JPH0974698A - Coil field type rotor for electric rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deflection of a rotor coil as a heating element due to a centrifugal force during its rotation and also to make it possible to cool the rotor coil. SOLUTION: By paying attention to the shape and fixing method for a holder 13, a cross section of the holder 13 is made to a shape of isosceles triangle and is coupled directly to a second core 9a with holder bolts 14 or the like, and thus the deflection of a rotor coil 8 by a centrifugal force can be prevented during the rotation of the rotor coil 8. Also, the holder 13 is made of a metal, its heat dissipation can be improved, and also the rotor coil 8 can be cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound field type rotor of a rotary electric machine used for a rotary electric machine such as a wound field generator.

[0002]

2. Description of the Related Art In a winding field type rotary electric machine that rotates at a high speed, the rotor coil rises in temperature due to heat generated by an exciting current or heat transfer from a stator, which causes a decrease in output and impregnating agent that fixes the coil. There is a possibility that the rotor coil may bend due to the synergistic effect of the decrease in the sticking force and the centrifugal force, and in the worst case, problems such as coil disconnection and short circuit may occur.

Further, if the exciting current is increased in order to compensate for the decrease in output, there is a problem that the temperature rises further and the bending of the coil is accelerated. In order to solve this problem, as disclosed in Japanese Utility Model Laid-Open No. 62-51935 shown in FIG. It was necessary to take measures such as inserting the ring 600 into the portion and inserting the holder 300 and the wedge 400 between the coils.

In this method, however, the ring 600 receives both the centrifugal force applied to the coil end portion and the centrifugal force applied to the holder 300 and the wedge 400.
00 itself needs to be made of a considerably strong member, and a holder 300 having a length substantially equal to that of the first core is required. As for the material of the ring 600, for example, if it is an iron-based material, it is strong, but it causes deterioration of performance due to leakage of magnetic flux, and if it is an aluminum-based material, it requires a considerable thickness. Subject to the above restrictions. Therefore, in the case of a rotor rotating at a higher speed, the above measures are not sufficient.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the coil of a rotor, which is a heating element, from being bent due to centrifugal force during rotation, and to cool the rotor coil.

[0006]

In order to achieve the above object, the present invention has a plurality of rotor coils wound around a salient pole-shaped first core as set forth in claim 1. In a winding field type rotor of a rotating electric machine configured by a substantially cylindrical second core that fits and holds the rotor coil, and a shaft that penetrates the central portion, between adjacent rotor coils, Insert a holder made of metal and having a total length shorter than the first core length and a cross section of an approximately isosceles triangle so as to press the adjacent rotor coils 8 at the equilateral sides of the triangle, and the holder is inserted in the radial direction. Further, the technical means of fixing to the second core by using a connecting means such as a holder bolt is adopted.

According to the present invention, paying attention to the shape and fixing method of the holder, the cross section of the holder has an isosceles triangular shape and is directly connected to the second core by a holder bolt or the like. It is possible to prevent bending of the rotor coil due to centrifugal force during rotation. In addition, since the holder is made of metal, it is possible to improve heat dissipation and cool the rotor coil.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a winding field type generator 1 according to the present invention.
2 is a sectional view taken along the axial direction of FIG. 2, and FIG. 2 is a view of the winding field type rotor of the present invention as viewed from A in FIG. 1 and 2, the stator 3 is fitted and held in the front housing 2 coaxially with the housings 2 and 11. A stator coil 4 is wound around the stator 3, and the end of the coil is connected to an output terminal (not shown) and output to the outside.

The rotor 6 is constructed by fixing a plurality of rotor coils 8 wound on a first core 7 made of an iron-based material to a second core 9a, and a shaft 9 penetrating the central portion thereof. By the plurality of bearings 10 press-fitted at both ends of the front housing 2 and the rear housing 11,
The housings 2 and 11 are integrated by a housing bolt 12.

At this time, the rotor coil 8 is impregnated with an insulating resin in order to improve vibration resistance. The holder 13 having a length shorter than the length of the first core 7 and a cross section having a substantially isosceles triangular shape is inserted between the rotor coils 8 so as to press the rotor coils 8 of which the equilateral sides are adjacent to each other.
It is fixed to the second core 9 a fitted to the shaft 9 by the number 4.

The rings 15 are attached to both ends of the rotor 6 so as to cover the rotor coil ends 16, and are fixed to the first core 7. The slip ring 17 is arranged at a position where it slides on the brush 18 at one end of the shaft 9, and the brush 18 is fixed to the rear housing 11 by a housing bolt 12 or the like.

Next, the operation will be described. Rotor 6
A so-called electromagnet receives an exciting current from the outside through a brush 18 and a slip ring 17, and rotates inside the stator 3 to induce an electromotive voltage in the stator coil 4 and output electric power to the outside through an output terminal (not shown). . At this time, Joule heat due to the current and iron loss due to the alternating magnetic flux are generated in the rotor 6 and the stator 3 to heat the generator. These heats are finally radiated into the air from the outer peripheral portions of the housings 2 and 11.

Here, the rotor 6 is rotating inside the winding field type generator, and the two housings 2 and 11 are connected to the shaft 9,
Only by assembling through the bearing 10, the generated heat has to be transferred or radiated to the stator 3 and the housings 2 and 11 via the air in the winding field generator 1 to cool it. It tends to become hotter than the stator 3. Of course, it is conceivable to forcibly introduce air from the outside with a cooling fan or the like, but this is not preferable in terms of environmental resistance.

When the high-temperature rotor 6 rotates in such an atmosphere, a centrifugal force F acts on each rotor coil 8 in the radial direction, and the rotor coil 8 is rotated by the first core 7 due to the component in the rotation direction. The force F1 that tries to pull it away from works. (See FIG. 2) As a result, in the conventional wound field type rotor, the rotor coil 8
Is separated from the first core 7, the rotor coil 8
Further centrifugal force acts on the rotor, and finally, it is projected from the outer diameter of the rotor and interferes with the stator 3.

In order to avoid such a problem, the rotor coil 8 is impregnated with an insulating resin, but the effect cannot be expected at a high temperature due to a decrease in resin strength. Against the peeling of the rotor coil 8 by such a centrifugal force, the holder 13 according to the present invention whose cross section is an isosceles triangle is sandwiched between the rotor coils 8 and the equilateral sides of the triangles are adjacent to each other, and the rotor coils 8 are pressed against each other. If it is inserted and fixed to the second core 9a by the holder bolts 14, the rotor coil 8 is continuously fixed to the first core 7, so that not only this problem is prevented but also the heat of the rotor coil 8 is absorbed. Since it radiates heat, it is effective in reducing the temperature.

When the main holder 13 is made of a material other than metal, for example, resin, not only the effect becomes thin due to the strength decrease at high temperature, but also the temperature decrease effect cannot be expected. On the other hand, since it is assembled independently of the ring 15, it is not necessary to consider the influence on the ring 15, the rotor coil 8 can be more firmly fixed, and the axial length thereof is the first core 7. Since it is shorter than the length, it can be mounted even after the ring 15 is assembled, and the assembling property is good.

If the number and size of the holder bolts 14 for fixing the holder 13 to the second core 9a are increased,
There is an advantage that it can correspond to further speeding up. In addition,
The first core 7 shown in FIG. 1 is formed by laminating thin plate-shaped metals, but may be, for example, a lump shape instead of a thin plate.

[Brief description of drawings]

FIG. 1 is a sectional view taken along an axial direction of a wound-field generator 1 according to the present invention.

FIG. 2 is a view of the winding field type rotor of the present invention viewed from A in FIG.

FIG. 3 is a structural diagram of an end surface of a rotor shown in Japanese Utility Model Laid-Open No. 62-51935.

[Explanation of symbols]

 6 rotor 7 1st core 8 rotor coil 9 shaft 9a 2nd core 13 holder 14 holder bolt

Claims (1)

[Claims] 1. A plurality of rotor coils wound around a salient pole-shaped first core, a substantially cylindrical second core into which the rotor coils are fitted and held, and a shaft which penetrates through the central portion thereof. In a wound-field type rotor of a rotating electric machine configured by, a holder made of metal and having a total length shorter than the first core length and a cross section of an isosceles triangle is formed into a triangular shape between adjacent rotor coils. Winding of a rotary electric machine, characterized in that the rotor coils are inserted so that their equal sides press the adjacent rotor coils, respectively, and the holder is fixed to the second core in the radial direction using a coupling means such as a holder bolt. Field type rotor.