JP2001197692A - Field system of rotary machine, magnet unit of field system, method of manufacturing magnet unit of field system, and method of manufacturing field system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the field system of a rotary machine in which manufacturing cost can be reduced, and a method of manufacturing for the field system. SOLUTION: A magnet cover 19 for protecting a permanent magnet 18 is previously bonded and molded into a unified body with the magnet 18. In the assembling, the cover 19 is built in a field molder 13 of the field system 11, together with a permanent magnet 18. The cover 19 is formed to be longer than the length of circular arc of the inner peripheral surface 18a of the magnet 18 and bonded to the inner peripheral surface 18a of the magnet 18, in such a manner that both side parts 19b, 19c of the cover 19 are protruded outwardly by a specified length L1, from both side surfaces 18b, 18c of the magnet 18. Bending work of the cover 19 and bonding work of the cover 19 and the magnet 18 are performed continuously at the same time.

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 rotating equipment, and more particularly to a field device used for a permanent magnet motor.

[0002]

2. Description of the Related Art Conventionally, in a rotating device, various field devices for holding a permanent magnet have been proposed in order to prevent trouble due to breakage of the permanent magnet. An example is disclosed in JP-A-9-322443.
The field device covers a permanent magnet with a magnet cover having an arc-shaped portion having the same radius as the inner peripheral radius of the magnet, and then provides locking portions formed on both sides of the magnet cover on the magnet holder. The magnet holder is held by engaging the engaging portion.

[0003]

Incidentally, the magnet cover has been formed by press working in order to form the arc-shaped portion and the locking portion. Further, when assembling the permanent magnet, the permanent magnet is combined with the magnet cover and then assembled together with the magnet cover to the magnet holder, so that the assembling work is not easy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a field device for a rotating device, a magnet unit for a field device, and a field device capable of reducing manufacturing costs. An object of the present invention is to provide a method of manufacturing a magnet unit of a device and a method of manufacturing a field device.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 includes a plurality of fitting holding portions formed on a field holder having a yoke externally fitted therein. In a field device of a rotating device in which a permanent magnet whose peripheral surface and both side surfaces are covered with a magnet cover is fitted, the magnet cover is fitted to the fitting holding portion while being bonded to the permanent magnet with an adhesive. The gist is that they have been combined.

According to a second aspect of the present invention, in the field device for a rotating device according to the first aspect, an inner peripheral surface of the permanent magnet is adhered and fixed to the magnet cover with an adhesive. The gist of the invention is that both sides of the magnet cover are bent and abutted on both sides.

According to a third aspect of the present invention, a plurality of permanent magnets and a magnet cover which covers the inner peripheral surface and both side surfaces of the permanent magnet are formed on a field holder to which a yoke is externally fitted. In the magnet unit of the field device fitted to the fitting holding portion, the gist is that the magnet cover is bonded and fixed to the inner peripheral surface of the permanent magnet with an adhesive.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a magnet unit of a field device comprising a permanent magnet and a magnet cover covering the inner peripheral surface and both side surfaces of the permanent magnet. After applying an adhesive to the inner peripheral surface of the permanent magnet, the flat plate is pressed against the inner peripheral surface, and the flat plate is bonded and fixed to the inner peripheral surface of the permanent magnet. The gist is that a portion protruding laterally from the inner peripheral surface of the flat plate adhered to the inner peripheral surface of the permanent magnet is cut leaving a portion covering both side surfaces of the permanent magnet.

According to a fifth aspect of the present invention, a magnet unit including a permanent magnet and a magnet cover covering the inner peripheral surface and both side surfaces of the permanent magnet is formed on a field holder to which a yoke is fitted. In a method of manufacturing a field device formed by fitting a plurality of fitting holding portions, an adhesive is applied to an inner peripheral surface of the permanent magnet, and a flat plate is arranged so as to face the inner peripheral surface. After that, the flat plate is pressed against the inner peripheral surface, and the flat plate is adhered and fixed to the inner peripheral surface of the permanent magnet, and the portion protruding laterally from the inner peripheral surface of the flat plate adhered to the inner peripheral surface of the permanent magnet. When the magnet unit is cut by leaving a portion covering both side surfaces of the permanent magnet, and the magnet unit is fitted from the outside to the inside with respect to the fitting holding portion of the field holder, Fitted while bending the parts covering both sides The gist of the door.

(Operation) According to the first to third aspects of the present invention, the number of assembling steps can be reduced and the assembling work can be reduced as compared with the prior art in which the permanent magnet and the magnet cover are separately assembled to the field holder. It will be easier. as a result,
The manufacturing cost of the field device can be reduced.

According to the fourth aspect of the present invention, since the magnet cover and the permanent magnet are easily bonded in a series of continuous operations, the magnet unit is easily manufactured. According to the invention described in claim 5, the magnet cover and the permanent magnet are
Since the magnet unit is easily bonded in a series of continuous operations, the magnet unit is easily manufactured. Also, since the magnet unit is fitted into the fitting holding portion of the field holder while bending both sides of the magnet cover covering both sides of the permanent magnet, the magnet unit is locked to both sides of the magnet cover as compared with the related art. It is not necessary to provide an engaging portion or the like in the portion and the fitting holding portion of the field holder. As a result, the number of manufacturing steps and manufacturing cost of the field device can be reduced.

Further, both sides of the bent magnet cover are:
Since the magnetic unit has an elastic force that urges the fitting holding portion of the field holder, the magnet unit is securely held by the field holder even in the rotation direction of the field device.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, an electric motor 10 as a rotating device according to the present embodiment includes a field device 11 and an armature 12 inserted into the field device 11.
And

As shown in FIGS. 1 to 3, the field device 11 includes a field holder 13, a plurality of magnet units 14 fitted and held by the field holder 13, and the plurality of magnet units 14. And a yoke 15 on which the fitted field holder 13 is fitted.

As shown in FIG. 2, the field holder 13 is made of a synthetic resin, and has ring-shaped disks 13a and 13b formed on both sides thereof and a plurality of connections for connecting the two disks 13a and 13b. 1 (shown in FIG. 1). In the present embodiment, the two disks 13a, 13b
Are integrally connected by four connecting portions 16 arranged at equal angular intervals on the circumference of the disks 13a and 13b. The inner and outer peripheral surfaces of each connecting portion 16 are the disks 13a,
13b is formed in a sector shape so as to coincide with the inner and outer peripheral surfaces. The space formed between the adjacent connecting portions 16 is a fitting holding portion 17 for fitting and holding the magnet unit 14. That is, in the present embodiment, the field holder 13 is formed with four fitting holding portions 17. The magnet unit 14 is fitted and held in each of the fitting holding sections 17.

As shown in FIG. 1, the magnet unit 14 has a permanent magnet 18 formed in a sector shape in cross section and a connecting portion 19a integrally bonded to an inner peripheral surface 18a of the permanent magnet 18 with an adhesive. And a magnet cover 19.
The magnet unit 14 is provided on both sides 1 of the permanent magnet 18.
8b, 18c, both sides 19b, 1 of magnet cover 19 covering
9c is fitted to the fitting and holding portion 17 so as to press against both side surfaces 17a and 17b of the fitting and holding portion 17. Further, as shown in FIG. 2, the magnet unit 14 has both ends 18 d and 18 e in the longitudinal direction of the permanent magnet 18 and both ends 19 d and 19 e in the longitudinal direction of the magnet cover 19. It is fitted to the fitting holding portion 17 so as to abut on both longitudinal side surfaces 17c and 17d. further,
As shown in FIG. 1, the magnet unit 14 is held such that the inner peripheral surface 15 a of the yoke 15 on which the field holder 13 is fitted is in contact with the outer peripheral surface 18 f of the permanent magnet 18.

Next, a method for fitting and holding the magnet unit 14 to each fitting holding portion 17 will be described. FIG. 3 shows a configuration of the magnet unit 14 before the magnet unit 14 is fitted into the fitting holding portion 17. That is, the magnet unit 14
Before being fitted into the fitting holding portion 17, FIG.
As shown in FIG. 1A, a magnet cover 1 in which a joint 19a is fixed to an inner peripheral surface 18a of a permanent magnet 18 with an adhesive.
9 are on both side surfaces 18 of the permanent magnet 18.
b, 18c project outward. The length L1 of the protruding both sides 19b, 19c is set substantially equal to the thickness h1 of the permanent magnet 18. When the magnet unit 14 is fitted to and held by the fitting and holding portion 17, FIG.
As shown in (b), both sides 19 of the magnet cover 19
b, 19c are both side faces 17a, 17
b, and is bent along both side surfaces 17a and 17b while being in contact with the b. Then, when the magnet unit 14 is completely fitted in the fitting holding portion 17, both side portions 19b and 19c of the magnet cover 19 are just as shown in FIG. , 18c and come into pressure contact with both side surfaces 17a, 17b of the fitting holding portion 17.

Next, a method of manufacturing the magnet unit 14 will be described. As shown in FIG. 4, the permanent magnet 18, which has been sent in a direction P from the top to the position A and has a fan-shaped cross section and has an axial length of L0, is sent to a position B in an adhesive application step, and the position is In B, an adhesive is applied to the inner peripheral surface 18a. Then, the permanent magnet 18 coated with the adhesive is
It is sent from position B to position D in the bonding step along the P direction.

On the other hand, as shown in FIGS.
In the K direction perpendicular to the direction, the width L0 and the thickness h2
A non-magnetic metal thin plate (for example, stainless steel) 20 as a band-shaped (roll-shaped) flat plate (typically 0.1 to 0.2 mm) 20
From the position C to the position D so as to be positioned above the permanent magnet 18 along the K direction at a predetermined pitch. The length of the permanent magnet 18 in the axial direction and the width L0 of the non-magnetic metal sheet 20 are, as shown in FIG.
7 is set to be the same as the distance between both side surfaces 17c and 17d.

Then, at the position D, the non-magnetic metal thin plate 20 (the portion shown by a two-dot chain line in FIG. 5) located above the permanent magnet 18 is moved to the inner peripheral surface 1 of the permanent magnet 18.
8a is pressed against the inner peripheral surface 18a of the permanent magnet 18 by a molding adhesive jig 21 having the same arc-shaped press contact surface 21a as that of 8a. As a result, the portion of the non-magnetic metal thin plate 20 (that is, the coarse material of the magnet cover 19) is integrally bonded to the permanent magnet 18 by the adhesive applied to the inner peripheral surface 18a so as to cover the inner peripheral surface 18a. You.

Next, the portion of the permanent magnet 18 and the non-magnetic thin metal plate 20 (hereinafter, referred to as a coarse material of the magnet cover 19) which are formed and adhered at the position D are integrated along the K direction at the predetermined pitch. It is sent to the position E in the adhesive drying step. Then, at the position E, the adhesive interposed between the integrated permanent magnet 18 and the coarse material of the magnet cover 19 is dried. By this drying operation, the adhesive interposed between the coarse material of the permanent magnet 18 and the magnet cover 19 is solidified, and the coarse material of the magnet cover 19 is strongly fixed to the permanent magnet 18. At the same time, when another permanent magnet 18 is sent from the position B to the empty position D, and subsequently, the non-magnetic metal sheet 20 is sent from the position C so as to be above the permanent magnet 18, The following bonding operation is performed.

Similarly, when the coarse material of the permanent magnet 18 and the magnet cover 19 integrated at the position D is sent to the position E along the K direction at the predetermined pitch, the material is already located at the position E and dried. Integrated permanent magnet 18 and magnet cover 1
The coarse material of No. 9 is sent to the position F of the cutting step. Then, at the position F, the dried permanent magnet 18 and the magnet cover 1
The coarse material 9 is cut off from the continuous non-magnetic metal sheet 20 by the cutting device 22.

At a predetermined timing, the permanent magnet 18 is intermittently sent from the position B to the position D, and the non-magnetic metal sheet 20 is moved.
By intermittently sending in the K direction at a predetermined pitch,
The operations of the above steps can be performed continuously.

Therefore, according to the field device 11 of the present embodiment, the following features can be obtained. (1) In this embodiment, the magnet cover 19 for protecting the permanent magnet 18 is integrally bonded to the permanent magnet 18 with an adhesive. Then, when assembling, the permanent magnet 18 and the fitting holder 17 of the field holder 13 are assembled.

Therefore, as compared with the prior art in which the permanent magnet and the magnet cover are separately assembled to the field holder, the number of assembling steps can be reduced, and the assembling work becomes easier. As a result, the manufacturing cost of the field device 11 can be reduced.

(2) In this embodiment, the magnet cover 19
Is bonded to the permanent magnet 18 at the same time as the molding process. Accordingly, since it is not necessary to press the magnet cover 19 as a single item, the number of manufacturing steps of the field device 11, that is, the manufacturing cost can be reduced.

(3) In this embodiment, the magnet cover 19
Is a connecting portion 19 bonded to the inner peripheral surface 18a of the permanent magnet 18.
and a predetermined length L from both side surfaces 18b and 18c of the permanent magnet 18 before the magnet unit 14 is fitted to the field holder 13.
1, the magnet unit 14 is bent outward when the magnet unit 14 is fitted to the field holder 13, and is bent at both sides 18 b of the permanent magnet 18.
Both sides 19b and 19c are provided to cover 18c.

Therefore, as compared with the conventional case, the locking portions are provided on both sides 19b and 19c of the magnet cover 19 and the field holder 13
Since there is no need to provide an engaging portion or the like in the device, the number of manufacturing steps and manufacturing cost of the field device 11 can be reduced.

Further, both side portions 19b and 19c of the bent magnet cover 19 are connected to both side surfaces 17 of the fitting holding portion 17.
a, 17b, that is, the magnet unit 14 is reliably held by the field holder 13 even in the rotation direction of the field device 11 because of the elastic force urging the field holder 13.

(4) In this embodiment, the magnet unit 14
Is a step of applying an adhesive to the inner peripheral surface 18a of the permanent magnet 18; and pressing the magnet cover 19 against the inner peripheral surface 18a of the permanent magnet 18 to which the adhesive has been applied.
8a, and a drying step of solidifying an adhesive interposed between the integrated magnet cover 19 and the permanent magnet 18.

Therefore, the magnet cover 19 and the permanent magnet 18 are easily bonded by a series of continuous operations. as a result,
The magnet unit 14 to the field device 11 are easily manufactured. In addition, this embodiment may be changed as follows.

The operation of applying the adhesive to the permanent magnet 18 may be performed over two or more positions, and the drying operation and the cutting operation may be performed over two or more positions. In this case, the features (1) to (4) of the embodiment described above.
Can be obtained.

The drying operation position may be omitted by performing drying together with bonding. Alternatively, the bonding and drying operation may be omitted by using a rapid adhesive.
In this case, effects similar to the effects described in the features (1) to (4) of the above embodiment can be obtained.

○ Further, both side portions 19b of the magnet cover 19,
19c may be provided with a locking portion, and the fitting and holding portion 17 of the field holder 13 may be provided with an engaging portion corresponding to the locking portion. In this case, the features (1) and (2) of the above embodiment
Can be obtained.

In the above embodiment, the belt-shaped (roll-shaped) non-magnetic metal sheet 20 is continuously fed.
The non-magnetic thin metal plate 20 is previously adjusted to the size of the magnet cover 19 by one.
You may prepare and implement a sheet by sheet. At this time, the cutting operation may be omitted. In this case, the feature (1) of the above embodiment
The same effects as the effects described in (4) to (4) can be obtained.

In the above embodiment, the magnet cover 19 is formed of a stainless steel sheet as a non-magnetic metal sheet.
The magnet cover 19 may be formed of an aluminum thin plate as a non-magnetic metal thin plate or another thin plate. In this case, effects similar to the effects described in the features (1) to (4) of the above embodiment can be obtained.

In the above embodiment, the field holder 13 is made of synthetic resin. However, the field holder 13 may be made of another composite material. In this case, effects similar to the effects described in the features (1) to (4) of the above embodiment can be obtained.

In the above embodiment, the field holder 13 is provided with four fitting holding portions 17, and the magnet units 14 are fitted and held in the fitting holding portions 17, respectively. However, the field holder 13 has 5
One or more fitting holding parts 17 may be provided, and the magnet unit 14 may be fitted and held in each fitting holding part 17, that is, may be embodied in the motor 10 having five or more poles. In this case, effects similar to the effects described in the features (1) to (4) of the above embodiment can be obtained.

In the above embodiment, the inner peripheral surface 18a of the permanent magnet 18 is fixed to the magnet cover 19 with an adhesive.
Both sides 18b, 18c of the permanent magnet 18 are
The inner peripheral surface 18a of the permanent magnet 18 is formed by bending the two side portions 19b and 19c of the permanent magnet 18 into contact with each other.
9 and an adhesive to fix both sides 1 of the permanent magnet 18
8b and 18c may be implemented by being bonded to both sides 19b and 19c of the bent magnet cover 19 with an adhesive. In this case, effects similar to the effects described in the features (1) and (2) of the above embodiment can be obtained.

[0040]

As described in detail above, according to the first to third aspects of the present invention, the manufacturing cost of the field device can be reduced.

According to the fourth aspect of the invention, the magnet unit can be easily manufactured. According to the fifth aspect of the invention, the field device can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view of a field device of the present embodiment.

FIG. 2 is a sectional view of the field device taken along line tt in FIG. 1;

FIG. 3 is an explanatory view showing the fitting of a magnet unit constituting the field device.

FIG. 4 is an explanatory view showing a manufacturing process of the magnet unit.

FIG. 5 is a front view in the W direction of FIG. 4 showing the same manufacturing process of the magnet unit.

[Explanation of symbols]

Reference numeral 10: electric motor as a rotating device; 11: field device;
... field holder, 14 ... magnet unit, 15 ... yoke, 1
7: fitting holding portion, 18: permanent magnet, 18a: permanent magnet 1
8, inner peripheral surfaces, 18b, 18c ... both side surfaces of the permanent magnet 18,
19: Magnet cover, 19b, 19c: Both sides of magnet cover 19, 20: Non-magnetic thin metal plate as flat plate.

Claims (5)

[Claims] 1. A plurality of fitting holding portions (17) formed on a field holder (13) on which a yoke (15) is fitted.
In a field device of a rotating device fitted with a permanent magnet (18) whose inner peripheral surface (18a) and both side surfaces (18b, 18c) are covered by a magnet cover (19), the magnet cover (19) A field device for a rotating device, wherein the field device is fitted to a fitting holding portion (17) in a state of being bonded to the permanent magnet (18) with an adhesive. 2. The field device for a rotating device according to claim 1, wherein an inner peripheral surface (18a) of the permanent magnet (18) is adhered and fixed to the magnet cover (19) with an adhesive. A field device for a rotary device, wherein both side surfaces (18b, 18c) of a magnet (18) are formed by bending both side portions (19b, 19c) of the magnet cover (19) to abut. 3. A permanent magnet (18) and its permanent magnet (1).
8) Inner peripheral surface (18a) and both side surfaces (18b, 18c)
And a yoke (15) comprising a magnet cover (19) covering
In the magnet unit of the field device fitted to a plurality of fitting holding portions (17) formed on the field holder (13) to which the magnet is fitted, the magnet cover (19) comprises a permanent magnet (18). ) Is fixed to the inner peripheral surface (18a) by an adhesive. 4. A permanent magnet (18) and its permanent magnet (1).
8) Inner peripheral surface (18a) and both side surfaces (18b, 18c)
A method of manufacturing a magnet unit for a field device, comprising: a magnet cover (19) for covering an inner surface (18a) of the permanent magnet (18) with an adhesive applied to the inner surface (18a). After arranging the flat plates (20) so as to face each other, the flat plates (20) are pressed against the inner peripheral surface (18a) and the flat plates (20) are fixed to the permanent magnet (1).
8) A flat plate (20) bonded and fixed to the inner peripheral surface (18a) of the permanent magnet (18).
A portion protruding laterally from an inner peripheral surface (18a) of the slab, except that portions covering both side surfaces (18b, 18c) of the permanent magnet (18) are cut off. Method. 5. A permanent magnet (18) and its permanent magnet (1).
8) Inner peripheral surface (18a) and both side surfaces (18b, 18c)
A magnet unit comprising a magnet cover (19) covering
In a method of manufacturing a field device, a yoke (15) is fitted to a plurality of fitting holding portions (17) formed on a field holder (13) to which the permanent magnet (18) is fitted. An adhesive is applied to the inner peripheral surface (18a), and the flat plate (20) is disposed so as to face the inner peripheral surface (18a). Then, the flat plate (20) is attached to the inner peripheral surface (18a). The flat plate (20) is pressed against a permanent magnet (1
8) A flat plate (20) bonded and fixed to the inner peripheral surface (18a) of the permanent magnet (18).
The magnet unit (14) is cut by cutting a portion protruding laterally from the inner peripheral surface (18a) of the permanent magnet (18), leaving a portion covering both side surfaces (18b, 18c) of the permanent magnet (18). When (14) is fitted from the outside to the inside with respect to the fitting holding portion (17) of the field holder (13), the fitting is performed while bending portions covering the both side surfaces (18b, 18c). A method for manufacturing a field device, wherein the method comprises: