JP2000188837A - Permanent magnet rotor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a permanent magnet rotor that can withstand high-speed rotation and has improved circularity and perpendicularity by providing a pipe for preventing the a permanent magnet and a rotor core from being scattered at the outer periphery of the rotor core. SOLUTION: A rotor core is divided into a core 12 at the inner-periphery side of a permanent magnet 11 and a core 13 at the outer-periphery side and is formed by press-fitting or fire-fitting a pipe 14 for preventing the rotor core from being scattered at the outer periphery of the rotor core. An end plate 14t that is formed integrally with the pipe 14 for preventing the rotor core from being scattered by drawing and an individual end plate 15 are provided at both the ends of the axial direction of the rotor core and are fixed by a caulking pin 16. Also, since there is a gap 18 between the core 13 at the outer- periphery side and the core 12 at the inner-periphery side of the outer-periphery part of the rotor core, rotor magnetic flux cannot be short-circuited. Also, eve if the rotor core is divided, there is the pipe 14 for preventing the rotor core from being scattered at the outer-periphery part of the rotor, thus withstanding centrifugal force at high-speed rotation and reducing vibration and noise with a simple manufacturing method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a permanent magnet rotor having a permanent magnet embedded inside a rotor core.

[0002]

2. Description of the Related Art Conventionally, a permanent magnet embedded rotor has iron on the outer periphery of the rotor core for embedding the permanent magnet in the rotor core. Therefore, there are thin portions at both ends of the permanent magnet, and a magnetic flux short-circuits the thin portions. This caused a reduction in the induced voltage. A structure of a permanent magnet rotor for preventing the reduction of the induced voltage is disclosed in Japanese Patent Application Laid-Open No. 10-164784.

FIG. 8 is a sectional view of a permanent magnet rotor disclosed in Japanese Patent Application Laid-Open No. 10-164784.

[0004] The rotor core is divided into a core 62 on the inner peripheral side of the permanent magnet 61 and a core 63 on the outer peripheral side.
2 has a protruding portion 64 protruding in the radial direction in the gap between the poles,
The cutting portion 65 is provided between the outer core 63 and the protrusion 64.
Is provided. End plates (not shown) are provided at both ends of the rotor core, and are fixed by caulking pins 66a and 66b penetrating in the axial direction. With this configuration, the magnetic flux of the permanent magnet does not short-circuit due to the presence of the cut portion 65, and effectively passes through the stator, so that the reluctance torque can be effectively used without lowering the induced voltage, and the efficiency is high. Had provided a motor.

[0005]

The conventional permanent magnet rotor as described above has a problem in the strength particularly at the time of high-speed rotation, and it is difficult to obtain the roundness and the squareness of the outer peripheral portion of the rotor. Further, when the permanent magnet was cracked or chipped, it could adhere to the rotor surface and clog the gap.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention divides a rotor core on the rotor outer peripheral side and the rotor inner peripheral side with a permanent magnet as a boundary, and when the rotor core is combined, the permanent magnet or At both ends in a section perpendicular to the axis of the punched hole for embedding the permanent magnet, the rotor core was cut to have a gap, and a permanent magnet and a pipe for preventing the scattering of the rotor core were provided on the outer periphery of the rotor core.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a substantially cylindrical rotor core in which a rotor core sheet formed by punching a high magnetic permeability material such as iron or a magnetic steel sheet is laminated, and a shaft is provided inside the rotor core. A permanent magnet rotor comprising a permanent magnet embedded in a direction, wherein the rotor core is divided into an outer peripheral side and an inner peripheral side with the permanent magnet as a boundary, and is perpendicular to an axis of the punched hole for embedding the permanent magnet or the permanent magnet. A permanent magnet rotor characterized in that it has a gap at a portion abutting on both ends in a simple cross section, and further has a rotor core scattering prevention tube on the outer periphery, which withstands high speed rotation, circularity and squareness Thus, a permanent magnet rotor excellent in quality can be provided.

According to a second aspect of the present invention, there is provided a substantially cylindrical rotor core formed by laminating a rotor core sheet formed by punching a high magnetic permeability material such as iron or an electromagnetic steel sheet, and is embedded in the rotor core in an axial direction. Permanent magnet rotor comprising a permanent magnet, wherein the rotor core is divided into an outer peripheral side and an inner peripheral side with the permanent magnet as a boundary, and in a cross section perpendicular to the axis of the perforated hole for embedding the permanent magnet or the permanent magnet. One end of the both ends is connected with a thin wall, the other end has an air gap, and further has a pipe for preventing the outer rotor core from scattering, so that the rotor core can be easily handled during manufacturing. Thus, a permanent magnet rotor with good productivity can be provided.

According to a third aspect of the present invention, there is provided a permanent magnet or a punched hole for embedding a permanent magnet, of which a rotor core is cut at a rotation advance side end and a rotation reverse side of a cross section perpendicular to an axis. 3.The permanent magnet rotor according to claim 2, wherein the ends of the permanent magnet rotors are connected to each other with a thin portion, and since there is no thin portion on the rotation direction forward side where the rotor magnetic flux is concentrated, short-circuit magnetic flux can be more effectively prevented, and productivity is improved. In addition, a highly efficient motor can be provided.

According to a fourth aspect of the present invention, there is provided a permanent magnet rotor in which permanent magnets are embedded in an axial direction inside a substantially cylindrical rotor core formed by laminating rotor core sheets formed by punching out electromagnetic steel sheets. Both ends of the magnet or permanent magnet embedding punched hole in a cross section perpendicular to the axis extend to near the outer periphery of the rotor, and one end of the permanent magnet or permanent magnet embedding punched hole of the rotor core sheet is connected with a thin wall, and the other end is The rotor core is cut and has a gap, and both ends in a section perpendicular to the axis of the permanent magnet or the punched hole for embedding the permanent magnet are thin and a gap (cut section), respectively.
Is a permanent magnet rotor alternately laminated for each or a plurality of sheets. The rotor core is easy to handle at the time of manufacturing, the productivity is high, and the magnetic saturation of the thin portion can be generated by a small magnetic flux. Therefore, a decrease in induced voltage due to short-circuit magnetic flux can be minimized.

According to a fifth aspect of the present invention, there is provided the permanent magnet rotor according to any one of the first to fourth aspects, wherein the rotor core scattering prevention tube is made of non-magnetic stainless steel, and is made of a sufficiently thin material. However, sufficient strength to withstand high-speed rotation can be maintained.

According to a sixth aspect of the present invention, the rotor core is formed by laminating a rotor core sheet formed by punching out an electromagnetic steel sheet, and the thickness of the rotor core scattering prevention tube is less than the thickness of one rotor core sheet. The permanent magnet rotor according to any one of claims 1 to 4, wherein a magnetic air gap can be reduced, and a permanent magnet motor having a high induced voltage can be provided.

The invention according to claim 7 of the present invention is the permanent magnet rotor according to claim 5, wherein the rotor core scattering prevention tube and one end plate are integrally formed by drawing. By reducing the number of sheets by one, the cost and process can be reduced, and sufficient strength can be obtained even with a thin material.

According to an eighth aspect of the present invention, there is provided a permanent magnet rotor in which a rotor core is press-fitted or shrink-fitted in a rotor core scattering prevention tube, wherein the rotor core is provided with a stress relaxation hole. Item 7. The permanent magnet rotor according to item 7, wherein variations in the rotor core and the permanent magnet cause
Even when the stress is large, the stress can be relieved, and the deformation of the core can prevent the permanent magnet from cracking or chipping.

According to a ninth aspect of the present invention, the stress relaxation hole is located near the center of the magnetic pole, near the inner circumference of the rotor of the permanent magnet located at the innermost circumference of the rotor in each pole, and in the radial direction. 9. The permanent magnet rotor according to claim 8, wherein the shape of the permanent magnet rotor is small and elongated in a direction perpendicular to the radial direction, and the magnetic flux is not hindered by the stress relaxation holes, so that a decrease in efficiency can be prevented.

According to a tenth aspect of the present invention, the rotor core is formed by laminating rotor core sheets formed by stamping out electromagnetic steel sheets, and at least one rotor core sheet at one end or both ends in the stacking direction is a permanent one. 3. The permanent magnet rotor according to claim 1, wherein both ends of the punched hole for embedding the magnet or the permanent magnet in the cross section perpendicular to the axis use a thin and continuous core sheet. Productivity can be improved. further,
It is preferable that the rotor core sheets are fixed to each other by Kalamase, as in the eleventh aspect.

According to a twelfth aspect of the present invention, the permanent magnet is a flat plate, and one permanent magnet is buried per pole in a direction perpendicular to the radial direction. 2. The permanent magnet rotor according to claim 1, wherein the cross section perpendicular to the axis has a substantially square shape or a shape in which a chamfer or a fillet is provided at a corner of the substantially square shape. Yes, material costs can be reduced.

According to a thirteenth aspect of the present invention, the permanent magnet has an arc shape, and two or more permanent magnets are provided for each pole.
5. The permanent magnet rotor according to claim 1, wherein the magnetic path is formed between the permanent magnets in the same magnetic pole so as to be embedded in the radial direction, and the induced voltage is effectively used while effectively using the reluctance torque. Can be increased, and the magnet torque can also be used effectively, thus improving the efficiency.

According to a fourteenth aspect of the present invention, at the time of assembly, the permanent magnet is temporarily magnetized, and the rotor is inserted into the rotor core scattering prevention tube in a state where the rotor core and the permanent magnet are brought into close contact with each other. Item 13 is the method for manufacturing a permanent magnet rotor according to Item 13, wherein the rotor core and the permanent magnet can be handled as one, thereby improving productivity.

According to a fifteenth aspect of the present invention, when the permanent magnet is smaller than the permanent magnet burying hole, a positioning projection is provided on the surface of the rotor core in contact with the permanent magnet, and the permanent projection is provided by the positioning projection. 14. The method for manufacturing a permanent magnet rotor according to claim 1, wherein the assembling is performed with high accuracy in assembly and improved productivity.

[0021]

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

Embodiment 1 FIG. 1 is an exploded perspective view of a permanent magnet rotor according to a first embodiment of the present invention. FIG.
1 shows a sectional view of a permanent magnet rotor according to a first embodiment of the present invention.

The rotor core is divided into a core 12 on the inner peripheral side of the permanent magnet 11 and a core 13 on the outer peripheral side, and a tube 14 for preventing scattering of the rotor core is press-fitted or shrink-fitted around the outer periphery of the rotor core. At both ends in the axial direction of the rotor core, an end plate 14t formed by drawing together with a pipe 14 for preventing scattering of the rotor core and a single end plate 15 are provided, and are fixed by caulking pins 16. The permanent magnet 11 is a plate-shaped rare earth magnet, and a core 12 on the inner peripheral side is provided with a projection 12a for positioning the permanent magnet. The core shape is substantially square, and the corner 12b is chamfered.

The rotor having such a configuration is rotated around a shaft (not shown) inserted into the shaft hole 17 by a rotating magnetic field generated in the stator.

Since there is a gap 18 between the outer core 13 and the inner core 12 on the outer periphery of the rotor core, there is no short circuit of the rotor magnetic flux and even if the rotor core is divided,
Since the rotor core scattering prevention tube 14 is provided at the outer periphery of the rotor, it can withstand the centrifugal force at the time of high-speed rotation.
With a simple manufacturing method, the cylindricity and the squareness of the rotor are improved, so that vibration and noise can be reduced.

If the rotor core scattering prevention tube is made of non-magnetic stainless steel, it can be thin and secure its strength, and its magnetic permeability is low, so that short-circuit of the rotor magnetic flux does not occur. Further, as the thickness of the tube is smaller, the loss due to the generated eddy current can be reduced, and the efficiency is improved. When a rotor core sheet is formed by laminating rotor core sheets formed by punching out electromagnetic steel sheets, it is preferable to use a pipe having a thickness smaller than the thickness of the rotor core sheet, but a sufficient thickness is required to maintain strength. The rotor core scatter prevention tube may be made of stainless steel tube and welded, but if it is formed integrally with one end plate by drawing, the strength of the tube will be improved, so use a thinner material. Can be. Further, since the number of materials is reduced, cost can be reduced, and productivity can be improved by reducing the number of steps.

Since a rare earth magnet is used, a sufficient magnet torque can be obtained, so that the reluctance torque can be supplementary. Therefore, it is not always necessary to provide the protrusion at the portion between the poles of the inner core. If there is no protrusion, the core sheet becomes substantially square, so that the material of the core sheet can be easily removed and the material cost can be reduced.

The fixing of the rotor core sheets can be freely selected according to the intended use, such as caramaze, laser welding, and adhesion. Also, a rivet pin or a bolt may be used as the caulking pin, but the end plate and the rotor core may be fixed by bending the upper end of the pipe for preventing the rotor core from scattering.

Depending on the required torque, the permanent magnet may be ferrite or the like, and the shape of the permanent magnet can be freely selected. In addition, the tip of the permanent magnet burying hole extends in the circumferential direction. This is for concentrating the magnetic flux in a range of an electrical angle of 120 °. It may be small.

Since there is a positioning projection 12a at the portion of the inner core 12 where the permanent magnet is in close contact, the permanent magnet is preferably provided with the projection 12a as a mark. The positioning protrusion may be provided on the core on the outer peripheral side. At this time, if the permanent magnet is temporarily magnetized and inserted into the rotor core scattering prevention tube 14 in a state in which the permanent magnet is in close contact with the rotor core, handling of the rotor core is facilitated and productivity is improved.

(Embodiment 2) FIG. 3 is a sectional view of a permanent magnet rotor according to a second embodiment of the present invention. FIG. 4 is a sectional view showing only the rotor core of FIG.

Regarding the construction and operation, the same parts as in the first embodiment are omitted. Inside the rotor core, per-pole, arc-shaped permanent magnets that are convex in the inner circumferential direction are embedded in two layers in the radial direction. An iron magnetic path (core) is provided between the permanent magnet 21a on the outer peripheral side of the rotor and the permanent magnet 21b on the inner peripheral side of the rotor.
23, a core 24 on the outermost peripheral side of the rotor and a core 22 on the innermost peripheral side of the rotor are connected to the thin portions 26a and 26b, respectively. The permanent magnet burying hole extends to the vicinity of the outer periphery of the rotor, one of which is a gap 27a, 27b, and the other is a thin portion 26a, 26b. The rotor core is formed by laminating rotor core sheets formed by stamping out electromagnetic steel sheets, and the rotor core sheets are separated from each other by Kalamase 28a, 28b, 28
It is fixed by c. The rotor core having the permanent magnet embedded therein is inserted into a permanent rotor core scattering prevention tube 25, and is fixed by an end plate (not shown) and a caulking pin (not shown: inserted into a caulking pin hole 29).

The presence of the magnetic path (core) 23 between the two layers of permanent magnets 21a and 21b increases the q-axis inductance and increases the reluctance torque due to saliency.

Further, since the reluctance torque is large, a large torque and a high efficiency can be realized even when an inexpensive ferrite magnet is used.

Further, in order to prevent the magnetic flux of the permanent magnet from being short-circuited, one of the holes for burying the permanent magnet is provided with gaps 27a and 27b.

When assembling the rotor core, the innermost core 2
2. In order to prevent the cores 23 between the permanent magnets and the core 24 on the outermost periphery from being separated, one of the two ends of the permanent magnet burying hole is connected by thin portions 26a and 26b.

In this case, the magnetic flux concentrates on the forward side in the rotation direction R of the rotor in the outermost peripheral portion and the core between the permanent magnets.
a, 27b may be provided.

Although the thin portions 26a and 26b alone do not have sufficient strength against the high-speed rotation of the rotor, the rotor is difficult to assemble when the rotor is assembled.
Until the rotor core is inserted into the pipe 25 for preventing scattering of the rotor core, it is only necessary to hold the rotor core. Kalamase has an innermost core 22, a core 23 between permanent magnets,
It is preferable to provide each of the outermost cores 24.

(Embodiment 3) FIG. 5 is a sectional view of a permanent magnet rotor according to a third embodiment of the present invention.

Regarding the configuration, the parts denoted by the same reference numerals as those in the second embodiment are the same and will not be described.

Near the center of the magnetic pole of the innermost rotor core 22, a stress relaxation hole 31 is provided which is short in the radial direction and long in the direction perpendicular to the radial direction. In this configuration, the permanent magnet and the rotor core can be brought into close contact with each other,
Although the induced voltage can be increased because the air gap can be reduced, excessive stress may be applied to the permanent magnet due to dimensional variations in the permanent magnet and the rotor core. At this time, the stress applied to the permanent magnet is reduced by the stress relaxation hole 31, and cracking, chipping, and deformation of the rotor core of the permanent magnet can be prevented. Further, in the vicinity of the center of the magnetic pole of the innermost rotor core, the magnetic flux separates on both sides and does not hinder the magnetic flux, so that the deterioration of the characteristics can be suppressed to the minimum. In addition, the position, shape, number, etc. of the stress relaxation holes are not limited to this shape.

(Embodiment 4) FIG. 6 is an exploded perspective view of a permanent magnet rotor showing a fourth embodiment of the present invention.

The same configuration as that of the permanent magnet rotor in the second embodiment is omitted. The components denoted by the same reference numerals are the same.

One of the two ends of the permanent magnet burying holes 41a, 41b of the rotor core sheet 43a has a gap 44a, 4b.
4b, one of which is a thin portion 45a, 45b. When the rotor core sheet 43b coming next to the rotor core sheet 43a is laminated, the thin portions 45c and 45d are provided below the gaps 44a and 44b, respectively.
Air gaps 44c and 44d come below a and 45b. Further, the rotor core sheets are connected to each other by the Karamases 46a and 46a.
b, 46c. Therefore, both ends of the permanent magnet burial hole are
Since about half each has a thin portion, the strength of the rotor core is improved, and the productivity is also improved. In addition, the thickness of the thin portion is effectively half of the thickness of the other rotor core, that is, the magnetic flux of half the thickness when the thickness of the thin portion and the other rotor core are the same, and the thickness of the thin portion is reduced. Is magnetically saturated, so that the short-circuit magnetic flux is reduced by half. Therefore, the reduction of the induced voltage can be reduced by half.

(Embodiment 5) FIG. 7 is an exploded perspective view of a permanent magnet rotor showing a fifth embodiment of the present invention.

The same configuration as that of the permanent magnet rotor in the fourth embodiment is omitted. The components denoted by the same reference numerals are the same.

The rotor core is mainly composed of a rotor core sheet 53b in which both ends of the permanent magnet burying holes 51a, 51b are voids 54a, 54b, and at least one rotor core sheet 53a at one end or both ends in the stacking direction.
The two ends of the holes 51a and 51b for embedding permanent magnets are thin portions 5.
5a and 55b, and the respective rotor core sheets are fixed by Karamases 56a, 56b and 56c. Therefore, if only the rotor core sheets 53b in which both ends of the permanent magnet embedding holes 51a and 51b are voids 54a and 54b are laminated, the innermost rotor core and the four rotor cores between the two layers of permanent magnets 21a and 21b are not formed. A total of nine cores, ie, four outermost rotor cores, are separated, but at least one, preferably one at each end in the stacking direction, at both ends of the permanent magnet burying holes 51a, 51b. By providing a rotor core sheet having thin portions 55a and 55b, and fixing the rotor core sheet to other rotor cores with a karamase, the rotor core can be integrally treated and productivity is improved.
Further, since the number of rotor core sheets having a thin portion is small, most short-circuit magnetic flux can be prevented. In addition, the length of the permanent magnet is made smaller than the thickness of the rotor core, the permanent magnet is prevented from entering the portion of the rotor core sheet having the thin portion, and the thickness of the rotor is made larger than the thickness of the stator. The short circuit of magnetic flux can be further reduced by preventing the stator from opposing the portion of the rotor core sheet having the above.

In each of the above embodiments, the permanent magnet rotor has four poles and uses permanent magnets having the number of poles or twice the number of poles. However, the number of poles is not limited to four. Also, the number of permanent magnets is the number of pole pairs, and a so-called image pole type in which the opposite magnetic pole side of the permanent magnet is used as another pole may be used. Also, two V-shaped permanent magnet burying holes are provided. A flat permanent magnet may be embedded. That is, the shape and number of the permanent magnets, the state of burying, and the like are not limited to those in the above-described embodiment. Further, in all of the above embodiments, the rotor core sheets formed by stamping out electromagnetic steel sheets are laminated, but the rotor core may be a dust core.

That is, various modifications are possible in accordance with the gist of the present invention, and these are not excluded from the scope of the present invention.

[0050]

As described above, according to the first aspect of the present invention, it is possible to provide a permanent magnet rotor that can withstand high-speed rotation and is excellent in roundness and squareness. Further, since the permanent magnet is sealed, the powder of the permanent magnet does not come out of the rotor and clog the air gap.

According to the second aspect of the present invention, it is possible to provide a permanent magnet rotor that can easily handle the rotor core at the time of manufacturing and has high productivity.

According to the third aspect of the present invention, since there is no thin portion on the forward side in the rotation direction where the rotor magnetic flux concentrates, short-circuit magnetic flux can be more effectively prevented, and the productivity is high and the efficiency is high. A motor can be provided.

According to the fourth aspect of the present invention, the handling of the rotor core at the time of manufacture is easy, the productivity is high, and the magnetic saturation of the thin portion can be generated with a small magnetic flux. The reduction of the induced voltage can be minimized.

According to the fifth aspect of the invention, even if the material is sufficiently thin, it is possible to maintain sufficient strength to withstand high-speed rotation, to reduce the magnetic air gap, and to increase the induced voltage. Can be.

According to the seventh aspect of the present invention, the end plate has one
The cost and process can be reduced by reducing the number of sheets, and sufficient strength can be obtained even with a thin material.

According to the eighth aspect of the present invention, even when the stress is large, the stress can be relieved due to the variation of the rotor core and the permanent magnet, and the deformation of the core reduces the cracking and chipping of the permanent magnet. Can be prevented.

According to the ninth aspect of the present invention, the stress relaxation holes are not hindered by the magnetic flux by the stress relaxation holes, so that a decrease in efficiency can be prevented.

According to the tenth aspect, productivity can be improved because the rotor core can be handled integrally. Further, the short circuit of the rotor magnetic flux can be minimized.

According to the twelfth aspect of the present invention, the material removal of the inner rotor core is good, and the material cost can be reduced.

According to the thirteenth aspect, since the induced voltage can be increased while effectively utilizing the reluctance torque, the magnet torque can also be effectively utilized, thereby improving the efficiency.

According to the fourteenth aspect of the present invention, the rotor core and the permanent magnet can be handled as a single unit, thereby improving productivity.

According to the fifteenth aspect of the present invention, it is possible to obtain an effect that the assembling accuracy is good and the productivity is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a permanent magnet rotor according to one embodiment of the present invention.

FIG. 2 is a sectional view of a permanent magnet rotor according to one embodiment of the present invention.

FIG. 3 is a sectional view of a permanent magnet rotor according to a second embodiment of the present invention.

FIG. 4 is a rotor core sheet diagram of a permanent magnet rotor according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a permanent magnet rotor according to a third embodiment of the present invention.

FIG. 6 is an exploded perspective view of a permanent magnet rotor according to a fourth embodiment of the present invention.

FIG. 7 is an exploded perspective view of a permanent magnet rotor according to a fifth embodiment of the present invention.

FIG. 8 is a sectional view of a conventional permanent magnet rotor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Permanent magnet 12 Inner peripheral rotor core 13 Outer peripheral rotor core 14 Tube for rotor core scattering prevention 15, 42 End plate 16 Caulking pin 17, 30 Shaft hole 18, 27a, 27b, 44a, 44b, 44c, 45
d, 54a, 54b air gaps 21a, 21b, 41a, 41b permanent magnet burying holes 22 innermost rotor core 23 rotor core between permanent magnets 24 outermost rotor core 25 pipes for rotor core scattering prevention 26a, 26b, 45a, 45b , 45c, 45d, 5
5a, 55b Thin portion 28a, 28b, 28c, 46a, 46b, 46c, 5
6a, 56b, 56c Caramases 29, 47, 57 Holes for caulking pins 31 Stress relaxation holes 43a, 43b, 53a, 53b Rotor core sheets 51a, 51b Holes for permanent magnets

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Eiji Hinokiwaki 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Terms (reference) 5H622 AA03 CA02 CA05 CA13 CB03 CB04 CB05 PP03 PP10 PP16 PP18 PP19

Claims (15)

[Claims] 1. A permanent magnet rotor comprising a substantially cylindrical rotor core laminated with a rotor core sheet formed by stamping a high magnetic permeability material such as iron or an electromagnetic steel sheet, and a permanent magnet embedded in the rotor core in an axial direction. The rotor core is divided into an outer peripheral side and an inner peripheral side with the permanent magnet as a boundary, and has a gap at a portion abutting on both ends in a cross section perpendicular to the axis of the perforated hole for embedding the permanent magnet or the permanent magnet, A permanent magnet rotor further comprising a rotor core scattering prevention tube on the outer periphery. 2. A permanent magnet rotor comprising: a substantially cylindrical rotor core laminated with a rotor core sheet formed by punching a high magnetic permeability material such as iron or an electromagnetic steel sheet; and a permanent magnet embedded in the rotor core in an axial direction. The rotor core is divided into an outer peripheral side and an inner peripheral side with the permanent magnet as a boundary, and one end of both ends in a section perpendicular to the axis of the perforated hole for embedding the permanent magnet or the permanent magnet is connected with a thin wall. A permanent magnet rotor having an air gap at the other end and a tube for preventing the rotor core from scattering around the outer periphery. 3. The rotor core has an air gap at the end on the rotation advance side, and the end on the rotation reverse side is connected with a thin wall, of the two ends in a section perpendicular to the axis of the permanent magnet or the punched hole for embedding the permanent magnet. The permanent magnet rotor according to claim 2, wherein: 4. Both ends of a permanent magnet or a punched hole for embedding a permanent magnet in a cross section perpendicular to the axis are thin and void portions (cut portions), which are alternately laminated one by one or a plurality of times. 3. The permanent magnet rotor according to claim 2, wherein: 5. The permanent magnet rotor according to claim 1, wherein the rotor core scattering prevention tube is made of non-magnetic stainless steel. 6. The rotor core according to claim 1, wherein a rotor core sheet formed by stamping out an electromagnetic steel sheet is laminated, and the thickness of the rotor core scattering prevention tube is smaller than the thickness of one rotor core sheet. The permanent magnet rotor according to any one of the above. 7. The permanent magnet rotor according to claim 5, wherein the rotor core scattering prevention pipe is formed into a bottomed cylindrical shape by drawing. 8. The permanent magnet rotor according to claim 1, wherein the rotor core is press-fitted or shrink-fitted into a rotor core scattering prevention tube, wherein the rotor core is provided with a stress relaxation hole. Magnet rotor. 9. A stress relaxation hole is located near the center of the magnetic pole near the inner periphery of the rotor of the permanent magnet located on the innermost periphery of the rotor in each pole, is small in the radial direction, and is long in the direction perpendicular to the radial direction. 9. The permanent magnet rotor according to claim 8, wherein the permanent magnet rotor has an elongated hole shape. 10. The rotor core is formed by laminating rotor core sheets obtained by stamping out electromagnetic steel sheets, and at least one rotor core sheet at one end or both ends in the stacking direction has a permanent magnet or a punched hole for embedding a permanent magnet. 3. The permanent magnet rotor according to claim 1, wherein the core sheet uses thin and continuous core sheets at both ends in a cross section perpendicular to the axis. 11. The permanent magnet rotor according to claim 10, wherein the rotor core sheets are fixed to each other by karamase. 12. The permanent magnet is in the form of a flat plate, and one pole per pole.
A plurality of permanent magnets are embedded in a direction perpendicular to the radial direction, and the rotor core on the inner peripheral side of the permanent magnet has a substantially square cross section or a shape in which a chamfer or a fillet is provided at a corner of the substantially square. The permanent magnet rotor according to claim 1, wherein: 13. A permanent magnet having an arc shape, wherein two permanent magnets are provided.
5. The permanent magnet rotor according to claim 1, wherein two or more permanent magnets are buried in a radial direction so that a magnetic path is formed between the permanent magnets in the same magnetic pole. 14. The permanent magnet according to claim 1, wherein a permanent magnet is temporarily magnetized at the time of assembly, and inserted into a rotor core scattering prevention tube in a state where the rotor core and the permanent magnet are in close contact with each other. Manufacturing method of magnet rotor. 15. When the permanent magnet is smaller than the permanent magnet burying hole, a positioning projection is provided on a surface of the rotor core in contact with the permanent magnet, and the permanent magnet is positioned and assembled by the positioning projection. A method for manufacturing a permanent magnet rotor according to any one of claims 1 to 13.