JPH06315246A - Rotary electric machine with liquid-cooled jacket - Google Patents

Abstract

(57) [Summary] [Purpose] A liquid-cooled hollow coil is reliably positioned over the buoyancy and liquid injection force at the center of the wall thickness of the base material of the outer casing to be molded by casting or die casting or injection molding. [Structure] A rotating electric machine includes brackets 1a and 1b and a bearing 2.
a, 2b, a shaft 3, a rotor 4, a stator 5, and a frame 6. The frame 6 to be die-cast includes a liquid-cooled hollow coil 11 made of a copper pipe and having a spiral shape.
Inside, a plurality of rod-shaped fixing pieces 12 having a protruding portion 12a at the end thereof are arranged continuously in the axial direction. The liquid cooling hollow coil 11 is fixed to the fixed piece 12 by brazing 13 or the like. The liquid-cooled hollow coil 11 and the fixed piece 12 are embedded in the base material of the frame 6 at the time of modeling. At this time, the liquid cooling hollow coil 11 is positioned with respect to the die casting mold by causing the inner circumference of the fixed piece 12 to follow the outer circumference of the inner die of the die casting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool electric motor for keeping a temperature of an outer jacket constant and a constant thermal expansion, and a rotating electric machine exposed to a high temperature atmosphere or having a large heat generation.
The present invention relates to a rotating electric machine provided with a liquid-cooled jacket in which a liquid-cooled hollow coil is embedded so that a coolant such as water flows through a frame or a bracket that is a jacket for improving cooling.

[0002]

2. Description of the Related Art There is a rotating electric machine having a liquid-cooled jacket which has a double-layered jacket and engraves a water channel on the outside of an inner member and joins the outer member via a gasket to improve cooling. This structure requires two members, requires machining of the joining surfaces, and requires gasket reliability and maintenance. Therefore, there is a rotary electric machine that includes a liquid-cooled outer casing that improves cooling by embedding a liquid-cooled hollow coil in a base material of the outer casing formed by casting or die casting an aluminum alloy or injection molding a synthetic resin.

[0003]

The structure in which the liquid-cooled hollow coil is embedded in the base material of the outer casing formed by casting, die-casting or injection molding described above has a structure in which the liquid-cooled hollow coil is embedded in the single outer casing. The structure is simple, and the reliability and maintainability are excellent. However, it is difficult to position the liquid cooling hollow coil in the center of the wall thickness of the jacket, and if it is deviated, the liquid cooling hollow coil is exposed on the surface of the jacket and is unsightly. Is cut and a hole is opened. Also,
The liquid-cooled hollow coil has sufficient rigidity, and even if both ends are correctly positioned, the buoyancy of the liquid-cooled hollow coil in the base material and the liquid injection force of the base material are strongly received during modeling, and there is also springback due to heat. The middle part of the liquid-cooled hollow coil is also deviated, and the liquid-cooled hollow coil may be exposed on the surface of the jacket and may be unsightly or may have holes formed by machining.

An object of the present invention is to reliably position a liquid-cooled hollow coil by overcoming buoyancy and liquid pouring force at the center of the wall thickness of a base material of an outer cover formed by casting, die casting, injection molding or the like. An object of the present invention is to provide a rotating electric machine including a liquid-cooled type outer casing.

[0005]

According to another aspect of the present invention, there is provided a rotary electric machine having a liquid-cooled jacket, which comprises a plurality of fixing pieces axially continuous to the outside or inside of a liquid-cooled hollow coil having a spiral shape. And the liquid-cooled hollow coil is fixed to the fixed piece, and the liquid-cooled hollow coil and the fixed piece are embedded in a base material of a cylindrical jacket.

A rotary electric machine provided with the liquid-cooled jacket of the invention 2 is
A plurality of fixed pieces that are continuous in the radial direction are arranged outside or inside a plate-shaped liquid-cooled hollow coil that is spiral, and the liquid-cooled hollow coil is fixed to this fixed piece. The fixing piece is embedded in a base material of a plate-shaped jacket.
Invention 3 is the invention 1 or 2 in which the fixing piece is formed into a rod shape, and invention 4 is the invention 1 or 2 in which the fixing piece has a quarter arc or more on one side of the liquid cooling hollow coil. A fourth aspect of the present invention is to provide a convex portion that surrounds the other side and opens the other side. In the first or second aspect of the present invention, the fixed piece includes a convex portion that surrounds at least one side of the liquid cooling hollow coil. The convex portion and the fixing piece are formed from a continuous strip plate.

A sixth aspect of the present invention is the invention according to the first, second, third, fourth or fifth aspect, wherein at least one of the embedded fixing pieces has a protruding portion protruding outside the base material of the jacket. .

[0008]

According to the invention 1 or 2, even if the fixing piece is exposed on the surface of the jacket or is cut by machining, the liquid-cooled hollow coil is the meat of the base material of the molded jacket. It is located in the center of the thickness firmly against the buoyancy of the coil and the liquid injection force of the die casting, and there is no possibility that the liquid cooled hollow coil is exposed on the surface of the jacket and is unsightly or pierced by machining.

According to the invention 3, the liquid-cooled hollow coil is fixed to the fixing piece having a simple rod shape, and according to the invention 4, the liquid-cooled hollow coil has its own spring force and a convex portion surrounding a quarter arc or more. According to the fifth aspect of the invention, the liquid-cooled hollow coil is fixed to the fixed piece by the spring force of the fixed piece and the convex portion surrounding a quarter arc or more. According to the sixth aspect of the present invention, the protrusion is fitted into the recess of the molding die or the like, and the positioning of the liquid-cooled hollow coil becomes more reliable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a half sectional view including a rotational sectional view of the first embodiment, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a main part corresponding to FIG. A sectional view and FIG. 4 are sectional views of a main part corresponding to FIG. 1 of the third embodiment. In FIGS. 1 and 2, a rotor 4 is fixed to a shaft 3 supported by brackets 1a and 1b via bearings 2a and 2b, and a stator 5 is arranged on the outer circumference of the rotor 4 with a gap therebetween. The stator 5 is fixed to a frame 6 to which the brackets 1a and 1b are attached, and the frame 6 is die-cast and molded with an aluminum alloy or the like.

A feature of the first embodiment is that, in the frame 6, a spirally formed tubular liquid-cooled hollow coil 11 is formed inside the liquid-cooled hollow coil 11, and the projection 12a is formed continuously at the end in the axial direction.
A plurality of rod-shaped fixing pieces 12 having the above are arranged, and the liquid cooling hollow coil 11 is fixed to the fixing pieces 12 by brazing 13. Then, the liquid-cooled hollow coil 11 and the fixed piece 12 are embedded in the base material of the frame 6 at the time of modeling. At the time of modeling, the inner periphery of the fixed piece 12 is aligned with the outer periphery of the inner die of the die casting, and the protrusion 12a is fitted into the recess of the inner die,
The fixed piece 12, and therefore the liquid-cooled hollow coil 11 to which the fixed piece 12 is fixed, is positioned with respect to the die casting mold.

According to this structure, the liquid cooling hollow coil 11 is formed into the base material of the frame 6 even if the fixing piece 12 is exposed on the surface of the frame 6 or is cut by machining. It is located in the center of the wall thickness of the coil without failing to overcome the buoyancy of the coil and the liquid injection force of the die casting, and the liquid cooling hollow coil 11 may be exposed on the surface of the frame 6 and may be unsightly or machined to cause a hole. Not at all.

Although the respective pitches of the liquid-cooled hollow coils 11 are fixed to the fixed piece 12 by the brazing 13, etc., they may be arranged at a plurality of pitches. In the present invention, the spiral liquid-cooled hollow coil includes one in which one turn of the coil is wound in a cross section perpendicular to the axis and is raised to the next turn. Instead of arranging the fixing pieces 12 inside the liquid-cooled hollow coil 11, they may be arranged outside or on both sides. The protrusion 12a is not essential if the liquid-cooled hollow coil 11 to which the fixing piece 12 is fixed is fixed to the die casting mold with appropriate strength before shaping. The thickness of the liquid-cooled hollow coil 11 is sufficient,
The liquid cooling hollow coil 11 and the base material may be materials of the same system, for example, by passing cooling air through 1. Instead of die casting, ordinary casting may be used, or synthetic resin injection molding may be used.

In the second embodiment shown in FIG. 3, the fixing piece 22 is used.
Is provided with a convex portion 22a surrounding one or more quarter arcs on one side of the liquid-cooled hollow coil 11 and opening the other side.
The pitch of a and the free-form pitch of the liquid cooling hollow coil 11 are changed, and the liquid cooling hollow coil 11 is fixed to the fixing piece 22 by the spring force of the liquid cooling hollow coil 11. As shown in the figure, the outer fixing piece 32 having the one-pitch offset convex portion 32a is attached to the convex portion 32a.
You may use together so that it may be press-fitted. The fixing pieces 22 and 32 are suitable for pressing a plate. In Example 3 shown in FIG. 4, the fixing pieces 42 are provided on both sides of the liquid cooling hollow coil 11.
A convex portion 42a surrounding at least a / 4 arc is provided.
And the fixing piece 42 are formed from a continuous strip plate. The liquid cooling hollow coil 11 is fixed to the fixed piece 42 by the spring force of the fixed piece 42. The ears 42b may be formed to adjust the positioning, and the convex portion 42a may be formed in the liquid cooling hollow coil 11 as in the second embodiment.
It is also possible to enclose at least one quarter arc of at least one side of the above and open the other side.

The above-mentioned embodiment is a technique relating to the frame of a cylindrical air gap type rotary electric machine, but it can also be applied to a bracket of an axial gap type rotary electric machine. Further, it can be applied to a bracket of a cylindrical air gap type rotating electric machine or a frame of an axial direction air gap type rotating electric machine. At this time, it is needless to say that the structure is such that a plurality of radially fixed fixing pieces are arranged outside or inside the plate-shaped liquid-cooled hollow coil in a spiral shape, and the liquid pieces are attached to the fixing pieces. A cold hollow coil is fixed, and the liquid cooled hollow coil and the fixing piece are embedded in a base material of a plate-shaped jacket.

[0016]

According to these inventions, the liquid-cooled hollow coil can be used as a base material for the molded casing even if the fixing piece is exposed on the surface of the casing or is cut by machining. It is positioned in the center of the wall thickness to overcome the buoyancy of the coil and the liquid injection force of the die casting, and there is no possibility that the liquid-cooled hollow coil will be exposed on the surface of the jacket and it will be unsightly or punctured by machining. There is an effect.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view including a rotation-illustrated cross-sectional view of a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a main part corresponding to FIG. 1 of the second embodiment.

FIG. 4 is a sectional view of an essential part corresponding to FIG. 1 of Example 3;

[Explanation of symbols]

 3 shaft 4 rotor 5 stator 6 frame 11 liquid cooling hollow coil 12 fixed piece 12a protrusion 13 brazing 22 fixed piece 22a convex portion 32 fixed piece 32a convex portion 42 fixed piece 42a convex portion

Claims (6)

[Claims] 1. A plurality of fixing pieces axially continuous are arranged on the outside or inside of a liquid-cooled hollow coil having a spiral shape.
A rotary electric machine having a liquid-cooled jacket, wherein the liquid-cooled hollow coil is fixed to the fixed piece, and the liquid-cooled hollow coil and the fixed piece are embedded in a base material of a tubular jacket. 2. A plurality of radially fixed fixing pieces are arranged on the outer side or the inner side of a plate-shaped liquid-cooled hollow coil having a spiral shape,
A rotary electric machine having a liquid-cooled jacket, wherein the liquid-cooled hollow coil is fixed to the fixed piece, and the liquid-cooled hollow coil and the fixed piece are embedded in a base material of a plate-shaped jacket. 3. A rotary electric machine equipped with the liquid-cooled jacket according to claim 1 or 2, wherein the fixing piece is rod-shaped. 4. A rotary electric machine provided with the liquid-cooled jacket according to claim 1, wherein the fixed piece surrounds at least one-quarter arc of one side of the liquid-cooled hollow coil and opens the other side of the fixed piece. A rotary electric machine having a liquid-cooled jacket, which is provided with a portion. 5. A rotating electric machine comprising the liquid-cooled jacket according to claim 1, wherein the fixed piece is provided with a convex portion surrounding at least one quarter arc of at least one side of the liquid-cooled hollow coil, A rotary electric machine having a liquid-cooled jacket, wherein the convex portion and the fixing piece are formed from a continuous strip plate. 6. A rotating electric machine comprising the liquid-cooled jacket according to claim 1, 2, 3, 4 or 5, wherein at least one fixed piece of the embedded fixed piece is provided outside the base material of the jacket. A rotating electric machine having a liquid-cooled jacket, which is provided with a protruding portion.