JPH0937523A - Manufacture of rotary machine rotor and permanent magnet fixing device for manufacture of rotary machine rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the breakage of permanent magnets which owing to the diameter increase caused by the heat expansion of a rotor main part. SOLUTION: A rotary machine rotor has a cylindrical rotor main part 3 and a plurality of permanent magnets 5 which are bonded by heating to the outer circumference of the rotor main part 3 with bonding layers made of solder 15 therebetween. First, the permanent magnets 5 are provided on the outer circumference of the rotor main part 3 with the solder 15 therebetween. At the same time, the permanent magnets 5 are pressed against the rotor main part 3 by coil springs 16. Then, under the heating, the bonding layers made of solder 15 are formed and, at the same time, accompanying the diameter increase of the rotor main part 3 which is caused by thermal expansion, the coil springs 16 are allowed to be displaced outward in the radial directions of the permanent magnets 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a rotor for a rotating machine, in particular, a cylindrical rotor body, and a plurality of permanent magnets heat-bonded to the outer peripheral surface of the rotor body via a bonding layer made of a brazing material. And a permanent magnet fixing device for manufacturing a rotor of a rotating machine. The rotating machine includes a motor and a generator.

[0002]

2. Description of the Related Art Conventionally, when a plurality of permanent magnets are joined to a steel rotor body to manufacture a rotor, a synthetic resin adhesive has been used (for example, see JP-A-7-79537).

The reason why the synthetic resin adhesive is used in this way is that permanent magnets, especially permanent magnets containing rare earth elements, are very brittle and therefore have poor machinability and, when exposed to high temperatures, have a metallic structure. Since it changes, the magnetic characteristics are affected accordingly. Therefore, when attaching the permanent magnet to the rotor body, the insertion structure, screwing,
This is because attachment means such as welding cannot be adopted.

[0004]

However, in the case of joining with a synthetic resin adhesive, there is a problem in that the joining strength remarkably decreases as the temperature of the permanent magnet rises and the joining strength varies greatly, which makes quality control difficult. is there.

Therefore, the present applicant has previously proposed a joining method which can improve the joining strength of a permanent magnet by using a brazing material made of a rare earth element-based alloy (for example, Japanese Patent Application No. 6-277027). See the specification and drawings).

When the rotor is manufactured by applying the above-mentioned joining method, in order to improve the production efficiency, first, all the permanent magnets are positioned and fixed to the outer peripheral surface of the rotor body through the brazing material, and then heated. It is desirable to adopt a method of forming each bonding layer from each brazing material below. In this case, as a simple method for positioning and fixing each permanent magnet, it is conceivable to press and fix the permanent magnet to the outer peripheral surface of the rotor body with a holding bolt.

However, if the pressing and fixing means for preventing the permanent magnets from being displaced outward in the radial direction is employed as described above, the thermal expansion coefficient of the rotor body is relatively large, so that the rotor body is heated under heating. The following problems occur as the diameter of the rotor body increases. (a) The permanent magnet may crack at the bolt contact point as the starting point, (b) Indeterminate amount of brazing filler metal in a liquid phase state or a solid-liquid coexistence state where a solid phase and a liquid phase coexist. And between the rotor main body, and as a result, the thickness of each bonding layer becomes non-uniform, resulting in a relatively large variation in the bonding strength of each permanent magnet. (C) The permanent magnets intervene through the brazing material in the above state. Slippery in the rotor axis direction, which causes the permanent magnet to be displaced in that direction.

In view of the above, it is an object of the present invention to provide the manufacturing method and the permanent magnet fixing device used in the manufacturing method, which can prevent the permanent magnet from cracking due to the diameter expansion of the rotor body. To do.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to a rotary machine having a cylindrical rotor body and a plurality of permanent magnets heat-bonded to the outer peripheral surface of the rotor body via a bonding layer made of a brazing material. In manufacturing a rotor, the permanent magnet is arranged on the outer peripheral surface of the rotor body via the brazing material, and the permanent magnet is pressed against the rotor body by a spring member, and then the brazing material is heated. With the formation of the bonding layer with the diameter expansion due to thermal expansion of the rotor body,
The spring member is allowed to displace the permanent magnet outward in the radial direction.

In this manufacturing method, since the permanent magnets are allowed to be displaced outward in the radial direction as the diameter of the rotor body is expanded, the permanent magnets are cracked due to the diameter expansion of the rotor body, and the permanent magnets are deformed. It is possible to avoid all kinds of problems such as variations in the bonding strength and displacement of the permanent magnets.

Further, the present invention is for manufacturing a rotor for a rotating machine, which comprises a cylindrical rotor body and a plurality of permanent magnets which are heat-bonded to the outer peripheral surface of the rotor body via a bonding layer made of a brazing material. A permanent magnet fixing device used for, wherein a cylindrical body surrounding the outer peripheral surface of the rotor body and the permanent magnet arranged on the outer peripheral surface of the rotor body via a brazing material are pressed against the rotor body. Therefore, a spring member disposed between the permanent magnet and the peripheral surface of the cylinder is provided, and a positioning means for positioning the spring member, and the pressing force of the spring member is due to thermal expansion of the rotor body. It is characterized in that it is set so as to allow displacement of the permanent magnets outward in the radial direction as the diameter increases.

According to this permanent magnet fixing device, it is possible to surely avoid the above-mentioned various problems.

[0013]

1 to 3, a rotor 1 for a motor as a rotating machine has a cylindrical rotor body 3 formed by laminating a plurality of circular steel plates 2 and an outer peripheral surface of the rotor body 3. It is provided with a plurality of permanent magnets 5 that are heat-bonded through a bonding layer 4 made of a brazing material. In this case, the coefficient of thermal expansion of the rotor body 3 is larger than that of each permanent magnet 5.
The spline shaft portion 6a of the rotor shaft 6 is press-fitted into the spline hole 3a existing at the center of the rotor body 3, and both opening edge portions of the spline hole 3a are fixed to the rotor shaft 6 via welded portions 7, respectively. Each of the permanent magnets 5 extends in the generatrix direction of the outer peripheral surface of the rotor body 3, and there is a space between the adjacent permanent magnets 5.

The rotor body 3 comprises a boss portion 8 having a spline hole 3a, a plurality of arm portions 9 extending radially from the outer peripheral surface of the boss portion 8, and a rim portion 10 connected to each arm portion 9. Become. A plurality of joining grooves 11 extending in the direction of the generatrix of the outer peripheral surface of the rim portion 10 are formed, and each permanent magnet 5 is joined to the rotor body 3 in each joining groove 11.
In the rim portion forming region a of each steel plate 2, slits extending from the outer peripheral surface of the region a to the radial middle portion are provided on both sides of each permanent magnet joint portion b provided with the notch-shaped recess 12 forming the joint groove 11. c is formed. In this case, one slit c exists between the adjacent permanent magnet joints b, and each slit c of each steel plate 2 is aligned in the direction of the generatrix of the outer peripheral surface of the rotor body 3.

As clearly shown in FIGS. 2 and 3, the rotor body 3
At least on both ends in the direction of the axis d, the permanent magnet joints b of the plurality of steel plates 2 are bent toward the outside of the rotor body 3 in the presence of the slits c existing on both sides thereof. At both permanent magnet joints b adjacent to each other
There is a gap e between them.

In the rotor 1, since the permanent magnet 5 is joined to the rotor body 3 through the joining layer 4 made of a brazing material, the rotor temperature is lowered by the operation of the motor and the joining strength of the synthetic resin adhesive is lowered. Even if the temperature is raised to, for example, 100 ° C., the bonding strength of each permanent magnet 5 is not impaired.

On the other hand, as the rotor temperature rises and falls, thermal stress concentrates on the outer circumference of both ends of the rotor body 3 in the axis d direction. According to the above configuration, since the gap e exists between the adjacent permanent magnet joints b of the plurality of steel plates 2 on the outer peripheral side of these both ends, expansion and contraction of the permanent magnet joints b is caused by the gap e. The permanent magnets 5 are absorbed, and the thermal stresses on the outer peripheral sides of the both ends are relieved, so that the permanent magnets 5 are not cracked. The axial direction 2 of the rotor body 3
Each permanent magnet joint b located at one end side from the equally divided position
And the permanent magnet joints b located on the other end side in the presence of the slit c in a direction in which they separate from each other, that is, the rotor body 3
By bending outward, a gap e may be formed between all adjacent permanent magnet joints b.

Further, each slit c of each steel plate 2 has a tendency to expand when the rotor shaft 6 is press-fitted into the spline hole 3a of the boss portion 8 and exerts an effect of relieving stress associated with the press-fitting.

As the permanent magnet 5, a permanent magnet containing a rare earth element such as an NdFeB system permanent magnet or an SmCo system permanent magnet is used.

The brazing material must exhibit a bonding force at a temperature T that does not affect the magnetic characteristics of the permanent magnet 5 containing the rare earth element, that is, T ≦ 650 ° C. Further, this bonding force is expressed by the diffusivity of the brazing filler metal when it is in a solid state under heating.
When the brazing material is in a liquid phase state or a solid-liquid coexisting state, it is necessary that the brazing material develops due to its wettability.

From this point of view, as the brazing filler metal, a highly active one composed of a rare earth element type alloy is used. In this rare earth element-based alloy, it is desirable that the volume fraction Vf of the amorphous phase is 50% ≦ Vf ≦ 100%. The reason is as follows. That is, the amorphous phase has a significantly high oxidation resistance because there is no grain boundary layer that serves as the starting point of oxidation, and the amount of oxides is very small, and the composition is uniform without segregation. This is because such characteristics are effective in improving the strength of the bonding layer 4.

In this case, the rare earth elements are Y, La and C.
e, Pr, Nd, Sm, Eu, Gd, Tb, Dy, H
At least one selected from o, Er, Tm, Yb and Lu is applicable, and they are used in the form of Mm (Misch metal) or Di (didymium) which is a single substance or a mixture. Further, the alloy element AE causes a eutectic reaction with a rare earth element, and the alloy element AE includes Cu, Al, and G.
a, Co, Fe, Ag, Ni, Au, Mn, Zn, P
At least one selected from d, Sn, Sb, Pb, Bi, Ge and In is applicable. The content of the alloy element AE is set to 5 atomic% ≦ AE ≦ 50 atomic%. When two or more kinds of alloying elements AE are contained, the total content thereof is 5 atom% ≦ AE ≦ 50 atom%. However, when the content of the alloy element AE is AE> 50 atomic%, the activity of the rare earth element-based alloy is impaired, while when AE <5 atomic%, it becomes difficult to secure a liquid phase in a solid-liquid coexisting state.

Table 1 shows examples of eutectic alloys in rare earth element-based alloys.

[0024]

[Table 1]

Sub- and hyper-eutectic crystals in rare earth element-based alloys
The following may be mentioned as alloys. Each chemistry
In the formula, the unit of numerical value is atomic% (this is the same below.
Same). (A) Nd₆₀Cu₄₀Alloy, Nd₇₅Cu_{twenty five}Alloy, Nd₈₀
Cu₂₀Alloy, Nd₅₀Cu ₅₀Alloy: Liquid phase generation temperature 520
℃ (See Fig. 4) (b) Sm₇₅Cu_{twenty five}Alloy, Sm₆₅Cu₃₅Alloy ... Liquid phase
Generation temperature 597 ° C (c) Nd₉₀Al_TenAlloy (liquid phase generation temperature 634 ° C),
Nd₈₀Co₂₀Alloy (liquid phase generation temperature 599 ℃), La₈₅G
a_FifteenAlloy (liquid phase generation temperature 550 ° C) Further, as a ternary alloy, Nd₆₅Fe_FiveCu₃₀alloy
(Liquid phase generation temperature 501 ° C) and Nd₇₀Cu_{twenty five}Al_FiveCombination
Gold (liquid phase generation temperature 474 ° C.) can be mentioned.

In manufacturing the rotor 1, the following method is adopted.

That is, as shown in FIG. 5, a steel plate 2 extends inward from the outer peripheral surface on both sides of each permanent magnet joint b having a notch-shaped recess 12, and in the illustrated example, to a radial middle portion. A rotor main body 3 having a rotor shaft 6 is prepared, which is formed by stacking a plurality of slits c each having an extending slit c.

The permanent magnet fixing device 13 shown in FIGS.
Prepare This device 13 includes a cylindrical body 14 having a circular cross section surrounding the outer peripheral surface of the rotor body 3 and each permanent magnet 5 arranged in each joint groove 11 on the outer peripheral surface of the rotor body 3 via a brazing material 15. A plurality of coil springs (spring members) 16 arranged between each permanent magnet 5 and the inner peripheral surface of the cylindrical body 14 so as to be pressed against the main body 3, and a plurality of positioning pins (for positioning each coil spring 16) Positioning means) 17.

The cylindrical body 14 is made of carbon steel, and the peripheral wall 18 thereof has a plurality of engaging holes 19 as shown in FIGS.
Is formed. In each of the engagement holes 19, two engagement holes 19 are arranged in the outer peripheral surface generatrix direction of the cylindrical body 14 at predetermined intervals.
Corresponds to each joint groove 11 of the rotor body 3. Each engagement hole 1
Reference numeral 9 includes a circular hole portion 20 and at least two, and in the embodiment, two notch portions 21 that open to the circular hole portion 20. Both notch portions 21 face each other and are present on the generatrix of the outer peripheral surface of the cylindrical body 14.

Each coil spring 16 is made of a nickel base alloy. As clearly shown in FIG. 8, two coil springs 16 are provided for each permanent magnet 5, and both coil springs 16 are provided.
One end of each is fixed to the holding plate 22 pressed against the permanent magnet 5. The space between the coil springs 16 is equal to that of the cylindrical body 1.
4 is equal to the interval between the two engaging holes 19 arranged in the generatrix direction of the outer peripheral surface. Each holding plate 22 is made of stainless steel.

Each positioning pin 17 is made of stainless steel, low carbon steel or the like, and as shown in FIG.
3, a pin-shaped main body 25 having a small diameter portion 24, at least two protruding portions on the outer peripheral surface of the large diameter portion 23 on the side of the small diameter portion 24, and in the embodiment, two pins protruding in mutually opposite directions. And a convex portion 26. The circular hole portion 20 of the engaging hole 19 allows the large diameter portion 23 to be fitted therein, and each notch portion 21.
Allow passage of each pin-shaped convex portion 26.

In fixing the permanent magnet 5 to the rotor main body 3, as shown in FIG. 6, the rotor main body 3 is covered with the cylindrical body 14 so that both ends of the rotor shaft 6 are supported by predetermined supporting members.

As shown in FIG. 6A, the cylindrical body 1
The two engaging holes 19 existing on the outer peripheral surface generatrix of No. 4 are made to face the joining groove 11 of the rotor body 3, and the engaging groove 11 and the cylindrical body 14 are provided.
A pressing plate 22 and two coil springs 16 whose one end is fixed to the pressing plate 22 are arranged between the pressing plate 22 and the inner peripheral surface. The pressing plate 22 is located in the joint groove 11, and the coil springs 16 are in a compressed state. This operation is repeated for all the remaining joining grooves 11.

As shown in FIGS. 6A and 6B, the pin-shaped body 25 of the positioning pin 17 is fitted into the circular hole portion 20 of the engaging hole 19 and the small diameter portion 24 is inserted into the coil spring 16. In addition, each pin-shaped protrusion 26 is passed through each notch 21 and engaged with the end of each coil spring 16. Then, while pressing the pin-shaped main body 25 to compress the coil spring 16, the pin-shaped main body 25 is rotated to cause the pin-shaped convex portions 26 and the notches 21 to be misaligned, and then the pin-shaped main body 25. When the pressing force on the
Is pressed against the inner peripheral surface of the cylindrical body 14 by the coil spring 16.
As a result, the positioning pins 17 are prevented from coming off from the cylindrical body 14, and the coil springs 16 are positioned. This operation is repeated for all the remaining coil springs 16.

As shown in FIG. 6C, the pressing plate 22 is moved radially outward against the pressing force of the two coil springs 16, and then the foil-shaped brazing material 15 is inserted into the joint groove 11. The permanent magnets 5 are superposed on each other, and then the pressing plate 22 is pressed against the permanent magnets 5 as shown in FIG. 6 (D) and FIG. 10, and the permanent magnets 5 are pressed against the rotor body 3 by the two coil springs 16. This operation is repeated for all the remaining permanent magnets 5.

In this case, the pressing force of one pair of coil springs 16 against one permanent magnet 5 allows the permanent magnet 5 to be displaced outward in the radial direction as the rotor body 3 expands in diameter due to thermal expansion. Is set.

The rotor body 3 to which the permanent magnets 5 are fixed in this way is installed in a vacuum heating furnace and the brazing material 15 is heated under heating.
In a liquid state, for example, and each permanent magnet 5 is bonded to the rotor body 3.

FIG. 11 shows the mechanism of the heat bonding. Before heating in FIG. 11A, the rotor body 3 and the permanent magnets 5 have the same length L ₁ . In addition, each coil spring 1
6 is in a compressed state and its length is L ₂ .

During heating shown in FIG. 11B, the rotor body 3 and the permanent magnets 5 are thermally expanded, and the thickness t of each steel plate 2 is increased.
₂ becomes thicker than that t ₁ before heating (t ₂ > t ₁ ),
Further, the length L ₃ of each permanent magnet 5 becomes longer than that L ₁ before heating (L ₃ > L ₁ ). Further, as the diameter of the rotor body 3 increases, each coil spring 16 contracts and its length L ₄ becomes shorter than that L ₂ before heating (L ₄ <L ₂ ). Radial outward displacement of the magnet 5 is allowed. As a result, the permanent magnets 5 are cracked due to the expanded diameter of the rotor body 3, the bonding strength is varied due to the uneven thickness of the bonding layer 4, and the permanent magnets 5 are displaced. All defects can be avoided.

After cooling as shown in FIG. 11 (c), each steel plate 2 of the rotor main body 3 having a large coefficient of thermal expansion contracts during cooling and is joined to each permanent magnet 5, so that the rotor main body 3 has the axis d direction 2 etc. Each permanent magnet joint b located on one end side with respect to the minute position f and each permanent magnet joint b located on the other end side
And, in the presence of the slit c, they are bent in directions away from each other with a virtual line connecting the ends of the adjacent slits c as a fold line g, that is, toward the outside of the rotor body 3. As a result, axis d
Since a gap e is formed between the permanent magnet joint portions b adjacent to each other in the direction, the permanent magnet joint portion b side of the rotor body 3 is constrained to be longer than the length L ₁ before heating and L ₅
> L ₁ . As a result, as compared with the case where the length on the permanent magnet joint portion b side of the rotor body 3 is substantially restored to the length L ₁ before heating as shown by the chain line in FIG. Since the generated thermal stress is relieved, it is possible to avoid cracking of the permanent magnet 5 due to the difference in thermal expansion coefficient between the rotor body 3 and each permanent magnet 5.

If the heating time h in the joining process is too long, the heating time h affects the characteristics of the rotor body 3 and the permanent magnets 5, so it is desirable that h ≦ 10 hours, from the viewpoint of improving productivity. Is h ≦ 1 hour.

Specific examples will be described below.

As shown in FIG. 5, the rotor body 3 has 12 notched recesses 12 and 12 slits c.
A plurality of circular cold-rolled steel plates each having a slit c of 0.3 mm in width and 10 mm in length and 0.4 mm in thickness.
Was prepared by stacking. In the rotor body 3, the outer diameter is 136 mm, the length is 100 mm, the number of the joining grooves 11 is 12, and the dimensions of each joining groove 11 are width 20 mm, depth 1 mm, and length 100 mm.

The permanent magnet fixing device 13 having the above structure was prepared. In this case, the cylinder 14 is JIS S
Made of 35C, outer diameter is 216mm, inner diameter is 202m
m, length 104 mm. Each coil spring 16 is composed of Inconel X750 and has a spring constant of 0.8 kgf / mm.
It is. Each holding plate 22 and each positioning pin 17 are JI
It is composed of S SUS304.

As the brazing material 15, Nd ₇₀ Cu ₂₅ Al is used.
₅ alloy, and the volume fraction Vf of the amorphous phase is Vf =
100%, length 104mm, width 20mm, thickness 100μ
m foil-like brazing material was prepared.

Further, as the permanent magnet 5, an NdFeB type permanent magnet having a length of 104 mm, a width of 20 mm and a thickness of 6 mm (manufactured by Sumitomo Special Metals Co., Ltd., trade name NEOMAX-28UH, Curie point 3)
10 ° C.) was prepared.

FIG. 12 shows changes in the coefficient of thermal expansion of the rotor body 3 and the NdFeB system permanent magnet 5 with respect to temperature. FIG.
From this, it can be seen that the difference between the coefficients of thermal expansion greatly increases as the temperature rises.

As shown in FIGS. 6 and 10, each permanent magnet 5 and the brazing material 15 were fixed to the rotor body 3 by the permanent magnet fixing device 13. In this case, the amount of bending of each coil spring 16 is 2 mm, the spring constant of each coil spring 16 is 0.8 kgf / mm as described above, and two coil springs 16 are provided for each permanent magnet 5. Since it is used, the pressing force (load) to each permanent magnet 5 is (0.8) at room temperature.
X2) x2 = 3.2 kgf. Thus, the permanent magnet 5
The rotor main body 3 to which the above components are fixed is installed in a vacuum heating furnace of 10 ⁻³ Torr, heating temperature T = 520 ° C., heating time h =
A joining process of heating for 20 minutes and then furnace cooling was performed to obtain a rotor 1 in which each permanent magnet 5 was joined to the rotor body 3 via the joining layer 4 as shown in FIGS.

In this rotor 1, a gap e exists between all the adjacent permanent magnet joints b, and the average length between the outer peripheral edges m of both permanent magnet joints b in the gap e is It was 0.04 mm. Moreover, the permanent magnets 5 were not cracked or displaced in the axial direction of the rotor.

Further, the thickness of each bonding layer 4 is about 30 μm ±.
It was 5 μm, and it was found that homogenization was achieved.

For comparison, the same joining process was performed under the same conditions as described above except that the permanent magnets 5 were pressed and fixed to the rotor body 3 by the holding bolts 27 as shown in FIG. The three permanent magnets 5 were cracked, and the two permanent magnets 5 were displaced in the axial direction of the rotor. Further, it was found that the thickness of the bonding layer 4 was 10 μm at the minimum and 50 μm at the maximum, and was non-uniform.

In order to investigate the heat resistance of the rotor 1, the rotor 1
Was placed in a heating furnace, heated at 150 ° C. for 1 hour, and then cooled at room temperature, and no crack was generated in each permanent magnet 5.

After the joining process, each permanent magnet 5 is magnetized.

FIG. 14 shows another example of the rotor 1. The rotor body 3 includes a boss portion 8, a plurality of arm portions 9 radially extending from the outer peripheral surface of the boss portion 8, and a rim portion 10 that is connected to each arm portion 9. The two adjacent slits c extend from the outer peripheral surface to the inner peripheral surface of the rim portion forming area a so as to sandwich the continuous portion k of the rim portion forming area a and the arm portion forming area h of the steel plate 2. ing. In this case, since the permanent magnet joints b of the steel plates 2 are bent from the folds g at the narrow connecting portions k, they are easier to bend than those of FIG. 5, and thus the gap e can be easily formed. Done.

[0055]

According to the present invention, by adopting the means specified as described above, cracking of permanent magnets, variation in bonding strength and permanent magnets due to diameter expansion due to thermal expansion of the rotor body occur. It is possible to provide a method for manufacturing a rotor for a rotating machine that can avoid all kinds of problems such as displacement.

Further, according to the present invention, it is possible to provide a permanent magnet fixing device which can surely realize the avoidance of the above-mentioned problems.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a rotor.

FIG. 2 is a partially enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 shows a main part of a Nd—Cu system phase diagram.

FIG. 5 is a fragmentary end view of a rotor body with a part thereof enlarged.

FIG. 6 is a fragmentary end view showing the relationship between the rotor body and the permanent magnet fixing device.

FIG. 7 is a front view of a cylindrical body.

FIG. 8 is a perspective view of a holding plate provided with a coil spring.

FIG. 9 is a perspective view of a positioning pin.

FIG. 10 is a sectional view taken along line 10-10 of FIG. 6;

FIG. 11 is an explanatory diagram showing a heating and joining mechanism.

FIG. 12 is a graph showing the relationship between temperature and coefficient of thermal expansion.

13 is a cross-sectional view of a main part of a comparative example, which corresponds to FIG.

FIG. 14 is a cross-sectional view showing another example of a partially enlarged rotor, corresponding to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotor 2 steel plate 3 rotor body 4 joining layer 5 permanent magnet 13 permanent magnet fixing device 14 cylindrical body 15 brazing material 16 coil spring (spring member) 17 positioning pin (positioning means) 18 peripheral wall 20 circular hole 21 notch 25 Pin-shaped body 26 Pin-shaped convex part

Claims (6)

[Claims] 1. A cylindrical rotor body (3) and a plurality of permanent magnets (5) heat bonded to the outer peripheral surface of the rotor body (3) via a bonding layer (4) made of a brazing material (15). In manufacturing a rotor (1) for a rotating machine, the permanent magnet (5) is arranged on the outer peripheral surface of the rotor body (3) via the brazing material (15), and the permanent magnet is The rotor body (3) is provided with (5) by a spring member (16).
The bonding layer (4) is formed from the brazing filler metal (15) under pressure and then to the rotor body (3).
As the diameter of the spring member (16) expands due to thermal expansion,
A method of manufacturing a rotor for a rotating machine, comprising allowing the permanent magnets (5) to be displaced outward in the radial direction. 2. The method for manufacturing a rotor for a rotating machine according to claim 1, wherein the brazing material (15) is made of a rare earth element alloy. 3. In the brazing material (15), the rare earth element RE is Y, La, Ce, Pr, Nd, Sm, Eu, G.
At least one selected from d, Tb, Dy, Ho, Er, Tm, Yb and Lu, and the alloy element AE is C
u, Al, Ga, Co, Fe, Ag, Ni, Au, M
2. At least one selected from n, Zn, Pd, Sn, Sb, Pb, Bi, Ge and In, and the content of the alloying element AE is 5 atomic% ≦ AE ≦ 50 atomic%. Alternatively, the method for manufacturing a rotor for a rotating machine according to the item 2. 4. The permanent magnet is a permanent magnet (5) containing a rare earth element, and the rotor body (3) is formed by laminating a plurality of steel plates (2).
Alternatively, the method for manufacturing a rotor for a rotating machine according to the item 3. 5. A cylindrical rotor body (3) and a plurality of permanent magnets (5) heat bonded to the outer peripheral surface of the rotor body (3) via a bonding layer (4) made of a brazing material (15). A permanent magnet fixing device (13) used for manufacturing a rotor (1) for a rotating machine, comprising: a cylindrical body (14) surrounding an outer peripheral surface of the rotor body (3); In order to press the permanent magnet (5) arranged on the outer peripheral surface of the main body (3) via the brazing material (15) against the rotor main body (3), the permanent magnet (5) and the tubular body (14). ) A spring member (16) is provided between the spring member (16) and the inner peripheral surface, and a positioning means (17) for positioning the spring member (16). As the rotor body (3) expands due to thermal expansion, the permanent magnet (5)
A permanent magnet fixing device for manufacturing a rotor of a rotating machine, wherein the permanent magnet fixing device is set so as to allow a radial outward displacement of the rotor. 6. The spring member is a coil spring (16), and the positioning means is a positioning pin (17), which protrudes from the pin-shaped body (25) and the outer peripheral surface of the pin-shaped body (25). At least two pin-shaped protrusions (2
6), the pin-shaped body (25) is inserted into the hole (20) of the cylindrical peripheral wall (18) and inserted into the coil spring (16), and each pin-shaped protrusion ( 26) is
The cylinder is disengaged with each notch (21) that opens in the hole (20) and allows each pin-shaped protrusion (26) to pass therethrough, and engages with the end of the coil spring (16). The permanent magnet fixing device for manufacturing a rotor of a rotating machine according to claim 5, which is pressed against the inner peripheral surface of the body (14).