JP2019041483A - Rotor core - Google Patents

Abstract

To reduce flux leakage of a magnet embedded rotor core.SOLUTION: In a rotor core, a plurality of magnetic plates are laminated in a direction of a rotation axis and a plurality of magnet insertion holes are provided in a circumferential direction. Each magnetic plate has an inner magnetic portion positioned inside the magnet insertion hole in the radial direction, and a plurality of outer magnetic portions positioned outside the magnet insertion hole in the radial direction. A connection portion connecting the inner magnetic portion and the outer magnetic portion is provided at least one position in the circumferential direction of each magnetic plate, and a separation portion not connecting the inner magnetic portion and the outer magnetic portion is provided at least one position in the circumferential direction. When each magnet insertion hole of the rotor core is observed from the direction of the rotation axis, both of the connecting portion and the separation portion appear in the direction of the rotation axis at least one time.SELECTED DRAWING: Figure 1

Description

  This specification discloses the technique regarding the rotor core of a rotary electric machine.

  Patent Document 1 discloses a rotor core of a rotating electrical machine. The rotor core of Patent Document 1 is an interior magnet type (IPM: Interior Permanent Magnet), and is provided with a plurality of magnet insertion holes in the circumferential direction. In patent document 1, in order to relieve | force the force added to a rotor core, the slit is provided in the rotor core. Patent document 1 devises the position which provides a slit so that the flow of magnetic flux may not be inhibited by a slit.

Japanese Patent Laying-Open No. 2015-149791

  In Patent Document 1, a plurality of magnet insertion holes are provided in the circumferential direction. In other words, the inner magnetic part positioned radially inward from the magnet insertion hole, the outer magnetic part positioned radially outward from the magnet insertion hole, and a plurality of connection parts connecting the inner magnetic part and the outer magnetic part, The magnet insertion hole is defined. In the case of the rotor core of Patent Document 1, magnetic flux is also generated in the connection portion, so that the effective magnetic flux of the magnet is reduced. That is, in Patent Document 1, magnetic flux leakage occurs at the connection portion, and thus the characteristics of the magnet cannot be sufficiently exhibited. The present specification provides a technique for reducing magnetic flux leakage in an embedded magnet type rotor core.

  The first technique disclosed in the present specification may be a rotor core of a rotating electrical machine in which a plurality of magnetic plates are stacked in the rotation axis direction and a plurality of magnet insertion holes are provided in the circumferential direction. Each magnetic plate may include an inner magnetic portion positioned radially inward from the magnet insertion hole and a plurality of outer magnetic portions positioned radially outward from the magnet insertion hole. In addition, a connecting portion for connecting the inner magnetic portion and the outer magnetic portion is provided at at least one location in the circumferential direction, and the outer magnetic portion adjacent to at least one circumferential location is separated and communicated with the magnet insertion hole. A separating part may be provided. In this rotor core, when each magnet insertion hole of the rotor core is observed from the rotation axis direction, both the connection part and the separation part may appear at least once in the rotation axis direction.

  The 2nd technique indicated by this specification is a rotor core of the 1st technique, and the above-mentioned separation part may appear on both sides of the above-mentioned connection part in the direction of a rotation axis.

  The third technique disclosed in the present specification is the rotor core of the first technique or the second technique, and each magnetic plate includes an outer magnetic part connected to the inner magnetic part by a connection part, and an inner magnetic part. An external magnetic part that is not connected may be provided. Moreover, the outer magnetic parts arrange | positioned in the position which overlaps in a rotating shaft direction may be connected. In this case, at least one outer magnetic part of the plurality of outer magnetic parts that are arranged at overlapping positions in the rotation axis direction and constitute each magnet insertion hole is connected to the inner magnetic part by the connecting part. Good.

  A fourth technology disclosed in the present specification is the rotor core of the third technology, and each magnetic plate may be provided with the connecting portion only at one location between adjacent outer magnetic portions.

  The fifth technique disclosed in the present specification is the rotor core of the first technique or the second technique, and in each magnetic plate, all the outer magnetic parts may include the connection part and the separation part.

  The sixth technology disclosed in the present specification is the rotor core of the fifth technology, and in each magnetic plate, adjacent outer magnetic portions are separated by the separation portion on the one side in the circumferential direction, and in the circumferential direction. On the other hand, they may be connected to each other by the connecting portion.

  The seventh technology disclosed in the present specification is the rotor core of the fifth technology, wherein the connection portion includes a first connection portion that connects one end portion in the circumferential direction of the outer magnetic portion, and an outer magnetic portion. You may include the 2nd connection part which connects the center part of the circumferential direction, and the 3rd connection part which connects the other edge part of the circumferential direction of an outer side magnetic part. In this case, in each magnetic plate, the first connection portion and the third connection portion may alternately appear in the circumferential direction, and the second connection portion may appear between the first connection portion and the third connection portion.

  According to the first technique, each magnet insertion hole is at least partially provided with a separation portion in the direction of the rotation axis (the direction in which the magnetic plates are laminated). That is, each magnet insertion hole can be provided with a portion in which magnetic flux leakage is improved at least partially in the direction of the rotation axis. Moreover, each magnet insertion hole is provided with a connection part at least partially in the rotating shaft direction. Since the inner magnetic portion and the outer magnetic portion of the rotor core are not separated, the operation of inserting the magnet into the magnet insertion hole can be facilitated. Each magnetic plate can be formed by simply punching a plate-like magnetic plate into a predetermined shape (making a hole or the like). By simply laminating magnetic plates having a predetermined shape, for example, by changing the phase, a rotor core having a complicated shape in which a connection portion partially appears in the rotation axis direction can be obtained. According to the first technique, the manufacturing process of the rotor core can also be facilitated.

  According to the second technique, since the separating portions appear on both sides of the connecting portion in the rotation axis direction, the connecting portions do not appear continuously. That is, when focusing on one magnetic plate (referred to as a specific magnetic plate), it is laminated in the vertical direction (rotation axis direction) in contact with the specific magnetic plate at the position where the connection portion of the specific magnetic plate is provided. There is a separation part of the magnetic plate (no connection part is provided). The magnetic flux leaking to the connection part of one magnetic plate can be prevented from leaking to the inner magnetic part through the connection part of the magnetic plates adjacent in the rotation axis direction.

  According to the third technique, since each magnetic plate has the outer magnetic part that is not connected to the inner magnetic part, magnetic flux leakage can be further reduced. Moreover, after laminating each magnetic body (after configuring the rotor core), the plurality of outer magnetic portions arranged at overlapping positions in the rotation axis direction are integrated. In addition, since at least one of the plurality of outer magnetic parts (integrated outer magnetic bodies) constituting each magnet insertion hole is connected to the inner magnetic part, the inner magnetic part and the outer side in each magnet insertion hole. The magnetic part is positioned. Therefore, after the rotor core is configured, the inner magnetic portion and the outer magnetic portion are not separated. The operation | work which inserts a magnet into a magnet insertion hole can be made easy. As described above, according to the third technique, the outer magnetic parts are integrated with each other in the rotation axis direction, and at least one of the plurality of outer magnetic parts constituting the integrated outer magnetic part is used as the inner magnetic part. Connected. Therefore, in each magnetic plate unit, there is an outer magnetic part that is not connected to the inner magnetic part, but the outer magnetic part that is not connected to the inner magnetic part is prevented from being displaced with respect to the inner magnetic part. it can.

  According to the fourth technique, it is possible to realize a structure in which the inner magnetic portion and the outer magnetic portion of the rotor core are not separated while further reducing magnetic flux leakage in each magnetic plate.

  According to the fifth technology, since the inner magnetic portion and the outer magnetic portion are not separated in each magnetic plate, the work of laminating the magnetic plates (step of manufacturing the rotor core) can be facilitated.

  According to the sixth technique, the work of laminating the magnetic plates can be facilitated, and the magnetic flux leakage in each magnetic plate can be reduced.

  According to the seventh technique, the portion where the influence of magnetic flux leakage due to the provision of the connection portion is large (the circumferential end portion of the outer magnetic portion) and the portion where the influence of magnetic flux leakage due to the provision of the connection portion is small (the center of the outer magnetic portion) The frequency at which the connecting portion appears in the rotation axis direction can be changed.

The magnetic board used with the rotor core of 1st Example is shown. The lamination | stacking state of the magnetic board in the rotor core of 1st Example is shown. The magnetic board used with the rotor core of 2nd Example is shown. The lamination | stacking state of the magnetic board in the rotor core of 2nd Example is shown. The magnetic board used with the rotor core of 3rd Example is shown. The perspective view of the rotor core of 3rd Example is shown. The lamination | stacking state of the magnetic board in the rotor core of 3rd Example is shown. The lamination | stacking state of the magnetic board in the rotor core of 3rd Example is shown.

(First embodiment)
With reference to FIG.1 and FIG.2, the rotor core 100 used with a rotary electric machine is demonstrated. FIG. 1 shows a view (plan view) of the rotor core 100 observed from the direction of the rotation axis 20. FIG. 1 shows a magnetic plate 10 a among a plurality of magnetic plates 10 constituting the rotor core 100. FIG. 2 shows a part of the side surface of the rotor core 100 (surface orthogonal to the rotation shaft 20). The rotor core 100 is configured by stacking 45 magnetic plates 10. The number of laminated magnetic plates 10 can be adjusted between 45 and 46.

(Magnetic plate)
The magnetic plate 10a will be described with reference to FIG. The magnetic plate 10a is located at the end in the direction of the rotation axis 20, and a plurality of magnetic plates (magnetic plates 10b, 10c,...) Having the same shape as the magnetic plate 10a are stacked below the magnetic plate 10a. . Hereinafter, when the features common to the plurality of magnetic plates are described, they may be simply referred to as the magnetic plate 10. The magnetic plate 10 is provided with 14 magnet insertion holes 4 in the circumferential direction (rotation direction). Two permanent magnets 30 are inserted into each magnet insertion hole 4. The magnetic plate 10 includes an inner magnetic part 8, an outer magnetic part 2, and a connection part 6 that connects the inner magnetic part 8 and the outer magnetic part 2. The inner magnetic portion 8 is located on the radially inner side (rotary shaft 20 side) from the magnet insertion hole 4. A shaft insertion hole 12 is provided in the center of the inner magnetic part 8. An output shaft (not shown) is inserted into the shaft insertion hole 12. The output shaft rotates about the rotation axis 20. Fourteen V-shaped depressions 8 a are formed on the outer peripheral surface of the inner magnetic part 8. The permanent magnet 30 contacts the surface of the recess 8a.

  The outer magnetic part 2 is located on the radially outer side (the side away from the rotating shaft 20) from the magnet insertion hole 4. In the magnetic plate 10, 14 outer magnetic portions 2 are provided in the circumferential direction (rotational direction). Each outer magnetic part 2 includes a protrusion 18 that protrudes in the radial direction. The shape of the protrusion 18 is V-shaped in accordance with the shape of the recess 8a. The permanent magnet 30 contacts the surface of the protrusion 18. In other words, the V-shaped magnet insertion hole 4 is formed by the recess 8 a of the inner magnetic portion 8 and the protruding portion 18 of the outer magnetic portion 2. A convex portion 22 is provided on the surface of each outer magnetic portion 2. In addition, a concave portion (not shown) is provided at a position corresponding to the convex portion 22 on the back surface of each outer magnetic portion 2. By press-fitting the convex portion 22 into the concave portion, the outer magnetic portions 2 arranged at the same position in the direction of the rotation axis 20 are connected, and the magnetic plates 10 are fixed to each other. The concave portion and the convex portion 22 are fixing portions that fix the magnetic plates 10 to each other.

  The outer magnetic part 2 is connected to the inner magnetic part 8 by a connecting part 6. In the magnetic plate 10, seven connection parts 6 are provided in the circumferential direction. The connecting portion 6 connects one of the circumferential end portions of each outer magnetic portion 2 to the inner magnetic portion 8. In other words, the connecting portion 6 is not provided on the other circumferential end of each outer magnetic portion 2. Therefore, a separation portion 14 that separates adjacent outer magnetic portions 2 from each other is provided at one of the circumferential end portions of each outer magnetic portion 2. Each outer magnetic part 2 includes both a connection part 6 and a separation part 14. In the magnetic plate 10, every other connecting portion 6 is provided with respect to the magnet insertion hole 4 (with respect to the recess 8 a of the inner magnetic portion 8). Further, the connecting part 6 connects the two outer magnetic parts 2 to the inner magnetic part 8. Specifically, one connecting portion 6 connects the two outer magnetic portions 2 to each other, and the one connecting portion 6 connects the two outer magnetic portions 2 to the inner magnetic portion 8. Therefore, in the magnetic plate 10, the connection parts 6 and the separation parts 14 appear alternately in the circumferential direction. The separation part 14 is a gap provided between the two outer magnetic parts 2 and communicates with the magnet insertion hole 4. For this reason, the separation part 14 has a relative permeability substantially equal to “1” and can be said to be a non-magnetic part. In addition, the connection part 6 of the magnetic plate 10b exists below the separation part 14 of the magnetic plate 10a. In FIG. 1, the magnetic plate 10b is indicated by a broken line.

(Rotor core)
A state in which a plurality of magnetic plates 10 are laminated will be described with reference to FIG. FIG. 2 is a part of a side surface of the rotor core 100 (surface in a direction orthogonal to the rotation shaft 20), and shows six magnetic plates 10 (magnetic plates 10a to 10f). As described above, the rotor core 100 is actually provided with 45 magnetic plates 10. The shape of the magnetic plates 10b to 10f is the same as that of the magnetic plate 10a. As shown in FIG. 2, the separation part 14 of the magnetic plate 10b exists below the connection part 6 of the magnetic plate 10a, and the connection part 6 of the magnetic plate 10b exists below the separation part 14 of the magnetic plate 10a. . The magnetic plate 10b and the magnetic plate 10c have the same relationship as the magnetic plate 10a and the magnetic plate 10b. In the rotor core 100, the separation portion 14 exists below the connection portion 6 and the connection portion 6 exists below the separation portion 14 in all of the magnetic plates 10 adjacent in the direction of the rotation axis 20 (the lamination direction of the magnetic plates 10). Have a relationship. Therefore, the rotor core 100 has a relationship in which the separating portions 14 exist on both sides of the connecting portion 6 and the connecting portions 6 exist on both sides of the separating portion 14 in the direction of the rotation axis 20. In other words, the rotor core 100 has a relationship in which the connection portions 6 and the separation portions 14 appear alternately in the direction of the rotation axis 20. The rotor core 100 has an angle (360/14) corresponding to one magnet insertion hole 4 with respect to the laminated magnetic plate 10 (for example, the magnetic plate 10b) when the magnetic plate 10 (for example, the magnetic plate 10a) is stacked. It can be manufactured by laminating the layers with a shift.

(Advantages of the rotor core of the first embodiment)
In the rotor core 100, separation portions 14 are provided for all the magnet insertion holes 4 of all the magnetic plates 10. Therefore, all the outer magnetic parts 2 are separated from one outer magnetic part 2 adjacent in the circumferential direction. By separating the adjacent outer magnetic parts 2, it is possible to prevent the magnetic flux flowing from the permanent magnet 30 inserted into the magnet insertion hole 4 from leaking to the inner magnetic part 8 via the separation part 14, thereby preventing magnetic flux leakage. Can be improved. Further, in the direction of the rotating shaft 20, the connecting portions 6 and the separating portions 14 appear alternately in the direction of the rotating shaft 20. The magnetic flux leaking to the connection part 6 can be prevented from leaking to the inner magnetic part 8 through the magnetic plates 10 adjacent to each other in the direction of the rotation axis 20 (the connection part 6 of the magnetic plate 10). That is, since the connecting portions 6 are separated from each other in the direction of the rotating shaft 20, magnetic flux leakage in the direction of the rotating shaft 20 can be improved. The rotor core 100 can improve magnetic flux leakage in both the circumferential direction and the direction of the rotating shaft 20.

  In the rotor core 100, connection portions 6 are provided for all the magnet insertion holes 4 of all the magnetic plates 10. Therefore, in each magnetic plate 10, all the outer magnetic portions 2 are connected to the inner magnetic portion 8, and all the outer magnetic portions 2 are not separated from the inner magnetic portion 8, thereby facilitating the lamination process of the magnetic plates 10. Can do. Moreover, since the relative position of the inner magnetic part 8 and the outer magnetic part 2 is maintained by the connecting part 6 and the size of each magnet insertion hole 4 is maintained, the process of inserting the permanent magnet 30 into the magnet insertion hole 4 is facilitated. can do. Thus, the rotor core 100 can facilitate the manufacturing process (the lamination process of the magnetic plate 10 and the insertion process of the permanent magnet 30).

(Second embodiment)
The rotor core 200 will be described with reference to FIGS. 3 and 4. The rotor core 200 is a modification of the rotor core 100. Regarding the rotor core 200, the features common to the rotor core 100 may be omitted by giving the same reference numerals as the rotor core 100 or the same two lower digits. Note that FIG. 3 shows a magnetic plate 210 a located at an end portion in the direction of the rotation axis 20 among the plurality of magnetic plates 210 constituting the rotor core 200. Also in this embodiment, when a feature common to a plurality of magnetic plates is described, it may be simply referred to as a magnetic plate 210. The rotor core 200 is configured by stacking 14 or more magnetic plates 210.

(Magnetic plate)
The magnetic plate 210 will be described with reference to FIG. The magnetic plate 210 includes 14 magnet insertion holes 4 and 14 outer magnetic portions 2 (2a to 2n). In the magnetic plate 210, the connection portion 6 is provided between the outer magnetic portions 2 a and 2 n, and the connection portion 6 is not provided between the other outer magnetic portions 2. That is, in the magnetic plate 210, the connection portion 6 that connects the outer magnetic portion 2 to the inner magnetic portion 8 is provided only at one place in the circumferential direction. Specifically, the connecting portion 6 is provided only at one location between the adjacent outer magnetic portions 2 (between the outer magnetic portions 2a and 2n). The connection portion 6 connects the circumferential ends of the two outer magnetic portions 2 (outer magnetic portions 2a and 2n) to the inner magnetic portion 8. That is, in the magnetic plate 210, the two outer magnetic portions 2a and 2n are connected to the inner magnetic portion 8, and the twelve outer magnetic portions 2 (2b to 2m) are not connected to the inner magnetic portion 8 ( It is separated from the inner magnetic part 8). The magnetic plate 210 is provided with 13 separation portions 214a to 214m. In the following description, the outer magnetic part 2 (2a, 2n) connected to the inner magnetic part 8 is referred to as a “connected outer magnetic part”, and the outer magnetic part 2 (2b to 2m) not connected to the inner magnetic part 8 is referred to. ) May be referred to as “unconnected outer magnetic part”.

(Rotor core)
As shown in FIG. 4, a plurality of magnetic plates (magnetic plates 210b, 210c,...) Are stacked below the magnetic plate 210a. The magnetic plate 210a and the magnetic plate 210b include a non-connected outer magnetic portion 2b (the outer magnetic portion 2 not connected to the inner magnetic portion 8) of the magnetic plate 210a and a connected outer magnetic portion 2a (the inner magnetic portion 8) of the magnetic plate 210b. The outer magnetic parts 2) connected to each other are stacked so as to be aligned in the direction of the rotation axis 20. The magnetic plate 210a and the magnetic plate 210b are laminated so as to be shifted by an angle (360/14 degrees) corresponding to one magnet insertion hole 4. Similarly to the magnetic plate 210a and the magnetic plate 210b, the magnetic plate 210b and the magnetic plate 210c are also stacked so as to be shifted in the same direction by an angle corresponding to one magnet insertion hole 4. In the rotor core 200, all of the magnetic plates 210 adjacent in the direction of the rotation axis 20 are stacked while being shifted in the same direction by an angle corresponding to one magnet insertion hole 4.

  As described above, the non-connected outer magnetic portion 2b of the magnetic plate 210a and the connected outer magnetic portion 2a of the magnetic plate 210b are aligned in the direction of the rotation axis 20. Further, the outer magnetic parts 2 arranged at the same position in the direction of the rotating shaft 20 (the unconnected outer magnetic part 2b of the magnetic plate 210a and the connected outer magnetic part 2a of the magnetic plate 210b) are connected. Therefore, when the magnetic plate 210a and the magnetic plate 210b are stacked, the non-connected outer magnetic portion 2b of the magnetic plate 210a is connected to the inner magnetic portion 8 via the connecting portion 6 of the magnetic plate 210b. Similarly, the non-connected outer magnetic portions 2c to 2m of the magnetic plate 210a are also connected to the inner magnetic portion 8 via the connecting portions 6 of the magnetic plates 210c to 2m. Similarly, the non-connected outer magnetic portions 2b to 2m of the other magnetic plates 210 (210b, 210c,...) Are also connected to the inner magnetic portion 8 via the connecting portions 6 of the other magnetic plates 210.

  In the rotor core 200, the magnetic plate 210b (the connecting portion 6 of the magnetic plate 210b) is confirmed from the separation portion 214a of the magnetic plate 210a. Similarly, the magnetic plate 210c is confirmed from the separation portion 214b of the magnetic plate 210a, the magnetic plate 210d is confirmed from the separation portion 214c, the magnetic plate 210e is confirmed from the separation portion 214d, and the magnetic plate 210f is confirmed from the separation portion 214e. The magnetic plate 210g is confirmed from the separation unit 214f, the magnetic plate 210h is confirmed from the separation unit 214g, the magnetic plate 210i is confirmed from the separation unit 214h, the magnetic plate 210j is confirmed from the separation unit 214i, and the magnetic plate 210h is magnetic from the separation unit 214j. The plate 210k is confirmed, the magnetic plate 210l is confirmed from the separation portion 214k, the magnetic plate 210m is confirmed from the separation portion 214l, and the magnetic plate 210n is confirmed from the separation portion 214m. FIG. 3 shows only the separation portions 214a to 214m, and the magnetic plates 210b to 210n are not shown.

  As shown in FIG. 4, in the rotor core 200, the separation portions 14 exist on both sides of the connection portion 6 in the direction of the rotation axis 20. More specifically, in the rotor core 200, the connecting portion 6 appears once every 14 times (14 magnetic plates) in the direction of the rotation axis 20.

(Advantages of the rotor core of the second embodiment)
In the rotor core 200, the separation portions 14 are provided in all the magnet insertion holes 4 of all the magnetic plates 210. Moreover, in each magnetic plate 210, the connection part 6 is provided only in one place. Therefore, the two outer magnetic parts 2 are separated from one outer magnetic part 2 adjacent in the circumferential direction, and the other outer magnetic part 2 is separated from both outer magnetic parts 2 adjacent in the circumferential direction. Magnetic flux leakage in the circumferential direction can be greatly improved. Also, in the direction of the rotation axis 20, the frequency of appearance of the connecting portion 6 at the same position is low (once every 14 magnetic plates). Therefore, the magnetic flux leakage in the direction of the rotating shaft 20 can be greatly improved.

(Third embodiment)
The rotor core 300 will be described with reference to FIGS. The rotor core 300 is a modification of the rotor core 100. About the rotor core 300, about the characteristic in common with the rotor core 100, description may be abbreviate | omitted by attaching | subjecting the same reference number as the rotor core 100, or the last two digits. FIG. 5 shows a magnetic plate 310 a located at an end in the direction of the rotation axis 20 among the plurality of magnetic plates 310 constituting the rotor core 300. Also in this embodiment, when a feature common to a plurality of magnetic plates is described, it may be simply referred to as a magnetic plate 310. The rotor core 300 is configured by stacking 29 magnetic plates 310. The number of stacked magnetic plates 310 can be adjusted between 44 and 46.

(Magnetic plate)
The magnetic plate 310 will be described with reference to FIG. In FIG. 5, only the magnetic plate 310a is shown, and the illustration of the magnetic plate disposed below the magnetic plate 310a is omitted. The magnetic plates (magnetic plates 310b, 310c,...) Disposed below the magnetic plate 310a have the same shape as the magnetic plate 310a. The magnetic plate 310 includes twelve magnet insertion holes 304 a to 304 l, twelve outer magnetic portions 302 a to 302 l, and twelve connection portions 6. In the following description, the features common to the magnet insertion holes 304a to 304l may be simply referred to as the magnet insertion hole 304. Further, when the features common to the outer magnetic portions 302a to 302l are described, they may be simply referred to as the outer magnetic portion 302. In the magnetic plate 310, one connection portion 6 is provided for each outer magnetic portion 302.

  In the magnetic plate 310, the separation part 14 is provided at all between the outer magnetic parts 302 adjacent in the circumferential direction. Therefore, in all the outer magnetic parts 302, the adjacent outer magnetic parts 302 are not connected to each other. The separation unit 14 includes two types of separation unit 14a and a separation unit 14b wider than the separation unit 14a. In addition, the connecting portion 6 includes a connecting portion 6R connected to the end of the outer magnetic portion 302 on the right side of the magnet insertion hole 304 when the magnet insertion hole 304 is observed in the radial direction from the rotating shaft 20, and a magnet insertion. 3 of the connection part 6M connected to the top of the protrusion 18 of the outer magnetic part 302 at the center of the hole 304 and the connection part 6L connected to the end of the outer magnetic part 302 on the left side of the magnet insertion hole 304. There are species. The connecting portion 6R is an example of a first connecting portion, the connecting portion 6M is an example of a second connecting portion, and the connecting portion 6L is an example of a third connecting portion.

  In the magnetic plate 310, the connection portions 6R and 6L are alternately provided in the circumferential direction, and the connection portion 6M is provided between the connection portions 6R and 6L. Specifically, the connection portion 6 is provided in the order of the connection portions 6R, 6M, 6L, 6M, 6R, 6M, 6L, 6M, 6R, 6M, 6L, and 6M in the circumferential direction.

(Rotor core)
The rotor core 300 will be described with reference to FIGS. 6 shows a perspective view of the rotor core 300, FIG. 7 shows a part of a side surface of the rotor core 300, and FIG. 8 shows a cross-sectional view taken along line VIII-VIII in FIG. As shown in FIG. 6, in the rotor core 300, the outer magnetic portion 302a of the magnetic plate 310a, the outer magnetic portion 302b of the magnetic plate 310b, and the outer magnetic portion 302c of the magnetic plate 310c are stacked so as to overlap in the direction of the rotation axis 20. ing. In other words, the magnetic plates 310 a to 310 c are stacked so as to be shifted in the same direction in the circumferential direction by an angle (360/12 degrees) corresponding to each magnet insertion hole 4. The magnetic plates 310 provided below the magnetic plate 310c are also stacked so as to be shifted in the same direction in the circumferential direction by an angle corresponding to one magnet insertion hole 4 respectively.

  As shown in FIG. 7, in the direction of the rotating shaft 20, the connecting portion 6R appears once every four times (four magnetic plates). Therefore, the separation part 14 appears on both sides of the connection part 6R in the direction of the rotation axis 20. Similarly, the connecting portion 6L also appears once every four times in the direction of the rotation axis 20. In addition, in the direction of the rotation axis 20, separation portions 14 appear on both sides of the connection portion 6L. Specifically, in the direction of the rotation axis 20. The separation part 14a appears on one side of the connection parts 6R and 6L, and the separation part 14b appears on the other side. Further, as shown in FIG. 8, every other connecting portion 6M appears in the direction of the rotation axis 20. That is, the connecting portion 6M does not appear continuously in the direction of the rotating shaft 20.

(Advantages of the rotor core of the third embodiment)
In the rotor core 300, all the outer magnetic portions 302 are separated from the other outer magnetic portions 302 in each magnetic plate 310. Magnetic flux can be prevented from leaking to the outer magnetic portions 302 adjacent in the circumferential direction. In addition, since a part of the outer magnetic part 302 is connected to the inner magnetic part 8 using the connecting part 6M, a configuration in which the connecting part 6 does not appear at both ends in the circumferential direction of the outer magnetic part 302 can be realized. . As a result, it is possible to reduce the appearance frequency of the connection parts 6 (connection parts 6R and 6L) located at the radial ends in the direction of the rotation shaft 20.

  Further, the connecting portion 6M is not connected to the inner magnetic portion 8 only by the connecting portion 6M, and the connecting portions 6R and 6L are used together to prevent the connecting portion 6M from continuing in the direction of the rotation axis 20. . In the rotor core 300, the connection portions 6R and 6L are alternately provided in the circumferential direction, the connection portions 6M are provided between the connection portions 6R and 6L, and the magnetic plate 310 is provided at an angle corresponding to one magnet insertion hole 304. By shifting and stacking, the frequency of appearance of the connecting portions 6R and 6L in the direction of the rotation axis 20 (every four pieces) is made lower than the frequency of appearance of the connecting portions 6M (every two pieces). Since the magnetic flux density is high in the central portion in the radial direction of the magnet insertion hole 304, magnetic saturation is likely to occur, and magnetic flux leakage is unlikely to occur even if the connection portion 6M appears frequently. In contrast, the magnetic end of the magnet insertion hole 304 has a lower magnetic flux density than the central portion in the radial direction, so that magnetic saturation is unlikely to occur. Therefore, in the rotor core 300, the frequency of appearance of the connecting portions 6R and 6L is reduced at the radial end portion of the magnet insertion hole 304, and magnetic flux leakage is less likely to occur. The rotor core 300 suppresses the magnetic flux leakage as a whole by changing the frequency of appearance of the connection portion according to the position (radial end portion, radial center portion) where the connection portion is provided.

(Other embodiments)
In the above embodiment, the rotor core having the V-shaped porcelain insertion hole has been described. However, the shape of the porcelain insertion hole can be arbitrarily changed. For example, a substantially rectangular magnet insertion hole may be configured by providing a flat surface on the peripheral surface of the inner magnetic portion or a recess having a flat surface on the bottom portion, and providing a flat surface radially inward of the outer magnetic portion. .

  Moreover, you may perform a low magnetic permeability process with respect to a connection part. That is, the relative magnetic permeability of the connecting portion may be made lower than the relative magnetic permeability of other portions (outer magnetic portion, inner magnetic portion). The low magnetic inductivity treatment of the connection part can be realized, for example, by irradiating and heating the connection part with a laser, or by applying a nonmagnetic paint to the connection part. Magnetic flux leakage can be further reduced by applying a low magnetic inductivity treatment to the connecting portion.

  The first and second embodiments include 14 outer magnetic portions (14 magnet insertion portions), and the third embodiment includes 12 outer magnetic portions (12 magnet insertion portions). Yes. In each embodiment, the number of outer magnetic portions (magnet insertion portions) is not limited to the number described above, and can be arbitrarily changed.

  In the first embodiment and the second embodiment, the connecting portion is provided between the adjacent outer magnetic portions, and one connecting portion connects two adjacent outer magnetic portions to the inner magnetic portion. However, for example, as in the connection portions 6R and 6L of the third embodiment, one connection portion may connect one outer magnetic portion to the inner magnetic portion.

  In 1st Example and 3rd Example, the uneven | corrugated | grooved part (fixed part) is provided in the front and back of an outer side magnetic part, and each magnetic board is being fixed. The fixing part of each magnetic plate may be provided in the inner magnetic part, or may be provided in both the inner magnetic part and the outer magnetic part.

  In the second and third embodiments, the magnetic plates adjacent in the rotation axis direction are stacked while being shifted in the circumferential direction by an angle corresponding to one magnet insertion hole. The angle at which the magnetic plate is shifted in the circumferential direction is arbitrary. For example, the magnetic plate may be shifted in the circumferential direction by an angle corresponding to two magnet insertion holes.

  In the second embodiment, the connection portion that connects the outer magnetic portion to the inner magnetic portion is provided at only one place in the circumferential direction. You may provide a connection part in two or more places of the circumferential direction.

  In the third embodiment, the connection portions 6L, 6M, 6R are provided in the order of the connection portions 6R, 6M, 6L, 6M, 6R, 6M, 6L, 6M, 6R, 6M, 6L, 6M in the circumferential direction. However, the order in which the connection portions 6L, 6M, and 6R are provided and the number of the connection portions 6L, 6M, and 6R are arbitrary. It suffices that all the outer magnetic parts are connected to the inner magnetic part, at least one connection part 6M exists, and all of the adjacent outer magnetic parts are separated from each other. For example, all the outer magnetic parts may be connected only by the connection part 6M. In this case, the connection portion is not provided in the portion where the influence of the magnetic flux leakage is large (the circumferential end portion of the outer magnetic portion), and the connection portion is provided only in the portion where the influence of the magnetic flux leakage is small (the center portion of the outer magnetic portion). Therefore, magnetic flux leakage can be suppressed very suitably.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2: Outer magnetic part 4: Magnet insertion hole 6: Connection part 8: Inner magnetic part 10: Magnetic plate 14: Separating part 20: Rotating shaft 100: Rotor core

Claims (7)

A rotor core of a rotating electrical machine in which a plurality of magnetic plates are laminated in the rotation axis direction and a plurality of magnet insertion holes are provided in the circumferential direction,
Each magnetic plate includes an inner magnetic part positioned radially inward from the magnet insertion hole and a plurality of outer magnetic parts positioned radially outward from the magnet insertion hole, and the inner magnetic part is located at least in one circumferential direction. And a connecting portion for connecting the outer magnetic portion, a separating portion is provided that separates the adjacent outer magnetic portion in at least one circumferential direction and communicates with the magnet insertion hole,
The rotor core, wherein both the connection portion and the separation portion appear at least once in the rotation axis direction when each magnet insertion hole of the rotor core is observed from the rotation axis direction. The rotor core according to claim 1,
The rotor core in which the separation part appears on both sides of the connection part in the rotation axis direction. The rotor core according to claim 1 or 2,
Each magnetic plate includes an outer magnetic part connected to the inner magnetic part by the connection part, and an outer magnetic part not connected to the inner magnetic part,
The outer magnetic parts arranged at overlapping positions in the rotation axis direction are connected,
A rotor core in which at least one outer magnetic part among a plurality of outer magnetic parts constituting each magnet insertion hole is arranged at an overlapping position in the rotation axis direction and is connected to the inner magnetic part by the connection part . The rotor core according to claim 3,
In each magnetic plate, the rotor core is provided with the connecting portion only at one position between adjacent outer magnetic portions. The rotor core according to claim 1 or 2,
In each magnetic plate, a rotor core in which all outer magnetic portions include the connection portion and the separation portion. The rotor core according to claim 5,
In each magnetic plate, adjacent outer magnetic parts are separated by the separation part on one side in the circumferential direction, and are connected to each other by the connection part on the other side in the circumferential direction. The rotor core according to claim 5,
The connecting portion includes a first connecting portion that connects one end portion in the circumferential direction of the outer magnetic portion, a second connecting portion that connects a circumferential central portion of the outer magnetic portion, and a circumferential direction of the outer magnetic portion. Including a third connecting portion for connecting the other end;
In each magnetic plate, the first connecting portion and the third connecting portion appear alternately in the circumferential direction, and the second connecting portion appears between the first connecting portion and the third connecting portion.