JPS6310658B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a stator for a rotating electrical machine such as an electric motor, and more particularly to a method for manufacturing a stator using U-shaped wedges connected in an annular manner. It is something.

[Prior art]

FIG. 1 is a diagram showing an electric motor manufactured by a conventional method, in which 1 indicates a frame, 2
is a bracket that abuts on this frame 1, 3 is a bearing provided on the frame 1 and bracket 2, respectively, 4 is a rotor shaft whose both ends are supported by these bearings 3, and 5 is a rotor shaft that straddles the frame 1 and bracket 2. 6 is the stator core, 6a is its slot, 7 is the slot 6
an insulating paper 8; a coil insulated by the insulating paper 7 and housed in the slot 6a; 9 a wedge for fixing each coil 8 in the housed state; 10;
indicates the rotor.

As mentioned above, in the conventional method, one wedge 9 is used for each slot 6a, which has the disadvantage that not only cutting and shaping the wedge but also inserting the wedge requires a lot of effort.

In addition, since a strip-shaped wedge is individually inserted into each slot, the ends of the stator protruding from the stator core are bent and deformed during drying of the stator, causing trouble when the rotor hits the stator during assembly.

In order to eliminate such drawbacks, one end of a plurality of strip-shaped slot wedges made of an insulating material is provided with a band integral with the slot wedges, as in, for example, Japanese Utility Model Publication No. 27-5741 ``Stators for Electrical Machines''. It is known to press wedges connected together into a comb shape into a slot.

[Problem that the invention seeks to solve]

However, in the conventional example described above, the wedges are simply prevented from deforming by connecting a plurality of slot wedges to form a comb shape. The disadvantage is that it cannot be prevented.

In the present invention, in order to improve this drawback, the end of the U-shaped unit wedge opposite to the end inserted into the slot,
That is, an extension part is provided for connecting the opposite end to the insertion part in an annular manner, and this extension part is selected to have a length sufficient to prevent the coil end from falling inward in a predetermined state of being assembled into the stator. As a result, the coil end can be prevented from collapsing.

[Means for solving problems]

U-shaped unit wedges each having an inclined part formed at the insertion end, and an extension part for connecting the anti-insertion ends of these U-shaped unit wedges in an annular manner,
The length of the U-shaped unit wedge in the axial direction is longer than the laminated length of the iron core, and is selected to be the same as or slightly longer than the length of the insulating paper in the slot, and the extension part is selected to have a predetermined length to the stator. Annularly connected U-shaped unit wedges are used which are selected to have a length sufficient to prevent the coil ends from falling inward in the assembled state.

[Effect]

After inserting the coil into each slot, the coil end on the insertion side is slightly expanded outward,
Each of the U-shaped unit wedges is inserted into the slot with the inclined tip end of the wedge first, and after the insertion is completed, the wedge is continuously extended so that the coil end on the insertion side in the expanded state returns to its original state. to shape the coil end into a predetermined shape.

〔Example〕

FIG. 2 shows a cross-sectional view of an electric motor manufactured by the method of the present invention, in which the same parts as those in FIG. 1 are designated by the same reference numerals. The difference is that the U-shaped unit wedges 11a inserted every 6a are formed so as to be connected in series in an annular manner by an extension portion 11b.

3 and 4 show specific examples of this wedge 11, in which the wedge 11 is inserted into each slot 6a.
unit wedge 1 for fixing the coil 8 inserted in
1a and an extension portion 11b and each slot 6 for serially connecting the anti-insertion end of each of these unit wedges.
Each unit wedge has a sloped portion 11c formed at the insertion end to facilitate insertion into the wedge, and the entire unit wedge has an annular shape as shown in the figure.
The length of each unit wedge 11a in the axial direction is longer than the laminated thickness of the iron core 6, and is selected to be equal to or slightly longer than the length of the insulating paper 7 in the slot 6a, and its extended portion 11b is selected as shown in FIG. As shown by A, the length is selected to be sufficient to prevent the coil end 8a from falling inward when the coil end 8a is assembled into the stator 5 in a predetermined state.

The wedge 11 is made of an injection molded body of glass fiber-reinforced polybutyl terephthalate resin, glass fiber-reinforced nylon resin, or the like.

To insert the wedge 11 having the above structure into the slot 6a manually, for example, after inserting the coil 8 into each slot 6a, the coil end 8a on the insertion side is slightly expanded outward, and each inclined end portion of the wedge 11 is inserted into the slot 6a. Insert each unit wedge into the slot 6a with the wedge 11c first, and after the insertion is completed, press it against the protruding extension 11b of the wedge 11 so that the inserted coil end 8a in the expanded state returns to its original position. The coil end of the section is shaped into a predetermined shape.

5 and 6 show other embodiments of the stator wedge of the present invention, in which the unit wedges 11a are not arranged in a complete annular shape but as required as shown in the figure. Number unit wedge 11
The extension part 11b connecting the group a is connected to the connecting ring 1 at the center.
1e and a radial connecting arm 11d are used to form a continuous ring shape.

〔Effect of the invention〕

As described above, the present invention can (i) prevent the coil ends of the coils housed in each slot of the stator from falling inward, thereby preventing interference with the rotation of the rotor; and (ii) Since the U-shaped unit wedge has a sloped portion at its insertion end, the insertion process can be carried out smoothly and quickly when inserting the unit wedge into the slot after inserting the coil into each slot. As a result, a rotating machine with excellent performance can be manufactured quickly.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional front view of a motor manufactured by a conventional method, and FIG. 2 is a partial cross-section of a similar electric motor having a stator manufactured by the method of the present invention. Front view shown, Figures 3 and 4
The figure shows a wedge used in the stator of the present invention,
FIG. 3 is a partially cutaway front view of the same, and FIG. 4 is a plan view of the same as shown in FIG. 5 and 6 are similar views showing other wedges used in the present invention. In the figure, 6 shows the stator core, 6a its slot, 8a the coil end, 11a the unit wedges inserted into each of the slots, and 11b the extension of each of these unit wedges. In other figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a method of manufacturing a stator for a rotating electric machine, which includes a stator core having a plurality of slots, a coil housed in the slot of the stator core, and a plurality of wedges that respectively hold the coils in the slots, U-shaped unit wedges each having an inclined part formed at an end, and an extension part for annularly connecting the anti-insertion ends of these U-shaped unit wedges, the length of the U-shaped unit wedge in the axial direction The length is longer than the stacked length of the iron core, and the length of the insulating paper in the slot is selected to be equal to or slightly longer than this. Using an annularly connected U-shaped unit wedge selected to have a length sufficient to prevent it from falling over, first insert the coil into each slot and then slightly expand the coil end on the insertion side outward. Insert each of the unit wedges into the slot with the inclined tip end of the wedge first, and after the insertion is completed, connect and extend the wedge so that the coil end on the insertion side in the expanded state returns to its original state. 1. A method of manufacturing a stator for a rotating electric machine, comprising shaping the coil end into a predetermined shape by pressing the coil end against the coil end.