JP2001078376A - Magnet rotor for dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnet rotor for a dynamo-electric machine, capable of reducing the number of parts and assembling man-hours. SOLUTION: This magnet rotor for a dynamo-electric machine, involving a rotor yoke 11 formed into a tubular shape and formed with a plurality of dovetail grooves 11c at the outer periphery part thereof so as to be spaced at a prescribed angle and permanent magnets 13 tapered on both the side surfaces thereof with the part nearer to the one end of the depth direction thereof as a dovetail, which is fitted in the respective dovetail grooves 11c, so that the respective permanent magnets 13 are attached to the rotor yoke 11. Spacers 15 constituted of nonmagnetic material are inserted in between a plurality of magnets 13 to fill clearances between the respective magnets, a first ring 16 and a second ring 17 are fitted onto the outer periphery of the rotor yoke, and the magnets 13 are positioned in the axial direction. A magnet case 14, made of a nonmagnetic materials is attached so as to cover the magnets 13, spacers 15, and the first and second rings 16, 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet rotor used for a rotating electric machine such as a magnet type AC generator or a brushless motor, and more particularly to a magnet rotor suitable for use in a magnet generator mounted on an internal combustion engine. It is.

[0002]

2. Description of the Related Art In a rotating electric machine such as a magnet type alternator or a brushless motor, if it is necessary to reduce the weight of the rotor and reduce its moment of inertia, the rotor is arranged inside the stator. In many cases, there is an adduction type structure that rotates inside the stator.

[0003] In particular, in a racing internal combustion engine driven vehicle, when the ignition device for the internal combustion engine is operated with the output of the magnet type alternator attached to the internal combustion engine, the acceleration performance and deceleration performance of the engine are not impaired. For this purpose, it is necessary to minimize the moment of inertia of the rotor of the magnet type alternator attached to the internal combustion engine.

[0004] Therefore, in this type of conventional magnet rotor,
A structure in which a permanent magnet and a magnetic pole piece are mounted on the outer periphery of the boss member using a cylindrical boss member fitted and mounted coaxially to the tip of a rotating shaft of the internal combustion engine has been employed. In this type of conventional magnet rotor,
On the outer periphery of the boss member, a plurality of magnet mounting portions arranged at equal angular intervals in the circumferential direction are provided, and plate-like permanent magnets are respectively arranged on these magnet mounting portions, and magnetic pole pieces are superimposed on the surface of each permanent magnet. The superposed body of the permanent magnet and the pole piece was fastened to the boss member with a screw. Further, in order to prevent the magnetic pole piece and the permanent magnet from jumping outward due to centrifugal force at the time of high-speed rotation of the internal combustion engine, the outer peripheral surface of the boss member, the side surface of the permanent magnet, the end of the magnetic pole piece, Was provided with a mold part made of aluminum covering the aluminum.

However, in the magnet rotor having such a structure, when vibration is applied to the magnet rotor from the internal combustion engine, the screws may become loose and the mounting strength of the pole piece and the permanent magnet may be reduced. .

In a conventional magnet rotor, a boss member, in which a permanent magnet and a magnetic pole piece are fixed by screws, is inserted into an injection mold, and a mold of aluminum is injected into the mold by injection of aluminum hot water. Because it is necessary to form a part
There has been a problem that the temperature of the permanent magnet is increased by the hot water of aluminum and the magnet is demagnetized.

In order to avoid the above-mentioned problems and to improve the workability at the time of assembling, the present applicant has previously filed Japanese Patent Application No.
No. 332172 proposes a magnet rotor as shown in FIGS. 8A and 8B show the structure of the magnet rotor. FIG. 8A is a sectional view taken along line XX of FIG. 8B, and FIG. 8B is a line YY of FIG. It is sectional drawing.
9A and 9B show a boss member used in the magnet rotor, wherein FIG. 9A is a front view of the boss member, and FIG.
It is a -Z line sectional view. FIG. 10 is a perspective view of a magnet holding member used in the magnet rotor.

This proposed magnet rotor comprises a boss member (rotor yoke) 1 made of a ferromagnetic material such as iron, a plurality of magnet holding members 5, a plurality of permanent magnets 3, and a boss member of each permanent magnet 3. It is composed of two positioning rings 6 and 7 for performing one axial positioning and a magnet cover 4.

The boss member 1 is formed so as to have a substantially cylindrical shape as a whole. An enlarged diameter portion 1a is provided on the outer peripheral side at one end in the axial direction. A tapered hole 1b for fitting the shaft is formed. A plurality (eight in the illustrated example) of dovetail grooves 1c, 1c,... Are provided at equal angular intervals on the outer peripheral surface of the boss member 1, and on the outer peripheral portion of the boss member 1 near one end in the axial direction,
An outer flange portion 1d having a smaller diameter than the enlarged diameter portion 1a is formed. Each dovetail groove 1 c is a groove having a dovetail shape in cross section, and is provided such that one end in the longitudinal direction is open to the other end side of the boss member 1.

In each dovetail groove 1c of the boss member 1, an independent magnet holding member 5 is fitted and supported for each dovetail groove 1c. Each magnet holding member 5 is made of a high-strength aluminum material or the like, and protrudes radially outward of the boss member 1 and a dovetail 5a fitted into the corresponding dovetail groove 1c as shown in FIG. The dovetail 5a is integrally fixed with the magnet holding portion 5b, and the dovetail 5a is fitted into the dovetail groove 1c of the boss member 1 and fixed to the boss member 1.

On both side surfaces of the magnet holding portion 5b of each magnet holding member 5, tapered portions inclined in such a manner as to protrude toward the magnet holding portion 5b of the adjacent magnet holding members toward the outside in the radial direction of the boss member 1 are provided. 5b1 is provided, and a dovetail groove is also formed between the plurality of magnet holding members 5, 5,... Arranged in the circumferential direction of the boss member 1.

The magnet holding portion 5b of the adjacent magnet holding member 5
Between them, a plate-shaped permanent magnet 3 magnetized in the radial direction of the boss member 1 is inserted. A tapered portion 3a1 inclined in the same direction as the tapered portion 5b1 of the magnet holding portion 5b is provided on the side surface of each permanent magnet 3 in contact with the side surface of the magnet holding portion 5b of the magnet holding member 5.
Are provided so that each permanent magnet 3 has an ant shape as a whole, and the tapered portion 5 of each magnet holding member is provided.
By contact between the b1 and the tapered portion 3a1 of the permanent magnet, each of the permanent magnets 3 is held so as not to protrude outward in the radial direction of the boss member 1.

In order to position each permanent magnet 3 in the axial direction of the boss member 1, two positioning rings 6, 7 made of a high-strength aluminum material or the like are brought into contact with the outer end faces of the magnet holding portions 5b, 5b. .. Are fitted to both ends of the magnet holding members 5, 5,... In the axial direction. The positioning ring 6 farther from the distal end of the boss member 1 is positioned by contacting the outer flange 1 d of the boss member 1. The end surface of the positioning ring 7 on the tip end side of the boss member 1 has a magnet holding member 5.
Is formed so as to coincide with the front end face of.

A non-magnetic magnet cover 4 is fitted around the outer periphery of the permanent magnet 3 and the magnet holding member 5 arranged in the circumferential direction of the boss member 1 and fixed to the boss member 1. The non-magnetic magnet cover 4 is formed by forming a thin plate of a non-magnetic material (a metal material other than a ferromagnetic material) such as stainless steel or aluminum into an annular or cylindrical shape. The nonmagnetic magnet cover 4 has inner flanges 4a and 4b at one end and the other end in the axial direction, respectively. The inner flange 4a at one end of the magnet cover 4 and the inner flange at the other end are provided. The portion 4b is fixed to the boss member 1 in a state where the portion 4b is in contact with the outer flange portion 1d of the boss member 1 and the end face on the other end side (tip side) of the boss member 1 from outside. At least one of the inner flange portions 4a and 4b at both ends of the magnet cover 4
After being fitted to the outer periphery of the magnet holding member 5, it is formed by seaming or the like.

If the magnet rotor is constructed as described above, the permanent magnet 3 can be firmly fixed to the boss member 1 without using a pole piece and without using a screw or an aluminum mold part. A strong magnet rotor having high mechanical strength against centrifugal force and having no place to be loosened by vibration can be obtained. Further, since a mold portion is not provided unlike the conventional magnet rotor, it is possible to avoid a problem that the permanent magnet is exposed to a high temperature during manufacturing and the magnet is demagnetized.

The magnet rotor shown in FIGS. 8 to 10 can be made lightweight, and is suitable as a rotor of a magnet generator to be mounted on a racing internal combustion engine. It can also be used as a rotor of a rotating electric machine.

[0017]

In the proposed magnet rotor shown in FIGS. 8 to 10, in order to fix the permanent magnet 3 to the outer periphery of the boss member, the same number of the magnet holding members 5 as the permanent magnets 3 are used.
Need. Moreover, when assembling the magnet rotor, the operation of fitting each magnet holding member 5 to the dovetail groove on the outer periphery of the boss member and the fitting of the permanent magnet 3 to the dovetail groove formed between the magnet holding members 5 are performed. Work and need. Therefore, when the number of poles of the magnet rotor is increased, the number of parts is increased, and the number of assembling steps is increased, so that there is a problem that it takes time to assemble the rotor.

Further, in the magnet rotors already proposed, each tapered portion of the magnet holding member, the dovetail groove on the outer periphery of the boss member, and the tapered portions on both side surfaces of the permanent magnet are not machined with sufficiently high precision. Since the magnet rotor cannot be assembled, many parts need to be machined with high accuracy, and the machining cost of parts cannot be avoided.

An object of the present invention is to provide a magnet rotor for a rotating electric machine which can reduce the number of parts and the number of assembling steps, reduce the number of parts requiring high processing accuracy, and reduce the manufacturing cost. To provide.

[0020]

According to the present invention, there is provided a magnet rotor for a rotating electrical machine, wherein the rotor yoke is formed in a cylindrical shape and has a plurality of dovetail grooves formed in an outer peripheral portion thereof and extending in the axial direction at predetermined angular intervals. A first ring disposed at a position near one end in the axial direction of the rotor yoke in a state fitted to the outer periphery of the rotor yoke, and a dovetail shape having at least one end portion in the thickness direction fitted into the dovetail groove; And one end in the thickness direction having the shape of the dovetail is directly fitted into each of the plurality of dovetail grooves, and one end in the longitudinal direction is brought into contact with the first ring. A plurality of permanent magnets, a second ring fitted to the outer periphery of the rotor yoke on the other end side in the axial direction, and abutted on the other end of each of the plurality of permanent magnets in the longitudinal direction thereof; Consisting of the first ring A structure in which a plurality of permanent magnets and the second ring and the cover so formed with fitted to a cylindrical magnet case the rotor yoke.

In order to secure the magnet, it is preferable to apply an adhesive to the outer peripheral portion of the rotor yoke located between the plurality of permanent magnets.

The rotor yoke is made of a ferromagnetic material such as iron. Also, to reduce the amount of leakage magnetic flux flowing through the rotor yoke from both sides in the width direction of each permanent magnet,
The depth of each dovetail groove formed on the outer peripheral portion of the rotor yoke is set sufficiently smaller than the thickness of each permanent magnet.

When the magnet rotor for a rotating electrical machine is configured as described above, the dovetail portion on one end side in the thickness direction of each permanent magnet is directly fitted into the dovetail groove formed on the outer peripheral portion of the rotor yoke. Thus, the magnet can be fixed, so that the mounting of the magnet can be simplified.

If an adhesive is applied to the outer periphery of the rotor yoke located between the plurality of permanent magnets, the permanent magnets can be securely fixed.

Further, the first ring, the plurality of permanent magnets and the second
When the magnet case that covers the ring is fitted to the rotor yoke, it is possible to prevent the magnet from being hit by an object and being damaged when the magnet rotor is assembled to the rotating electric machine.

As described above, according to the present invention, the permanent magnet can be attached to the rotor yoke without using a magnet holding member as in the magnet rotor of the previously proposed method, so that the number of parts and the number of assembling steps can be reduced. Can be.

According to the present invention, the part functioning as a dovetail of each permanent magnet and the dovetail groove may be machined with a predetermined machining accuracy, and the number of parts requiring high machining accuracy can be reduced. The processing cost of the parts can be reduced, the number of parts and the number of assembling steps can be reduced, and the cost of the magnet rotor can be reduced.

Instead of applying the adhesive to the outer periphery of the rotor yoke located between the plurality of permanent magnets as described above,
A structure in which a spacer made of a nonmagnetic material formed so as to fill each gap is inserted into each gap between the plurality of permanent magnets and each spacer is pressed into the gap between the magnets by a magnet case is adopted. Thus, an effect of securely fixing the magnet can be obtained.

In the above-mentioned magnet rotor, a flange is formed on the outer periphery of one end in the axial direction of the rotor yoke, and the first ring and the concave portion which are fitted to one and the other of the outer flange of the rotor yoke, respectively. It is preferable that the first ring is positioned and fixed to the rotor yoke by fitting the concave portion and the convex portion. Similarly, one and the other of the second ring and the rotor yoke are provided with recesses and protrusions which are fitted to each other, and the second ring is positioned and fixed to the rotor yoke by fitting the recesses and the protrusions. Is preferred. With such a structure, the first
In addition, the rotation of the second ring can be prevented.

[0030]

1A and 1B show an example of a configuration in which the present invention is applied to a magnet rotor of a magnet type alternator, and FIG. 1A shows FIG. 1B is a sectional view taken along line XX, and FIG. 1B is a sectional view taken along line YY in FIG.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 2 is a front view of a rotor yoke used in the magnet rotor of the present embodiment, and FIG. 2B is a cross-sectional view taken along the line Z-Z in FIG. 4 to 7
3 is a perspective view showing a permanent magnet, a spacer, a first ring, and a second ring among other components used in the magnet rotor of the present example.

In the example shown in FIGS. 1A and 1B, a rotor yoke 11 formed in a cylindrical shape, a plurality of permanent magnets 13 arranged at equal angular intervals on the outer periphery of the rotor yoke, The first magnets are disposed at positions near one end in the axial direction and at the other end of the rotor yoke in a state of being fitted to the outer periphery, and are respectively in contact with one end and the other end of the permanent magnet 13 in the axial direction of the rotor yoke. Ring 16
And a second ring 17, a plurality of spacers 15 made of a non-magnetic material formed to fill the gaps between the plurality of permanent magnets, a first ring 16 and a plurality of permanent magnets 13 A magnet rotor is formed by the cylindrical magnet case 14 formed so as to cover the plurality of spacers 15 and the second ring 17 and fitted to the rotor yoke 11.

The rotor yoke 11 is formed of a ferromagnetic material such as iron so as to have a substantially cylindrical shape as a whole.
As shown in FIGS. 3A and 3B, an enlarged diameter portion 11a is provided on the outer peripheral side of one end (base end) of the rotor yoke 11 in the axial direction. A tapered hole 1 for fitting a rotating shaft of an internal combustion engine (not shown) is provided inside the rotor yoke 11.
1b is formed along the axial direction. A plurality of (eight in the illustrated example) dovetail grooves 11c extending in the axial direction at predetermined angular intervals are provided on the outer peripheral portion of the rotor yoke 11 in a state of being opened on the outer peripheral side of the rotor yoke. A flange portion 11d having a smaller diameter than the enlarged diameter portion 11a is formed on the outer peripheral portion near one end of the flange.

Each dovetail groove 11c is formed by a groove having a dovetail shape in cross section, and is provided such that one end in the axial direction is open to the other end (front end) of the rotor yoke 11. The bottom surface of the dovetail groove 11c is curved at a predetermined curvature so as to form a part of a cylindrical surface having a center on the central axis of the rotor yoke 11. The other end of the rotor yoke 11 has a small-diameter portion 11e smaller in diameter than the bottom of the dovetail groove 11c.
(See FIG. 3B). Concave portions 11d1 and 11d1 that are open outward in the radial direction are formed by notching a part of the flange 11d inward at a symmetric position 180 degrees away from the outer periphery of the flange 11d. In the symmetrical position of the outer periphery of the small diameter portion 11e, a part of the small diameter portion 11e is cut inward to form a concave portion 11e opened radially outward.
1, 11e1 are formed.

A plurality (eight in the illustrated example) of permanent magnets 13, 13,... Are mounted on a plurality of dovetail grooves 11c, 11c,. Each of the permanent magnets 13 is made of, for example, a rare earth magnet, and as shown in FIG. 4, is formed in a plate shape having an arc-shaped cross section and is magnetized in the thickness direction. Each permanent magnet 13
Side surfaces 13a, 13a in the width direction of the rotor yoke 11
The permanent magnet 13 has a tapered surface inclined in such a direction that the width of the magnet is gradually reduced toward the outside in the radial direction. It is fitted in the groove 11c.

As shown in FIG. 2, the angle θ between the tapered portions 13a on both sides of each permanent magnet 13 is selected to be, for example, 30 °. Also, the side surfaces 13a, 13a of each permanent magnet 13
In order to prevent the leakage magnetic flux flowing through the rotor yoke 11 from becoming large, the depth h of each dovetail groove 11c is
The thickness is set sufficiently smaller than the thickness t of each permanent magnet 13. The radial depth of each dovetail groove 11c is, for example, 0.2
０．３0.3 mm. Each permanent magnet 13 has an end in the thickness direction used as a dovetail attached to the rotor yoke 11.
It is attached by being inserted into each dovetail groove 11c from the opening of each dovetail groove 11c provided on the tip side of the.

The spacer 15 used in this example is:
The cross section is formed of a non-magnetic material such as an insulating resin so as to have a sector shape. As shown in FIGS. 2 and 5,
Both side surfaces in the width direction of the spacer 15 are adjacent permanent magnets 1.
3 has a tapered portion 15a inclined at the same angle as the side surface (tapered surface) 13a, so that a gap between the plurality of permanent magnets 13 is filled by a spacer 15 inserted between the magnets. . As described above, when the spacer 15 is inserted between the magnets, a series of the permanent magnets 13,
13,... Can be surely fixed.

The first ring 16 is formed of a non-magnetic material such as a high-strength aluminum material. As shown in FIG. 6, the first ring 16 has an annular portion 16a and one side surface of the annular portion 16a in the axial direction. A pair of protrusions 16b protruding from the symmetric position to one side in the axial direction, and the annular portion 16a is
1. The outer diameter of the annular portion 16a of the first ring 16 is set substantially equal to the outer diameter of the plurality of permanent magnets 13 fitted to the rotor yoke 11.

The projections 16b, 16b of the first ring 16
Is a concave portion 11d provided in a flange portion 11d of the rotor yoke.
1, 11d1 are formed in a shape to be fitted to each other.
One side surface of the first ring 16 in the axial direction is in contact with the flange 11d of the rotor yoke, and the other side surface of the first ring 16 in the axial direction is brought into contact with the side surface of each permanent magnet 13 in the axial direction. Can be The first ring 16 positions one end of each permanent magnet 13 in the axial direction of the rotor yoke. The fitting between the convex portion 16b on the first ring 16 side and the concave portion 11d1 on the rotor yoke 11 side prevents rotation between the first ring 16 and the rotor yoke 11.

The second ring 17 is also made of a non-magnetic material such as a high-strength aluminum material. As shown in FIG. 7, the second ring 17 is inward from the symmetric position of the annular portion 17a and the inner peripheral surface of the annular portion 17a. And a pair of protruding portions 17b protruding toward. The annular portion 17a is fitted around the small diameter portion 11e of the rotor yoke 11, and the outer diameter of the annular portion 17a is
Are set to be substantially equal to the outer diameters of the plurality of permanent magnets 13 fitted in. The convex portion 17b is fitted into a concave portion 11e1 provided in the small diameter portion 11e of the rotor yoke. The second ring 17 positions each of the permanent magnets 13 on the other end side in the axial direction of the rotor yoke, and the second ring 17 engages with the convex portion 17b on the second ring 17 side and the concave portion 11e1 on the rotor yoke 11 side to form the second permanent magnet 13. The rotation of the second ring 17 is prevented.

The first ring 1 is provided on the outer periphery of the rotor yoke 11.
6, the plurality of permanent magnets 13, and the second ring 17, the end surface of the second ring 17 on the tip side of the rotor yoke 11 is flush with the end surface of the small diameter portion 11 e of the rotor yoke. An axial dimension (thickness dimension) of the second ring 17 is set so as to be located.

The non-magnetic magnet case 14 is made of a thin plate made of a non-magnetic material (a metal material other than a ferromagnetic material) such as stainless steel or aluminum and formed into an annular or cylindrical shape. The magnet case 14
The inner flange portion 14 is provided at one end and the other end in the axial direction.
a, 14b, and the inner flange 14a on one end and the inner flange 14b on the other end of the magnet case 14 are provided on the outer periphery of the rotor yoke 11 and the other end of the rotor yoke 11 (front end, respectively). ) Is fixed to the rotor yoke 11 in a state of contacting the end face from outside.

When assembling the above-described magnet rotor, first, the first ring 16 is fitted to the outer peripheral portion of the rotor yoke 11, and the first ring 16 is inserted into the concave portion 11d1 of the flange portion 11d of the rotor yoke.
The first ring 16 is brought into contact with the flange 11d in a state where the convex portion 16b of the ring 16 is fitted. Next, the dovetail portion at the end of each permanent magnet 13 in the thickness direction is attached to the rotor yoke 1.
1 is fitted into the corresponding dovetail groove 11c, and each permanent magnet 13
The one end face in the axial direction is brought into contact with the first ring 16 to position each permanent magnet in the axial direction. Next, the second ring 17 is fitted to the outer periphery of the small diameter portion 11e of the rotor yoke 11, the convex portion 17b of the second ring 17 is fitted to the concave portion 11e1 of the small diameter portion 11e, and the second ring 17 is The permanent magnet 13 is brought into contact with the other end face in the axial direction.

Next, a spacer 15 is inserted into each gap between the plurality of permanent magnets 13 to fill the gap between the magnets. In this case, in order to prevent the inserted spacers 15 from dropping during the assembly operation, the spacers 1
An adhesive may be applied to the surfaces where the permanent magnets 5 and the respective permanent magnets 13 are in contact with each other.

Finally, the magnet case 14 is fitted.
An inner flange portion 14b is formed in advance on the other end side (the end side of the rotor yoke 11) of the cylindrical tube portion of the magnet case 14, and the second ring 17 and the plurality of permanent magnets 13 and the plurality of spacers 15 are formed. The assembly with the first ring 16 is inserted from one end side of the cylindrical portion of the magnet case 14 into the inside thereof, and the inner flange portion 14b is brought into contact with the end surface on the tip end side of the rotor yoke 11 from the outside. In this state, one end side of the cylindrical portion of the magnet case 14 is seamed to form the inner flange portion 14a so as to cover the end surface of the flange portion 11d of the rotor yoke 11 from the outside. When the magnet case 14 is mounted, the spacers 15 are held in a state where the spacers 15 are pressed into the gaps between the magnets 13, 13,..., And each spacer fills the gap between the magnets.
Can be mechanically integrated through a spacer to increase the strength of the magnet rotor.

When the magnet rotor is constructed as described above, each permanent magnet 13 is formed simply by fitting a portion of one end in the thickness direction of each permanent magnet 13 into a dovetail groove 11c formed on the outer periphery of the rotor yoke 11. Can be fixed to the rotor yoke 11, so that like the magnet rotor already proposed,
There is no need for a magnet holding member machined with high precision.

The spacer 15 may have any shape as long as it is inserted between the magnets and substantially fills the gap between the magnets.
It is not necessary to have high dimensional accuracy like the dovetails and dovetail grooves that fit together.

In the above-described magnet rotor, since the plurality of permanent magnets 13 and the plurality of spacers 15 are fixed to the rotor yoke 11 in a state covered by the non-magnetic magnet case 14, the magnet rotor is incorporated in the rotating electric machine. In this case, it is possible to prevent the object from hitting the outer surface of the permanent magnet 13 and being damaged.

When a rare earth magnet is used as the permanent magnet 13, if the magnet is exposed to the outside air, the deterioration of the magnet may proceed at an early stage.
Is provided, the permanent magnet 13 can be shielded from the outside air, so that deterioration of the magnet can be suppressed.

Also, in the above-described magnet rotor, the first and second
Since the rings 16 and 17 are fitted on the outer periphery of the rotor yoke 11 and are in contact with both ends of each permanent magnet in the axial direction, the permanent magnets 13 can be reliably positioned in the axial direction of the rotor yoke 11. Can be.

In particular, a non-magnetic magnet case 14 having inner flanges 14a and 14b is provided at one end and the other end in the axial direction, respectively. The inner flange 14a at one end and the inner flange 14b at the other end are provided. The magnet case 14 is fixed to the rotor yoke 11 in a state where the magnet case 14 is in contact with the flange 11d of the rotor yoke 11 and the end face on the other end side of the rotor yoke 11, respectively. Can be more firmly fixed to the rotor yoke 11.

In the examples shown in FIGS. 1A, 1B and 2, in order to secure the plurality of permanent magnets 13 to the outer periphery of the rotor yoke 11, the space between the plurality of permanent magnets 13 is secured. A spacer 15 made of a non-magnetic material formed so as to fill the gap is inserted into each gap, but without using the spacer 15, the outer periphery of the rotor yoke 11 located between the plurality of permanent magnets 13, 13,. A high-viscosity adhesive may be applied to the portion, and the plurality of permanent magnets 13 and the outer peripheral portion of the rotor yoke 11 and the magnet case 14 may be bonded to each other with the adhesive. In this case, the first ring 16, the plurality of permanent magnets 13, and the second ring 17 are fitted around the outer circumference of the rotor yoke 11, and the gaps between the plurality of permanent magnets 13, 13,. After filling the gap 18 with the adhesive 18, the magnet case 14 is divided into the first ring 16, the plurality of permanent magnets 13, and the second ring 1.
7, and the plurality of permanent magnets 13, the rotor yoke 11, and the magnet case 14 are fixed to each other.

With such a structure, since a plurality of spacers 15 are not required, the number of parts constituting the magnet rotor can be further reduced, and the cost can be reduced.

In the above example, the whole of both side surfaces in the width direction of each of the permanent magnets is tapered. However, each of the permanent magnets 13 may have a dovetail shape at least on one end side in the thickness direction. It is sufficient that the side surface of the portion other than the portion used as the dovetail of each permanent magnet is not tapered.

[0054]

As described above, in the magnet rotor for a rotating electric machine according to the present invention, one end portion in the thickness direction of each of the plurality of permanent magnets is formed so as to exhibit an ant shape. The magnet is fixed to the rotor yoke by directly fitting the portion having the shape of the circle into the dovetail groove formed on the outer peripheral portion of the rotor yoke, so that the dovetail portion of the permanent magnet and the dovetail groove portion of the rotor yoke are fixed. What is necessary is just to process with the processing precision, and the magnet holding member which requires high dimensional precision like the magnet rotor of the proposal is unnecessary. Therefore,
The number of parts and the number of assembly steps can be reduced, and the processing of the parts can be facilitated to reduce the cost.

[Brief description of the drawings]

FIGS. 1A and 1B show an example of a configuration in which the present invention is applied to a magnet rotor of a magnet type AC generator.
(A) is a sectional view taken along the line XX of (B), and (B) is a Y view of (A).
FIG. 4 is a sectional view taken along line -Y.

FIG. 2 is an enlarged view of a main part of FIG.

3A is a front view of a rotor yoke used in the magnet rotor shown in FIG. 1, and FIG. 3B is a cross-sectional view taken along line ZZ of FIG.

FIG. 4 is a perspective view of a permanent magnet used in the magnet rotor shown in FIG.

FIG. 5 is a perspective view of a spacer used in the magnet rotor of FIG. 1;

FIG. 6 is a perspective view of a first ring used in the magnet rotor of FIG. 1;

FIG. 7 is a perspective view of a second ring used in the magnet rotor of FIG. 1;

8A and 8B show a conventional magnet rotor, wherein FIG. 8A is a sectional view taken along line XX of FIG. 8B, and FIG. 8B is a line YY of FIG. It is sectional drawing.

9A is a front view of a boss member used as a rotor yoke in a conventional magnet rotor, and FIG. 9B is a cross-sectional view taken along the line Z-Z in FIG. 9A.

FIG. 10 is a perspective view of a magnet holding member used in a conventional magnet rotor.

[Explanation of symbols]

11: rotor yoke, 11c: dovetail groove, 11d: flange,
11d1, 11e1 recess, 13 permanent magnet, 14 magnet case, 14a, 14b inner flange, 15 spacer, 15a taper, 16 first ring, 17 second ring.

Claims (3)

[Claims] 1. A rotor yoke having a plurality of dovetail grooves formed in a cylindrical shape and extending in an axial direction at predetermined angular intervals in an outer peripheral portion, and an axial direction of the rotor yoke in a state fitted to an outer periphery of the rotor yoke. A first ring disposed at a position near one end of the ant, and a thickness at least one end side in the thickness direction is formed so as to exhibit a shape of an ant fitted into the dovetail groove. A plurality of plate-like permanent magnets, one end of which is directly fitted into each of the plurality of dovetail grooves, and one end of each of which in the longitudinal direction abuts on the first ring; A second ring fitted to the outer periphery of the other end side in the axial direction and abutting on the other end in the longitudinal direction of each of the plurality of permanent magnets; Ring and multiple permanent magnets A cylindrical magnet case formed so as to cover the second ring and fitted to the rotor yoke, and an adhesive is applied to an outer peripheral portion of the rotor yoke located between the plurality of permanent magnets. Magnet rotor for rotating electric machines. 2. A rotor yoke having a plurality of dovetail grooves formed in a cylindrical shape and extending in an axial direction at predetermined angular intervals in an outer peripheral portion, and an axial direction of the rotor yoke in a state fitted to an outer periphery of the rotor yoke. A first ring disposed at a position near one end of the ant, and a thickness at least one end side in the thickness direction is formed so as to exhibit a shape of an ant fitted into the dovetail groove. A plurality of plate-like permanent magnets, one end of which is directly fitted into each of the plurality of dovetail grooves, and one end of each of which in the longitudinal direction abuts on the first ring; A second ring fitted to the outer periphery of the other end side in the axial direction and abutting on the other end in the longitudinal direction of each of the plurality of permanent magnets; Ring and multiple permanent magnets A cylindrical magnet case formed so as to cover the second ring and fitted to the rotor yoke; and a non-magnetic member formed to fill each gap between the plurality of permanent magnets. A magnet rotor for a rotating electric machine into which a spacer made of a magnetic material is inserted. 3. A flange portion is formed on the outer periphery of one end of the rotor yoke in the axial direction, and a concave portion and a convex portion are fitted to one and the other of the outer ring portion of the first ring and the rotor yoke. Is provided, and the first ring is positioned and fixed to the rotor yoke by fitting the concave portion and the convex portion, and the concave portion is fitted to one and the other of the second ring and the rotor yoke. 3. The magnet rotor for a rotating electrical machine according to claim 1, wherein a protrusion is provided, and the second ring is positioned and fixed to the rotor yoke by fitting the recess and the protrusion. 4.