JPS60183947A - Stator of rotary electric machine - Google Patents

Abstract

PURPOSE:To equalize the temperature rise of a stator winding by increasing the hole of a hollow strand at the rotary side of a rotor larger than the hole of the other portion. CONSTITUTION:A stator winding 3a is formed by laminating a plurality of hollow strands 6a having holes for flowing coolant in widthwise and heightwise directions, and arranged at least in two or more rows in the widthwise direction. The holes 8 of the hollow strands 6 of two rows in the widthwise direction are increased larger than the holes 9 of the other hollow strands 6a. Thus, the coolant amount flowed to the hollow strand 6a of the side that the rotor is rotated and the hole 8 is increased is increased larger than that flowed to the other hollow strand 6a, thereby equalizing the temperature rise of the winding 3a.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a stator for a rotating electric machine.

[Background of the invention]

FIG. 1 shows a conventional example of a turbine generator. As shown in the figure, the generator has a stator and a rotor 1.
The stator is comprised of a stator winding 3 housed in a stator core 2 and having an end protruding from the bracketed stator core 2 in the axial direction. This fixed pre-winding 1il113 is formed by stacking a plurality of hollow strands (not shown) in the width direction and height direction, shouldering holes through which the refrigerant flows, and at least two rows in the width direction. The above are arranged.

In the figure, 4 is a duct, and 5 is a rotor winding.

At the end of the stator core 2 of the turbine generator configured in this way, the situation of magnetic flux generation and the relationship between the radial magnetic flux density and the stator winding end position are shown in Figure 2. , the magnetic flux G generated by the stator winding 3 and the rotor winding 50 causes concentration of the magnetic flux G at the end of the stator core 2. The magnitude of this magnetic flux G is quite different between when the three phases of the generator are shorted, as shown by the curve P indicated by the dotted line in the figure, and when the generator is at the rated load, as shown by the curve Q indicated by the disaster line in the figure. At this time, the magnetic flux density concentrated at the end of the stator winding 3 increases. In this way, the magnetic flux G concentrated at the end of the stator winding 3 increases at the rated load, so the vertical axis shows the fixed pre-winding #113 and the horizontal axis shows the strand '! J, strand electric current of stator winding 3 f) i
As shown in FIG. 3, which shows the change in t, an electromotive force is prevented between each hollow wire (holes are not shown) of the stator winding 3, and based on this electromotive force, The circulating current makes the current distribution in each hollow strand non-uniform. For this reason, even if a three-phase short circuit test is performed at the factory, when the rated load is applied under the installed conditions at the site, the temperature of the child@Su3 will rise partially due to the non-uniform component of the current distribution of each hollow strand. There was a risk of damaging the insulation in the area where the temperature rose.

[Purpose of the invention]

The vagueness is considered to be a derogation from the above points, and the object is to provide a stator for a rotating electrical machine that makes it possible to equalize the temperature rise of the stator windings.

[Summary of the Invention J That is, the present invention comprises a stator core disposed opposite to a rotor, and a stator winding housed in the stator core and having seven ends protruding in the axial direction from the stator core. The stator winding is a rotating electric machine in which a plurality of hollow cables having holes through which refrigerant flows are stacked in the width direction and height direction, and at least two rows or more are arranged in the width direction. In the stator, in the fixed pre-winding 'ifM, all or some of the holes in the hollow wires in at least half of the rows in the width direction IIjI on the side where the rotor rotates are replaced with other hollow wires. It is characterized by a larger hole in the wire,
As a result, the amount of refrigerant to be traced to all or part of the hollow strands on the side where the rotor rotates is vr:, and the amount of refrigerant to be traced is
The amount will be greater than the amount of refrigerant in circulation.

The authors studied how to even out the temperature rise of the stator windings. Fourth, a conventional example of a stator winding is shown. As shown in the figure, the hollow strand 6 is provided with holes 7 through which the refrigerant flows. As shown in Figure 1, there is a magnetic flux Φμ in the radial direction and a magnetic flux 0 in the tangential direction. i 几2
A circulating current called ゜IT flows, i几1 + ”'! +
In the 1, 2, and 3.4 portions of A where τ flows in the same direction, the wire current increases as shown in FIG. 3 above. The part where this strand current is large and the temperature is high is the magnetic flux Φ in the radial direction.
This position is determined by the direction of R and the tangential magnetic flux 0. The tangential magnetic flux 0 is determined by the rotational direction of the rotor, and the radial magnetic flux Φ3 comes from the inner circumferential side of the rotor, so this position is This is the stator winding in the row on the rotating side and close to the rotor side. Therefore, it is only necessary to suppress the temperature rise in the hollow strands of the stator winding on the rotating side of the rotor, and to do this, the holes in the hollow strands on the rotating side of the rotor should be made larger than the holes in other parts. If this is done, the amount of refrigerant flowing into these large holes will increase, resulting in better cooling, suppressing local temperature rises in the hollow strands, and making it possible to even out the rise in temperature of the stator windings. It was done. Therefore, in the present invention, in the stator winding, all or some of the holes in the hollow strands of at least half of the rows in the width direction are formed on the side where the rotor rotates, and the holes in the other hollow strands are fixed. Shiinu asked. By doing so, it is possible to obtain a stator for a rotating electrical machine that makes it possible to make the temperature rise of the stator windings uniform.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. FIG. 6 shows an embodiment of the invention. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the fixed prewinding i3a is placed on the side where the rotor rotates.
And two rows of hollow stacks in the width direction #t! The hole 8 of 6a was made larger than the hole 9 of the other hollow wire 6a. By doing this, the amount of refrigerant flowing through the hollow strands 6a on the side where the rotor rotates, with the holes 8 enlarged, is increased. This allows the stator of the machine to rotate, which makes it possible to even out the temperature rise of the stator winding 3a.

That is, the holes 8 of the hollow strands 6a in the row on the rotation side of the rotor of the stator winding 3a near the rotor side are connected to other hollow strands #6.
Hole 9 in A was made larger. By doing this, the amount of refrigerant flowing into the hollow strands 6a of the stator winding 3a on the rotation side of the rotor increases, for example, the amount of cooling water, so that the rotor is well cooled). It is possible to suppress a local temperature rise of the hollow strand 6a.

In this embodiment, the holes 8 in all the hollow strands 6a in two rows in the width direction on the side where the rotor of the stator winding 3a rotates are enlarged, but this is not limited to only this, and some parts may be heated. The hole may be made larger only in the hollow strand 6a where the height is higher. By doing this, when the overall hole is enlarged, it is possible to prevent the copper area of the hollow strand 6a from decreasing and the loss occurring in the hollow strand 6a from increasing, and the required amount of cooling water from increasing. Overall loss and amount of cooling water can be reduced.

〔Effect of the invention〕

As described above, the present invention suppresses the local temperature rise of the hollow strands of the stator winding on the rotating side of the rotor, making it possible to make the temperature rise of the stator winding uniform. This makes it possible to obtain a stator for a rotating electric machine that makes it possible to uniformize the temperature rise of the stator windings.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional side view of the main part of a turbine generator using the stator of a conventional rotating electric machine, and Fig. 2 shows the operating state of the turbine generator using the stator of a conventional rotating electric machine and the magnetic flux density on the stator winding. 3 is an explanatory diagram showing the current distribution of the strands of the stator winding of the stator of a conventional rotating electrical machine. FIG. 4 is a longitudinal cross-sectional side view of the stator winding of the stator of a conventional rotating electrical machine. Figure, 5th
The figure is an explanatory diagram showing the flow of circulating current according to the magnetic flux direction of the stator winding of the stator of a conventional rotating electrical machine, and FIG. 6 is a longitudinal cross-section of the stator winding of an embodiment of the stator of the rotating electrical machine of the present invention. In the side view, 1...Rotor, 2...Stator core, 3a...Stator winding, 6a...Hollow strand, 8...Large hole in the center line. Shida hole, 9...A hole in the hollow strand, which is smaller than hole 8. Agent Patent Attorney Hiroo Nagasaki (and 1 other person) 3rd Fixed $4-

Claims (1)

[Claims] 1. A stator core disposed opposite to a rotor, and a stator winding housed in the stator core and having an end thereof protruding in the axial direction from the stator core, the stator winding In the stator of a rotating electric machine, in which a plurality of hollow strands having holes through which a refrigerant flows are stacked in the width direction and the height direction, and are arranged in at least two rows in the width direction, the stator winding The wire is characterized in that all or some of the holes in the hollow wires in at least half of the rows in the width direction on the side where the rotor rotates are made larger than the holes in the other hollow wires. Stator of rotating electric machine.