JP2002027691A - Magnet rotor for dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a permanent magnet to a boss member, without having to use a dovetail and a dovetail groove. SOLUTION: This magnet rotor has a tubular boss member 1, which has a plurality of U grooves 2 standing apart in a line in the circumferential direction and opening in its peripheral face and each U groove 2, of which has parallel rising faces 2a parallel with each other, a bottom face 2b blocking the bottom of these parallel rising faces 2a, and circular grooves 2c opposed, in the middle in the rising direction of each parallel rising face 2a, to each other in the longitudinal direction of the grooves 2, a plurality of magnet retaining members 3 each of which has a lock member 3a fitting in each U groove 2 and having a circular bulge 3b fitted in each circular groove 2c for slip stoppage and a magnet holder 3c projecting in the diametrical direction around the boss member 1 in a body with the lock member 3a, and a permanent magnet 4 which is retained between adjacent magnet holders 3c.

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 Conventional magnetic rotors for rotary electric machines of this type are disclosed in Japanese Patent Application Nos. 10-332172 and 11-249.
As proposed in Japanese Patent No. 699, a structure in which a permanent magnet is fixed to the outer periphery of the boss member by using a dovetail of the magnet holding member and a dovetail groove of the boss member.

According to the magnet rotor for a rotating electrical machine in which the permanent magnet is fixed to the outer periphery of the boss member using the dovetail and the dovetail groove, the permanent magnet is fixed to the outer periphery of the boss member by screws even when vibration is applied. In this case, there is an advantage that there is no problem that the mounting strength of the permanent magnet is reduced due to the loosening of the screw which occurs in such a case.

[0004]

However, in the structure in which the permanent magnet is fixed to the outer periphery of the boss member using the dovetail and the dovetail groove, it takes a lot of time to form the dovetail and a bite is required to machine the dovetail groove. Due to the special shape, it is difficult to obtain, and the unit price of the tool is very high compared to ordinary tools, and the size of the dovetail groove is very small, so the tool itself becomes small and does not last long There is a problem. Further, the extremely tight dimensional tolerance (clearance) between the dovetail groove and the spacer to be inserted therein also makes the tool last longer.

An object of the present invention is to provide a magnet rotor for a rotating electric machine that can fix a permanent magnet to the outer periphery of a boss member without using a dovetail and a dovetail groove.

Another object of the present invention is to provide a magnet rotor for a rotating electric machine which can machine a groove without using a special cutting tool.

Another object of the present invention is to provide a magnet rotor for a rotating electrical machine that can reduce the processing time.

Another object of the present invention is to provide a magnet rotor for a rotating electrical machine that can reduce the cost.

[0009]

A magnet rotor for a rotating electrical machine according to the present invention is made of a ferromagnetic material, has a hole for fitting a rotating shaft along an axis, and is circumferentially spaced. A plurality of U-grooves arranged in a row on the outer peripheral surface,
The grooves are formed so as to be parallel to each other, parallel to each other, along the longitudinal direction of the U-shaped groove, in the middle of the parallel rising surfaces, and in the rising direction of each of the parallel rising surfaces. A cylindrical boss member having a shape having an arcuate groove formed therein, and an arc-shaped convex portion fitted into each U-shaped groove of the boss member so as to prevent the boss member from coming off. A locking member and a magnet holding portion that is integral with the locking member and that protrudes radially on the outer periphery of the boss member are provided. Each locking member is fitted into a corresponding U-shaped groove of the boss member, and A plurality of fixed magnet holding members, and a plurality of plate-shaped permanent magnets sandwiched and held between the magnet holding portions of adjacent magnet holding members and magnetized in the radial direction of the boss member are provided. are doing.
In the magnet holding portion of each magnet holding member, on both side surfaces facing the magnet holding portion of each of the magnet holding members on both sides, the magnet holding portion side of each of the magnet holding members on both sides is gradually increased toward the outside in the radial direction of the boss member. The tapered portion is provided with a taper in a direction of projecting to the outside. On the side surface of each permanent magnet that is in contact with the side surface of the magnet holding portion of each adjacent magnet holding member, a tapered portion inclined in the same direction as the tapered portion of the magnet holding portion is provided.

Further, the magnet rotor for a rotating electrical machine according to the present invention is made of a ferromagnetic material, has holes along the axis for fitting the rotating shaft, and is arranged at intervals in the circumferential direction. A plurality of U-grooves are opened in the outer peripheral surface, and the U-grooves have parallel rising surfaces parallel to each other, a bottom surface closing the bottom of these parallel rising surfaces, and a midway in the rising direction of each parallel rising surface. A cylindrical boss member having an arc-shaped groove formed so as to face each other along the longitudinal direction of the U-groove; and an arc-shaped member fitted into each U-groove of the boss member. Each locking member has a locking member fitted with an arc-shaped convex portion in the groove to prevent the locking member from coming off, and a magnet holding portion integrated with the locking member and protruding radially on the outer periphery of the boss member. A plurality of magnet holding members fitted into corresponding U-grooves of the boss member and fixed to the boss member; A plurality of plate-shaped permanent magnets that are held and held between the magnet holding portions of the magnet holding member to be magnetized in the radial direction of the boss member, and a plurality of permanent magnets that are arranged in the outer circumferential direction of the boss member. A non-magnetic magnet cover fixed to the boss member by being formed in an annular shape so as to cover the outer peripheral surface of the magnet holding member and being fitted to the outer periphery of a group of juxtaposed permanent magnets and magnet holding members. I have it. In the magnet holding portions of the respective magnet holding members, on both side surfaces facing the magnet holding portions of the respective adjacent magnet holding members, the magnet holding portions of the adjacent magnet holding members of the respective adjacent magnet holding members are gradually arranged toward the outside in the radial direction of the boss member. The tapered portion is provided with a taper in a direction of projecting to the outside. A tapered portion that is inclined in the same direction as the tapered portion of the magnet holding portion is provided on the side surface of each permanent magnet that is in contact with the side surface of the magnet holding portion of each adjacent magnet holding member.

In these cases, the magnet holding member may be made of a non-magnetic material such as aluminum (a metal material other than a ferromagnetic material) or a resin material.

In the magnet rotor for a rotating electric machine having such a structure, the groove used for fixing the permanent magnet to the outer periphery of the boss member is formed of a U-shaped groove. It has a shape having a bottom surface closing the bottom of the parallel rising surface, and arcuate grooves formed facing each other along the longitudinal direction of the U groove in the middle of the rising direction of each parallel rising surface. Therefore, the portion consisting of the parallel rising surface and the bottom surface can be processed by, for example, an end mill, and the arc-shaped groove of each parallel rising surface can be processed by, for example, a ball end mill. Can be fixed to the outer periphery of the device. End mills and ball end mills are commercially available, and grooves can be easily formed without using a special cutting tool. Further, the U-groove used in the present invention can be easily processed, so that the processing time and the cost can be reduced. Furthermore, since the U-shaped groove has a simple shape, the processing accuracy is improved, the adhesion to the magnet holding member is improved, and a structure capable of sufficiently withstanding the high-speed rotation of the engine can be obtained.

In the magnet rotor for a rotating electrical machine according to the present invention, two positioning rings for positioning the boss member of each permanent magnet in the axial direction are provided on the outer periphery of the boss member. It is arranged in contact with both end faces in the direction. The positioning ring farther from the tip of the boss member is positioned in contact with the positioning portion of the boss member. The dimensions of the positioning ring on the distal end side of the boss member are set so that the end surface thereof matches the distal end surface of the boss member.

With such a structure, each permanent magnet can be reliably positioned at a predetermined position in the axial direction of the boss member.

Further, in the magnet rotor for a rotating electric machine according to the present invention, the non-magnetic magnet cover has inner flange portions at one end and the other end in the axial direction, respectively. The magnet cover is fixed to the boss member in a state where the flange portion and the inner flange portion on the other end are in contact with the positioning portion on the outer periphery of the boss member and the end face on the other end side of the boss member from the outside.

With this structure, each magnet holding member and each permanent magnet can be more firmly fixed to the boss member.

[0017]

1 to 9 show an embodiment in which a magnet rotor for a rotating electric machine according to the present invention is applied to a magnet rotor of a magnet type AC generator. FIG. 2 is a cross-sectional view taken along the line AOA of FIG. 1, FIG. 3 is an enlarged view in the X direction with the magnet cover removed in FIG. 1, and FIG. Front view of a boss member used in this example,
5 is a longitudinal sectional view of a boss member used in the present example, FIG. 6 is a partially enlarged arrow view in the Y direction of FIG. 4, FIG. 7 is a partially enlarged front view of the boss member shown in FIG. 4, and FIG. FIG. 9 is an enlarged front view of a main part of the magnet rotor of this embodiment with the magnet cover removed.

The magnet rotor of this embodiment has a cylindrical boss member 1 made of a ferromagnetic material, and one end (base end) of the boss member 1.
Is provided with an enlarged diameter portion 1a on the outer peripheral side, and a tapered hole 1b for fitting a rotating shaft of an internal combustion engine (not shown) is provided on the inner side.
Are formed along the axial direction. On the outer peripheral surface of the boss member 1, a plurality (eight in the illustrated example) of U-grooves 2 are provided so as to be opened at equal angular intervals, and on the outer peripheral portion of the boss member 1 near one end in the axial direction, An outer flange portion 1c having a smaller diameter than the enlarged diameter portion 1a is formed. Each of the U-grooves 2 has a parallel rising surface 2a parallel to each other, a bottom surface 2b covering the bottom of the parallel rising surface 2a, and a midway in the rising direction of each parallel rising surface 2a along the longitudinal direction of the U-groove 2. And have arc-shaped grooves 2c formed so as to face each other.

In each U groove 2 of the boss member 1, two magnet holding members 3 independent of each U groove 2 are fitted and supported. Each magnet holding member 3 is made of a high-strength aluminum material or the like, and has a locking member 3a fitted into the corresponding U-groove 2 and protrudes along both side surfaces of the locking member 3a to form the U-groove 2. An arc-shaped convex portion 3b fitted in the arc-shaped groove 2c to prevent the locking member 3a from coming off, and a magnet holding portion 3c which is integrated with the locking member 3a and protrudes radially outward from the outer periphery of the boss member 1, respectively. And is fixed to the boss member 1. The magnet holding portion 3c of each magnet holding member 3 is provided so as to protrude at an intermediate portion in the longitudinal direction of the locking member 3a so that magnetic flux does not pass through the magnet holding portion 3c. On both side surfaces of the magnet holding portions 3c of the magnet holding members 3 adjacent to each other on the outer periphery of the boss member 1, the magnet holding members 3 are gradually stretched toward the magnet holding portions 3c of the neighboring magnet holding members 3 toward the outside in the radial direction of the boss member 1. Each of the tapered portions 3c1 is provided with a taper in a protruding direction.

The magnet holding portion 3c of the adjacent magnet holding member 3
Between them, a plate-like permanent magnet 4 magnetized in the radial direction of the boss member 1 is sandwiched and held. On the side surface of each permanent magnet 4 in contact with the side surface of the magnet holding portion 3c of each adjacent magnet holding member 3 in this manner, a tapered portion 4a1 inclined in the same direction as the tapered portion 3c1 of the magnet holding portion 3c is shown in FIG. The tapered portions 3c1 and 4a1 are provided in the same manner as shown.
, Each permanent magnet 4 is held so as not to escape in the radial direction of the boss member 1.

On the outer periphery of the boss member 1, two positioning rings 5, 6 for positioning the boss member 1 of each permanent magnet 4 in the axial direction are provided on both end surfaces of the boss member 1 of each permanent magnet 4 in the axial direction. They are arranged in contact. In this case, the positioning ring 5 farther from the tip of the boss member 1 is positioned in contact with the outer flange portion 1c as the positioning portion of the boss member 1. The size of the positioning ring 6 on the tip end side of the boss member 1 is set so that the end face thereof coincides with the tip end face of the boss member 1. These positioning rings 5, 6 are formed of a high-strength aluminum material or the like.

A non-magnetic magnet cover 7 is fitted on the outer periphery of the plurality of permanent magnets 4 and the plurality of magnet holding members 3 arranged in the outer peripheral direction of the boss member 1 and fixed to the boss member 1. The non-magnetic magnet cover 7 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 non-magnetic magnet cover 7 has inner flanges 7a and 7b at one end and the other end in the axial direction, respectively. The inner flange 7a at one end of the magnet cover 7 and the inner flange at the other end are provided. 7b are outer flange portions 1c as positioning portions on the outer periphery of the boss member 1, respectively.
Further, the boss member 1 is fixed to the boss member 1 in a state in which the boss member 1 is in contact with an end surface on the other end side (tip side) from outside.

In the magnet rotor having such a structure, the magnet holding member 3 is divided into a plurality of parts corresponding to the respective U grooves 2 of the boss member 1 and has an independent structure. The locking members 3a are independently fitted into the respective U-grooves 2 of the boss member 1, so that the locking members 3a of the magnet holding member 3 and the U-grooves 2 of the boss member 1 are raised as in the prior art. The fitting between the locking member 3a and the U-groove 2 can be easily performed without making it accurate.

In each U groove 2 on the outer periphery of the boss member 1,
Since the locking members 3a of the magnet holding members 3 do not need to be fitted at the same time, the workability at the time of assembly can be improved as compared with the related art.

Further, each permanent magnet 4 has, for example, a locking member 3a of a magnet holding member 3 fitted into one U-groove 2 on the outer periphery of the boss member 1, and a permanent member 3c1 of the magnet holding portion 3c. One of the tapered portions 4a1 of the magnet 4 is applied, and the locking member 3a of the next magnet holding member 3 is fitted into the adjacent U groove 2. At this time, the permanent magnet 4 is attached to the tapered portion 3c1 of the magnet holding member 3. A method of holding the permanent magnet 4 by contacting the other tapered portion 4a1, or fitting the locking members 3a of the magnet holding members 3 in the respective U grooves 2 on the outer periphery of the boss member 1 first. Every
A method such as inserting the permanent magnets 4 while applying the tapered portions 4a1 of the permanent magnets 4 to the tapered portions 3c1 between the magnet holding portions 3c of the adjacent magnet holding members 3, respectively.
The mounting work of each of the permanent magnets 4 can be performed more easily than in the conventional case, and the workability of mounting each of the permanent magnets 4 can be improved as compared with the related art.

Further, the non-magnetic magnet cover 7 is fitted over the outer peripheral surfaces of the plurality of permanent magnets 4 and the plurality of magnet holding members 3 which are arranged in the outer peripheral direction of the boss member 1, and is fixed to the boss member 1. When the magnet rotator is incorporated in a rotating electric machine, it is possible to prevent an object from hitting the outer surface of the permanent magnet 4 to damage the magnet 4. Further, when a rare earth magnet is used as the permanent magnet 4, if the magnet 4 is in contact with the outside air, the deterioration of the magnet 4 may proceed at an early stage. However, when the magnet cover 7 is provided, the permanent magnet 4 is shut off from the outside air. Because you can
The magnet 4 can be prevented from being deteriorated early.

Each permanent magnet 4 is provided on the outer periphery of the boss member 1.
The two positioning rings 5 and 6 for positioning the boss member 1 in the axial direction are disposed in contact with both end surfaces of the boss member 1 of each permanent magnet 4 in the axial direction, and are far from the tip of the boss member 1. The positioning ring 5 is positioned by being brought into contact with an outer flange portion 1c which is a positioning portion of the boss member 1, and the positioning surface of the positioning ring 6 on the distal end side of the boss member 1 coincides with the distal end surface of the boss member 1. Since the dimensions are set as described above, each permanent magnet 4 can be reliably positioned at a predetermined position in the axial direction of the boss member 1.

In particular, the nonmagnetic magnet cover 7 has inner flanges 7a and 7b at one end and the other end in the axial direction, respectively. The magnet cover 7 contacts the boss member 1 in a state where the inner flange portion 7b of the boss member 1 is in contact with the outer flange portion 1c, which is a positioning portion on the outer periphery of the boss member 1, and the other end surface of the boss member 1 from the outside. Since they are fixed, each magnet holding member 3 and each permanent magnet 4
Can be more firmly fixed to the boss member 1.

A groove used for fixing the permanent magnet 4 to the outer periphery of the boss member 1 is formed by a U-shaped groove 2.
Are parallel to each other along the longitudinal direction of the U-groove 2 in the middle of the parallel rising surfaces 2a, the bottom surfaces 2b closing the bottoms of the parallel rising surfaces 2a, and the parallel rising surfaces 2a. Since it has a shape having an arc-shaped groove 2c formed facing the same, a portion composed of the parallel rising surface 2a and the bottom surface 2b is processed by, for example, an end mill, and the arc-shaped groove 2c of each parallel rising surface 2a is formed by, for example, a ball. It can be processed with an end mill, so that permanent magnets 4
Can be fixed to the outer periphery of the boss member 1. In addition, 2x of FIG. 6 is a hole formed at the time of processing the U groove 2. End mills and ball end mills are commercially available, and the U-groove 2 can be easily processed without using a special cutting tool. Further, the U-shaped groove 2 used in the present invention can be easily processed, so that the processing time and the cost can be reduced. Furthermore, since the U-shaped groove 2 has a simple shape, the processing accuracy is improved, the adhesion to the magnet holding member 3 is improved, and a structure capable of sufficiently withstanding the high-speed rotation of the engine can be obtained.

[0030]

In the magnet rotor for a rotating electric machine according to the present invention, the groove used for fixing the permanent magnet to the outer periphery of the boss member is a U-shaped groove. It has a shape having a bottom surface closing the bottom of these parallel rising surfaces, and arcuate grooves formed opposite to each other along the longitudinal direction of the U groove in the middle of the rising direction of each parallel rising surface. Therefore, the part consisting of the parallel rising surface and the bottom surface can be machined by, for example, an end mill, and the arc-shaped groove of each parallel rising surface can be machined by, for example, a ball end mill. It can be fixed to the outer periphery of the member. End mills and ball end mills are commercially available, and grooves can be easily formed without using a special cutting tool. Further, the U-groove used in the present invention can be easily processed, so that the processing time and the cost can be reduced. Furthermore, since the U-shaped groove has a simple shape, the processing accuracy is improved, the adhesion to the magnet holding member is improved, and a structure capable of sufficiently withstanding the high-speed rotation of the engine can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an embodiment in which a magnet rotor for a rotating electrical machine according to the present invention is applied to a magnet rotor of a magnet type AC generator.

FIG. 2 is a sectional view taken along line AOA of FIG. 1;

FIG. 3 is an enlarged view in the X direction with the magnet cover removed in FIG. 1;

FIG. 4 is a front view of a boss member used in this example.

FIG. 5 is a longitudinal sectional view of a boss member used in this example.

FIG. 6 is a partially enlarged arrow view in the Y direction of FIG. 4;

FIG. 7 is a partially enlarged front view of the boss member shown in FIG. 4;

FIG. 8 is a perspective view of a magnet holding member used in the present example.

FIG. 9 is an enlarged front view of a main part in a state where a magnet cover is removed from the magnet rotor of the present example.

[Explanation of symbols]

 Reference Signs List 1 boss member 1a enlarged diameter portion 1b tapered hole 1c outer flange portion 2 U groove 2a parallel rising surface 2b bottom surface 2c arc-shaped groove 3 magnet holding member 3a locking member 3b arc-shaped convex portion 3c magnet holding portion 3c1 tapered portion 4 Permanent magnet 4a1 Tapered part 5,6 Positioning ring 7 Non-magnetic magnet cover 7a, 7b Inner flange

Continued on the front page F term (reference) 5H002 AA07 AA08 AB05 AB07 AC01 AC06 AE08 5H615 AA01 BB01 BB14 PP02 PP06 PP28 SS08 SS19 TT05 5H621 HH01 JK02 JK08 5H622 CA02 CA05 CA14 CB06 PP03 PP18

Claims (4)

[Claims] 1. A ferromagnetic material having holes along the axis for fitting a rotating shaft, and a plurality of U-grooves arranged in the circumferential direction at intervals in the circumferential direction. The U-grooves are parallel to each other and parallel to each other along the longitudinal direction of the U-groove in the middle of the parallel rising surfaces in the rising direction. A cylindrical boss member having an arc-shaped groove formed so as to face each other, and an arc-shaped convex portion fitted to each of the U-shaped grooves of the boss member. A locking member that is fitted and prevented from coming off and a magnet holding portion that is integrally formed with the locking member and that protrudes radially on the outer periphery of the boss member are provided, and each of the locking members corresponds to the boss member. A plurality of magnet holding members fitted into the U-groove and fixed to the boss member; A plurality of plate-shaped permanent magnets held between the magnet holding portions of the magnet holding member and magnetized in the radial direction of the boss member; and the magnet holding of each of the magnet holding members In the part, on both side surfaces of each of the magnet holding members on both sides facing the magnet holding portion,
A tapered portion is provided which is tapered in such a manner as to gradually protrude toward the magnet holding portion side of each of the magnet holding members on both sides as it goes outward in the radial direction of the boss member. A magnet rotor for a rotating electric machine, wherein a tapered portion inclined in the same direction as the tapered portion of the magnet holding portion is provided on a side surface of each of the permanent magnets in contact with the side surface of the magnet holding portion. 2. A ferromagnetic material having holes along the axis for fitting a rotating shaft, and a plurality of U-grooves arranged in the circumferential direction at intervals in the circumferential direction. The U-grooves are parallel to each other and parallel to each other along the longitudinal direction of the U-groove in the middle of the parallel rising surfaces in the rising direction. A cylindrical boss member having an arc-shaped groove formed so as to face each other, and an arc-shaped convex portion fitted to each of the U-shaped grooves of the boss member. A locking member that is fitted and prevented from coming off and a magnet holding portion that is integrally formed with the locking member and that protrudes radially on the outer periphery of the boss member are provided, and each of the locking members corresponds to the boss member. A plurality of magnet holding members fitted into the U-groove and fixed to the boss member; A plurality of plate-shaped permanent magnets sandwiched and held between the magnet holding portions of the magnet holding member and magnetized in the radial direction of the boss member; and the plurality of permanent magnets arranged in the outer peripheral direction of the boss member. It is formed in an annular shape so as to cover the outer peripheral surface of the magnet and the plurality of magnet holding members, and is fitted to the outer periphery of the group of the permanent magnets and the magnet holding members arranged side by side and fixed to the boss member. A non-magnetic magnet cover, the magnet holding portion of each of the magnet holding members, on both side surfaces facing the magnet holding portion of each of the adjacent magnet holding members,
A tapered portion is provided which is tapered in such a manner as to gradually protrude toward the magnet holding portion side of each of the magnet holding members on both sides as it goes outward in the radial direction of the boss member. A magnet rotor for a rotating electric machine, wherein a tapered portion inclined in the same direction as the tapered portion of the magnet holding portion is provided on a side surface of each of the permanent magnets in contact with the side surface of the magnet holding portion. 3. A pair of positioning rings for positioning each of the permanent magnets in the axial direction of the boss member on the outer periphery of the boss member, and abut against both end surfaces of the boss member of each of the permanent magnets in the axial direction. The positioning ring, which is farther from the distal end of the boss member, is positioned in contact with the positioning portion of the boss member, and the positioning ring on the distal end side of the boss member has the end face of the boss. The magnet rotor for a rotating electrical machine according to claim 1 or 2, wherein the dimensions are set so as to coincide with a front end surface of the member. 4. The non-magnetic magnet cover has inner flanges at one end and the other end in the axial direction, respectively. The inner flange at one end and the inner flange at the other end of the magnet cover are provided. 4. The rotating electric machine magnet according to claim 3, wherein the magnet cover is fixed to the boss member in a state where the magnet cover is in contact with the positioning portion on the outer periphery of the boss member and the end face on the other end side of the boss member from the outside. Rotor.