JP2010098920A - Motor and ventilating fan using the same - Google Patents

Abstract

An electric motor capable of improving productivity such as positioning of a winding frame and crossover processing of a winding and improving performance and reliability.
An iron core having a yoke portion and a plurality of teeth portions, and a plurality of outer walls and an inner wall forming a winding portion for winding wound around each of the plurality of teeth portions. The first and second reels 41 and 46 that are integrally formed and fit on both axial sides of the plurality of tooth portions 31, respectively, and an insulating film 99 that covers the axial center portion of the teeth portion 31. .
[Selection] Figure 4

Description

  The present invention relates to a small electric motor suitable for driving an impeller, and more particularly to an electric motor having two winding frames mounted so as to sandwich a tooth portion of an iron core from both sides and a ventilation fan using the same.

  In a stator core of an electric motor, a tooth portion, in which a winding is wound to form a magnetic pole, extends from an annular yoke portion toward a central rotor. The operation of winding the winding around the teeth portion is not an easy operation. In order to facilitate the winding work, various proposals have been conventionally made. As one of them, a so-called outer-winding type stator in which the teeth portion can be separated from the yoke portion, the winding is wound around the teeth portion from the outside, and the teeth portion is fitted into the yoke portion after the winding is finished. An iron core has been proposed.

  In the stator core having such a structure, the teeth portion is opposed to the rotor on the inner side and is joined to the yoke portion on the outer side. Therefore, the winding frame used when winding the winding around the tooth portion is divided into two in the axial direction, and the tooth portion is sandwiched between the two winding frames (see, for example, Patent Document 1).

  In addition, conventionally, the fixing unit includes four divided cores a in which the teeth and yokes are integrally laminated, and four divided cores b in which the yokes sandwiched between the divided cores a are laminated. A stack of the split cores a, including a core, four slot insulating films that respectively insulate four slots formed by the adjacent split cores a, and a flange that sandwiches the slot insulating films. It consists of an insulator (winding frame) in which the end face in the direction is insulated and the inner and outer walls are integrally molded with resin, etc., and extends in the stacking direction of the stator core on a part of the flange provided on the insulator. There is a stator of a capacitor motor formed by forming a protrusion to be provided. This stator has a structure in which an insulating film is sandwiched between insulators (winding frames) divided in two in the axial direction. The stator serves as an insulator provided separately for each of the four tooth portions. It has a structure that includes a frame and can be assembled after winding a winding around a tooth portion (see, for example, Patent Document 2).

JP 2005-012875 A JP 2005-027443 A

  The winding frame for winding the winding usually has an inner wall and an outer wall in the winding part in order to prevent the wound winding from being collapsed, to prevent collapse, and to improve workability when winding. ing. Since the winding frame itself is resin-molded, a predetermined draft is necessary in the molding direction, and the wall thickness is not uniform in the axial direction. In the winding frame having such a structure, when the two winding frames are fitted in the axial direction with the teeth portion interposed therebetween, the divided outer wall portions are overlapped with each other on the fitting side front end. In the conventional winding frame, this overlapping portion has a problem that the cross-sectional area of the portion where the winding is wound is reduced by the thickness of each. In addition, when using iron cores having different lamination thicknesses (axial dimensions), there is a problem in that it is necessary to prepare a reel in accordance with the lamination thickness each time. Further, when the axial dimension becomes long, it is necessary to set a large draft angle of the molding, and further, a cross-sectional area of a portion where the winding is wound is reduced.

  In the case of the reel having such a structure, when an insulating film is installed between the reels divided in two in the axial direction, the axial dimensions of the respective reels are the same, and the laminated thickness of the stator cores is different. This can be dealt with by changing the width of the insulating film. However, in the case where a plurality of reels are provided corresponding to each of the plurality of teeth and the insulating film is sandwiched, the trouble of attaching the reel is only the number of teeth portions, and each is independent. There is a problem that positioning is difficult. Further, when winding the windings, it becomes difficult to process the crossovers between the windings.

  The present invention has been made in view of the above, and when winding a winding, without reducing the cross-sectional area of the portion wound with the winding determined by the shape of the winding frame, the winding frame It is an object of the present invention to obtain an electric motor and a ventilation fan using the same that can improve the productivity of positioning and wire crossover processing, and improve performance and reliability.

  In order to solve the above-described problems and achieve the object, the present invention includes an iron core having a yoke portion and a plurality of teeth portions, and a winding portion for windings wound around each of the plurality of teeth portions. A plurality of outer walls and inner walls to be formed, each of which is integrally formed and includes first and second winding frames which are fitted to both sides in the axial direction of the plurality of teeth portions; and an axially central portion of the teeth portions. And an insulating film for covering.

  According to this invention, a cross-sectional area of a portion of the winding frame on which the winding is wound is sufficiently secured, and an electric motor with improved performance and reliability while improving productivity such as assembly and positioning of the winding frame is obtained. There is an effect that it is.

  Since the first and second reels are integrated with each tooth, the mounting work is performed once regardless of the number of teeth, and positioning between the teeth and the reel is easy. Improves. Further, since the winding frames are integrated, operations such as crossover processing of the windings wound around each winding frame are facilitated. Furthermore, if the insulating film is also integrated, the insulating film is attached only once, and workability is improved. Even if the insulating film is disposed between the stator core and the winding frame or between the winding frame and the winding wire, the same effect can be obtained depending on the work process.

  The first and second winding frames can have the minimum axial length regardless of the laminated thickness of the iron core, the draft of the molding can be minimized, and the portion overlapping the winding portion can be minimized. The thickness is also minimized, and the cross-sectional area of the portion where the winding is wound is not reduced. As the insulating film disposed together with the first and second reels, it is preferable to use a film thinner than the thickness of the overlapping part of the reels.

  DESCRIPTION OF EMBODIMENTS Embodiments of an electric motor according to the present invention and a ventilation fan using the same will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment FIG. 1 is a longitudinal sectional view showing an embodiment of a ventilation fan 90 according to the present invention. As shown in FIG. 1, the ventilation fan 90 of embodiment is attached to the ventilation opening formed in the wall part or ceiling part etc. which partition the indoor and outdoor of a building, for example, and ventilates indoor air. The ventilation fan 90 is attached to a ventilation opening and has a casing (bell mouth) 92 that forms a ventilation path (air flow path) 91 therein, and a blower 95 that is installed in the casing 92 and forcibly moves air through the ventilation path 91. And. The blower 95 includes an electric motor 80 and an impeller 93 attached to a drive shaft 81 of the electric motor 80.

  FIG. 2 is a longitudinal sectional view showing the internal structure of the embodiment of the electric motor 80 according to the present invention. As shown in FIG. 2, the electric motor 80 includes a rotor 10 supported by a drive shaft 81 and disposed at the center of the electric motor 80, a stator 20 in which the rotor 10 is disposed, a rotor 10, A front bracket 82 and a rear bracket 83 that house the stator 20 are provided. The stator 20 includes a substantially cylindrical stator core 30 formed by laminating a large number of thin steel plates, and a stator winding 50 wound around a tooth portion of the stator core 30.

  The rotor 10 is rotatably supported by two bearings. That is, the electric motor 80 includes a front bearing 84 and a rear bearing 85 in which an outer ring is fitted and fixed to a recess formed in the center of each of the front bracket 82 and the rear bracket 83 and an inner ring is fitted and fixed to the drive shaft 81. ing.

  FIG. 3 is a perspective view showing an embodiment of the stator core 30. As shown in FIG. 3, the stator core 30 has four teeth portions 31 having a substantially T-shaped cross section and a cylindrical shape, and the outer end portions of the four teeth portions 31 are formed on the inner peripheral side. Engaging engagement portions are formed, and the four teeth portions 31 are mechanically and magnetically coupled to each other to form a peripheral magnetic path. The teeth part 31 can be attached to and detached from the yoke part 32. The teeth part 31 and the yoke part 32 are formed by laminating a large number of thin steel plates in the axial direction (thickness direction).

  FIG. 4 is an exploded perspective view of the tooth portion 31, the winding frame 40 covering the tooth portion 31, and the insulating film 99. As shown in FIG. 4, each of the winding frames (for example, a resin insulator corresponding to the insulation class E) 40 is provided so as to integrally cover (insulate) the four tooth portions 31 in the axial direction of the electric motor 80. Four teeth portions 31 formed by two winding frames of a first winding frame 41 and a second winding frame 46, which are integrally formed, fitted to both side portions in the axial direction and removed from the yoke portion 32. When the stator winding 50 is wound around the tooth portion 31, the stator core 30 and the stator are fixed together with the insulating film 99 (for example, a film corresponding to the insulation class E) 99. Insulates from the winding 50 (see FIG. 2).

  FIG. 5 is a perspective view of the winding frame 40 and the insulating film 99 that are fitted to both side portions in the axial direction of the tooth portion 31. As shown in FIG. 5, the first winding frame 41 fitted to the tooth portion 31, the insulating film 99 covering the central portion of the tooth portion 31, and the second winding frame 46 are portions surrounding each tooth portion 31. In addition, a winding part (concave part) 44 around which the stator winding 50 is wound is formed. On the inner side and the outer side in the radial direction of the winding portion 44, when winding the winding portion 44, the winding portion is easily guided to the winding portion 44, and a large amount is added to the winding portion 44. Outer walls 42 and 47 and inner walls 43 and 48 are formed in order to prevent the wound stator winding 50 from falling down or being collapsed. In other words, the outer walls 42 and 47 and the inner walls 43 and 48 form a winding portion 44 for the winding 50 wound around each of the plurality of tooth portions 31.

  6 is a perspective view showing a state in which the stator winding 50 is wound around the assembly of the tooth portion 31, the winding frame 40, and the insulating film 99 shown in FIG. 5, and FIG. 7 is an assembly shown in FIG. It is a perspective view which shows the state which fitted the yoke part 32 in the. As shown in FIGS. 6 and 7, the stator winding 50 is wound around the winding portion 44 shown in FIG. The stator winding 50 is composed of a main winding 51 and an auxiliary winding 53. The main winding 51 is divided into two windings and wound around two opposing winding portions 44. Similarly, the auxiliary winding 53 is divided into two windings and is wound around the two opposing winding portions 44. The two opposing main windings 51 and the two opposing auxiliary windings 53 are connected by a crossover (not shown). After the winding of the winding ends, the yoke portion 32 is fitted and attached to the outer end portion of the tooth portion 31.

  8 is a side view of the outer wall portions 42 and 47 of the first and second winding frames 41 and 46 and the insulating film 99. FIG. 9 is a side view of the first and second winding frames 41 and 46 and the insulating film 99. And FIG. 10 is a side view showing a state of fitting with the teeth portion 31 sandwiched therebetween, FIG. 10 is a side view of the outer wall portions 142 and 147 of the conventional reel shown in comparison with FIG. 8, and FIG. FIG. 10 is a side view showing a state in which leading ends 142b and 147b of the conventional reel shown in comparison with FIG. 9 overlap each other.

  As shown in FIGS. 8 and 9, the overlapping portions 42 c and 47 c at the fitting side tips of the outer wall portions 42 and 47 are tapered in the side portions 42 a and 47 a so that the width becomes narrower toward the tip portion. . The end portions of the insulating film 99 are overlapped with the overlapping portions 42c and 47c at the fitting side tips of the outer wall portions 42 and 47, respectively.

  As shown in FIGS. 10 and 11, in the conventional winding frame, the outer wall portions 142 and 147 overlap each other. Therefore, the cross-sectional area of the portion where the winding is wound is reduced by the thickness of the overlapping outer wall portions 142 and 147, and the winding amount is limited. In addition, when using stator cores having different lamination thicknesses, it is necessary to prepare a winding frame suitable for the lamination thickness. Further, when the laminated thickness is thick, the axial dimension of the winding frame becomes long, and it is necessary to set a large draft angle for molding. For this reason, the cross-sectional area of the portion where the winding is wound is further reduced, which causes the performance of the motor to deteriorate.

  Moreover, in the thing of the patent document 2 which mounts a separate winding frame to each of several teeth parts, and clamps each insulating film, the effort to mount a winding frame is only required for the number of teeth parts, and Since each of them is independent, it is difficult to position each of them, and furthermore, it is difficult to handle the crossover after winding the winding, resulting in poor productivity.

  In the present embodiment, the tip corners 42b and 47b of the overlapping portions 42c and 47c at the mating side tips are located at positions inside the insulating film 99 by a predetermined amount from the outer width of the outer walls 42 and 47. The cross-sectional area of the portion where the winding is wound is not reduced by the thickness of each of the overlapping portions 42c and 47c.

  FIG. 12 is a cross-sectional view of a winding portion in which the first and second winding frames 41 and 46 and the insulating film 99 cover the tooth portion 31, and FIG. 13 is a cross-sectional view showing another form of the winding portion. As shown in FIG. 12, both end portions in the axial direction of the insulating film 99 may be arranged so as to overlap the inner walls 43, 48 of the first and second winding frames 41, 46, or as shown in FIG. In addition, one axial end of the insulating film 99 is disposed so as to overlap the inner wall 43 or 48 of one of the first and second winding frames 41 and 46, and the other axial end is , And may be arranged so as to overlap the outside of the other inner wall 43 or 48.

  14 is a perspective view of the insulating film 99 alone, and FIG. 15 is a perspective view showing a state in which a plurality of insulating films 99 are integrated by a connecting portion 99a. If the plurality of insulating films 99 are integrally connected by the connecting portion 99a, the plurality of insulating films 99 can be attached at one time at the same time.

  In addition, although the 1st, 2nd winding frames 41 and 46 and the insulating film 99 of embodiment cover the stator core 30, you may apply to the winding frame of a rotor core. That is, it is divided in such a way that it can be fitted in the axial direction, and the iron core is covered with both sides to insulate the winding wound around the tooth portion from the iron core and prevent the winding from being collapsed. A reel of the form can be applied.

  Moreover, although the side part of the overlap parts 42c and 47c of this Embodiment has comprised the diagonal straight line shape, it is not limited to a straight line, For example, a smooth curve may be sufficient. That is, the overlapping portions 42c and 47c and the insulating film 99 of the present embodiment may improve the insertability by, for example, making the tip of the outer wall portion as a whole arcuate.

  As described above, the electric motor according to the present invention is useful for a ventilation fan.

It is a longitudinal section showing an embodiment of a ventilation fan concerning the present invention. It is a longitudinal cross-sectional view which shows the internal structure of embodiment of the electric motor concerning this invention. It is a perspective view which shows embodiment of a stator core. It is a disassembled perspective view of a teeth part, the winding frame which covers this, and an insulating film. It is a perspective view of the winding frame and insulating film which were fitted by the teeth part. It is a perspective view which shows the state which wound the stator coil | winding to the assembly of the teeth part, winding frame, and insulating film shown in FIG. It is a perspective view which shows the state which fitted the yoke part in the assembly shown in FIG. It is a side view of the outer wall part of a 1st, 2nd winding frame, and an insulating film. It is a side view which shows the state which the 1st, 2nd winding frame and the insulating film fitted on both sides of the teeth part. It is a side view of the outer wall part of the conventional winding frame shown in comparison with FIG. FIG. 10 is a side view showing a state where the leading ends of the conventional reel shown in comparison with FIG. 9 overlap each other. It is sectional drawing of the winding part which a 1st, 2nd winding frame and an insulating film cover a teeth part. It is sectional drawing which shows the other form of a winding part. It is a perspective view of an insulating film simple substance. It is a perspective view which shows the state which integrated the some insulating film by the connection part.

Explanation of symbols

10 Rotor 20 Stator 30 Stator core (iron core)
31 Teeth part 32 Yoke part 40 Winding frame (insulator)
41 first winding frame 42 outer wall of first winding frame 42a side portion of outer wall 42b tip corner portion of first winding frame 42c overlapping portion of first winding frame 43 inner wall of first winding frame 44 winding of winding Winding portion 46 Second winding frame 47 Outer wall of second winding frame 47a Side portion of outer wall 47b Tip corner portion of second winding frame 47c Overlapping portion of second winding frame 48 Inner wall of second winding frame 50 Fixed Sub winding 51 Main winding 53 Auxiliary winding 80 Electric motor 81 Drive shaft 82 Front bracket 83 Rear bracket 84 Front bearing 85 Rear bearing 90 Ventilation fan 91 Ventilation path 92 Casing 93 Impeller 95 Blower 99 Insulating film 99a Insulating film connecting portion

Claims (6)

An iron core having a yoke part and a plurality of teeth parts;
Each of the plurality of teeth has a plurality of outer and inner walls that form a winding for a winding wound around each of the plurality of teeth, and is formed integrally with each other and fitted to both axial sides of the plurality of teeth. First and second reels,
An insulating film covering an axially central portion of the teeth portion;
An electric motor comprising:   2. The electric motor according to claim 1, wherein an axial end portion of the insulating film is disposed so as to overlap an inner wall of the first and second reels.   One end in the axial direction of the insulating film is disposed so as to overlap the inside of one inner wall of the first and second reels, and the other end in the axial direction overlaps the outside of the other inner wall. The electric motor according to claim 1, wherein   The electric motor according to claim 1, wherein the insulating film is integrally connected by a connecting portion.   The teeth portion is attachable to and detachable from the yoke portion, and after the winding is wound in a state where the first and second winding frames and the insulating sheet are attached after being removed from the yoke portion, The electric motor according to claim 1, wherein the electric motor is attached to the yoke portion.   A ventilation fan comprising the electric motor according to any one of claims 1 to 5.

Images