JPH0956090A - Field device for rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more inexpensively manufacture a solid field device for a rotating electric machine including the material cost, facility cost, assembling man-hours, machining man-hours, etc. SOLUTION: A field device for a rotating electric machine is provided with a hollow cylindrical yoke 1 made of soft magnetic metrical, a plurality of pieces of permanent magnets 2 having external surfaces which are stock to the inner peripheral surface of the yoke 1 with adhesive 4, and a thin-wall hollow cylindrical sleeve 3 having an outer peripheral surface pressed against the inner peripheral surface of the magnets 2 with a pressure force. Since the sleeve 3 is inexpensively formed in a cylindrical shape and the magnets 2 which are pushed the sleeve 3 are fixed to the inner peripheral surface of the yoke 1 with the adhesive 4, the field device can be constituted in a solid state even when the material cost, facility cost, and assembly man-hours of the field device are reduced. In addition, when self-curing adhesive is used as the adhesive 4, the field device can be assembled more easily into a solid structure, because the adhesive spreads itself through the contacting surfaces and forms a strong adhesive surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field device for a rotary electric machine using a permanent magnet as a field pole of a stator, and more particularly,
The present invention relates to a field device of a rotating electric machine suitable for use under adverse conditions of high temperature and high vibration, such as a starter motor of an automobile engine, and belongs to the technical field of rotating electric machines.

[0002]

2. Description of the Related Art A field device having a permanent magnet as a field magnetic pole of a stator has been put into practical use in many rotary electric machines such as conventional generators and electric motors. As a method of assembling the field device of this rotary electric machine, a method of applying an adhesive to at least one of the outer peripheral surface of the field magnet and the inner peripheral surface of the stator and adhering them to each other has long been adopted. As a technique for simplifying this work, there is, for example, "a method for fixing a field magnet of a rotating electric machine" disclosed in Japanese Patent Publication No. 62-33826.

In the above publication, a metal magnet cover is inserted into a cylindrical yoke, and then the magnet is press-fitted into a space of a small diameter portion of the magnet cover between them, and an adhesive is dropped to fix the magnet. The method for assembling the field device of the rotating electric machine is described. It is also mentioned that the magnet cover can be made of any material regardless of whether it is magnetic or non-magnetic.

[0004]

However, in the above-mentioned prior art, the number of steps is required in the step of applying and adhering the adhesive to the inner peripheral surface of the magnet or the stator, and the equipment for automation becomes large. Further, in the technique of the above publication using a sleeve, a small diameter portion that comes into contact with the inner peripheral surface of the magnet and a large diameter portion that fits on the inner peripheral surface of the yoke and regulates the press-fitting depth of the magnet are provided in the magnet cover. It is assumed that it is provided on the outer peripheral surface.

Therefore, it is necessary to form the magnet cover into a two-stage cylinder at a minimum, and a process such as drawing is required. Therefore, the processing cost is higher than the case where a cylindrical material is used. In addition, if a protrusion (ironing part) is provided on the magnet cover between magnets in order to ensure the space between adjacent magnets, the cost of equipment and man-hours are still high, which does not lead to effective cost reduction. There was an inconvenience.

Therefore, in the field device of the rotating electric machine of the present invention, while having a fixed holding force of the magnet which is not inferior to the prior art,
It is an issue to be solved that it can be manufactured at a lower cost including all costs such as material cost, equipment cost, assembly man-hours, and processing man-hours.

[0007]

According to a first aspect of the present invention, a yoke having a substantially hollow cylindrical shape made of a soft magnetic material and an outer periphery facing the inner peripheral surface of the yoke with a self-curing adhesive are used. A field device for a rotary electric machine, comprising: a plurality of permanent magnets each having a surface; and a thin hollow cylindrical sleeve having an outer peripheral surface that abuts an inner peripheral surface of the permanent magnet with a pressing force.

Here, the yoke may have a cylindrical shape with both ends open, or may be integral with the cap, and may or may not also serve as the casing.
As the adhesive, an optimum adhesive is selected in consideration of the materials of the inner peripheral surface of the yoke and the outer peripheral surface of the permanent magnet to be joined together, the operating environment such as temperature and vibration, and the cost. Ferrite or rare earth magnets can be used as the permanent magnet, but the permanent magnet is not limited thereto. Although the sleeve has a thin hollow cylindrical shape, it does not necessarily have to be a strictly hollow cylindrical shape. That is, a sleeve having a tapered portion, a taper shape as a whole, a barrel-shaped bulge in the middle portion, or a large-diameter portion at one end is appropriately adopted. it can. Similarly, the material for forming the sleeve may be magnetic or non-magnetic, or may be metallic.

A second structure of the present invention is characterized in that, in the first structure, the sleeve further has the outer peripheral surface adhered to the inner peripheral surface of the permanent magnet with an adhesive. According to a third structure of the present invention, in addition to the first structure, the sleeve is formed by rolling a plate material, and a butting portion in a circumferential direction of the plate material is located on an inner peripheral surface of the permanent magnet. It is characterized by being

According to a fourth structure of the present invention, in addition to the above-mentioned first structure, the sleeve is made of a synthetic resin having ridges on the outer peripheral surface which are arranged at equal intervals in the circumferential direction and extend in the direction parallel to the rotation axis. It is characterized by being formed. here,
The ridges may be a set of two ridges that are arranged in parallel at a predetermined interval and are arranged at equal intervals in the circumferential direction.

A fifth configuration of the present invention is the same as the first configuration or the second configuration, further comprising: the inner peripheral surface of the yoke, the outer peripheral surface of the sleeve, the outer peripheral surface and the inner peripheral surface of the permanent magnet. At least one of them has a groove having at least one end opening at the peripheral edge of the joint surface with the permanent magnet.

[0012]

In the first structure of the present invention, since the self-curing adhesive is used, the fluidity of the adhesive becomes high, and the adhesive also penetrates into minute gaps due to the capillary phenomenon. In addition, since it is a self-curing type, it does not require volatilization of the solvent, etc., and it cures even in the deep gaps that do not come into contact with air to form a strong adhesive surface. Therefore, only by dropping the adhesive on the peripheral portion of the joint surface with the permanent magnet on the inner peripheral surface of the yoke or the outer peripheral surface of the sleeve that is in contact with the permanent magnet, the adhesive is spread over the entire joint surface.

Therefore, according to this structure, the rotation that can be manufactured at a lower cost, including all costs such as material cost, equipment cost, assembly man-hours, and processing man-hours, while maintaining sufficient fixing and holding ability of the permanent magnet. A field device for an electric machine can be provided. Further, since it is not necessary to apply an adhesive to the joint surface in advance before assembling, there is an effect that the assembling work is further simplified and the field device of the rotary electric machine can be manufactured at a lower cost.

In the second structure of the present invention, the inner peripheral surface of the permanent magnet is further adhered to the sleeve, and since the adhered surface is also pressed, it is difficult to peel it off, and the permanent magnet also adheres to the sleeve. There is no fear of slipping. Therefore, according to this configuration, it is possible to provide a more robust magnetic field device for the rotating electric machine than the first configuration, only at a slight cost required for the adhesive.

In the third structure of the present invention, since the sleeve is formed by rolling the plate material, the sleeve can be easily formed by using an inexpensive rectangular flat plate material. Therefore, according to this configuration, it is possible to provide the field device of the rotary electric machine at a lower cost than in the case where the sleeve is formed of a pipe material or the like. In the fourth structure of the present invention, the outer peripheral surface of the sleeve has a plurality of ridges arranged at equal intervals in the circumferential direction extending in the axial direction, so that the position of the permanent magnet is restricted by the ridges. The permanent magnet is arranged at a predetermined position without using a jig. For the same reason, the shear displacement of the permanent magnet in the circumferential direction is also restricted. Further, since the sleeve is made of synthetic resin, it can be mass-produced at low cost using a simple mold.

Therefore, according to this configuration, the cost of the sleeve parts (when mass-produced) is low, and the jig cost and the number of assembling steps are reduced, so that a robust field device can be provided at a lower cost. it can. In the fifth configuration of the present invention,
A groove opened at the peripheral edge of the surface to be joined to the permanent magnet is formed on at least one of the surfaces to be bonded to each other. The adhesive flows from the opening of the peripheral portion through the groove to the inner depth of the joint surface, and further penetrates from the groove to the peripheral joint surface.

Therefore, according to this structure, when it is uncertain whether or not the adhesive permeates the entire joint surface in consideration of the fluidity and wettability of the adhesive and the adhesive area (for example, when the field device is large). Also, the adhesive can be surely penetrated into the entire joint surface. As a result, even in a field device of a large rotating electric machine, it can be manufactured more robustly, reliably and inexpensively by a simple means of dropping the adhesive on the peripheral portion after the surfaces to be bonded face each other and contact each other. The effect that can be produced.

[0018]

[Example 1: Field device of rotating electric machine having sleeve made of pipe material]

(Structure of Embodiment 1) As shown in FIGS. 1 and 2, a field device for a rotary electric machine according to Embodiment 1 of the present invention includes a yoke 1, a plurality of permanent magnets 2, and a sleeve 3 in order from the outer peripheral side. It is configured. The inner peripheral surface of the yoke 1 and the outer peripheral surface of the permanent magnet 2 facing and abutting the yoke 1 are bonded and fixed to each other by a self-curing adhesive 4.

The yoke 1 is made of a soft magnetic alloy having a high magnetic permeability and a high magnetic flux saturation density and is a rotationally symmetric, substantially hollow cylindrical member integrally formed, and also serves as a casing of a rotary electric machine. One end in the axial direction of the hollow cylindrical portion of the yoke 1 forms an open end 1a that is cut off. At the other end of the yoke 1, a front lid 1c having a shaft hole 1d as a center
Are formed continuously, and a ring-shaped or individual protrusion 1b protruding into the inner space of the yoke 1 is formed near the outer peripheral portion of the front lid 1c.

As described above, since the yoke 1 has a rotationally symmetric shape about the rotation axis, it is extremely easy to perform casting, cutting and the like and is manufactured at a low cost. Permanent magnet 2
Is a block formed of a ferrite magnet, the inner peripheral surface and the outer peripheral surface of which have a concentric cylindrical curvature with respect to the rotating shaft of the rotating electric machine, and have the same cross section in the axial direction. However, on the inner peripheral surface of the permanent magnet 2, as shown in FIG. 1, a tapered portion 2a is formed at the end of the yoke 1 on the side of the open end 1a.
There are a total of six permanent magnets 2 arranged at equal angles around the rotation axis, and each permanent magnet 2 is adhesively fixed to the inner peripheral surface of the yoke 1.

The sleeve 3 is a hollow cylindrical seamless member and is formed by cutting a non-magnetic stainless steel pipe material having a wall thickness of 0.3 mm to a length similar to that of the permanent magnet 2. ing. Therefore, the sleeve 3 does not require a special processing step, and the material cost and the processing cost for manufacturing the sleeve 3 are extremely low. The outer diameter of the sleeve 3 is slightly larger than the diameters of the inner peripheral surfaces of the six permanent magnets 2 bonded in the yoke 1. Therefore, the sleeve 3 held between the permanent magnets 2 is A pressing force is constantly generated on the contact surface with 2. (Thus, the sleeve 3 is elastically deformed to some extent, and its circularity is slightly reduced.) Therefore, between the inner peripheral surface of the yoke 1 and the outer peripheral surface of the sleeve 3 and each permanent magnet 2. , A pressing force (compressive stress) perpendicular to the contact surface is always generated, and tensile stress does not work even if vibration or shock acceleration is applied. Similarly, in normal operation, no large shearing force is applied to the contact surface. Therefore, the permanent magnets 2 are firmly fixed and held in the yoke 1 without the risk of peeling or displacement of the adhesive surface.

The self-curing adhesive 4 is a cyanoacrylate-based self-curing adhesive, and is formed between the inner peripheral surface of the yoke 1 and the outer peripheral surfaces of the permanent magnets 2 facing each other. It fills the minute gaps and solidifies to bond them together. As described above, a pressing force is constantly applied to the adhesive surface by the spring elasticity of the sleeve 3, and peeling or misalignment hardly occurs.

The self-curing adhesive 4 has high fluidity and wettability with respect to each material before being cured, and has a property of penetrating into details due to a capillary phenomenon. Also, the adhesive is
Curing is fast, heating and evaporation of the solvent are not required for curing, and there is almost no volume shrinkage. Further, although the adhesive 4 after curing is relatively weak against impact tensile stress,
Its adhesive strength is extremely strong and its chemical stability is high.

Since the field device of the rotary electric machine of this embodiment is constructed as described above, it can withstand use in a bad environment where there are many vibrations and shocks. Not only that, but the cost of the constituent elements is extremely low. Therefore, if the manufacturing method described below can be implemented at low cost, the field device of the rotating electric machine can be manufactured at extremely low cost. (Manufacturing Method of First Embodiment) As described above, the main components of the field device of the rotating electric machine of this embodiment are the yoke 1, the six permanent magnets 2 and the sleeve 3, which are all manufactured at low cost. Therefore, the component cost is low.

The assembly and manufacture of the field device of the rotary electric machine of this embodiment can be carried out by the following procedure. First, using a simple assembly jig, the six permanent magnets 2 are held at equal intervals in the circumferential direction, inserted into predetermined positions in the yoke 1, and brought into contact with the inner peripheral surface of the yoke 1 with a pressing force. At the time of insertion, the ring-shaped protrusion 1 formed on the front cover 1c of the yoke 1
Since the top part of b abuts on the tip end surface of each inserted permanent magnet 6 and regulates the insertion position, no special jig for regulating the insertion depth is required.

Next, the self-curing adhesive 4 is dripped on the peripheral edge of the contact surface of each permanent magnet 2 that faces and contacts the inner peripheral surface of the yoke 1. The adhesive 4 penetrates into the minute gaps formed between the inner peripheral surface of the yoke 1 and the outer peripheral surface of each permanent magnet 2 by a capillary phenomenon, spreads to the contact surface, and then hardens to firmly bond the two. To glue. Here, since the above-mentioned minute gap is usually formed naturally by the finishing accuracy of the work,
There is no need for a step of forming irregularities to form fine gaps. However, it is also possible to provide such a process or perform processing.

The position on the peripheral edge of the contact surface of each permanent magnet 2 onto which the self-curing adhesive 4 is dropped is determined in consideration of the size of the contact surface and the penetrating force of the adhesive 4. For example,
If the penetrating force is sufficient, the adhesive 4 spreads over the entire abutting surface only by dropping it on the peripheral edge of the rear end of each permanent magnet 2, and the number of steps required for bonding is extremely small. On the contrary, when it is determined that the penetrating force is insufficient, the adhesive 4 is adhered along both peripheral edges extending in the axial direction formed by both side surfaces of each permanent magnet 2 and the inner peripheral surface of the yoke 1. By supplying the agent 4, the adhesive 4 can be permeated into the entire contact surface. In order to supply the adhesive 4 to both inner peripheral edges of the yoke 1, there are a method of dropping the adhesive 4 in various places using an elongated nozzle and a method of utilizing the fluidity of the adhesive 4. The latter is a method in which the yoke 1 is held perpendicularly or obliquely with respect to the horizontal plane, an appropriate amount of the adhesive 4 is dropped on the peripheral edge portion near the opening end 1a, and it is allowed to flow down along the peripheral edge due to gravity.

After the permanent magnets 2 are bonded to the inner peripheral surface of the yoke 1 by the adhesive 4 in this way, the sleeve 3 is inserted along the inner peripheral surfaces of the six permanent magnets 2 to a proper depth. In this insertion step, since the outer diameter of the sleeve 3 is large as described above, the sleeve 3 is press-fitted. For example, the sleeve 3 guided by the tapered portion of the permanent magnet 2 is placed on the yoke 1 placed with the open end 1a upward on a horizontal table, and a pressing tool having a horizontal lower end surface from above is placed. You can apply pressure with. Therefore, the process of inserting the sleeve 3 can be performed extremely easily without requiring a special assembly jig or device.

The jig holding the permanent magnets 2 in the yoke 1 may be removed after the yoke 1 and the permanent magnets 2 are bonded or after the sleeve 3 is inserted. Also, after inserting the sleeve 3, the outer peripheral surface of the sleeve 3 and the inner peripheral surface of each permanent magnet 2 can be bonded by the self-curing adhesive 4 in the same manner as described above. Then,
The robustness of the field device of this embodiment is further increased, which is preferable.

By the way, the field device of the rotating electric machine of the present embodiment can be manufactured by a method different from the above assembling procedure (first manufacturing method). The second manufacturing method and the third manufacturing method will be briefly described below. The second manufacturing method is a method in which the sleeve 3 is inserted into the yoke 1 and then the six permanent magnets 2 are inserted into the gap between the yokes 1 while being held at equal intervals in the circumferential direction. In this method, the permanent magnets 2 pressed and held on the inner peripheral surface of the yoke 1 by the pressing force of the sleeve 3 are bonded and fixed by the adhesive 4 as in the first manufacturing method.

Here, it is preferable that the sleeve 3 is manufactured to be a little longer than that shown in FIG. 1 in the axial direction so that the tip of the sleeve 3 comes into contact with the inner surface of the front lid 1c of the yoke 1 and stops. In addition, it is preferable that the inner peripheral surface of the opening end 1a of the yoke 1 and the inner peripheral surface and the outer peripheral surface of the tip end of each permanent magnet 2 are also provided with a tapered portion because the insertion work becomes easier. ..

The third manufacturing method is that the permanent magnets 2 are bonded to the outer peripheral surface of the sleeve 3 with an adhesive 4 to form an intermediate structure, and then the structure is inserted into the yoke 1 and bonded. It is a method of fixing. Also in this manufacturing method, since press-fitting is performed in the insertion step, as in the second manufacturing method, either the inner peripheral surface of the opening end 1a portion of the yoke 1 or the outer peripheral surface of the tip end portion of each permanent magnet 2, It is desirable that the tapered portion is formed.

In any of the above three manufacturing methods, no special jig, device, equipment or the like is required for the assembling work, and the number of assembling steps is extremely small. The cost of assembly manufacturing is
It is extremely inexpensive. (Effects of First Embodiment) As described in detail above, the field device for a rotating electric machine of the present embodiment has a small number of constituent elements, and its component price and the number of processing steps at the time of assembly and manufacturing are extremely low. There is an effect that it can be manufactured.

Further, since the sleeve 3 presses the permanent magnets 2 against the inner peripheral surface of the yoke 1, the self-curing adhesive 4 does not peel off, and the permanent magnets 2 are extremely firmly fixed in the yoke 1. Retained. As a result, the field device of the rotary electric machine according to the present embodiment withstands use even in a bad environment where there are many vibrations and shocks, and is extremely robust. (Modification 1) FIG. 3 shows a modification 1 of the first embodiment.
As shown in Fig. 1, a ridge 1 protruding toward the center and extending in the axial direction
A configuration is possible in which the same number of the permanent magnets 2 as the number of the permanent magnets 2 are provided on the inner peripheral surface of the yoke 10 at equal intervals in the circumferential direction. That is, only the cross-sectional shape of the yoke 10 is different from that of the first embodiment, and each permanent magnet 2 and the sleeve 3 are the same as those of the first embodiment in the field device of the rotary electric machine. Similar to the first embodiment, each permanent magnet 2 is pressed and urged by the sleeve 3, and then the yoke 10 is pressed.
It is bonded and fixed by a self-curing adhesive 4.

In this modification, since the protrusions 11 regulate the positions of the permanent magnets 2 during the assembling work, a simple assembling jig is sufficient, or an assembling without any jig is possible. is there. As a result, in addition to the effect of the first embodiment, there is an effect that the cost of the assembling jig and the like and the number of assembling steps are further reduced. Further, even if a problem occurs on the bonding surface, there is an effect that the positions of the permanent magnets 2 in the circumferential direction do not shift.
Not only that, if the positions of the permanent magnets 2 in the axial direction are also restricted by protrusions of the front lid and the rear lid (not shown), the field device of the rotating electric machine can be assembled without using the adhesive 4. It is possible to manufacture.

(Modification 2) Modification 2 of the first embodiment
As shown in FIG. 4, the same number of protrusions 31 arranged in the circumferential direction and extending in the axial direction as the permanent magnets 2,
A configuration including a sleeve 30 made of nylon resin on the outer peripheral surface is possible. The protrusions 31 are fitted in the spaces between the permanent magnets 2 adjacent to each other, and regulate the position of each permanent magnet 2 in the circumferential direction. Here, the yoke 1 and each permanent magnet 2
Are the same as those in the first embodiment.

Also in this modification, since the protrusions 31 regulate the positions of the permanent magnets 2, the same effects as those of the above-described modification 1 can be exhibited. In addition, the sleeve 30 made of synthetic resin can be manufactured at an extremely low cost if mass-produced, so that it is possible to provide a field device for a rotating electric machine that is much cheaper than the modification 1. The sleeve 3
As the synthetic resin forming 0, various resins other than nylon can be adopted according to the convenience of production and the use environment after production. For example, the gap between the inner peripheral surface of the permanent magnet 2 and the rotor (not shown) is small, and the outer peripheral portion of the rotor and the sleeve 30 are small.
When it is expected that the inner peripheral surface of the above will slightly contact and slide, it is possible to use Teflon which has a small frictional resistance and is hard to wear. Alternatively, when it is expected that the sleeve 30 will be used under extremely high temperatures, it is recommended to form the sleeve 30 with a heat resistant resin such as polyimide.

(Modifications 3 and 4) In Modifications 3 and 4, as shown in FIGS. 5 and 6, the curvature of the outer peripheral surface of each permanent magnet 2 in Embodiment 1 or each of the above modifications,
This is a field device of a rotating electric machine in which the curvature of the inner peripheral surface of the yoke 1 or 10 facing these is slightly different. By slightly differentiating the curvatures of the two, a minute gap 5 is intentionally formed on the contact surface between the two. Due to the minute gap 5, the self-curing adhesive 4 sufficiently penetrates into the contact surface to form a strong adhesive surface. The maximum thickness of this minute gap 5 is
It is known that 10 to 20 μm is most suitable, the cyanoacrylate-based adhesive 4 easily penetrates, and exhibits a strong adhesive force. (This value may change due to the difference in the composition of the adhesive 4 or the like.) That is, in Modification 3, as shown in FIG.
Alternatively, the radius of curvature r1 of the inner peripheral surface of 10 is slightly longer than the radius of curvature r2 of the outer peripheral surface of each permanent magnet 2. As a result, minute gaps 5 are formed on both sides of the contact surface, so that the adhesive 4 can be permeated from the periphery of the contact surface of each permanent magnet 2.
It's getting easier.

Further, in the modified mode 4, as shown in FIG.
The radius of curvature r1 of the inner peripheral surface of the yoke 1 or 10 is slightly shorter than the radius of curvature r2 of the outer peripheral surface of each permanent magnet 2.
As a result, the minute gap 5 is formed in the center of the contact surface in the circumferential direction, and it becomes easier for the adhesive 4 to permeate from the peripheral edge of the end of each permanent magnet 2. As mentioned above,
According to the both modified embodiments, by forming the appropriate minute gap 5, the adhesive 4 easily permeates the entire contact surface, and a strong and reliable adhesive force is exhibited. As a result, it is possible to provide a more robust field device for a rotating electric machine.

(Modification 5) As shown in FIG. 7, the modification 5 has a plurality of grooves 21 and 22 extending in the axial direction in each of the permanent magnets 2 in the first embodiment and each modification. A field device for a rotating electric machine formed on an outer peripheral surface and an inner peripheral surface. Self-curing adhesives 41 and 42 have penetrated and hardened on both surfaces to form strong adhesive surfaces.

That is, (Other Modification) A sleeve longer in the axial direction than the sleeve of Embodiment 1 shown in FIG. 1 is provided, and both ends of the sleeve are on the inner surface of the front lid 1c and the inner surface of the rear lid. Modifications are also possible, characterized in that they abut each other.

In the present modification, the field forming portion composed of each permanent magnet 2 and the inner peripheral surface of the yoke 1 and the adhesive 4 for adhering them is separated from the rotor (not shown) by a long sleeve. As a result, the following effects are brought about in addition to the effects of the first embodiment. That is, the loss due to air resistance is reduced, and the rust and adhesive 4 generated in the field forming portion are also reduced.
Since debris such as the debris are not caught in the rotor, a problem resulting from this can be prevented in advance.

On the contrary, a sleeve shorter in the axial direction than the sleeve of the first embodiment is adopted, and each permanent magnet 2 is biased by the pressing force from the sleeve at the intermediate portion in the axial direction, In the same manner as in No. 1, a modified mode in which the adhesive 4 is adhered and fixed is also possible. In this modification, each permanent magnet 2
Since both ends of each of the short sleeves are exposed from the rotor by protruding from both ends of the short sleeve, the adjacent permanent magnets 2
The space between is also open to the space containing the rotor. As a result, the following effects are brought about in addition to the effects of the first embodiment. That is, the air heated by the heat generation of the rotor can be circulated to the inner peripheral surface of the yoke 1 without increasing the air resistance of the rotor so much, and the effect of improving the cooling of the rotating electric machine can be obtained.

The same effect can be achieved by a modification in which a plurality of short (cylindrical or ring-shaped) sleeves are arranged in the axial direction. It should be noted that each of the modifications described above can be applied independently or in combination of a plurality of modifications. [Example 2: Field device for a rotating electric machine having a sleeve made of a round plate] As shown in Fig. 8, the field device for a rotating electric machine according to the present embodiment has a yoke 1 and a plurality of permanent magnets in order from the outer peripheral side. 2 and a sleeve 32, and adhesive 4,4
It is adhesively fixed by 3. Of these, the yoke 1 and each permanent magnet 2 are the same as those in the first embodiment, and each permanent magnet 2 is pressed and biased by the sleeve 32 so that the outer peripheral surface of the permanent magnet 2 is brought into contact with the inner peripheral surface of the yoke 1. , Is firmly adhered and fixed by the adhesive 4.

On the other hand, the sleeve 32 is formed into a cylindrical shape by rolling a rectangular (rectangular) plate material, unlike the first embodiment using a pipe material. Therefore, as shown in FIG. 8, both ends 32a and 32b of the plate member are joined together with their end faces abutting each other. (In the figure, gaps are drawn for easier understanding.) The abutting portions of the both ends 32a and 32b are just on the inner peripheral surface of the permanent magnet 2 so that they do not overlap each other. Adhesive fixed. The sleeve 32 is not only adhered and fixed at the abutting portion, but also the inner peripheral surface of each permanent magnet 2 and the sleeve 3 that abuts against them.
The outer peripheral surface of 2 is firmly fixed with an adhesive 43.

As these adhesives 4 and 43, a cyanoacrylate-based self-curing adhesive is used as in the first embodiment. Therefore, after assembling (contacting) the above-mentioned members, a strong bonding surface can be formed by permeating the adhesives 4, 43 from the peripheral edge of the contacting surface, which facilitates assembly and reduces man-hours. It can be reduced. In addition, as in the first embodiment, each adhesive surface has a sleeve 3
Since the compressive stress is previously applied by the pressing force of 2, and the tensile stress is unlikely to be generated on the adhesive surface due to the vibration or impact during the operation, the field device of the rotating electric machine is firmly formed.

As described above, according to the present embodiment, the same effects as those of the first embodiment are exhibited, and the material of the sleeve 32 is a plate material which is cheaper than the pipe material. It is possible to provide the field device of the rotary electric machine at low cost. It should be noted that, also in this embodiment, the same effect can be obtained by adopting the same modified mode as that of the first embodiment.

[Brief description of drawings]

FIG. 1 is a sectional view taken along an axis of a field device of a rotating electric machine according to a first embodiment.

2 is a cross-sectional view of the field device of Example 1 (II-I in FIG. 1)
(I cross section)

FIG. 3 is a cross-sectional view showing the structure of Modification 1 of the field device of Example 1.

FIG. 4 is a cross-sectional view showing the structure of Modification 2 of the field device of Example 1.

FIG. 5 is a cross-sectional view showing the structure of Modification 3 of the field device of Example 1.

FIG. 6 is a partial cross-sectional view showing the structure of Modification 4 of the field device of Example 1.

FIG. 7 is a partial cross-sectional view showing the structure of Modification 5 of the field device of Example 1.

FIG. 8 is a sectional view taken along the axis of the field device of the rotating electric machine according to the second embodiment.

[Explanation of symbols]

1, 10: Yoke 11: Projection (formed on the inner peripheral surface of the yoke) 1a: Opening end 1b: Projection 1c: Front lid 1
d: shaft hole 2, 20: permanent magnet 2a: tapered portion 21, 22:
Grooves (for adhesive penetration) 3,30,32: Sleeves (pipe material, synthetic resin, plate material) 31: Protrusions 4,41, 42, 43: Self-curing adhesive (cyanoacrylate type etc.) 5: Minute gap (10-20 μm)

Claims (5)

[Claims] 1. A substantially hollow cylindrical yoke made of a soft magnetic material, a plurality of permanent magnets having an outer peripheral surface facing the inner peripheral surface of the yoke and bonded with a self-curing adhesive, A thin-walled hollow cylindrical sleeve having an outer peripheral surface that comes into contact with the inner peripheral surface of the magnet with a pressing force, and a field device for a rotary electric machine. 2. The field device for a rotary electric machine according to claim 1, wherein the sleeve has the outer peripheral surface adhered to the inner peripheral surface of the permanent magnet with an adhesive. 3. The field of a rotary electric machine according to claim 1, wherein the sleeve is formed by rolling a plate material, and a circumferential butting portion of the plate material is located on an inner peripheral surface of the permanent magnet. Porcelain device. 4. The field of a rotary electric machine according to claim 1, wherein the sleeve is formed of a synthetic resin having ridges on the outer peripheral surface, which are arranged at equal intervals in the circumferential direction and extend in a direction parallel to the rotation axis. Porcelain device. 5. The at least one of the inner peripheral surface of the yoke, the outer peripheral surface of the sleeve, the outer peripheral surface and the inner peripheral surface of the permanent magnet has at least one end of a joint surface with the permanent magnet. The field device for a rotating electric machine according to claim 1 or 2, wherein the field device has a groove that opens at a peripheral edge.