JP2012257350A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor in which the air in the motor can be discharged efficiently to the outside, and the cooling performance can be improved.SOLUTION: The motor includes a case 2, a rotor housed in the case 2, and a fin housed in the case 2 to rotate integrally with the rotor. In the inner surface at the axial end of the case 2, an inclined plane 21 inclining to become deeper gradually in the axial direction along the circumferential direction, and a level difference surface 22 extending substantially along the axial direction within a range from the radial inside of the inclined plane 21 at the deepest part thereof to the radial outside of the inclined plane 21 are formed. Furthermore, a ventilation hole 23 communicating between the inside and outside is formed at a position corresponding to the deepest part of the inclined plane 21 and the level difference surface 22 on the side surface of the case 2 in the direction orthogonal to the axis.

Description

  The present invention relates to a motor having a cooling function.

  2. Description of the Related Art Conventionally, some motors include fins that rotate integrally with a rotor in a case (perform a blowing operation with rotation) (see, for example, Patent Document 1). In such a motor, when the rotor is driven to rotate, a blowing operation is performed by the fins accordingly, and the motor (brush or winding) can be cooled.

JP 2006-333639 A

  By the way, since the cooling performance is low even if air is circulated only in the motor, there is a case in which a ventilation hole is formed in the case so that the air can be circulated inside and outside the case. However, simply forming ventilation holes in the case is insufficient in cooling performance, and further improvement in cooling performance is desired.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor capable of efficiently discharging the air in the motor to the outside and improving the cooling performance. There is to do.

  The invention according to claim 1 is a motor comprising a case, a rotor housed in the case, and a fin housed in the case and rotating integrally with the rotor, the axial direction of the case On the inner surface of the end portion, an inclined surface inclined so as to gradually deepen in the axial direction along the circumferential direction, and from the radially inner side of the inclined surface to the radially outer side of the inclined surface at the deepest portion of the inclined surface A step surface extending substantially along the axial direction is formed in the range, and a vent hole communicating with the inside and outside is formed at a position corresponding to the deepest portion of the inclined surface and the step surface on the side surface in the direction orthogonal to the axis of the case. It is a summary.

  According to this configuration, on the inner surface of the axial end portion of the case, an inclined surface that is inclined so as to gradually deepen in the axial direction along the circumferential direction, and the radial direction of the inclined surface at the deepest portion of the inclined surface A step surface extending substantially along the axial direction in the range from the inner side to the outer side in the radial direction of the inclined surface, so that the wind accompanying the rotation of the fin flows along the inclined surface and hits the step surface of the deepest part Become. And since the vent hole communicating with the inside and outside is formed at the position corresponding to the deepest part of the inclined surface and the step surface on the side surface in the direction perpendicular to the axis of the case, the wind hitting the step surface is mainly from the vent hole to the outside Will be discharged. As described above, since the air in the case can be efficiently discharged to the outside as compared with the case where the ventilation holes are simply formed somewhere, the cooling performance can be improved.

  According to a second aspect of the present invention, in the motor according to the first aspect, the step surface is inclined with respect to the radial direction when viewed from the axial direction so as to reflect the air flowing along the inclined surface outward in the radial direction. The gist is that it was formed.

  According to this configuration, the step surface is formed so as to be inclined with respect to the radial direction when viewed from the axial direction so as to reflect the air flowing along the inclined surface to the radially outer side (ventilation hole side). The wind that hits the air can be discharged from the ventilation hole smoothly and efficiently to the outside.

The invention according to claim 3 is summarized in that in the motor according to claim 1 or 2, a plurality of sets of the inclined surface, the step surface, and the ventilation hole are formed in the circumferential direction.
According to this configuration, a plurality of sets of the inclined surface, the stepped surface, and the ventilation hole are formed in the circumferential direction, so that air is discharged from the plurality of locations in the circumferential direction to the outside, and the cooling performance is good. It can be.

  According to a fourth aspect of the present invention, in the motor according to the third aspect, the wall constituting the deepest portion of the inclined surface, the wall constituting the stepped surface, and the wall constituting the shallowest portion of the inclined surface. And are continuously formed with a substantially constant thickness in this order.

  According to this configuration, the wall that forms the deepest part of the inclined surface, the wall that forms the stepped surface, and the wall that forms the shallowest part of the inclined surface are continuously formed in this order with a substantially constant plate thickness. Therefore, an increase in material cost can be suppressed. That is, if the outer surface of the end portion in the axial direction of the case is a flat surface and the shallowest portion of the stepped surface or inclined surface is formed while the plate thickness of the end portion in the axial direction of the case is increased, the material cost increases accordingly. However, this can be avoided and an increase in material cost can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the motor in which the air in a motor can be efficiently discharged | emitted outside and cooling performance can be made favorable can be provided.

The perspective view of the motor in this Embodiment. The top view of the motor in this Embodiment. The side view of the motor in this Embodiment. The schematic diagram of the rotor and level | step difference surface in this Embodiment. (A) (b) The top view of the core sheet in this Embodiment. The perspective view of the insulator in this Embodiment.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the case 2 of the motor 1 includes a cylindrical housing 3 formed in a cylindrical shape, and an opening (on the upper side in FIGS. 1 and 3) of the cylindrical housing 3. The upper cover 4 that is substantially closed and the lower cover 5 that substantially closes the other opening (lower side in FIGS. 1 and 3) of the cylindrical housing 3 are provided.

  A plurality of stator magnets (not shown) are fixed on the inner peripheral surface of the cylindrical housing 3 in the circumferential direction. A rotating shaft 7 of the rotor 6 (see FIG. 4) is rotatably supported at the shaft centers of the upper cover 4 and the lower cover 5 via a bearing (not shown). The rotor 6 is accommodated in the case 2 (inside the stator magnet) so that only the upper end of the rotating shaft 7 protrudes from the case 2 to the outside. The motor 1 of the present embodiment is a fan motor for cooling the radiator, and a cooling fan (not shown) is fixed to the upper end of the rotating shaft 7.

  As shown in FIG. 4, the rotor 6 includes a rotating shaft 7, a core 9 fixed to the rotating shaft 7 and wound with a winding 8, and a rectifier fixed to the rotating shaft 7 and connected to the winding end of the winding 8. It has a child 10. A brush (not shown) held on the lower cover 5 is brought into contact (sliding contact) with the commutator 10, and the commutator 10 receives a drive current supplied from the outside via the brush 8. To supply.

  The core 9 is composed of a laminated core formed by laminating a plurality of core sheets 11 and 12. Two insulators 13 as insulating members for insulation from the winding 8 are mounted on the core 9 from both axial directions, and the winding 8 is wound from above the insulator 13.

  The core 9 is formed by laminating two types of plate-like core sheets 11 and 12 as shown in FIGS. The core sheet 11 shown in FIG. 5A includes 16 teeth portions 11 a for winding the winding 8. The 16 teeth portions 11a are arranged at equiangular intervals in the circumferential direction, and are provided with convex portions 11b projecting on both sides in the circumferential direction at the radially outer end portions of the teeth portions 11a. At the radially inner end, adjacent tooth portions 11a are connected in the circumferential direction by a connecting portion 11c having an annular shape. From the inside of the connecting portion 11c, three stay portions 11d are extended radially inward at equal angular intervals in the circumferential direction, and the radially inner end portion of the stay portion 11d is the rotating shaft. 7 is inserted in the circumferential direction by an annular insertion portion 11f that forms an insertion hole 11e for fixing the core 9 to the rotary shaft 7. The stay part 11 d and the insertion part 11 f constitute a fixing part for fixing the core 9 to the rotating shaft 7. A hole 11g is formed in a portion surrounded by the connecting portion 11c, the three stay portions 11d, and the insertion portion 11f.

  The core sheet 12 shown in FIG. 5B is provided with 16 tooth portions 12 a for winding the winding 8, similarly to the core sheet 11. The 16 teeth portions 12a are arranged at equal angular intervals in the circumferential direction, and are provided with convex portions 12b projecting on both sides in the circumferential direction at the radially outer end portion of the teeth portion 12a. Adjacent tooth portions 12a are connected in the circumferential direction by a connecting portion 12c having an annular shape at the radially inner end portion. And the inside of the connection part 12c becomes the insertion hole 12d by which the insulator 13 is engage | inserted. The insertion hole 12d and the hole 11g constitute a core through hole that penetrates the core 9 in the axial direction.

  In the core sheets 11 and 12 as described above, first, a plurality of core sheets 11 are laminated in the axial direction. At this time, the core sheet 11 is laminated so that the stay portion 11d overlaps in the axial direction. Next, a plurality of core sheets 12 are laminated on both ends of the laminated core sheet 11. The core sheet 12 is laminated on both ends of the laminated core sheet 11 by the number of sheets that is about half the axial length of the laminated core sheet 11. And the core 9 is integrally comprised by crimping the laminated | stacked core sheets 11 and 12 to an axial direction, or fixing by welding. The teeth portions 11a and 12a of the core sheets 11 and 12 constitute the teeth 14 shown in FIG. 1 when the core 9 is formed.

  As shown in FIG. 6, the insulator 13 is made of an insulating synthetic resin. The insulator 13 includes 16 U-shaped teeth cover portions 13 a that cover one end portion in the axial direction of the tooth 14 and both side surfaces along the axial direction to the intermediate portion in the axial direction of the core 9. A connecting wall 13b that connects the opposing side walls of the adjacent teeth cover portion 13a to the radially inner end of the teeth cover portion 13a and covers the outer peripheral surface of the connecting portions 11c and 12c between the teeth portions 11a and 12a. Is formed. An annular connecting cover portion 13c that covers one end surface in the axial direction of the connecting portion 12c is formed at the radially inner end portion of the teeth cover portion 13a. A cylindrical insertion wall 13d extending in the axial direction is formed at the radially inner end of the connecting cover portion 13c so as to be fitted into the insertion hole 12d of the core sheet 12. The axial length of the insertion wall 13 d is formed in the core 9 to be equal to the axial length of the core sheet 12 laminated on one end of the core 9. In addition, a cylindrical fixed tube portion 13 e for fixing the insulator 13 to the rotating shaft 7 by fitting the rotating shaft 7 is formed at the center of the insulator 13.

  Between the outer peripheral surface of the fixed cylinder part 13e and the inner peripheral surface of the insertion wall 13d, six fins 13f are integrally formed with the insulator 13 at equal angular intervals in the circumferential direction. Each fin 13f is inclined in one direction with respect to the axial direction of the insulator 13 (rotating shaft 7). Further, as shown in FIG. 6, the fin 13f of the present embodiment is formed so as to protrude in the axial direction from the fixed cylinder portion 13e and the insertion wall 13d. When the insertion wall 13d is inserted into the insertion hole 12d provided in both the axial directions of the core 9 and attached to the core 9 from both the axial directions, the insulator 13 is inserted into the fin 13f along with the rotation of the rotor 6. As a result, an air flow (wind) along one axial direction (upward in FIGS. 1 and 4) is generated.

  As shown in FIGS. 1 and 2, the upper cover 4 includes a flange-like portion 4a fitted into one opening (upper in FIG. 1) of the cylindrical housing 3, and the flange-like portion 4a. And an upper wall 4c that substantially closes one axial side (the upper side in FIG. 1) of the cylindrical portion 4b. . The upper cover 4 of the present embodiment is made of synthetic resin.

  The inner surface of the upper wall 4c, which is the axial end of the case 2, gradually deepens in the axial direction (as viewed from the inside) along the circumferential direction (counterclockwise direction in FIG. 2) ( An inclined surface 21 that is inclined (in the direction of expanding the internal space) is formed. Further, on the inner surface of the upper wall 4c, which is the axial end of the case 2, the diameter of the inclined surface 21 from the radially inner side of the inclined surface 21 at the deepest portion (the deepest portion when viewed from the inside) of the inclined surface 21. A step surface 22 extending substantially along the axial direction is formed in a range up to the outer side in the direction.

  In the present embodiment, three sets of the inclined surface 21 and the step surface 22 are formed in the circumferential direction. Moreover, in this Embodiment, the wall which comprises the wall which comprises the deepest part of the inclined surface 21, the wall which comprises the level | step difference surface 22, and the shallowest part (part which becomes the shallowest seeing from the inside) of the inclined surface 21 Are continuously formed with a substantially constant thickness in this order, and the thickness of the upper wall 4c is substantially constant. That is, the outer surface of the upper wall 4c is formed substantially parallel to the inclined surface 21 and the step surface 22, and as shown in FIG. 1, is a surface that repeats the inclination and the step in the circumferential direction. Further, the step surface 22 of the present embodiment is formed so as to be inclined with respect to the radial direction when viewed from the axial direction so as to reflect the wind flowing along the inclined surface 21 (the deepest part side) radially outward. ing. Further, as schematically shown in FIG. 4, the step surface 22 is formed so as to have a slight gap in the axial direction while facing the fin 13f in the axial direction.

  A discharge vent hole 23 communicating with the inside and the outside is formed at a position corresponding to the deepest portion of the inclined surface 21 and the step surface 22 in the cylindrical portion 4b which is the side surface in the direction perpendicular to the axis of the case 2. The vent hole 23 of the present embodiment is a position corresponding to a side where the deepest portion of the inclined surface 21 extends radially outward and a side where the stepped surface 22 extends radially outward, and is viewed from the radially outer side. It is formed in a substantially rectangular shape including those sides.

  Further, as shown in FIGS. 1 and 2, the lower cover 5 bulges so as not to block a part in the circumferential direction at the other opening (downward in FIG. 1) of the cylindrical housing 3. A bulging portion 5a is formed which constitutes a suction vent hole 31 communicating with the inside and outside of the case 2.

Next, the operation of the motor 1 configured as described above will be described.
When a driving current is supplied to the winding 8 from the power supply device (not shown) via the brush and the commutator 10, the fins 13 f are rotationally driven (integrated rotation) together with the rotor 6. Then, an air flow (wind) along one axial direction (upward in FIGS. 1 and 4) is generated as indicated by a thick arrow in FIG. Then, the wind hits the inclined surface 21 and flows along the inclined surface 21 (the deepest portion side), hits the step surface 22 at the deepest portion, and the wind hitting the step surface 22 mainly from the ventilation hole 23 to the outside of the case 2. (See the broken line arrows in FIGS. 2 and 4). At the same time, air is sucked into the case 2 from the suction vent 31. As a result, the motor 1 (brush and winding 8) is cooled while air is circulated inside and outside the case 2.

Next, the characteristic effects of the above embodiment will be described below.
(1) The inner surface of the upper wall 4c, which is the axial end of the case 2, has an inclined surface 21 inclined so as to gradually deepen in the axial direction along the circumferential direction, and the deepest portion of the inclined surface 21 A step surface 22 extending substantially along the axial direction is formed in a range from the radially inner side of the inclined surface 21 to the radially outer side of the inclined surface 21. Therefore, the wind accompanying the rotation of the fins 13f flows along the inclined surface 21 and hits the step surface 22 at the deepest part. Further, a vent hole 23 communicating with the inside and the outside is formed at a position corresponding to the deepest portion of the inclined surface 21 and the step surface 22 in the cylindrical portion 4b which is the side surface in the direction orthogonal to the axis of the case 2. The struck wind is mainly discharged to the outside from the ventilation hole 23. As described above, since the air in the case 2 can be efficiently discharged to the outside as compared with a case where a ventilation hole is simply formed somewhere, the cooling performance can be improved.

  (2) Since the step surface 22 is formed so as to be inclined with respect to the radial direction when viewed from the axial direction so as to reflect the wind flowing along the inclined surface 21 to the radially outer side (the ventilation hole 23 side), the step surface The wind which hits 22 can be discharged | emitted from the ventilation hole 23 to the exterior smoothly and efficiently. Specifically, if the stepped surface 22 is not inclined with respect to the radial direction when viewed from the axial direction, the action of reflecting the wind radially outward (on the ventilation hole 23 side) is reduced, but this action is increased. The wind can be discharged from the ventilation hole 23 to the outside smoothly and efficiently.

  (3) Since a plurality of sets (three sets in the present embodiment) of the inclined surface 21, the stepped surface 22, and the vent holes 23 are formed in the circumferential direction (three in the present embodiment) ) Is discharged to the outside of the case 2 to improve the cooling performance.

  (4) The wall constituting the deepest portion of the inclined surface 21, the wall constituting the stepped surface 22, and the wall constituting the shallowest portion of the inclined surface 21 are successively formed in this order with a substantially constant plate thickness. In addition, since the plate thickness of the upper wall 4c is substantially constant, an increase in material cost can be suppressed. That is, when the outer surface of the end portion in the axial direction of the case 2 (the outer surface of the upper wall 4c) is a flat surface, the stepped surface 22 and the shallowest portion of the inclined surface are formed while increasing the thickness of the end portion in the axial direction of the case 2. The material cost increases accordingly, but this can be avoided and the increase in material cost can be suppressed.

(5) Since the upper cover 4 on which the inclined surface 21, the step surface 22 and the ventilation hole 23 are formed is made of synthetic resin, the inclined surface 21, the step surface 22 and the ventilation hole 23 can be easily formed.
(6) Since the fin 13f is integrally formed with the insulator 13 attached to the core 9 of the rotor 6, it can be avoided that the fin 13f increases the number of parts and the number of assembling steps.

The above embodiment may be modified as follows.
In the above embodiment, the stepped surface 22 is formed so as to be inclined with respect to the radial direction when viewed from the axial direction so as to reflect the wind flowing along the inclined surface 21 to the radially outer side (the vent hole 23 side). However, the present invention is not limited to this, and may be changed to a stepped surface that is not inclined with respect to the radial direction when viewed from the axial direction.

  In the above embodiment, the three sets of the inclined surface 21, the stepped surface 22 and the ventilation hole 23 are formed in the circumferential direction, but the present invention is not limited to this. For example, only one set may be used. You may change into multiple sets (2 sets, 4 sets, etc.) other than 3 sets.

  In the above embodiment, the wall that forms the deepest part of the inclined surface 21, the wall that forms the stepped surface 22, and the wall that forms the shallowest part of the inclined surface 21 have a substantially constant thickness in this order. Although formed continuously, it is not limited to this, for example, the step surface 22 and the shallowest portion of the inclined surface with the outer surface of the axial end of the case 2 (the outer surface of the upper wall 4c) as a flat surface, You may shape | mold by making plate | board thickness thick.

  In the above embodiment, the upper cover 4 on which the inclined surface 21, the step surface 22, and the ventilation hole 23 are formed is made of synthetic resin, but is not limited to this, and the upper cover (the axial end portion of the case 2) ) May be made of a metal material. In addition, even if it consists of a metal material, it can shape | mold easily by press work, for example.

  In the above embodiment, the fins 13f are integrally formed with the insulator 13 attached to the core 9 of the rotor 6. However, the present invention is not limited to this. You may fix and provide to the core 9 grade | etc.,.

The technical idea that can be grasped from the above embodiment will be described below together with the effects thereof.
(A) The motor according to any one of claims 1 to 4, wherein the fin is integrally formed with an insulator attached to a core of the rotor.

  According to this configuration, since the fin is integrally formed with the insulator attached to the core of the rotor, it can be avoided that the fin increases the number of parts and the number of assembling steps.

  2 ... Case, 6 ... Rotor, 13f ... Fin, 21 ... Inclined surface, 22 ... Step surface, 23 ... Ventilation hole.

Claims (4)

Case and
A rotor housed in the case;
A motor that is housed in the case and includes a fin that rotates integrally with the rotor;
On the inner surface of the axial end portion of the case, an inclined surface inclined so as to gradually deepen in the axial direction along the circumferential direction, and the inclined surface from the radially inner side of the inclined surface at the deepest portion of the inclined surface And a step surface extending substantially along the axial direction in the range to the radially outer side of
The motor according to claim 1, wherein a vent hole communicating with the inside and the outside is formed at a position corresponding to the deepest portion of the inclined surface and the step surface on the side surface in the direction perpendicular to the axis of the case. The motor according to claim 1,
The stepped surface is formed to be inclined with respect to the radial direction when viewed from the axial direction so as to reflect the wind flowing along the inclined surface outward in the radial direction. The motor according to claim 1 or 2,
A motor in which a plurality of sets of the inclined surface, the stepped surface, and the ventilation hole are formed in the circumferential direction. The motor according to claim 3, wherein
The wall constituting the deepest portion of the inclined surface, the wall constituting the stepped surface, and the wall constituting the shallowest portion of the inclined surface were continuously formed in this order with a substantially constant plate thickness. A motor characterized by

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