JP3797752B2 - Rotating electric machine stator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stator of a rotary electric machine such as a turbine generator, a turbine generator, etc., and more particularly, a rotary electric machine in which a ventilation duct is formed using a duct piece and cooling capacity of the stator core and the stator winding is improved. Related to the stator.
[0002]
[Prior art]
The rotating electrical machine is generally composed of 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 plates, and further inserting a wedge at the slot entrance to fix the stator winding to the stator. . The core secures a ventilation duct serving as a cooling air passage by inserting at least one spacer called a duct piece radially each time a plurality of steel plates are laminated. The duct piece is made of square-shaped I-shaped steel or square steel.
[0003]
FIG. 7 shows the structure of a stator of a rotating electric machine according to the prior art. In the figure, 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, and 4 is radially from the inner diameter side to the outer diameter side. A duct piece arranged and fixed to the core 1 by welding, 5 is a ventilation duct formed by the duct piece 4, and 6 is a slot. The core 1 is laminated with a duct piece 4 sandwiched between magnetic steel sheets laminated by a predetermined number. The laminated body thus formed is bolted via a clamping plate (not shown).
[0004]
In the figure, 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]
[Problems to be solved by the invention]
In recent years, with increasing demand for electric power, rotating electrical machines have become higher in voltage and capacity, and the amount of heat generated from windings during operation has also increased. For this reason, it is important to efficiently cool the rotating electrical machine.
[0006]
However, as shown in the prior art, if the end shape of the duct piece 4 is square at the inlet of the ventilation duct 5, the ventilation resistance at the inlet of the ventilation duct 5 is increased and the cooling air is difficult to enter the ventilation duct 5. There was a problem.
[0007]
The present invention has been made in view of the above-described problems, and optimizes the shape and arrangement of the duct piece at the inlet of the ventilation duct to improve the ventilation performance and to reduce the size of the stator of the rotating electrical machine. It is intended.
[0008]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
[0009]
A plurality of cores formed by laminating a predetermined number of magnetic steel sheets each having a plurality of slots formed in a radial direction for inserting windings, and a duct piece disposed at a predetermined interval between the plurality of cores. A rotating electric machine stator in which the plurality of cores are stacked via the duct pieces, wherein the plurality of duct pieces are arranged at predetermined intervals between the slots of the stacked cores. The side adjacent to the winding at the inner diameter side end of the plurality of duct pieces is formed in a taper shape, and, of the plurality of duct pieces, the inner diameter side of the duct piece located in the lower direction of the rotor rotation direction The end portion is arranged on the outer diameter side with respect to the inner diameter side end portion of the duct piece located at the upper position.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
First, the stator of the rotating electrical machine according to the first embodiment of the present invention will be described with reference to FIGS.
[0013]
FIG. 1 is a perspective view of a stator structure of a rotating electrical machine according to each embodiment of the present invention.
[0014]
In the figure, 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, and 41 and 42 are inner diameters. It is a duct piece which is radially arranged from the side to the outer diameter side and is fixed to the core 1 by welding, and I-shaped steel or square steel is used. Reference numeral 5 denotes a ventilation duct formed by the duct pieces 41 and 42, and 61 and 62 denote slots for accommodating the windings 21 and 22. The core 1 is laminated by sandwiching duct pieces 41 and 42 every time a predetermined number of electromagnetic steel sheets are laminated, and the entire laminated core 1 is bolted by a clamping plate 7.
[0015]
FIG. 2 is a sectional view taken along line AA in FIG.
[0016]
In the figure, 411 and 421 are taper surfaces at the inner diameter side ends of the duct pieces 41 and 42, arrow B indicates the rotation direction of the rotor (not shown), and arrow C indicates the cooling air generated by the rotation of the rotor. Indicates the direction of flow. The other configuration shown in FIG. 2 is the same as that shown in FIG.
[0017]
Usually, the inner diameter side end portions of the duct pieces 41 and 42 arranged in the ventilation duct 5 and the mounting positions of the duct pieces 41 and 42 greatly affect the cooling performance, particularly the cooling performance of the windings 21 and 22.
[0018]
Therefore, in this embodiment, as shown in FIG. 2, the inner diameter side ends of the duct pieces 41 and 42 at the inlet of the ventilation duct 5 are processed into a taper of approximately 45 °.
[0019]
The duct pieces 41 and 42 are radially arranged between the slots 61 and 62 so that the cooling air passes from the inner diameter side to the outer diameter side. Furthermore, in order to secure more ventilation during operation and suppress the temperature rise of the windings 21 and 22, the taper surfaces 411 and 422 of the duct pieces 41 and 42 are arranged toward the adjacent windings 61 and 62, respectively. Set up.
[0020]
The duct pieces 41 and 42 are preferably separated from the slots 61 and 62. However, the magnetic steel plates are laminated with the duct pieces 41 and 42 interposed therebetween, and the entire laminate is bolted via the clamping plate 7. Therefore, the tightening force on the surfaces of the slots 61 and 62 decreases as the duct pieces 41 and 42 are separated from the slots 61 and 62. Therefore, the intervals between the duct pieces 41 and 42, the interval between the duct piece 41 and the slot 61, and the interval between the duct piece 42 and the slot 62 are substantially equal.
[0021]
In the present embodiment, when a rotor (not shown) rotates in the rotation direction B, the air around the rotor is moved from the outer periphery of the rotor to the stator side as indicated by an arrow C. Released and pressed into the ventilation duct 5. Part of the injected 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 side by the tapered surface 421 of the duct piece 42. And effectively cools the winding 22.
[0022]
Further, according to the present embodiment, the outer diameter side end portions of the duct pieces 41 and 42 are processed into a taper shape of approximately 45 °, so that the ventilation resistance is reduced to about 1/5 compared with the case of the conventional rectangular shape. can do.
[0023]
FIG. 3 is an enlarged view of the inner diameter side ends of the duct pieces 41 and 42 shown in FIG.
[0024]
4 and 5 show modifications of the inner diameter side end portions of the duct pieces 41 and 42. FIG.
[0025]
The one shown in FIG. 4 has a rounded shape by rounding the end portion on the inner diameter side, and the one shown in FIG. 5 has a mountain 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.
[0026]
Next, a rotating electrical machine stator according to a second embodiment of the present invention will be described with reference to FIG.
[0027]
6 is a cross-sectional view taken along line AA of FIG.
[0028]
In the figure, reference numeral 43 denotes a duct piece located between the slots. The duct piece 431 is located at a lower position in the rotation direction of the rotor, that is, located downstream of the cooling air generated by the rotation of the rotor. It is a taper surface of a duct piece. The other components are the same as those shown in FIG.
[0029]
As shown in the drawing, in this embodiment, the duct piece 43 is arranged so that the inner diameter side end portion is located on the outer diameter side of the inner diameter side end portion of the duct piece 41 located on the upstream side. As a result, a larger amount of air can be taken into the downstream side of the tapered surface 431 of the duct piece 43 without impairing the amount of air taken into the upstream side of the duct piece 41.
[0030]
The inner diameter side end shape of the duct piece 43 in this case may be any of the shapes described above with reference to FIGS. 3, 4, and 5.
[0031]
In each of the above embodiments, the explanation has been made on the assumption that the rotating electrical machine has a salient pole rotor represented by a turbine generator, but the rotor structure may be cylindrical. Moreover, although the refrigerant | coolant was demonstrated on the assumption that it was air, other gas, such as hydrogen, may be sufficient.
[0032]
【The invention's effect】
In the present invention, inner end portions of a plurality of duct pieces arranged radially between slots are formed in a tapered shape, and the tapered portion is arranged so as to face adjacent windings. Therefore, it is possible to improve the cooling performance of the stator of the rotating electrical machine, particularly the winding, and to reduce the size of the rotating electrical machine.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a part of a stator of a rotating electrical machine according to each embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 according to the first embodiment of the present invention.
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.
6 is a cross-sectional view taken along line AA in FIG. 1 according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a part of a stator of a rotating electrical machine according to a conventional technique.
[Explanation of symbols]
1 Core 21, 22 Winding 41, 42, 43 Duct piece 5 Ventilation duct 61, 62 Slot 411, 421, 431 Tapered surface

Claims (1)

A plurality of cores formed by laminating a predetermined number of magnetic steel sheets each having a plurality of slots formed in a radial direction for inserting windings, and a duct piece disposed at a predetermined interval between the plurality of cores. Comprising, in a stator of a rotating electrical machine formed by laminating the plurality of cores via the duct piece,
A plurality of the duct pieces are arranged at predetermined intervals between the slots of the stacked cores, and the side adjacent to the winding at the inner diameter side end of the plurality of arranged duct pieces is formed in a tapered shape. Of the plurality of duct pieces, the inner diameter side end portion of the duct piece located in the lower part of the rotation direction of the rotor is disposed on the outer diameter side of the inner diameter side end part of the duct piece located in the upper order. A stator of a rotating electrical machine.

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