JP2017046515A - Stator coil, stator and stator manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator coil capable of improving heat dissipation in a coil end part while holding a shape of the stator coil to some extent.SOLUTION: This stator coil 30 includes: a coil end part 31; a slot housing part 32 housed in a slot 23 of a stator core 21; and a fused coating layer 34 coated on the surface of a winding 33. In the coil end part 31, density in the vicinity of a central part 131 of a cross section of the coil end part 31 is larger than that on the end 132 side of the cross section of the coil end part 31 in a state where the stator coil 30 is assembled into the slot 23. At least, windings 33 in the vicinity of the central part 131 of the cross section of the coil end part 31 are fixed to each other by the fused coating layer 34.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stator coil, a stator, and a method for manufacturing a stator.

  Conventionally, a stator including a stator coil whose surface is covered with a fusion coating layer is known (see, for example, Patent Document 1).

  In the stator described in Patent Document 1, a coil having a predetermined shape is formed by winding a winding whose surface is covered with a fusion layer (a fusion coating layer) in an annular shape. That is, it is considered that the windings are substantially equally spaced. Then, when the winding is energized and heated, the fusion layer coated on the surface of the winding is melted. As a result, the windings of the entire coil (the coil end portion and the slot accommodating portion accommodated in the slot) are fused together, and the entire coil is blocked (the shape of the coil is maintained). The blocked coil is inserted into the stator slot. That is, the coils are inserted into the slots of the stator in a state where all the windings are arranged at substantially equal intervals and are fused by the fusion layer.

Japanese Patent Laid-Open No. 11-18378

  However, in the stator described in Patent Document 1, since the coils are inserted into the slots of the stator in a state where all the windings are arranged at substantially equal intervals and are fused by the fusion layer, the coil In the end portion, the gaps between all the windings are relatively small. For this reason, there is a problem that heat generated from the windings is not easily radiated at the coil end portion.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to improve the heat dissipation at the coil end portion while maintaining the shape of the stator coil to some extent. A stator coil, a stator, and a method for manufacturing the stator are provided.

  In order to achieve the above object, a stator coil according to a first aspect of the present invention is a stator coil formed by assembling a stator core and winding a winding, and comprising a coil end portion and a stator core A slot accommodating portion accommodated in the slot and a fusion coating layer coated on the surface of the winding, and the coil end portion has a cross-section of the coil end portion in a state where the stator coil is assembled in the slot. The density in the vicinity of the central portion is higher than the density on the end portion side of the cross section of the coil end portion, and at least the windings in the vicinity of the central portion in the cross section of the coil end portion are fixed by the fusion coating layer.

  In the stator coil according to the first aspect of the present invention, in the state where the stator coil is assembled in the slot as described above, the density in the vicinity of the central portion of the cross section of the coil end portion is set to the end side of the cross section of the coil end portion. And at least the windings in the vicinity of the central portion of the cross section of the coil end portion are fixed by the fusion coating layer. Thereby, since the windings in the vicinity of the central portion of the cross section of the coil end portion are fixed by the fusion coating layer, the shape of the stator coil (coil end portion) can be maintained to some extent, and the coil end portion Since the density on the end portion side of the cross section is smaller than the density in the vicinity of the central portion (the interval between the windings is increased), the heat dissipation at the coil end portion of the stator coil can be improved. That is, the heat dissipation at the coil end portion can be improved while maintaining the shape of the stator coil to some extent.

  A stator according to a second aspect of the present invention includes a stator core main body, and a stator coil that is formed by winding a winding around the stator core main body. The stator coil includes a coil end portion, a stator core, and the like. The coil end portion includes a cross section of the coil end portion in a state where the stator coil is assembled to the slot. The density in the vicinity of the central portion is higher than the density on the end portion side of the cross section of the coil end portion, and at least the windings in the vicinity of the central portion in the cross section of the coil end portion are fixed by the fusion coating layer.

  In the stator according to the second aspect of the present invention, as described above, in the state where the stator coil is assembled in the slot, the density in the vicinity of the center portion of the cross section of the coil end portion is set to the end side of the cross section of the coil end portion. While making it larger than the density, at least the windings in the vicinity of the center of the cross section of the coil end portion are fixed by the fusion coating layer. Thereby, since the windings in the vicinity of the central portion of the cross section of the coil end portion are fixed by the fusion coating layer, the shape of the stator coil (coil end portion) can be maintained to some extent, and the coil end portion Since the density on the end portion side of the cross section is smaller than the density in the vicinity of the central portion (the interval between the windings is increased), the heat dissipation at the coil end portion of the stator coil can be improved. That is, it is possible to provide a stator capable of improving the heat dissipation in the coil end portion while maintaining the shape of the stator coil to some extent.

  A stator manufacturing method according to a third aspect of the present invention is formed by winding a winding, and includes a coil end portion, a slot accommodating portion accommodated in a slot of the stator core, and a surface of the winding. A step of assembling a stator coil including a fusion coating layer coated on the stator core slot, and pressurizing and heating the winding near the center of the cross section of the coil end portion along the rotation axis direction. The density near the center of the coil end section is larger than the density at the end of the coil end section, and at least the windings near the center of the coil end section are fused together. And fixing with a coating layer.

  In the stator manufacturing method according to the third aspect of the present invention, as described above, the winding near the center of the cross-section of the coil end portion is pressurized and heated along the direction of the rotation axis, whereby the coil end portion is heated. The density in the vicinity of the central portion of the cross section is made larger than the density on the end portion side of the cross section of the coil end portion, and at least the windings in the vicinity of the central portion of the cross section of the coil end portion are fixed by the fusion coating layer. A process is provided. Thereby, since the windings in the vicinity of the central portion of the cross section of the coil end portion are fixed by the fusion coating layer, the shape of the stator coil (coil end portion) can be maintained to some extent, and the coil end portion Since the density on the end portion side of the cross section is smaller than the density in the vicinity of the central portion (the interval between the windings is increased), the heat dissipation at the coil end portion of the stator coil can be improved. That is, it is possible to provide a stator manufacturing method capable of improving the heat dissipation in the coil end portion while maintaining the shape of the stator coil to some extent.

  According to the present invention, as described above, the heat dissipation at the coil end portion can be improved while maintaining the shape of the stator coil to some extent.

It is sectional drawing of the rotary electric machine by one Embodiment of this invention. FIG. 3 is a perspective view of a state where a stator coil according to an embodiment of the present invention is assembled to a slot. It is a figure which shows the stator coil before being pressurized by one Embodiment of this invention. 1 is a cross-sectional view of a stator coil according to an embodiment of the present invention. It is a figure which shows the stator coil of the state temporarily fixed by one Embodiment of this invention. FIG. 3 is a cross-sectional view of a stator coil before being pressed in a state of being disposed in a slot according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Structure of rotating electrical machine)
With reference to FIGS. 1-3, the structure of the rotary electric machine 100 by this embodiment is demonstrated.

  As shown in FIG. 1, the rotating electrical machine 100 includes a rotor 10 (rotor core 11). The rotating electrical machine 100 includes a stator 20 (stator core 21) that is disposed so as to face the outer peripheral surface of the rotor core 11 in the radial direction. As shown in FIGS. 2 and 3, stator core 21 includes a plurality of teeth 22 and a plurality of slots 23 positioned between adjacent teeth 22. The stator core 21 is an example of a “stator core body”.

  A stator coil 30 is assembled in the slot 23 of the stator core 21. In FIG. 3, only one stator coil 30 is shown, but a plurality of stator coils 30 (see FIG. 2) are actually assembled to the stator core 21. The coil 30 is an example of a “stator coil”.

(Coil structure)
Next, the structure of the stator coil 30 will be described with reference to FIGS.

  As shown in FIG. 3, the stator coil 30 includes a coil end portion 31, a slot accommodating portion 32 accommodated in the slot 23 of the stator core 21, and a fusion coating layer 34 (see FIG. 1).

  Here, in this embodiment, as shown in FIGS. 1 and 2, the stator coil 30 is formed by winding a winding wire 33 made of a round wire. Specifically, the stator coil 30 is formed by a reel rotation method in which the winding 33 is wound by rotating a reel (not shown). In the reel rotation type, since the sliding between the windings 33 wound around the winding frame is relatively small, it is possible to prevent the winding 33 from being damaged due to the sliding between the windings 33. It becomes possible.

  Further, in the present embodiment, as shown in FIG. 3, the stator coil 30 includes a two-layer overlapping coil in which the slot accommodating portion 32 is disposed on the outer peripheral side of the slot 23 and the inner peripheral side of the slot 23. Specifically, the stator coil 30 includes a coil portion 30a disposed on one side in the circumferential direction and a coil portion 30b disposed on the other side in the circumferential direction. The coil portion 30a and the coil portion 30b are connected in series by the inter-coil connection line 30c. As shown in FIG. 4, the slot accommodating portions 32 a and 32 b are disposed on the inner peripheral side of the slot 23, and the slot accommodating portions 32 c and 32 d are disposed on the outer peripheral side of the slot 23.

  As shown in FIG. 1, the fusion coating layer 34 is made of a thin film having a thickness t of about 10 μm, and is provided on the entire surface of the winding 33. Further, the fusion coating layer 34 is made of, for example, a polyimide or polyamide resin (adhesive) having high heat resistance.

  Here, in this embodiment, as shown in FIG. 1, the coil end portion 31 is cut in a cross section (a plane along the rotation axis direction) of the coil end portion 31 in a state where the stator coil 30 is assembled in the slot 23. The density in the vicinity of the central portion 131 of the cross section) is larger than the density on the end 132 side of the cross section of the coil end portion 31. At least the windings 33 in the vicinity of the central portion 131 of the cross section of the coil end portion 31 are fixed (self-fused) by the fusion coating layer 34. Specifically, at least a part of the coil end portion 31 on the side of the end portion 132 is not fixed to the windings 33, and the windings 33 in the vicinity of the central portion 131 of the coil end portion 31 are It is fixed by the fusion coating layer 34.

  Specifically, in almost all the windings 33 on the end 132 side of the cross section of the coil end portion 31, the windings 33 are separated from each other, and the windings 33 are not fixed (self-fused). On the other hand, the windings 33 in the vicinity of the central portion 131 are in contact with each other through the fusion coating layer 34 and are fixed to each other by the fusion coating layer 34. Note that the winding 33 in the vicinity of the central portion 131 has adjacent windings 33 in contact with each other via the fusion coating layer 34, while the winding 33 is configured by a round wire, It is not completely buried, and a gap 133 is generated between the windings 33. That is, since the fusion coating layer 34 is made of a thin film having a thickness t of about 10 μm, a gap 133 is generated between the windings 33 even when the windings 33 are fixed by the fusion coating layer 34.

  In the present embodiment, in the coil end portion 31, the winding 33 in the vicinity of the central portion 131 of the cross section of the coil end portion 31 is pressurized and heated along the rotation axis direction (Z direction). The density in the vicinity of the central portion 131 of the cross section of the coil end portion 31 is higher than the density on the end portion 132 side of the cross section of the coil end portion 31, and the windings 33 in the vicinity of the central portion 131 are bonded to the fusion coating layer 34. It is fixed by. Specifically, in the stator coil 30 composed of a two-layer coil, the winding 33 in the vicinity of the central portion 131 has a hook shape (see FIG. 3). The stator coil 30 in a state before being pressed is, as shown in FIG. 6 described later, in the vicinity of the central portion 131 of the cross section of the coil end portion 31 and on the end portion 132 side of the cross section of the coil end portion 31. The windings 33 are separated from each other. And the coil | winding 33 near the center part 131 of the cross section of the coil end part 31 is pressurized and heated along a rotating shaft direction, As shown in FIG. 1, the center of the cross section of the coil end part 31 is shown. The density near the portion 131 is greater than the density on the end 132 side of the cross section of the coil end portion 31, and the windings 33 near the central portion 131 are fixed by the fusion coating layer 34.

  The coil end portion 31 is heated by a heater jig (not shown) or a combination of the heater jig and energization of the winding 33. Moreover, the coil end part 31 is heated by the temperature of about 150 degreeC or more and about 200 degrees C or less.

  In the present embodiment, as shown in FIG. 1, the protruding height h <b> 1 from the end portion 21 a of the stator core 21 in the vicinity of the central portion 131 of the cross section of the coil end portion 31 is the end portion 132 of the cross section of the coil end portion 31. The height h2 of the side winding 33 from the end portion 21a of the stator core 21 is substantially equal. That is, the vicinity of the central portion 131 is crushed by pressurizing the stator coil 30 formed of a saddle-like two-layered wound coil, and the protruding height h1 in the vicinity of the saddle-like central portion 131 is the end in the radial direction. The protrusion height h2 of the winding 33 on the 132 side from the end 21a of the stator core 21 is substantially equal.

  Further, as shown in FIG. 5, in this embodiment, at least the slot accommodating portion 32 is covered with an insulating paper 35. The windings 33 corresponding to the slot accommodating portions 32 of the stator coil 30, and the windings 33 and the insulating paper 35 are fixed by a fusion coating layer 34. Specifically, after the slot accommodating portion 32 is heated at a temperature of about 100 ° C. or more and less than about 150 ° C., the windings 33 and the winding 33 and the insulating paper 35 are temporarily fixed. The coil end portion 31 is heated at a temperature of about 150 ° C. or more and about 200 ° C. or less, so that the windings 33 and the winding 33 and the insulating paper 35 are firmly fixed.

(Effect of structure of this embodiment)
In the present embodiment, the following effects can be obtained.

  In the present embodiment, as shown in FIG. 1, in the state where the coil end portion 31 is assembled in the slot 23, the density in the vicinity of the central portion 131 in the cross section of the coil end portion 31 is determined. The winding 33 in the vicinity of the central portion 131 in the cross section of the coil end portion 31 is fixed by the fusion coating layer 34. Thereby, since the windings 33 in the vicinity of the central portion 131 in the cross section of the coil end portion 31 are fixed by the fusion coating layer 34, the shape of the stator coil 30 (coil end portion 31) can be maintained to some extent. At the same time, the density on the end 132 side of the cross section of the coil end portion 31 is smaller than the density in the vicinity of the central portion 131 (the spacing between the windings 33 is increased), so that heat dissipation in the coil end portion 31 of the stator coil 30 is achieved. Can be improved. That is, the heat dissipation in the coil end portion 31 can be improved while maintaining the shape of the stator coil 30 to some extent.

  In the present embodiment, as shown in FIG. 1, at least a part on the end 132 side of the cross section of the coil end portion 31 is fixed to the central portion of the cross section of the coil end portion 31 without fixing the windings 33 to each other. The windings 33 in the vicinity of 131 are fixed by the fusion coating layer 34. As a result, the windings 33 on the end 132 side of the cross section of the coil end portion 31 are not fixed to each other (the interval between the windings 33 is increased), so that the heat dissipation in the coil end portion 31 of the stator coil 30 is further improved. Can be improved.

  In the present embodiment, as shown in FIGS. 3 and 4, the stator coil 30 is formed by winding a winding 33 made of a round wire, and the slot accommodating portion 32 is formed on the outer peripheral side of the slot 23. It is composed of a two-layer overlap coil disposed on the inner peripheral side of the slot 23. As a result, even when the windings 33 made of round wires are fixed to each other by the fusion coating layer 34, a gap 133 can be formed between the windings 33 made of round wires. Can be improved effectively. Further, in the two-layer coil, the slot accommodating portion 32 of one two-layer coil is disposed on the outer peripheral side of the slot 23 in the same slot 23, and the slot accommodating portion of the other two-layer coil. 32 is arranged on the inner peripheral side of the slot 23. Thus, even if the windings 33 on the end 132 side of the cross section of the coil end portion 31 are not fixed, the coil end portion 31 of one two-layer coil and the coil end of another two-layer coil By the part 31, the coil | winding 33 of the mutual coil end part 31 can be made into the state (constrained state) collected to some extent.

  Further, in the present embodiment, as shown in FIG. 1, in the coil end portion 31, by pressing and heating the winding 33 in the vicinity of the central portion 131 of the cross section of the coil end portion 31 along the rotation axis direction, The density in the vicinity of the central portion 131 in the cross section of the coil end portion 31 is made larger than the density on the end portion 132 side in the cross section of the coil end portion 31, and at least the winding in the vicinity of the central portion 131 in the cross section of the coil end portion 31. 33 are fixed together by a fusion coating layer 34. Thereby, the fusion coating layer 34 is pressurized and heated to be cured, so that the windings 33 can be firmly fixed to each other by the fusion coating layer 34.

  In the present embodiment, as shown in FIG. 1, the protrusion height h <b> 1 from the end 132 of the stator core in the vicinity of the central portion 131 of the cross section of the coil end portion 31 is set to the end 132 side of the cross section of the coil end portion 31. The protrusion height h2 of the winding 33 from the stator core end 132 is substantially the same. Thus, unlike the case where the protrusion height h2 in the vicinity of the central portion 131 of the cross section of the coil end portion 31 is larger than the protrusion height h1 on the end portion 132 side, the stator in a state where the stator coil 30 is disposed on the stator core 21. The length in the direction of the rotation axis 20 can be reduced.

  Further, in the present embodiment, as shown in FIG. 5, the slot accommodating portion 32 is covered with the insulating paper 35, and the windings 33 corresponding to the slot accommodating portion 32 in the stator coil 30 and the winding 33 are provided. And the insulating paper 35 are fixed by the fusion coating layer 34. Thereby, it is possible to prevent the windings 33 and the windings 33 and the insulating paper 35 from being united (unbound state) in the slot 23.

(Manufacturing method of stator)
Next, a method for manufacturing the stator 20 will be described with reference to FIGS. 1, 5, and 6.

<Process for temporarily fixing windings>
As shown in FIG. 5, the winding 33 is formed by winding the coil end portion 31, the slot accommodating portion 32 accommodated in the slot 23 of the stator core 21, and the surface of the winding 33. Of the stator coil 30 provided with the coated fusion coating layer 34, at least the slot accommodating portion 32 is covered with an insulating paper 35.

  Next, the winding 33 is heated at a temperature lower than the heating temperature in the step of fixing the windings 33 to be described later by the fusion coating layer 34, thereby corresponding to the slot accommodating portion 32 of the stator coil 30. The windings 33 and the windings 33 and the insulating paper 35 are temporarily fixed by the fusion coating layer 34. Specifically, the winding 33 is heated at a temperature of 100 ° C. or higher and lower than 150 ° C., which is lower than 150 ° C. or higher and 200 ° C. or lower, which is a heating temperature in the process of fixing the windings 33 with the fusion coating layer 34. . Heating is performed by a heater jig (not shown) or a combination of a heater jig and energization of the winding 33. This step is performed before the step of fixing the windings 33 with the fusion coating layer 34. Further, in the state where the windings 33 and the winding 33 and the insulating paper 35 are temporarily fixed, the windings 33 and the winding 33 and the insulating paper 35 are not completely fixed. Thereby, when the stator coil 30 is assembled | attached to the slot 23, the coil | winding 33 becomes deformable.

<Winding assembly process>
Next, as shown in FIG. 5 and FIG. 6, the temporarily fixed stator coil 30 is assembled to the slot 23 of the stator core 21 from the inner peripheral side so that the shape of the stator coil 30 does not collapse. At this time, as shown in FIG. 6, the stator coil 30 composed of the two-layered coil has a winding 33 in the vicinity of the central portion 131 having a hook shape, and the stator core 21 of the winding 33 in the vicinity of the central portion 131. The protrusion height h0 from the end portion 21a of the coil is larger than the protrusion height h2 of the winding 33 on the end portion 132 side from the end portion 21a of the stator core 21.

<Step of fixing the windings with a fusion coating layer>
Next, as shown in FIG. 1, the winding 33 near the central portion 131 in the cross section of the coil end portion 31 is pressurized and heated along the rotation axis direction. Specifically, the coil end portion 31 is heated at a temperature of about 150 ° C. or higher and about 200 ° C. or lower. Accordingly, the density in the vicinity of the central portion 131 of the cross section of the coil end portion 31 is larger than the density on the end portion 132 side of the cross section of the coil end portion 31. Further, at least the windings 33 in the vicinity of the central portion 131 of the cross section of the coil end portion 31 are fixed by the fusion coating layer 34. Specifically, the windings 33 on the end 132 side of the cross section of the coil end portion 31 are not fixed.

  In addition, the end portion 21a of the stator core 21 in the vicinity of the central portion 131 of the coil end portion 31 is heated by pressurizing and heating the winding 33 in the vicinity of the central portion 131 in the cross section of the coil end portion 31 along the rotation axis direction. The protrusion height h1 from the coil end portion 31 is substantially equal to the protrusion height h2 from the end portion 21a of the stator core 21 of the winding 33 on the end 132 side of the cross section of the coil end portion 31.

  Further, by pressing and heating the winding 33 in the vicinity of the central portion 131 in the cross section of the coil end portion 31 along the rotation axis direction, the windings 33 corresponding to the slot accommodating portion 32 in the stator coil 30 are mutually connected. Further, the winding 33 and the insulating paper 35 are temporarily fixed by the fusion coating layer 34 to be firmly fixed by the fusion coating layer 34.

(Effect of the manufacturing method of this embodiment)
In the present embodiment, the following effects can be obtained.

  In the present embodiment, as shown in FIG. 1, the step of fixing the windings 33 to each other with the fusion coating layer 34 is performed along the rotation axis direction of the windings 33 in the vicinity of the central part 131 of the cross section of the coil end part 31. By applying pressure and heating, the protrusion height h1 from the end 21a of the stator core 21 in the vicinity of the central portion 131 of the cross section of the coil end portion 31 is set to the winding 33 on the end 132 side of the cross section of the coil end portion 31. A step of making the protrusion height h2 of the end portion 21a of the stator core 21 substantially equal. Thereby, the protrusion height h1 in the vicinity of the central portion 131 in the cross section of the coil end portion 31 and the protrusion height h1 on the end portion 132 side are aligned, and the windings 33 are firmly fixed by the fusion coating layer 34. Can be done in one step.

  Further, in the present embodiment, as shown in FIG. 5, the slot accommodating portion 32 is covered with the insulating paper 35, and the windings 33 are arranged before the step of assembling the stator coil 30 to the slot 23 of the stator core 21. Is heated at a temperature lower than the heating temperature in the step of fixing the wire with the fusion coating layer 34, the windings 33 corresponding to the slot accommodating portions 32 in the stator coil 30, and the windings 33 and a step of temporarily fixing the insulating paper 35 with the fusion coating layer 34. Thus, when the stator coil 30 is assembled in the slot 23 of the stator core 21, the windings 33 and the winding 33 and the insulating paper 35 are temporarily fixed. Therefore, the stator coil 30 is inserted into the slot 23 of the stator core 21. Can be assembled smoothly.

[Modification]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said embodiment, although the fusion | melting coating layer showed the example which consists of a polyimide-type or a polyamide-type resin, this invention is not limited to this. For example, the fusion coating layer may be made of a resin other than a polyimide or polyamide resin.

  Moreover, in the said embodiment, although the example in which substantially all the windings by the side of the edge part of the cross section of a coil end part were not fixed was shown, this invention is not limited to this. For example, the windings may be fixed in a part of the end portion side of the cross section of the coil end portion.

  Moreover, in the said embodiment, although the stator coil consisted of a round wire and the example which consists of a two-layered lap coil was shown, this invention is not limited to this. For example, the stator coil may be composed of a conductor other than a round wire (such as a flat conductor), or may be composed of a coil other than a two-layer coil (such as a single-layer coil).

  In the above embodiment, the windings near the center of the cross section of the coil end portion are pressed and heated along the rotation axis direction, so that the windings are fixed by the fusion coating layer. Although an example is shown, the present invention is not limited to this. In the present invention, the windings may be fixed by the fusion coating layer by a method other than pressurization and heating.

  Moreover, in the said embodiment, the protrusion height from the edge part of the stator core near the center part of the cross section of a coil end part is the protrusion height from the edge part of the stator core of the coil | winding of the edge part side of the cross section of a coil end part. Although the example which becomes substantially equal was shown, this invention is not limited to this. For example, the protruding height in the vicinity of the center portion of the cross section of the coil end portion may be larger (or smaller) than the protruding height of the winding on the end portion side of the cross section of the coil end portion.

  In the above embodiment, an example in which the slot accommodating portion is covered with insulating paper has been described, but the present invention is not limited to this. In the present invention, the entire stator coil may be covered with insulating paper. Further, the slot accommodating portion may be covered with an insulating member other than insulating paper.

20 Stator 21 Stator core (stator core body)
21a (stator core) end portion 23 slot 30 stator coil 31 coil end portion 32 slot accommodating portion 33 winding 34 fusion coating layer 35 insulating paper (insulating member)
131 Central portion (in cross section of coil end portion) 132 End portion (in cross section of coil end portion) h1, h2 Projection height

Claims (10)

A stator coil that is assembled to a stator core and formed by winding a winding,
A coil end portion, a slot accommodating portion accommodated in a slot of the stator core, and a fusion coating layer coated on the surface of the winding,
The coil end portion is
In the state where the stator coil is assembled in the slot, the density in the vicinity of the central portion of the cross section of the coil end portion is larger than the density on the end side of the cross section of the coil end portion,
At least the windings in the vicinity of the central portion of the cross section of the coil end portion are fixed by the fusion coating layer.   The windings are not fixed to at least a part of the end side of the cross section of the coil end part, and the windings near the center part of the cross section of the coil end part are formed by the fusion coating layer. The stator coil according to claim 1, which is fixed.   The stator coil is formed by winding the winding made of a round wire, and the slot accommodating portion is disposed on the outer peripheral side of the slot and the inner peripheral side of the slot. The stator coil according to claim 1, comprising a lap coil.   In the coil end portion, the winding in the vicinity of the central portion of the cross section of the coil end portion is pressurized and heated along the direction of the rotation axis, whereby the density in the vicinity of the central portion of the cross section of the coil end portion is increased. Is larger than the density on the end side of the cross section of the coil end portion, and at least the windings in the vicinity of the central portion of the cross section of the coil end portion are fixed by the fusion coating layer, The stator coil according to claim 1.   The protruding height from the end of the stator core near the center of the cross section of the coil end portion is substantially equal to the protruding height from the end of the stator core of the winding on the end side of the cross section of the coil end portion. The stator coil according to claim 1, wherein the stator coil is configured to be. At least the slot accommodating portion is covered with an insulating member,
The said windings corresponding to the said slot accommodating part of the said stator coils, and the said coil | winding and the said insulation member are any one of the Claims 1-5 fixed by the said fusion | melting coating layer. The stator coil according to item. A stator core body,
A stator coil that is assembled to the stator core body and formed by winding a winding;
The stator coil includes a coil end portion, a slot accommodating portion accommodated in a slot of the stator core, and a fusion coating layer coated on the surface of the winding.
The coil end portion is
In the state where the stator coil is assembled in the slot, the density in the vicinity of the central portion of the cross section of the coil end portion is larger than the density on the end side of the cross section of the coil end portion,
At least the windings in the vicinity of the central portion of the cross-section of the coil end portion are fixed by the fusion coating layer. A stator that is formed by winding a winding, and that includes a coil end portion, a slot accommodating portion that is accommodated in a slot of the stator core, and a fusion coating layer that is coated on the surface of the winding. Assembling a coil in the slot of the stator core;
By pressing and heating the winding near the center of the cross section of the coil end portion along the rotation axis direction, the density near the center of the cross section of the coil end portion is reduced to the cross section of the coil end portion. And a step of fixing at least the windings in the vicinity of the central portion of the cross section of the coil end portion with the fusion coating layer.   The step of fixing the windings with the fusion coating layer includes pressing the windings in the vicinity of the center of the cross section of the coil end portion along the direction of the rotation axis and heating the coil end portion. Including the step of making the protruding height from the end of the stator core near the center of the cross section substantially equal to the protruding height from the end of the stator core of the winding on the end side of the cross section of the coil end portion, The method for manufacturing a stator according to claim 8. At least the slot accommodating portion is covered with an insulating member,
Before the step of assembling the stator coil in the slot of the stator core, by heating the winding at a temperature lower than the heating temperature in the step of fixing the windings with the fusion coating layer, 10. The method according to claim 8, further comprising a step of temporarily fixing the windings corresponding to the slot housing portion of the stator coil and the windings and the insulating member with the fusion coating layer. Method for manufacturing a stator.

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