JP6669004B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electric machine.

  Patent Literature 1 discloses a rotating electric machine including an annular stator core and a plurality of coils each including a conductive wire wound around a plurality of teeth formed on an inner peripheral surface of the stator core.

JP 2014-230293 A

  In a rotating electric machine as described in Patent Document 1, usually, a coil is fixed to a stator core by a mold structure. Specifically, after attaching the coil to the stator core, the stator core is housed in a mold, and the outside of the stator core is covered with the resin by injecting a resin such as a thermosetting resin into the cavity. Thus, the coil is fixed to the stator core.

  However, when the entire stator core is covered with the mold resin, the entire coil is also covered with the resin, so that the cooling efficiency of the motor may be reduced. Further, when the entire stator core is covered with resin, the amount of resin used increases, and the weight of the motor increases. Therefore, in order to improve the cooling efficiency of the motor and reduce the amount of resin used, it is desired to partially fix the coil with resin instead of covering the entire coil with resin.

  When the coils are partially fixed with resin, a resin serving as an adhesive is poured into a gap between adjacent coils, and the adhesive is cured, thereby fixing the coils to the stator core and fixing the adjacent coils. . However, since the adhesive is heated when it is cured, the heating reduces the viscosity of the adhesive. Therefore, there is a possibility that the adhesive drips and the required area of the coil cannot be fixed by the adhesive.

  The present invention has been made in order to solve such a problem, and provides a rotating electric machine that can prevent dripping of an adhesive and can fix a necessary area of a coil with the adhesive. It is intended to do so.

  A rotating electric machine according to the present invention includes an annular stator core, and a plurality of coils each including a conductive wire wound around a plurality of teeth formed on an inner peripheral surface of the stator core. Further, the adhesive poured into the gap between the adjacent coils is cured, so that the coils are fixed. The rotating electric machine further includes a correlation plate that abuts on the adjacent coil and closes the gap in a gap between the adjacent coils.

  According to the rotating electric machine according to the present invention, the correlation plate abuts on adjacent coils to close a gap between adjacent coils. Therefore, even if the viscosity of the adhesive is reduced by heating when the adhesive poured into the gap between the adjacent coils is cured, the adhesive is blocked by the correlation plate. For this reason, it is possible to provide a rotating electric machine that can prevent the adhesive from dripping and can fix the required area of the coil with the adhesive.

It is a perspective view showing the appearance of a stator. FIG. 2 is a perspective view of the stator according to Embodiment 1 of the present invention as viewed from the inside diameter side. FIG. 2 is a perspective view showing a correlation plate according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the stator according to Embodiment 1 of the present invention as viewed from the inside diameter side. FIG. 5 is a sectional view taken along the line VV in FIG. 4. FIG. 3 is a plan view showing a correlation plate according to Embodiment 1 of the present invention. FIG. 9 is a perspective view illustrating a correlation plate according to a second embodiment of the present invention. FIG. 10 is a plan view of a stator according to Embodiment 2 of the present invention as viewed from the inner diameter side. FIG. 7 is a plan view showing a correlation plate according to Embodiment 2 of the present invention.

Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view illustrating an appearance of a stator 1 of the rotating electric machine according to the first embodiment. FIG. 2 is a perspective view of the stator according to the first embodiment as viewed from the inner diameter side. The rotating electric machine according to the first embodiment includes stator 1 shown in FIG. As shown in FIG. 1, the stator 1 includes an annular stator core 2 and a plurality of coils 10. The stator core 2 includes a ring portion 4 formed in an annular shape, and a plurality of teeth 6 (projections) protruding from the ring portion 4 on the inner diameter side (radially inward of the stator core 2). The stator core 2 is formed by stacking, for example, metal plates punched by a press.

  The teeth 6 are covered with an insulator (not shown). A coil 10 is attached to each of the plurality of teeth 6 covered with the insulator. Specifically, the coil 10 is formed of a conductive wire wound around the teeth 6. Then, a gap 20 is formed between adjacent coils 10 in slots 22 between adjacent teeth 6. In FIG. 1, fifteen teeth 6, coils 10, and gaps 20 (slots 22) are provided, but the number of teeth is not limited to fifteen. The number of the teeth 6, the coils 10, and the gaps 20 (slots 22) can be appropriately set according to the capacity of the motor having the stator 1.

  As shown in FIG. 2, a resin mold portion 30 is formed in the gap 20 (slot 22). Specifically, the resin mold portion 30 is formed by curing the adhesive (resin) poured into the gap 20 between the adjacent coils 10. The coil 10 is fixed by forming the resin mold portion 30. Here, "the coil is fixed" may include both that the stator core 2 (insulator) and the coil 10 are fixed and that the coils 10 adjacent to each other are fixed.

  Here, in the first embodiment, the resin mold portion 30 is not formed so as to cover the entire stator 1. The resin mold portion 30 is partially provided in the gap 20 to such an extent that the coil 10 can be sufficiently fixed. Thus, the coil end portion 12 of the coil 10 is not covered with the resin but is exposed. In the first embodiment, since the coil end portion 12 is exposed, it is possible to improve the cooling efficiency of the motor as compared with the case where the entire coil is covered with resin. Further, in the first embodiment, since the entire stator core 2 is not covered with the resin, it is possible to suppress the amount of resin used and to suppress an increase in the weight of the motor.

  Further, stator 1 of the rotating electrical machine according to the first embodiment further includes a correlation plate 40 in gap 20 between adjacent coils 10. FIG. 3 shows a correlation plate 40 according to Embodiment 1 of the present invention. FIG. 4 is a plan view of the stator 1 according to Embodiment 1 of the present invention as viewed from the inner diameter side. As shown in FIG. 3, the correlation plate 40 includes a substrate 41, a base 42, a blade 43, and the like.

The board part 41 has a plate-like shape that is long in the axial direction of the stator 1. Further, as shown in FIG. 3, the substrate section 41 may have a curved flat surface.
The base 42 has a rod-like shape protruding a predetermined distance from a surface of the substrate 41 on the inner diameter side of the stator 1. In FIG. 3, the base 42 protrudes from the convexly curved surface of the substrate 41. Further, in FIG. 3, two base portions 42 protrude from the board portion 41 along the axial direction of the stator 1.
The blade portion 43 has a plate-like shape having a substantially V-shaped cross-sectional shape. The blade portion 43 is provided so as to protrude from the base portion 42 toward the inner diameter side of the stator 1 and expand from the base portion 42 toward the upper side in the axial direction of the stator 1.
The positions and the numbers of the bases 42 and the blades 43 are not limited to those described above and in FIG. 3. As shown in FIG. 4, the resin mold portion formed in one gap 20 (slot 22) is used. It suffices that the position and the number correspond to the position and the number of 30.

  Then, as shown in FIG. 4, the correlation plate 40 is disposed in the gap 20 between the adjacent coils 10 such that the base 42 is located below the resin mold portion 30. In other words, the correlation plate 40 is disposed in the gap 20 so that the resin mold 30 is included inside the blade portion 43 having a substantially V-shaped cross section. Thus, the blade portion 43 has a role of blocking the adhesive (resin) flowing into the gap 20 (slot 22) between the adjacent coils 10.

  FIG. 5 is a sectional view taken along the line VV of FIG. As shown in FIGS. 4 and 5, a resin mold portion 30 is formed in a gap 20 between adjacent coils 10 in a slot 22 between adjacent teeth 6. Here, when the motor having the stator 1 is operating or when the motor is stopped, the coil 10 of the stator 1 is subjected to, for example, a Lorentz force, a thermal stress, a coil springback or a force due to vibration, etc. The force F acts in the direction opposite to the ring portion 4. However, since the coil 10 is fixed by the resin mold portion 30, even if the force F acts on the coil 10, the coil 10 can be prevented from being displaced by the force F.

  The length of the blade portion 43 of the correlation plate 40 in the inner diameter direction of the stator 1 should be equal to or larger than the length of the resin mold portion 30 in the inner diameter direction of the stator 1 in order to prevent the adhesive that becomes the resin mold portion 30 from dripping. Preferably, there is.

  FIG. 6 shows a plan view of the correlation plate 40 according to the first embodiment. As shown in FIG. 6, the opening width (width along the circumferential direction of the stator core 2) of the blade portion 43 having a substantially V-shaped cross section is equal to or larger than the width of the gap 20 between the adjacent coils 10. As a result, the blades 43 of the correlation plate 40 project in the gap 20 between the adjacent coils 10 in a direction in which the coils 10 are separated from each other. In other words, the end of the blade portion 43 of the correlation plate 40 contacts the adjacent coil 10, and the end of the blade portion 43 and the coil 10 come into close contact with each other. As a result, in the gap 20 between the adjacent coils 10, the blade 43 of the correlation plate 40 blocks a path in which the adhesive that will become the resin mold 30 drips. In other words, the blade portion 43 of the correlation plate 40 functions as a tray for receiving the adhesive.

  The gap 20 between the adjacent coils 10 is generated by accumulating the tolerances of the stator core 2, the insulator, and the coil 10. For example, the width of the gap 20 is at most about 4 mm. The thickness of the conventional correlation plate is about 1 mm. Therefore, an assembling gap (a gap after assembling) of up to about 3 mm is generated between the coil 10 and the conventional correlation plate.

  Next, a method of manufacturing stator 1 of the rotating electric machine according to the first embodiment will be briefly described. First, the coil 10 is attached to the teeth 6 of the stator core 2.

  Next, the correlation plate 40 is attached to the stator core 2. Specifically, the correlation plate 40 is inserted into the slot 22 between the adjacent teeth 6 of the stator core 2. More specifically, the correlation plate 40 is inserted into the slot 22 so that the blade portion 43 of the correlation plate 40 is sandwiched in the gap 20 between the adjacent coils 10. For example, the correlation plate 40 is inserted into the slot 22 along the axial direction of the stator core 2.

Next, after heating the coil 10 and the stator core 2, a resin serving as an adhesive is injected into the gap 20 (slot 22) between the adjacent coils 10. The adhesive is cured by the heat of the coil 10 and the stator core 2 to form the resin mold portion 30.
Note that, for example, an adhesive may be injected into the gap 20 (slot 22) by an apparatus and a method described in JP-A-2016-135084. Further, the adhesive may be injected along the radial direction from the inner diameter side of the stator core 2 or may be injected along the axial direction from above the stator core 2 in the axial direction.
As the adhesive, various resins such as an epoxy resin, a silicon resin, a urethane resin, and an acrylic resin can be used.

  According to the rotating electric machine according to the first embodiment described above, correlator plate 40 abuts on adjacent coils 10 to close gap 20 between adjacent coils 10. Specifically, since the width of the blade portion 43 of the correlation plate 40 along the circumferential direction of the stator core 2 is equal to or greater than the width of the gap between the adjacent coils 10, the correlation plate 40 contacts the adjacent coils 10 and The correlation plate 40 and the coil 10 come into close contact with each other. Thereby, the gap 20 between the adjacent coils 10 is closed by the correlation plate 40. Therefore, even if the viscosity of the adhesive is reduced by heating when the adhesive poured into the gap 20 between the adjacent coils 10 is cured, the adhesive is blocked by the correlation plate 40. For this reason, it is possible to provide a rotating electric machine that can prevent the adhesive from dripping and can fix the required range of the coil 10 with the adhesive.

  When the resin mold portion 30 unnecessarily extends downward due to the dripping of the adhesive, it is necessary to trim the extended portion. In the first embodiment, the dripping of the adhesive is performed. Is prevented, so the trouble of the trimming can be saved.

Embodiment 2
Next, a correlation plate 40A provided in the rotating electric machine according to Embodiment 2 will be described with reference to FIGS. FIG. 7 is a perspective view showing a correlation plate 40A according to the second embodiment. FIG. 8 is a plan view of the stator 1 according to Embodiment 2 as viewed from the inside diameter side. FIG. 9 is a plan view showing a correlation plate 40A according to the second embodiment. As shown in FIGS. 4 to 9, only the shape of blade portion 43 </ b> A of correlation plate 40 </ b> A in the rotary electric machine according to the second embodiment is different from correlation plate 40 in the rotary electric machine according to the first embodiment. Therefore, the same reference numerals are used for the same configuration, and the description is omitted.

As shown in FIG. 7, the blade portion 43 </ b> A has a plate-like shape having a substantially I-shaped oblique cross-sectional shape. The blade 43A is provided so as to protrude from the base 42 toward the inner diameter side of the stator 1 and to extend obliquely upward from the base 42 in the axial direction of the stator 1. In addition, the blade part 43A may have a curved plate-like shape having an arc-shaped cross-sectional shape.
Then, as shown in FIG. 8, the correlation plate 40 </ b> A is disposed in the gap 20 between the adjacent coils 10 so that the base 42 is located below the resin mold part 30. In other words, the correlation plate 40A is disposed in the gap 20 such that the resin mold 30 is located on the blade portion 43A having a substantially I-shaped cross-sectional shape in oblique. Thus, the blade portion 43A has a role of blocking the adhesive (resin) flowing into the gap 20 (slot 22) between the adjacent coils 10.

  In addition, the length of the blade portion 43A of the correlation plate 40A in the inner diameter direction of the stator 1 is not less than the length of the resin mold portion 30 in the inner diameter direction of the stator 1 in order to prevent the adhesive forming the resin mold portion 30 from dripping. Preferably, there is.

  FIG. 9 shows a plan view of a correlation plate 40A according to the second embodiment. As shown in FIG. 9, the inclined width (width along the circumferential direction of the stator core 2) of the blade portion 43 </ b> A having an obliquely I-shaped cross-sectional shape is equal to or larger than the width of the gap 20 between the adjacent coils 10. Thereby, the blade portion 43A of the correlation plate 40A is stretched in the gap 20 between the adjacent coils 10 in a direction in which the coils 10 are separated from each other. In other words, the end of the blade 43A of the correlation plate 40A contacts the adjacent coil 10, and the end of the blade 43A and the coil 10 come into close contact with each other. As a result, in the gap 20 between the adjacent coils 10, the blade 43A of the correlation plate 40A blocks a path in which the adhesive to become the resin mold 30 tends to drip. In other words, the blade portion 43A of the correlation plate 40A serves as a tray for receiving the adhesive.

  According to the rotating electric machine according to the second embodiment described above, it is needless to say that the same effects as those of the rotating electric machine according to the first embodiment can be obtained.

  It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist. For example, in the first and second embodiments, the correlation plates 40 and 40A are described as members separate from the stator core 2, but the correlation plates 40 and 40A and the stator core 2 may be formed integrally. In this case, the step of assembling the correlation plates 40 and 40A after assembling the coil 10 to the stator core 2 is omitted.

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 4 Ring part 6 Teeth 10 Coil 12 Coil end part 20 Crevice 22 Slot 30 Resin mold part 40, 40A Correlation plate 41 Board part 42 Base part 43, 43A Blade part

Claims (1)

A rotating electric machine comprising: an annular stator core; and a plurality of coils each including a conductive wire wound around a plurality of teeth formed on an inner peripheral surface of the stator core,
In the slot between the teeth adjacent to each other, the adhesive poured into the gap formed between the coils adjacent to each other is cured, whereby the coil is fixed,
The gap between the coils adjacent, further comprising a correlation plate for closing the gap in contact with the adjacent coils,
The rotating electric machine , wherein a width of the correlation plate along a circumferential direction of the stator core is equal to or larger than a width of the gap .

Images