JP2000188836A - Stator in dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator in a dynamo-electric machine with improved cooling performance, by optimizing an edge shape of a duct piece as a ventilation duct on the inner diameter side, and a position of the duct piece. SOLUTION: A stator in a dynamo-electric machine includes a plurality of cores 1 constituted of flat rolled magnetic steel sheets and strip, having a plurality of slots 61 and 62 for inserting windings 21 and 22 in a radial direction and laminated in prescribed number of ply layers, and a ventilation duct 5 formed by inserting a duct pieces 41 and 42 with a tapered inner edge part between each core 1. The duct pieces 41 and 42 are provided at given intervals at each part between the slots 61 and 62, and the tapered parts 411 and 421 of the duct pieces 41 and 42 are placed so as to face the windings 21 and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a rotating electric machine such as a water turbine generator and a turbine generator, and more particularly to a ventilation duct formed by using a duct piece to form a stator core and a stator winding. The present invention relates to a stator for a rotating electric machine with improved cooling ability.

[0002]

2. Description of the Related Art A rotating electric machine generally includes a stator and a rotor. The stator is formed by inserting a stator winding into a slot of a core formed by laminating electromagnetic steel sheets, further inserting a wedge into a slot entrance and fixing the stator winding to the stator. . In the core, at least one spacer called a duct piece is radially inserted every time a plurality of steel plates are stacked to secure a ventilation duct that serves as a passage for cooling air. For this duct piece, I-shaped steel or square steel having a square end is used.

FIG. 7 shows a structure of a stator of a rotating electric machine according to the prior art. In the drawing, 1 is a core in which a plurality of electromagnetic steel sheets are laminated, 2 is a winding inserted in a slot formed in the core 1, 3 is a wedge for fixing the winding 2, 4
Are radially arranged from the inner diameter side to the outer diameter side, and are fixed to the core 1 by welding. The duct pieces 5 are ventilation ducts formed by the duct pieces 4, and the slots 6 are slots.
The core 1 is laminated with a duct piece 4 interposed between a predetermined number of laminated electromagnetic steel sheets. The laminate thus formed is bolted through a clamping plate (not shown).

In the drawing, when a rotor (not shown) rotates in the direction of arrow D, the air pushed by the rotor flows through the ventilation duct 5 and cools the core 1 and the winding 2 between the ventilation ducts 5. .

[0005]

In recent years, as the demand for electric power has increased, the rotating electric machine has been increased in voltage and capacity, and the amount of heat generated from the windings during operation has been increasing. For this reason, it is important to efficiently cool the rotating electric machine.

However, as shown in the prior art, if the end of the duct piece 4 is rectangular at the entrance of the ventilation duct 5, the ventilation resistance at the entrance of the ventilation duct 5 increases, and the cooling air flows into the ventilation duct 5. There was a problem that it was difficult to enter.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and optimizes the shape and arrangement of a duct piece at a ventilation duct entrance to improve ventilation performance and reduce the size of a stator of a rotating electric machine. It is intended to aim at.

[0008]

The present invention employs the following means in order to solve the above-mentioned problems.

[0009] A plurality of cores in which a predetermined number of electromagnetic steel plates having a plurality of slots for inserting windings in the radial direction are laminated, a duct piece is provided between the plurality of cores, and a predetermined interval is provided between the slots. And a ventilation duct formed by arranging the duct pieces in the stator, wherein the duct piece has a tapered inner end portion, and at least one duct piece is arranged between the cores. It is characterized by having been done.

[0010] At least a tapered portion of the duct piece is disposed so as to face an adjacent winding.

Further, of the plurality of duct pieces, the inner diameter side end of the duct piece positioned lower in the rotor rotation direction is disposed closer to the outer diameter side than the inner diameter side end of the duct piece positioned higher. It is characterized by the following.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a stator of a rotating electric machine according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a stator structure of a rotating electric machine according to each embodiment of the present invention.

In the drawing, 1 is a core in which a plurality of thin electromagnetic steel sheets are laminated, 21 and 22 are windings inserted into slots formed in the core 1, 3 is a wedge for fixing the windings 21 and 22, 41, 42 Is a duct piece radially arranged from the inner diameter side to the outer diameter side and fixed to the core 1 by welding, and is made of I-beam or square steel. 5 is duct piece 4
Ventilation ducts 61 and 62 are slots formed by the windings 21 and 22. The core 1 is laminated by stacking a predetermined number of electromagnetic steel sheets with the duct pieces 41 and 42 interposed therebetween, and the entire laminated core 1 is bolted by the clamping plate 7.

FIG. 2 is a sectional view taken along the line AA in FIG.

In the figures, reference numerals 411 and 421 denote tapered surfaces at the inner diameter side ends of the duct pieces 41 and 42, respectively, and arrows B
Indicates the direction of rotation of a rotor (not shown), and arrow C indicates the direction in which cooling air generated by the rotation of the rotor flows. The other configuration shown in FIG. 2 is the same as that shown in FIG.

Normally, the shape of the end portions on the inner diameter side of the duct pieces 41 and 42 arranged in the ventilation duct 5 and the duct piece 4
The mounting positions of the coils 1, 42 greatly affect the cooling performance, particularly the cooling performance of the windings 21, 22.

For this reason, in the present embodiment, as shown in FIG.
2 is processed into a tapered shape of approximately 45 °.

The duct pieces 41 and 42 are arranged radially between the slots 61 and 62 so that the cooling air passes from the inner diameter side to the outer diameter side. Further, in order to secure more ventilation during operation and to suppress a rise in the temperature of the windings 21 and 22, the tapered surfaces 411 and 42 of the duct pieces 41 and 42 are provided.
2 are arranged toward the adjacent windings 61 and 62, respectively.

It is preferable that the duct pieces 41 and 42 are apart from the slots 61 and 62. However, electromagnetic steel sheets are laminated with the duct pieces 41 and 42 interposed therebetween, and the entire laminate is bolted via the clamping plate 7. Since the duct pieces 41 and 42 are separated from the slots 61 and 62, the tightening force on the surfaces of the slots 61 and 62 decreases. Therefore, the intervals between the duct pieces 41 and 42, the intervals between the duct pieces 41 and the slots 61, and the intervals between the duct pieces 42 and the slots 62 are arranged to be substantially equal.

According to the present embodiment, when the rotor (not shown) rotates in the rotation direction B, the air around the rotor is fixed from the outer periphery of the rotor as shown by the arrow C. It is discharged to the child side and is pressed into the ventilation duct 5. A part of the press-fitted air is bent by the tapered surface 411 of the duct piece 41 to effectively cool the winding 21, and more air is pressed into the winding 22 by the tapered surface 421 of the duct piece 42. Thus, the winding 22 is cooled effectively.

Further, according to the present embodiment, since the outer diameter side end portions of the duct pieces 41 and 42 are formed into a tapered shape of approximately 45 °, the ventilation resistance is reduced by about 1 in comparison with the conventional rectangular shape.
/ 5.

FIG. 3 shows the duct pieces 41 and 42 shown in FIG.
It is an enlarged view of the inner diameter side end part.

FIGS. 4 and 5 show duct pieces 41 and 42, respectively.
7 shows a modified example of the end shape on the inner diameter side of FIG.

FIG. 4 shows a rounded shape obtained by chamfering the inner diameter side end, and FIG. 5 shows a mountain cut shape. Even with the inner diameter side end shape shown in such a modification, the ventilation resistance can be reduced to the same extent as that shown in FIG.

Next, a stator of a rotating electric machine according to a second embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a sectional view taken along line AA of FIG.

In the figure, reference numeral 43 denotes a duct piece located between the slots and located at a lower position in the rotating direction of the rotor, that is, located downstream of the cooling air generated by the rotation of the rotor. , 431 are tapered surfaces of the duct piece. Other components are the same as those shown in FIG.

As shown in the figure, in this embodiment, the duct piece 43 is arranged such that its inner diameter end is located on the outer diameter side than the inner diameter end of the duct piece 41 located on the upstream side. As a result, a larger amount of air can be taken in downstream of the tapered surface 431 of the duct piece 43 without impairing the amount of air taken in upstream of the duct piece 41.

In this case, the inner end portion of the duct piece 43 may have any of the shapes shown in FIGS. 3, 4 and 5 described above.

In each of the above embodiments, description has been made on the assumption that the rotating electric machine has a salient pole type rotor typified by a water turbine generator. However, the rotor structure may be cylindrical. Also, the refrigerant has been described on the premise of air, but may be another gas such as hydrogen.

[0032]

According to the present invention, the plurality of duct pieces radially arranged between the slots are formed such that the inner diameter side ends thereof are tapered, and the tapered portions are opposed to the adjacent windings. As a result, the cooling performance of the stator of the rotating electric machine, in particular, the windings can be improved, and the rotating electric machine can be downsized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a stator of a rotating electric machine according to each embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 according to the first embodiment of the present invention;
It is sectional drawing seen from A.

FIG. 3 is a perspective view of an end shape of a duct piece according to each embodiment of the present invention.

FIG. 4 is a perspective view showing a modification of the end shape of the duct piece according to each embodiment of the present invention.

FIG. 5 is a perspective view showing another modified example of the end shape of the duct piece according to each embodiment of the present invention.

FIG. 6 shows AA of FIG. 1 according to a second embodiment of the present invention.
It is sectional drawing seen from.

FIG. 7 is a cross-sectional view showing a part of a stator of a rotating electric machine according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core 21,22 Winding 41,42,43 Duct piece 5 Ventilation duct 61,62 Slot 411,421,431 Tapered surface

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shiyoshi Yanagisawa 3-1-1, Sachimachi, Hitachi-shi, Ibaraki F-term in Hitachi, Ltd. Hitachi Plant F-term (reference) 5H002 AA10 AB06 AD07

Claims (3)

[Claims] A plurality of cores formed by laminating a predetermined number of electromagnetic steel sheets each having a plurality of slots for inserting windings in a radial direction, and a duct piece interposed between the plurality of cores and a predetermined number interposed between the plurality of cores. In a stator of a rotating electrical machine, comprising: a ventilation duct formed at intervals, the inner diameter side end of the duct piece is formed in a tapered shape, and at least one or more pieces are provided between each core. A stator for a rotating electric machine, wherein the stator is provided. 2. The stator for a rotating electric machine according to claim 1, wherein at least a tapered portion of the duct piece is arranged to face an adjacent winding. 3. The method according to claim 1, wherein
In one of the claims, among the plurality of duct pieces, the inner diameter side end of the duct piece positioned lower in the rotor rotation direction is arranged closer to the outer diameter side than the inner diameter side end of the duct piece positioned higher. A stator of a rotating electrical machine characterized by: