JPS60245438A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To reduce magnetic saturation, by a method wherein the first width between T's on the magnetizing side of a rotor is organized larger than the second width and the following widths between T's on the side, and the first width between T's on the demagnetizing side is organized smaller than the second width and the followig widths between T's on the side. CONSTITUTION:Inside a cylindrical stator 1, a cylindrical rotor 2 is arranged on the same axis. Distributed windings are attached to rotor slots 3 extending in the direction of a rotary shaft and round the rotor 2, and T's 4 are provided between the rotor slots 3. The first width between T's 4a on the magnetizing side of the rotor 2 is organized larger than the second width between T's 4b on the side, and the first width between T's 5a on the demagnetizing side is organized smaller than the second width between T's 5b on the side. As the result, magnetic saturation is reduced with less loss and a rotary electric machine of high efficiency can be provided.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to rotating electric machines, such as generators and electric wJ#s having cylindrical rotors. There were those shown in Figures 1 and 2. The figure shows, for example, a cross section perpendicular to the rotation axis of a rotating electrical machine composed of two poles, [11 is a cylindrical stator, (2) is arranged coaxially inside stator +11. A cylindrical rotor (31 is a rotor slot extending in the direction of the rotational axis around the rotor (21), in which a distributed winding l& (not shown) is accommodated. (4) is a rotor slot (3
), +6) is a rotor ball,
In this two-pole machine, it is installed at a position rotated by II'118G degrees.

(7) is a stator slot provided on the inner periphery of the stator +11 and extending in the direction of the rotation axis, and a distributed winding (not shown) is installed in the stator slot.

Normally, in a rotating electrical machine such as the one mentioned above, the rotor slot (C
It operates by linkage between the main magnetic flux created by the winding current caused by the distributed winding in the stator slot (7) and the winding current caused by the distributed winding in the stator slot (7). At this time, due to the armature reaction caused by the @ wire current in the stator slot (7), the magnetic flux (8) is unevenly distributed as shown in Fig. 2, and the two rotor balls (6)
The amount of magnetic flux passing through the teeth (4) between them changes from the magnetizing side to the demagnetizing side.

Therefore, from the teeth adjacent to one rotor ball (6), the first teeth on the magnetization side (4 towns, the second teeth (4b), the 8th teeth (4c), etc.
The order is the 8th tooth (5C), the 2nd tooth (5b), and the 1st tooth (5a) on the demagnetizing side.
The first teeth (5a) on the demagnetized side are adjacent to the other rotor ball (6).

However, since the teeth (4) in a conventional rotating electric machine are all composed of the same single tooth from the magnetizing side to the demagnetizing side, the first tooth (4a) on the magnetizing side where the amount of magnetic flux is the largest magnetic saturation may occur. When magnetic saturation occurs, the magnetic flux (8) passing between line A and B, which is the yoke magnetic path width, increases by 7jic. Therefore, more field ampere turns are required to compensate for this amount of gold, leading to an increase in field copper loss.

[Summary of the Invention] This invention was made to eliminate the drawbacks of the conventional ones as described above, and the first tooth width on the magnetization side of the rotor is configured to be wider than the second and subsequent teeth widths. However, by configuring the width of the first tooth on the demagnetizing side to be narrower than the width of teeth after the second scan, it is possible to reduce magnetic saturation and reduce loss, thereby providing a highly efficient rotating electric machine. The purpose is

[Embodiments of the invention]

Hereinafter, an example #i of this invention will be explained with reference to the drawings. In FIG. 8, the width of the first teeth (4a) on the magnetizing side of rotor +21 is set to be wider, for example, about 1.1 to 2.0 times the width of the second teeth (4b), and The width of the first teeth (5a) on the magnetic side is narrower, for example, by about 0.9 to 0.8 times, than the width of the second teeth (5b) II.

Here, in this embodiment, the second teeth (4
The width is the same from b) to the second tooth (5b) on the demagnetized side. Figure 4 shows an enlarged cross section of the vicinity of the rotor ball 16). xl is the first tooth width on the magnetizing side, X! is the first tooth width on the demagnetized side, X is the other tooth width, and each tooth width has L > Xa ) Xs
There is a relationship between

Increasing the width of the first teeth (4a) on the magnetizing side, which caused magnetic saturation, reduces the magnetic saturation.
I can do it. Furthermore, this tooth (4a) is the first on the demagnetizing side of the magnetic flux (8) in order to make it possible to widen the gold.
Since the width of the second tooth (5a) is narrowed, the amount of magnetic flux that passes between line A and B, which is the yoke magnetic path width, increases, and therefore the field ampere turns can be reduced. is reduced, allowing efficient operation.

In addition, in the above embodiment, the width is the same from the second tooth on the magnetizing side to the second tooth on the demagnetizing side. The same effect as the example is achieved.

Furthermore, although the above embodiment 1C has been described in the case of a two-pole machine, it can also be applied to a multi-pole machine with four or more poles, and the same effects as in the above embodiment can be expected.

〔Effect of the invention〕

As described above, according to the present invention, the cylindrical shape has a predetermined height in the radial direction, a predetermined height in the circumferential direction, and a plurality of teeth extending in the central axis direction around the circumference of the cylinder. In the rotation range Iavc where the rotor ball occurs, the width of the first tooth on the Jl magnetic side of the rotor is configured to be wider than the width of the teeth on the second and subsequent scans, and the width of the first tooth on the demagnetized side and its second By configuring the tooth width υ to be narrower than the width of the teeth after the second tooth, the magnetic saturation is completely reduced, the field ampere-turn is reduced, and a further effect can be obtained by providing an efficient rotation ta.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional rotating electrical machine, FIG. 2 is an explanatory diagram showing the biased strain distribution of the magnetic flux, FIG. 8 is a sectional view showing a rotating electrical machine according to a 1× example of the present invention, The figure is an enlarged sectional view of a part of FIG. 8. +21--1 cylindrical rotor, +41- teeth, (4
a)′″-@1st tooth on magnetizing side, (4b)
--- Second scan teeth on magnetizing side, (5a) ---
1st tooth on one demagnetization side, (5b)--24th tooth on one demagnetization side. In the drawings, the same reference numerals indicate 11-1 or equivalent parts. Agent Masuo Oiwa No. 1rXJ Figure 2 Figure 3

Claims (1)

[Claims] A predetermined distance in the radial direction of the cylinder and a predetermined width in the circumferential direction, and teeth extending in the central axis direction are placed around the circumference of the cylinder.
4i. In a rotating machine with several cylindrical rotors, the width of the first tooth on the magnetizing side of the rotor is configured to be wider than the width of the teeth on the second and subsequent teeth, and the demagnetization of the rotor is performed. A rotating electric machine characterized in that the first tooth on the side is configured to be narrower than the width of the second and subsequent teeth.