JPH09312944A - Rotor of rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the prevention of insulation breakage by equipping a rotor with holes which are provided at a specified interval to pierce an end ring in the diameter direction, and a groove which ranges the holes in the circumference direction. SOLUTION: The end ring 5 of a rotor has cooling holes 6 piercing itself and provided at specified intervals and a groove 6a ranging the holes 6 in circumferential direction, and to the direction of a rotary shaft, an outer shim piece 7 is interposed between an iron core 2 and the end ring 5. Moreover, bind material 8 prevents the end projected from the iron core 2 of the coil 3 from shifting outward by the centrifugal force generated by the rotation of the rotor, by fastening a plurality of coil ends 4 folded continuously with each other. Then, a cooling air duct 9 cools the coil end 4 by passing a refrigerant within a rotating machine, with the cooling holes 6 provided at the coil end 4 and the end ring 5 as courses. As a result, insulation breakage can be prevented by preventing the partial temperature rise of the coil end part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a rotating electric machine, such as a DC machine, an induction machine, or a variable speed generator, which has a coil end provided with a binding material for rotating the rotating machine. Regarding the child.

[0002]

2. Description of the Related Art Generally, a rotor employed in, for example, a DC machine, an induction machine or a variable speed generator has a coil end portion protruding from an end portion of a rotor core, and restrains movement by centrifugal force due to the rotation. The binding material is used to do this.

FIG. 6 is a structural diagram of a rotor of a conventional rotary electric machine. In FIG. 6, around the rotor spoke 1,
An iron core 2 in which thin iron plates are laminated in a circular shape is provided, and a coil 3 is inserted and connected in a slot of the iron core to form a rotor coil winding.

The coil end 4 of the coil 3 is formed so as to project from the end portion of the iron core 3, and the coil end cooling holes 6 arranged on the inner circumference side at a certain interval on the circumference and the outer gap for pressing the end portion of the iron core 3 are formed. An end ring 5 having a piece 7 is provided, and a binding material 8 is provided on the outer peripheral side to prevent the coil end 4 from moving to the outer diameter due to the centrifugal force due to the rotation of the rotor, and at the same time, to bind the binding material. A cooling air passage 9 made of a material is formed.

However, due to the increase in speed and capacity of rotary electric machines in recent years, the centrifugal force increases due to an increase in the rotating speed, the rotor outer diameter, and the coil weight due to an increase in the coil cross section. Is increased, the cooling air passage 9 due to the coil end is decreased, and the cooling flow rate tends to decrease. Further, with the increase in capacity, it is necessary to greatly increase the required cooling air volume of the coil end, but with the current structure, it is not possible to expect a large increase in the cooling air volume, and the temperature of the coil end 4 rises. There was a tendency.

Since the end ring cooling holes 6 are arranged at a certain interval on the circumference, there is a tendency that a local excessive temperature rise occurs due to insufficient cooling air volume between the cooling holes. .

[0007]

As described above, as the rotating electric machine has a higher speed and a larger capacity, it is not possible to expect an increase in ventilation resistance and a large increase in cooling air volume due to a decrease in the cooling air passage 9 due to the coil end due to an increase in centrifugal force. Therefore, the result is that the amount of cooling air of the coil end 4 is relatively insufficient.

Therefore, the temperature rise of the coil end 4 as a whole or a local excessive temperature rise is caused, and there is a possibility that the insulation of the coil or the insulation forming the coil end 4 is deteriorated due to heat. is there. An object of the present invention is to solve these problems, and it is an object of the present invention to provide a rotor of a rotary electric machine that can improve ventilation cooling and prevent dielectric breakdown.

[0009]

SUMMARY OF THE INVENTION A rotor of a rotating electric machine according to the present invention comprises an iron core connected to a rotating shaft via rotor spokes, and an rotor core connected to rotor spokes at outer ends of the iron core in the axial direction. In a rotor of a rotating electric machine, comprising: an end ring, a coil housed in a slot provided in the iron core, and a binding material that couples coils axially protruding from the iron core in the vicinity of the end ring. The end ring is provided with a hole penetrating in the radial direction and provided at a predetermined interval, and a groove connecting the holes in the circumferential direction.

Further, the rotor of the rotating electric machine includes an iron core connected from a rotating shaft via rotor spokes, and an end ring connected to the rotor spokes via outer spacing pieces at axial end portions of the iron core. In a rotor of a rotary electric machine comprising a coil housed in a slot provided in an iron core and a binding material that couples coils axially protruding from the iron core in the vicinity of the end ring, the inner circumference of the end ring It is characterized in that it is provided with an annular disc connected to the side not on the iron core side, and a rib partitioning the space surrounded by the disc and the end ring in the axial direction.

Further, the end ring through hole portion is provided in the end ring and the outer spacing piece of the rotor of the rotating electric machine, the end ring through hole portion communicating axially with the refrigerant in the rotary electric machine is provided in the outer spacing piece. It is characterized in that it is provided with an outer-spacing one-side air passage for guiding the refrigerant that has flowed into the end ring through hole portion in the radial direction.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a main part of a rotor of a rotary electric machine according to a first embodiment of the present invention, and FIG. 2 is a view taken along the line AA in FIG. An iron core 2 is fixed by rotor spokes 1 from the outer peripheral portion of the rotating shaft. The iron core 2 is composed of thin iron plates laminated in the axial direction.
Further, the iron core 2 is provided with a slot portion, and the coil 3 is inserted therein. The coil 3 is particularly referred to as a coil end 4 at a position which protrudes from the iron core 2 and is supported by cylindrical end rings 5 provided at both ends of the iron core 2 due to the positional relationship with the iron core 2. The end ring 5 has a cooling hole portion 6 penetrating in the radial direction and provided at a predetermined interval, and a groove portion 6a connecting the hole portions 6 in the circumferential direction. Further, an outer spacing piece 7 is interposed between the iron core 2 and the end ring 5 in the rotation axis direction.

By binding a plurality of coil ends 4 that are successively folded over to each other, the binding member 8 is moved to its outer diameter by the centrifugal force generated by the rotation of the rotor so that the end portion of the coil 3 protruding from the iron core 2 is moved. Is being prevented. On the other hand, the cooling ventilation passage 9 ventilates the cooling medium in the rotary electric machine through the cooling holes 6 provided in the coil end 4 and the end ring 5 as a route. The coil end 4 is cooled by.

The rotor of the rotating electric machine according to the present invention is configured as described above, so that the cooling air from the cooling hole of the end ring is evenly distributed on the circumference through the communicating groove, and the coil end portion is locally distributed. It is possible to prevent a rise in temperature and prevent insulation damage of the coil end portion.

Next, a second embodiment of the rotor of the rotating electric machine of the present invention will be described with reference to FIG. FIG. 3 is a vertical cross-sectional view showing a main part of a rotor of a rotary electric machine according to a second embodiment of the present invention. The rotor of the rotating electric machine of the present invention includes an annular disc 10 that is closely coupled to the inner peripheral side of the end ring 5 on the side not on the iron core 2 side. Further, a rib 11 for axially partitioning a dense space surrounded by the circular plate 10 and the end ring 5 is provided.

The peripheral speed at the cooling air inlet is U ₁ , and the peripheral speed at the outlet is U.
Assuming ₂ , the basic wind pressure generated between the inlet and the outlet is expressed by the following equation (1). P = γ · U ₂ ² −U ₁ ² / 2g (1) where P: basic wind pressure generated at the coil end (m
mAg) γ: Specific weight of cooling air (kgf / m
³ ) g: acceleration of gravity (m / s ² ) U ₁ : inlet peripheral speed (m / s) U ₂ : outlet peripheral speed (m / s) Now, the outer diameter of the rotor that is the outlet of the cooling air D ₃ Is 6 m, the inner diameter D ₂ of the end ring 5 is 5.5 m, and the inner diameter D _{1 of the} disc 10 is 4 m.
When the basic wind pressure of the conventional structure generated between the rotor outer diameter and the inner diameter of the end ring is P ₀ , and the basic wind pressure of the structure of the present invention generated between the rotor outer side and the inner diameter of the disk is P ₁ , P ₀ and P And the ratio K is K = P ₁ / P ₀ = D ₃ ² −D ₁ ² / D ₃ ² −D ₂
² = 3.5.

Therefore, the basic air pressure can be easily increased and the cooling air flow can be increased by mounting the disc 10 and selecting the inner diameter thereof, so that an excessive temperature rise of the coil end portion can be prevented and the coil end portion can be prevented. It is possible to prevent insulation damage.

The rotor of the rotating electric machine according to the present invention has a disk inner diameter smaller than the inner diameter of the end ring as the inlet diameter of the cooling air, so that it is the basic wind pressure generated at the coil end portion which increases the ventilation amount. It is possible to increase the difference between the square of the peripheral speed of the rotor outer diameter and the square of the peripheral speed of the cooling air inlet diameter.

Therefore, the amount of cooling air at the coil end portion increases, an excessive temperature rise of the coil end portion can be prevented, and insulation damage of the coil end portion can be prevented. A third embodiment of the rotor of the rotary electric machine of the present invention will be described with reference to FIG. 12 is an axial through hole of the end ring 5, and 13 is a cover plate on the outer peripheral side of the outer spacing piece. The radial cooling holes 6 of the end ring 5 are not provided, and the outermost binding material 8 is wound over the entire length of the coil end 4. The other signals are the same as in FIG.

With the above-mentioned structure, the rotor of the rotating electric machine allows the cooling air pressurized between the end ring 5 and the disk 10 to pass through the through holes 12, between the outer spacing pieces, between the coils, and It is possible to prevent the temperature of the coil end portion from excessively rising and prevent the insulation damage of the coil end portion from being sent by cooling to the coil end end.

In the rotor of the rotating electric machine of the present invention, the centrifugal force is greatly increased due to the high speed and large capacity, the winding range of the binding material is over the entire coil end portion, and the cooling air passage outlet is formed at the outer diameter of the rotor. Although it is applied when it is no longer possible, the action of the disc inside the end ring can increase the basic wind pressure generated at the coil end portion that increases the ventilation volume, similarly to (action) in (Problem solving means 2). it can.

Therefore, the amount of cooling air increases due to the increase in the basic air pressure, and the ventilation path is from the axial through hole of the end song to the outer spacing pieces, to the coils to each other, and to the coil end ends. It is possible to prevent a rise in temperature and prevent insulation damage of the coil end portion.

[0023]

As described above, according to the present invention, the coil end of the large-capacity rotor having the coil end can be cooled with a necessary and sufficient amount of cooling air, so that the dielectric breakdown due to the thermal deterioration of the insulator can be prevented. Can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a rotor of a rotating electric machine showing a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 3 is a cross-sectional view of a main part of a rotor of a rotating electric machine showing a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part of a rotor of a rotary electric machine that shows a third embodiment of the present invention.

5 is a view taken along the line AA of FIG.

FIG. 6 is a vertical cross-sectional view showing a main part of a rotor of a conventional rotating electric machine.

FIG. 7 is a view on arrow AA of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotor spoke, 2 ... Iron core, 3 ... Coil, 4 ... Coil end, 5 ... End ring, 6 ... Cooling hole part, 6a ... Groove part, 7 ... Outer spacing piece, 8 ... Binder, 9 ... Binder cooling air Passage, 10 ... Disc, 11 ... Rib, 12 ... End ring through hole, 13 ... Outer spacing block.

Claims (3)

[Claims] 1. An iron core connected from a rotary shaft via rotor spokes, and an end ring connected to the rotor spokes via outer spacing pieces at axial end portions of the iron core,
A rotor of a rotary electric machine comprising: a coil housed in a slot portion provided in the iron core; and a binding member that couples the coils that axially protrude from the iron core in the vicinity of the end ring with each other. Holes that are provided in the end ring in the radial direction and that are provided at predetermined intervals,
A rotor of a rotating electric machine, comprising: a groove that connects the holes in the circumferential direction. 2. An iron core connected from a rotating shaft via rotor spokes, and an end ring connected to the rotor spokes via outer spacing pieces at axial end portions of the iron core,
A rotor of a rotary electric machine comprising: a coil housed in a slot portion provided in the iron core; and a binding member that couples the coils that axially protrude from the iron core in the vicinity of the end ring with each other. An annular disc joined to the inner peripheral side of the end ring on the side that is not the iron core side,
A rotor of a rotary electric machine, comprising: a rib that axially partitions a space surrounded by the disk and the end ring. 3. An end ring through hole provided in the outer ring and an end ring through hole that axially communicates the refrigerant in the rotary electric machine provided in the end ring and the outer space piece. The rotor of a rotary electric machine according to claim 2, further comprising: an outer space piece air passage that guides the refrigerant that has flowed into the ring through hole portion in a radial direction.