JP5951192B2 - Fan motor - Google Patents

Description

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

  Conventionally, demands for water resistance, dust resistance, and the like have been increased, and an axial fan having environmental resistance capable of handling chemical agents has been proposed. Patent Document 1 is an outer rotor type axial flow fan, and a configuration is proposed in which a stator including a coil and mounting components and an entire circuit board are integrally molded with a resin material and then fixed to a case.

  Patent Document 2 discloses an inner rotor type AC fan. In the stator disposed on the outer peripheral portion of the rotor, the core portion is fitted and fixed to the mounting portion protruding from the bottom of the frame.

JP 2006-246557 A JP 60-148352 A

  By the way, in the said patent document 1, since the whole of a stator and a circuit board is integrally molded with a resin material and it fixes to a case, it has environmental resistance. However, this axial fan is an outer rotor type, and in the inner rotor type, the diameter of the stator is relatively large, and since it is the inner peripheral surface of the stator that faces the rotor, the position fixing form is different, There is a problem that the configuration of the outer rotor type cannot be applied as it is.

  Moreover, although the fan motor of patent document 2 is an inner rotor type | mold, since the core and coil of a stator are an insulation coating grade, environmental resistance, such as water resistance and dustproof, is not considered.

  Therefore, it is conceivable to mold the resin as it is on the stator core of the fan motor of Patent Document 2. Here, a rotating blade is disposed on the outer periphery of the stator core, and the rotating blade is held by a cup portion that connects the rotating blade and the rotor. Further, the tip of the cup portion on the side of the rotating blade faces the upper surface of the circumferential wall for positioning the stator. In this configuration, since the side closest to the cup portion is the side surface of the stator core, there is a problem of interference with the cup portion when resin adheres to the side surface of the stator core when the stator is molded with resin.

  Accordingly, an object of the present invention is to provide an inner rotor type fan motor which has no possibility of resin adhering to the side surface of the stator core and has environmental resistance such as water resistance and dust resistance.

The fan motor of the present invention has a stator in which a plurality of coils wound around a core are arranged on the circumference, a circumferential wall surrounding the outer circumferential surface of the stator, and a shaft at the center of the circle of the circumferential wall A rotor that is rotatably supported on the shaft via a bearing on the inner periphery side of the stator, a cup portion that connects the rotor blades disposed on the outer peripheral side of the circumferential wall, and the cup portion. The circumferential wall upper surface that is axially separated from the bottom of the case than the tip of the rotary blade, and the bottom of the case is between the thick wall adjacent to the circumferential wall and the circumferential wall. A thin portion disposed adjacent to the thick portion with the thick portion interposed therebetween, and a corner portion is formed by the circumferential wall and the thick portion, and the core contacts the thick portion. In contact, the stator is positioned at the corner Is, by means of a screw which penetrates the screw hole provided in the thick portion and the core, wherein the stator is fixed to the case, and, the said stator screws and being covered by a tree butter To do.

It said circumferential wall and provided with a gap between the core, the the gap, characterized in that the front Bark fat is filled.

  It is preferable that at least a part of the gap expands from the bottom of the case toward the upper surface of the circumferential wall.

  The structure which provided the enlarged diameter part in the inner peripheral side of the said surrounding wall upper surface is preferable.

  A configuration in which an axial distance from the upper surface of the circumferential wall to the case bottom is larger than an axial distance from the upper surface of the core to the case bottom.

  According to the above configuration, in the inner rotor type fan motor, the mold resin covers at least a part of the upper surface of the circumferential wall that is axially separated from the bottom of the case and the plurality of coils, rather than the tip of the cup on the rotating blade side. The circumferential wall outer peripheral surface is closest to the tip of the cup portion on the rotating blade side. Therefore, it becomes possible to arrange the mold resin only inside the circumferential wall circle, and the tip of the cup portion and the mold resin do not interfere with each other.

  In this configuration, the stator is positioned in the case by the circumferential wall and is fixed to the bottom of the case by the fixing screw. Since the circumferential wall only needs to be able to position the stator, the inner diameter dimension of the circumferential wall can be set so that the stator can be smoothly installed in the circumferential wall, unlike fitting with an interference fit.

  It is also possible to provide a large gap larger than the fitting gap between the stator core and the circumferential wall. As a result, the stator can be installed more smoothly, and the resin molded in the gap can be guided to prevent the resin from flowing to the outside of the circumferential wall. can do.

  Furthermore, at least a part of the gap provided between the core of the stator and the circumferential wall expands from the bottom of the case toward the upper surface of the circumferential wall, so that the resin can be introduced more reliably.

  Also, the axial distance from the top surface of the circumferential wall to the bottom of the case is made larger than the axial distance from the top surface of the core to the bottom of the case, and the moving pressure of the resin at the time of molding is brought closer to the core side, thereby completing the molding. The resin can be prevented from protruding beyond the circumferential wall to the cup side.

  According to the present invention, even if the resin covering the exposed portion of the stator including at least a plurality of coils is molded by providing the circumferential wall that is disposed closest to the tip of the cup portion on the rotating blade side, the tip of the cup portion and the mold are molded. It is possible to provide an inner rotor type fan motor having environment resistance such as water resistance and dust resistance without interference of resin.

It is sectional drawing of one side from the centerline of the inner rotor type | mold fan motor which is 1st embodiment concerning this invention. It is sectional drawing of one side from the centerline of the inner rotor type fan motor which is 2nd embodiment concerning this invention. It is the fragmentary sectional view which showed the other shape of the circumferential wall upper surface part of FIG. It is the fragmentary sectional view which showed the other shape of the circumferential wall upper surface part of FIG.

Hereinafter, a preferred embodiment of an inner rotor type fan motor according to the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of an inner rotor type fan motor according to a first embodiment of the present invention.

  The fan motor 100 roughly includes a case 110, a stator 130 fixed to the case 110, a rotating blade 120 that generates cooling air by rotation, and a rotor 160.

A shaft 150 is fixed at the center of the bottom 112 of the case 110, and a circumferential wall 114 is provided around the shaft 150 so as to surround the outer circumferential surface of the stator 130. In this embodiment, this circumferential wall 114 positions the stator 130. The stator 130 has a configuration in which a plurality of coils 132 wound around a core 134 to which an insulating material is attached are arranged on the circumference around the shaft 150. The stator 130 is fixed to the bottom 112 of the case 110 by a fixing screw 118 that passes through the core 134 . The bottom portion 112 is thick at a location where a screw hole is provided.

The shaft 150 is provided with a pair of bearings 152. The rotor 160 is formed of an aluminum die-cast squirrel-cage rotor having a skew, and is rotatably held on the shaft 150 on the inner peripheral side of the stator 130 via a bearing 152. That is, the drive unit of the fan motor of this embodiment constitutes an induction motor.
The rotary blade 120 is disposed on the outer peripheral side of the circumferential wall 114. The rotary blade 120 is connected to the rotor 160 by a cup portion 122 having a shape straddling the stator 130.

The upper surface 116 of the circumferential wall 114 is provided at a position higher than the rotating blade side tip 124 of the cup portion 122 on the rotating blade 120 side when viewed from the bottom portion 112 of the case 110. That is, the axial distance from the bottom 112 to the circumferential wall upper surface 116 is set larger than the axial distance from the bottom 112 to the rotary blade side tip 124 of the cup 122. At least a part of the upper surface 116 and an exposed portion of the stator 130 including at least the plurality of coils 132 are covered with a mold resin 138.

  According to this configuration, the upper surface 116 of the circumferential wall 114 is provided at a position higher than the front end 124 of the cup portion 122 on the rotary blade 120 side from the bottom portion 112 of the case 110 as described above. The closest is the outer peripheral surface of the circumferential wall. Therefore, the mold resin 138 can be arranged only inside the circle of the circumferential wall 114, and the cup portion tip 124 and the mold resin 138 do not interfere with each other.

Here, as a procedure for fixing the stator 130 to the case 110, first, the core 134 is brought into contact with the corner portion 117 between the circumferential wall 114 and the bottom surface. At this time, the inner peripheral surface of the circumferential wall 114 facing the core 134 does not need to be tight fitting dimensions as to fit the core 134 in press-fit. It suffices if positioning at the corner 117 is possible. Next, it fixes to the bottom part 112 with the fixing screw 118 which penetrates the core 134 .
As described above, since the positioning is performed at the corner portion 117 of the circumferential wall 114, the inner diameter dimension of the circumferential wall with a clearance fit is set so that the installation of the stator 130 can be smoothly performed unlike the fitting with the interference fit. be able to.

  The mold resin 138 can sufficiently seal the stator 130 by potting. At that time, a jig (not shown) in contact with the upper surface 116 of the circumferential wall 114 is arranged so that the resin does not flow into the area of the rotary blade 120 and the resin is poured. By using such a jig, the resin does not jump out to the outer peripheral portion of the circumferential wall 114, and the cup portion tip 124 and the mold resin 138 do not interfere as described above. Furthermore, a diameter-enlarged portion corresponding to the slope of FIG. 3 or the step of FIG. 4 can be provided on the inner peripheral side of the upper surface 116 of the circumferential wall 114 to prevent the mold resin from flowing out to the outer peripheral portion of the circumferential wall 114.

Next, a second embodiment of the present invention will be described.
FIG. 2 is a sectional view on one side of the center line of the inner rotor type fan motor according to the second embodiment of the present invention.
As shown in FIG. 2, the fan motor 200 roughly includes a case 210, a stator 230 fixed to the case 210, a rotating blade 120 that generates cooling air by rotation, and a rotor 160. About the rotary blade 120, the cup part 122, the shaft 150, and the rotor 160, since it is the same as that of 1st embodiment, description is used.

A circumferential wall 214 provided on the circumference of the bottom portion 212 of the case 210 around the shaft 150 positions the stator 230. The stator 230 has a configuration in which a plurality of coils 232 wound around a core 234 to which an insulating material is attached are arranged on the circumference around the shaft 150. The stator 230 is fixed to the bottom 212 of the case 210 by a fixing screw 218 that penetrates the core 234 .

The upper surface 216 of the circumferential wall 214 is provided at a position higher than the upper surface 236 of the core 234 when viewed from the bottom 212 of the case 210. That is, the axial distance from the bottom 212 to the circumferential wall upper surface 216 is set larger than the axial distance from the bottom 212 to the upper surface 236 of the core 234 . Further, a gap 239 that is larger than the fitting gap is provided between the circumferential wall 214 and the core 234 . Therefore, positioning of the stator 230 is performed at the corner portion 217. In the present embodiment, the gap 239 has a tapered cross-sectional shape that gradually increases from the bottom 212 toward the upper surface 216 of the circumferential wall 214. However, the cross-sectional shape of the gap is not limited to this embodiment, and may be a cross-sectional shape in which, for example, the gap dimension is partially enlarged.

The mold resin 238 is provided so as to cover from the upper surface 216 of the circumferential wall 214 to the exposed portion of the stator 230 including the plurality of coils 232. As in the first embodiment, the stator 230 is sealed by potting. At that time, a jig (not shown) in contact with the upper surface 216 of the circumferential wall 214 is arranged, and the poured resin first enters the gap 239 and further flows toward the upper surface 236 of the lower core 234. The fluid pressure at the contact portion between the jig and the circumferential wall 214 is low, and the resin can be prevented from jumping out from the contact portion between the jig and the circumferential wall 214. In this way, as shown in FIG. 2, at least a part of the circumferential wall upper surface 216 and the plurality of coils 232 are covered with the mold resin 238. Further, the jig may be in contact with the entire upper surface 216 of the circumferential wall 214 so that the circumferential wall upper surface 216 is not covered with the mold resin 238.

FIG. 3 is a partial cross-sectional view showing another shape of the upper surface portion of the circumferential wall of FIG.
As shown in FIG. 3, the upper surface 216 a of the circumferential wall 214 a is provided with an inclined surface 216 b corresponding to the enlarged diameter portion from the contact position of the mold resin 238 toward the core 234 , and is connected to the inner peripheral surface forming the gap 239. ing. In the molding process having such a configuration, the poured resin flows through the inclined surface 216b, which is the enlarged diameter portion, and further flows into the gap 239. At this time, since the inclined surface 216b does not serve as a resistance, no flow pressure is generated at the contact portion between the jig and the circumferential wall 214a. And it flows to the upper surface 236 side of the lower core 234 . In this way, the resin can be prevented from appearing on the outer periphery of the circumferential wall 214a.

FIG. 4 is a partial cross-sectional view showing another shape of the upper surface portion of the circumferential wall of FIG.
As shown in FIG. 4, on the upper surface 216c of the circumferential wall 214b, a step 216d is provided as an enlarged diameter portion on the core 234 side. In the molding step having such a configuration, the poured resin passes over the contact portion between the jig and the circumferential wall 214b and hits the step 216d, so that the momentum is suppressed. Thereafter, it flows into the gap 239. At this time, the step 216d kills the momentum of the poured resin, but since it does not relate to the contact portion between the jig and the circumferential wall 214b, the flow pressure to the contact portion between the jig and the circumferential wall 214b. Does not occur. And it flows to the upper surface 236 side of the lower core 234 . In this way, the resin can be prevented from leaking to the outer periphery of the circumferential wall 214b.

  Here, a general epoxy resin can be used as the resin material. Other than this, any material can be used as long as the fluidity at the time of molding and the weather resistance after solidification can be secured.

As described above, according to the second embodiment of the present invention, the upper surface 216 of the circumferential wall 214 is provided at a position higher than the front end 124 of the cup portion 122 when viewed from the bottom portion 212 of the case 210. Furthermore, it is provided at a position higher than the upper surface 236 of the core 234 . Therefore, the mold resin 238 does not come out on the outer periphery of the circumferential wall 214, and a fan motor can be provided in which the cup portion front end 124 and the mold resin 238 do not interfere with each other.

  Furthermore, since the circumferential wall 214 is positioned only at the corners 217, unlike the fitting, the inner diameter dimension of the circumferential wall 214 can be set so that the stator 230 can be installed smoothly. Accordingly, the gap 239 can be formed in a tapered shape. Thereby, the flow pressure to the contact part of a jig | tool and the circumferential wall 214 is low, and the fan motor which can prevent that resin protrudes from the contact part of a jig | tool and the circumferential wall 214 can be provided. .

  It should be noted that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.

100, 200 Fan motor 110, 210 Case 114, 214 Circumferential wall 116, 216 Upper surface of the circumferential wall 117, 217 Corner 118, 218 Fixing screw 120, 220 Rotating blade 122 Cup part 124 Tip of the cup part 130, 230 Stator 138, 238 Mold resin 150 Shaft 160 Rotor 236 Upper surface of core 239 Clearance

Claims (5)

A stator that arranges a plurality of coils wound around a core on a circumference;
A case having a circumferential wall surrounding the outer peripheral surface of the stator and having a shaft at the center of the circle of the circumferential wall;
A rotor rotatably supported by the shaft via a bearing on the inner periphery side of the stator;
A cup part connecting the rotor and the rotor disposed on the outer peripheral side of the circumferential wall;
The circumferential wall upper surface that is separated from the bottom of the case in the axial direction than the tip of the cup portion on the rotating blade side, and
The bottom portion of the case includes a thick portion adjacent to the circumferential wall, and a thin portion disposed adjacent to the thick portion with the thick portion sandwiched between the circumferential wall,
A corner is formed by the circumferential wall and the thick part,
With the core in contact with the thick part, the stator is positioned at the corner,
The stator is fixed to the case by a screw passing through the core and a screw hole provided in the thick part, and
Fan motor, characterized in that the said stator screws are covered by the tree fat. Fan motor according to claim 1, wherein the circumferential wall and provided with a gap between the core, the the gap before Bark fat, characterized in that it is filled. The fan motor according to claim 2, wherein the gap expands from the bottom of the case toward the upper surface of the circumferential wall.   The fan motor as described in any one of Claims 1-3 which provided the enlarged diameter part in the inner peripheral side of the said surrounding wall upper surface. 5. The fan motor according to claim 1, wherein an axial distance from the upper surface of the circumferential wall to the case bottom is larger than an axial distance from the upper surface of the core to the case bottom.

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