JPH0799745A - Rotor - Google Patents

Abstract

PURPOSE:To improve the productivity of a rotor and reduce the cost of a motor by a method wherein a rotor core is composed of the combination of a plurality of core components. CONSTITUTION:A rotor core 13 is composed of the combination of a center first core component 20 which has an approximately lozenge-shaped cross-section and an outer circumference second core component 21 which has an annular cross-section. The core components 20 and 21 are composed of a number of piled thin silicon steel plates 20a and 21a. In order to manufacture a rotor 12, four permanent magnets 15 are respectively bonded or welded to the outer surface of the first core component 20 and then the second core component 21 is mated with the permanent magnets 15 and fixed by bonding or welding. As a result, it is not necessary to insert the permanent magnets into housing parts 14 from the one end side of the core 13, so that a high accuracy is not required of the respective components of which the rotor 12 is composed. Further, a punching process by a press can be employed to manufacture the core components 20 and 21, so that the productivity can be improved and the cost of a motor can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor constituted by disposing a plurality of permanent magnets having an arc-shaped cross section inside a rotor core.

[0002]

2. Description of the Related Art As a motor equipped with this type of rotor,
The applicant of the present application has considered a structure as shown in FIG. 12 and applied for it (see, for example, Japanese Patent Application No. 5-124131).
In FIG. 12, a rotor 1 includes four arc-shaped housings 3 of a rotor core 2 in which four permanent magnets 4 each having an arc-shaped cross section are alternately arranged with N poles and S poles. The stator core 5 is configured by inserting and arranging
The stator core 5 is arranged in such a manner that the inner peripheral surface of the stator core 5 and a predetermined gap 6 are present therein. In this case, the respective permanent magnets 4 are arranged so that the respective convex portions 4 a side faces the center side of the rotor core 2. Reference numeral 7 is a rotary shaft fitted in a hole 8 formed in the center of the rotor core 2. The stator winding is omitted in FIG.

[0003]

By the way, when manufacturing the rotor 1, the rotor core 2 is manufactured first, and then the permanent magnets 4 are inserted into the housing 3 of the rotor core 2.
Must be inserted from one side. However, the process of inserting the permanent magnets 4 into the storage part 3 is quite difficult, and particularly when this process is performed by automatic assembly, accurate positioning is required for each, and therefore the assembly speed is increased. It is difficult to do so, and high dimensional accuracy is required for each part, and as a result, it is difficult to reduce the price of the motor.

Further, there is a problem that leakage of magnetic flux of the permanent magnet 4 is likely to occur, and air gap magnetic flux (magnetic flux in the air gap 6 between the rotor 1 and the stator 5) in the motor is reduced. Further, in the rotor core 2, the core portion existing between the inner peripheral surface of the permanent magnet 4 on the concave portion 4b side and the outer peripheral surface of the rotor core 2 (the gap 6 between the rotor core 1 and the stator core 5). Two
The ratio of a is large, and the magnetic flux due to the magnetic resistance of the iron core portion 2a reduces the magnetic flux in the air gap, which is a factor that hinders the improvement of the driving efficiency of the motor.

Therefore, the object of the present invention is to improve the manufacturability, to reduce the motor price, to reduce the leakage of the magnetic flux of the permanent magnet, and to increase the air gap magnetic flux in the motor. It is an object of the present invention to provide a rotor that can reduce loss and increase air gap magnetic flux in a motor.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a plurality of permanent magnets having an arc-shaped cross section are arranged inside a rotor iron core so that the respective convex portions face the center side of the rotor iron core. In the rotor configured as described above, the rotor core is configured by combining a plurality of core parts.

In this case, the plurality of core parts constituting the rotor core are the first core part arranged on the convex side of the permanent magnet and the second core part arranged on the concave side of the permanent magnet. It is good to compose from. The second iron core part can be composed of a plurality of iron core parts corresponding to each permanent magnet.

Further, it is preferable that the rotor iron core has a gap in the vicinity of the end of each permanent magnet.
Further, among the plurality of iron core parts, at least the iron core part arranged on the concave side of the permanent magnet is preferably configured by laminating a large number of thin iron plates. Furthermore, the rolling direction of the iron plate in the iron core component arranged on the concave side of the permanent magnet,
It is preferable that the magnetic orientation direction of at least the central portion of the permanent magnet is substantially the same.

[0009]

According to the above-mentioned means, since the rotor core is divided into a plurality of core parts, it becomes possible to incorporate the permanent magnets when combining the core parts.
When manufacturing the rotor, it is not necessary to insert a permanent magnet into the housing of the rotor core. Along with this, high precision is not required for each component, positioning, etc., and manufacturability can be improved.

When the rotor core is configured to have a gap near the end of each permanent magnet, the dimensional accuracy of each component can be afforded by the gap. Further, in the gap portion, the magnetic resistance of the leakage magnetic path between the adjacent permanent magnets (between the adjacent magnetic poles) becomes large, and as a result, the leakage of the magnetic flux can be reduced.

Further, an iron core component forming the rotor iron core is
When a large number of thin iron plates are laminated, punching by a press can be used, so that manufacturability can be improved.

Further, the rolling direction of the iron plate in the iron core part arranged on the concave side of the permanent magnet in the rotor iron core,
By making the magnetic orientation direction of at least the central portion of the permanent magnet substantially coincide with each other, the magnetic loss in the iron core component can be minimized.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 4 shows a schematic configuration of the motor 11. In FIG. 4, the rotor 1
The rotor core 13 has four arc-shaped storage portions 14 and four permanent magnets 15 each having an arc-shaped cross section.
Are housed and arranged so that the N poles and the S poles are alternated, and are arranged in the stator core 16 with the inner peripheral surface of the stator core 16 and a predetermined gap 17 present. . In this case, the respective permanent magnets 15 are arranged such that the respective convex portions 15 a side faces the center side of the rotor core 13. 1
Reference numeral 8 denotes a rotary shaft fitted in a hole 19 formed in the center of the rotor core 13. The stator winding is omitted in FIG.

Here, as shown in FIGS. 1 to 3, the rotor core 13 of the rotor 12 has a substantially diamond-shaped first core part 20 at the center (on the side of the protrusion 15a of the permanent magnet 15). And an annular second iron core component 21 on the outer peripheral portion (on the concave portion 15b side of the permanent magnet 15). The first and second iron core parts 20 and 21 are thin iron plates 20a, 2 made of a silicon steel plate.
It is configured by laminating a large number of 1a.

In the case of manufacturing such a rotor 12, first, four permanent magnets 15 are fixed to the outer surface side of the first iron core part 20 by bonding or welding, respectively, and then the second
The core parts 21 are manufactured by fitting them to each other and fixing them by adhesion or welding.

According to such a first embodiment, the rotor core 1
3 is divided into first and second iron core parts 20 and 21, and each permanent magnet 15 can be incorporated when the first and second iron core parts 20 and 21 are combined, so that the rotor 12 is At the time of manufacturing, it is not necessary to insert the permanent magnet 15 into the housing portion 14 of the rotor core 13 from one side. Along with this, dimensional accuracy of each component (the first and second iron core components 20 and 21, and the permanent magnet 15) forming the rotor 12 and positioning thereof are not required to be so high, and manufacturability is improved. Can be improved, which in turn can contribute to a reduction in motor price.

Further, the first and second iron core parts 20 and 21 constituting the rotor core 13 are constituted by laminating a large number of thin iron plates 20a and 21a made of silicon steel plates, respectively. Therefore, for manufacturing the first and second iron core parts 20 and 21, punching by a press can be used, and the manufacturability can be improved as compared with the cutting process and the dimensional accuracy of the parts can be increased.

FIG. 5 shows a second embodiment of the present invention, which is different from the above-mentioned first embodiment in the following points.
That is, a gap 22 is formed between the first iron core component 20 and the second iron core component 21 forming the rotor core 13 at a portion of the rotor 12 near the end of each permanent magnet 15. .

According to the second embodiment, by forming the gap 22, the dimensional accuracy of the first and second iron core parts 20 and 21 forming the rotor core 13 can be increased, which also allows the motor to have a dimensional accuracy. It will be possible to contribute to price reduction. In addition, the gaps 22 are formed by the adjacent permanent magnets 15,
Since the magnetic resistance of the leakage magnetic path between 15 (between adjacent magnetic poles) increases, the leakage of magnetic flux can be reduced as a result, and the air gap magnetic flux in the motor 11 can be increased.

6 to 8 show a third embodiment of the present invention, which is different from the first embodiment in the following points. That is, as shown in FIGS. 6 and 7, the rotor 12
The rotor iron core 23 in FIG. It is configured by combining with the second iron core part 25. And these 1st and 2nd iron core parts 2
4 and 25 are each formed by laminating a large number of thin iron plates 24a and 25a made of silicon steel plates.

As for the iron plate 25a constituting the second iron core component 25, as shown in FIG. 8, a long iron plate 2 made of a grain-oriented silicon steel sheet or a non-oriented silicon steel sheet is used.
6, the iron plates 25a are manufactured by punching with a press in the arrangement shown in FIG. 8 so that the iron plates 25a have the same conditions in the rolling direction A of the iron plate 26.

Further, as shown in FIG. 6, each permanent magnet 15 is magnetized so that the magnetic orientation directions B of the respective parts are parallel to each other. However, in this case, in the rotor 12, the magnetic orientation direction B in at least the central portion of each permanent magnet 15 is
And the rolling direction A of the iron plate 25a of the second iron core part 25 are substantially the same.

When manufacturing such a rotor 12, first, four permanent magnets 15 are fixed to the outer surface side of the first iron core part 24 by adhesion or welding, respectively, and then four second magnets are attached. Is manufactured by arranging the iron core component 25 of FIG. 1 so as to cover the permanent magnet 15 and fixing the iron core component 25 to the first iron core component 24 and the permanent magnet 15 by adhesion or welding.

According to such a third embodiment, in addition to the operational effects of the first embodiment, there are the following advantages. That is, in the rotor core 23, the concave portion 15 of the permanent magnet 15 is
Iron plate 25 in the second iron core part 25 arranged on the b side
By making the rolling direction A of a and the magnetic orientation direction B of at least the central portion of the permanent magnet 15 substantially coincide with each other, the magnetic resistance in each second iron core part 25 becomes small, and the magnetic loss there. Can be minimized. Along with this, the air gap magnetic flux in the motor 11 can be increased, which in turn can improve the motor drive efficiency.

9 and 10 show a fourth embodiment of the present invention, which is different from the above-mentioned third embodiment in the following points. That is, the rotor core 2 in the rotor 12
7 is configured by combining a first iron-core component 28 having a substantially rhombic shape in the central portion and four second iron-core components 29 arranged on the outer peripheral portion. In this case, the T-shaped protrusions 30 are provided at the four apexes of the first iron core part 28.
Is provided. Like the third embodiment, the first and second iron core parts 28 and 29 are also formed by laminating a large number of thin iron plates 28a and 29a made of silicon steel plates.

Further, in the rotor 12, each permanent magnet 1
5, the magnetic orientation direction B at least in the central portion, and the second
The iron plate 29a of the iron core part 29 is configured to substantially match the rolling direction A.

In the case of manufacturing such a rotor 12, first, four permanent magnets 15 are arranged on the outer surface side of the first iron core part 28 so as to be located between the protrusions 30, 30, respectively. Each is fixed by adhesion or welding. After that, the four second iron core parts 29 are arranged so as to cover the permanent magnets 15, and are bonded or welded to the first iron core parts 28 and the permanent magnets 15 to be manufactured.

According to such a fourth embodiment, in addition to the operational effects of the third embodiment, there are the following advantages. That is, since the T-shaped protrusion 30 is provided on the first iron core component 28, when the rotor 12 is manufactured, the protrusion 30 can be used for positioning the permanent magnet 15, which also improves manufacturability. Can be improved.

FIG. 11 shows a fifth embodiment of the present invention, which is different from the above-described fourth embodiment in the following points. That is, in the portion of the rotor 12 near the end of each permanent magnet 15, a gap 31 is formed between the protrusion 30 of the first iron core component 28 and the end of the second iron core component 29 that form the rotor iron core 27. To form.

According to the fifth embodiment, by forming the gap 31, the first and second iron core parts 28 and 29 constituting the rotor iron core 27 are formed as in the case of the second embodiment.
Since the dimensional accuracy can be afforded, and the magnetic resistance of the leakage magnetic path between the adjacent permanent magnets 15 and 15 (between the adjacent magnetic poles) in the gaps 31 becomes large, the leakage of the magnetic flux is consequently caused. You can do less.

[0031]

According to the rotor of the first aspect, since the rotor core is divided into a plurality of core parts, it becomes possible to incorporate each permanent magnet when combining the core parts. When manufacturing the rotor, it is not necessary to insert a permanent magnet into the housing of the rotor core. Along with this, high accuracy is not required for each component, positioning, etc., and manufacturability can be improved and the motor price can be reduced.

According to the rotor of the fourth aspect, the clearance is formed in the rotor core, so that the dimensional accuracy of each component can be increased, which also improves the manufacturability and improves the motor. It will be possible to contribute to price reduction. Further, since the magnetic resistance of the leakage magnetic path between the adjacent permanent magnets (between the adjacent magnetic poles) becomes large in the gap portion, the leakage of the magnetic flux can be reduced as a result, and the air gap magnetic flux in the motor can be increased. Become.

According to the rotor of the fifth aspect, the iron core component forming the rotor core is formed by laminating a plurality of thin plate-like iron plates. Can be improved.

According to the rotor of claim 6, the magnetic resistance of the iron core component arranged on the concave side of the permanent magnet is reduced, and the magnetic loss there can be reduced as much as possible. The air gap magnetic flux can be increased, and the motor driving efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a rotor showing a first embodiment of the present invention.

FIG. 2 is a plan view of a rotor

FIG. 3 is a plan view showing a state in which the components of the rotor are separated.

FIG. 4 is a sectional view of a motor

FIG. 5 is a view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 2 showing a third embodiment of the present invention.

FIG. 7 is a view corresponding to FIG.

FIG. 8 is a layout drawing when punching out an iron plate that constitutes a second iron core component.

FIG. 9 is a view corresponding to FIG. 2 showing a fourth embodiment of the present invention.

FIG. 10 is a view corresponding to FIG.

FIG. 11 is a view corresponding to FIG. 2 showing a fifth embodiment of the present invention.

FIG. 12 is a view corresponding to FIG. 4 showing a comparative example with respect to the present invention.

[Explanation of symbols]

12 is a rotor, 13 is a rotor core, 15 is a permanent magnet, 1
5a is a convex portion, 15b is a concave portion, 16 is a stator core, 20 is a first core part, 20a is an iron plate, 21 is a second core part, 21a is an iron plate, 22 is a gap, 23 is a rotor core, 2
4 is a first iron core component, 24a is an iron plate, 25 is a second iron core component, 25a is an iron plate, 27 is a rotor iron core, 28 is a first iron core component, 28a is an iron plate, 29 is a second iron core component, 29
a is an iron plate, 31 is a gap, A is a rolling direction, and B is a magnetic orientation direction.

Claims (6)

[Claims] 1. A rotor constituted by disposing a plurality of permanent magnets having an arc-shaped cross section inside a rotor core such that the respective convex portions of the permanent magnets face the center side of the rotor core. A rotor characterized in that the rotor core is formed by combining a plurality of core parts. 2. The plurality of core parts include a first core part arranged on the convex side of the permanent magnet and a second core part arranged on the concave side of the permanent magnet. The rotor according to claim 1, wherein 3. The rotor according to claim 2, wherein the second iron core part is composed of a plurality of iron core parts arranged on the concave side of each permanent magnet. 4. The rotor according to claim 1, 2 or 3, wherein the rotor core has a gap near the end of each permanent magnet. 5. The iron core component arranged at least on the concave side of the permanent magnet among the plurality of iron core components is constituted by laminating a plurality of thin iron plates.
Or the rotor described in 3. 6. The rotation according to claim 5, wherein the rolling direction of the iron plate in the iron core component arranged on the concave side of the permanent magnet and the magnetic orientation direction of at least the central portion of the permanent magnet are made substantially coincident with each other. Child.