematic enlarged plan view corresponding to FIG. It is explanatory drawing which shows the 1st contact part and the vicinity of a through-hole, (a) is an expanded sectional view, (b) is an enlarged plan view which shows the vicinity of a through-hole. It is explanatory drawing which shows the vicinity of a 1st contact part, and is a schematic enlarged plan view corresponding to FIG. It is explanatory drawing which shows the vicinity of a conduction plate and a 2nd contact part, (a) is a perspective view which shows the conduction plate for demonstrating a 2nd contact part, (b) is the 2nd contact shown to (a). It is an expansion perspective view which shows the state in which the part was stored in the groove part.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 10 are views for explaining a molded motor according to this embodiment. As shown in FIGS. 1 to 3, the molded motor 100 includes a stator core 10, an outer shell 20, a rotor 30, an output-side bearing 41 and a counter-output-side bearing 42, an output-side bracket 51 and a counter-output. A side bracket 52 and a conductive plate 60 are provided.

  The stator core 10 is configured by laminating steel plates, and includes an annular yoke portion and a plurality of teeth portions 11 extending from the yoke portion toward the inner diameter side. An insulator 12 is formed by pre-molding the stator core 10, and a winding 13 is wound around the tooth portion 11 via the insulator 12. The stator core 10 around which the windings 13 are wound is molded with a mold resin except for the inner peripheral surface to form a cylindrical outer shell 20, thereby forming a stator. A metal bracket 52 made of a galvanized steel plate is integrally embedded on the opposite output side of the outer shell 20. The bracket 52 on the non-output side is in a state where the bearing house 520 in which the bearing 42 on the non-output side is accommodated is exposed from the outer shell 20.

  The rotor 30 includes an output rotating shaft 31 and a permanent magnet 32 having a plurality of magnetic poles. The magnetic poles of the permanent magnet 32 are arranged around the output rotation shaft 31 so as to be opposite magnetic poles at equal intervals and alternately adjacent to each other N and S, and are integrated with the output rotation shaft 31. The permanent magnet 32 can be formed as a ferrite-bonded magnet by mixing a ferrite magnetic material into a resin material and magnetizing it. The rotor 30 is accommodated oppositely with a predetermined gap (gap) inside the inner periphery of the stator core 10. The permanent magnet 32 is not limited to this, and a rare earth magnet may be used instead of the ferrite magnet, and a sintered magnet may be used instead of the bonded magnet.

  The output rotating shaft 31 is rotatably supported by passing through an output-side bearing 41 and a non-output-side bearing 42. The output-side bearing 41 and the non-output-side bearing 42 are ball bearings, and include a ball 400 as a rolling element, an inner ring 401, and an outer ring 402.

  1, 2, and 3, the output-side bearing 41 is accommodated in an output-side bearing house 510 formed on a metal output-side bracket 51 made of a galvanized steel plate. The output side bracket 51 is fitted to the output side surface of the outer shell 20.

  In FIG. 1, one end side of the conduction plate 60 is in contact with the bearing house 520 on the counter-output side, and the other end side is in contact with the bracket 51 on the output side. Hereinafter, the conductive plate 60 will be described in detail. In FIG. 1, FIG. 2, and FIG. 3, the conduction plate 60 is made of a belt-like metal plate having conductivity, springiness, and rigidity, and is made of a material made of stainless steel having these properties. The conductive plate 60 may be made of a material made of iron, steel, brass, phosphor bronze, or the like as long as it has conductivity, springiness, and rigidity. The conductive plate 60 connects the first contact portion 61 formed on one end side, the second contact portion 62 formed on the other end side, and the first contact portion 61 and the second contact portion 62. And a conduction band 63 is provided. The conduction band 63 is bent halfway and has a substantially L-shape as a whole as shown in FIG. Specifically, the outer wall 20 is bent along the opposite end face of the outer shell 20 and the side surface of the outer shell 20. A groove portion 22 in which the conduction plate 60 is accommodated is provided on the end face of the outer shell 20 on the side opposite to the output side and the side surface of the outer shell 20.

  In FIG. 1 and FIG. 3, the bearing house 520 on the non-output side is formed in a bottomed cylindrical shape by, for example, pressing. The bearing 42 is accommodated inside the bearing house 520 on the non-output side, and the first contact portion 61 formed on one end side of the conductive plate 60 is arranged on the outside in a direction away from the end surface on the counter-output side of the outer shell 20. Abutted in a warped state. On the other hand, the second abutting portion 62 formed on the other end side of the conduction plate 60 contacts the inside of the output side bracket 51 with the output side bracket 51 being press-fitted into the output side surface of the outer shell 20. It is touched.

  4 and 5 show an enlarged view of the vicinity of the first contact portion 61 and the through hole 630. In FIG. 4 and FIG. 5, the conductive plate 60 has the first contact portion 61 in contact with the outer side surface of the bearing house 520 on the non-output side, and the conductive band 63 is accommodated in the groove portion 22. Since the conductive plate 60 is accommodated in the groove portion 22, it can be positioned in the circumferential direction with respect to the outer shell 20. Anti-vibration rubber 70 is attached to the outer periphery of bearing house 520 on the non-output side. For example, when the mold motor 100 is mounted on an air conditioner, the vibration isolating rubber 70 reduces vibration transmitted from the mold motor to the air conditioner. The anti-vibration rubber 70 has a chamfered portion 71 at a corner adjacent to the first contact portion 61. By forming the chamfered portion 71 on the anti-vibration rubber 70, when the anti-vibration rubber 70 is attached to the outer periphery of the bearing house 520, the first abutment portion 61 is caught by the anti-vibration rubber 70, and the bearing house 520 It is possible to prevent poor contact with the outer side surface. Since the first contact portion 61 is covered with the anti-vibration rubber 70, it is possible to prevent the operator's finger or the like from coming into contact with the first contact portion 61. The anti-vibration rubber 70 is also attached to the outer periphery of the output-side bearing house 510 (not shown).

  The outer shell 20 is provided with a projecting portion 220 in a groove portion 22 formed on an end surface where the opposite-output-side bracket 52 is disposed. The protrusion 220 is formed in a rectangular shape along the groove 22. In addition, the conduction plate 60 is provided with a through hole 630 for inserting the protrusion 220 on the first contact portion 61 side of the conduction band 63. On the inner wall surface 633 of the through hole 630 on the second contact portion 62 side, a projecting piece 634 having a spring property that protrudes from the inner wall surface 633 toward the center of the through hole 630 is provided. The through-hole 630 is formed in a substantially rectangular shape along the longitudinal direction of the conduction band 63, and is larger than the protrusion 220 so that the protrusion 220 can be held between the inner wall 635 and the protrusion 634 facing the protrusion 634. It is getting bigger. The conductive plate 60 is configured such that the conductive band 63 is accommodated in the groove portion 22 and the protruding portion 220 is inserted into the through hole 630 by sandwiching the protruding portion 220 between the inner wall surface 635 and the protruding piece 634 facing the protruding piece 634. Is maintained.

  As a result, the contact state of the first contact portion 61 with the outer side surface of the bearing house 520 on the non-output side is maintained, so that the conduction plate 60 can be prevented from coming off from the groove portion 22. In addition, since the metal conduction plate 60 is used, it is not cut like a conductive tape. Further, when the protrusion 220 is inserted into the through hole 630, the protrusion 634 is deformed due to the spring property, so that the protrusion 220 made of mold resin is not cut by the metal through hole 630 and protrudes from the inner wall surface 635. The protrusion 220 can be held between the piece 634. Furthermore, since the protruding piece 634 is provided on the inner wall surface 633 of the through hole 630 on the second contact portion 62 side, when the inner wall surface 635 is brought into contact with the protrusion 220, the first contact portion 61 is moved to the non-output side. Therefore, the contact state of the first contact portion 61 with respect to the bearing house 520 on the non-output side can be improved. Further, as shown in FIG. 4, the protrusion 220 has a prismatic shape having a rectangular top surface 2201 whose length direction is longer than the width direction, and against the force in the length direction acting on the protrusion 220. Strength can be increased. Thereby, it is possible to prevent the protrusion 220 from being damaged when the protrusion 220 is sandwiched between the inner wall surface 635 and the protrusion 634. Furthermore, since the width L1 of the protrusion 220 is formed to be smaller than the width L2 of the protrusion 634, the protrusion 634 can be brought into contact with the protrusion 220 more reliably.

  In FIG. 5, the front end portion 610 of the first contact portion 61 is formed in an arc shape along the outer side surface of the bearing house 520 on the counter-output side. Since the front end portion 610 is formed in an arc shape, the first abutting portion 61 has a large abutting area with the outer side surface of the bearing house 520 on the counter-output side and can surely abut. In addition, the shape of the front-end | tip part 610 of the 1st contact part 61 is not restricted to circular arc shape, You may form in linear form.

  6 and 7 show an enlarged view of the vicinity of the first contact portion 61 and the through hole 636 according to another embodiment. The same parts as those in the embodiment according to FIGS. 4 and 5 are denoted by the same reference numerals, and the description thereof is omitted. 6 and 7, the conduction plate 60 is provided with a bent portion 631 formed in an L shape in the conduction band 63 continuously to the first contact portion 61. Further, a groove portion 80 into which the bent portion 631 is press-fitted is provided between the outer shell 20 and the bearing house 520 on the opposite output side. The groove portion 80 is formed with a stepped portion 27 facing the outer side surface of the bearing house 520 on the counter-output side on the inner diameter side of the end surface where the bracket 52 on the counter-output side of the outer shell 20 is disposed. An annular groove is formed outside 520. On the other hand, the bent portion 631 is bent along the stepped portion 27 continuously to the first abutting portion 61, and from the first abutting portion 61 to the bent portion 631, as shown in FIG. The cross-sectional shape is a downward substantially convex shape that matches the groove 80. When the bent portion 631 is press-fitted into the groove portion 80, the contact state of the first contact portion 61 with the outer side surface of the bearing house 520 on the non-output side is well maintained.

  Further, the outer shell 20 has a protruding portion 221 in a groove portion 22 formed on an end surface where the opposite-output-side bracket 52 is disposed. The protrusion 221 is formed in a rectangular shape in the width direction of the groove 22. Further, the conduction plate 60 is provided with a through hole 636 for inserting the protrusion 221 on the first contact portion 61 side of the conduction band 63. On the inner wall surface 637 of the through hole 636 along the length direction of the conduction band 63, a projecting piece 638 having a spring property that protrudes from the inner wall surface 637 toward the center of the through hole 636 is provided. The through-hole 636 is formed in a substantially rectangular shape along the longitudinal direction of the conduction band 63, and more than the protrusion 221 so that the protrusion 221 can be sandwiched between the inner wall surface 639 and the protrusion 638 facing the protrusion 638. It is getting bigger. In the conductive plate 60, the protruding portion 221 is sandwiched between the inner wall surface 639 facing the protruding piece 638 and the protruding piece 638, so that the conductive band 63 is accommodated in the groove portion 22, and the protruding portion 221 is inserted into the through hole 636. Is maintained.

  Further, when the protruding portion 221 is inserted into the through hole 636, the protruding piece 638 is deformed due to the spring property, so that the protruding portion 221 is not cut by the through hole 636, and the protruding portion 221 is formed by the inner wall surface 639 and the protruding piece 638. Can be pinched. In addition, since the protruding piece 638 is provided on the inner wall surface 637 of the through hole 636 along the length direction of the conduction band 63, the protruding portion 221 is penetrated while maintaining the state where the bent portion 631 is press-fitted into the groove portion 80. Since the state inserted in the hole 636 can be maintained, it is possible to prevent the conductive plate 60 from being detached from the groove portion 22. Further, as shown in FIG. 6, the protrusion 221 has a prismatic shape having a rectangular top surface 2211 whose width direction is longer than the length direction, and is strong against the force in the width direction acting on the protrusion 221. Can be high. Thereby, it can prevent that the projection part 221 will be damaged like the above-mentioned embodiment. Further, since the width L3 of the protruding portion 221 is formed to be smaller than the width L4 of the protruding piece 638, the protruding piece 638 can be brought into contact with the protruding portion 221 more reliably. Furthermore, as shown in FIG. 6B, a space is provided between the through hole 636 and the protrusion 221 in the length direction of the conduction band 63. For example, even if a relative positional deviation occurs between the through hole 636 and the protrusion 221 due to a manufacturing error due to this space, the bent portion 631 is held in the groove 80 while the protrusion 221 is held between the inner wall surface 639 and the protrusion 638. Can be securely pressed into

  FIG. 8 shows the conductive plate 60 and the vicinity of the second contact portion 62 that is in contact with the output-side bracket 51. FIG. 8B shows the output side bracket 51 removed from the outer shell 20. In FIG. 8, a step 23 is provided on the output side of the side surface 21 of the outer shell 20, and an output-side bracket 51 is press-fitted into the step 23 and fitted therein. The conduction band 63 of the conduction plate 60 is accommodated in the groove portion 22 formed on the side surface 21 of the outer shell 20. The groove portion 22 is also formed from the step 23 to the output side end surface 24 of the outer shell 20, and the output side end surface 24 has a groove 25 formed in a direction orthogonal to the side surface 21.

  The second abutment portion 62 is bent so that a joint portion 620 joined to the groove portion 22 formed from the step 23 to the output side end surface 24 of the outer shell 20, and a tip from the joint portion 620 so as to follow the output side end surface 24 of the outer shell 20. And a front end portion 621 provided so as to rise from the output side end surface 24 in the direction along the groove portion 22. Between the joint part 620 and the front-end | tip part 621, the latching | locking part 622 latched by the output side end surface 24 is provided. The distal end portion 621 and the locking portion 622 of the second contact portion 62 are accommodated in the groove 25 formed in the output side end surface 24. Since the distal end portion 621 is warped in the direction along the groove portion 22, the distal end portion 621 is accommodated in the groove 25 on the output side end surface 24 while being shifted along the groove portion 22 formed from the step 23 of the outer shell 20 to the output side end surface 24. At this time, the force applied to the tip portion 621 can be released in the direction along the groove portion 22 and can be easily moved. The joint portion 620 of the second contact portion 62 is formed with a cut-and-raised portion 623 that is joined to the inner peripheral surface of the output-side bracket 51 so as to protrude from the groove portion 22 toward the outer diameter side of the outer shell 20. It has been cut up. When the cut-and-raised portion 623 is formed in this way, the joint portion 620 is joined to the groove portion 22, and when the cut-and-raised portion 623 is joined to the output-side bracket 51, the second contact portion with respect to the output-side bracket 51. The contact state of 62 can be ensured.

  According to the molded motor 100 of the present invention described above, the output-side bracket 51 and the non-output-side bracket 52 are electrically connected by the first contact portion 61 and the second contact portion 62 of the conductive plate 60, and output. The potentials of the outer ring 402 of the bearing 41 housed in the bearing house 510 on the side and the outer rings 402 of the bearing 42 housed in the bearing house 520 on the opposite output side are the same. For this reason, current does not flow through the output-side bearing 41 and the counter-output-side bearing 42, and the occurrence of electrolytic corrosion of the output-side bearing 41 and the counter-output-side bearing 42 can be prevented.

  In the molded motor 100 according to the present embodiment, the protrusions 220 and 221 are provided on the end surface of the outer shell 20 on which the bracket 52 on the counter-output side is disposed, and the first contact is made on the outer side surface of the bearing house 520 on the counter-output side. The second abutting portion 62 is abutted on the inside of the output-side bracket 51 press-fitted into the outer shell 20, but the present invention is not limited to this, and the output-side bracket is arranged. In addition to having a protrusion on the end surface of the outer shell 20, the first contact portion 61 is in contact with the outer side surface of the output-side bearing house, and the second contact portion 62 is disposed on the inner side of the non-output-side bracket that is press-fitted into the outer shell 20. You may make it contact | abut.

  Further, in the molded motor 100 according to the present embodiment, the protruding piece 634 that protrudes from the inner wall surface 633 of the through hole 630 on the second contact portion 62 side toward the center of the through hole 630 is provided. However, the present invention is not limited thereto, and a protruding piece that protrudes from the inner wall surface 635 of the through hole 630 on the first contact portion 61 side toward the center of the through hole 630 may be provided. Furthermore, although the protrusion 638 protruded from the inner wall surface 637 of the through hole 636 along the length direction of the conduction band 63 toward the center of the through hole 636 is provided, the present invention is not limited to this, and A protruding piece protruding from the inner wall surface 639 of the through hole 636 along the length direction of the band 63 toward the center of the through hole 636 may be provided.

DESCRIPTION OF SYMBOLS 10 Stator core 11 Teeth part 12 Insulator 13 Winding 20 Outer side 21 Side 22 Groove part 220, 221 Projection part 2201, 2111 Top surface 23 Step 24 Output side end face 25 Groove 27 Step part 30 Rotor 31 Output rotating shaft 32 Permanent magnet 400 Ball 401 Inner ring 402 Outer ring 41 Output-side bearing 42 Non-output-side bearing 51 Output-side bracket 510 Output-side bearing house 52 Anti-output-side bracket 520 Non-output-side bearing house 60 Conducting plate 61 First contact portion 610 Tip portion 62 Second contact portion 620 Joint portion 621 Tip portion 622 Locking portion 623 Cut and raised portion 63 Conductive band 630, 636 Through hole 631 Bending portion 633, 635, 637, 639 Inner wall surface 634, 638 Protruding piece 70 Anti-vibration rubber 71 Chamfered part 80 Groove part L1 Width of protrusion 220 L2 Width of protrusion 634 L3 Width of protrusion 221 L4 Width of protrusion 638

Claims (3)

A stator having a bottomed cylindrical shell formed by molding;
A rotor that is rotatably arranged on the inner diameter side of the stator and has an output rotation shaft;
A bearing that supports the output side and the non-output side of the output rotation shaft;
A conductive bracket that is formed on both the output side and the non-output side of the outer shell in which a bearing house is formed to accommodate the bearing,
A metal conduction plate for conducting the output side bracket and the non-output side bracket;
The outer shell has a protrusion on the end surface on which one of the brackets is disposed,
The conductive plate has a first contact portion formed so as to contact a side surface of the bearing house formed in one of the brackets on one end side in a state of warping in a direction away from the end surface of the outer shell,
A second abutting portion formed to abut on the inner side of the other bracket press-fitted into the outer shell on the other end side;
A conductive band connecting the first contact portion and the second contact portion;
A through hole for inserting the protrusion is provided on the first contact portion side of the conduction band,
A mold motor characterized in that a projecting piece projecting from the inner wall surface is provided on the inner wall surface of the through hole, and the projecting portion is sandwiched between the inner wall surface facing the projecting piece and the projecting piece.   2. The molded motor according to claim 1, wherein the projecting piece is disposed on an inner wall surface on the second contact portion side of an inner wall surface forming the through hole. The conductive plate is formed with an L-shaped bent part continuously to the first contact part,
A groove is formed between the outer shell and one of the bearing houses so that the bent portion is press-fitted,
2. The molded motor according to claim 1, wherein the projecting piece is disposed on an inner wall surface along a length direction of the conduction band among the inner wall surfaces forming the through hole.

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