JP2014195336A - Mold motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly hold a conduction member in a bearing house without graving the outline of a stator in the case where the conduction member is press-fitted into the outline of the stator, while improving material yield of the conduction member by preventing the conduction member from being cut or exfoliated when conducting an output-side bracket and an anti-output-side bracket.SOLUTION: A metallic conduction plate 60 comprises a first abutment part 61 which is abutted to an outer side surface 5201 of an anti-output-side bearing house 520, and a folded part 631 which is formed continuously to the first abutment part 61. Between an outline 20 and the anti-output-side bearing house 520, a first groove part 80 is provided in which the first abutment part 61 and the folded part 631 are press-fitted. In a flange part 521 extending from a lower end of the outer side surface 5201 of the anti-output-side bearing house 520 towards the outline 20, a cut-and-raised piece 5211 is included by cutting and raising a portion so as to be abutted to the outline 20. When the first abutment part 61 and the folded part 631 are press-fitted into the first groove part 80, the folded part 631 is abutted to the cut-and-raised piece 5211.

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. An object of the present invention is to provide a molded motor capable of firmly holding a conducting member in a bearing house when the conducting member is press-fitted into the outer shell of the stator while 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 each of the output side and the non-output side of the outer shell, and a bracket on the output side; A conductive plate made of metal that conducts the non-output-side bracket, and the conductive plate is formed on one end side so as to make contact with the outer side surface of the output-side or non-output-side bearing house. And a second abutting portion formed so as to abut on the inner side of the output-side or counter-output-side bracket that is press-fitted into the outer wall on the other end side, and the first abutting portion and the second abutting portion are connected to each other Guidance The conduction band includes a bent portion formed continuously with the first contact portion, and the first contact portion is provided between the outer shell and the bearing house that contacts the first contact portion. A bearing house that includes a first groove portion that press-fits the bent portion and that contacts the first contact portion is formed with a flange portion that extends from the lower end of the outer side surface toward the outer contour, and the flange portion contacts the outer contour. When the first contact part and the bent part are press-fitted into the first groove part, the bent part is cut and raised and comes into contact with the piece.

  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. The conduction band includes a bent portion formed continuously with the first abutting portion, and the first abutting portion and the bent portion are provided between the outer shell and the bearing house that abuts on the first abutting portion. The bearing house that includes the first groove portion that press-fits the first contact portion is formed with a flange portion that extends from the lower end of the outer side surface toward the outer contour, and the flange portion is configured to contact the outer contour. When the first contact part and the bent part are press-fitted into the first groove part, the bent part is cut and raised and comes into contact with the piece. Can be held in. Furthermore, when the first abutting portion and the bent portion are press-fitted into the first groove portion, the bent portion is cut and raised and comes into contact with the piece, so that the press-fitted portion of the conductive plate does not directly touch the outer shell of the stator. There is no risk of scraping the outer shell of the stator formed of resin with the conductive plate, and the conductive plate can be firmly held in the bearing house.

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. FIG. 6 is an enlarged plan view showing a state before the conductive plate of FIG. 5 is press-fitted into the outer shell of the stator. FIG. 6 is an enlarged perspective view showing a state before the conductive plate of FIG. 5 is press-fitted into the outer shell of the stator.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 7 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 second groove portion 22 in which the conductive plate 60 is accommodated is provided on the end face on the opposite side of the outer shell 20 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 5201 of the bearing house 520 on the counter-output side, and the conductive band 63 is accommodated in the second groove portion 22. Since the conductive plate 60 is accommodated in the second 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 100 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 for holding the first contact portion 61 in contact with the outer side surface 5201 of the bearing house 520 on the opposite 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 conductive plate 60 has a first abutment portion 61 as a first holding portion, and an L-shape continuously formed on the conduction band 63 on the outer diameter side of the first abutment portion 61. And a convex portion 632 formed of a bent portion 631. Further, by combining the bearing house 520 on the non-output side and the outer shell 20, the outer side surface 5201 of the bearing house 520 on the counter-output side and the inner diameter side surface 21 on the end surface on the counter-output side of the outer shell 20 are used as the second holding portion. Between, the 1st groove part 80 which press-fits the convex-shaped part 632 is provided.

  6 and 7, the first groove portion 80 is formed in an annular shape on the outer diameter side of the bearing house 520 on the counter-output side, and the second groove portion is formed on the inner diameter side surface 21 on the end surface on the counter-output side of the outer shell 20. A stepped portion 27 that is recessed by one step is formed at a location continuous to 22. Further, in the bearing house 520 on the non-output side, a flange 521 extending from the lower end of the outer side surface 5201 toward the outer diameter side (toward the outer shell 20) is formed in FIGS. Yes. The flange portion 521 of the bearing house 520 on the counter-output side has a cut-and-raised piece 5211 that is cut and raised with the outer diameter side directed toward the inner diameter side. 21 and the second groove 22 are in contact with the outer shell 20. On the other hand, the convex portion 632 of the conductive plate 60 is bent so that the bent portion 631 is along the cut-and-raised piece 5211 accommodated in the stepped portion 27, and the first contact portion 61 is formed on the inner diameter side of the bent portion 631. The first contact part 61 is connected and is bent in a direction opposite to the bending direction of the bent part 631, thereby forming a substantially convex cross section. Thereby, when the convex-shaped part 632 is press-fitted into the first groove part 80, the outer side surface 631 a of the bent part 631 comes into contact with the cut and raised piece 5211 included in the flange part 521.

  In FIG. 4, the dimension of the thickness t of the conductive plate 60 is about 0.4 mm, for example, and the dimension of the depth d of the second groove 22 is greater than the dimension of the thickness t of the conductive plate 60. Is also getting bigger. 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 or the like approaches the second groove portion 22, the finger is not caught on the conduction plate 60, It is possible to prevent the conductive plate 60 from coming off from the second groove portion 22. The length L1 from the outer side surface 631a of the bent portion 631 to the distal end portion 610 of the first abutting portion 61 in the conductive plate 60 before being press-fitted into the first groove portion 80 is the non-output side of the outer shell 20 The width dimension L2 from the inner diameter side surface 5211a of the cut-and-raised piece 5211, which is accommodated in the stepped portion 27 formed on the inner diameter side surface 21 of the end face, to the outer side surface 5201 of the bearing house 520 on the opposite output side is larger. 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 5201 of the bearing house 520 on the non-output side.

  Next, with reference to FIGS. 4, 6, and 7, the first contact portion 61 and the bent portion 631 of the conductive plate 60, that is, the state in which the convex portion 632 is press-fitted into the first groove portion 80 will be described in detail. explain. Since the convex portion 632 and the first groove portion 80 have a dimensional relationship of L1> L2, when the convex portion 632 is press-fitted into the first groove portion 80, the outer side surface 631a of the bent portion 631 is cut and raised. It comes into contact with the inner diameter side surface 5211a of 5211 so as to be pressed. Further, the front end portion 610 of the first contact portion 61 comes into contact with the outer side surface 5201 of the bearing house 520 on the non-output side. As a result, the convex portion 632 is unlikely to come out of the first groove portion 80 due to surface contact between the outer side surface 631a of the bent portion 631 and the inner diameter side surface 5211a of the cut and raised piece 5211. Therefore, the state in which the conductive plate 60 is press-fitted into the outer shell 20 of the stator is maintained, and stable contact between the conductive plate 60 and the outer side surface 5201 of the bearing house 520 on the non-output side is ensured.

  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 5201 of the bearing house 520 on the opposite output side, it can be prevented from being cut or peeled off like a conductive tape. it can. 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.

  Further, according to the molded motor 100 according to the embodiment described above, when the first contact portion 61 and the bent portion 631 are press-fitted into the first groove portion 80, the bent portion 631 is cut and raised to contact the piece 5211. Therefore, the conduction plate 60 can be firmly held in the bearing house 520 on the non-output side. Further, when the first contact portion 61 and the bent portion 631 are press-fitted into the first groove portion 80, the bent portion 631 is cut and raised and comes into contact with the piece 5211, so that the press-fitted location of the conduction plate 60 is in the outer shell 20 of the stator. Since there is no direct contact, there is no possibility of scraping the outer shell 20 of the stator formed of the mold resin with the conductive plate 60, and the conductive plate 60 can be firmly held in the bearing house 520 on the non-output side. Further, as shown in FIG. 4, the cut and raised pieces 5211 are formed by cutting and raising the outer diameter side of the flange portion 521 of the bearing house 520 on the opposite output side toward the inner diameter side. When the outer shell 20 is formed by molding, the cut-and-raised mark (notch) 5212 formed on the outer diameter side of the cut-and-raised piece 5211 can be filled with mold resin, so that dust from the outside is cut and cut (cut). It is possible to prevent intrusion from 5212 to the inside of the molded motor 100 (inner peripheral side of the outer shell 20 of the stator). Further, as the outer shell 20 for forming the first groove portion 80, when the bent portion 631 of the conductive plate 60 is formed by molding resin at the portion where the bent portion 631 is press-fitted, the outer portion 20 is formed by the bent portion 631 when the bent portion 631 is press-fitted. In order to avoid cutting, it is necessary to strictly manage the dimension L1 of the convex part 632 and the dimension L2 of the first groove part 80 shown in FIG. 4, which increases the manufacturing cost. However, as shown in FIG. By forming the bent part 631 with the cut-and-raised piece 5211 in the flange part 521 of the metal non-output-side bearing house 520 at the place where the bent part 631 is press-fitted, the bent part 631 is pressed by the bent part 631. Since the outer shell 20 is not scraped, the dimension management of the dimension L1 of the convex part 632 and the dimension L2 of the first groove part 80 becomes easy, and the manufacturing cost can be suppressed.

  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 5201 of the bearing house 520 on the counter-output side, but the present invention is not limited to this. Instead, the first contact portion 61 may be in contact with the outer side surface of the output-side bearing house 510. Moreover, although the front-end | tip part 610 of the 1st contact part 61 is formed in circular arc shape, this invention is not limited to this, The front-end | tip part 610 of 1st contact part 61 may be formed in linear form. Further, the cut and raised piece 5211 is formed by raising the outer diameter side of the flange portion 521 toward the inner diameter side. However, the present invention is not limited to this, and the cut and raised piece 5211 extends the inner diameter side of the flange portion 521. It may be formed by cutting up toward the outer diameter side. Further, the cut and raised piece 5211 is formed by cutting and raising a part of the flange portion 521. However, the present invention is not limited to this, and can be appropriately changed. For example, the flange portion 521 is replaced with the cut and raised piece 5211. Alternatively, the entire outer peripheral edge may be bent in the direction of the rotation axis to form an annular shape.

DESCRIPTION OF SYMBOLS 10 Stator core 11 Teeth part 12 Insulator 13 Winding 20 Outer side 21 Inner diameter side surface 22 2nd 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 Opposite output side bearing 51 Output Side bracket 510 Output side bearing house 52 Anti-output side bracket 520 Anti-output side bearing house 5201 Outer side surface 521 Hook 5211 Cut and raised piece 5211a Inner diameter side surface 5212 Cut and raised trace (notch)
60 conductive plate 61 first contact portion 610 tip end portion 62 second contact portion 63 conduction band 631 bent portion 631a outer side surface 632 convex shape portion 70 vibration isolating rubber 80 first groove portion 90 holding means d depth of groove portion 22 t Thickness of the conductive plate 60 D Diameter of the bearing house 520 on the non-output side W Width of the conductive plate 60 L1 Length dimension from the outer side surface 631a of the bent portion 631 to the distal end portion 610 of the first contact portion 61 L2 Width dimension from inner diameter side surface 5211a of cut-and-raised piece 5211 to side surface of bearing house 520 on the non-output side

Claims (2)

A stator formed with a mold resin to form a bottomed cylindrical outer shell,
A rotor rotatably arranged 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 the output side and the opposite output side of the outer shell,
A metal conduction plate for conducting the output side bracket and the non-output side bracket;
The conductive plate has a first abutting portion formed on one end side so as to abut on the outer side surface of the bearing house on the output side or the non-output side,
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 conduction band includes a bent portion formed continuously with the first contact portion,
Between the outer shell and the bearing house in contact with the first contact portion, a first groove portion for press-fitting the first contact portion and the bent portion is provided,
A flange extending from the lower end of the outer side surface toward the outer shell is formed in the bearing house that contacts the first contact portion, and a portion of the flange is cut up so as to contact the outer shell. A mold motor comprising a cut and raised piece, wherein the bent portion comes into contact with the cut and raised piece when the first contact portion and the bent portion are press-fitted into the first groove portion.   The molded motor according to claim 1, wherein the cut and raised piece is cut and raised with the outer diameter side of the flange portion directed toward the inner diameter side.

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