JP2007060860A - Permanent magnet type rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent magnet type rotor capable of making a load by a centrifugal force of a permanent magnet piece uniformly work on a rotor iron core. <P>SOLUTION: In this permanent magnet type rotor 1A which is constructed by accommodating the permanent magnet pieces 4 respectively in a plurality of magnet accommodating holes 30 provided adjacent to an outer periphery of the rotor iron core 3 which is formed by laminating a number of steel plates, the rotor iron core 3 is divided into an inner periphery core 10 and the annular outer periphery core 20 which is disposed outside the inner periphery core, the magnet accommodating holes 30 are formed between the inner periphery core 10 and the outer periphery core 20, a flat layer 70 which is formed out of bond magnets previously formed before attachment of the permanent magnet pieces 4 is brought into close contact with an inner wall of the magnet accommodating hole 30 in the outer periphery core 20, and the permanent magnet piece 4 constituted of sintered magnets is accommodated between the flat layer 70 and the inner wall of the magnet accommodating hole 30 facing the flat layer 70. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a permanent magnet type rotor.

  In general, in a permanent magnet rotor in which a plurality of permanent magnet pieces are embedded in a rotor core made of a laminate, a number of unit iron cores are formed by punching a magnetic steel sheet into a predetermined shape and at the same time punching magnet housing holes. The required number of unit iron cores are stacked while aligning the circumferential positions of the receiving holes, and the rotor cores are formed by combining them in the stacking direction, and permanent magnet pieces are inserted into the magnet receiving holes of the rotor core. ing.

  By the way, when the rotor cores are assembled by laminating the unit cores, it is difficult to completely laminate the inner surfaces of the magnet housing holes due to an assembly error or the like, so that a step is generated on the inner surfaces of the magnet housing holes. If a permanent magnet piece is attached to a magnet housing hole with a step on the inner surface in this way, the permanent magnet piece cannot be brought into contact with the radially inner surface of the magnet housing hole of all unit iron cores. Thus, the centrifugal force of the permanent magnet piece acts on a part of the unit cores, and an excessive load is applied to the part of the unit cores. In this case, the load sharing for holding the permanent magnet pieces is biased toward the part of the unit cores, which is disadvantageous in terms of strength. In addition, if the shape and size can withstand the excessive load, the magnetic flux Short circuit becomes large, which is disadvantageous from the viewpoint of motor performance.

In Patent Document 1, a permanent magnet piece is inserted into a magnet housing hole of a rotor iron core, and then magnetic powder (hereinafter referred to as magnet powder) is molded into a gap between the inner surface of the magnet housing hole and the permanent magnet piece. Technology is disclosed.
Patent Document 2 discloses a technique in which a permanent magnet piece is coated on the surface of a permanent magnet piece and then the permanent magnet piece is inserted into a rotor core.
Japanese Patent Laid-Open No. 11-18338 JP 2003-199303 A

However, in the technique disclosed in Patent Document 1, since the magnet powder is put after the permanent magnet piece is inserted, it is difficult to fill the magnet powder with no gap between the inner surface of the magnet accommodation hole and the permanent magnet piece. As a result, the load due to the centrifugal force of the permanent magnet pieces cannot be received on the radially inner surface of the magnet housing holes of all the unit cores, and the problem that an excessive load is applied to some unit cores is solved. It is not possible. Another problem is that eddy currents are generated and heat is generated by inserting magnet powder.
Moreover, in the technique disclosed in Patent Document 2, it is difficult to make the coating layer provided in advance on the surface of the permanent magnet piece in close contact with the inner surface on the radially outer side of the magnet housing holes of all the unit cores. The problem that an excessive load is applied to the unit core cannot be solved.
Therefore, the present invention provides a permanent magnet type rotor that can uniformly apply a load caused by the centrifugal force of the permanent magnet piece to all the steel plates constituting the rotor core.

In order to solve the above-mentioned problems, the invention according to claim 1 is a plurality of magnet insertion openings provided in the vicinity of the outer periphery of a rotor iron core (for example, a rotor iron core 3 in an embodiment to be described later) formed by laminating a plurality of steel plates. Permanent magnet type rotors (for example, in the examples described later) in which permanent magnet pieces (for example, permanent magnet pieces 4 in the examples described later) are respectively accommodated in the parts (for example, magnet accommodating holes 30 in the examples described later). In the permanent magnet rotors 1A and 1B), the rotor core is composed of an inner peripheral core (for example, inner peripheral core 10 in an embodiment described later) and an annular outer peripheral core (for example, in an embodiment described later). And the magnet insertion opening is formed between the inner core and the outer core, and is formed on the inner wall of the magnet insertion opening in the outer core. A smooth layer (for example, a smooth layer 70 in the embodiment described later) made of a bonded magnet formed in advance before mounting the permanent magnet piece is provided in close contact, and the smooth layer and the magnet insertion layer facing the smooth layer are provided. The permanent magnet piece made of a sintered magnet is accommodated between the inner wall of the opening.
By configuring in this way, the outer circumferential surface of the permanent magnet piece in the radial direction can be brought into contact with the radially inner surface of the smooth layer over the entire axial length of the rotor core. A load due to the centrifugal force of the permanent magnet piece can be applied uniformly to all the steel plates constituting the outer core during rotation of the child, and an excessive load can be prevented from being applied to some of the steel plates.
In addition, since the gap between the permanent magnet piece and the outer peripheral core is filled with a smooth layer made of a bonded magnet without a gap, it is possible to suppress a decrease in magnet magnetic flux.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the smooth layer is formed of a resin instead of a bonded magnet.
Even with this configuration, the load due to the centrifugal force of the permanent magnet piece can be applied uniformly to all the steel plates constituting the outer core during rotation of the permanent magnet rotor, and an excessive load is applied to some steel plates. Can be added.

The invention according to claim 3 is a plurality of magnet insertion openings (for example, examples described later) provided near the outer periphery of a rotor core (for example, rotor core 3 in the examples described later) formed by laminating many steel plates. Permanent magnet rotors (for example, permanent magnet rotors 1A and 1B in the embodiments described later), in which permanent magnet segments (for example, permanent magnet segments 4 in the embodiments described later) are respectively stored in the magnet housing holes 30). ), The rotor core is divided into an inner peripheral core and an annular outer peripheral core disposed on the outer peripheral core, and the outer peripheral core is a holding portion (for example, in an embodiment described later) that holds the permanent magnet piece from the outer side. Holding portions 22 and 63) and connecting portions that connect two adjacent holding portions and project radially inward from the holding portions (for example, connecting portions 23 and 64 in the embodiments described later) The magnet insertion opening is formed between the inner peripheral core and the holding portion and the connecting portion of the outer peripheral core, and the permanent wall is formed on the inner wall of the magnet insertion opening in the holding portion. A smooth layer (for example, a smooth layer 70 in an embodiment to be described later) made of a bonded magnet formed in advance before mounting a magnet piece is provided in close contact with the smooth layer and the magnet insertion opening facing the smooth layer. The permanent magnet piece made of a sintered magnet is accommodated between the inner wall and the inner wall.
By configuring in this way, the outer circumferential surface of the permanent magnet piece in the radial direction can be brought into contact with the radially inner surface of the smooth layer over the entire axial length of the rotor core. A load due to the centrifugal force of the permanent magnet piece can be applied uniformly to all the steel plates constituting the outer core during rotation of the child, and an excessive load can be prevented from being applied to some of the steel plates.
Moreover, since the space between the permanent magnet piece and the holding portion is filled with a smooth layer made of a bonded magnet without a gap, a decrease in magnet magnetic flux can be suppressed.

The invention according to claim 4 is the invention according to claim 3, wherein the smooth layer is formed of a resin instead of a bonded magnet.
Even with this configuration, the load due to the centrifugal force of the permanent magnet piece can be applied uniformly to all the steel plates constituting the outer core during rotation of the permanent magnet rotor, and an excessive load is applied to some steel plates. Can be added.

The invention according to claim 5 is the invention according to claim 3 or claim 4, wherein the rotor core is divided into a plurality of divided cores (for example, divided cores in embodiments described later) divided in the circumferential direction at the connecting portion. 40) are connected in a ring shape.
By comprising in this way, the material yield of a rotor iron core can be improved.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the inner peripheral core and the connecting portion are fitted to each other so as to connect the inner peripheral core and the outer peripheral core. The fitting recess 54a) and the fitting protrusion (for example, the fitting protrusion 65a in the embodiment described later) are provided.
By comprising in this way, the circumferential positioning of an inner peripheral core and an outer peripheral core can be performed easily and correctly.

According to a seventh aspect of the present invention, in the invention according to the fifth or sixth aspect of the present invention, the side walls on both sides in the circumferential direction of the divided core are fitted to each other so as to connect the two divided cores adjacent to each other. A mating recess (for example, fitting recesses 56a and 67a in an embodiment described later) and a fitting projection (for example, fitting projections 55a and 66a in an embodiment described later) are provided.
By comprising in this way, the radial positioning of adjacent division | segmentation cores can be performed easily and correctly.
The invention according to an eighth aspect is the invention according to any one of the first to seventh aspects, wherein the inner peripheral core is formed of a single member having a non-laminated structure.
By comprising in this way, the inner wall of the magnet insertion opening part in an inner peripheral core can be made smooth, and the dimensional accuracy and shape precision of this magnet insertion opening part can be raised.

According to the first aspect of the present invention, the load caused by the centrifugal force of the permanent magnet piece can be applied uniformly to all the steel plates constituting the outer core during rotation of the permanent magnet type rotor, and it is excessive for some of the steel plates. Therefore, it is possible to prevent the permanent magnet rotor from being downsized.
Further, since the gap between the permanent magnet piece and the outer peripheral core is filled with a smooth layer made of a bonded magnet without any gap, it is possible to suppress a decrease in the magnetic flux of the magnet, so that the rotor can be reduced in size.
According to the invention which concerns on Claim 2, the load by the centrifugal force of a permanent magnet piece can be made to act uniformly on all the steel plates which comprise an outer periphery core at the time of rotation of a permanent-magnet-type rotor, and it is excessive to some steel plates. Therefore, it is possible to prevent the permanent magnet rotor from being downsized.

According to the third aspect of the present invention, the load caused by the centrifugal force of the permanent magnet piece can be applied uniformly to all the steel plates constituting the outer core during rotation of the permanent magnet type rotor. Therefore, it is possible to prevent the permanent magnet rotor from being downsized.
In addition, since the gap between the permanent magnet piece and the holding portion is filled with a smooth layer made of a bonded magnet without any gap, it is possible to suppress a decrease in the magnetic flux of the magnet, thereby reducing the size of the rotor.
According to the invention which concerns on Claim 4, the load by the centrifugal force of a permanent-magnet piece can be made to act uniformly on all the steel plates which comprise an outer periphery core at the time of rotation of a permanent-magnet-type rotor, and it is excessive to some steel plates. Therefore, it is possible to prevent the permanent magnet rotor from being downsized.

According to the invention which concerns on Claim 5, since the material yield of a rotor iron core can be improved, manufacturing cost can be reduced.
According to the invention which concerns on Claim 6, since the circumferential positioning of an inner peripheral core and an outer peripheral core can be performed easily and correctly, a permanent-magnet-type rotor can be assembled accurately.
According to the invention which concerns on Claim 7, since the radial positioning of adjacent division | segmentation cores can be performed easily and correctly, a permanent-magnet-type rotor can be assembled accurately.
According to the invention of claim 8, the inner wall of the magnet insertion opening in the inner peripheral core can be smoothed, and the dimensional accuracy and shape accuracy of the magnet insertion opening can be increased. When the permanent magnet piece is temporarily fixed to the inner core before attaching the outer core as a procedure for assembling the permanent magnet rotor, the position accuracy of the permanent magnet piece to the inner core is improved, and the permanent magnet rotation The child can be assembled accurately.

Embodiments of a permanent magnet rotor according to the present invention will be described below with reference to the drawings of FIGS.
[Example 1]
First, a permanent magnet rotor according to a first embodiment of the present invention will be described with reference to the drawings of FIGS.
A permanent magnet type rotor (hereinafter abbreviated as “rotor”) 1A includes a rotor shaft 2, a rotor core 3 fixed to the rotor shaft 2, and a permanent magnet piece 4 made of a sintered magnet fixed to the rotor core 3. The main structure.
The rotor core 3 includes an annular inner peripheral core 10 and an annular outer peripheral core 20 fitted on the outer side of the inner peripheral core 10, and both the inner peripheral core 10 and the outer peripheral core 20 are made of silicon steel plates (electromagnetic steel plates). ) Is laminated in large numbers. A circular through hole 11 is provided in the center of the inner core 10, and the rotor shaft 2 is press-fitted and fixed to the through hole 11. The outer peripheral surface of the outer peripheral core 20 is a perfect circle.

A plurality (8 in this embodiment) of magnet accommodation holes (magnet insertion openings) 30 for accommodating the permanent magnet pieces 4 are provided at predetermined intervals in the circumferential direction between the inner core 10 and the outer core 20. It has been.
Specifically, as shown in FIG. 2, the outer peripheral surface of the inner peripheral core 10 is provided with recesses 11 that are recessed radially inward at predetermined intervals, and the inner peripheral surface of the outer peripheral core 20 is recessed radially outward. 21 is provided facing the recess 11 of the inner peripheral core 10, and the recesses 11 and 21 facing each other are connected to form a magnet accommodation hole 30. In the magnet housing hole 30, the inner wall 31 on the radially inner side and the inner walls 32, 33 on both sides in the circumferential direction are formed as linear flat surfaces, and the inner wall 34 on the radially outer side is an arc substantially parallel to the outer circumferential surface of the outer core 20. Formed on the surface.
A portion of the outer peripheral core 20 that is radially outward from the recess 21 is a holding portion 22 that holds the permanent magnet piece 4, and the adjacent holding portions 22 and 22 protrude radially inward from the holding portion 22. They are connected by a connecting part 23. That is, the outer peripheral core 20 is configured by alternately arranging the holding portions 22 and the connecting portions 23 and integrating them.

  The radially inner side wall 24 of the connecting portion 23 of the outer peripheral core 20 is in contact with the radially outer side wall 12 between the recesses 11, 11 in the inner peripheral core 10. A substantially semicircular fitting convex portion 24a and a fitting concave portion 12a are formed on the side walls 24, 12 at substantially the center between two adjacent magnet receiving holes 30, 30, and the fitting convex portion of the outer peripheral core 20 is formed. 24 a is fitted in the fitting recess 12 a of the inner peripheral core 10. As a result, the inner circumferential core 10 and the outer circumferential core 20 are positioned in the circumferential direction, and the concave portions 11 and 21 can be easily and accurately arranged to face each other, and the assembly accuracy of the permanent magnet rotor is improved.

  A smooth layer 70 made of a bonded magnet is formed on the radially outer inner wall of the recess 21 of the outer peripheral core 20, that is, the radially outer inner wall 34 of the magnet housing hole 30, and the smooth layer 70 and the magnet housing hole are formed. The permanent magnet piece 4 is accommodated in the space surrounded by the inner walls 31, 32, 33 of 30 without any gaps. The bonded magnet is a mixture of magnet powder and an organic binder. The smooth layer 70 is formed in advance before the permanent magnet piece 4 is accommodated in the magnet accommodation hole 30, and is in close contact with the inner wall 34 of the magnet accommodation hole 30 in all the laminated silicon steel plates without any gap. The radially inner surface 71 of the layer 70 is formed as a smooth arc surface having the same curvature as the radially outer peripheral surface 4 a of the permanent magnet piece 4. When the permanent magnet piece 4 is housed in the magnet housing hole 30, the outer peripheral surface 4 a of the permanent magnet piece 4 is in close contact with the radially inner surface 71 of the smooth layer 70 and is in surface contact therewith.

The rotor 1A of the first embodiment can be assembled, for example, by the following procedure.
First, a necessary number of materials for the inner core 10 and the outer core 20 are prepared by punching a silicon steel plate, and a predetermined number of these materials are laminated and caulked in the stacking direction, and the circumferential positions of the recesses 11 are matched. The peripheral core 10 and the outer peripheral core 20 in which the circumferential positions of the recesses 21 coincide are formed.
Next, a smooth layer 70 is formed by applying a bond magnet to the inner wall on the radially outer side of the recess 21 of the outer peripheral core 20 (that is, the portion that becomes the inner wall 34 on the radially outer side of the magnet housing hole 30) without drying. . At that time, before the smooth layer 70 is solidified, the surface 71 on the radially inner side of the smooth layer 70 is formed into a smooth arc surface having the same curvature as the outer peripheral surface 4a on the radially outer side of the permanent magnet piece 4 using a jig. Form. The radially inner surface 71 of the smooth layer 70 formed in this way is also flush with the stacking direction of the outer peripheral core 20. Moreover, since the inner peripheral core 10 is not fitted inside the outer peripheral core 20 at the time of forming the smooth layer 70, the smooth layer 70 can be formed very easily.

  Next, the permanent magnet piece 4 is temporarily fixed to the recess 11 of the inner peripheral core 10 with an adhesive or the like. Then, the inner peripheral core 10 to which the permanent magnet pieces 4 are temporarily fixed is press-fitted into the outer peripheral core 20 on which the smooth layer 70 is formed, and the inner peripheral core 10 and the outer peripheral core 20 are integrated to form the rotor core 3. At that time, the fitting convex part 24a of the outer peripheral core 20 is fitted into the fitting concave part 12a of the inner peripheral core 10. Thereafter, the permanent magnet piece 4 is magnetized, and the rotor shaft 1 is press-fitted into the inner peripheral core 10 to complete the rotor 1A. The temporary fixing of the permanent magnet piece 4 to the inner peripheral core 10 is performed by weakly magnetizing the permanent magnet piece 4 in advance and magnetizing the permanent magnet piece 4 in the recess 11 of the inner peripheral core 10 by the magnetic force. Also good.

Thus, by forming the smooth layer 70 on the radially outer inner wall 31 of the magnet housing hole 30, the radially outer peripheral surface 4 a of the permanent magnet piece 4 is smoothed over the entire axial length of the rotor core 3. Surface contact can be made with the radially inner surface 71 of the layer 70.
According to this rotor 1 </ b> A, the radially outer peripheral surface 4 a of the permanent magnet piece 4 is in surface contact with the radially inner surface 71 of the smooth layer 70 over the entire axial length of the rotor core 3. The load caused by the centrifugal force of the permanent magnet piece 4 can be uniformly applied to all the silicon steel plates constituting the outer core 20 when the rotor 1A is rotated, and an excessive load is not applied to some silicon steel plates.
In addition, since the gap between the permanent magnet piece 4 and the holding portion 22 is filled with a smooth layer 70 made of a bonded magnet without any gap, a decrease in magnet magnetic flux can be suppressed, and the rotor 1A can be downsized. Further, since the backlash of the permanent magnet piece 4 in the magnet accommodation hole 30 can be prevented, the permanent magnet piece 4 hits the inner wall of the magnet accommodation hole 30 or the smooth layer 70 when the rotor 1A is rotated. Therefore, the generation of abnormal noise can be prevented, and the quietness of a rotating electrical machine (for example, a motor) provided with the rotor 1A can be improved.

In addition, in this Example 1, the smooth layer 70 was formed with the bond magnet, but you may comprise the smooth layer 70 with resin instead of a bond magnet.
In Example 1, the magnet housing hole 30 was formed by connecting the concave portion 11 provided on the outer peripheral surface of the inner peripheral core 10 and the concave portion 21 provided on the inner peripheral surface of the outer peripheral core 20 to face each other. A convex portion projecting radially outward is provided on the outer peripheral surface of the peripheral core 10, and a tip portion of the convex portion is inserted into the concave portion 21 of the outer peripheral core 20, and a gap between the convex portion and the concave portion 21 is used as a magnet accommodation hole. It is also possible.
Moreover, in Example 1, although the inner peripheral core 10 and the outer peripheral core 20 were both configured by a laminated body of silicon steel plates, the inner peripheral core 10 may be configured by a single member (solid material) that is not a laminated structure, Rather, it is preferable. If the inner peripheral core 10 is formed of a single member having a non-laminated structure, the inner walls 31, 32, 33 of the magnet accommodation hole 30 in the inner circumference core 10 can be formed smoothly, and the dimensional accuracy of the magnet accommodation hole 30 can be increased. Since the shape accuracy can be increased, when the permanent magnet piece 4 is temporarily fixed to the inner core 10 before the outer core 20 is mounted, the accuracy of the position of the permanent magnet piece 4 attached to the inner core 10 is improved. The rotor 1A can be assembled with high accuracy.

[Example 2]
Next, a second embodiment of the permanent magnet rotor according to the present invention will be described with reference to the drawings of FIGS.
As in the first embodiment, the rotor 1B in the second embodiment also has a rotor shaft 2, a rotor core 3 fixed to the rotor shaft 2, and a permanent magnet piece 4 made of a sintered magnet fixed to the rotor core 3. Is the main component.

In the rotor 1B according to the second embodiment, the rotor core 3 is configured by annularly connecting a plurality (eight in this second embodiment) of divided cores 40 divided in the circumferential direction. This point is different from the rotor core 3 of the first embodiment. By configuring the rotor core 3 with the split core 40, the material yield of the rotor core 3 can be improved, and the manufacturing cost of the rotor 1B can be reduced.
More specifically, as shown in FIG. 4, the split core 40 includes an inner peripheral core portion 50 and an outer peripheral core portion 60 fitted on the outer side of the inner peripheral core portion 50. Each of the core parts 60 is configured by laminating a large number of silicon steel plates (electromagnetic steel plates). When the split core 40 is connected in an annular shape, the inner peripheral core portion 50 is connected to form the annular inner peripheral core 10, and the outer peripheral core portion 60 is connected to form the annular outer peripheral core 20. . In other words, the rotor core 3 is composed of an annular inner peripheral core 10 and an annular outer peripheral core 20 fitted to the outside of the inner peripheral core 10.

The inner peripheral surface 51 of the inner peripheral core portion 50 has an arc shape, and when the divided cores 40 are connected in an annular shape, the inner peripheral surfaces 51 are connected to each other and the circular through hole 11 is formed at the center of the inner peripheral core 10. Form. The rotor shaft 2 is press-fitted and fixed in the through hole 11.
Further, the outer peripheral surface 61 of the outer peripheral core portion 60 also has an arc shape, and when the divided cores 40 are connected in an annular shape, the outer peripheral surfaces 61 are connected to form the outer peripheral surface of the true circular outer peripheral core 20.

In the split core 40, a magnet accommodating hole (magnet insertion opening) 30 for accommodating the permanent magnet piece 4 is provided between the inner peripheral core portion 50 and the outer peripheral core portion 60.
More specifically, a convex portion 52 that protrudes radially outward is provided at the center of the outer peripheral surface of the inner peripheral core portion 50, and a concave portion 62 that is recessed radially outward is provided at the center of the inner peripheral surface of the outer peripheral core portion 60. The front part of the convex part 52 is inserted into the concave part 62 of the outer core part 60, and the gap between the convex part 52 and the concave part 62 is formed in the magnet housing hole 30. It has become.

In the magnet housing hole 30, the inner wall 31 on the radially inner side and the inner walls 32, 33 on both sides in the circumferential direction are formed as linear flat surfaces, and the inner wall 34 on the radially outer side is an arc substantially parallel to the outer circumferential surface of the outer core 20. Formed on the surface. In addition, an injection concave groove 53 made of a semicircular arc surface is formed in the center of the radially outer wall surface of the convex portion 52 of the inner core portion 50 constituting the inner wall 31 of the magnet housing hole 30.
The outer circumferential core portion 60 has a holding portion 63 that holds the permanent magnet piece 4 in the radial direction outside the recess 62, and both circumferential sides of the holding portion 63 protrude radially inward from the holding portion 63. It is the connection part 64,64. Therefore, the magnet housing hole 30 is formed between the holding portion 63 and the connecting portions 64 and 64 of the inner peripheral core 10 (the inner peripheral core portion 50) and the outer peripheral core 20 (the outer peripheral core portion 60).

  The radially inner side walls 65, 65 of the connecting portions 64, 64 of the outer peripheral core portion 60 are in contact with the side walls 54, 54 on both sides in the circumferential direction of the inner peripheral core portion 50 rather than the convex portion 52. A substantially semicircular fitting convex portion 65 a and a fitting concave portion 54 a are formed at the center of these side walls 65, 54, and the fitting convex portion 65 a of the outer peripheral core portion 60 is fitted into the fitting concave portion 54 a of the inner peripheral core portion 50. Is fitted. Thereby, the circumferential direction positioning of the inner peripheral core portion 50 and the outer peripheral core portion 60 is performed, and the convex portion 52 of the inner peripheral core portion 50 can be easily inserted into the concave portion 62 of the outer peripheral core portion 60, and the permanent magnet type The assembly accuracy of the rotor is improved.

  A substantially semicircular fitting convex portion 55a protruding outward in the circumferential direction is formed on the side wall 55 on the one circumferential side of the inner circumferential core portion 50, and a fitting convex portion 55a is formed on the side wall 56 on the other circumferential side. The fitting recessed part 56a which can be fitted is formed, and the fitting convex part 55a of the inner peripheral core part 50 is fitted to the fitting concave part 56a of the adjacent inner peripheral core part 50. Thereby, the radial positioning of the inner peripheral core portions 50 is accurately performed, and the inner peripheral surfaces 51 of the inner peripheral core portion 50 are smoothly connected to form the through hole 11 of the inner peripheral core 10 in a circular shape. As a result, the assembly accuracy of the permanent magnet rotor is improved.

A substantially semicircular fitting convex portion 66a projecting outward in the circumferential direction is formed on the side wall 66 on one circumferential side of the outer peripheral core portion 60, and the fitting convex portion 66a is fitted on the side wall 67 on the other circumferential side. A mating concave portion 67 a that can be mated is formed, and the mating convex portion 66 a of the outer peripheral core portion 60 is fitted into the fitting concave portion 67 a of the adjacent outer peripheral core portion 60. Thereby, the radial positioning of the outer peripheral core portions 60 is accurately performed, the outer peripheral surfaces 61 of the outer peripheral core portions 60 are smoothly connected to each other, and the outer peripheral surface of the outer peripheral core 20 can be formed in a circular shape. The assembly accuracy of the magnet rotor is improved.
When the split cores 40 are connected in an annular shape in this way, the connecting portions 64 and 64 of the adjacent outer peripheral core portions 60 and 60 are connected to each other, and the outer peripheral core 20 is connected to the holding portion 63. Are alternately arranged and integrated. In other words, the rotor core 3 is configured by annularly connecting the divided cores 40 divided in the circumferential direction at the connecting portion 64.

  A smooth layer 70 made of a bonded magnet is formed on the radially outer inner wall of the recess 62 of the outer core portion 60, that is, the radially outer inner wall 34 of the magnet housing hole 30. The permanent magnet piece 4 is disposed in close contact with the inner surface 71, and between the permanent magnet piece 4 and the inner wall 31 of the magnet housing hole 30 (that is, the radially outer wall of the convex portion 52 of the inner peripheral core portion 50). In addition, the closing layer 80 made of a bonded magnet is formed without a gap.

The smooth layer 70 is formed in advance before the inner peripheral core portion 50 is fitted inside the outer peripheral core portion 60 and before the permanent magnet piece 4 is accommodated in the concave portion 62 of the outer peripheral core portion 60. All the laminated silicon steel plates constituting the outer peripheral core portion 60 are in close contact with the inner wall on the radially outer side of the recess 62 (that is, the portion constituting the inner wall 34 in the magnet housing hole 30) without any gap, and the radial direction in the smooth layer 70 The inner surface 71 is formed in a smooth circular arc surface having the same curvature as the outer peripheral surface 4 a on the radially outer side of the permanent magnet piece 4. When the permanent magnet piece 4 is housed in the magnet housing hole 30, the outer peripheral surface 4 a of the permanent magnet piece 4 is in close contact with the radially inner surface 71 of the smooth layer 70 and is in surface contact therewith.
On the other hand, the closing layer 80 is formed after the inner peripheral core portion 50 is fitted inside the outer peripheral core portion 60 and after the permanent magnet piece 4 is accommodated in the magnet accommodating hole 30.

The rotor 1B of the second embodiment can be assembled by the following procedure, for example.
First, silicon steel sheets are punched to prepare the required number of materials for the inner peripheral core portion 50 and the outer peripheral core portion 60, and a predetermined number of these materials are stacked and caulked in the stacking direction, and the circumferential positions of the convex portions 52 are matched. An inner peripheral core portion 50 is formed, and an outer peripheral core portion 60 is formed in which the circumferential positions of the concave portions 62 are matched.

  Next, the smooth layer 70 is formed by applying the bond magnet to the inner wall on the radially outer side of the recess 62 of the outer peripheral core portion 60 (that is, the portion that becomes the inner wall 34 on the radially outer side of the magnet housing hole 30) without drying. To do. At that time, before the smooth layer 70 is solidified, the surface 71 on the radially inner side of the smooth layer 70 is formed into a smooth arc surface having the same curvature as the outer peripheral surface 4a on the radially outer side of the permanent magnet piece 4 using a jig. Form. The radially inner surface 71 of the smooth layer 70 formed in this way is also flush with the stacking direction of the outer peripheral core portion 60. Moreover, since the inner periphery core part 50 is not fitted inside the outer periphery core part 60 at the time of forming the smooth layer 70, the smooth layer 70 can be formed easily.

Next, the permanent magnet piece 4 is temporarily fixed to the radially inner surface of the smooth layer 70 formed on the outer peripheral core portion 60 with an adhesive or the like, and the inner surface of the outer peripheral core portion 60 to which the permanent magnet piece 4 is temporarily fixed is fixed. The peripheral core part 50 is fitted. At that time, the fitting convex portion 65 a of the outer peripheral core portion 60 is fitted into the fitting concave portion 54 a of the inner peripheral core portion 50. The temporary fixing of the permanent magnet piece 4 to the smooth layer 70 may be performed by weakly magnetizing the permanent magnet piece 4 in advance and magnetizing the permanent magnet piece 4 to the smooth layer 70 by the magnetic force.
Next, the bonded magnet is injected into the space formed between the permanent magnet piece 4 and the inner peripheral core portion 50 from the injection concave groove 53 provided in the convex portion 52 of the inner peripheral core portion 50 without any gap. It solidifies to form the blocking layer 80 and disables the movement of the permanent magnet piece 4 in the magnet housing hole 30. Thus, the split core 40 is completed.

  Next, the rotor core 3 is assembled by connecting the split cores 40 in an annular shape. At that time, the fitting convex portion 55a of the inner peripheral core portion 50 is fitted into the fitting concave portion 56a of the adjacent inner peripheral core portion 50, and the fitting convex portion 66a of the outer peripheral core portion 60 is fitted to the adjacent outer peripheral core portion 60. Is fitted into the fitting recess 67a. Thereafter, the permanent magnet piece 4 is magnetized, and the rotor shaft 1 is press-fitted into the through hole 11 of the inner peripheral core 10 to complete the rotor 1B. The permanent magnet pieces 4 may be magnetized before the split cores 40 are connected in a ring shape.

As described above, the smooth layer 70 is formed on the radially outer inner wall of the recess 62 of the outer circumferential core portion 60, so that the radially outer circumferential surface 4 a of the permanent magnet piece 4 extends over the entire axial length of the rotor core 3. The surface 71 can be brought into surface contact with the radially inner surface 71 of the smooth layer 70.
According to this rotor 1B, the outer peripheral surface 4a on the radially outer side of the permanent magnet piece 4 is in surface contact with the radially inner surface 71 of the smooth layer 70 over the entire axial length of the rotor core 3. When the rotor 1B rotates, a load due to the centrifugal force of the permanent magnet piece 4 can be applied uniformly to all the silicon steel plates constituting the outer core 20, and an excessive load is not applied to some silicon steel plates.

Further, since the space between the permanent magnet piece 4 and the holding portion 22 is filled with the smooth layer 70 made of a bonded magnet without any gap, a decrease in magnet magnetic flux can be suppressed, and the rotor 1B can be downsized.
Further, since the gap between the permanent magnet piece 4 and the inner peripheral core portion 50 is filled with a closed layer 80 made of a bonded magnet without any gap, the permanent magnet piece 4 is not rattled in the magnet housing hole 30, and the rotor 1B is Since the permanent magnet piece 4 does not hit the inner wall of the magnet housing hole 30, the smooth layer 70, or the blocking layer 80 when rotated, it is possible to prevent the generation of abnormal noise, and the rotating electric machine (with the rotor 1B ( For example, the quietness of a motor or the like can be improved.

In the second embodiment, the smooth layer 70 is formed of a bonded magnet. However, the smooth layer 70 may be formed of a resin instead of the bonded magnet. The same applies to the blocking layer 80, and the blocking layer 80 may be made of resin instead of the bonded magnet.
In the second embodiment, the inner peripheral core portion 50 is provided with the fitting convex portion 55a and the fitting concave portion 56a, and the outer peripheral core portion 60 is provided with the fitting convex portion 66a and the fitting concave portion 67a to be fitted to each other. The split core 40 is connected in an annular shape, but the fitting convex part and the fitting concave part need only be in either the inner peripheral core part 50 or the outer peripheral core part 60, and the other can be omitted. is there. Further, the blocking layer 80 may be omitted, and the radially outer wall surface of the convex portion 52 of the inner peripheral core portion 50 may be brought into close contact with the radially inner wall surface of the permanent magnet piece 4. FIG. 5 is a front view of the split core 40 in an example in which the outer peripheral core portion 60 is not provided with the fitting convex portion 66a and the fitting concave portion 67a, and the blocking layer 80 is not provided.

Furthermore, as shown in FIG. 6, the fitting convex part 65a of the outer peripheral core part 60 and the fitting concave part 54a of the inner peripheral core part 50 can be omitted.
In the second embodiment, the convex portion 52 is provided in the center of the outer peripheral surface of the inner peripheral core portion 50, and the tip portion of the convex portion 52 is inserted into the concave portion 62 of the outer peripheral core portion 60. As shown in FIG. 7, a recess 57 is provided on the outer peripheral surface of the inner peripheral core portion 50, and a recess 62 provided on the inner peripheral surface of the outer peripheral core portion 60 is provided. It is good also as arrange | positioning opposingly and it is good also as the magnet accommodation hole 30 between these.
Moreover, in Example 2, although the inner peripheral core 10 (inner peripheral core part 50) and the outer peripheral core 20 (outer peripheral core part 60) were comprised with the laminated body of the silicon steel plate, the inner peripheral core 10 (inner peripheral core part 50). ) May be composed of a single member (solid material) that is not a laminated structure, but that is preferable.

It is a front view in Example 1 of the permanent magnet type rotor which concerns on this invention. It is the elements on larger scale of the permanent magnet type rotor of the said Example 1. FIG. It is a front view in Example 2 of the permanent magnet type rotor which concerns on this invention. It is a front view of the split core in the permanent magnet type rotor of the said Example 2. FIG. It is a front view of the modification of the division | segmentation core in the said Example 2. FIG. It is a front view of another modification of the split core in Example 2. It is a front view of another modification of the division | segmentation core in the said Example 2. FIG.

Explanation of symbols

1A, 1B Permanent magnet type rotor 3 Rotor core 4 Permanent magnet piece 10 Inner core 20 Outer core 22 Holding section 23 Connecting section 30 Magnet accommodation hole (magnet insertion opening)
40 Split core 54a Fitting recess 55 Side wall 55a Fitting protrusion 56 Side wall 56a Fitting recess 63 Holding portion 64 Connecting portion 65a Fitting protrusion 66 Side wall 66a Fitting protrusion 67 Side wall 67a Fitting recess 70 Smooth layer

Claims (8)

In the permanent magnet type rotor in which permanent magnet pieces are respectively accommodated in a plurality of magnet insertion openings provided in the vicinity of the outer periphery of the rotor core formed by laminating a large number of steel plates,
The rotor iron core is divided into an inner peripheral core and an annular outer peripheral core disposed outside the inner core, and the magnet insertion opening is formed between the inner peripheral core and the outer peripheral core. A smooth layer made of a bonded magnet formed in advance before attaching the permanent magnet piece is closely attached to the inner wall of the magnet insertion opening, and the smooth layer and the magnet insertion opening facing the smooth layer are provided. The permanent magnet rotor, wherein the permanent magnet piece made of a sintered magnet is accommodated between the inner wall and the inner wall.   The permanent magnet rotor according to claim 1, wherein the smooth layer is formed of a resin instead of a bonded magnet. In the permanent magnet type rotor in which permanent magnet pieces are respectively accommodated in a plurality of magnet insertion openings provided in the vicinity of the outer periphery of the rotor core formed by laminating a large number of steel plates,
The rotor core is divided into an inner peripheral core and an annular outer peripheral core disposed on the outer periphery. The outer peripheral core connects the holding portion that holds the permanent magnet piece from the outside and the two adjacent holding portions. And a connecting portion that protrudes radially inward from the holding portion is integrally formed, and the magnet insertion opening is formed between the inner peripheral core and the holding portion and the connecting portion of the outer peripheral core, A smooth layer made of a bonded magnet formed in advance before mounting the permanent magnet piece is closely attached to the inner wall of the magnet insertion opening in the holding portion, and the magnet facing the smooth layer and the smooth layer is provided. The permanent magnet rotor, wherein the permanent magnet piece made of a sintered magnet is accommodated between the inner wall of the opening for insertion.   The permanent magnet rotor according to claim 3, wherein the smooth layer is formed of a resin instead of a bonded magnet.   5. The permanent magnet rotor according to claim 3, wherein the rotor core is formed by annularly connecting a plurality of divided cores divided in the circumferential direction at the connecting portion.   The fitting part and fitting convex part which are mutually fitted in the said inner periphery core and the said connection part, and connect the said inner periphery core and the said outer periphery core are provided. Permanent magnet rotor.   The side wall on both sides in the circumferential direction of the divided core is provided with a fitting concave portion and a fitting convex portion that are connected to each other and connect the two divided cores adjacent to each other. The permanent magnet rotor according to claim 6.   The permanent magnet rotor according to any one of claims 1 to 7, wherein the inner peripheral core is formed of a single member having a non-laminated structure.

Images