JP2010022156A - Core for rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core for a rotor avoiding or suppressing the movement of a magnet and to provide a structure for easy molding by a mold. <P>SOLUTION: A projecting section 30 is formed between a first surface 152 on the rotating-shaft Q side of surfaces defining a first magnet holding section 162 and the first surface 154 on the rotating-shaft Q side of surfaces defining a second magnet holding section 164. The projecting section 30 is approximately perpendicular to the first surface 152 in the surface using the rotating-shaft Q direction as a normal at the end section of the first surface 152 of the first magnet holding section 162. The projecting section 30 is approximately perpendicular to the first surface 154 in the same surface at the end section (the end section on the reverse side of the end section 22) of the first surface 154 of the second magnet holding section 164. Consequently, a collision between the magnet (not shown) held by the first magnet holding section 162 and the magnet (not shown) held by the second magnet holding section 164 is avoided, and damage by the collision between the magnet and the projecting section 30 can be avoided or suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor core (hereinafter also referred to as “rotor core”) employed in a rotor of a motor, and more particularly to a rotor core mounted on a magnet-embedded motor.

  As a motor, an IPM motor (Interior Permanent Magnet Motor) in which a magnet is embedded in a rotor core has been put into practical use. The IPM motor is disclosed in the following Patent Documents 1 to 4.

  10 and 11 are plan views showing a part of conventional rotor cores 91 and 95, and FIG. 10 shows a mode in which one magnet embedding hole 92 has two magnet holding portions 922 and 924. FIG. 11 shows a mode in which one magnet embedding hole 96 has three magnet holding portions 962, 964, 966, respectively.

  If the magnets 942 and 944 are embedded in each of the magnet holding portions 922 and 924, the magnet 942 and the magnet 944 may collide inside the magnet embedding hole 92. Further, when the magnets 982, 984, 986 are embedded in the magnet holding portions 962, 964, 966, the magnet 982 and the magnet 984 or the magnet 982 and the magnet 986 may collide inside the magnet embedding hole 96.

  Such a collision causes problems such as breakage of the corners of the magnets 942, 944, 982, 984, and 986. In order to avoid or suppress the problem, it is important to suppress the movement of the magnets 942, 944, 982, 984, 986.

Japanese Patent No. 3484878 JP 2003-074742 A JP 2006-166543 A JP 2007-159196 A

  12 is a plan view showing a part of a rotor core 95A provided with magnet holding projections 963, 965, 967, and 969 in the embodiment of FIG. As shown in FIG. 12, for example, magnet holding protrusions 963 and 965 suppress the collision between the magnet 982 embedded in the first magnet holding portion 962 and the magnet 984 embedded in the second magnet holding portion 964. Further, the magnet holding protrusions 967 and 969 suppress the collision between the magnet 982 and the magnet 986 embedded in the third magnet holding portion 966.

  However, between the first magnet holding projection 963 and the second magnet holding projection 965, and between the third magnet holding projection 967 and the fourth magnet holding projection 969, there are small concave portions with acute angles, respectively. Since it was formed, the shape was unsuitable for punching and molding with a mold.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a rotor core that avoids or suppresses movement of a magnet and exhibits a structure that can be easily molded with a mold.

  In order to solve the above-mentioned problem, the first invention is a columnar portion (14, 14F) extending in a direction along the rotation axis (Q) of the shaft (12), and the opposite side of the columnar portion to the rotation axis. A plurality of magnet embedding holes (16, 16F) having a plurality of magnet holding portions (162, 164, 166, 164F, 166F) extending in the direction on the rotating shaft side of the side surface (140) of The rotor core (10, 10F), wherein the magnet embedding hole has a pair of end portions (22, 24) disposed on the side surface side, and approaches each other from the end portions. The first and second magnet holding portions and the second magnet holding portions that extend from the end portion toward the rotating shaft side and exhibit the first and second magnet holding portions corresponding to the end portions, respectively. Bend portions (32, 42) between the magnet embedded holes and the bend portions. Toward projection projecting exhibits (30,40,40A, 40B, 40C, 40D, 40E, 40F) and.

  2nd invention is 1st invention, Comprising: The said protrusion (30, 40, 40A, 40B, 40F) is the 1st by the side of the said rotating shaft (Q) among the surfaces which prescribe | regulate the said magnet embedding hole. Projecting from one surface (152, 154, 156, 154F, 156F) toward a second surface (172, 174, 176) facing the first surface.

  3rd invention is 2nd invention, Comprising: The protrusion part (44A; 62A, 66A) of the said protrusion (40A) in the surface which makes the said rotating shaft (Q) direction a normal line is the said protrusion. And parallel to the second surface (172, 176) facing each other.

  4th invention is 2nd invention, Comprising: The protrusion part (44B) of the said protrusion (40B) in the surface which makes the said rotating shaft (Q) direction a normal line opposes the said protrusion. It presents a concave arc centered on the outer periphery side bent portion (42) exhibited by the two surfaces (172, 176).

  5th invention is 1st invention, Comprising: The said protrusion (40C, 40D, 40E) is the 1st surface (152) of the said rotating shaft (Q) side among the surfaces which prescribe | regulate the said magnet embedding hole. , 154, 156) projecting from the second surface (172, 174, 176) facing the first surface.

  6th invention is 5th invention, Comprising: The protrusion part (44D) of the said protrusion (40D) in the surface which makes the said rotating shaft (Q) direction a normal line opposes the said protrusion. It is parallel to one surface (152, 156).

  7th invention is 5th invention, Comprising: The protrusion part (44E) of the said protrusion (40E) in the surface which makes the said rotating shaft (Q) direction a normal line opposes the said protrusion. A convex arc substantially parallel to the inner peripheral bent portion (48) exhibited by one surface (152, 156) is exhibited.

  According to 1st invention, it can avoid that the magnet arrange | positioned by the adjacent magnet holding | maintenance part contacts, and can avoid or suppress breakage | damage of a magnet. Moreover, it is easy to punch out the magnet embedding hole from the columnar part. That is, integral molding is easy.

  According to the second invention, it is easy to ensure the strength of the base of the protrusion.

  According to the third invention, since the width of the gap between the protruding end portion and the second surface can be secured at a certain value or more, the decrease in magnetic resistance can be avoided or suppressed, and the leakage magnetic flux can be reduced.

  According to the fourth invention, it is possible to reduce the leakage magnetic flux and improve the life of the mold for punching out the magnet embedding hole.

  According to the fifth aspect, since the gap near the center of the tip is made narrower than the gap near the other area, it is possible to avoid or suppress the decrease in magnetic resistance and reduce the leakage magnetic flux.

  According to the sixth invention, since the width of the gap between the protruding end portion and the first surface can be secured at a certain value or more, the decrease in magnetic resistance can be avoided or suppressed, and the leakage magnetic flux can be reduced.

  According to the seventh invention, it is possible to reduce the leakage magnetic flux and improve the life of the mold for punching out the magnet embedding hole.

  Preferred embodiments of the present invention will be described below with reference to the drawings. In the following drawings including FIG. 1, only elements related to the present invention are shown.

<Outline of configuration>
FIG. 1 is a perspective view illustrating an outline of a rotor core 10. The rotor core 10 includes a columnar portion 14 that exhibits a magnet embedding hole 16.

  The columnar portion 14 is formed in, for example, a substantially cylindrical shape, and exhibits a substantially circular through-hole 11 in a plan view viewed from the direction along the height direction connecting the center of the upper surface and the center of the lower surface of the cylindrical body. Thus, the shaft 12 is fitted into the through hole 11. Then, the shaft 12 rotates around the rotation axis Q.

  A plurality of magnets extending in the direction of the rotation axis Q are embedded in a region between the side surface 110 defining the through-hole 11 on the rotation axis Q side and the side surface 140 opposite to the side surface 110 of the side surfaces of the columnar portion 14. A hole 16 is present.

  One magnet embedding hole 16 has, for example, a substantially U-shape in a plane having the normal direction in the rotation axis Q direction. Specifically, the magnet embedding holes 16 are adjacent to the through-holes 11 at the ends of the first magnet holding part 162 extending in the tangential direction of the circle defining the through-holes 11 and the first magnet holding part 162. Each has a second magnet holding part 164 and a third magnet holding part 166 extending in a direction away from the rotation axis Q with the bent parts 25 and 27 being provided. An angle formed by the first magnet holding unit 162 and the second magnet holding unit 164 (that is, an angle formed by the bent portion 25), and an angle formed by the first magnet holding unit 162 and the third magnet holding unit 166. (That is, the angle formed by the bent portion 27) is less than 180 degrees (however, an obtuse angle). That is, the line segment L connecting the end portion 22 on the side surface 140 side of the second magnet holding portion 164 and the end portion 24 on the side surface 140 side of the third magnet holding portion 166 is greater than the first magnet holding portion 162. Is also located on the side 140 side.

  In other words, each of the magnet embedding holes 16 has a pair of end portions 22 and 24 arranged on the side surface 140 side, and is closer to each other from both end portions 22 and 24 than both end portions 22 and 24. It extends to the rotation axis Q side. The first magnet holding part 162 in which the magnet embedding hole 16 is closest to the shaft 12 is located between the pair of end parts 22 and 24 in the circumferential direction about the rotation axis Q.

  In other words, one magnet embedding hole 16 has a pair of bent portions 25 and 27 that form an obtuse angle on the side surface 140 side between the positions of the pair of end portions 22 and 24 in the circumferential direction about the rotation axis Q. And the 1st magnet holding part 162 pinched | interposed by a pair of bending parts 25 and 27 becomes flat at substantially right angle with respect to the radial direction about the rotating shaft Q in the position where the 1st magnet holding part 162 is arrange | positioned. .

  The rotor core 10 having such a schematic configuration exhibits the shape shown in each of the following embodiments, whereby the magnet can be avoided or suppressed from being damaged inside the magnet embedding hole 16.

<First Embodiment>
FIG. 2 is a plan view of a part of the rotor core 10 according to the first embodiment of the present invention, and shows a state where the region separated by the AOB in FIG. 1 is looked down along the rotation axis Q direction. FIG. 3 is an enlarged view of a part of the region P in FIG.

  In the first embodiment, the protrusion 30 is provided at a position corresponding to the bent portion 25. Specifically, out of the parts that define the bent part 25, if the side far from the rotation axis Q is the outer peripheral side bent part 32, the position that faces the outer peripheral side bent part 32, that is, the part that defines the bent part 25. At a position on the side close to the rotation axis Q, a protrusion 30 that protrudes toward the outer peripheral bending portion 32 is presented. Similarly, a protrusion 40 is provided at a position corresponding to the bent portion 27. Specifically, out of the parts that define the bent part 27, if the side far from the rotation axis Q is the outer peripheral side bent part 42, the position that faces the outer peripheral side bent part 42, that is, the part that defines the bent part 27 At a position on the side close to the rotation axis Q, a protrusion 40 is provided that protrudes toward the outer peripheral bent portion 42. In short, the protrusions 30 and 40 protrude from the radially inner side of the rotor core 10 toward the radially outer side.

  The protrusion 30 includes a first surface 152 on the rotation axis Q side of the surface defining the first magnet holding portion 162 and a first surface on the rotation axis Q side of the surface defining the second magnet holding portion 164. 154. The protrusion 30 is substantially perpendicular to the first surface 152 in a plane normal to the rotation axis Q direction at the end of the first surface 152 of the first magnet holding portion 162, and the second magnet holding portion At the end of the first surface 154 of 164 (end opposite to the end 22), the first surface 154 is substantially perpendicular to the first surface 154 within the same surface. As a result, a collision between a magnet (not shown) held by the first magnet holding part 162 and a magnet (not shown) held by the second magnet holding part 164 is avoided, and the magnet is further projected 30. It can avoid or suppress that it collides with and is damaged.

  Similarly, the protrusion 40 also includes a first surface 152 on the rotation axis Q side of the surface defining the first magnet holding portion 162 and a first surface 152 on the rotation axis Q side of the surface defining the third magnet holding portion 166. It is formed between the first surface 156. The protrusion 40 is substantially perpendicular to the first surface 152 in a plane normal to the rotation axis Q direction at the end of the first surface 152 of the first magnet holding portion 162, and the third magnet holding portion At the end of the first surface 156 of 166 (the end opposite to the end 24), the first surface 156 is substantially perpendicular to the first surface 156 within the same surface. As a result, a collision between a magnet (not shown) held by the first magnet holding part 162 and a magnet (not shown) held by the third magnet holding part 166 is avoided, and the magnets are projected 40. It can avoid or suppress that it collides with and is damaged.

  Here, as shown in FIG. 3, the projecting end portion 44 of the projecting portion 40 is substantially flat. The extending direction of the first magnet holding part 162 and the extending direction of the third magnet holding part 166 are non-parallel (obtuse angle) in the plane having the normal direction to the rotation axis Q direction. Therefore, when the protrusion 40 is perpendicular to the first surface 152 of the first magnet holding part 162 and perpendicular to the first surface of the third magnet holding part 166, the protrusion 40 is bent on the outer peripheral side in the surface. It becomes narrow toward 42. The projecting end portion 44 is substantially flat at a predetermined position in the narrow portion.

  Now, assuming that a straight line connecting the lower end of the protrusion 40 on the first magnet holding part 162 side and the lower end of the protrusion 40 on the third magnet holding part 166 side is the base part 46 of the protrusion 40, the protrusion 40 Exhibits a trapezoidal shape with the projecting end portion 44 and the base portion 46 being parallel sides in the plane. In the drawing, it is indicated by a one-dot chain line. By exhibiting such a simple shape, it becomes easy to punch out the magnet embedding hole 16 using a mold, and the protrusion 40 can be integrally formed. Further, since the base portion 46 is longer in the plane than the protruding end portion 44, the strength of the protruding portion 40 can be easily ensured. The same applies to the protrusion 30.

Second Embodiment
Although the said 1st Embodiment demonstrated the aspect in which the protrusion part 44 is exhibiting substantially flat, this invention is not limited to this. Here, the aspect from which the shape of a protrusion part differs as 2nd Embodiment of this invention is demonstrated. In the following embodiments, elements having the same functions as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 4 is an enlarged view of a partial region P of the rotor core 10 according to the second embodiment of the present invention, and is an enlarged view when the second embodiment of the present invention is applied to the region P in FIG. It is.

  As shown in FIG. 4, the protrusion 40A protruding from the radially inner side to the radially outer side in the region between the first magnet holding part 162 and the third magnet holding part 166 has the following structure. ing. That is, the projecting end portion 44A corresponding to the projecting end portion 44 shown in the first embodiment is substantially parallel to the surface facing the projecting end portion 44A in a plane whose normal is the rotation axis Q direction.

  Specifically, the projecting end portion 44 </ b> A is substantially parallel to the second surface 172 that faces the first surface 152 among the surfaces that define the first magnet holding portion 162, with the position corresponding to the outer peripheral side bent portion 42 as a boundary. A portion 62 </ b> A to be presented and a portion 66 </ b> A that is substantially parallel to the second surface 176 that faces the first surface 156 among the surfaces that define the third magnet holding portion 166 are provided. In short, it can be understood that the projecting end portion 44A and the outer peripheral side bent portion 42 are substantially parallel.

  By exhibiting such a structure, the gap width between the outer peripheral side bent portion 42 and the protruding end portion 44A can be secured at a certain value or more, so that the magnetic flux is not lowered and the leakage magnetic flux can be reduced.

<Third Embodiment>
In the second embodiment, as in the aspect described with reference to FIG. Therefore, when punching out the magnet embedding hole 16 with a mold, a burden may be imposed. Here, the aspect from which the shape of a protrusion part further differs as 3rd Embodiment of this invention is demonstrated.

  FIG. 5 is an enlarged view of a partial region P of the rotor core 10 according to the third embodiment of the present invention, and is an enlarged view when the third embodiment of the present invention is applied to the region P in FIG. It is.

  As shown in FIG. 5, the protrusion 40B protruding from the radially inner side to the radially outer side in the region between the first magnet holding part 162 and the third magnet holding part 166 has the following structure. That is, the projecting end portion 44B corresponding to the projecting end portion 44 shown in the first embodiment exhibits a concave arc centered on the outer peripheral side bent portion 42 in a plane whose normal is the rotation axis Q direction.

  Desirably, the radius of the concave arc is longer than the shortest distance from the edge of the projecting end portion 44B to the second surfaces 172 and 176. Thereby, since the width of the gap between the outer peripheral side bent portion 42 and the protruding end portion 44B can be secured at a certain value or more, the magnetic flux is not lowered and the leakage magnetic flux can be reduced. Moreover, since the protrusion 40B does not have an acute angle portion, it is easy to punch and mold with a mold.

<Fourth embodiment>
In the first to third embodiments, the protrusions 40, 40A, and 40B have been described as protruding from the radially inner side to the radially outer side. However, the present invention is not limited to this. Here, as a fourth embodiment of the present invention, an aspect in which the protrusions protrude from the radially outer side to the radially inner side will be described.

  FIG. 6 is an enlarged view of a partial region P of the rotor core 10 according to the fourth embodiment of the present invention, and an enlarged view when the fourth embodiment of the present invention is applied to the region P in FIG. It is.

  As shown in FIG. 6, the protrusion 40 </ b> C is formed in a region between the first magnet holding part 162 and the third magnet holding part 166 from the radially outer side to the radially inner side, specifically, from the inner circumferential side bent part 48. Protrusively toward.

  The protrusion 40 </ b> C has a second surface 172 opposite to the rotation axis Q in the surface defining the first magnet holding portion 162 and a rotation axis Q in the surface defining the third magnet holding portion 166. It is formed between the second surface 176 on the opposite side. The protrusion 40C is substantially perpendicular to the second surface 172 in the plane normal to the rotation axis Q direction at the end of the second surface 172 of the first magnet holding portion 162, and the third magnet holding portion At the end of the second surface 176 of 166 (the end opposite to the end 24), the second surface 176 is substantially perpendicular to the second surface 176 within the same surface. As a result, a collision between a magnet (not shown) held by the first magnet holding part 162 and a magnet (not shown) held by the third magnet holding part 166 is avoided, and the magnet is projected 40C. It can avoid or suppress that it collides with and is damaged.

  By providing the protrusion 40C on the radially outer side, the following advantages can be obtained compared to the case of providing the protrusion 40C on the radially inner side. That is, in order to ensure the gap width between the protrusion 40C and the first surfaces 152, 156 facing the protrusion 40C above a certain value, when the protrusion 44C of the protrusion 40C is substantially flat, Considering only the shortest distance from the edge to the first surfaces 152 and 156, the central portion of the protruding portion 44C is necessarily longer than the shortest distance, so the degree of freedom in designing the protruding portion 44C is increased.

  However, if the angle formed by the extending direction of the first magnet holding part 162 and the extending direction of the third magnet holding part 166 is reduced in the plane having the normal direction to the rotation axis Q direction, the protrusion 40C Since the length of the base 46D is shortened, it is necessary to appropriately select whether the protrusions 40, 40A, 40B are provided on the radially inner side or the protrusion 40C is provided on the radially outer side.

<Fifth Embodiment>
As shown in the fourth embodiment, when the protrusion 44C is substantially flat, the protrusion 40C is substantially perpendicular to each of the second surfaces 172 and 176. The edge has an acute angle, which may hinder the life of the mold. Here, the aspect which makes the shape of a protrusion part different from the said 4th Embodiment is demonstrated as 5th Embodiment of this invention.

  FIG. 7 is an enlarged view of a partial region P of the rotor core 10 according to the fifth embodiment of the present invention, and an enlarged view when the fifth embodiment of the present invention is applied to the region P in FIG. It is.

  As shown in FIG. 7, the protrusion 40 </ b> D is a region between the first magnet holding part 162 and the third magnet holding part 166, and the protrusion 40 </ b> D protruding from the radially outer side toward the inner peripheral bent part 48 is It has the following structure. That is, the projecting end portion 44D corresponding to the projecting end portion 44C shown in the fourth embodiment is substantially parallel to the surface facing the projecting end portion 44D in a plane whose normal is the rotation axis Q direction. In the case of the present embodiment, it is not always necessary to be parallel to the opposing surface, and it is only necessary to reduce the portion exhibiting an acute angle.

<Sixth Embodiment>
FIG. 8 is an enlarged view of a partial region P of the rotor core 10 according to the sixth embodiment of the present invention, and an enlarged view when the sixth embodiment of the present invention is applied to the region P in FIG. It is.

  As shown in FIG. 8, the protrusion 40 </ b> E is a protrusion 40 </ b> E that protrudes from the radially outer side toward the inner peripheral bent portion 48 in the region between the first magnet holding part 162 and the third magnet holding part 166. Has the following structure. That is, the projecting end portion 44E corresponding to the projecting end portion 44C shown in the fourth embodiment has a convex arc substantially parallel to the arc in contact with the inner circumferential side bent portion 48 in a plane whose normal is the rotation axis Q direction. Presents.

  Thus, the lifetime of a metal mold | die can be improved by exhibiting a convex arc.

<Modification>
As mentioned above, although the suitable aspect of this invention was demonstrated, this invention is not limited to this.

  FIG. 9 is a plan view of a part of a rotor core 10F according to a modification of the present invention. Although omitted from the overall view of the mode of FIG. 9, the state where the region separated by the AOB in FIG. 1 is looked down along the direction of the rotation axis Q is shown.

  In the modified example of the present invention, as shown in FIG. 9, the magnet embedding hole 16 (see FIG. 1) has two of the second magnet holding portion 164 </ b> F and the third magnet holding portion 166 </ b> F, and one bent portion 29 is formed. Presents. A protrusion 40 </ b> F is provided at a position corresponding to the bent portion 29. Specifically, a protrusion 40 </ b> F that protrudes toward the outer peripheral bent portion 42 is provided among the portions that define the bent portion 29.

  The protrusion 40F includes a first surface 154F on the rotation axis Q side of the surface defining the second magnet holding portion 164F and a first surface on the rotation axis Q side of the surface defining the third magnet holding portion 166F. 156F. The protrusion 40F has an end on the first surface 154F of the second magnet holding portion 164F (the end opposite to the end 22) and the first surface 154F within a plane normal to the rotation axis Q direction. It is substantially perpendicular, and is substantially perpendicular to the first surface 156F within the same surface at the end of the first surface of the third magnet holding portion 166F (the end opposite to the end 24). Thereby, a collision between a magnet (not shown) held by the second magnet holding part 164F and a magnet (not shown) held by the third magnet holding part 166F is avoided, and the magnet is a protrusion 40F. It can avoid or suppress that it collides with and is damaged.

  Here, the protruding end portion 44F of the protruding portion 40F is substantially flat, and considering the base portion 46F of the protruding portion 40F, the protruding portion 40F has a trapezoidal shape, but the above-described embodiments are applied. It doesn't matter.

  Here, the protruding end portion 44F of the protruding portion 40F has a substantially flat shape, and the protruding portion 40F has a trapezoidal shape in consideration of the base portion 46F of the protruding portion 40F. good.

It is a perspective view which illustrates the outline of the core for rotors. It is a top view of a part of core for rotors concerning a 1st embodiment of the present invention. FIG. 3 is an enlarged view of a part of the area in FIG. 2. It is an enlarged view of a partial region of a rotor core according to a second embodiment of the present invention. It is an enlarged view of a partial region of a rotor core according to a third embodiment of the present invention. It is an enlarged view of the one part area | region of the core for rotors which concerns on 4th Embodiment of this invention. It is an enlarged view of a partial region of a rotor core according to a fifth embodiment of the present invention. It is an enlarged view of a partial region of a rotor core according to a sixth embodiment of the present invention. It is a partial top view of the core for rotors which concerns on the modification of this invention. It is a top view which shows a part of conventional core for rotors. It is a top view which shows a part of conventional core for rotors. It is a top view which shows a part of core for rotors which provided the magnet holding protrusion in the aspect of FIG.

Explanation of symbols

10, 10F Rotor core 12 Shaft 14, 14F Columnar portion 140 Side surface 152, 154, 156, 154F, 156F First surface 16, 16F Magnet embedding hole 162, 164, 166, 164F, 166F Magnet holding portion 172, 174 176 Second surface 22, 24 End portion 25, 27, 29 Bent portion 30, 40, 40A, 40B, 40C, 40D, 40E, 40F Protruding portion 32, 42 Outer peripheral side bent portion 48 Inner peripheral side bent portion 44, 44A, 44B, 44C, 44D, 44E, 44F Tip 46, 46A, 46B, 46C, 46D, 46E, 46F Base

Claims (7)

Columnar portions (14, 14F) extending in a direction along the rotation axis (Q) of the shaft (12);
A magnet embedding hole having a plurality of magnet holding portions (162, 164, 166, 164F, 166F) extending in the direction on the rotating shaft side with respect to the side surface (140) opposite to the rotating shaft of the columnar portion. A rotor core (10, 10F) comprising a plurality of (16, 16F),
The magnet embedding hole is
A pair of end portions (22, 24) disposed on the side surface;
The first and second magnet holding portions corresponding to each of the end portions extending from the end portion toward the rotating shaft side while approaching each other from each of the end portions,
Bends (32, 42) between the first magnet holding part and the second magnet holding part;
The said bending part is a core for rotors which exhibits the protrusion (30, 40, 40A, 40B, 40C, 40D, 40E, 40F) which protrudes toward the inside of the said magnet embedding hole. The rotor core (10, 10F) according to claim 1,
The protrusions (30, 40, 40A, 40B, 40F) extend from the first surface (152, 154, 156, 154F, 156F) on the rotating shaft (Q) side of the surface defining the magnet embedding hole. A rotor core that protrudes toward a second surface (172, 174, 176) opposite to the first surface. A rotor core (10) according to claim 2,
The projecting end (44A; 62A, 66A) of the projecting part (40A) in a plane normal to the direction of the rotation axis (Q) is parallel to the second surface (172, 176) facing the projecting part. Presented core for rotors. A rotor core (10) according to claim 2,
The projecting end (44B) of the projecting part (40B) in a plane having the normal to the rotation axis (Q) direction is an outer peripheral side bent part (172, 176) facing the projecting part ( 42) A rotor core having a concave arc centered at 42). A rotor core (10) according to claim 1,
The protrusions (40C, 40D, 40E) are formed on the first surface toward the first surface (152, 154, 156) on the rotating shaft (Q) side of the surface defining the magnet embedding hole. And a rotor core that protrudes from the second surface (172, 174, 176) opposite to. A rotor core (10) according to claim 5,
The protrusion (44D) of the protrusion (40D) in a plane normal to the direction of the rotation axis (Q) is parallel to the first surface (152, 156) facing the protrusion. For core. A rotor core (10) according to claim 5,
The projecting end (44E) of the projecting part (40E) in a plane having the normal direction to the rotation axis (Q) is an inner circumferential bent part exhibited by the first surface (152, 156) facing the projecting part. A rotor core that exhibits a convex arc substantially parallel to (48).

Images