JP2014158316A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine having stronger fastening force and high reliability by preventing runoff of a resin and increasing a contact area between the stored resin and a wedge.SOLUTION: Disclosed is a stator of a rotary electric machine in which a slot 6 is formed on the inner peripheral surface of an iron core 2 formed in a cylindrical shape along the axial direction, an engaging groove 7 is formed on both inner walls of an open groove of this slot 6, and a wedge 9 covering the open groove part of the slot 6 is equipped in the engaging groove 7 in a state where both end sides are fitted to each other and to which resin impregnation treatment is applied. In the inside of the engaging groove 7, a recess 7A is formed which inclined at a predetermined angle with respect to the width direction of the wedge 9 engaged with this engaging groove 7. In the wedge 9, a projection 9A is formed which is inclined in a shape capable of being inserted into the recess 7A in a state of being engaged with the engaging groove 7.

Description

  Embodiments of the present invention relate to a stator for a rotating electrical machine having an improved structure for attaching a coil fixing wedge to a wedge groove of a coil slot provided in an iron core.

  A stator of a rotating electric machine such as an electric motor or a generator has a cylindrical stator core. The stator core is formed in a cylindrical shape as a whole while laminating silicon steel plates and interposing a spacer for each predetermined thickness to form a radial ventilation duct. In addition, a plurality of coil slots along the axial direction are formed on the inner peripheral surface of the stator core (the surface facing the outer periphery of the rotor) at predetermined intervals along the entire circumference. This slot accommodates the stator coil, and the groove portion on the inner peripheral surface of the stator core is covered with a coil fixing wedge. That is, a wedge groove is formed along the length direction of the slot on both inner side walls of the open groove portion of the slot, and the wedge for fixing the coil is in a state in which both sides thereof are engaged in the wedge groove. Cover the open groove of the slot. The wedge covers the open groove portion of the slot, and fixes the coil accommodated in the slot through the spacer on the back surface.

  In manufacturing such a stator, after the stator coil is accommodated in the slot, the coil fixing wedge is formed in the slot opening groove portion while adjusting the thickness of the spacer, and the shaft is inserted into the wedge groove. Insert from the end of the direction. In such a configuration, the joint portion of the wedge groove of the slot and the wedge for fixing the coil is expected to be in surface contact with each other. .

  Thereafter, in order to impregnate the stator including the assembled slot portion with the resin, the stator is vacuum impregnated in the impregnation tank and then pulled up from the impregnation tank. After the pulling up, the resin remaining on the stator is dried and solidified to increase the fixing force between the wedge groove and the coil fixing wedge.

  However, since the joint portion between the slot groove wedge and the coil fixing wedge is in a line contact state, a gap is formed in this portion. Since the resin used for impregnation is not high in viscosity, immediately after the stator is pulled up from the impregnation tank, the resin flows out through a gap formed between the wedge groove and the coil fixing wedge or through the ventilation duct. For this reason, the resin may not remain sufficiently between the slot and the coil fixing wedge after drying and solidification. In particular, at the lower slot on the inner circumference (circumference) of the stator, the resin tends to flow down before drying in the drying step after impregnation, and the fixing force is weakened.

  In this way, it is inevitable that a gap is generated in terms of work, but if the impregnated resin remains, a binding force on the wedge equivalent to the surface contact expected at the beginning can be expected. Therefore, a structure that prevents the resin in the gap from being removed is desired.

  As a technique for solving this problem, it is conceivable to form a recess in the wedge groove, leave the resin in the recess by surface tension, and bring the remaining resin into contact with the side end of the coil fixing wedge. (For example, see Patent Document 1).

JP 2003-79087 A

  In the above configuration, since the recess is formed, the resin remains in the recess due to the surface tension of the resin. However, since the distance between the inner surface and the side edge of the wedge becomes longer due to the formation of the recess, a sufficient contact area between the remaining resin and the side edge of the wedge cannot be obtained, and a strong solid state is obtained. It was difficult to get the power.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a stator of a rotating electrical machine that has a stronger fixing force and higher reliability by preventing the resin from being lost and increasing the contact area between the accumulated resin and the wedge.

  In the stator of the rotating electrical machine according to the embodiment of the present invention, a coil slot is formed along the axial direction on the inner peripheral surface of the cylindrical iron core, and the slot is formed on the inner peripheral surface of the iron core. Engaging grooves are formed on both inner side walls of the open groove portion along the length direction of the slot, and the coil is fixed to cover the open groove portion of the slot with both sides engaged in the engage groove. A stator of a rotating electrical machine that is subjected to a resin impregnation treatment, and the inside of the engagement groove is inclined at a predetermined angle with respect to the width direction of the wedge engaged with the engagement groove. A recess is formed along the length direction of the engagement groove, and the both sides of the wedge are protrusions inclined to a shape that can be inserted into the recess while being engaged with the engagement groove. Is formed along the length direction of the wedge.

  According to the present invention, the wedge can be firmly bonded via the resin by preventing the resin from being lost and increasing the contact portion between the wedge and the resin.

It is sectional drawing which shows the slot part of the stator of the rotary electric machine which concerns on one embodiment of this invention. It is a principal part enlarged view of FIG. FIG. 3 is an enlarged view of a wedge groove shown in FIG. 2. FIG. 3 is an enlarged view of a main part of the coil fixing wedge shown in FIG. 2. It is a principal part enlarged view of the slot part of the stator of the rotary electric machine which concerns on other embodiment of this invention. It is a figure which shows the basic structure of the stator of the rotary electric machine which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the basic structure of the stator 1 of the rotating electrical machine will be described with reference to FIG.

  In FIG. 6, the stator 1 has an iron core 2 having a cylindrical shape. The stator core 2 is formed in a cylindrical shape as a whole by laminating annular silicon steel plates, and a radial ventilation duct 3 is formed with a spacer (not shown) interposed for each predetermined thickness. And it fixes integrally with the stud volt | bolt 5 via the stator presser plate 4 of both sides.

  On the inner peripheral surface (upper surface in FIG. 6) of the stator iron core, a plurality of coil slots 6 are formed along the axial direction at predetermined intervals along the entire circumference. As shown in FIG. 1, the slot 6 accommodates the stator coil 8, and the groove portion on the inner peripheral surface (upper surface in the drawing) of the stator core 2 is covered with a coil fixing wedge 9. ing. That is, an engagement groove (wedge groove) 7 is formed along the length direction of the slot 6 on both inner side walls of the open groove portion (the upper part in the figure) of the slot 6, and the wedge 9 for fixing the coil is The open groove portion of the slot 6 is covered with both side portions engaged in the engagement groove 7. The wedge 9 covers the open groove portion of the slot 6 and fixes the coil 8 accommodated in the slot 6 through the spacer 10 by the back surface thereof. As a material of the wedge 9 for fixing the coil, a polyester glass mat laminate, an epoxy iron powder glass mat, or the like is employed.

  Here, as shown in FIGS. 2 and 3, a recess 7A-1 is formed in the above-described engagement groove (hereinafter, described as a wedge groove) 7 (left / right end in the drawing). The recess 7A-1 is inclined at a predetermined angle with respect to the width direction (horizontal direction in the drawing) of the wedge 9 engaged with the wedge groove 7. The recess 7A-1 is formed along the length direction of the wedge groove 7. The inclination direction of the recess 7A-1 is an inclination direction toward the outer periphery (downward in the drawing) of the iron core 2. By forming the inclined portion 7A-1 inclined in this way, as shown in FIG. 3, a relatively protruding portion 7A-2 is formed at the root portion.

  Further, both side portions of the wedge 9 are inserted into and engaged with the wedge groove 7 as described above, and the tip portions (left / right ends) of the both side portions are as shown in FIG. 2 and FIG. Protrusion 9A-1 is provided. As shown in FIG. 4, the projection 9A-1 can be inserted into the recess 7A-1 with both sides of the wedge 9 engaged with the wedge groove 7, as shown in FIG. The concave portion 7A-1 is formed so as to be inclined in the same direction as that of the concave portion 7A-1. The protrusion 9A-1 is also formed along the length direction of the wedge 9. In addition, by forming the inclined protrusion 9A-1 in this way, a recess 9A-2 is relatively formed at the root portion.

  The coil fixing wedge 9 is inserted into the wedge groove 7 formed in this way from the axial direction so that the convex portion 9A-1 of the coil fixing wedge 9 enters the concave portion 7A-1 of the wedge groove 7A. To fix.

  Next, the stator 1 formed as described above is impregnated with resin in an impregnation tank (not shown), and after being drawn up, dried and solidified. When the up-and-down direction of the slot 6 at the time of lifting is the same direction as in FIG. 1 or 90 degrees from that, the resin accumulates in the recess 7A-1 of the wedge groove 7 when the stator 1 is lifted, Loss can be prevented. Further, since the convex portion 9A-1 of the coil fixing wedge 9 enters the concave portion 7A-1 of the wedge groove 7, the resin accumulated in 7A-1 and the convex portion of the coil fixing wedge 9 have a wide contact. Drying and solidifying in contact with the area, the coil fixing wedge 9 and the iron core 1 are firmly fixed.

  When the up-and-down direction of the slot 6 at the time of lifting is opposite to that in FIG. 1, the resin accumulates in the concave portion 9A-2 formed at the base of the convex portion 9A-1 of the coil fixing wedge 9 to prevent the resin from flowing out. Can do. Further, since the convex portion 7A-2 formed at the base of the concave portion 7A-1 of the wedge groove 7 enters the resin reservoir, it is dried and solidified with a wide contact area, and the gap between the coil fixing wedge 9 and the iron core 1 is obtained. Fix firmly.

  As described above, according to the present embodiment, the concave portion 7A-1 is provided in the wedge groove 7 and the convex portion 9A-1 is provided in the coil fixing wedge 9, thereby forming a resin reservoir when the resin is impregnated. In addition to preventing the loss, the contact area between the resin reservoir, the wedge groove 7 and the coil fixing wedge 9 can be increased. That is, when the wedge 9 is inserted into the wedge groove 7, the tip of the projection 9A-1 of the wedge 9 enters inside the wedge groove 7 from the entrance plane of the recess 7A-1, so the tip of the projection 9A-1 Enters the resin stored in the recess 7A-1, so that it can be securely fixed. As a result, it is possible to obtain a higher fixing force than before and prevent the coil fixing wedge 9 from dropping from the wedge groove 7.

  Next, the embodiment shown in FIG. 5 will be described. The difference between this embodiment and the above-mentioned embodiment is that the inclination directions of the concave portion 7A-1 of the wedge groove 7 and the convex portion 9A-1 of the coil fixing wedge 9 are changed. That is, in the present embodiment, the inclination direction of the concave portion 7A-1 of the wedge groove 7 and the convex portion 9A-1 of the coil fixing wedge 9 is inclined toward the inner peripheral (upward direction) of the iron core 2. It is.

  In the present embodiment, when the resin is pulled up from the impregnation tank, the resin accumulates in the concave portion 9A-2 formed at the base of the convex portion 9A-1 of the coil fixing wedge to prevent the resin from flowing out. Further, since the convex portion 7A-2 formed at the base of the concave portion 7A-1 of the wedge groove 7 enters the resin reservoir, it is dried and solidified with a wide contact area, and the gap between the coil fixing wedge 9 and the iron core 1 is obtained. Fix firmly.

  Further, when the up-down direction of the slot 6 at the time of lifting is opposite to that shown in FIG. 5 or rotated 90 degrees therefrom, the resin is accumulated in the concave portion 7A-1 of the wedge groove 7 to prevent the resin from flowing out. Also, since the convex portion 9A-1 enters the coil fixing wedge 9 into the resin pool, it is dried and solidified with a wide contact area, and the coil fixing wedge 9 and the iron core 1 are firmly fixed.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Stator 2 ... Iron core 6 ... Slot 7 ... Engagement groove (wedge groove)
7A-1 ... concave part 8 ... coil 9 ... wedge 9A-1 ... convex part

Claims (3)

A slot for the coil is formed along the axial direction on the inner peripheral surface of the cylindrical iron core, and the length direction of the slot is formed on both inner side walls of the slot of the slot to the inner peripheral surface of the core. Of the rotating electrical machine that is provided with a coil fixing wedge that covers the open groove portion of the slot with both sides engaged in the engagement groove, and is subjected to resin impregnation treatment. A stator,
A recess that is inclined at a predetermined angle with respect to the width direction of the wedge engaged with the engagement groove is formed in the engagement groove along the length direction of the engagement groove.
Protruding portions that are inclined in a shape that can be inserted into the recesses while being engaged with the engagement grooves are formed along the length direction of the wedges on both side portions of the wedge. The stator of a rotating electrical machine.   2. The stator for a rotating electrical machine according to claim 1, wherein a recess formed in the engagement groove is inclined toward an outer peripheral direction of the iron core.   2. The stator for a rotating electrical machine according to claim 1, wherein a recess formed in the engagement groove is inclined toward an inner circumferential direction of the iron core.

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