JP4649131B2 - 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 draw out the stator winding wound around the stator to the outside, a bushing is built in the frame of the molded motor, and this wiring structure leads out the lead wire electrically connected to the stator winding. Patent Documents 1 and 2 disclose the above.
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. 4, 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 the synthetic resin bushing 108 disposed on the outer periphery of the stator 102. The leading end 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 and insulated and fixed.

  However, since the solder connection portion 112 is housed in the slot 104, the inside of the slot 104 is partially occupied by the solder connection portion 112, and the space for winding the stator winding 106 is limited. There's a problem.

  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 cannot be performed in terms of motor characteristics.

  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.

  Accordingly, in view of the above problems, the present invention provides a molded motor that can reliably connect a stator winding and a lead wire at a low cost without adversely affecting the characteristics of the motor.

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 bushing for pulling out a plurality of lead wires connected to the stator winding are integrated with a mold resin. In the molded motor that is molded into a frame, the bushing includes a substantially rectangular bushing body that guides the lead wire in the radial direction of the stator, and a plate-like bushing wiring body that extends from the bushing body And a bushing support part projecting from the back surface of the bushing body, and a lid part for fixing the lead wire to the bushing body, and the stator winding of the stator winding drawn from the end of the bushing wiring body an end portion, said connecting an end portion of the lead wire, disposed the connecting portion on the surface of the bushing wiring body, before the engaging portion provided on the outer peripheral portion of the stator A bushing support portion is inserted, a part of the bushing main body projects outward in the radial direction of the stator, and the bushing wiring body is in close contact with the stator winding, and at least the bushing wiring body is fixed. A mold motor is characterized in that a frame is formed by molding with a resin using a mold resin.

  A second aspect of the present invention is the molded motor according to the first aspect, wherein a guide for guiding the lead wire to the bushing body is provided in the bushing wiring body.

The invention of claim 3, claim 1, characterized in that fixing portions for sandwiching fixing a fuse interposed are provided on the bushing wiring body rear surface between the stator winding and before Symbol leads or 2. The molded motor according to 2.

  A fourth aspect of the present invention is the molded motor according to the first, second, or third aspect, wherein the lid portion is a separate body from the bushing main body.

  A fifth aspect of the present invention is the molded motor according to any one of the first to fourth aspects, wherein the bushing main body is formed with a storage portion to which an overheat protector can be attached after molding.

  In the molded motor according to claim 1, since the end of the stator winding and the end of the lead wire can be connected on the surface of the bushing wiring body arranged on the peripheral surface of the stator, the stator of the slot The space for winding the winding is not limited, and the inner diameter of the stator core can be designed to a size that matches the characteristics of the motor.

  In the molded motor according to claim 2, since the bushing wiring body is provided with a guide for guiding a plurality of lead wires to the bushing body, it is possible to prevent the lead wires from being mixed and to facilitate assembly work. It can be carried out.

  Since the molded motor according to claim 3 has a fixing portion for sandwiching and fixing the fuse on the back surface of the bushing wiring body, the fuse interposed between the stator winding and the lead wire can be easily fixed to the bushing wiring body. In addition, it is possible to prevent the heat of the mold resin from being directly transferred to the fuse when molding, and to prevent the fuse from being destroyed.

  In the molded motor according to the fourth aspect, since the lid portion and the bushing body are separate, the lead wire can be easily fixed to the bushing body.

  Since it has the storage part which can mount | wear with a superheat protector after a mold in the mold motor of Claim 5, it can mount | wear with a superheat protector easily.

(First embodiment)
Hereinafter, the structure of the molded motor 10 which is the 1st Embodiment of this invention is demonstrated based on FIGS. 1-3.

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

  The mold motor 10 is a single-phase AC motor, and the stator core has a plurality of teeth protruding from the inner periphery of the ring-shaped core, and a slot 14 is formed between these adjacent teeth. By doing so, an insulating layer is formed. At the time of this pre-molding, an engagement portion (not shown) for inserting a bushing support portion 30 described later is formed together with the insulating layer.

  A stator winding 16 is wound around each slot 14 of the stator core pre-molded as described above by toroidal winding, and a stator 18 is assembled.

  A bushing 22 for guiding the lead wire 20 connecting the stator winding 16 and an external drive circuit to the outer peripheral portion of the stator 18 is provided on the peripheral surface of the stator 18, and a part of the bushing 22 is provided around the stator 18. It is arranged so as to protrude from the surface. A frame 24 of the molded motor 10 is formed by integrally molding the stator 18 and the bushing 22 portion existing on the peripheral surface of the stator 18 with a mold resin.

  A rotor (not shown) is disposed 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 includes a substantially rectangular bushing body 26, a bushing wiring body 28 that extends from the vicinity of one corner of the bushing body 26, a bushing support 30 that projects from the back surface of the bushing body 26, and the bushing body 26. And the bushing body 26, the bushing wiring body 28, and the bushing support portion 30 are formed by integrally molding a synthetic resin, and the lid body 50 is separated from the bushing body 26. ing.

  The bushing body 26 is provided with three grooves 32 for guiding the three lead wires 20 a to 20 c to the outer peripheral portion of the stator 18.

  The bushing wiring body 28 has a substantially fan shape in plan view, and on the surface of the bushing wiring body 28, three guides 34 for guiding the three lead wires 20 a to 20 c to the bushing body 26 and the lead wires 20 a to 20 c. A claw portion 36 for fixing the fuse 70 protrudes from the guide 34, and a fixing portion 38 for holding and fixing the fuse 70 is provided on the back surface of the bushing wiring body 28.

  Further, the lid 50 provided separately from the bushing body 26 is provided with a groove 52 and a convex portion 54, and this convex portion 54 engages with the concave portion 40 provided in the bushing main body 26. Then, the lid 50 is fixed, and in this state, the groove 32 provided in the bushing body 26 and the groove 52 provided in the lid 50 face each other to form an opening.

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

  The bushing support portion 30 of the bushing 22 is inserted in advance from above into a hole-shaped engagement portion provided on the outer peripheral portion of the stator exposed between the stator windings 16, and a part of the bushing body 26 is fixed. The other part of the bushing body 26 and the bushing wiring body 28 are arranged along the peripheral surface of the stator 18 to temporarily fix the bushing 22 (see FIG. 1).

  Of the three stator windings 16a to 16c, the end of one stator winding 16a and the end of the lead wire 20a are caulked and electrically connected, and the connecting portion 60a is connected to the bushing wiring body 28. Similarly, the end of the stator winding 16b and the end of the lead wire 20b are electrically connected by caulking both ends, and the connection 60b is arranged on the surface of the bushing wiring body 28. To do. In order to interpose the fuse 70 between the lead wire 20c and the stator winding 16c, one leg portion of the fuse 70 and the end portion of the lead wire 20c are connected to the other leg portion of the fuse 70 and the stator winding. The ends of the wires 16a are electrically connected by solder, and the fuse 70 is sandwiched and fixed by a fixing portion 38 provided on the back surface of the bushing wiring body 28.

  The lead wires 20a to 20c are fixed to the surface of the bushing wiring body 28 by a claw portion 36 provided on the guide 34. Further, the lead wires 20a to 20c are formed in the groove 32 and the groove formed in the lid body 50 and the bushing body 26. 52, and is fixed to the bushing body 26.

  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, the bushing main body 26 portion protruding outward in the radial direction of the stator 18 is molded so as to protrude from the frame 24.

  Since the fuse 70 is attached to the back surface of the bushing wiring body 28, when the frame 24 is formed by molding, the heat of the mold resin is prevented from being directly transferred to the fuse 70, thereby preventing the fuse 70 from being destroyed. be able to.

(4) Effects of the present embodiment The bushing in the molded motor 10 having the above-described configuration eliminates the need to attach the connecting portion 60 between the stator winding 16 and the lead wire 20 at the position of the slot 14, so that Since the space for winding the stator winding 16 in the slot 14 is not limited and the inner diameter of the stator core is not limited, the characteristics of the motor can be improved.

  Further, since the stator winding 16 and the lead wire 20 can be connected on the surface of the bushing wiring body 28, the assembly work of the motor is facilitated, and an expensive wiring board or copper plate is not used, which is economical. It is.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 4. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  In the second embodiment, a bushing body 26 portion protruding from the frame 24 and a square hole penetrating the lid body 50 are provided, and the bushing body section 26 and the lid body 50 are fixed to the bushing body 26. The square holes provided in the lid 50 face each other to form the storage portion 72. An overheat protector 74 such as a krixon relay or a thermal protector is attached and fixed to the storage portion 72, and the overheat protector 74 is inserted between one of the three lead wires 20.

  In addition, although the accommodating part 72 is a square hole which penetrates, if not limited to this and the overheat protector 74 can be fixed, the shape may be a recessed part.

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

It is a partial cutaway top view of the mold motor which shows the 1st Embodiment of this invention. It is a perspective view of a bushing. It is a bushing top view. It is a perspective view of the bushing which shows the 2nd Embodiment of this invention. It is a top view showing the stator and bushing in the conventional mold motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mold motor 14 Slot 16 Stator winding 18 Stator 20 Lead wire 22 Bushing 24 Frame 26 Bushing main body 28 Bushing wiring body 30 Bushing support part 32 Groove 34 Guide 36 Claw part 38 Fixing part 40 Recess 50 Lid 52 Groove 54 Convex Part 60 connection part 70 fuse

Claims (6)

A stator is formed by integrally molding a stator in which a stator winding is wound in a slot of a stator core and a bushing for drawing out a plurality of lead wires connected to the stator winding to the outside with a molding resin. In the molded motor
The bushing is
A substantially rectangular bushing body for guiding the lead wire in the radial direction of the stator;
A plate-like bushing wiring body extending from the bushing body;
A bushing support part protruding from the back surface of the bushing body;
A lid for fixing the lead wire to the bushing body;
Have
An end portion of the stator winding, which is drawn from an end of the bushing wiring body, said connecting an end portion of the lead wire, disposed the connecting portion on the surface of the bushing wiring body,
The bushing support portion is inserted into an engaging portion provided on an outer peripheral portion of the stator, a part of the bushing main body projects outward in the radial direction of the stator, and the bushing wiring body is connected to the stator winding. A mold motor in which at least the bushing wiring body is molded together with the stator by a mold resin in a state of being in close contact with the wire.
2. The molded motor according to claim 1, wherein a guide for guiding the lead wire to the bushing body is provided in the bushing wiring body.
The molded motor according to claim 1, wherein a fixing portion for fixing a fuse interposed between the stator winding and the lead wire is provided on the back surface of the bushing wiring body.
The molded motor according to claim 1, wherein the lid is separate from the bushing body.
The molded motor according to any one of claims 1 to 4, wherein a storage part to which an overheat protector can be attached after molding is formed in the bushing body.
The mold motor according to claim 1, wherein the mold motor is a brushless DC motor.

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