JP2001037112A - Stator of magnet motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily, stably, and securely form a cylindrical core for improving motor efficiency by alternately laminating a thin magnetic steel plate whose both sides are coated with an adhesive and that whose sides are not coated with an adhesive, pressing in the direction of lamination for gluing and fixing each other to form the cylindrical core. SOLUTION: A magnet motor is composed of a stator 1 and a rotor that is paired with the motor, and the stator 1 is integrated by laminating a number of thin magnetic steel plates 16 where a cylindrical core 3 is formed and an electric wire is wound. In the number of thin magnetic steel plates 16, two types of magnetic steel plates, namely that coated with an adhesive in both the sides and that not coated with an adhesive, are prepared. When they are to be laminated, they are laminated and arranged alternately, are subjected to pressurization in a lamination direction, and are glued and integrated, thus forming the cylindrical core 3 and hence achieving firm fixation to the details, improving strength, preventing unneeded heat from being generated inside, reducing thermal loss, and improving motor efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a magnet motor or the like which is constructed by incorporating a rotor employing a permanent magnet into a stator and is used for driving a hermetic compressor or the like.

[0002]

2. Description of the Related Art An outline of a conventional magnet motor of this type will be described with reference to FIGS. 5A and 5B schematically show an example of a conventional magnet motor, wherein FIG. 5A is a longitudinal sectional view taken along line AA of FIG. 5B, and FIG. 5B is a cross section taken along line BB of FIG. FIG.

[0003] In the present specification, the magnet motor is composed of a stator and a rotor incorporating a permanent magnet paired with the stator.

[0004] As described above, the magnet motor 100 includes the stator 51 and the rotor 52. The structure thereof will be schematically described. First, the stator 51 includes a cylindrical core 53 formed by laminating a large number of magnetic steel plates. A plurality of slots 54 provided on the inner peripheral wall at predetermined intervals in the circumferential direction.
And a large number of electric wires 55 are wound around the slots 54.

On the other hand, the rotor 52 is provided with an iron core 56 formed by laminating a number of thin magnetic steel plates, and permanent magnet holes 56a at predetermined intervals in the circumferential direction of the iron core 56. A plurality (four in this example) of permanent magnets 57 are respectively buried in the hole 56a with the magnetic poles oriented in the circumferential direction.

At the center of the iron core 56, a rotary shaft hole 64 is provided, and the rotary shaft 58 is fixed through.
In addition, four rivet insertion holes 65 are provided around the rotary shaft hole 64 at positions between two adjacent permanent magnets 57.

The upper end plate 6 is provided at the upper end of the rotor 52.
1, a lower end plate 62 is provided at the lower end,
The permanent magnet 57 and the upper end plate 61 and the lower end plate 62 are integrated with each other by a rivet 63 inserted into the rivet insertion hole 65.

In the above-described configuration, the cylindrical core 53 of the stator 51 is formed by laminating a number of thin magnetic steel plates having a thickness of 0.35 to 0.5 mm. FIG. 5B and FIG.
FIG. 6 shows an enlarged cross section along the line CC of FIG.
An auto clamp 74 composed of a plurality (four in this example) of concave and convex portions spaced from the thin magnetic steel plate itself in the circumferential direction.
And means for press-fixing the thin plates with each other by the auto clamp 74.

As another method for fixing a large number of laminated thin magnetic steel sheets constituting the cylindrical core 53 of the stator 51, as shown in FIG. At several places on the side (four in this example)
A means is provided for extending in the laminating direction, applying a weld 75, and fixing.

[0010]

However, in the former type in which the thin plates are pressurized and fixed by the automatic clamp, the lines of magnetic force flowing through the magnetic steel plate are strongly turned by the irregularities of the automatic clamp during the operation of the magnet motor. Therefore, a heat generation phenomenon occurs here, which causes an increase in motor loss.

In the latter type, in which the magnetic steel sheets are fixed to each other by performing welding extending in the laminating direction on the outer cylindrical surface of the cylindrically laminated core, an eddy current is generated in the welded portion, and this causes the As a result, the loss increases, and the motor efficiency is deteriorated as in the former case.

The present invention solves the above-mentioned problems that occur when a thin magnetic steel plate is fixed to form a cylindrical core in a conventional magnet motor, and a cylindrical core that improves motor efficiency can be easily provided. SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnet motor stator that can be formed stably and reliably.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. As a first means, there is provided a magnet motor in which a large number of thin magnetic steel sheets are laminated to form a cylindrical core. In the stator, the thin magnetic steel sheet is formed by alternately laminating one having an adhesive applied to both sides and one having no adhesive applied thereto, and pressing and adhering to each other to form a cylindrical core by pressing in the laminating direction. The present invention provides a magnet motor stator as described above.

That is, according to the first means, the thin magnetic steel sheet is bonded and fixed by applying an adhesive arranged every other sheet to integrate the cylindrical core.
While being firmly fixed over the details to improve the strength,
There is no fear of unnecessary heat generation inside, and heat loss is reduced to improve motor efficiency.

Further, the present invention provides, as a second means, the first means.
In the means, the thin magnetic steel sheet is formed by applying a plurality of semicircular cutouts at predetermined intervals on the outer peripheral portion instead of employing pressure coated adhesive on both surfaces and applying pressure bonding. Provided is a magnet motor stator having a cylindrical core formed by press-fitting resin-based rivets into a plurality of rivet holes formed by laminating provided thin magnetic steel plates and fixing the laminated magnetic steel plates. It is.

That is, according to the second means, a resin-based rivet is press-fitted into a rivet hole formed by laminating a large number of magnetic steel plates, and the laminated magnetic steel plates are fixed, and a cylindrical core is formed. Since they are integrated, no eddy current is generated along the resin-based rivet used here, and the eddy current on the outer surface of the cylindrical core is reduced to improve the motor efficiency.

Further, the present invention provides, as a third means, the first means.
In the means, the thin magnetic steel sheet employs a material coated with a molten adhesive on both surfaces instead of using a material coated with an adhesive on both surfaces and applying pressure bonding instead of applying pressure bonding. An object of the present invention is to provide a stator for a magnet motor in which a cylindrical core is formed by melting an adhesive and bonding and fixing each other.

That is, according to the third means, the molten adhesive applied to the thin magnetic steel sheets arranged alternately is melted in an annealing furnace, and the individual magnetic steel sheets are covered in detail. In order to improve the strength of the motor, there is no possibility of unnecessary heat generation inside, and the heat loss is reduced to improve the motor efficiency.

Furthermore, the present invention provides, as a fourth means, a stator of a magnet motor in which a large number of thin magnetic steel sheets are laminated to form a cylindrical core, wherein the cylindrical core has the following three configurations: (1) The thin magnetic steel sheet is formed by alternately laminating those having both sides coated with an adhesive and those not having the adhesive applied, and by pressing in the laminating direction to adhere and fix each other to form a cylindrical core. (2) A resin rivet is press-fitted into a plurality of rivet holes formed by laminating thin magnetic steel plates provided with a plurality of semicircular notches at predetermined intervals in the outer peripheral portion. The laminated magnetic steel sheets are fixed to form a cylindrical core; (3) The thin magnetic steel sheets alternately include those having both sides coated with a molten adhesive and those not coated with a molten adhesive. After laminating, the molten adhesive is melted in an annealing furnace and There is provided any two or the three magnet motor stator comprising comprising combined structure in; fixed to form a cylindrical core.

That is, according to the fourth means, since at least two or more of the above-described first to third means are provided in combination, a large number of thin magnetic steel sheets can be more firmly and more strongly. The motor is appropriately integrated, and unnecessary heat generation is suppressed to improve the motor efficiency.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a partial cross section along the line DD of FIG. 4 on the side surface of the stator in the present embodiment, FIG. 2 shows a plane of the cylindrical core, FIG. 3 shows a cross section of a part of the cylindrical core, and FIG. 4 shows a horizontal section of the magnet motor.

That is, in the present embodiment, the magnet motor 100 is composed of a stator 1 and a rotor 2 which is paired with the stator 1. In this, the stator 1 is formed by laminating and integrating a number of thin magnetic steel plates 16 into a cylindrical shape. The core 3 is formed into a shape, and the wire 5 is wound around the core 3 through a predetermined path to complete the process.

In order to integrate the large number of thin magnetic steel plates 16, in the present embodiment, as shown in FIG. 2, a plurality of portions (90 in this example) are provided on the outer periphery of each magnetic steel plate 16 at a predetermined interval. A resin-based rivet hole 16a formed by a semicircular notch is provided at four locations (at intervals of °), and a large number of the magnetic steel plates 16 are gathered to extend in the stacking direction on the outermost shell of the cylindrical core 3 formed by stacking. The resin-based rivets 20 are press-fitted into four semicircular resin-based rivet holes 16a formed as described above to fix and integrate the plurality of laminated thin magnetic steel plates 16 described above.

The thin magnetic steel plates 16 are
As shown in FIG. 3, two types are prepared, one having the adhesive 17 applied to both sides and the other not having the adhesive 17 applied. When laminating, these are alternately laminated and arranged, and laminated by an appropriate pressing means. The cylindrical core 3 may be formed by applying pressure in the direction and bonding and integrating.

Further, instead of applying the adhesive 17, as shown in FIG.
Prepare two types, one coated with the molten adhesive 18 on both sides, and the other not coated. After alternately laminating them, put them in an annealing furnace, set them at a predetermined temperature, and anneal them. The magnetic steel plates 16 that have been melted and laminated may be bonded to form the integrated cylindrical core 3.

The adhesive 17 is non-conductive,
In addition, since it is necessary to be able to withstand the heat generated during operation of the finished product, a resin-based adhesive is appropriate.
Preferably, the molten adhesive 18 is selected from those suitable for the annealing process (about 800 ° C., one day or more) employed in the process of manufacturing the motor.

In the present embodiment, the magnetic steel plates 16 are integrated to form the cylindrical core 3 as described above. At this time, the cylindrical core 3 formed by laminating the magnetic steel plates 16 is formed. A plurality of resin-based rivet holes 16 formed in the outer shell
Since a large number of magnetic steel plates 16 are integrated by press-fitting the resin-based rivet 20 into a, no eddy current is generated in the insertion direction of the non-conductive resin-based rivet 20, so that the eddy current is not generated. The loss has been reduced, and an improvement in motor efficiency has been achieved.

When a large number of laminated magnetic steel plates 16 are bonded and integrated by an adhesive 17 applied to both surfaces of the magnetic steel plates 16, the laminated individual magnetic steel plates 16 are firmly secured in detail. And the strength of the cylindrical core 3 can be improved, and the magnetic steel plate 16 has no irregularities such as an auto-clamp. As a result, the motor efficiency was improved by reducing the loss.

When the molten adhesive 18 is employed, the molten adhesive 18 applied to both surfaces of the magnetic steel plate 16 is used.
Are melted in an annealing furnace prepared separately, and the individual magnetic steel plates 16 are melted.
Is firmly adhered and fixed over the details, so that the strength of the cylindrical core 3 is improved, and since there is no need to form an uneven portion on the magnetic steel plate 16, heat generation inside the cylindrical core 3 is reduced. Thus, heat loss was reduced and motor efficiency was improved.

Here, as a configuration in which a large number of magnetic steel plates 16 are integrated to form a strong cylindrical core 3, a resin-type rivet hole 16a and a resin-type rivet 20 are press-fitted.
The three forms of the application of the adhesive 17 on the surface of the magnetic steel sheet 16 and the application of the molten adhesive 18 on the surface of the magnetic steel sheet 16 have been described in parallel, but these may be employed independently of each other. Needless to say, any two of them may be selected and adopted together, or all three may be adopted together.

Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to such embodiments.
It goes without saying that various changes may be made to the specific structure within the scope of the present invention.

For example, although the description has been given of the stator of the magnet motor here, the invention is not necessarily limited to the magnet motor alone, and can be applied as a stator of a motor that does not employ a permanent magnet for the rotor. It is.

[0033]

As described above, according to the invention of claim 1 of the present application, in a stator of a magnet motor in which a large number of thin magnetic steel sheets are laminated to form a cylindrical core, the thin magnetic steel sheets are The one with the adhesive applied to both sides and the one without the adhesive are alternately laminated, and pressed in the laminating direction to adhere and fix each other to form a cylindrical core. The steel plate is bonded and fixed by applying an adhesive placed every other sheet, and by integrating the cylindrical core, it is firmly fixed over the details and achieves strength improvement, and it is unnecessary inside It is possible to obtain a suitable magnet motor stator that achieves an improvement in motor efficiency by reducing heat loss without generating heat.

According to the second aspect of the present invention, the stator of the magnet motor is formed by laminating thin magnetic steel plates having a plurality of semicircular notches provided at predetermined intervals on the outer peripheral portion. A resin-based rivet is press-fitted into a plurality of rivet holes to be formed, and a laminated magnetic steel plate is fixed to form a cylindrical core. No eddy current is generated, and the eddy current on the outer surface of the cylindrical core is reduced, so that a suitable magnet motor stator having improved motor efficiency can be obtained.

According to the third aspect of the present invention, in the magnet motor stator, the thin magnetic steel sheets are alternately laminated with both sides coated with a molten adhesive and those not coated with a molten adhesive. Then, the molten adhesives are melted in an annealing furnace and bonded and fixed to each other to form a cylindrical core, so that the thin magnetic steel sheets are applied to the alternately arranged magnetic steel sheets. The agent is melted in the annealing furnace, and the individual magnetic steel sheets are firmly fixed in detail to achieve strength improvement, and there is no risk of unnecessary heat generation inside, reducing heat loss and improving motor efficiency Thus, it is possible to obtain a suitable magnet motor stator achieving the above.

Further, according to the invention described in claim 4,
In the stator of the magnet motor, a cylindrical core is formed by combining any two or three of the claims 1 to 3, so that a large number of thin magnetic steel sheets are more firmly It is possible to obtain a suitable magnet motor stator that achieves improved motor efficiency by integrating more appropriately and without generating unnecessary eddy current or heat generation.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a stator of a magnet motor according to an embodiment of the present invention, taken along line DD of FIG.

FIG. 2 is a plan view of a cylindrical core constituting the stator of FIG. 1;

FIG. 3 is a sectional view showing a part of a cylindrical core employed as an extended application example of the embodiment of FIG. 1;

FIG. 4 is a horizontal sectional view of a magnet motor incorporating the stator of the embodiment of FIG. 1;

FIG. 5 schematically shows an example of a conventional magnet motor,
(A) is a longitudinal sectional view along the AA line of (b), and (b) is a transverse sectional view along the BB line of (a).

FIG. 6 is an enlarged sectional view taken along line CC of FIG. 5;

FIG. 7 is a plan view of a cylindrical core constituting a stator of the magnet motor of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 3 Core 5 Electric wire 8 Rotation axis 16 Magnetic steel plate 16a Resin rivet hole 17 Adhesive 18 Melt adhesive 20 Resin rivet 51 Stator 52 Rotor 53 Cylindrical core 54 Slot 55 Electric wire 56 Iron core 56a Permanent magnet hole 57 permanent magnet 58 rotating shaft 61 upper end plate 62 lower end plate 63 rivet 64 rotating shaft hole 65 rivet insertion hole 74 auto clamp 75 welding 100 magnet motor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H002 AA10 AB01 AC07 5H615 AA01 BB01 BB07 BB14 PP01 PP06 QQ02 SS44 TT03 TT27 TT31 5H621 GA01 GA04 GB10 HH01 JK01

Claims (4)

[Claims] 1. A stator for a magnet motor in which a large number of thin magnetic steel sheets are laminated to form a cylindrical core, wherein the thin magnetic steel sheets are obtained by applying an adhesive to both surfaces and applying an adhesive. 1. A stator for a magnet motor, wherein a cylindrical core is formed by alternately laminating non-existent components and pressing them in the laminating direction to adhere and fix each other. 2. The thin magnetic steel sheet according to claim 1, wherein a plurality of semicircular notches are provided at predetermined intervals on the outer peripheral portion, instead of employing a magnetic steel sheet coated with an adhesive on both sides and pressure bonding. A resin-made rivet is press-fitted into a plurality of rivet holes formed by laminating thin magnetic steel plates provided with portions, and the laminated magnetic steel plates are fixed to form a cylindrical core. Item 2. A stator of the magnet motor according to item 1. 3. The thin magnetic steel sheet, in which an adhesive is applied on both sides, and instead of pressure bonding, a thin magnetic steel sheet is applied with a molten adhesive on both sides. 2. The stator for a magnet motor according to claim 1, wherein the molten adhesive is melted and bonded and fixed to each other to form a cylindrical core. 4. A stator for a magnet motor in which a large number of thin magnetic steel sheets are stacked to form a cylindrical core, wherein the cylindrical core has the following three configurations: (1) The thin magnetic steel sheet Is formed by alternately laminating those having both sides coated with an adhesive and those not coated with an adhesive, pressing in the laminating direction to adhere and fix each other to form a cylindrical core; A plurality of thin magnetic steel sheets provided with a plurality of semicircular cutouts at predetermined intervals are laminated to form a plurality of rivet holes. (3) The thin magnetic steel sheet is formed by alternately laminating a thin magnetic steel sheet having both sides coated with a molten adhesive and a layer not coated with the molten adhesive, and performing the fusion bonding in an annealing furnace. Melting the agents and gluing them together to form a cylindrical core; Characterized by comprising any two or any of the above three configurations.