JPH05219669A - Permanent magnet type rotor - Google Patents

Abstract

PURPOSE:To provide a permanent magnet type rotor in which a shearing stress concentrated at a coupling part of an outer peripheral ring to a coupler is alleviated or absorbed, and deformation of the rotor, damage the coupling part of the ring to the coupler are eliminated. CONSTITUTION:The permanent magnet type rotor has an opening 1 for inserting a permanent magnet, a rotor core laminate 2 having an opening 11 for a rotary shaft, and a permanent magnet 3 inserted into the opening 1 for inserting the magnet. The opening l has an outer peripheral ring 7 for forming an outer peripheral frame of the opening 1, and a coupling part 9 for connecting the outer periphery of a yoke 8 formed in the opening 1 to the yoke 8 of the ring 7. A circular-arclike recess 4 is formed on an inner peripheral surface of the ring 7 for forming the outer peripheral frame of the opening 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type rotor having a motor rotor provided with a permanent magnet.

[0002]

2. Description of the Related Art Conventionally, as a permanent magnet used for a rotor of a motor, as shown in FIG. 13, a large number of disc-shaped rotor core punched plates having a plurality of openings 1 in the vicinity of the outer periphery thereof are laminated. The laminated body 2 is formed, and the opening portion 1 includes an outer peripheral ring portion 7 forming an outer peripheral frame of the opening portion 1, a yoke portion 8 formed inside the opening portion, an outer peripheral ring portion 7 and a yoke portion 8. The permanent magnets 3 are formed by the connecting portions 9 that connect them.
Trying to hold.

However, in the permanent magnet type rotor having such a structure, the permanent magnet 3 is rotated when the rotor rotates at a high speed.
Due to the centrifugal force generated in the above, shear stress is concentrated on the joint portion between the outer peripheral ring portion 7 and the connecting portion 9, and the entire rotor may be deformed or the joint portion between the outer peripheral ring portion 7 and the connecting portion 9 may be broken. there were.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the shear stress concentrated on the connecting portion between the outer peripheral ring portion and the connecting portion is reduced or absorbed to prevent the deformation of the rotor and the breakage of the connecting portion between the outer peripheral ring portion and the connecting portion. The object is to provide a permanent magnet type rotor that does not have a permanent magnet.

[0005]

In order to solve the above-mentioned problems, in the first invention, a large number of disc-shaped rotor core punched plates having a plurality of openings for inserting permanent magnets in the vicinity of the outer periphery are laminated. In the permanent magnet rotor in which the rotor core laminated body is formed by inserting the permanent magnet into the permanent magnet insertion opening, the inner peripheral surface of the outer peripheral ring portion forming the outer peripheral frame of the opening or the outer periphery of the permanent magnet. In the second invention, a circular arc-shaped recess is formed on at least one of the surfaces, and in the second invention, a part of the partition for partitioning the permanent magnet in the circumferential direction is formed at least inside the opening or the yoke or the opening. A rotor core blank is formed by using a protruding portion protruding from at least one of the outer peripheral ring portions forming the outer peripheral frame, and the other portion serving as a connecting portion that connects the outer peripheral ring portion and the yoke portion. The protruding part and the connecting part will overlap alternately. It has a configuration formed by laminating shifting.

[0006]

When the arcuate concave portion is formed on the inner peripheral surface of the outer peripheral ring portion and when the arcuate concave portion is formed on the outer peripheral surface of the permanent magnet, the outer peripheral ring and the permanent magnet are near the center in the circumferential direction. Is eliminated, the large moment of inertia acting from the center of the outer ring portion to the connecting portion of the outer ring portion and the connecting portion due to the centrifugal force generated when the rotor rotates at high speed is eliminated, and the shear stress at the connecting portion is reduced. You can

Further, a part of the partitioning part in the circumferential direction of the permanent magnet is a projecting part projecting from at least one of the yoke part and the outer peripheral ring part, and the other part is a connecting part connecting the outer peripheral ring part and the yoke part. If the rotor core punching plates are formed and the rotor core punching plates are stacked so that the protruding portions and the connecting portions are alternately overlapped with each other, the position of the connecting portion differs for each rotor core punching plate, so that the connecting portion The shear stress generated in the rotor is dispersed, the shear stress is not concentrated, and the rotor is not deformed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a permanent magnet type rotor according to the present invention, and shows a plan view of the permanent magnet type rotor, which is a rotor core obtained by punching an iron plate. The punched plates are formed by stacking them one by one while crimping them, and the permanent magnet insertion opening 1 and the rotary shaft opening 11 are formed.
And a permanent magnet 3 inserted into the permanent magnet insertion opening 1. The permanent magnet insertion opening 1 connects the outer peripheral ring portion 7 forming the outer peripheral frame of the opening 1, the outer periphery of the yoke portion 8 formed inside the opening 1, the outer peripheral ring portion 1, and the yoke portion 8. It is formed by the connecting portion 9. In this embodiment, an arcuate recess 4 is formed on the inner peripheral surface of the outer peripheral ring portion 7 forming the outer peripheral frame of the opening 1. Specifically, the concave portion 4 is formed so as to spread in an arc shape from the central portion of the outer peripheral ring portion to the connecting portions 9 on both sides, and when the permanent magnet rotor 4 is assembled, the arc shaped opening is formed in the axial direction. It is formed so as to communicate with each other.

In the permanent magnet type rotor according to the present invention, although not shown, end plates having the same diameter as the rotor core punched plate are provided above and below the rotor in order to prevent the permanent magnet from coming off and falling. It is attached when the rotor is assembled to complete the permanent magnet rotor.

On the other hand, FIG. 2 shows an application example of the first embodiment. Contrary to the first embodiment, an arc-shaped recess 5 is formed on the outer peripheral surface of the permanent magnet 3. is doing. Also in this case, the recess 5 is formed so as to spread in an arc shape from the central portion of the permanent magnet to the connecting portions 9 on both sides, and when the permanent magnet rotor 4 is assembled, the arc opening communicates in the axial direction. Is formed.

According to the permanent magnet type rotor constructed as described above, since there is no contact between the outer peripheral ring portion and the permanent magnet in the vicinity of the center in the circumferential direction, the outer peripheral ring portion due to centrifugal force generated when the rotor rotates at a high speed. A large moment of inertia acting on the connecting portion between the outer peripheral ring portion and the connecting portion is eliminated from around the center, and the shear stress at the connecting portion can be reduced. Therefore, according to this embodiment, it is possible to prevent the deformation of the rotor and the breakage of the outer peripheral ring portion and the connecting portion.

Further, in this embodiment, since the arcuate openings are formed so as to communicate with each other in the axial direction, when the rotor is mounted on the hermetic compressor, as shown in FIG. If the small holes 18 are formed in the end plate 17 so as to correspond to the arc-shaped openings 12 in advance, the arc-shaped openings 12 and the small holes 18 of the end plate can also function as gas vent holes. .. In this case, as shown in the drawing, if the oil separating disk 6 is arranged substantially parallel to the upper end surface of the rotor, it is possible to prevent a decrease in the amount of lubricating oil discharged.

When it is desired to form only the gas vent hole, a notch 13 that vertically communicates with the side surface of the permanent magnet may be formed, as shown in FIGS. In this case, since the notch 13 is formed on the inner side surface of the permanent magnet and the gas vent hole is on the inner side as compared with FIG. 3, the oil separating action of the oil separating disk 6 is enhanced, and the lubricating oil discharge amount is increased. It can be further reduced.

FIG. 6 shows a second embodiment of the permanent magnet type rotor according to the present invention, and shows a plan view of a rotor core punched plate which constitutes the permanent magnet type rotor. This is an iron plate punched and provided with a permanent magnet insertion opening 1 and a rotary shaft opening 11. The permanent magnet insertion opening 1 has an outer peripheral ring portion 7 forming an outer peripheral frame of the opening 1.
And the outer periphery of the yoke portion 8 formed inside the opening 1,
The yoke portion 8 formed inside the opening portion 1 and the protruding portion 1 protruding from the outer peripheral ring portion 7 forming the outer peripheral frame of the opening portion 1.
4 and a connecting portion 9 that connects the outer peripheral ring portion 7 and the yoke portion 8. Further, in this embodiment, the rotor core punched plate formed in this way has a structure in which the projecting portions 14 and the connecting portions 9 are stacked so as to be alternately superposed as shown in FIG.

Since the four-pole electric motor is used in this embodiment, the connecting portions 9 are provided at two diametrically opposite positions,
Protrusions 14 are provided at the other two places, and rotor core punched plates are laminated on four permanent magnets by shifting them by 90 degrees.

Next, the operation of the permanent magnet type rotor thus constructed will be described. Generally, in a permanent magnet type rotor, a gap in assembling occurs between the permanent magnet and the permanent magnet insertion opening 1 of the rotor core punched plate. This gap is absorbed to some extent due to the displacement of the punched plates when stacking the punched plates, but centrifugal force is applied to the permanent magnets during high-speed rotation, and the gap that cannot be absorbed by the stacking moves outward and moves to the outer circumference. It comes into contact with the ring portion 7 and pushes it.

Along with this, the contact portion of the permanent magnet is deformed, and the shear stress concentrates on the connecting portion in the vicinity thereof. In the conventional permanent magnet type rotor, there is a risk that the connecting portion may be broken due to the concentration of shear stress, but in the present embodiment, each connecting plate has a connecting portion and a protruding portion where this connecting portion is partially missing. However, since the positions of the connecting portion and the protruding portion are alternately overlapped and different, the deformation of the outer peripheral ring portion is not constant and is dispersed together with the shear stress, so that stress concentration is avoided and deformation of the rotor is eliminated. Further, the leakage flux passing through the connecting portion is also halved because the connecting portion is halved, and the performance and efficiency of the stator can be improved. Furthermore, since the weight is also reduced by halving the connecting portion, the performance and efficiency can be improved and the cost can be reduced.

The protruding portion 14 may be provided on either the yoke portion 8 side or the outer peripheral ring portion 7 side,
In FIG. 8, the protruding portion 14 is formed only on the yoke portion 8 formed inside the opening 1, without forming the protruding portion on the side of the outer peripheral ring portion 7 where leakage magnetic flux is likely to occur.

In the permanent magnet rotor constructed as described above, the yoke portion 8 formed inside the opening 1 and the opening 1 are formed.
The protrusions 14 are formed on both of the outer peripheral ring portions 7 forming the outer peripheral frame
Compared with the case of providing, the leakage flux is less generated and the weight is reduced, so that the performance and efficiency can be improved.

In addition, in the second embodiment, one blank is used.
Although the sheets are alternately staggered by 90 degrees and stacked, it is not always necessary to stagger and stack the sheets one by one, and a plurality of sheets may be staggered and stacked. Further, a plurality of types of punched plates having different numbers of connecting portions and protruding portions may be staggered and stacked, and the staggered angles of the punched plates can be variously changed according to the number of poles and the like.

Furthermore, in the second embodiment, since the blanks are alternately shifted by 90 degrees and laminated,
It is possible to partition the permanent magnets individually without forming the protruding portion on either the yoke portion 8 or the outer peripheral ring portion 7. In this case as well, the generation of leakage magnetic flux is small and the weight is also reduced. Performance and efficiency can be improved.

Further, in the permanent magnet type rotor in which permanent magnets having different polarities are adjacent to each other as in the first and second embodiments, as shown in FIG. There is a drawback that the magnetic flux is short-circuited and the effective magnetic flux is reduced. In order to reduce the influence of such a short circuit magnetic flux, the thickness of the outer peripheral ring portion may be made as small as possible. In this case, as shown in FIG. 10, the outer peripheral ring portion 7 of the rotor core punching plate is punched out. At the time of deformation, the outer circumference of the rotor becomes uneven and the shape accuracy is not sufficiently obtained, the gap accuracy between the rotor 15 and the stator 16 is deteriorated, and as a result, the thickness of the outer peripheral ring portion 7 cannot be reduced so much that the motor is The characteristics will be reduced.

Therefore, the permanent magnet rotor of this embodiment is
As shown in FIG. 11, the thickness of the outer peripheral ring portion 7 at the time of punching the rotor core punched plate is set to several millimeters so as not to be deformed. As shown in FIG. 12, the shape accuracy of the outer periphery of the rotor 15 is improved by cutting the outer periphery of the rotor 15, the thickness of the outer peripheral ring portion 7 is reduced to 2 mm or less, and the motor characteristics are improved.

Further, by cutting the outer periphery after laminating the rotor core blanks in this manner, variations in rotor assembly due to deformation of the blanks can be eliminated and the yield can be improved, so that high productivity and low cost rotation can be achieved. Can provide a child.

[0026]

According to the present invention, an arcuate concave portion is formed on the inner peripheral surface of the outer peripheral ring portion, an arcuate concave portion is formed on the outer peripheral surface of the permanent magnet, and the partition portion in the circumferential direction of the permanent magnet is formed. A rotor core punched plate is formed by using a part of the rotor core or the outer peripheral ring part as a protruding part and another part as a connecting part connecting the outer peripheral ring part and the yoke part. Since the protruding parts and the connecting parts are staggered so that they overlap with each other, it is possible to reduce or absorb the shear stress concentrated in the connecting part of the outer peripheral ring part and the connecting part, and the deformation of the rotor and the connecting of the outer peripheral ring part and the connecting part. It is possible to prevent breakage of parts.

[Brief description of drawings]

FIG. 1 is a plan view of a rotor core laminated body of a permanent magnet type rotor according to a first embodiment of the present invention.

FIG. 2 is a plan view of a rotor core laminated body showing an application example of the permanent magnet rotor according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a hermetic compressor showing a positional relationship between the permanent magnet rotor and an oil separation disk.

FIG. 4 is a cross-sectional view of a hermetic compressor showing an arrangement relationship between a permanent magnet rotor provided with a notch for a gas vent hole and an oil separation disk.

FIG. 5 is a perspective view showing a permanent magnet of a permanent magnet type rotor provided with a notch for a gas vent hole.

FIG. 6 is a plan view of a rotor core punched plate of a permanent magnet type rotor according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a method of stacking rotor core blanks according to a second embodiment of the present invention.

FIG. 8 is a plan view of a rotor core blank showing an application example of a permanent magnet rotor according to a second embodiment of the present invention.

FIG. 9 is a diagram showing effective magnetic flux and short-circuit magnetic flux of the permanent magnet rotor according to the present invention.

FIG. 10 is a diagram showing a laminated state when the thickness of the outer peripheral ring portion of the rotor core punched plate of the permanent magnet rotor is reduced.

FIG. 11 is a diagram showing a laminated state of the outer peripheral ring portion when the rotor core punched plates according to the present invention are laminated.

FIG. 12 is a diagram showing a laminated state of an outer peripheral ring portion formed by cutting the outer periphery of a rotor core punched plate according to the present invention after laminating.

FIG. 13 is a perspective view of a conventional permanent magnet rotor.

[Explanation of symbols]

1 ... Opening for inserting permanent magnet, 2 ... Rotor core laminated body, 3
... permanent magnet, 4 ... recessed part, 5 ... recessed part, 6 ... oil separating disk, 7 ... outer peripheral ring part, 8 ... yoke part, 9 ... connecting part, 1
3 ... notch, 14 ... protrusion.

Continued Front Page (72) Tadashi Omura Tadashi Omura, 336 Tatehara, Fuji City, Shizuoka Prefecture Toshiba Fuji Factory (72) Inventor Shigemi Nagatomo 336 Tatehara, Fuji City, Shizuoka Prefecture Fuji Factory (72) Inventor Onoda Izumi, 336 Tatehara, Fuji City, Shizuoka Prefecture, Toshiba Fuji Factory (72) Inventor Hideaki Tsuchiyama 336, Tatehara, Fuji City, Shizuoka Prefecture, Toshiba Corporation, Fuji Factory

Claims (2)

[Claims] 1. A rotor core laminated body is formed by stacking a large number of disc-shaped rotor core punched plates having a plurality of openings for inserting permanent magnets in the vicinity of the outer periphery thereof, and the rotor core laminated body is formed in the permanent magnet insertion opening. In the permanent magnet rotor in which the permanent magnet is inserted, a recess is formed along the circumferential direction on at least one of the inner peripheral surface of the outer peripheral ring portion forming the outer peripheral frame of the opening or the outer peripheral surface of the permanent magnet. Characteristic permanent magnet type rotor. 2. A rotor core laminated body is formed by laminating a plurality of disc-shaped rotor core punched plates having a plurality of openings for inserting permanent magnets in the vicinity of the outer periphery, and the rotor core laminated body is formed in the permanent magnet insertion opening. In a permanent magnet type rotor into which a permanent magnet is inserted, a part of a partitioning section for partitioning the permanent magnet in the circumferential direction forms a yoke section formed inside the opening or an outer peripheral ring section forming an outer peripheral frame of the opening. A rotor core punched plate which is a projecting part projecting from at least one of the other parts, and the other part is a connecting part which connects the outer peripheral ring part and the yoke part. A permanent magnet rotor characterized in that the connecting portions are laminated so as to be alternately superposed.