JP2012210064A - Molded motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molded motor that causes less electric corrosion in bearings and produces less noise and vibration.SOLUTION: A conductive plate 60 with elasticity allows electrical continuity between a bracket 51 on an output side and a bracket 52 on a counter-output side. The conductive plate 60 is less likely to be broken by external forces, changes less with time, and thus allows the electrical continuity between the bracket 51 on the output side and the bracket 52 on the counter-output side to be less likely to be interrupted. Accordingly, a potential difference is less likely to occur between the bracket 51 on the output side and the bracket 52 on the counter-output side, and electric corrosion is thus less likely to be caused in a bearing 41 on the output side and a bearing 42 on the counter-output side. Therefore, there is provided a molded motor 100 that produces less noise and vibration.

Description

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

  In the inner rotor type mold motor, the rotor is disposed on the inner diameter side of the stator that is molded by a mold resin and has an outer shape, and the output side and the counter-output side of the rotor output rotating shaft are supported by bearings. Rotate. The bearing is housed in a bearing house formed on brackets disposed on both the output side and the counter-output side of the outer shell of the stator.

  Here, if a potential difference is generated between the output-side bracket and the non-output-side bracket, current flows in the bearing, and if electric corrosion occurs in the bearing, vibration and noise of the motor are generated. As a measure against this electrolytic corrosion, there is known a mold motor in which a conductive tape affixed to a side surface outside the mold between the output side bracket and the non-output side bracket (for example, a patent). Reference 1).

JP 2007-20348 A (page 4, paragraph [0019], FIG. 1).

  However, since the conductive tape is affixed to the outside of the mold, the conductive tape may be peeled off or cut during assembly of the mold motor, assembly into the product, transportation, maintenance, aging, etc. Therefore, there is a risk that the conduction between the output-side bracket and the non-output-side bracket is interrupted.

  Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a molded motor that hardly causes electrolytic corrosion on a bearing and has less noise and vibration.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a stator in which an outer shape is formed by molding with a molding resin, and is rotatably disposed on the inner diameter side of the stator. And a conductive bearing that supports the output side and the non-output side of the output rotation shaft of the rotor, and a bearing house that houses the bearing is formed and arranged on both the output side and the non-output side of the outer shell. A conductive bracket and a projecting portion formed on the inner periphery, and a ring-shaped end portion that is press-fitted into the outer periphery of the bearing house on at least one of the output side and the non-output side. A molded motor comprising: a conductive plate that conducts between the bracket and a non-output-side bracket.

According to this configuration, since the conduction between the output-side bracket and the non-output-side bracket is taken by the conductive plate having elasticity, it is difficult to break against external force, the change over time is small, and the output-side bracket is less The continuity between the bracket and the bracket on the non-output side is difficult to be interrupted. Therefore, since a potential difference is unlikely to occur between the output side bracket and the non-output side bracket, it is possible to obtain a molded motor with less noise and vibration, which is less likely to cause electrolytic corrosion on the bearing.
Also, when the bearing house is press-fitted into the ring-shaped end, the convex part formed on the inner periphery of the ring-shaped end of the ring-fitted end is deformed in the press-fitting direction of the bearing house and is restored to return to the opposite direction after press-fitting The force is applied in the direction in which the side surface of the bearing house and the convex portion on the inner periphery of the ring come into contact with each other, and conduction between the bearing house and the conductive plate is reliably obtained.
Furthermore, by bending the convex portion, the stress applied to the bearing house side surface from the inner periphery of the ring can be relaxed, and deformation of the bearing house can be suppressed. Therefore, deformation of the bearing in the bearing house is also suppressed, the distance between the rolling element of the bearing and the inner ring and the outer ring is appropriately secured, and a molded motor with less noise and vibration can be obtained.

The invention according to claim 2 is the mold motor according to claim 1, wherein a groove portion in which the conductive plate is accommodated is provided on the opposite end face of the outer shell and the side surface of the outer shell. is there.

  According to this configuration, since the conductive plate is accommodated in the groove portion, the conductive plate does not rise on the outer end surface and the side surface, and there is no possibility that the conductive plate becomes an obstacle when the mold motor is handled.

  The invention according to claim 3 is the molded motor according to claim 1 or 2, wherein the convex portion is warped in a direction in which the bearing house is inserted into the ring-shaped end portion. .

  According to this structure, since the convex part formed in the ring inner periphery of the ring-shaped end part is warped in the insertion direction of the bearing house, the stress applied to the bearing house is further relaxed and the stress applied to the bearing house is further relaxed. House deformation is further suppressed. Therefore, the deformation of the bearing in the bearing house is further suppressed, the distance between the rolling element of the bearing and the inner ring and the outer ring is more appropriately secured, and a molded motor with less noise and vibration can be obtained.

  The invention according to claim 4 is the molded motor according to any one of claims 1 to 3, wherein the convex portions are formed at three or more locations.

According to this configuration, the ring-shaped end portion is press-fitted into the bearing house on the counter-output side while making contact with three or more convex portions formed on the inner periphery of the ring, so that the center between the inside of the ring and the bearing house Can be press-fitted while matching, and the contact between the inner circumference of the ring and the bearing house can be ensured. Further, a force is hardly applied to one place, the stress applied to the bearing house on the counter-output side can be evenly distributed, and the deformation of the bearing house on the counter-output side can be more reliably suppressed.

In the invention according to claim 5, the conduction plate includes a plate-like conduction band extending from a part of the ring outer periphery of the ring-shaped end, and at least one of the convex portions has the conduction band drawn out. It is arrange | positioned in the direction opposite to a direction, The mold motor as described in any one of Claims 1-4 characterized by the above-mentioned.

According to this configuration, when the ring-shaped end portion is press-fitted into the bearing house on the non-output side, the joining end portion of the conduction band comes into contact with the outer side surface, and the conduction band extends in a direction in which the bending angle θ of the bent portion increases. Deform. At this time, a restoring force is exerted on the conduction band to return to the original state, and the ring-shaped end portion is pulled in the direction in which the conduction band is pulled out by the restoring force. Thereby, stress is applied between the inner peripheral surface of the ring-shaped end portion and the side surface of the bearing house in the direction opposite to the direction in which the conduction band is drawn. Here, since at least one of the convex portions is arranged in a direction opposite to the direction in which the conduction band is drawn, the stress applied to the ring-shaped end in the direction opposite to the direction in which the conduction band is drawn, It can receive by a convex part and can suppress a deformation | transformation of the bearing house of a non-output side.

The invention according to claim 6 is characterized in that the front end surface of the convex portion is processed into a shape along the side surface of the bearing house, and the corner portion is chamfered. It is a mold motor as described in any one of these.

According to this configuration, since the tip end surface of the convex portion is processed into a shape along the side surface of the bearing house, when the ring-shaped end portion is press-fitted into the bearing house, it is difficult to damage the bearing house with a sharp edge. . Therefore, the bearing house is not easily broken due to scratches due to vibration or the like, and the positional deviation of the bearing is reduced, and a molded motor with less noise and vibration due to the deviation of the output rotation shaft can be obtained.

The invention according to claim 7 is characterized in that the dimension of the convex part is such that the length L1 of the base part of the convex part in the ring circumferential direction is longer than the length L2 of the convex part in the radial direction. It is a mold motor according to any one of claims 6 to 6.

According to this configuration, since the length L1 of the base of the convex portion in the ring circumferential direction is longer than the length L2 of the convex portion in the radial direction, the convex portion is difficult to be deformed to some extent, that is, strength is generated. Therefore, the conduction plate can be firmly connected to the bearing house on the non-output side, and conduction between the bearing house and the conduction plate can be reliably obtained. Further, it is possible to make it difficult to cause a positional shift between the center of the bearing house on the non-output side and the center of the ring-shaped end.

In the invention according to claim 8, the bearing house into which the ring-shaped end portion is press-fitted is formed in a bottomed cylindrical shape having a bottom surface and a side surface, and a shape of a corner portion connecting the bottom surface and the side surface is: The molded motor according to claim 1, wherein the molded motor has an R shape formed with a predetermined curvature.

According to this configuration, when the ring-shaped end portion is press-fitted into the bearing house, the convex portion is gradually deformed along an R-shaped corner portion having a predetermined curvature connecting the bottom surface and the side surface of the bearing house. Therefore, it is possible to press-fit without applying a large force suddenly, and the deformation of the bearing house is further suppressed. Therefore, the press-fitting can be easily performed, the deformation of the bearing in the bearing house is further suppressed, the distance between the rolling element of the bearing and the inner ring and the outer ring is more appropriately secured, and a molded motor with less noise and vibration can be obtained.

  According to the present invention, it is possible to obtain a molded motor that is less likely to cause electrolytic corrosion on the bearing and has less noise and vibration.

The schematic perspective view of the mold motor which concerns on embodiment. (A) is a schematic perspective view seen from the output side, (b) is a schematic perspective view seen from the non-output side. The schematic exploded perspective view of a mold motor. AA schematic sectional drawing in Fig.1 (a) of a mold motor. (A) is a top view of a conduction | electrical_connection board, (b) is BB sectional drawing in (a). The enlarged view of the convex part of a conduction board. The enlarged view of the convex part of the conduction | electrical_connection board in a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings. Note that the same reference numerals are given to the same elements throughout the description of the embodiment.

FIG. 1 is a schematic perspective view of a mold motor 100 according to the embodiment. (A) is the schematic perspective view seen from the output side, (b) is the schematic perspective view seen from the non-output side. 2 is a schematic exploded perspective view of the mold motor 100, and FIG. 3 is a schematic cross-sectional view of the mold motor 100 taken along line AA in FIG.
1, 2, and 3, the mold motor 100 includes a stator core 10, a mold resin 20, a rotor 30, an output-side bearing 41 and an anti-output-side bearing 42, an output-side bracket 51, and an anti-motor An output side bracket 52 and a conduction 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. The stator core 10 is pre-molded to form an insulator, and a winding 12 is wound around the tooth portion 11 via the insulator. The stator core 10 around which the winding 12 is wound is molded with the mold resin 20 except for the inner peripheral surface to form an outer shell. The outer shell has a cylindrical shape, and a metal bracket 52 is integrally embedded on the non-output side surface. The bracket 52 on the opposite output side is in a state where the bearing house 520 in which the bearing 42 is accommodated is exposed from the outer shell.

The rotor 30 includes an output rotation shaft 31 and a plurality of permanent magnets 32. The permanent magnets 32 are arranged around the output rotation shaft 31 at an equal interval and adjacent to each other so that N and S alternately have opposite magnetic poles, 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 then magnetizing it. The rotor 30 is accommodated opposite to the inner periphery of the stator core 10 with a predetermined gap (gap).
In addition, the rotor of this invention is not restricted to these, It can change suitably. For example, a rare earth magnet may be used instead of the ferrite magnet. A sintered magnet may be used instead of the bonded magnet.

  The output rotary shaft 31 is rotatably supported by being passed through an output-side bearing 41 and a counter-output-side bearing 42. For example, ball bearings can be used as the output-side bearing 41 and the non-output-side bearing 42, and in the embodiment, the ball 400, the inner ring 401, and the outer ring 402 are provided as rolling elements.

  In FIGS. 1, 2, and 3, the output-side bearing 41 is housed in an output-side bearing house 510 formed on the output-side metal bracket 51. The output side bracket 51 is fitted to the output side end face of the outer shell.

In FIG. 1, one end of a conduction plate 60 is press-fitted into the bearing house 520 on the opposite output side, and the other end is joined to the bracket 51 on the output side. The conductive plate 60 will be described in detail below.
2 and 4A are plan views of the conductive plate 60, and FIG. 4B is a cross-sectional view of the conductive plate 60 taken along the line BB in FIG. 4A. FIG. 5 shows an enlarged view of the convex portion 64 of the conductive plate 60.
4A, the conduction plate 60 is made of a metal plate having conductivity, and includes a ring-shaped end portion 61 and a plate-shaped conduction band 62 extending from a part of the ring outer periphery 610 of the ring-shaped end portion 61. I have. As shown in FIGS. 1, 3, and 4 (b), the conduction band 62 is bent halfway and has a substantially L-shaped shape in the cross-sectional view. Specifically, it is bent along the opposite end face of the outer shell and the side surface of the outer shell. A groove portion 21 in which the conduction plate 60 is accommodated is provided on the outer output side end surface of the outer shell and the side surface of the outer shell. A junction end 63 is provided at the end of the conduction band 62 opposite to the ring-shaped end 61. The thickness of the conductive plate 60 can be set to about 0.4 mm, for example. The conductive plate 60 is not limited to a metal plate, and may be a plate-like member having conductivity.

1 and 3, a ring-shaped end portion 61 is press-fitted into the bearing house 520 on the non-output side.
The bearing house 520 is formed in a bottomed cylindrical shape by a press, for example. The bearing 42 is accommodated inside the bearing house 520, and the ring-shaped end portion 61 is press-fitted outside. A corner portion 521 connecting the bottom surface and the side surface of the bearing house 520 has an R shape formed with a predetermined curvature.
On the other hand, the joining end portion 63 is sandwiched between the outer side surface and the output-side bracket 51 and joined to the output-side bracket 51.

  1, 2, 3, and 4, convex portions 64 are formed at 10 positions at equal intervals on the ring inner periphery 611 of the ring-shaped end portion 61. One of the convex portions 6401 is arranged in a direction opposite to the direction in which the conduction band 62 is drawn.

In FIG. 5, the enlarged view of the convex part 64 of the conduction | electrical_connection board 60 was shown. In the drawing, the insertion direction of the bearing house 520 on the opposite output side to the ring-shaped end portion 61 is indicated by a white arrow.
In FIG. 5, the convex portion 64 has a substantially rectangular shape and is formed to warp in the insertion direction of the bearing house 520 on the counter-output side.
A corner portion 642 is chamfered on the tip end surface 641 of the convex portion 64. Further, the front end surface 641 of the convex portion 64 is formed in an arc shape along the side surface of the bearing house 520 on the opposite output side. Moreover, the edge of the front-end | tip part of the convex part 64 may be processed into the curve shape as shown in FIG. 6 as a modification.
Furthermore, the dimension of the convex part 64 is preferably such that the circumferential length L1 of the ring-shaped end 61 of the base 640 of the convex part 64 is longer than the radial length L2.

  The mold motor 100 configured as described above causes a current to flow through the winding 12 and generate a rotating magnetic field in the stator core 10 according to the rotational position of the rotor 30 detected by a position detection sensor (not shown). 30 can be rotated together with the output rotating shaft 31.

According to the embodiment described above, the following effects can be obtained.
(1) Since the conduction between the output-side bracket 51 and the non-output-side bracket 52 is taken by the conductive plate 60 having elasticity, it is difficult to break with respect to external force, there is little change over time, and there is little change over time. The conduction between the bracket 51 and the non-output-side bracket 52 can be made difficult to be interrupted. Therefore, a potential difference can hardly be generated between the output-side bracket 51 and the non-output-side bracket 52, so that electric corrosion can be hardly generated in the output-side bearing 41 and the non-output-side bearing 42, and noise and vibration are reduced. The mold motor 100 can be obtained.
Further, when the bearing house 520 is press-fitted into the ring-shaped end portion 61, the convex portion 64 formed on the ring inner periphery 611 of the ring-shaped end portion 61 to be press-fitted is deformed in the press-fitting direction of the bearing house 520, and is opposite after the press-fitting. A force is applied in the direction in which the side surface of the bearing house 520 and the convex portion 64 of the ring inner periphery 611 come into contact with each other due to the restoring force to return to the direction, and conduction between the bearing house 520 and the conduction plate 60 can be obtained with certainty.
Further, the bending of the convex portion 64 can relieve the stress applied from the ring inner periphery 611 to the side surface of the bearing house 520, and can suppress deformation of the bearing house 520. Accordingly, the deformation of the bearing 42 in the bearing house 520 can be suppressed, the deformation of the bearing 42 in the bearing house 520 on the counter-output side can be further suppressed, and the bearing 42 on the counter-output side and the bearing 41 on the output side can be suppressed. The center can be made to coincide with the direction of the output rotation shaft 31, and the mold motor 100 with less noise and vibration can be obtained.

  (2) Since the conductive plate 60 is accommodated in the groove portion 21, the conductive plate 60 does not rise on the outer end surface and the side surface, and there is no possibility that the conductive plate 60 becomes an obstacle when handling the motor.

  (3) Since the convex portion 64 formed on the ring inner periphery 611 of the ring-shaped end portion 61 is warped in the insertion direction of the bearing house 520 on the counter-output side, it can be more easily bent during press-fitting, and the bearing on the counter-output side The stress applied to the house 520 can be further relaxed, and deformation of the bearing house 520 on the counter-output side can be further suppressed. Therefore, deformation of the bearing 42 in the bearing house 520 on the non-output side can be further suppressed, and the center of the bearing 42 on the counter-output side and the center of the output-side bearing 41 can be made coincident with each other in the direction of the output rotation shaft 31. In addition, the molded motor 100 with less vibration can be obtained.

  (4) Since the ring-shaped end portion 61 is press-fitted into the bearing house 520 on the counter-output side while being in contact with the three or more convex portions 64 formed on the inner periphery 611 of the ring, the inner ring 611 and the bearing house 520 Can be press-fitted while matching the center of the ring and the contact between the ring inner periphery 611 and the bearing house 520 can be ensured. Further, the force is hardly applied to one place, the stress applied to the bearing house 520 on the opposite output side can be evenly distributed, and the deformation of the bearing house 520 on the opposite output side can be further suppressed.

  (5) When the ring-shaped end 61 is press-fitted into the bearing house 520 on the non-output side, the joining end 63 of the conduction band 62 comes into contact with the outer side surface, and the bending angle θ of the bent part 621 is the bending angle θ of the conduction band 62. Deforms in the spreading direction. At this time, a restoring force is exerted on the conduction band 62 to return to the original state, and the ring-shaped end portion 61 is pulled in the direction in which the conduction band 62 is pulled out by this restoring force. Thereby, stress is applied between the inner peripheral surface of the ring-shaped end portion 61 and the side surface of the bearing house in the direction opposite to the direction in which the conduction band 62 is drawn. Here, since at least one convex portion 6401 of the convex portion 64 is arranged in the direction opposite to the direction in which the conduction band 62 is drawn out, the ring-shaped end in the direction opposite to the direction in which the conduction band 62 is drawn out. The stress applied to the portion 61 can be received by the convex portion 64, and the deformation of the bearing house 520 on the counter-output side can be further suppressed. At this time, it is more preferable that the tip end surface of the convex portion 64 is formed in an arc shape along the shape of the side surface of the bearing house because stress can be dispersed. Therefore, deformation of the bearing 42 in the bearing house 520 on the counter-output side can be further suppressed.

  (6) Since the front end surface 641 of the convex portion 64 is formed in an arc shape along the side surface of the bearing house, and the corner portion 642 is chamfered, the ring-shaped end portion 61 is changed to the bearing house 520 on the non-output side. When press-fitting, the bearing house 520 on the non-output side can be hardly damaged by a sharp edge. Therefore, the bearing house 520 on the non-output side can be made difficult to break due to scratches caused by vibrations, the positional deviation of the bearing 42 can be reduced, and the molded motor 100 with less noise and vibration due to the deviation of the output rotating shaft 31 can be obtained. it can.

  (7) Since the ring circumferential length L1 of the base portion 640 of the convex portion 64 is longer than the radial length L2 of the convex portion 64, the convex portion 64 is difficult to be deformed to some extent, that is, strength is generated. . Therefore, the conduction plate 60 can be firmly connected to the bearing house 520 on the opposite output side, and conduction between the bearing house and the conduction plate can be reliably obtained. Further, it is possible to make it difficult for the position difference between the center of the bearing house 520 on the non-output side and the center of the ring-shaped end portion 61 to occur.

  (8) When the ring-shaped end portion 61 is press-fitted into the bearing house 520 on the non-output side, the convex portion 64 is formed with a predetermined curvature that connects the bottom surface and the side surface of the bearing house 520 on the non-output side. Therefore, it is possible to perform press-fitting without applying a large force suddenly, and it is possible to further suppress the deformation of the bearing house 520 on the counter-output side. Therefore, press-fitting can be easily performed, and deformation of the bearing 42 in the bearing house 520 on the counter-output side can be further suppressed.

  In addition, the mold motor 100 in embodiment can be used as a motor which drives a ventilation fan with a household room air conditioner, for example. A cross flow fan is attached to the output rotating shaft 31 when used in an indoor unit, and a propeller fan is attached to the output rotating shaft 31 when used in an outdoor unit.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the gist of the present invention described in the claims. It can be changed.

  For example, the ring-shaped end portion 61 may be press-fitted in the output-side bearing house 510, or the output-side bearing house 510 and the output-side bearing house 510 and You may press-fit into both the bearing houses 520 of the non-output side, and you may conduct | electrically_connect.

  Further, the output-side bearing 41 and the non-output-side bearing 42 can achieve the above-described effects as long as they have conductivity even if they have different sizes and shapes.

  DESCRIPTION OF SYMBOLS 10 ... Stator core, 11 ... Teeth, 12 ... Winding, 20 ... Mold, 21 ... Groove, 30 ... Rotor, 31 ... Output rotating shaft, 32 ... Permanent magnet, 41 ... Output side bearing, 42 ... Non-output side Bearing: 51 ... Output side bracket, 52 ... Non-output side bracket, 60 ... Conducting plate, 61 ... Ring end, 62 ... Conducting band, 63 ... Junction end, 64 ... Convex part, 100 ... Mold motor, 401: inner ring, 402: outer ring, 510: bearing house on the output side, 520 ... bearing house on the non-output side, 521 ... outer periphery on the press-fitting side, 610 ... outer periphery of the ring, 611 ... inner periphery of the ring, 640 ... base, 641 ... tip Surface, 642 ... corner.

Claims (8)

A stator molded with a mold resin and formed with an outer shell;
A rotor rotatably disposed on the inner diameter side of the stator;
A conductive bearing that supports the output side and the non-output side of the output rotation shaft of the rotor;
A conductive bracket formed with a bearing house for housing the bearing and disposed on both the output side and the non-output side of the outer shell;
An output-side bracket and a counter-output-side bracket having a ring-shaped end portion press-fitted into the outer periphery of the bearing house on at least one of the output side and the counter-output side with a convex portion formed on the inner periphery A molded motor characterized by comprising a conductive plate that conducts through. In the molded motor according to claim 1,
A molded motor, wherein a groove portion for accommodating the conductive plate is provided on an end face on the side opposite to the output side of the outer shell and a side surface of the outer shell. In the molded motor according to claim 1 or 2,
The mold motor, wherein the convex portion is warped in a direction in which the bearing house is inserted into the ring-shaped end portion. In the molded motor according to any one of claims 1 to 3,
The mold motor is characterized in that the convex portions are formed at three or more locations. In the molded motor according to any one of claims 1 to 4,
The conduction plate includes a plate-like conduction band extending from a part of the ring outer periphery of the ring-shaped end,
At least one of the convex portions is arranged in a direction opposite to the direction in which the conduction band is drawn out. In the molded motor according to any one of claims 1 to 5,
A mold motor, wherein a tip end surface of the convex portion is processed into a shape along a side surface of the bearing house, and a corner portion is chamfered. In the molded motor according to any one of claims 1 to 6,
The mold motor is characterized in that a dimension of the convex portion is such that a length L1 of the base portion of the convex portion in the ring circumferential direction is longer than a length L2 of the convex portion in the radial direction. In the molded motor according to any one of claims 1 to 7,
The bearing house into which the ring-shaped end is press-fitted is formed in a bottomed cylindrical shape having a bottom surface and a side surface, and the shape of a corner portion connecting the bottom surface and the side surface is formed with a predetermined curvature. Mold motor characterized by its shape.

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