JPH05137287A - Assembling method for stator coil - Google Patents

Abstract

PURPOSE:To realize a method for assembling a stator coil in which a back surface of the coil is not strongly pressed to a corner of a bottom of a slot of a core end at the time of assembling the end of the coil. CONSTITUTION:A method for assembling a stator coil has a stator coil 8 assembled in a slot 1a of a stator core 1, an outer spacer 2 of a back opposed to the back of the coil out of the slot, and a binding member 7 for binding the end of the coil 8 by a binding ring 6. At the time of binding with the member 7, a protective member 11 in which the opposed parts of the coil at the axial outside are rounded is interposed between the back of the coil out of the slot and the outer spacer 2 of the back.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a stator coil of a rotary electric machine.

[0002]

2. Description of the Related Art A stator coil end portion of a large-capacity rotating electric machine such as a turbine generator is firmly fixed to counter an electromagnetic force. FIG. 5 shows an assembly view of a stator coil end portion of a conventional turbine generator. The back of the slot (1a) at the end of the stator core (1) is provided with a back outer spacing piece (2), an outer spacing piece (not shown) extending to both sides of the slot, and a holding plate (3). Further, a shield plate (4) for shielding the leakage magnetic flux at the end of the iron core is fixed to the holding plate (3). Further, a bind ring support (5) is attached to the shield plate (4), and a stator coil (8) is attached to the bind ring (6) fixed to the bind ring support (5) by the bind member (7). It is tightly bound and fixed through an insulator (9) to prevent vibration of the stator coil end portion due to electromagnetic force. In the end assembly work of the stator coil (8), the insulator (9) is also interposed between the upper coil (8a) and the lower coil (8b), and the binding member (7) is generally made of glass fiber containing resin. It is tied up with a rope and cured by heating.

[0003]

During the above-mentioned binding and fixing work, the stator coil (8) is pressed against the bind ring support (5), and as a result, the lower coil (8b) (or single layer winding if Since it is a stator coil, it will be referred to as a stator coil hereinafter) is also strongly pressed against the bottom of the stator core slot, and at this time, the stator coil (8) is insulated at the bottom corner (1b) of the core end slot. There was a risk of damage. For this reason, it is necessary to avoid the stator coil (8) from being strongly pressed against the bottom corner portion (1b) of the iron core end slot during the assembly work of the stator coil end portion, and to avoid the insulation damage of the stator coil (8). is there.

It is an object of the present invention to provide an assembling method that prevents the back portion of the stator coil from being strongly pressed against the bottom corner portion of the core end slot during the stator coil end assembly work.

[0005]

In order to achieve the above object, according to the present invention, a stator coil incorporated in a slot of a stator core and a back outer spacing piece opposed to the back of the stator coil outside the slot. And a binding member for binding the ends of the stator coil to the binding ring, in a method of assembling the stator coil, in the axial direction between the back portion of the stator coil outside the slot and the back outer spacing piece when binding the binding member. A protection member having a rolled outer coil facing portion is interposed.

[0006]

With this arrangement, when the stator coil end is assembled and the stator coil is fastened to the bind ring,
The back portion of the stator coil is pressed against the protection member and is not pressed strongly against the bottom corner portion of the iron core end slot, the insulation of the stator coil is not damaged, and the reliability of the stator coil is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an assembly diagram of an embodiment of the present invention. The same parts as those in FIG. In FIG. 1, the difference from the conventional FIG. 5 is that there is a jig (10) between the back part of the stator coil (8) outside the slot and the back outer space piece (2), which is adjustable in space. That is, a protection member (11) formed by rounding the coil facing portion on the axially outer side is interposed. 1 to 4
The shaded part of the protective member (11) in FIG. 1 is for distinction from other members and is not a cross-sectional display.

FIG. 2 is an enlarged side view of the stator core end portion near the slot, and FIGS. 3 and 4 are a back outer spacing piece (2) and a stator coil for facilitating attachment and detachment of the protective member (11). The structure of the apparatus which attached the protection member (11) to the jig (10) which can be adjusted according to the space | interval with (8) is shown. As the protective member (11), a wooden one is used, and as shown in FIGS. 3 and 4, a radius R is provided at the corner of the protective member at the coil facing portion on the axially outer side.
Is provided with a rounded portion (11a). Each part of the adjusting jig (10) is made of iron, and the protective member (11) is integrated with the upper movable part (12) by an adhesive or screwing (not shown). The contact surfaces of the lower movable part (13) and the adjusting part (14) of the upper movable part (12) are both provided with the same angle, and the adjusting part (14) has a tapered structure according to the angle.
In addition, as shown in FIG. 4, the lower movable part (1
3) is provided on the contact surface side between the upper movable part (12) and the dovetail-shaped convex part (15a) whose width becomes narrower toward the root, and the lower movable part (13) and the upper movable part (12) are matched accordingly. ) Is provided with a dovetail groove-shaped recess (14a) (shown in FIG. 3) on the contact surface with the plate portion (15), and the protective member (1
1) A structure in which the lower movable part (13) and the upper movable part (12) slide on the plate part (15) only in two directions of the back outer spacing piece (2) direction and the stator coil (8) direction at the time of installation work. And In addition, the plate (15) has bolts (1
6) is attached, and the adjusting nut (17) is attached to the adjusting portion (14). This adjustment nut (17) is used to adjust the adjustment jig (10).
By tightening 7), the length of the adjustment jig (10) in the height direction becomes longer. In FIG. 4, (8a) is the boundary of the insulating tape of the stator coil (8).

The protective member (11) provided with the adjusting jig (10) is attached to the back outer spacing piece (2) of each slot (1a) and the stator before the stator coil (8) end assembly work. Insert the protective member (11) between the backs of the coils (8) such that the protection member (11) contacts the back of the stator coil (8), and adjust the nut (1).
Fix by adjusting 7). Due to this protective member (11), the stator coil (8) has a back portion at the stator core end slot bottom corner portion (1b) during the assembly of the stator coil.
The protective member (1
Since the pressing force is gradually released at the rounded portion (11a) having the radius R of 1), the coil insulation will not be damaged. After the assembly work is completed, the adjusting jig (10) and the protective member (11) can be easily removed by loosening the adjusting nut (17).

In the above embodiment, the stator coil (8) is prevented from being damaged by the contact with the stator core end slot bottom corner (1b) at the back of the stator coil (8) during the coil end assembly work. The reliability can be improved. Further, by using the adjusting jig (10) which can be adjusted by the adjusting nut (17), the protection member (11)
Insertion and removal work can be facilitated. Further, since the adjusting jig (10) and the protective member (11) can be used in many machines, the productivity is also improved.

[0011]

As described above, according to the present invention, when the stator coil end is assembled, the protective member is inserted between the back outer space piece and the stator coil back, whereby the coil end is bound. Prevents damage to the insulation at the back of the stator coil due to being strongly pressed against the bottom corners of the stator core end slot when it is pressed strongly against the support, and the protection member can be used across multiple machines. Productivity can be improved.

[Brief description of drawings]

FIG. 1 is an assembly diagram showing the periphery of a coil end portion according to an embodiment of the present invention.

FIG. 2 is an enlarged side view showing the vicinity of the slot in FIG.

FIG. 3 is an enlarged assembly view showing the periphery of the protection member of FIG.

FIG. 4 is an enlarged perspective view of a main part of FIG.

FIG. 5 is an assembly view showing the periphery of a conventional coil end portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Stator iron core 1a ... Slot 1b ... Slot bottom corner part 2 ... Back outer space | interval piece 6 ... Bind ring 7 ... Bind member 8 ... Stator coil 11 ... Protective member

Claims (1)

[Claims] 1. A stator coil assembled in a slot of a stator core, a back outer spacing piece facing the back of the stator coil outside the slot, and a binding member for binding the end of the stator coil to a bind ring. In the method for assembling the stator coil, the protective member, which is formed by rolling the axially outer coil facing portion, is interposed between the back portion of the slot outer stator coil and the back outer spacing piece when binding the binding members. Method for assembling the stator coil.