JP2014103801A - Mold motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure stable contact between a conductive member and a bearing house while improving material yield of the conductive member by preventing the conductive member from being cut or exfoliated when conducting an output-side bracket and an anti-output-side bracket by means of the conductive member.SOLUTION: A metallic conductive plate 60 for conducting an output-side bracket 51 and an anti-output-side bracket 52 comprises: a first abutment part 61 which is formed at one end side so as to be abutted to a side face of an anti-output-side bearing house 520 while being warped away from an outline 20; a second abutment part which is formed at the other end side so as to be abutted to the inside of the output-side bracket 51 which is press-fitted to the outline 20; and a conductive band connecting the first abutment part 61 and the second abutment part. The first abutment part 61 includes a distal end portion which is formed arcuate along the side face of the anti-output-side bearing house 520.

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.

  As a molded motor that solves the problem that the conductive tape is cut or peeled off, there is one in which the output-side bracket and the non-output-side bracket are made to conduct with a metal conductive plate (for example, Patent Document 2). This conductive plate is in contact with the inner side of the annular part formed so as to be fitted to the side surface of the bearing house on the opposite side to the output side on one end side and the bracket on the output side that is press-fitted into the outer shell of the stator on the other side. And a conduction band that connects the annular portion and the contact portion.

  In this molded motor, the conductive plate is held in a state where the output-side bracket and the non-output-side bracket are conductive, so that the conductive plate is not cut or peeled off like the conductive tape. However, since an annular portion is formed on one end side of the conductive plate, there are many scraps discarded when the conductive plate is cut off by press working, resulting in poor material yield.

JP 2007-20348 A JP 2012-210064 A

  In view of the above problems, the present invention prevents the conductive member from being cut or peeled when the output side bracket and the non-output side bracket are connected by the conductive member, and the material yield of the conductive member is reduced. It aims at providing the mold motor which can ensure the stable contact of a conduction member and a bearing house, improving.

  In order to solve the above-described problems, a molded motor of the present invention includes a stator that is molded with a mold resin to form a bottomed cylindrical outer shell, a rotor that is rotatably disposed on the inner diameter side of the stator, 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 wall in which a bearing house for housing the bearing is formed, and an output side bracket And a metal conductive plate that conducts the bracket on the non-output side. The conducting plate is press-fitted into the outer shell on the other end side, with a first abutting portion formed so as to abut on the side of the bearing house on the output side or the non-output side on one end side in a state of warping away from the outer shell. A second abutting portion formed so as to abut on the inner side of the output-side or counter-output-side bracket, and a conduction band connecting the first abutting portion and the second abutting portion. The first contact portion has a tip portion formed in an arc shape along the side surface of the bearing house.

  According to the molded motor of the present invention, the first contact portion of the metal conductive plate is in contact with the side of the bearing house on the output side or the non-output side, so that it is prevented from being cut or peeled off like a conductive tape. can do. Further, since the conductive plate is composed of a band-shaped conductive band, there are few scraps discarded when the conductive plate is cut off by press working, and the material yield can be improved. Furthermore, since the tip of the first contact portion is formed in an arc shape along the side surface of the bearing house, stable contact between the tip portion of the first contact portion and the side surface of the bearing house can be ensured.

It is explanatory drawing which shows the mold motor by this invention, (a) is the perspective view seen from the output side, (b) is the perspective view seen from the non-output side. It is a disassembled perspective view which shows the mold motor by this invention. It is AA sectional drawing shown to Fig.1 (a) of the molded motor by this invention. It is an expanded sectional view showing the neighborhood of the 1st contact part and a holding means. FIG. 5 is an enlarged plan view corresponding to FIG. 4. It is explanatory drawing which shows the front-end | tip part of the 1st contact part formed in linear form, (a) is an enlarged view which shows the state which the front-end | tip part of the 1st contact part contacted the bearing house side surface on the non-output side without a horizontal shift. FIG. 4B is an enlarged plan view showing a state in which the tip end portion of the first contact portion is in contact with the side surface of the bearing house on the counter-output side while being shifted laterally. It is explanatory drawing which shows the state which the front-end | tip part of the 1st contact part formed in circular arc shape contacted the bearing house side surface on the non-output side without a horizontal shift, (a) is a bearing with the curvature radius of a front-end | tip part on the non-output side. (B) is an enlarged plan view when the radius of curvature of the tip is equal to the radius of curvature of the bearing house side on the non-output side, and (c) is the curvature of the tip. It is an enlarged plan view in case a radius is larger than the curvature radius of the bearing house side surface of the counter-output side. It is explanatory drawing which shows the state which the front-end | tip part of the 1st contact | abutting part formed in circular arc shape contacted and shifted | deviated laterally to the bearing house side of the non-output side, (a) shows the front-end | tip part of Fig.7 (a). FIG. 8B is an enlarged plan view, FIG. 7B is an enlarged plan view showing the tip portion of FIG. 7B, and FIG. 8C is an enlarged plan view showing the tip portion of FIG. It is an expanded sectional view which shows the other Example of the front-end | tip part of the 1st contact part formed in circular arc shape.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 9 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 integrally formed on the stator core 10 by molding, 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. The insulator 12 may be formed separately and attached to the stator core 10 instead of being formed integrally with the stator core 10. 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 at an equal interval, and adjacent magnetic poles are arranged around the output rotation shaft 31 so that N poles and S poles appear alternately, 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 housed 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 in contact with the outside in a state of warping away from the outer shell 20. Has been. 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 the vicinity of the first contact portion 61 in an enlarged manner. 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. 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 conductive plate 60 and the outer shell 20 are formed with holding means 90 that holds the first contact portion 61 in contact with the outer side surface of the bearing house 520 on the counter-output side. The holding means 90 is configured by combining the first holding portion provided on the conductive plate 60 and the second holding portion provided on the outer shell 20 with each other. 4 and 5, the conduction plate 60 includes a first contact portion 61 and a bent portion formed on the conduction band 63 on the outer diameter side of the first contact portion 61 as the first holding portion. 631 is formed. In addition, by combining the bearing house 520 on the non-output side and the outer shell 20, a groove 80 formed between the outer side surface of the bearing house 520 on the non-output side and the stepped portion 27 is provided as the second holding portion. Yes.

  The groove 80 is formed in an annular shape on the outer diameter side of the bearing house 520 on the counter-output side by the bearing house 520 on the counter-output side and the stepped portion 27 formed on the inner diameter side of the end face on the counter-output side of the outer shell 20. Is formed. On the other hand, the convex portion 632 of the conductive plate 60 is bent so that the bent portion 631 is along the stepped portion 27, and is connected to the first contact portion 61 on the inner diameter side of the bent portion 631. The part 61 is bent in a direction opposite to the bending direction of the bent part 631, thereby forming a substantially convex cross section. As a result, the convex portion 632 is press-fitted into the groove portion 80, so that the contact state of the first contact portion 61 with the outer side surface of the bearing house 520 on the counter-output side is maintained.

  In FIG. 4, the dimension of the thickness t of the conduction plate 60 is, for example, about 0.4 mm, and the dimension of the depth d of the groove 22 is larger than the dimension of the thickness t of the conduction plate 60. It has become. For this reason, since the conduction plate 60 does not protrude from the end face on the opposite side of the outer shell 20 or the side surface of the outer shell 20, even if an operator's finger approaches the groove portion 22, the finger is not caught by the conduction plate 60 and the groove portion 22. It is possible to prevent the conduction plate 60 from coming off. Furthermore, in FIG. 5, the dimension of the width W of the conduction plate 60 is sufficiently smaller than the dimension of the diameter D of the bearing house 520 on the non-output side, and the tip 610 included in the first contact part 61 is It is formed in an arc shape along the outer side surface of the bearing house 520 on the counter-output side.

  Next, the contact state between the arcuate tip 610 of the first contact portion 61 and the side surface of the bearing house 520 on the counter-output side will be described with reference to FIGS. 6 to 8. FIG. 6A shows a side surface of the bearing house 520 with the straight tip 610 so that the central axis C of the bearing house 520 on the opposite output side intersects with the extension of the center line L of the conductive plate 60. The state in contact with is shown. FIG. 7 shows a state in which the arcuate tip 610 is in contact with the side surface of the bearing house 520 so that the center axis C of the bearing house 520 on the non-output side intersects the extension of the center line L of the conduction plate 60.

  The arcuate tip 610 has a curvature radius R1 smaller than the curvature radius R2 of the side surface of the bearing house 520 on the opposite output side as shown in FIG. 7A, and as shown in FIG. The radius of curvature R1 equal to the radius of curvature R2 of the side surface of the bearing house 520 on the non-output side is larger than the radius of curvature R2 of the side surface of the bearing house 520 on the counter-output side as shown in FIG. There are three patterns of what consists of R1.

  As shown in FIG. 6A, the straight tip 610 is in one-point contact with the side surface of the bearing house 520 on the opposite output side, but the arc tip is smaller in the radius of curvature R1 than the radius of curvature R2. As shown in FIG. 7A, 610 is in two-point contact with the side surface of the bearing house 520 on the counter-output side, so that a more stable contact is ensured than the linear tip 610. Similarly, the arcuate tip 610 having a radius of curvature R1 equal to the radius of curvature R2 is in contact with the side of the bearing house 520 on the opposite output side as shown in FIG. Stable contact is ensured. Further, the arcuate tip 610 having a radius of curvature R1 larger than the radius of curvature R2 is in contact with the side surface of the bearing house 520 on the counter-output side at a part of the arc as shown in FIG. The tip 610 is disposed so as to cover the side surface of the bearing house 520 on the opposite output side, so that a more stable contact is ensured than the straight tip 610.

  FIG. 8 shows a case where the conductive plate 60 is laterally displaced in the tangential direction of the outer periphery of the bearing house 520 between the opposite side of the bearing house 520 due to manufacturing variations and assembly errors of the molded motor 100. That is, the central axis C of the bearing house 520 on the non-output side does not intersect the extension of the center line L of the conductive plate 60, and the arcuate tip 610 is in contact with the side surface of the bearing house 520 on the non-output side. . In FIG. 8, among the three patterns of the arcuate tip 610, the arcuate tip 610 having a curvature radius R1 larger than the curvature radius R2 of the side surface of the bearing house 520 on the counter-output side is the bearing on the counter-output side. Stable contact with the side surface of the house 520 is ensured.

  Specifically, when the radius of curvature R1 of the tip 610 is smaller than the radius of curvature R2, as shown by a circle in FIG. 8A, the tip of the tip 610 with respect to the side surface of the bearing house 520 on the non-output side. One-point contact at one side corner. Even when the radius of curvature R1 of the tip 610 is equal to the radius of curvature R2, as shown by the circle b in FIG. 8B, the one-side corner of the tip 610 with respect to the side surface of the bearing house 520 on the counter-output side. 1 point contact at. Therefore, the contact state becomes unstable and unbalanced. On the other hand, when the radius of curvature R1 of the tip 610 is larger than the radius of curvature R2, when the conduction plate 60 is laterally displaced in the tangential direction of the outer periphery of the bearing house 520 on the opposite output side, the circle c in FIG. As shown, the contact is made at the part of the arc of the tip 610 with respect to the side surface of the bearing house 520 on the non-output side. However, since the tip portion 610 is disposed so as to cover the side surface of the bearing house 520 on the counter-output side, stable contact is ensured by contact between the arc-shaped surfaces of the bearing house 520 on the counter-output side and the tip portion 610. The Note that, as shown in FIG. 6B, the arcuate tip 610 in which the radius of curvature R1 is larger than the radius of curvature R2 is between the linear tip 610 and the side surface of the bearing house 520 on the non-output side. Compared to the case where the bearing house 520 is laterally displaced in the tangential direction of the outer periphery, stable contact is ensured with respect to the side surface of the bearing house 520 on the non-output side.

  According to the molded motor 100 according to the embodiment described above, the output-side bracket 51 and the non-output-side bracket 52 are electrically connected by the conductive plate 60, and the outer ring 402 of the bearing 41 accommodated in the output-side bearing house 510. The potentials of the outer rings 402 of the bearings 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. Further, since the first contact portion 61 of the metal conductive plate 60 contacts the outer side surface of the bearing house 520 on the opposite output side, it can be prevented from being cut or peeled off like a conductive tape. . Further, since the conductive plate 60 is formed of the rectangular conductive band 63, there are few scraps discarded when the conductive plate 60 is cut off by press working, and the material yield can be improved. Furthermore, since the tip 610 of the first contact portion 61 is formed in an arc shape along the side surface of the bearing house 520 on the counter-output side, the tip portion 610 of the first contact portion 61 and the counter-output-side side Stable contact with the side surface of the bearing house 520 can be ensured.

  Further, when the curvature radius R1 of the tip 610 of the first contact portion 61 is larger than the curvature radius R2 of the side surface of the bearing house 520 on the opposite output side, the conductive plate 60 is manufactured and assembled in the mold motor 100. Stable contact between the tip portion 610 of the first contact portion 61 and the side surface of the bearing house 520 on the non-output side even if the error causes a misalignment with the side surface of the bearing house 520 on the counter-output side. Can be secured.

  In the molded motor 100 according to the present embodiment, the first contact portion 61 formed on the conductive plate 60 is in contact with the outer side surface of the bearing house 520 on the counter-output side, but the present invention is not limited to this. The first contact portion 61 may be in contact with the outer side surface of the output side bearing house 510.

  Next, the front-end | tip part 610 of the 1st contact part 61 by other embodiment is demonstrated using FIG. In addition, the same code | symbol is attached | subjected about the same structure as the above-mentioned embodiment, and the description is abbreviate | omitted. As shown in FIG. 9, the point of difference between the front end portion 610 and the above-described embodiment is that the burr 610 a formed on the front end portion 610 of the first contact portion 61 by pressing the conductive plate 60 is used as it is. It is made to contact | abut to the side surface of the bearing house 520 of the non-output side.

  Burr 610a formed on the fracture surface 610c side and sagging 610b formed on the shear surface 610d side are present at the corner portion of the tip portion 610 of the first contact portion 61 by pressing. A burr 610a formed on the side of the fracture surface 610c of the tip 610 is brought into contact with the side surface of the bearing house 520 on the side opposite to the output. Since this burr 610a has a sharp tip, when it is brought into contact with the side surface of the bearing house 520 on the counter-output side, it can bite into the side surface of the bearing house 520 on the counter-output side. As a result, the contact area with the side surface of the bearing house 520 on the non-output side is increased, and the first contact portion 61 of the conduction plate 60 is difficult to come off from the groove portion 80.

  Also in the present embodiment described above, the same effects as those of the above-described embodiment can be obtained. Furthermore, the burr 610a of the tip 610 bites into the side surface of the bearing house 520 on the counter-output side, so that the contact area with the side surface of the bearing house 520 on the counter-output side increases, and the first contact portion 61 of the conduction plate 60 increases. Can be made difficult to remove from the groove 80. Therefore, it is possible to further ensure stable contact between the conduction plate 60 and the bearing house 520 on the counter-output side.

DESCRIPTION OF SYMBOLS 10 Stator core 11 Teeth part 12 Insulator 13 Winding 20 Outer part 22 Groove part 27 Groove part 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 Counter output side bearing 51 Output side bracket 510 Output Side bearing house 52 Anti-output side bracket 520 Non-output side bearing house 60 Conductive plate 61 First contact portion 610 Tip portion 610a Burr 610b Sag 610c Fracture surface 610d Shear surface 62 Second contact portion 63 Conductive band 631 Folding Curved portion 632 Convex-shaped portion 70 Anti-vibration rubber 80 Groove portion 90 Holding means d Depth of groove portion t Thickness of conductive plate 60 D Diameter of bearing house 520 on the non-output side W Width of conductive plate 60 R1 First contact portion 61 radius of curvature of tip 610 R2 Curvature of the side surface of the bearing house 520 of the power side radius

Claims (3)

A stator formed with a mold resin to form a bottomed cylindrical outer shell,
A rotor arranged rotatably on the inner diameter side of the stator;
A bearing that supports the output side and the non-output side of the output rotation shaft of the rotor;
A conductive bracket is formed in which a bearing house for accommodating the bearing is formed and arranged on both the output side and the non-output side of the outer shell,
With a metal conduction plate that conducts the output side bracket and the non-output side bracket,
The conductive plate has a first abutting portion formed so as to abut on the side surface of the bearing house on the output side or the non-output side on one end side in a state of warping away from the outer shell,
A second abutting portion formed to abut on the inner side of the bracket on the output side or the counter-output side press-fitted into the outer shell on the other end side;
A conductive band connecting the first contact portion and the second contact portion;
The mold motor according to claim 1, wherein the first contact portion has a tip portion formed in an arc shape along the side surface of the bearing house.   2. The molded motor according to claim 1, wherein a radius of curvature of the tip portion is larger than a radius of curvature of the side surface of the bearing house.   2. The burr formed on the fractured surface side by press working among the corners formed at the tip of the first contact portion is brought into contact with the side surface of the bearing house. 2. Mold motor according to 2.

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