JP4279078B2 - Molded motor - Google Patents

Description

  The present invention relates to a wiring structure of a molded motor having a bushing for drawing a lead wire connected to a stator winding to the outside.

In order to pull out the stator winding wound around the stator to the outside, a bushing is built in the frame of the molded motor and the lead wire electrically connected to the stator winding is pulled out by this bushing. (Patent Document 1, Patent Document 2).
JP-A-6-327177 JP-A-9-107659

  The structure of the molded motor 100 having the above wiring structure will be described with reference to FIG.

  As shown in FIG. 7, a stator winding 106 is wound around the slot 104 of the stator 102 of the molded motor 100.

  A plurality of lead wires 110 for connection to the outside are fixed to a bushing 108 made of synthetic resin disposed above the outer peripheral portion of the stator 102. The tip of each lead wire 110 is electrically connected to the end of the stator winding 106 by solder, and this solder connection portion 112 is housed in the wedge of the slot 104 of the stator 102 for insulation fixing. .

  However, since the solder connection portion 112 is housed in the slot 104, the inside of the slot 104 is occupied by the solder connection portion 112, and the occupation ratio for winding the stator winding 106 is limited. There is a point.

  In addition, in order to secure a storage space for the solder connection portion 112, there is a problem that the inner diameter of the stator 102 is enlarged and an optimum design in terms of motor characteristics cannot be performed.

  Furthermore, in order to solve the above problems, it is possible to provide a wiring board and connect the stator winding 106 and the lead wire 110. However, the cost for manufacturing the wiring board increases and the cost increases. There is a problem of doing.

  Therefore, in view of the above problems, the present invention can securely connect the stator winding and the lead wire, and can be connected at a low cost without adversely affecting the characteristics of the motor. Is to provide.

According to a first aspect of the present invention, a stator in which a stator winding is wound around a slot of a stator core, and a separate bushing for drawing out a lead wire connected to the stator winding to the outside are formed by a mold resin. In the molded motor that is molded integrally to form a frame, the bushing extends in a radially outward direction of the stator, and a bushing body that guides the lead wire to an outer peripheral portion of the stator, and an inner end of the bushing body An insertion part formed with a plurality of insertion holes extending along the axial direction of the stator from the part, a fixing plate protruding in the radial direction from the inner end of the bushing body, and fixed to the bushing body, anda lid sandwich the lead wire, the fixing plate includes a central plate portion protruding radially inwardly from the inner end of the bushing body, as extending from both sides of the central plate portion It has a pair of side plate portions extending, and the solder connecting portion and the end portion are connected by solder ends of the stator winding and the lead wire is inserted into the insertion portion, of the central plate portion A fuse is fixed to the upper surface, and a fixing member is provided on each of the pair of side plate portions to fix a solder connection portion in which both legs of the fuse and the lead wire are connected by solder, and the fixing plate is fixed to the fixing plate. The mold motor is characterized in that at least the fixing plate is molded together with the stator by a mold resin in a state of being arranged above the child winding.

A second aspect of the present invention, the cut for the stator winding draw into the insertion portion, or, according to claim 1, characterized that you pull portion formed from holes formed in the central plate portion This is a mold motor.

  In the molded motor according to claim 1, the solder connection portion is made into the bushing only by inserting the solder connection portion in which the end portion of the stator winding and the end portion of the lead wire are connected by solder into the insertion portion of the bushing. Can be fixed.

  The bushing is integrated with the frame by molding the fixing plate together with the stator with a molding resin.

  In the molded motor according to claim 2, the fixed plate is composed of a central plate portion and a pair of side plate portions, and the stator winding can be drawn into the insertion portion by the drawing portion in the central plate portion. A fuse can be arranged on the upper surface of the part. Further, since the pair of side plate portions is provided with a fixing member for fixing the solder connecting portion in which both the leg portions of the fuse and the lead wires are connected by solder, these solder connecting portions can be easily fixed. .

  As described above, in the molded motor of the present invention, the stator winding and the lead wire can be connected in the vicinity of the bushing, the slot occupancy can be increased, and the inner diameter of the stator core can be reduced. The size can be designed according to the characteristics.

  In addition, a fuse can be attached to the fixed plate and wiring can be performed at the same time.

  Hereinafter, a molded motor 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

(1) Structure of Mold Motor 10 First, the structure of the mold motor 10 will be described with reference to FIG.

  The molded motor 10 is an AC motor, and a stator core has a plurality of teeth protruding from the inner periphery of a ring-shaped core, and a slot 14 is formed between the adjacent teeth.

  The insulating core is formed by pre-molding the stator core thus formed with a mold resin.

  A stator winding 16 is wound around each slot 14 of the stator core on which the insulating layer is formed, and the stator 18 is assembled.

  A bushing 22 for connecting the stator winding 16 and the lead wire 20 connected to an external drive circuit or the like is disposed at the upper end of the outer peripheral portion of the stator 18. The stator 18 and the bushing 22 are integrally molded with a mold resin to manufacture the frame 24 of the molded motor 10.

  A rotor (not shown) is arranged inside a cylindrical frame 24 containing the stator 18 via a bearing, and the molded motor 10 is completed.

(2) Structure of Bushing 22 Next, the structure of the bushing 22 will be described with reference to FIGS.

  The bushing 22 is made of synthetic resin and has a bushing body 26 extending in the radially outward direction of the stator 18, an insertion portion 28 extending downward in the axial direction of the stator 18 from the inner peripheral side end of the bushing body 26, and Similarly, the bushing body 26 includes a fixing plate 30 extending inwardly from the inner peripheral end of the bushing body 26.

  The bushing body 26 has a rectangular planar shape, and is provided with a plurality of grooves 32 for guiding a plurality of lead wires 20 to the outer peripheral side of the stator 18 along the radial direction.

  The insertion portion 28 has a plurality of insertion holes 34, and the insertion holes 34 are provided in the axial direction so as to be continuous from the end portions of the grooves 32, and respectively correspond to the plurality of grooves 32.

  The fixed plate 30 is formed by a central plate portion 36 that protrudes radially inward from the bushing body 26 and a pair of side plate portions 38 and 40 that protrude from both side portions of the central plate portion 36 along the circumferential direction. That is, as shown in FIG. 3, the planar shape of the bushing body 26, the central plate portion 36, the side plate portion 38, and the side plate portion 40 is formed in a Y shape.

  A lead hole 42 for pulling the stator winding 16 passes through the central portion of the center plate portion 36, and a support bar 44 protrudes downward along the axial direction from the edge of the lead hole 42. Further, claw portions 72 and 72 for fixing the fuse 62 protrude.

  In the vicinity of both ends of the pair of side plate portions 38, 38, a pair of fixing projections 46, 46, 48, 48 for fixing solder connection portions 65, 70 described later project.

  A lid 50 for covering the bushing body 26 is provided separately from the bushing body 26. As shown in FIG. 5, convex portions 52 and 52 protrude from the lower surfaces of both side portions of the lid body 50 and engage with concave portions 54 and 54 provided on both side portions of the bushing main body 26, so that the lid body 50 is engaged. Fixed. Further, a substantially T-shaped presser plate 56 projects from the inner peripheral side end face of the lid 50, and the lead wire is sandwiched between a plurality of guide projections 58, 58, 58, 58 projecting from the central plate part 36. Fixed.

(3) Usage State of Bushing 22 The usage state of the bushing 22 having the above configuration will be described with reference to FIGS.

  First, as shown in FIG. 6, the support rod 44 of the bushing 22 is inserted in advance between the stator windings 16 to temporarily fix the bushing 22.

  The end portions of the plurality of stator windings 16 are passed from the lower side of the central plate portion 36 through the drawing holes 42 and turned to the upper surface side of the central plate portion 36, respectively. The solder connection portion 60 is formed by electrically connecting the end portion of 16 and the end portion (core wire) of the lead wire 20 guided along the groove 32 of the bushing body 26 by solder. The other lead wires 20 and the stator windings 16 similarly form solder connection portions 60. Then, the formed solder connection portions 60 are respectively inserted into the insertion holes 34 of the insertion portion 28.

  In some cases, a fuse 62 is interposed between the stator winding 16 and the lead wire 20. In this case, as shown in FIG. 3, the solder connection portion 65 is formed by electrically connecting the leg portion 64 on one side of the fuse 62 and the end portion of the lead wire 20 with solder. Similarly, the other leg portion 66 is electrically connected to the end portion of the lead wire 68 by solder to form a solder connection portion 70.

  As shown in FIG. 3, the solder connection portion 62 of the fuse 62 is fixed between the fixing members 46 and 46 of the left side plate portion 38 through the guide protrusions 58 and 58. The fuse 62 is fixed between the claw portions 72 and 72 protruding from the central plate portion 36. The other solder connection portions 70, 70 of the fuse 62 are fixed to the fixing members 48, 48 of the right side plate portion 40 through between the guide protrusions 58. The end portion of the lead portion 68 protruding from the solder connection portion 70 is electrically connected to the end portion of the stator winding 16 by solder to form a solder connection portion 60, and this end is passed between the guide protrusions 58 and 58. The solder connection portion 60 is inserted into the insertion hole 34 and fixed.

  Next, the lid 50 is put on the formed bushing 22 as shown in FIG.

  Finally, as shown in FIG. 1, the bushing 22 and the stator 18 wired as described above are covered with a mold resin to form a frame 24. In this case, molding is performed so that only the bushing body 26 protrudes from the frame 24.

(4) Effects of this Embodiment With the bushing 22 in the molded motor 10 having the above-described configuration, it is not necessary to attach the solder connection portion 60 that is a connection portion between the lead wire 20 and the stator winding 16 at the position of the slot 14. Therefore, since the occupation ratio of the slot 14 is not limited and the inner diameter of the stator core 12 is not limited as in the prior art, the motor characteristics can be improved.

  Further, the stator winding 16 and the lead wire 20 can be connected without using an expensive wiring board.

  Further, since the fuse 62 can be fixed to the central plate portion 36 of the bushing 22, the attachment thereof is facilitated.

(Example of change)
The present invention is not limited to the above-described embodiment, and can be modified without departing from the spirit of the invention. Hereinafter, the example of a change is demonstrated.

(1) Modification 1
In the above embodiment, the drawing hole 42 is provided in the central plate portion 36 for drawing the stator winding 16. However, instead of this, a continuous cut from the inner peripheral side of the central plate portion 36 may be used as the drawing portion.

(2) Modification example 2
In the above embodiment, the AC motor is described as the molded motor. However, another motor may be used, for example, a brushless DC motor.

  The molded motor of the present invention can be used as a drive source for home appliances such as an air conditioner, a pump drive source, a fan device, a blower such as a blower, and the like.

1 is a partially cutaway plan view of a molded motor 10 showing an embodiment of the present invention. It is a perspective view of a bushing. It is a top view of a bushing. It is a bottom view of a bushing. It is a top view of a lid. It is a longitudinal cross-sectional view of a state where a lead wire is attached to the bushing. It is a top view showing the stator and bushing in the conventional mold motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mold motor 12 Stator iron core 14 Slot 16 Stator winding 18 Stator 20 Lead wire 22 Bushing 24 Frame 26 Bushing main body 28 Insertion part 30 Fixing plate 32 Groove 34 Insertion hole 36 Central plate part 38 Side plate part 40 Side plate part 42 Pull-in Hole 44 Support rod 60 Solder connection 62 Fuse

Claims (2)

A frame is formed by integrally molding a stator in which a stator winding is wound around a slot of a stator core and a separate bushing for drawing out a lead wire connected to the stator winding to the outside with a molding resin. In the molded motor to be formed,
The bushing is
A bushing main body extending in a radially outward direction of the stator and guiding the lead wire to an outer peripheral portion of the stator;
An insertion portion in which a plurality of insertion holes extending along the axial direction of the stator is formed from the inner end of the bushing body;
A fixing plate protruding inward from the inner end of the bushing body, and
A lid fixed to the bushing body and sandwiching the lead wire;
Have
The fixing plate is
A central plate projecting radially inward from the inner end of the bushing body;
A pair of side plates extending from both sides of the central plate,
Have
A solder connection portion in which the end portion of the stator winding and the end portion of the lead wire are connected by solder is inserted into the insertion portion,
A fuse is fixed to the upper surface of the central plate part,
Each of the pair of side plate portions is provided with a fixing member for fixing a solder connection portion in which both the leg portions of the fuse and the lead wire are connected by solder,
A mold motor in which at least the fixed plate is molded together with the stator by a mold resin in a state where the fixed plate is arranged above the stator winding.
A notch for drawing the stator winding into the insertion part or a lead-in part formed from a hole is formed in the central plate part.
Molded motor according to claim 1, wherein the this.

Images