JPS62185526A - Stator coil - Google Patents

Abstract

PURPOSE:To simplify a winding work, to improve the insulation and to prevent a coil from deforming or displacing by setting the flatness degree of a magnet wire to a predetermined range, winding it in one row, and so forming a flat surface including a U-shaped portion formed on a coil end as to incline the surface at a predetermined angle. CONSTITUTION:A flat magnet wire 22 used to form a coil 21 is made of a flat enameled wire having 5-20 of flatness degree, the wire 22 is wound in one row to be formed in a hexagonal shape to form a coil 21. A U-shaped portion 24 is formed at the central portion of the end 23 of the coil 21. In this case, the flat surface 25 including the portion 24 is so formed as to incline at an angle theta2 of 15-45 deg. with respect to a flat surface 27 for coupling the center 26 of the portion 24 with the central axis 11 of a stator 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a stator coil formed by winding rectangular magnet wire and forming it into a hexagonal shape.

[Technical Background of the Invention] As shown in FIGS. 3 to 5, for example, a conventional stator coil is made by winding a rectangular enameled wire 1, which is a rectangular magnet wire, in a plurality of rows, for example, two rows. A coil 3 with an interlayer insulator 2 interposed therebetween is formed into a hexagonal shape, and a U-shaped portion 5 is formed in the center of the coil end portion 4.

Then, the straight portion 6 of this coil 3 is inserted into the slot 7a of the stator core 7 to form the stator 8.

In this case, as shown in FIG. 4, the plane 9 including the U-shaped portion 5 forms an angle of Oo to 15° with respect to the plane 12 connecting the center 10 of the U-shaped portion 5 and the central axis 11 of the stator 8. It was tilted at θ1.

[Problems in the Background Art] However, in the double-row coil 3 as in the conventional configuration described in 1., it is necessary to perform the winding work without interposing the interlayer insulator 2 between each row. The work is complex, making it extremely difficult to automate, and has the disadvantage of high costs.

Moreover, when impregnating and curing the coil 3 with insulating varnish,
Since it is difficult for the insulating varnish to penetrate into the small gaps between each row of the coils 3 and the interlayer insulator 2, voids are likely to be formed in these areas, resulting in deterioration of insulation properties due to void discharge.

The above drawbacks could be overcome by winding rectangular enamelled wire in a single row and omitting the interlayer insulator. However, in order to obtain the same cross-sectional area and number of windings as a two-row coil when winding a two-row coil, the width of the rectangular enamelled wire must be twice that of the two-row coil. There are circumstances. Under such circumstances, if a rectangular enameled wire is simply wound in one row and formed into the same shape as before, when the wound coil is formed into a tortoise-shell shape, both ends of the U-shaped part (the third In the figure, reference numeral 5a.

Since the bending stress acting on the portion 5b) becomes extremely large, problems arise such as an increase in the deviation between the wound layers of the enameled wire and cracks in the enamel coating, resulting in a decrease in insulation properties. The reason for this is that in the conventional coil shape, the U-shaped portion of the coil end portion 4 has an inclination angle of θ1 to 15°, as shown in FIG. This is because the coil end portion is largely twisted relative to the other coil end portions.

Therefore, in the past, from the viewpoint of preventing deformation and displacement and ensuring insulation, the actual situation is that it has not been possible to use a stage winding configuration of two or more rows.

[Objective] of the invention] The present invention has been made in consideration of the above circumstances, and therefore, its purpose is to simplify the winding work and easily achieve automation, as well as improve insulation and deformation of the coil. An object of the present invention is to provide a stator coil that can prevent displacement.

[Summary of the Invention] In the present invention, the flatness of the magnet wire is set to 5 to 20, and the magnet wire is wound in one row, and the plane including the U-shaped portion is aligned with the center of the U-shaped portion and the stator. It is shaped so that it is inclined at an angle of 15° to 45° with respect to the plane connecting the central axis, which eliminates the need for interlayer insulators and reduces the degree of twisting at both ends of the U-shaped part. It is distinctive in that it is made small to prevent abnormal deformation of this part.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The rectangular magnet wire 22 used for forming the coil 21 of this embodiment is a rectangular enameled wire with an oblateness of 5 to 20.The rectangular enameled wire 22 is wound in one row and formed into a hexagonal shape. , a coil 21 is configured.

At the center of the coil end portion 23 of this coil 21,
A U-shaped portion 24 is formed;
The plane 25 including the U-shaped portion 24 is the center 2 of the U-shaped portion 24.
1 with respect to the plane 27 connecting 6 and the central axis 11 of the stator 8
It is shaped to be inclined at an angle θ2 of 5° to 456°.

According to this embodiment as described above, the flatness of the rectangular enameled wire 22 is set to 5 to 20, making it larger than the conventional one, so the coil 21 is configured to have one winding as in this embodiment. However, it is possible to make the cross-sectional area and number of turns of the coil 21 the same as those of the conventional coil. Moreover, since it has a single row winding configuration, the conventional interlayer insulator is not required, and the winding work is simplified and automation can be easily achieved. Furthermore, since there is no interlayer insulator, which was the main cause of voids when insulating varnish is impregnated and cured in conventional double-row coils, the number of voids in the varnish cured layer can be significantly reduced. , the insulation properties can be improved. Further, the inclination angle θ2 of the U-shaped portion 24 is set to 15° to 4°.
Since the angle is set at 5°, which is larger than before, the degree of twisting at both ends of the U-shaped portion 24 can be made much smaller than before.
The bending stress applied to both end portions of the character-shaped portion 24 can be significantly alleviated. Therefore, it is possible to suppress deformation deviation of the coil 21, improve the shape of the coil 21 after molding, and prevent abnormal deformation of both ends of the U-shaped part 24, so that the enamel coating of that part can be prevented. This can prevent cracks from forming. Furthermore, because of the single-row configuration, the shared voltage between the lines is equalized, so insulation deterioration due to electrical factors is suppressed, and together with the above-mentioned circumstances, this can contribute to improving insulation quality.

By the way, as the oblateness of the rectangular enameled wire 22 increases, the bending stress applied to both ends of the U-shaped portion 24 increases, but if the oblateness is 20 or less, deformation deviation and abnormal deformation can be prevented. It can be kept within the permissible range.

Moreover, if the aspect ratio is made smaller than 5, it becomes difficult to ensure the number of windings, resulting in poor practicality. On the other hand, if the inclination angle θ2 of the U-shaped portion 24 is made larger than 45°, the degree of twisting at both ends of the U-shaped portion 24 increases, and the deformation deviation and abnormal deformation become large beyond the allowable range. Therefore, the purpose of the present invention cannot be achieved.

[Effects of the Invention] As is clear from the above description, the present invention sets the flatness of the magnet wire to 5 to 20 and winds it in a single row, and also sets the inclination angle of the U-shaped portion to 15°. 〜45°
The degree of twisting at both ends of the U-shaped portion was reduced by setting As a result, there is no need for interlayer insulators, making the winding work easier. 11. This has the excellent effect of easily automating the winding work, improving insulation, and suppressing abnormal deformation and deformation deviation.

[Brief explanation of drawings]

Fig. 1 is a side view of a coil end portion showing an embodiment of the present invention, Fig. 2 is a sectional view thereof, Figs. 3 to 5 show a conventional example, and Fig. A perspective view of the whole, FIG. 4 is a view corresponding to FIG. 1, and FIG. 5 is a view corresponding to FIG. 2. In the drawing, 8 is a stator, 22 is a rectangular enameled wire (magnet wire), 23 is a coil end portion, and 24 is a U-shaped portion. Agent Patent Attorney Nori Ken Yudo Yoni Hiroshi Mata Sparrow 1 Figure 2 Figure s 3 Figure 3' Figure 5

Claims (1)

[Claims] 1. A rectangular magnet wire is wound and formed into a hexagonal shape, and the coil end has a U-shaped part in the center, and the flatness of the magnet wire is set to 5 to 20. Set and wind this in one row, and the plane including the U-shaped portion is inclined at an angle of 15° to 45° with respect to the plane connecting the center of the U-shaped portion and the central axis of the stator. A stator coil characterized by: