JP2013132138A - Rotor and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor which allows for easy formation of each core sheet composing a core in which a magnet is embedded and a core locking the magnet by using the same mold, and to provide a manufacturing method therefor.SOLUTION: In a rotor 10 where magnets 2 are embedded in a plurality of magnet holes 12 provided in a rotor core 11, and magnetic poles P of different polarities are arranged alternately in the direction of rotation, the rotor core 11 includes a cylindrical first core 11a having a plurality of magnet holes 12 penetrating in the axial direction, and a cylindrical second core 11b laminated on one or the other end face or both end faces of the first core 11a while having a plurality of holes 13 penetrating in the axial direction, where the dimensions of the inner and outer diameters are identical to those of the first core 11a. The number and width of the holes 13 are made identical to those of the magnet holes 12, and a part of the magnet 2 embedded in the magnet hole 12 is covered by a part of the second core 11b near the circumference of the hole 13.

Description

  The present invention relates to a rotor used in a radial gap type rotating electrical machine and a method for manufacturing the same.

  A radial gap type rotating electrical machine is a rotating electrical machine that includes a rotor that is arranged to be rotatable about a rotation axis, and a stator that is arranged with a gap in the radial direction of the rotor. As one of such rotating electric machines, a rotating electric machine called an interior magnet type (IPM) is known. In an embedded magnet type rotating electrical machine, magnets such as permanent magnets are embedded in a plurality of magnet holes provided in a rotor core formed by laminating a plurality of core sheets formed of electromagnetic steel sheets in a predetermined shape in the axial direction of a rotating shaft. And a rotor having magnetic poles of different polarities arranged alternately in the rotation direction.

  Conventionally, in a rotor of an embedded magnet type rotating electrical machine, in order to suppress magnetic flux leakage and prevent a magnetic pole from being short-circuited, non-magnetic end plates are provided at both ends in the axial direction of the rotor core to prevent the magnet from being removed. . However, since the nonmagnetic material used as the material for the end plate is more expensive than the magnetic material, the material cost is increased. Further, in the manufacturing process of the rotor, a process for attaching the end plate to the rotor core is required separately, which increases the number of steps and at the same time increases the production cost. For this reason, the use of a non-magnetic end plate as a magnet retaining means has been one factor that increases the product cost.

  Therefore, a core (core b) having a magnetic flux short-circuit prevention hole having a hole width smaller than that of the magnet hole is disposed at an end portion in the axial direction of the core (core a) in which the magnet is embedded in the magnet hole. A rotor having a rotor core is disclosed in Patent Document 1 below. According to such a rotor, the core b serves as an end plate by covering the magnet embedded in the magnet hole provided in the core a with the core b. For this reason, it becomes possible to prevent the magnet from being removed without using a non-magnetic end plate, and the product cost can be reduced.

  However, in the core a and the core b described above, since the hole widths of the magnet hole and the hole are different from each other, even if each core sheet constituting the core a and the core b is formed from the same electromagnetic steel sheet. However, a dedicated die for punching these holes is required separately. Therefore, the equipment cost required for preparing the dedicated mold is increased, and at the same time, the man-hour for switching the mold at the time of punching formation of each core sheet is increased, and the control of the mold becomes complicated.

JP 2001-086674 A

  The present invention has been made in view of such circumstances, and in the rotor core, each core sheet constituting the core in which the magnet is embedded and the core for retaining the magnet can be easily used by using the same mold. An object of the present invention is to provide a rotor that can be formed and a method for manufacturing the same.

  The rotor of the present invention has the following characteristics. That is, the present invention relates to a rotor core formed by laminating a plurality of core sheets formed of electromagnetic steel sheets in a predetermined shape in the axial direction of the rotation shaft, and a plurality of magnets embedded in a plurality of magnet holes provided in the rotor core. A rotor having magnetic poles of different polarities alternately arranged in the rotation direction, the rotor core having a plurality of the magnet holes penetrating in the axial direction, and the first core A cylindrical second core that is laminated on one end surface or the other end surface or both end surfaces, and has a plurality of holes penetrating in the axial direction and having the same inner diameter and outer diameter as the first core. The number of holes and the width of the holes are the same as the number of magnet holes and the width of the holes, and are embedded in the magnet holes by a part of the second core in the vicinity of the periphery of the holes. A part of the magnet is covered.

  The first core and the second core are configured by the core sheet having the same shape, and the air holes are disposed at positions shifted relative to the magnet holes in the surface direction of the core sheet. ing.

  The rotor core includes a plurality of shaft holes through which a shaft portion having a predetermined length provided in a fixing member that penetrates in an axial direction from one end surface to the other end surface and fixes the first core and the second core is inserted. The shaft hole includes a plurality of shaft hole portions formed at predetermined positions of the core sheet and arranged in communication in the axial direction across the first core and the second core, and the shaft hole portion includes the first core. Is arranged at a position shifted by a predetermined angle in the rotation direction from the pole center of the magnetic pole adjacent to the pole center or in the circumferential direction, and in the second core, in the pole center or circumferential direction of the magnetic pole. It is arranged at a position shifted by a predetermined angle in the direction opposite to the rotation direction from between the adjacent magnetic poles.

  The second core is stacked with a predetermined angle shifted from the n magnetic pole pitch (n is an integer) with respect to the first core in the rotational direction or the opposite direction.

  The core sheet penetrates in an axial direction from one end surface to the other end surface of the rotor core, and a plurality of shaft portions having a predetermined length provided in a fixing member for fixing the first core and the second core are inserted. A plurality of shaft hole portions constituting the shaft hole, or a plurality of protrusion portions for caulking each core sheet adjacent in the axial direction are provided, and the shaft hole portion or the protrusion portions are provided at predetermined positions of the core sheet. The first shaft hole or the first protrusion and the position shifted from the n magnetic pole pitch (n is an integer) by a predetermined angle with respect to the first shaft hole or the first protrusion in the rotational direction or the opposite direction. A second shaft hole portion or a second projection portion provided in the second core, and the first shaft hole portion or the first projection portion in the second core is the second shaft in the first core. It is laminated corresponding to the hole or the second protrusion.

  The core sheet includes the magnet hole and the air hole, and includes a magnet hole portion having a different peripheral shape depending on a magnetic pole, and the second core rotates n magnetic pole pitches (n is an integer) with respect to the first core. The direction is shifted or vice versa.

  The core sheet constitutes the magnet hole and the hole, and the peripheral shape thereof is the same, and the magnet hole part is asymmetric with respect to a straight line passing through the pole center of the magnetic pole and the axis of the rotating shaft The magnet hole in the first core and the hole in the second core are arranged symmetrically with respect to the straight line.

  The first core and the second core are composed of the core sheets having different shapes, and the planar shapes of the first core and the second core are only the planar shapes of the magnet hole and the air hole. Is different.

  A portion of the second core that is positioned on the outer side in the radial direction than the hole is disposed on the outer side in the radial direction with respect to the peripheral edge of the magnet hole that is positioned on the inner peripheral side of the first core.

  The core sheet is made of a magnetic steel sheet having a thickness of 0.5 mm or more.

  An end plate made of a non-magnetic material is provided on one end surface or the other end surface of the rotor core.

  The rotor core is disposed on the one end side or the other end side in the axial direction from the opposed portion, facing the stator disposed with a gap of a predetermined interval in the radial direction with respect to the outer peripheral surface, A non-opposing portion disposed so as to protrude in the axial direction with respect to the stator, and the end plate is disposed at an end portion in the axial direction on the opposite side of the facing portion from the non-opposing portion. Yes.

  The holes are arranged so as to be offset in the direction opposite to the rotation direction with respect to the magnet holes, and the second core is arranged with a gap of a predetermined interval in the radial direction with respect to the outer peripheral surface of the rotor core. Opposite the stator.

  The rotor manufacturing method of the present invention has the following characteristics. That is, according to the present invention, magnets are embedded in a plurality of magnet holes provided in a rotor core formed by laminating a plurality of core sheets formed of electromagnetic steel sheets in a predetermined shape in the axial direction of a rotating shaft, and magnetic poles having different polarities are A method of manufacturing a rotor arranged alternately in a rotation direction, the first step of preparing the electromagnetic steel sheet, and punching the electromagnetic steel sheet with a predetermined mold to form a peripheral portion of the core sheet, A second step of forming a predetermined shape of the magnet hole portion penetrating in the axial direction at a predetermined position, and a plurality of core sheets are laminated so that the magnet hole portion communicates in the axial direction, and a plurality of the core holes are penetrated in the axial direction. A third step of preparing a cylindrical first core having the magnet holes, and a plurality of the core sheets are laminated so that the magnet hole portions communicate in the axial direction, or one core sheet is prepared. Penetrate in the axial direction A fourth step of preparing a cylindrical second core having a plurality of holes and having the same inner and outer diameters as the first core; and the magnets in the magnet holes of the first core. By embedding and arranging the second core in a predetermined positional relationship with one end surface or the other end surface or both end surfaces of the first core, the second core in the vicinity of the peripheral edge of the hole A fifth step of partially covering the part of the magnet embedded in the magnet hole.

  The core sheets formed in the second step all have the same shape, and in the fifth step, the holes are arranged at positions relatively displaced in the surface direction of the core sheet with respect to the magnet holes. To do.

  In the second step, a plurality of shaft portions of a predetermined length that penetrates in the axial direction from one end surface to the other end surface of the rotor core and are provided in a fixing member that fixes the first core and the second core are inserted. A shaft hole portion forming step of forming a plurality of shaft hole portions constituting the shaft hole at a predetermined position of the core sheet, and in the shaft hole portion forming step, the shaft hole portion is formed of the magnetic pole in the core sheet. In the fifth step, the second core is turned upside down with respect to the first core at a position shifted by a predetermined angle in the rotation direction or the opposite direction from between the poles adjacent to each other in the pole center or circumferential direction. Laminate to.

  In the fifth step, the second core is stacked while being rotated in the rotational direction or the opposite direction by an angle shifted from the n magnetic pole pitch (n is an integer) with respect to the first core by a predetermined angle.

  In the second step, a plurality of the magnet hole portions having different peripheral shapes depending on the magnetic poles are formed at predetermined positions of the core sheet, and in the fifth step, the second core is formed with n magnetic poles with respect to the first core. Lamination is performed by rotating in the rotation direction or the opposite direction by the pitch (n is an integer).

  In the second step, a plurality of the magnet hole portions that have the same peripheral shape and are asymmetric with respect to a straight line passing through the pole center of the magnetic pole and the axis of the rotation shaft are arranged at predetermined positions of the core sheet. In the fifth step, the second core is laminated upside down with respect to the first core.

  The core sheet formed in the second step is different in shape between the core sheet constituting the first core and the core sheet constituting the second core, and only the magnet hole portion is different. Form.

  In the second step, as the mold, a fixed mold in which a punching position with respect to the electromagnetic steel sheet is fixed and a movable mold that can relatively change the punching position with respect to the electromagnetic steel sheet are used, and the fixed mold is used. The peripheral edge of each core sheet is formed by the above, the magnet hole of each core sheet is formed by the movable mold, and the movable mold is formed when the core sheet constituting the second core is formed. The magnet hole is formed by rotating it by a predetermined angle in the rotation direction or in the opposite direction.

  In the second step, when the core sheet constituting the second core is formed, the movable mold is translated by a predetermined distance along the direction intersecting the longitudinal direction of the magnet hole, and the magnet hole is formed. Form.

  According to the rotor and the manufacturing method thereof according to the present invention, in the rotor core including the first core in which the magnet is embedded in the magnet hole and the second core for retaining the magnet, the number of the magnet holes provided in the first core and the By configuring the hole width and the number of holes provided in the second core and the hole width to be the same, each core sheet constituting the first core and the second core can be formed using the same mold. It becomes possible. Thereby, the equipment cost and product cost which are required for the preparation of a dedicated mold can be reduced. In addition, it is possible to reduce the man-hours for switching the die in the core sheet punching process and at the same time, it is very easy to control the die, so that the production efficiency of the product can be greatly improved.

  In the present invention, if the first core and the second core are composed of a core sheet having the same shape, the punching process of the core sheet can be carried out in a single manner, so that the production efficiency can be further improved. Further, when the magnet is retained by the second core made of the core sheet having the same shape, if the hole is arranged at a position relatively displaced in the surface direction of the core sheet with respect to the magnet hole, the second from the magnet. Magnetic flux leakage to the core is suppressed. Thereby, the deterioration of the magnetic characteristics of the rotor is effectively reduced, and the performance of the rotating electrical machine can be improved.

  In the core sheet constituting the first core and the second core, each axial hole portion is positioned at a position shifted by a predetermined angle in the rotation direction from the pole center of the magnetic pole or between the poles adjacent in the circumferential direction in the first core. If the second core is disposed at a position shifted by a predetermined angle in the direction opposite to the rotation direction from the pole center of the magnetic pole or between the poles adjacent to each other in the circumferential direction in the second core, the second core relative to the first core Positioning can be performed very easily and accurately. Specifically, the positioning of each shaft hole for inserting the shaft portion of the fixing member by laminating the front and back relations of one surface and the other surface of the core sheet on the opposing surfaces of the first core and the second core. Using this, the hole can be positioned with respect to the magnet hole. Thereby, extremely accurate positioning can be reliably performed while positioning of the hole with respect to the magnet hole is substantially omitted.

  The same effect can be obtained even if the second core is laminated so as to be shifted from the n magnetic pole pitch (n is an integer) by a predetermined angle with respect to the first core in the rotational direction or the opposite direction. In this case, accurate positioning of the second core with respect to the first core is required, but, for example, by arranging the shaft hole portion and the caulking projection forming the shaft hole described above at a predetermined position of the core sheet, The positioning can be performed easily and accurately.

  Magnet holes having different peripheral shapes are formed in the core sheet, and the second core is laminated so as to be shifted with respect to the first core in the n magnetic pole pitch (n is an integer) rotation direction or the opposite direction. The same effect can be obtained. In this case, it is possible to accurately position the second core with respect to the first core without providing the above-described positioning means by making the peripheral shape and arrangement of the magnet holes provided in each core sheet different. Moreover, since it is not necessary to provide a positioning means in particular, the core sheet punching step in the second step can be greatly simplified.

  In addition, if the first core and the second core are formed of core sheets having different shapes, a step of laminating the second core on one end surface or the other end surface or both end surfaces of the first core to prevent the magnet from being removed. It can be simplified. Specifically, positioning of the second core relative to the first core can be omitted by making the planar shapes of the first core and the second core different from each other only in the planar shapes of the magnet hole and the hole. .

It is sectional drawing along the (a) top view and (b) II line which show the rotor which concerns on 1st embodiment. It is the top view which shows (a) one side of the core sheet which concerns on 1st embodiment, and (b) the other side. It is a top view which shows the rotor which concerns on 2nd embodiment. It is a top view which shows the core sheet which concerns on 2nd embodiment. It is a top view which shows the rotor which concerns on 3rd embodiment. It is a top view which shows the core sheet which concerns on 3rd embodiment. It is a top view which shows the modification of the rotor which concerns on 3rd embodiment, and sectional drawing along the IIa-IIa line. It is a top view which shows the modification of the core sheet which concerns on 3rd embodiment, and sectional drawing along the IIb-IIb line. It is a top view which shows the rotor which concerns on 4th embodiment. It is a top view which shows the core sheet which concerns on 4th embodiment. It is a top view which shows the 1st modification of the rotor which concerns on 4th embodiment. It is a top view which shows the 1st modification of the core sheet which concerns on 4th embodiment. It is a top view which shows the 2nd modification of the rotor which concerns on 4th embodiment. It is a top view which shows the 2nd modification of the core sheet which concerns on 4th embodiment. FIG. 6A is a plan view showing a third modification of the rotor according to the fourth embodiment, and FIG. 5B is a cross-sectional view taken along line III-III. It is a top view which shows the 3rd modification of the core sheet which concerns on 4th embodiment. It is a top view which shows the 4th modification of the rotor which concerns on 4th embodiment. It is a top view which shows the 4th modification of the core sheet which concerns on 4th embodiment. It is a top view which shows the 5th modification of the rotor which concerns on 4th embodiment. It is a top view which shows the 5th modification of the core sheet which concerns on 4th embodiment. It is a top view which shows the 6th modification of the rotor which concerns on 4th embodiment. It is a top view which shows the 6th modification of the core sheet which concerns on 4th embodiment. It is a top view which shows the rotor which concerns on 5th embodiment. It is a top view which shows the core sheet which concerns on 5th embodiment. It is a top view which shows the modification of the rotor which concerns on 5th embodiment. It is a top view which shows the modification of the core sheet which concerns on 5th embodiment. It is a top view which shows the rotor which concerns on 6th embodiment. It is a top view showing the metallic mold for forming the core sheet which constitutes the 1st core concerning a 6th embodiment, and the core sheet concerned. It is a top view showing the metallic mold for forming the core sheet which constitutes the 2nd core concerning a 6th embodiment, and the core sheet concerned. It is a top view which shows the 1st modification of the rotor which concerns on 6th embodiment. It is a top view showing the metallic mold for forming the core sheet which constitutes the 1st core concerning the 1st modification of a 6th embodiment, and the core sheet concerned. It is a top view showing the metallic mold for forming the core sheet which constitutes the 2nd core concerning the 1st modification of a 6th embodiment, and the core sheet concerned. It is a top view which shows the 2nd modification of the rotor which concerns on 6th embodiment. It is the metal mold | die for forming the core sheet which comprises the 1st core which concerns on the 2nd modification of 6th embodiment, and the top view which shows the said core sheet. It is a top view showing the metallic mold for forming the core sheet which constitutes the 2nd core concerning the 2nd modification of a 6th embodiment, and the core sheet concerned.

  Hereinafter, embodiments of a rotor according to the present invention will be described with reference to the drawings. In the following description, “axial direction” refers to a direction parallel to the axis O of the rotary shaft 1, and “rotational direction” refers to a clockwise direction around the axis O of the rotary shaft 1 or One of the counterclockwise directions shall be indicated.

  As shown in FIG. 1, the rotor 10 according to the first embodiment includes an integrated rotor core 11 and a plurality of magnets 2 embedded in a plurality of magnet holes 12 provided in the rotor core 11. It is an inner rotor. In the rotor 10, the rotary shaft 1 is connected and fixed to a circular hole provided in the center of the rotor core 11, and rotates in a predetermined rotation direction about the axis O of the rotary shaft 1. In the rotor 10, four magnetic poles P having different polarities are alternately arranged in the rotation direction on the outer peripheral surface of the rotor core 11, and the outer peripheral surface is opposed to a stator (not shown) of the rotating electrical machine with a predetermined gap therebetween. Are arranged. In the rotor 10, the number of magnetic poles P is not particularly limited as long as it is an even number. For example, the design can be appropriately changed according to the number of slots in the stator, the magnetic force of the magnet 2, the use of the rotating electrical machine, and the like.

  The rotor core 11 is formed by laminating a large number of core sheets S, in which the surface is insulated and formed of a soft magnetic electromagnetic steel sheet having a thickness of about 0.3 to 0.5 mm in a predetermined shape, in the axial direction of the rotary shaft 1. It consists of The rotor core 11 according to the present embodiment includes a cylindrical first core 11a having a plurality of magnet holes 12 penetrating in the axial direction and a plurality of holes 13 penetrating in the axial direction, and dimensions of an inner diameter and an outer diameter. Includes a cylindrical (annular) second core 11b that is the same as the first core 11a.

  The first core 11 a is disposed at an intermediate portion in the axial direction of the rotor core 11. In the first core 11a, a portion located radially outside the magnet holes 12 is magnetized by the magnet 2 to form a magnetic pole P. In the present embodiment, in order to suppress magnetic flux leakage from the magnet 2, four magnet holes 12 having a substantially concave shape in plan view and provided with flux barriers at both ends are provided at equal pitches in the circumferential direction. The flux barrier formed in each magnet hole 12 extends toward the outer peripheral surface of the first core 11a. Further, the shortest distances in the radial direction from the axis O of the rotating shaft 1 to the magnet holes 12 are all equal.

  The inner and outer diameters of the first core 11a are: the diameter of the rotary shaft 1, the size of the space formed on the inner peripheral side (tooth tip side) of the stator, and the size of the gap formed between the first core 11a and the stator. It is designed appropriately according to the above. In addition, the stack thickness (the height in the axial direction) of the first core 11 a can be appropriately changed by adjusting the number of core sheets S to be laminated according to the size of the magnet 2 embedded in the magnet hole 12. Is possible.

  The second core 11b is disposed at both ends of the rotor core 11 in the axial direction, and sandwiches the first core 11a. The holes 13 provided in the second core 11b have the same configuration as the magnet holes 12 except for the depth dimension of the holes in the axial direction. That is, the number of holes 13 provided in the second core 11b and the hole width thereof are the same as the number of magnet holes 12 provided in the first core 11a and the hole width thereof. Furthermore, in this embodiment, the planar shape of the holes 13 and the arrangement of the holes 13 in the second core 11b are the same as the planar shape of the magnet holes 12 and the arrangement of the magnet holes 12 in the first core 11a.

The second core 11 b is laminated on both end surfaces of the first core 11 a with the holes 13 being disposed at positions that are displaced relative to the magnet holes 12 in the surface direction of the core sheet S. The “surface direction” here means an arbitrary direction along a plane parallel to one surface and the other surface of the core sheet S. In the present embodiment, the hole 13 is disposed at a position relatively rotated by an angle θ _{1 in the} counterclockwise direction with respect to the magnet hole 12 around the axis O of the rotation shaft 1. At this time, a part of the magnet 2 embedded in the magnet hole 12 is covered with a part of the second core 11 b in the vicinity of the periphery of the hole 13. Thus, removal of the magnet 2 embedded in the magnet hole 12 is performed by the second core 11b. In other words, the second core 11b has a function as an end plate.

Moreover, in this embodiment, the part located in the radial direction outer side than the air hole 13 of the second core 11b is on the outer side in the radial direction than the peripheral edge of the magnet hole 12 located on the inner peripheral side of the first core 11a. Has been placed. By stacking the second core 11b on the first core 11a in such a positional relationship, a short circuit of the magnetic pole P can be avoided and magnetic flux leakage from the magnet 2 can be effectively suppressed. This positional relationship is one of the conditions for positioning each hole 13 with respect to each magnet hole 12. That is, in the present embodiment, the relative rotation angle θ _{1 of the} hole 13 with respect to the magnet hole 12 is determined so as to satisfy the positional relationship.

  As for the stack thickness (the height in the axial direction) of the second core 11b, the minimum required stack thickness may be used as long as the function as an end plate is ensured. Specifically, the second core 11b may have a thickness that can maintain mechanical strength that can avoid deformation due to the force acting on the magnet 2. Therefore, the second core 11b may be composed of only one core sheet S, or may be composed of two or three or more core sheets S. When the second core 11b is composed of only one core sheet S, the thickness of the core sheet S may be at least 0.5 mm or more in order to ensure strength. Moreover, the mechanical strength of the 2nd core 11b can be raised more by increasing the number of components of the core sheet S in the 2nd core 11b.

  In the rotor core 11 of the present embodiment, the first core 11a and the second core 11b are fixed to each other by a fixing member F having a shaft portion s having a predetermined length. Specifically, a plurality of shaft holes 14 penetrating in the axial direction from one end surface to the other end surface of the rotor core 11 are provided. The shaft portion s of the fixing member F is inserted into the shaft hole 14 and the shaft portion s is inserted. The first core 11a and the second core 11b are fixed in the axial direction by predetermined fixing means provided at both ends of the first core 11a. Therefore, the position of each shaft hole 14 in the first core 11a and the position of each shaft hole 12 in the second core 11b coincide with each other in the axial direction. Examples of the fixing member F include caulking pins, bolts and nuts.

Furthermore, the rotor core 11 of this embodiment is comprised by the core sheet S of the same plane shape with the 1st core 11a and the 2nd core 11b. Specifically, as shown in FIG. 2, respectively provided in a plurality predetermined position the magnet holes H _M and a shaft hole portion H _A is the inner periphery and the outer periphery of (four in this embodiment) extending in the axial direction An annular core sheet S ₁ is used.

In the core sheet S _1, each magnet hole H _M is formed in plan view substantially recessed flux barriers are provided at both ends, are each provided at a constant pitch in the circumferential direction. Further, the shortest distance in the radial direction of the center point of the core sheet S ₁ (corresponding to the axis O of the rotating shaft 1) to each magnet hole H _M is all equal. By each magnet hole H _M provided on the core sheet S ₁ is being arranged communicating axially, the magnet holes 12 in the first core 11a, and the holes 13 in the second core 11b are formed.

On the other hand, in the core sheet S ₁ , each shaft hole H _A is formed in a circular shape in a plan view whose diameter is equal to the diameter of the shaft s of the fixing member F, and each magnet hole H _M Similarly, each is provided at equal pitches in the circumferential direction. Further, the distances from the center point of the core sheet S _{1 to} the center point of each shaft hole _HA are all equal. That is, the center point of each shaft hole portion H _A is disposed concentrically circumference of the inner periphery and outer periphery of the core sheet S _1. Each shaft hole portion H _A provided on the core sheet S ₁ is by being arranged communicating axially, the axial hole 14 of the first core 11a and the second core 11b are formed.

Core sheet S ₁ of the embodiment, characterized in that the axial hole portion H _A has from between the poles P circumferentially adjacent poles are disposed at a position shifted by a predetermined angle in the rotational direction or the reverse direction thereof There is. The term the "machining gap", on a line segment L connecting the midpoint M of the pole center P _C of the magnetic poles P adjacent to each other in the circumferential direction in the outer periphery of the core sheet S _1, and the center point of the core sheet S ₁ Says the position. Further, The "position of the shaft hole portion H _A" is intended to mean a circumferential direction position in the core sheet S ₁ of the axial hole portion H _A, the center point of each shaft hole portion H _A The position of is the reference.

That is, assuming that the rotation direction of the rotor 10 is a clockwise direction centering on the axis O of the rotation shaft ₁ , on one surface of the core sheet S1, as shown in FIG. It can be said that the hole _HA is disposed at a position shifted by a predetermined angle θ _{1/2 in the} rotational direction from between the poles of the magnetic poles P adjacent in the circumferential direction. On the other hand, on the other surface of the core sheet S ₁ , as shown in FIG. 2 (b), each shaft hole _HA is at a predetermined angle in the direction opposite to the rotation direction from between the poles of the magnetic pole P adjacent in the circumferential direction. It is arranged at a position shifted by θ _1/2 . Even if it is assumed that the rotation direction of the rotor 10 is the counterclockwise direction around the axis O of the rotation shaft 1, the same can be said. In this case, front and back relationship of one surface and the other surface of the core sheet S ₁ is reversed.

Here, in the rotor core 11 of the present embodiment, the first core 11a, the second core 11b are both composed of a core sheet S ₁ of the same planar shape. The first core 11a and the second core 11b has one surface and the other other side of the core sheet S ₁ of one core sheet S ₁ is laminated so as to face each other. Therefore, one side of the core sheet S ₁ is in one of the end faces of each of the first core 11a and the second core 11b is the other surface of the core sheet S ₁ is arranged on the other. In the present embodiment, the front and back relations between the opposing surfaces of the first core 11a and the second core 11b are the same (that is, the core sheet S _{1 on} each end face of the first core 11a and the second core 11b). The rotor core 11 is formed by laminating the second core 11b on both end faces of the first core 11a so that the one surface and the other surface face each other.

Further, as described above, in order to fix the first core 11a and the second core 11b with the fixing member F, each shaft hole 14 provided in each of the first core 11a and the second core 11b has one rotor core 11 part. It is necessary to penetrate from the end face to the other end face in the axial direction. In the present embodiment, since the opposing surfaces of the first core 11a and the second core 11b that face each other have the same front and back relationship, the magnet holes 12 are simultaneously formed when the shaft holes 14 are arranged at predetermined positions. Positioning of the air holes 13 with respect to is necessarily completed. That is, if each shaft hole 14 provided in each of the first core 11a and the second core 11b is arranged so as to communicate in the axial direction, the air hole 13 is always in the axis of the rotary shaft 1 with respect to the magnet hole 12. It is disposed at a position relatively rotated by an angle θ ₁ in the rotation direction around the center O or in the opposite direction.

  Here, like the rotor 10 of this embodiment, the outer peripheral surfaces of the first core 11a and the second core 11b constituting the rotor core 11 are both separated from the stator (not shown) of the rotating electrical machine by a predetermined gap. When facing each other, it is desirable that the air holes 13 are arranged so as to be shifted in the direction opposite to the rotation direction of the rotor 10 with respect to the magnet holes 12. Thereby, the utilization efficiency of the reluctance torque in the 2nd core 11b can be improved. The reason is as follows.

  When the holes 13 are arranged as described above, the phase of the q-axis of the second core 11b is shifted in the direction opposite to the rotation direction, so that the second core 11b is a core whose current phase has advanced by this shift. The reluctance torque increases at a phase advanced from the magnet torque of the first core 11a. In the present embodiment, since the number of magnetic poles P of the rotor 10 is 4, the first core 11a in which the magnet 2 is embedded has a current phase between 0 ° and 45 ° from the q axis of the first core 11a. Torque is maximized. On the other hand, if the phase of the q axis of the second core 11b is the same as the phase of the q axis of the first core 11a, the reluctance torque of the second core 11b is maximum when the current phase is 45 ° from the q axis. It becomes. For this reason, by arranging the second core 11b so as to be shifted in the reverse direction of the rotation direction, when the current phase is maximized in the first core 11a, the second core 11b approaches the current phase where the reluctance torque is maximized. Because.

In the present embodiment, the shaft hole portion H _A may be disposed at a position shifted by a predetermined angle in the rotational direction or the reverse direction thereof from the center of a pole P _C of each pole P. The "pole center" as used herein means the center of a pole P _C of the magnetic poles P of the outer periphery of the core sheet S _1, the position on the line segment (not shown) connecting the center point of the core sheet S _1. Even in such a case, the functions and functions exhibited when the second core 11b is stacked on the first core 11a are the same.

  Next, an embodiment of a method for manufacturing a rotor according to the present invention will be described. In the following description, the method for manufacturing the rotor 10 (see FIGS. 1 and 2) according to the first embodiment will be described as an example. The method for manufacturing the rotor 10 according to this embodiment includes at least the first to fifth steps shown below.

First, as a first step, an electromagnetic steel sheet to be processed is prepared. The plate | board thickness of the electromagnetic steel plate prepared in a 1st process is 0.3-0.5 mm, for example. Thickness of the electromagnetic steel sheet is mainly configured number of core sheet S ₁ in the second core 11b, it is selected as appropriate in consideration of the mechanical strength and the like required of the second core 11b. The plate width of the electromagnetic steel sheet is appropriately selected in consideration of the yield (for example, core removal according to the shape of the mold to be used). Moreover, when performing a 2nd process and subsequent steps with a progressive die, it is desirable to use a magnetic steel sheet continuous in a hoop shape.

Next, as a second step, by punching magnetic steel sheets at a predetermined die, to form a peripheral edge of the core sheet S _1, to form a magnet hole H _M having a predetermined shape extending in the axial direction in a predetermined position . In the present embodiment, to form a peripheral edge of the core sheet S ₁ in a ring shape having an inner periphery and the outer periphery of a predetermined size, to form four magnet holes H _M in plan view substantially recessed. Each magnet hole H _M is formed between the inner periphery and the outer periphery which constitutes the periphery of the core sheet S _1, at equal intervals, each in a circumferential direction and each magnet hole from the center point of the core sheet S ₁ the shortest distance in the radial direction to the part H _M is formed in all equal position.

Further, in the present embodiment, a shaft hole forming step of forming a plurality of axial hole portion H _A in a predetermined position of the core sheet S ₁ is included in the second step. In the shaft hole portion forming step of the present embodiment, four shaft hole portions _HA are formed in a circular shape in plan view. Each shaft hole portion H _A is formed between the inner periphery and the outer periphery which constitutes the periphery of the core sheet S _1, at equal intervals, respectively in the circumferential direction, and each shaft hole from the center point of the core sheet S ₁ distance all equal position to the center point of part H _a (i.e., the core inner and concentric circumference of the outer periphery of the sheet S ₁₎ is formed. Further, each shaft hole _HA is formed at a position shifted by a predetermined angle θ _{1/2 in the} rotation direction or the opposite direction from the gap between the magnetic poles P adjacent in the circumferential direction. Each shaft hole _HA may be formed at a position shifted from the pole center P _C of each magnetic pole P by a predetermined angle θ _{1/2 in the} rotational direction or in the opposite direction.

The multiple core sheets S ₁ formed in the second step all have the same planar shape. Accordingly, in this embodiment, it may be punching all the core sheet S ₁ in a mold of the same (or the same punching shape). As a mold used in the second step, for example, each component of the core sheet S ₁ (annular peripheral edge, each magnet hole H _M , each shaft hole H _A ) is punched once with respect to the electromagnetic steel sheet. An integral mold that can be stamped and formed at the same time is used. Alternatively, a plurality of molds to partially correspond to the components of the core sheet S _1, it may be configured such that each component of the core sheet S ₁ is being phased punching.

Subsequently, as a third step, a cylindrical first core 11a having a plurality of magnet holes 12 penetrating in the axial direction is prepared. The first core 11a is formed by stacking such a plurality of core sheets S ₁ formed in the second step the magnet holes H _M and a shaft hole portion H _A communicates with the axial direction. The number of core sheets S ₁ necessary for forming the first core 11 a is appropriately adjusted according to the size of the magnet 12 embedded in each magnet hole 12. First core 11a to be prepared in the third step, for example, bonding using an insulating film is melted, the welding for between each core sheet S ₁ which is adjacent to the axially laminated, by a method such as varnish impregnated, laminated it can be integrated each core sheet S ₁ has.

Similarly, as a fourth step, a cylindrical second core 11b having a plurality of holes 13 penetrating in the axial direction and having the same inner diameter and outer diameter as the first core 11a is prepared. The second core 11b has a plurality formed in the second step (e.g., two or three sheets of about, or more sheets) core sheet S ₁ the magnet holes H _M and a shaft hole portion H _A is the axial direction of the It is formed by stacking so as to communicate with each other. The number of core sheet S ₁ required to form the second core 11b is adjusted appropriately according to the mechanical strength required as a second core 11b. Second core 11b to be prepared in the fourth step, in the same manner as in the first core 11a, each core sheet S ₁ that are stacked may be integrated. Also, if it is possible to satisfy a sufficient mechanical strength required as the second core 11b single core sheet S ₁ only, by preparing a single core sheet S _1, the second core The preparation of 11b is completed.

In the present embodiment, as described above, the same core sheet S ₁ is used in the third step and the fourth step. Therefore, for the first core 11a and the second core 11b prepared in the third step and the fourth step, the number of magnet holes 12 and the hole width thereof are the same as the number of holes 13 and the hole width thereof, respectively. It becomes. Furthermore, the planar shape of the magnet holes 12 and the arrangement of the magnet holes 12 in the first core 11a are the same as the planar shape of the holes 13 and the arrangement of the holes 13 in the second core 11b.

As the fifth step, the magnet 2 is embedded in each magnet hole 12 provided in the first core 11a prepared in the third step, and the second core 11b prepared in the fourth step is replaced with the first core 11a. By arranging and laminating in a predetermined positional relationship with respect to the both end surfaces of the, the part of the magnet 2 embedded in the magnet hole 12 is covered with a part of the second core 11 b in the vicinity of the peripheral edge of the hole 13. Specifically, the holes 13 are arranged at positions that are relatively displaced in the surface direction of the core sheet S ₁ with respect to the magnet holes 12. In the present embodiment, the positioning of the hole 13 with respect to the magnet hole 12 is performed in the following procedure.

In the present embodiment, in the fifth step, the second core 11b is laminated upside down with respect to the first core 11a. As described above, the first core 11a and the second core 11b is one side of the core sheet S ₁ is in one of the both end faces, the other face of the core sheet S ₁ is arranged on the other. Therefore, the second cores 11b, if stacked upside down with respect to the first core 11a, in each of the opposed surfaces will be one side each other and other surfaces of the core sheet S ₁ is opposed to each other, between the facing surfaces The front / back relationship is the same.

The timing for turning the second core 11b upside down with respect to the first core 11a is not particularly limited. For example, if the second core 11b is composed of a plurality of core sheets S _1, a second core 11b by laminating those in advance turned over each core sheet S ₁ which is punched sequentially in a second step Alternatively, the second core 11b that has already been prepared in the fourth step may be turned over and stacked on the end surface of the first core 11a.

Alternatively, in a second step, in the case of using a plurality of molds to partially correspond to the components of the core sheet S _1, one of the mold corresponding to the magnet holes H _M or the shaft hole portion H _A, constituted by a movable mold which can alter relatively punching position relative to the electromagnetic steel sheets, a punching position in the core sheet S ₁ formed when constituting the first core 11a and the core sheet S ₁ formed when forming the second core 11b You may make it relatively different. Even in such a case, it is substantially the same as turning over the core sheet S _{1 in} that the positional relationship between one surface and the other surface of the core sheet S _{1 having} the same planar shape is reversed.

Furthermore, in this embodiment, each axial hole 14 provided in each of the first core 11a and the second core 11b is in the axial direction with the front and back relations of the opposing surfaces of the first core 11a and the second core 11b being the same. It arranges so that it may communicate with. If the second core 11b is positioned with respect to the first core 11a in this way, the hole 13 is always in a desired position, that is, the rotation direction about the axis O of the rotary shaft 1 with respect to the magnet hole 12. Alternatively, it can be disposed at a position relatively rotated by an angle θ _{1 in the} opposite direction.

  And the shaft part s of the fixing member F is inserted in each shaft hole 14 of the 1st core 11a and the 2nd core 11b arrange | positioned as mentioned above, and the predetermined fixing means provided in the both ends of the said shaft part s Thus, the first core 11a and the second core 11b are fixed in the axial direction. Further, the rotor core 11, in which the first core 11 a and the second core 11 b are fixed and integrated with each other by the fixing member F, is connected to the rotary shaft 1. Thus, the rotor 10 according to the first embodiment is manufactured.

According to the rotor 10 and the manufacturing method thereof of the present embodiment, in the rotor core 11 including the first core 11a in which the magnet 2 is embedded in the magnet hole 12 and the second core 11b for retaining the magnet 2, the first core 11a. Each core sheet which comprises the 1st core 11a and the 2nd core 11b by having comprised the number of the magnet holes 12 with which it is provided, the hole width, the number of the holes 13 with which the 2nd core 11b is provided, and the hole width being the same. S ₁ can be formed using the same mold. Thereby, the equipment cost and product cost which are required for the preparation of a dedicated mold can be reduced. In addition, the man-hour for switching the mold in the punching process of the core sheet S ₁ can be reduced, and at the same time, the control of the mold is extremely easy, so that the production efficiency of the product can be greatly improved.

Further, by forming the first core 11a and the second core 11b in the core sheet S ₁ of the same planar shape, for the punching process of the core sheet S ₁ it can be carried out unipotent manner, is possible to further improve the production efficiency it can. Moreover, when the magnet 2 is retained by the second core 11b made of the core sheet S _{1 having} the same planar shape, the hole 13 is displaced relative to the magnet hole 12 in the surface direction of the core sheet S _1. Therefore, magnetic flux leakage from the magnet 2 to the second core 11b is suppressed. Thereby, deterioration of the magnetic characteristics of the rotor 10 is effectively reduced, and the performance of the rotating electrical machine can be improved.

Further, the core sheet S ₁ constituting the first core 11a and the second core 11b, by arranging the respective axial hole portion H _A in a positional relationship as described above, the second core 11b with respect to the first cores 11a The relative positioning can be performed very easily and accurately. That is, each axis for inserting the shaft portion s of the fixing member F by laminating the front and back relations of one surface and the other surface of the core sheet S _{1 on} the opposing surfaces of the first core 11a and the second core 11b. Using the positioning of the holes 14, the holes 13 can be positioned with respect to the magnet holes 12. Accordingly, extremely accurate positioning can be reliably performed while substantially omitting the positioning of the hole 13 with respect to the magnet hole 12 which is most important in the present invention.

  As mentioned above, although embodiment of the rotor 10 which concerns on 1st embodiment of this invention, and its manufacturing method was described, the rotor which concerns on this invention, and its manufacturing method can be implemented with another form. In the following description, detailed description of the configuration common to the rotor 10 described above will be omitted as appropriate, and the technical features of each embodiment will be described in detail.

For example, an embodiment like the rotor 20 shown in FIG. 3 may be used. The rotor 20 according to the second embodiment is a modification of the rotor 10 according to the first embodiment described above, and can position the air holes 23 with respect to the magnet holes 22 by using the positioning of the shaft holes 24. The point is common to the rotor 10 described above. In the rotor 20 of the present embodiment, in the rotor core 21 constituted by the first core 21a and the second core 21b, the second core 21b is predetermined from the n magnetic pole pitch θ _P (n is an integer) with respect to the first core 21a. The layers are stacked so as to be shifted in the rotational direction or in the opposite direction by only the angle θ ₂ (that is, the angle corresponding to nθ _P ± θ ₂ ).

Here, the “magnetic pole pitch θ _P ” is an angle obtained by dividing the entire circumference 360 ° of the rotor core 21 by the number of poles of the magnetic pole P. In the present embodiment, the number of magnetic poles P is is the same six as the number of magnet holes 22, an angle corresponding to the pole pitch theta _P becomes 60 °. Further, “n magnetic pole pitch θ _P ” indicates an angle corresponding to an integral multiple of the magnetic pole pitch θ _P (60 ° × n in this embodiment).

  The first core 21a and the second core 21b have a substantially V-shaped magnet hole 22 and a hole 23 having a flux barrier provided at both ends, and a diameter dimension of the shaft part s of the fixing member F. Six shaft holes 24 each having an equivalent circular shape in plan view are provided. Each magnet hole 22 and each shaft hole 24 in the first core 21a and each hole 23 and each shaft hole 24 in the second core 21b are arranged in the same positional relationship. In other words, the first core 21a and the second core 21b of the present embodiment have the same configuration except for the respective stack thicknesses.

Each of the first core 21a and the second core 21b is composed of a core sheet S having the same planar shape as described above. Specifically, as shown in FIG. 4, respectively provided in a plurality predetermined position the magnet holes H _M and a shaft hole portion H _A is the inner periphery and the outer periphery of (six in this embodiment) extending in the axial direction An annular core sheet S ₂ is used.

In the core sheet S _2, each magnet hole H _M is at both ends are formed in a planar view substantially V-shape flux barrier is provided, an equal pitch, respectively in the circumferential direction (i.e., the magnetic pole pitch theta _P) Is provided. Further, the shortest distance in the radial direction of the center point of the core sheet S ₂ (corresponding to the axis O of the rotating shaft 1) to each magnet hole H _M is all equal. By each magnet hole H _M provided on the core sheet S ₂ is disposed communicates with the axial direction, the magnet holes 22 in the first core 21a, and the holes 23 in the second core 21b are formed.

On the other hand, in the core sheet S _2, the shaft hole portion H _A, first shaft hole provided at a position shifted by a predetermined angle theta _2/2 in the rotational direction or the reverse direction thereof from between the poles of the magnetic poles P circumferentially adjacent a Department H1 _a, first provided at a position deviated from the angle corresponding to an odd multiple of the pole pitch theta _P in the rotational direction or reverse direction thereof by a predetermined angle theta _2/2 relative to the first shaft hole portion H1 _a It is configured to include a 2 shaft hole portion H2 _a, a, which are arranged alternately in the circumferential direction. The first shaft hole portion H1 _A, the second shaft hole portion H2 _A respective center points are arranged on concentric circumference of the inner periphery and outer periphery of the core sheet S _2. By the axial hole portion H _A provided on the core sheet S ₂ is disposed communicates with the axial direction, the first core 21a and the second the shaft hole 24 in the core 21b (first shaft hole 24a, a second shaft hole 24b) is formed respectively.

In more detail, when the rotational direction of the rotor 20, assumed to be clockwise direction about the axis O of the rotating shaft 1, the core sheet S _2, the first shaft hole portion H1 _A is circumferential It is provided at a position shifted by a predetermined angle theta _2/2 in the rotation direction from between the poles of the magnetic poles P adjacent in direction. In contrast, the second shaft hole portion H2 _A, is provided at a position shifted by a predetermined angle theta _2/2 in a direction opposite to the rotating direction from between the poles of the magnetic poles P adjacent to each other in the circumferential direction. In the present embodiment, since the first shaft hole portion H1 _A and the second shaft hole portion H2 _A are arranged alternately in the circumferential direction, are adjacent in the direction of rotation side to one of the first shaft hole portion H1 _A the second shaft hole portion H2 _a, is disposed in a position shifted by the rotation direction angle corresponding to the pole pitch theta _P - [theta] ₂ with respect to the first shaft hole portion H1 _a. The second shaft hole portion H2 _A adjacent to each other in opposite rotational direction relative to the first shaft hole portion H1 _A corresponds to the pole pitch theta _P + theta ₂ with respect to the first shaft hole portion H1 _A It is arranged at a position shifted by an angle in the direction opposite to the rotation direction.

In the present embodiment, each first shaft hole H1 _A (first shaft hole 24a) in the second core 21b corresponds to each second shaft hole H2 _A (second shaft hole 24b) in the first core 21a. Are stacked. Such correspondence may be reversed. At this time, in the first core 21a and the second core 21b, the shaft holes 24 that are in a corresponding relationship with each other pass through in a circular shape in the axial direction with their outer circumferences completely overlapping. The fixing member F is attached through the shaft hole 24. On the other hand, the shaft holes 24 that are not in a corresponding relationship are partially formed with a portion penetrating in the axial direction, but cannot be inserted through the shaft portion s of the fixing member F. In the present embodiment, the corresponding shaft holes 24 and the non-corresponding shaft holes 24 are alternately arranged in the circumferential direction at three locations.

In the present embodiment, when stacking the second core 21b with respect to the first core 21a, corresponding to the second shaft hole portion H2 _A adjacent to each other in the rotational direction relative to each of the first shaft hole portion H1 _A In this case, the second core 21b is laminated with a relative shift in the rotation direction by an angle corresponding to θ _P −θ ₂ with respect to the first core 21a. Meanwhile, each when made to correspond to the second shaft hole portion H2 _A adjacent to each other in opposite rotational direction with respect to the first shaft hole portion H1 _A, theta _P with respect to the second core 21b is first core 21a The layers are stacked with a relative shift in the rotational direction by an angle corresponding to + θ ₂ . The arrangement of the first shaft hole portion H1 _A and the second shaft hole portion H2 _A in the core sheet S ₂ and which correspondence is selected so as to satisfy the positioning condition of the hole 23 with respect to the magnet hole 22. Is appropriately designed and selected. The conditions are the same as described above. In the present embodiment, if there are four or more poles, two or more fixing members F are provided, so that fixing is possible. Furthermore, if it is 6 poles or more, three or more fixing members F are provided, and can be fixed more stably.

  Next, a method for manufacturing the rotor 20 according to the present embodiment will be described. The rotor 20 of this embodiment can be manufactured by the same method as the rotor 10 described above by changing the fifth step in the method of manufacturing the rotor 10 described above as follows.

In the present embodiment, as the fifth step, the second core 21b is shifted from the n magnetic pole pitch θ _P (n is an integer) by a predetermined angle θ _{2 with} respect to the first core 21a (ie, nθ _P ± θ ₂ °). ) And rotating in the direction of rotation or vice versa. The second core 21b only needs to be disposed at a position relatively rotated with respect to the first core 21a. For example, the second core 21b may be stacked by rotating the first core 21a by a predetermined angle. . Also in this case, the positional relationship between the first core 21a and the second core 21b is the same as a result.

  Therefore, also in the rotor 20 of this embodiment and its manufacturing method, the effect similar to the rotor 10 mentioned above can be acquired. In addition, according to the rotor 20 and the manufacturing method thereof of the present embodiment, it is not necessary to match the front and back relations of the facing surfaces of the first core 21a and the second core 21b at the time of stacking. For this reason, a man-hour is further reduced and production efficiency can be raised more.

In the rotor according to the present invention, as described above, the second core is laminated with being shifted from the n magnetic pole pitch θ _P (n is an integer) by a predetermined angle in the rotational direction or the opposite direction with respect to the first core. Thus, the configuration of the rotor core capable of retaining the magnet 2 and the manufacturing method thereof are not limited to the present embodiment, and can be implemented in other forms.

  For example, an embodiment like the rotor 30 shown in FIG. 5 may be used. In the rotor 30 according to the third embodiment, in the rotor core 31 composed of the first core 31a and the second core 31b, the peripheral shape of each shaft hole 34 provided in the first core 31a and the second core 31b is substantially elliptical. It is formed in a shape.

Each of the first core 31a and the second core 31b is composed of a core sheet S having the same planar shape as described above. Specifically, as shown in FIG. 6, respectively provided in a plurality predetermined position the magnet holes H _M and a shaft hole portion H _A is the inner periphery and the outer periphery of (four in this embodiment) extending in the axial direction an annular core sheet S ₃ is used with.

In the core sheet S _3, the form of each magnet hole H _M (e.g., shape, size, arrangement, etc.) is the same as the core sheet S ₁ described above. By each magnet hole H _M provided on the core sheet S ₃ is disposed communicates with the axial direction, the magnet holes 32 in the first core 31a, and the holes 33 in the second core 31b are formed.

On the other hand, in the core sheet S ₃ , the shaft hole portion _HA is formed in a substantially elliptical peripheral shape. In the present embodiment, the center point of the shaft hole _HA (that is, the intersection of the long axis and the short axis) is between the poles of the magnetic poles P adjacent to each other on the inner circumference and the outer circumference of the core sheet S _{3 in} the circumferential direction. However, this center point may be arranged at the pole center of each magnetic pole P. Further, in the present embodiment, the shaft hole portion H _A, (in other words, as the minor axis is parallel to the radial direction of the core sheet S _3, the position of the center point of the long axis shaft hole portion H _A To be concentric tangent lines). Each shaft hole portion H _A provided on the core sheet S ₃ is by being arranged communicating axially, each shaft hole 34 of the first core 31a and the second core 31b are formed.

In the present embodiment, when the second core 31b is rotated relative to the first core 31a by a predetermined angle (in this embodiment, nθ _P ± θ ₃ °) in the rotational direction or the opposite direction, FIG. As shown in FIG. 3, a portion where the shaft hole 34 of the first core 31a and the shaft hole 34 of the second core 31b penetrate in the axial direction is formed in a circular shape in plan view. Therefore, the shaft portion s of the fixing member F can be inserted through the portion. The positional relationship between the first core 31 a and the second core 31 b arranged in this way is fixed by the fastening force of the fixing member F. At this time, the angle θ _{3 at which} the second core 31b substantially deviates from the first core 31a needs to be an angle within a range that satisfies the positioning condition of the hole 33 with respect to the magnet hole 32, as described above. Become. Incidentally, according to this embodiment, as long as the shifting of the core sheet S ₃ to be the second core 31b by an angle theta _3, since the the free core sheet S ₃ all magnet 2 is shifted by an angle theta _3, Sound due to the vertical movement of the magnet 2 can be prevented.

Or embodiment like the rotor 40 shown in FIG. 7 may be sufficient. The rotor 40 is a modification of the rotor 30 according to the third embodiment, and the first core 41a and the second core 41b constituting the rotor core 41 are both the same plane shape core sheet S ₄ (see FIG. 8). It is configured. Rotor 40 of the present embodiment, the core sheet S ₄ has a plurality of magnets holes H _M which penetrates in the axial direction, and caulking a plurality of protrusions B each core sheet S ₄ axially adjacent, this The plurality of through holes H _B having the same planar shape as the protrusion B are formed in an annular shape provided at predetermined positions on the inner periphery and the outer periphery, respectively. As shown in FIG. 8, in the present embodiment, four magnet holes H _M , protrusions B, and four through holes H _B are formed.

In the core sheet S _4, the form of each magnet hole H _M (e.g., shape, size, arrangement, etc.) is the same as the core sheet S ₁ described above. By each magnet hole H _M provided on the core sheet S ₄ is disposed communicates with the axial direction, the magnet holes 42 in the first core 41a, and the holes 43 in the second core 41b are formed.

On the other hand, in the core sheet S ₄ , the protruding portion B is formed in a rectangular shape in plan view, and the central portion protrudes at a predetermined height in the axial direction on one surface side of the core sheet S ₄ . In contrast, in the other side of the core sheet S ₄ are recessed central portion of the protrusion B. For this reason, the axial cross-sectional shape of the protrusion B is V-shaped. The height of the projections B is formed below the thickness of the core sheet S _4. In the present embodiment, the protrusions B are provided at a constant pitch in the inner periphery and concentric circumference of the outer periphery of the core sheet S _4. When forming the first core 41a and the second core 41b, position each core sheet S ₄ combined in the protrusions B are stacked in the axial direction. Accordingly, the protrusion B in one side of one core sheet S ₄ are stacked in a recess of the other surface side of the other core sheet S _4. Such a lamination technique is called V-protrusion caulking.

Further, in the core sheet S ₄ , the through hole H _B has a peripheral shape formed in a rectangular shape in plan view like the protrusion B, and penetrates in the axial direction. In the present embodiment, each through hole H _B is formed on the same circumference as each projection B and at a position shifted by a predetermined angle θ _{4 with} respect to each projection B in the rotational direction or the opposite direction. Yes. When the first core 41a and the second core 41b is formed, the through-holes H _B is placed in communication over the other end surface from the respective end face.

In the present embodiment, when the second core 41b is rotated relative to the first core 41a by a predetermined angle (in this embodiment, nθ _P ± θ ₄ °) in the rotational direction or the opposite direction, FIG. As shown in FIG. 4, on each facing surface of the first core 41a and the second core 41b, the phase of each protrusion B on the end surface of one core and the phase of each through hole H _B on the end surface of the other core Match. That is, when the 2nd core 41b is laminated | stacked on the one end surface of the 1st core 41a, each through-hole H on the phase of each projection part B on the one end surface of the 1st core 41a, and the other end surface of the 2nd core 41b. The phase of _B matches. On the other hand, if the second core 41b is laminated to the other end face of the first core 41a, each through-hole H _B on the other end surface of the first core 41a phases, the protrusions on one end surface of the second core 41b It matches the phase of B.

Therefore, when the 2nd core 41b is laminated | stacked on the 1st core 41a by such positional relationship, each protrusion part B provided in the end surface of one core among the 1st core 41a and the 2nd core 41b is the other. It is accommodated in each through hole H _B provided on the end face of the core and having the same phase. As a result, the two rotor core sheets that are in contact with each other are always fixed at four positions at intervals of 90 °. At this time, the angle θ _{4 at which} the second core 41b substantially deviates from the first core 41a needs to be an angle within a range that satisfies the positioning condition of the hole 43 with respect to the magnet hole 42, as described above. Become.

Further, in the rotor according to the embodiments described above, each magnet hole H _M provided in each core sheet constituting the first core and the second core, the peripheral shape, size, form of the arrangement and the like are all are formed in the same, in the rotor of the present invention, the peripheral shape of all of the magnet hole H _M provided on one core sheet, the size, the form of the arrangement and the like are not necessarily the same.

For example, a form like the rotor 50 shown in FIG. 9 may be sufficient. In the rotor 50 according to the fourth embodiment, in the rotor core 51 composed of the first core 51a and the second core 51b, the core sheet S constituting the first core 51a and the second core 51b has different magnet shapes. It comprises a section H _M, the second core 51b has shifted in the rotational direction or the reverse direction thereof an angle corresponding to the n pole pitch theta _P with respect to the first cores 51a.

  The first core 51a includes a plurality of (four in this embodiment) magnet holes 52 provided at an equal pitch in the circumferential direction. The magnet hole 52 includes a first magnet hole 52a and a second magnet hole 52b having different planar shapes. In the present embodiment, the first magnet holes 52a and the second magnet holes 52b are alternately arranged in the circumferential direction.

  The first magnet hole 52a is formed in a substantially concave shape in plan view in which flux barriers are provided at both ends, and a rectangular first notch 521 as a positioning means for the embedded magnet 2 is provided on the first core 51a. It is provided at a predetermined position on the inner peripheral side. The maximum hole width of the first magnet hole 52a and the longitudinal dimension of the first notch 521 can be appropriately changed so as to be equal to the thickness and width dimension of the magnet 2.

  The second magnet hole 52b has the same configuration as the first magnet hole 52a except for the following differences. The difference between the second magnet hole 52b and the first magnet hole 52a is as follows. That is, the second magnet hole 52b is a divided hole that is divided in the longitudinal direction by the partition wall 522 provided near the pole center of the magnetic pole P. Therefore, the magnet 2 is embedded in each of the divided holes. Further, the end portion of the second notch 523 provided in the second magnet hole 52b is positioned closer to the flux barrier than the end portion of the first notch 521 provided in the first magnet hole 52a.

  The second core 51b has the same configuration as the first core 51a except for the thickness. The second core 51b includes a first hole 53a and a second hole 53b as a configuration corresponding to the first magnet hole 52a and the second magnet hole 52b in the first core 51a described above. A first notch 531 is formed in the first hole 53a, and a partition wall 532 and a second notch 533 are formed in the second hole 53b.

Each of the first core 51a and the second core 51b is composed of a core sheet S having the same planar shape. Specifically, as shown in FIG. 10, a plurality of annular magnet holes H _M is respectively provided at a predetermined position on the inner periphery and the outer periphery of (four in this embodiment) core sheets extending in the axial direction S ₅ is used. In the present embodiment, as a magnet hole H _M, the first magnet hole H1 _M and the second magnet holes H2 _M is peripheral shape different from each other, they are arranged alternately at a constant pitch in the circumferential direction. The first magnet hole H1 _M is formed with a first notch C1, and the second magnet hole H2 _M is formed with a partition wall D and a second notch C2.

In the core sheet S ₅ , the first magnet hole 52 a and the second magnet described above with respect to the peripheral shape (planar shape), size, arrangement, and the like of the first magnet hole H 1 _M and the second magnet hole H 2 _M. Since it is common with the hole 52b, description is abbreviate | omitted here. By first magnet hole H1 _M and the second magnet holes H2 _M provided on the core sheet S ₅ is disposed communicates with the axial direction, comprises a first magnet hole 52a (the notch 521 in the first core 51a ) And second magnet hole 52b (including partition 522 and notch 523) are formed. The same applies to the first hole 53a and the second hole 53b in the second core 51b.

In the present embodiment, each first magnet hole H1 _M (first hole 53a) in the second core 51b corresponds to each second magnet hole H2 _M (second magnet hole 52b) in the first core 51a. Are stacked. At this time, the second core 51b is embedded in the second magnet hole 52b by a portion located near the periphery of the first hole 53a and outside the both end portions of the first notch 521 (closer to the flux barrier). The vicinity of the corner of the magnet 2 is partially covered.

Similarly, each second magnet hole H2 _M (second hole 53b) in the second core 51b is laminated corresponding to each first magnet hole H1 _M (first magnet hole 52a) in the first core 51a. Has been. At this time, the central portion of the magnet 2 embedded in the first magnet hole 52a is partially covered by the partition wall 522 that forms a part of the second core 51b, in the vicinity of the periphery of the second hole 53b.

In the present embodiment, the first magnet holes 52a and the second magnet holes 52b (the first holes 53a and the second holes 53b) are alternately arranged at equal pitches in the circumferential direction. In addition, in order to arrange each hole 53 in the above-described correspondence, the second core 51b is rotated in the rotational direction by an angle corresponding to an odd multiple of the magnetic pole pitch θ _P with respect to the first core 51a or in the opposite direction. It suffices if they are stacked at a position relatively shifted from each other. The caulking means between the core sheets can be realized by a known means, and will be omitted.

In the present embodiment, the first magnet hole 52a and the second magnet hole 52b (the first hole 53a and the second hole 53b) may be continuously arranged in the circumferential direction. That is, the arrangement may be such that one of the magnet holes 52 and the holes 53 adjacent in the circumferential direction has the same peripheral shape and the other has a different peripheral shape. In such a case, in order to arrange each magnet hole 52 and each hole 53 in the above-described correspondence relationship, the second core 51b has an angle corresponding to an even multiple of the magnetic pole pitch θ _P with respect to the first core 51a. Therefore, they are stacked at positions relatively displaced in the rotational direction or the opposite direction.

  Next, a method for manufacturing the rotor 50 according to this embodiment will be described. The rotor 50 of this embodiment can also be manufactured by the same method as the rotor 10 described above by changing the second step and the fifth step in the method for manufacturing the rotor 10 described above as follows. .

In the present embodiment, as the second step, the core sheet S ₅ described above will be punched. In this step, a plurality of magnet hole portions H _M (first magnet hole portion H1 _M and second magnet hole portion H2 _M ) having different peripheral shapes are respectively formed at predetermined positions on the core sheet S ₅ . The first magnet hole H1 _M and the second magnet hole H2 _M can be simultaneously formed by a single punch using each dedicated mold.

Alternatively, it partially corresponds to each component of the first magnet hole H1 _M and the second magnet hole H2 _M (that is, the flux barrier, the first notch C1, the second notch C2, and the partition wall D). A plurality of molds may be used, and each of these components may be formed by being punched in stages. In this case, the first magnet hole portion H1 _M not having the partition wall portion D is formed by punching the electromagnetic steel sheet with a mold corresponding to the partition wall portion D. On the other hand, by not punched electromagnetic steel plates in the mold corresponding to the partition wall portion D, the partition wall portion D of the second magnet hole H2 _M is formed.

Further, as the fifth step, the second core 51b is rotated by an angle corresponding to the n magnetic pole pitch θ _P (n is an integer) with respect to the first core 51a (ie, n × θ _P °) or in the opposite direction. Rotate to stack. In the present embodiment, since the first magnet hole portions H1 _M and the second magnet hole portions H2 _M are alternately arranged at an equal pitch in the circumferential direction, the rotation direction or the angle corresponding to an odd multiple of the magnetic pole pitch θ _P Laminate by rotating in the opposite direction.

Incidentally, in the core sheet S _5, the first magnet hole H1 _M and the second magnet holes H2 _M may be arranged continuously in the circumferential direction. In this case, lamination is performed by rotating in the rotation direction or the opposite direction by an angle corresponding to an even multiple of the magnetic pole pitch θ _P. Alternatively, the second core 51b may be stacked upside down with respect to the first core 51a.

That is, the important point in the fifth step of the present embodiment is that each first magnet hole H1 _M (first hole 53a) in the second core 51b is replaced with each second magnet hole H2 _M in the first core 51a. Each second magnet hole H2 _M (second hole 53b) in the second core 51b is formed in each (second magnet hole 52b), and each first magnet hole H1 _M (first magnet hole 52a in the first core 51a is formed. ), Respectively.

  Therefore, also in the rotor 50 of this embodiment and its manufacturing method, the effect similar to the rotor 10 mentioned above can be acquired. In addition, according to the rotor 50 and the manufacturing method thereof of the present embodiment, the relative relationship between the first core 51a and the second core 51b is obtained using the positional relationship between two types of magnet holes 52 having different planar shapes. Positioning can be performed.

Specifically, at the time of punching of the core sheet S ₅ constituting the first core 51a and the second core 51b, there is no need to provide a protrusion B for shaft hole portion H _A or caulking as described above as a positioning means. Even when providing these as fixing means of the first core 51a and the second core 51b, it is not necessary to consider the deviation of between the poles P adjacent to the center of a pole P _C or circumferential direction of the pole P poles, The punching position of the mold with respect to the electromagnetic steel sheet can be determined very easily.

Further, even when the lamination of the second core 51b with respect to the first cores 51a, can be positioned at an angle corresponding to an integral multiple of the pole pitch theta _P. For this reason, it is possible to greatly simplify the operation setting of a manufacturing apparatus (for example, a mold or the like in the second process) used in each process, and it is possible to effectively prevent the occurrence of malfunction.

The first magnet hole H1 _M and the second magnet hole H2 _M capable of obtaining the same effects as the rotor 50 and the manufacturing method thereof according to the present embodiment are the above-described forms (peripheral shape, arrangement, etc.). However, the present invention is not limited to this, and can be implemented in other forms.

For example, a form like the rotor 60 shown in FIG. 11 may be sufficient. The rotor 60 is a first modification of the rotor 50 described above, and the first core 61a and the second core 61b that constitute the rotor core 61 are configured by a core sheet S ₆ having the same planar shape (see FIG. 12). In the rotor 60 of the present embodiment, the core sheet S ₆ has the same hole width, and the magnet holes H _M (the first magnet hole H 1 _M and the first magnet hole H 1 _M and the distance from the outer periphery of the core sheet S ₆ are different from each other). A plurality of (second magnet holes H2 _M ) (four in this embodiment) are provided. The "distance from the outer periphery of the core sheet S _6" refers to the radial distance to each magnet hole H _M from the center of a pole P _C of each pole P.

As shown in FIG. 12, the core sheet S _6, the first magnet hole H1 _M and the second magnet holes H2 _M is the flux barrier is formed in plan view substantially recessed provided at both ends, embedded rectangular notch C as a positioning means of the magnet 2 to be is provided at a predetermined position on the inner circumference side of the core sheet S _6. The maximum hole width of each of the first magnet hole portion H1 _M and the second magnet hole portion H2 _M and the longitudinal dimension of the notch portion C are the same, and these are appropriately designed so as to be equal to the thickness and width dimension of the magnet 2. It can be changed.

In the core sheet S _6, the first magnet hole H1 _M and the second magnet holes H2 _M has the following differences. That is, the first magnet hole H1 _M, the core distance from the outer periphery of the sheet S ₆ to that is d _1, the second magnet holes H2 _M, the distance d ₂ from the outer periphery of the core sheet S ₆ It is. Therefore, in the first magnet hole H1 _M and the second magnet holes H2 _M, the length of the flux barrier provided at both ends are different from each other.

As shown in FIG. 11, in the present embodiment, each first magnet hole H1 _M (first hole 63a) in the second core 61b is replaced with each second magnet hole H2 _M (second in the first core 61a). The magnet holes 62b) are laminated correspondingly. At this time, the second core 61b is embedded in the second magnet hole 62b by a portion located near the periphery of the first hole 63a and located on the outer side (outer peripheral side) in the radial direction than the first hole 63a. A part of the magnet 2 (the side of the magnetic pole surface located outside in the radial direction) is partially covered.

Similarly, each second magnet hole H2 _M (second hole 63b) in the second core 61b is laminated corresponding to each first magnet hole H1 _M (first magnet hole 62a) in the first core 61a. Has been. At this time, each of the first core holes 62a has a portion located near the periphery of the second hole 63b in the second core 61b and located on the inner side (inner peripheral side) in the radial direction than the second hole 63b. A part of the embedded magnet 2 (the magnetic pole surface side located radially inside) is partially covered. Specifically, the difference between d ₁ and d ₂ is less than the thickness of the magnet 2, desirably 1/2 or less of the thickness of the magnet 2. Further, the difference between d ₁ and d ₂ needs to exceed the difference (clearance) between the magnet hole and the magnet thickness.

In the present embodiment, the first magnet hole portion H1 _M and the second magnet hole portion H2 _M may be formed in a reverse arc shape at the peripheral edge. For example, a form like the rotor 70 shown in FIG. 13 may be sufficient. The rotor 70 is a second modification of the rotor 50 described above, and the first core 71a and the second core 71b constituting the rotor core 71 are configured by a core sheet S ₇ (see FIG. 14) having the same planar shape. In the rotor 70 of the present embodiment, the core sheet S ₇ has magnet holes H _M (first magnet hole H 1 _M and second magnet hole H 2 _M ) composed of a plurality of concentric reverse arc-shaped through hole groups. A plurality of (in this embodiment, four magnetic poles P) are provided.

In the present embodiment, it constitutes a concentric opposite arc-shaped through-holes are 2 Konami設radially one magnet hole H _M In these pair per one pole P. Therefore, as shown in FIG. 14, in the core sheet S ₇ , the first magnet hole H1 _M and the second magnet hole H2 _M are a set of two concentric inverted arcs each having a predetermined hole width. It is configured by arranging the holes at predetermined intervals in the radial direction. In the first magnet hole H1 _M and the second magnet hole H2 _M , the center points of the arcs constituting the outer periphery and inner periphery of each through hole are the center point O of the core sheet S ₇ and the pole center P _{C of the} magnetic pole P. The distances from the center point O to the center point of each arc are all equal.

In the core sheet S ₇ , the first magnet hole H1 _M and the second magnet hole H2 _M have the following differences. That is, the first magnet hole H1 _M, the distance from the outer periphery of the core sheet S ₇ to the through-hole distance to the through hole located on the outer peripheral side of the core sheet S ₇ is d _3, located on the inner peripheral side while a d _5, the second magnet holes H2 _M, the outer periphery the core sheet S distance to the through hole located on the outer peripheral side of ₇ d ₄ from the core sheet S _7, located on the inner peripheral side distance to the through-hole is d _6. In the present embodiment, d ₃ ≠ d ₄ and d ₅ ≠ d ₆ , and d ₃ > d ₄ and d ₅ > d ₆ are satisfied. d ₃ is slightly longer than d ₄ . The same applies to d ₅ and d ₆ . Therefore, in the first magnet hole H1 _M and the second magnet holes H2 _M, the circumferential length of the through holes constituting these are different. Specifically, the difference between d ₃ and d ₄ and the difference between d ₅ and d ₆ are less than the thickness of the magnet 2, preferably 1/2 or less of the thickness of the magnet 2. Further, the difference between d ₃ and d ₄ and the difference between d ₅ and d ₆ need to exceed the difference (clearance) between the magnet hole and the magnet thickness.

In this embodiment, each through-hole located on the outer peripheral side of the core sheet S _7, and the through holes located on the inner peripheral side, may be formed at different pore width. In other words, in the relationship of the first magnet hole H1 _M and the second magnet holes H2 _M, the through hole with each other is located in the through-hole and between the inner periphery positioned on the outer peripheral side of the core sheet S ₇ are each identical holes As long as it is formed in width, each magnet hole 72 (first magnet hole 72a and second magnet hole 72b) and each hole 73 (first hole 73a and second hole 73b) in the rotor core 71 of the present embodiment. Is the same as the positional relationship between each magnet hole 62 and each hole 63 in the rotor core 61 described above.

Further, as described above, when the peripheral shape of the first magnet hole H1 _M and the second magnet hole H2 _M provided in the core sheet S constituting the first core and the second core is a reverse arc shape, These may be formed with different curvatures.

For example, a form like the rotor 80 shown in FIG. 15 may be sufficient. The rotor 80 is a third modification of the rotor 50 described above, and the first core 81a and the second core 81b that constitute the rotor core 81 are configured by a core sheet S ₈ (see FIG. 16) having the same planar shape. The rotor 80 of this embodiment, the core sheet S ₈ is, curvatures of different opposite arcuate magnet hole H _M (first magnet hole H1 _M and the second magnet holes H2 _M) a plurality (in this embodiment 4).

As shown in FIG. 16, formed in the core sheet S _8, the first magnet hole H1 _M and the second magnet holes H2 _M have the same pore width, conversely arcuate with different respective curvatures Has been. In the present embodiment, the smaller curvature the first magnet hole H1 _M, the direction of curvature as large as the second magnet holes H2 _M. Moreover, although the 1st magnet hole part H1 _M and the 2nd magnet hole part H2 _M are alternately arrange | positioned in the circumferential direction, you may arrange | position continuously in the circumferential direction. Even in the case of using such a core sheet S _8, similarly to the rotor 60, 70 described above, it is possible to perform retainer magnet 2 by a portion of the second core 81b.

  Furthermore, the present embodiment is characterized in that the first core 81a and the second core 81b are used for both the core for embedding the magnet 2 and the core for retaining the magnet 2. For this reason, in this embodiment, according to the position in the axial direction of the rotor core 81, the magnet hole 82 of the first core 81a is configured as a hole, and the hole 83 of the second core 81b is configured as a magnet hole.

  As shown in FIG. 15 (b), the rotor core 81 of the present embodiment has a first core 81 a disposed on one end side in the axial direction and a second core 81 b disposed on the other end side. It functions as a core to stop. Therefore, the magnet hole 82 (the first magnet hole 82a and the second magnet hole 82b) of the first core 81a disposed on one end side in the axial direction constitutes a hole. On the other hand, the first core 81 a and the second core 81 b arranged in the intermediate portion in the axial direction of the rotor core 81 function as a core in which the magnet 2 is embedded. Therefore, the air holes 83 (the first air holes 83a and the second air holes 83b) of the second core 81b arranged in the intermediate portion in the axial direction constitute magnet holes.

  In the present embodiment, the first core 81a and the second core 81b are alternately arranged in the axial direction. Thereby, the correspondence relationship between the magnet hole or hole provided in the core disposed at one end or both ends in the axial direction with respect to one core and the hole or magnet hole provided in the one core is described above. Thus, the first core 81a and the second core 81b can be used for both the core for embedding the magnet 2 and the core for retaining the magnet 2.

  In addition to this, in the rotor 80 of the present embodiment, portions in which the distance from the outer periphery of the rotor core 81 to each magnet 2 is different in the axial direction are formed in the same magnetic pole P. As a result, the step skew effect can be obtained, so that the cogging torque can be effectively reduced.

Or the form like the rotor 90 shown in FIG. 17 may be sufficient. The rotor 90 is a fourth modification of the rotor 50 described above, and the first core 91a and the second core 91b constituting the rotor core 91 are configured by a core sheet S ₉ (see FIG. 18) having the same planar shape. In the rotor 90 of the present embodiment, the core sheet S ₉ has the same hole width, and the magnet holes H _M (the first magnet hole H 1 _M and the second magnet) are provided at unequal pitches in the circumferential direction. the hole portion H2 _M) a plurality (in this embodiment four) are provided.

As shown in FIG. 18, in the core sheet S ₉ , the first magnet hole H1 _M and the second magnet hole H2 _M are formed in a substantially concave shape in a plan view in which flux barriers are provided at both ends. Are alternately arranged in the circumferential direction. The first magnet hole H1 _M and the second magnet hole H2 _M are formed to have the same peripheral shape and dimensions.

In the present embodiment, the distance between the other of the magnet hole H _M adjacent to the one magnet hole H _M circumferential direction is different in one end and the other end. Specifically, assuming that the rotation direction of the rotor 90 is a clockwise direction around the axis O of the rotation shaft 1, the first magnet hole H1 _M provided on the rotation direction side (one end side). The distance from the flux barrier to the flux barrier of the second magnet hole H2 _M provided on the opposite side (the other end side) from the rotation direction is d ₇ , whereas the distance from the rotation direction (others) the first magnet hole H1 _M of flux barriers provided on the end side), the distance to the flux barrier of the second magnet holes H2 _M provided on the rotational direction side (one end side) is d _8. In this embodiment, d ₇ ≠ d ₈ and d ₇ > d ₈ . d ₇ is slightly longer than d ₈ .

In the present embodiment, the first magnet hole H1 _M and the second magnet hole H2 _M are arranged in a rhombus shape. In other words, a straight line parallel to the longitudinal direction of the first magnet hole H1 _M, an angle of a line parallel to the longitudinal direction of the second magnet holes H2 _M is an obtuse angle at one end of the first magnet hole H1 _M There is an acute angle at the other end. In other words, the first magnet hole H1 _M and the second magnet holes H2 _M, compared straight line extending radially towards the inter-pole P adjacent from the central point O of the core sheet S ₉ circumferentially pole Is inclined at an angle corresponding to 45 ° ± θ ₉ .

Even in the case of using such a core sheet S _9, the second magnet hole 92b of the first air holes 93a provided in the second core 91b provided in the first core 91a, provided on the second core 91b By stacking the second holes 93b in correspondence with the first magnet holes 92a provided in the first core 91a, the magnet 2 can be prevented from being removed by the second core 91b. In the present embodiment, one of the magnets 2 embedded in each magnet hole 92 is a part of the second core 91b in the vicinity of the periphery of each hole 93 and outside or inside in the radial direction from each hole 93. Part is partially covered.

Or the form like the rotor 100 shown in FIG. 19 may be sufficient. The rotor 100 is a fifth modification of the rotor 50 described above, and the first core 101a and the second core 101b that constitute the rotor core 101 are configured by a core sheet S ₁₀ (see FIG. 20) having the same planar shape. In the rotor 100 of the present embodiment, the core sheet S ₁₀ has the same hole width, and the positions of the rectangular notches C provided as positioning means for the magnet 2 are different from each other in the longitudinal direction. A plurality (four in this embodiment) of H _M (first magnet hole H1 _M and second magnet hole H2 _M ) are provided.

As shown in FIG. 20, with the core sheet S _10, the first magnet hole H1 _M and the second magnet holes H2 _M, except for the position of the notch portion C in the longitudinal direction, the same configuration. That is, the first magnet hole portion H1 _M and the second magnet hole portion H2 _M of the present embodiment are formed in a substantially concave shape in plan view in which a flux barrier is provided at both ends, and the maximum hole width and the notch portion C are formed. Are formed to have the same longitudinal dimension.

In a first magnet hole H1 _M and the second magnet holes H2 _M, notch C is provided on the inner peripheral side of the core sheet S ₁₀ either. In the present embodiment, the distance to the flux barriers are different in one end and the other end of each magnet hole H _M from the end of the cutout portion C. Specifically, assuming that the rotation direction of the rotor 100 is a clockwise direction around the axis O of the rotation shaft 1, the cutout portion C is located on the rotation direction side in the first magnet hole portion H1 _M. to, and is formed at a position shifted to the side opposite to the rotational direction in the second magnet holes H2 _M.

In this embodiment, since the first magnet hole H1 _M and the second magnet holes H2 _M is constituted as described above, each magnet hole 102 provided in the first core 101a (first magnet hole 102a and the Similarly to the notch 1021, the magnet 2 embedded in the two magnet holes 102b) is also arranged at a position shifted to the rotational direction side or the opposite side to the rotational direction.

Even in the case of using such a core sheet S _10, the second magnet hole 102b of the first holes 103a provided in the second core 101b provided in the first core 101a, provided in the second core 101b By stacking the second holes 103b so as to correspond to the first magnet holes 102a provided in the first core 101a, it is possible to prevent the magnet 2 from being removed by the second core 101b. In the present embodiment, the second core 101b is located in the vicinity of the peripheral edge of each hole 103 and outside the both ends of the notch 1031 (on the side closer to the flux barrier) on the side where the distance to the flux barrier is longer. In this case, the vicinity of the corners of the magnet 2 embedded in each magnet hole 102 is partially covered.

Note that, as described above, the second core is laminated while being shifted relative to the first core in the rotational direction or the opposite direction by an angle corresponding to the n magnetic pole pitch θ _P , thereby preventing the magnet 2 from being removed. As long as the magnet hole and the hole corresponding to each other have different planar shapes and the magnet 2 can be partially covered with a part of the second core in the vicinity of the peripheral edge of the hole, The combinations of the forms (for example, planar shape and arrangement) are arbitrary. That is, in each core sheet S constituting the first core and the second core, the peripheral shapes of the first magnet hole portion H1 _M and the second magnet hole portion H2 _M , and their positional relationships can be combined in various forms. Since it exists, it is possible to select and change the design as appropriate.

For example, a form like the rotor 110 shown in FIG. 21 may be sufficient. The rotor 110 is a sixth modification of the rotor 50 described above, and the first core 111a and the second core 111b constituting the rotor core 111 are configured by a core sheet S ₁₁ having the same planar shape (see FIG. 22). The rotor 110 of this embodiment is the same as the core sheet S _11, the first magnet hole H1 _M plane approximately V-shape flux barrier is provided at both ends, plan view flux barrier is provided at both ends A plurality of substantially concave second magnet hole portions H2 _M (two in total in the present embodiment, a total of four) are provided, and these are alternately arranged at equal pitches in the circumferential direction.

In the present embodiment, a magnet 2a having a width dimension Wa and a magnet 2b having a width dimension Wb are embedded in the first magnet hole 112a. On the other hand, a magnet 2c having a width dimension Wc is embedded in the second magnet hole 112b. Therefore, as shown in FIG. 22, the core sheet S ₁₁ of the present embodiment, each magnet 2a, 2b, the width Wa of 2c, Wb, in accordance with the Wc, the first magnet hole H1 _M and the second magnet the dimensions of the hole H2 _M each peripheral shape is designed. In the present embodiment, the width dimension Wa of the magnet 2a and the width dimension Wb of the magnet 2b are the same (that is, Wa = Wb), but they may be different from each other.

Even in the case of using such a core sheet S _11, the second magnet hole 112b of the first holes 113a provided in the second core 111b provided in the first core 111a, provided in the second core 111b By stacking the second air holes 113b so as to correspond to the first magnet holes 112a provided in the first core 111a, respectively, the magnets 2a, 2b, 2c are formed by the second core 111b in the same manner as the rotor 60 described above. Can be removed.

  In the present embodiment, the configuration is such that the sum of the width dimension Wa of the magnet 2a and the width dimension Wb of the magnet 2b is equal to the width dimension Wc of the magnet 2c (that is, the relationship of Wa + Wb = Wc is established). It is desirable to do. With this configuration, the total area of the magnetic pole surfaces of the magnets 2a and 2b embedded in the first magnet hole 112a is equal to the area of the magnetic pole surface of the magnet 2c embedded in the second magnet hole 112b. Thereby, the magnetomotive forces of the magnetic poles P having different polarities (N pole and S pole) are equalized, and it is possible to prevent the magnetic force in each magnetic pole P from being unbalanced.

In addition, the rotors 60 to 110 according to the above-described embodiments can be manufactured by the same method as the rotor 50. In this case, punching is performed by changing the mold used in the second step, the mold having a shape corresponding to the core sheet S ₆ to S _11.

Further, in the rotor according to the present invention, each magnet hole H _M provided in each core sheet constituting the first core and the second core, the peripheral shape, size, form of arrangement or the like there in all the same However, one magnet hole _HM itself does not necessarily have a peripheral shape having symmetry.

For example, a form like the rotor 120 shown in FIG. 23 may be sufficient. In the rotor 120 according to the fifth embodiment, in the rotor core 121 composed of the first core 121a and the second core 121b, the core sheet S constituting the first core 121a and the second core 121b has the same peripheral shape. together, and a plurality of magnets holes H _M is asymmetric with respect to a straight line passing through the axis O of the rotating shaft 1 and the pole center P _C of the magnetic poles P. The magnet hole 122 in the first core 121a and the hole 123 in the second core 121b are arranged symmetrically with respect to the straight line.

Both the first core 121a and the second core 121b are composed of a core sheet S having the same planar shape. Specifically, as shown in FIG. 24, a plurality of annular magnet holes H _M is respectively provided at a predetermined position on the inner periphery and the outer periphery of (four in this embodiment) core sheets extending in the axial direction S ₁₂ is used. In the core sheet S _12, each magnet hole H _M is formed in plan view substantially recessed flux barriers are provided at both ends, are each provided at a constant pitch in the circumferential direction. Further, in this embodiment, a straight line parallel to the longitudinal direction of each magnet hole H _M, the extending angle of a straight line parallel to the direction of flux barriers, different in one end and the other end.

In this embodiment, flux barriers provided in each magnet hole H _M is the core sheet S parallel to the straight line extending in the radial direction toward between the center point O of ₁₂ magnetic poles P circumferentially adjacent poles It extends to. Thus, a straight line parallel to the longitudinal direction of the magnet hole H _M, the extending direction angle of a straight line parallel to the flux barrier, assuming the same at one end and the other end, the angle is 45 ° become. In this case, the peripheral shape of the magnet hole H _M is, for example, equal to the peripheral shape of each magnet hole H _M provided on the core sheet S ₁ described above.

However, in the present embodiment, the angle described above, since the different in the longitudinal direction of the one end and the other end of the magnet hole H _M, and the straight line parallel to the longitudinal direction of the magnet hole H _M, extending the flux barrier An angle formed by a straight line parallel to the direction is an angle corresponding to 45 ° + θ ₁₂ on one end side and an angle corresponding to 45 ° −θ ₁₂ on the other end side. In other words, long holes H _L which constitutes a part of the magnet hole H _M provided on the core sheet S ₁₂ is the elongated hole portion of the magnet hole H _M provided on the core sheet S ₁ described above It is inclined by an angle θ _{12 with} respect to the portion corresponding to _HL . For this reason, in this embodiment, the edge part E is formed in the connection part of the end of the long hole part _HL , and a flux barrier.

Further, in the present embodiment, in all of the magnet hole H _M, the edge portion E is disposed in one longitudinal end of each magnet hole H _M. That is, the rotational direction of the rotor 120, assuming the clockwise direction about the axis O of the rotating shaft 1, in all of the magnet hole H _M, the edge portion E is positioned in the rotational direction In other words. Therefore, in the core sheet S ₁₂ of the present embodiment, long holes H _L constituting each magnet hole H _M are arranged in a square shape.

In the present embodiment, similarly to the rotor 10 described above, the rotor core 121 is configured such that the opposing surfaces of the first core 121a and the second core 121b face each other (in other words, the first core 121a as one surface and between other surfaces of the core sheet S ₁₂ are opposed to each other in and respective end faces the second core 121b), and is formed by laminating the second core 121b on both end faces of the first core 121a . Thus, the magnet hole 122 in the first core 121a and the hole 123 in the second core 121b are in a line-symmetric relationship with respect to a straight line passing through the pole center P _C of the magnetic pole P and the axis O of the rotating shaft 1. .

  At this time, the edge 1231 in each hole 123 of the 2nd core 121b is arrange | positioned on the opposite side to the edge 1221 in each magnet hole 122 of the 1st core 121a. For this reason, in the present embodiment, a part of the magnet 2 embedded in the magnet hole 122 (positioned on the radially inner side) is located near the periphery of the hole 123 and in the vicinity of the edge 1231 of the second core 121b. The portion of the magnet hole 122 opposite to the edge 1221) is partially covered.

  On the other hand, the edge 1221 in each magnet hole 122 of the first core 121a is disposed on the opposite side to the edge 1231 in each hole 123 of the second core 121b. For this reason, in the present embodiment, a part of the magnet 2 embedded in the magnet hole 122 by a portion located on the outer side in the radial direction from the hole 123 of the second core 121b and opposite to the edge 1231. (A part on the magnetic pole face side located on the radially outer side and on the edge 1221 side in the magnet hole 122) is partially covered.

Thus, even in the case of using the core sheet S ₁₁ described above, the second core 121b, by laminating in a positional relationship as described above with respect to the first core 121a, the by the second core 121b The magnet 2 embedded in the magnet hole 122 can be retained.

Note that the rotor 120 according to the present embodiment can be manufactured by the same method as the rotor 10 described above. In this case, the mold used in the second step, punching is performed by changing the mold shape corresponding to the core sheet S _12.

In the fifth step, the positioning is substantially completed by simply turning the second core 121b over the first core 121a and stacking them. In the present embodiment, the magnet hole 122 and the hole 123 correspond to the pole center P _C of the magnetic pole P and the axis of the rotary shaft 1 regardless of the combination of the magnet hole 122 and the hole 123. This is because they are arranged symmetrically with respect to a straight line passing through O. Therefore, in the present embodiment, the relative positioning of the second core 121b in the circumferential direction with respect to the first core 121a can be substantially omitted.

  Or the form like the rotor 130 shown in FIG. 25 may be sufficient. The rotor 130 is a modification of the rotor 120 described above, and is an example of an embodiment in which the rotor 120 and the rotor 100 shown in FIG. 19 are combined. That is, in the rotor 130, each magnet hole 132 provided in the first core 131a and each hole 133 provided in the second core 131b are the second magnet hole 102b and the second hole 103b in the rotor 100. And the same plane shape.

Specifically, as shown in FIG. 26, each magnet hole H _M provided on the core sheet S ₁₃ is notch C on the inner peripheral side is provided in the core sheet S _13,-out the cut-out distance from the end parts C to flux barriers are different in one end and the other end of the magnet hole H _M. That is, the rotation direction of the rotor 130, assuming the clockwise direction about the axis O of the rotating shaft 1, the cutout portion C, opposite to the rotational direction in the longitudinal direction of the magnet hole H _M It is formed in the position shifted to. Thus, each magnet hole H _M provided on the core sheet S _13, as with each magnet hole H _M provided on the core sheet S ₁₂ described above, the pole P pole center P _C and the rotary shaft 1 Asymmetric with respect to a straight line passing through the axis O.

In the rotor 130 of this embodiment, the notches 1321 in the magnet holes 132 and the notches 1331 in the air holes 133 are arranged in the same positional relationship as the edges 1221 and 1231 in the rotor 120. Specifically, in all of the magnet hole H _M provided on the core sheet S _13, notches C at a position offset in the longitudinal direction of the one end side of each magnet hole H _M is disposed. That is, the rotation direction of the rotor 130, assuming the clockwise direction about the axis O of the rotating shaft 1, notch C in all of the magnet hole H _M, opposite to the rotating direction It is arranged at a position shifted to.

  In the present embodiment, the magnet 2 embedded in the magnet hole 132 is positioned by the notch 1321. Therefore, the embedding position of the magnet 2 in the longitudinal direction of the magnet hole 132 is also shifted to the opposite side to the rotation direction. For this reason, a part of the second core 131b located in the vicinity of the periphery of the air hole 133 and outside the both ends of the notch 1331 (on the side closer to the flux barrier) on the side where the distance to the flux barrier is longer. Thus, the vicinity of the corner of the magnet 2 embedded in each magnet hole 132 is partially covered.

For the manufacturing method of the rotor 130 of this embodiment, the mold used in the second step, except that punching is performed by changing the mold shape corresponding to the core sheet S _13, the above-mentioned rotor 10 and 120, and can be produced by the same method.

  In the rotors 10 to 130 according to each of the above-described embodiments, the first core and the second core that constitute the rotor core are both configured by the core sheet S having the same planar shape. The core sheet S constituting the second core and the core sheet S constituting the second core do not necessarily have the same planar shape as long as the number of magnet holes and holes and the hole width are the same.

  For example, a form like the rotor 140 shown in FIG. 27 may be sufficient. In the rotor 140 according to the sixth embodiment, the first core 141a and the second core 141b constituting the rotor core 141 are configured by core sheets S (see FIGS. 28 and 29) having different shapes, and the first core The planar shapes of 141a and the second core 141b are different from each other only in the planar shapes of the magnet holes 142 and 143.

  The first core 141a includes a plurality of (general) V-shaped magnet holes 142 each having a substantially V-shape in plan view, each including a V-shaped hole 142v in which the magnet 2 is embedded and a flux barrier 142f provided at both ends of the V-shaped hole 142v. 6 in the embodiment), and these are arranged at an equal pitch in the circumferential direction. The planar shape and arrangement of the magnet holes 142 are the same as those of the magnet holes 21 provided in the first core 21a constituting a part of the rotor core 21 of the rotor 20 described above. Therefore, the 1st core 141a is the same plane shape as the above-mentioned 1st core 21a except arrangement | positioning of the shaft hole 144 mentioned later.

  The second core 141b is a plan view including a V-shaped hole 143v having the same planar shape as the V-shaped hole 142v constituting a part of the magnet hole 142, and a flux barrier 143f provided at both ends of the V-shaped hole 143v. A plurality (six in this embodiment) of substantially V-shaped holes 143 are provided, and these holes are arranged at an equal pitch in the circumferential direction. Although the air hole 143 and the magnet hole 142 of the present embodiment have the same hole width, the planar shape as a whole is different from each other in the following points. Therefore, the second core 141b has a different planar shape from the first core 141a.

In this embodiment, the positional relationship between the V-shaped hole 143v and the flux barrier 143f in the hole 143 and the positional relationship between the V-shaped hole 142v and the flux barrier 142f in the magnet hole 142 are different from each other. Specifically, when comparing the magnet holes 142 as a reference, the holes 143 of the present embodiment, only the V-shaped hole 143v is formed at a position shifted in the circumferential direction small angle theta _14, respectively. That is, assuming that the rotation direction of the rotor 140 is a clockwise direction centering on the axis O of the rotation shaft 1, the V-shaped hole 143v has a minute angle in a direction opposite to the rotation direction with respect to the flux barrier 143f. It is shifted relatively only θ _14.

In the present embodiment, the angle θ _{14 at} which the V-shaped hole 143v is displaced relative to the flux barrier 143f is within a range that satisfies the positioning condition of the air hole 143 with respect to the magnet hole 142, and the V-shaped hole 143v and the flux The angle is set within a range where a region where the barrier 143f overlaps each other is formed (that is, a range where the V-shaped hole 143v and the flux barrier 143f communicate with each other). The design of the angle θ ₁₄ can be changed as appropriate according to the hole width of the magnet hole 142 and the hole 143.

  A plurality (six in this embodiment) of shaft holes 144 are arranged in the first core 141a and the second core 141b, respectively, at an equal pitch in the circumferential direction. Each shaft hole 144 is formed at a portion located on the outer side in the radial direction from the magnet hole 142 and the air hole 143, but may be formed at other positions in each core. In the present embodiment, the relative positional relationship between the shaft holes 144 and the flux barriers 142f and 143f in the first core 141a and the second core 141b is all the same.

In the present embodiment, the positional relationship of each core when the second core 141b is stacked on the first core 141a is as follows. In other words, the flux barrier 142f of the magnet hole 142, the flux barrier 143f of the air hole 143, and the shaft holes 144 provided in the cores are laminated in phase with each other. At this time, only the phase of the V-shaped hole 143v among the holes 143 in the second core 141b is at a position displaced to the small angle theta ₁₄ only circumferential direction with respect to the V-shaped hole 142v of the magnet hole 142 in the first core 141a Be placed. For this reason, the magnet 2 embedded in the magnet hole 142 is partially covered by a part of the second core 141 b in the vicinity of the peripheral edge of the hole 143.

  Next, a method for manufacturing the rotor 140 according to this embodiment will be described. The rotor 140 of the present embodiment can be manufactured by a method similar to that of the rotor 10 described above by mainly changing the second step in the method of manufacturing the rotor 10 described above as follows.

In the present embodiment, in the second step, the core sheet S ₁₄ a (see FIG. 28) constituting the first core 141 a and the core sheet S ₁₄ b (see FIG. 29) constituting the second core 141 b are set in a predetermined manner. It is punched using a mold. The core sheet S ₁₄ a and the core sheet S ₁₄ b are formed in different shapes. More specifically, only the magnet holes H _M of each core sheet S (the magnet hole H _M a and a magnet hole H _M b) are formed in different shapes.

First, the process of forming the core sheet S ₁₄ a constituting the first core 141 a will be described. As shown in FIG. 28, in this step, by using a plurality of molds to partially correspond to the components of the core sheet S ₁₄ a, the components of the core sheet S ₁₄ a is stepwise punching The Specifically, the mold Mo1 corresponding to the core sheet S ₁₄ a inner peripheral portion IP and a shaft hole portion H _A (FIG. 28 (a)), corresponding to the V Jiana portion H _v of the magnet hole H _M mold Mo2 (Fig 28 (b)), mold Mo3 corresponding to flux barrier H _f of the magnet hole H _M (FIG. 28 (c)), and a mold corresponding to the outer peripheral portion OP of the core sheet S ₁₄ a Using Mo4 (FIG. 28 (d)), punching of the electromagnetic steel sheet ST is performed in four stages.

In this embodiment, the mold Mo1 corresponding to the shaft hole portion H _A and mold Mo2 corresponding to V Jiana portion H _v of the magnet hole H _M are arranged in all equal pitches. Further, the mold Mo3 corresponding to flux barrier H _f of the magnet hole H _M are arranged at a pitch corresponding to both end portions of the V Jiana portion H _v. Each of these molds is constituted by an integral unit that can simultaneously punch and form corresponding components at a desired position by a single punching.

Moreover, in this embodiment, the fixed metal mold | die with which the punching position with respect to the electromagnetic steel plate ST was fixed and the movable metal mold | die which can change the punching position with respect to the electromagnetic steel sheet ST relatively are used as each metal mold | die mentioned above. The “punching position” here refers to a relative position in the sheet surface direction of the electromagnetic steel sheet ST. In the present embodiment, only mold Mo2 corresponding to V Jiana portion H _v of the magnet hole H _M is composed of a movable mold, other is composed of a fixed mold, but at least, the magnet hole the mold Mo2 corresponding to V Jiana portion H _v of H _M, unless the mold Mo3 corresponding to flux barrier H _f of the magnet hole H _M is formed together with different types of mold, suitably selected Is possible.

The core sheet S ₁₄ a shown in FIG. 28 (d) is formed by punching out a predetermined position of the electromagnetic steel sheet ST using each mold described above. It is not particularly limited punching order of the components in the core sheet S ₁₄ a, it can be arbitrarily changed.

Next, steps of forming a core sheet S ₁₄ b constituting the second core 141b. The mold used in this step is the same as the mold for forming the above-described core sheet S ₁₄ a. Therefore, in the description of this step, the description common to the step of forming the core sheet S ₁₄ a is omitted as appropriate, and only the steps having differences will be described.

In the present embodiment, the movable mold constituting the mold Mo2 corresponding to V Jiana portion H _v of the magnet hole H _M passes a certain point from the tip of every V Jiana portion H _v equidistant A mold that can rotate in the circumferential direction about a normal axis perpendicular to the sheet surface of the electromagnetic steel sheet ST is employed. In this step, as shown in FIG. 29 (b), when forming the V Jiana portion H _v of the magnet hole H _M, about the normal axis of the mold Mo2 corresponding thereto to the electromagnetic steel sheets ST Are rotated relatively by a minute angle θ ₁₄ to punch out a predetermined position of the electromagnetic steel sheet ST. Thus, V Jiana portion H _v of the magnet hole H _M is formed in the rotation direction or position shifted relatively small angle theta ₁₄ in the opposite direction of the rotor 140 with respect to the shaft hole portion H _A .

Meanwhile, when forming the flux barrier H _f of the magnet hole H _M, punching position relative to the electromagnetic steel sheets ST mold Mo3 corresponding thereto is fixed, the punching position in the step of forming the core sheet S ₁₄ a Is the same. Therefore, the peripheral shape of the magnet hole H _M which is formed in the core sheet S ₁₄ b will periphery shape different from the shape of the magnet hole H _M which is formed in the core sheet S ₁₄ a. In this way, the core sheet S ₁₄ b shown in FIG. 29D is formed.

Then, using the core sheet S ₁₄ a and the core sheet S ₁₄ b formed in the second step, the first core 141 a and the second core 141 b are respectively prepared (third step and fourth step), and the magnet hole 142 is prepared. The rotor 140 according to this embodiment is manufactured by stacking the second core 141b on both end faces of the first core 141a having the magnet 2 embedded therein (fifth step).

Thus, configured in accordance with the rotor 140 and its manufacturing method of the present embodiment, the first core 141a and core sheet S of different shapes second core 141b (core sheet S ₁₄ a and the core sheet S ₁₄ b) Thus, the process of stacking the second core 141b on one end surface, the other end surface, or both end surfaces of the first core 141a to prevent the magnet 2 from being removed can be greatly simplified. Specifically, the planar shapes of the first core 141a and the second core 141b are different from each other only in the planar shapes of the magnet hole 142 and the air hole 143, so that the second core with respect to the first core 141a at the time of stacking is formed. The positioning of 141b can be substantially omitted.

  The planar shapes of the first core magnet holes and the second core holes may be different from each other in other forms. For example, a form like the rotor 150 shown in FIG. 30 may be sufficient. The rotor 150 is a first modification of the rotor 140 described above, and similarly to the rotor 140, the first core 151a and the second core 151b constituting the rotor core 151 are different in core sheet S (see FIGS. 31 and 31). 32). More specifically, the planar shape of the magnet hole 152 provided in the first core 151a and the planar shape of the hole 153 provided in the second core 151b are different as follows.

  The magnet hole 152 includes a rectangular hole 152r in which the magnet 2 is embedded, and a flux barrier 152f provided at both ends of the rectangular hole 152r, and is formed in a substantially concave shape in plan view. In the present embodiment, a plurality (four in this embodiment) of the magnet holes 152 are arranged in the first core 151a in the circumferential direction at an equal pitch. The planar shapes of the magnet holes 152 are all the same.

  On the other hand, the air hole 153 includes a rectangular hole 153r having the same plane shape as the rectangular hole 152r constituting a part of the magnet hole 152, and a flux barrier 153f provided at both ends of the rectangular hole 153r. It is formed in a concave shape. In the present embodiment, a plurality (four in the present embodiment) of the holes 153 are arranged in the second core 151b in the circumferential direction at an equal pitch. In the present embodiment, the positional relationship between the rectangular hole 153r and the flux barrier 153f in the hole 153 is different from the positional relationship between the rectangular hole 152r and the flux barrier 142f in the magnet hole 152.

In the present embodiment, the planar shapes of the holes 153 are all formed in different shapes. Specifically, when compared with the magnet hole 152 as a reference, the air holes 153 of the present embodiment are formed at positions where only the rectangular holes 153r are shifted from the magnetic pole P in the 45 ° direction. The “45 ° direction with respect to the magnetic pole P” here refers to a direction parallel to a straight line that forms 45 ° with respect to a straight line connecting the axis O of the rotating shaft 1 and the pole center P _{C of the} magnetic pole P. In the present embodiment, the positional relationship between the rectangular holes 153r is the same as the positional relationship between the rectangular holes 152r in the magnet hole 152. That is, it can be said that each rectangular hole 153r is provided at a position translated from the magnetic pole P by a predetermined distance in the 45 ° direction.

  In the present embodiment, the distance that the rectangular hole 153r is displaced relative to the flux barrier 153f is a range that satisfies the positioning condition of the air hole 153 with respect to the magnet hole 152, and the rectangular hole 153r and the flux barrier 153f are separated from each other. The distance is set within a range where overlapping regions are formed (that is, a range where the rectangular hole 153r and the flux barrier 153f communicate with each other). The design of the distance can be appropriately changed according to, for example, the hole width of the magnet hole 152 and the hole 153.

  In the present embodiment, the positional relationship of each core when the second core 151b is stacked on the first core 151a is as follows. In other words, the flux barrier 152f of the magnet hole 152 and the flux barrier 153f of the air hole 153 are stacked so that the phases thereof coincide with each other. At this time, only the position of the rectangular hole 153r among the holes 153 in the second core 151b is arranged at a position shifted by a predetermined distance in the above-described direction. For this reason, the magnet 2 embedded in the magnet hole 152 is partially covered by a part of the second core 151 b in the vicinity of the peripheral edge of the hole 153.

  Next, a method for manufacturing the rotor 150 according to the present embodiment will be described. The rotor 150 of the present embodiment can be manufactured by a method similar to that of the rotor 140 by mainly changing the second step in the method of manufacturing the rotor 140 described above as follows.

In the present embodiment, in the second step, the core sheet S ₁₅ a (see FIG. 31) that constitutes the first core 151 a and the core sheet S ₁₅ b (see FIG. 32) that constitutes the second core 151 b It is punched using a mold. The core sheet S ₁₅ a and the core sheet S ₁₅ b are formed in different shapes. More specifically, only the magnet holes H _M of each core sheet S (the magnet hole H _M a and a magnet hole H _M b) are formed in different shapes.

First, the process of forming the core sheet S ₁₅ a constituting the first core 151 a will be described. As shown in FIG. 31, in this step, by using a plurality of molds to partially correspond to the components of the core sheet S ₁₅ a, the components of the core sheet S ₁₅ a are stepwise punched The Specifically, the mold Mo1 corresponding to the inner peripheral portion IP of the core sheet S ₁₅ a and a shaft hole portion H _A (FIG. 31 (a)), the mold corresponding to the flux barrier H _f of the magnet hole H _M Mo3 (Figure 31 (b)), mold Mo2 corresponding to a rectangular hole H _r of the magnet hole H _M (FIG. 31 (c)), and the core sheet S ₁₅ the mold corresponding to the outer peripheral portion OP of a Mo4 (FIG. 31 (d)) is used, and punching formation is performed on the electromagnetic steel sheet ST in four stages.

In addition, since the other structure of the metal mold | die used in this process is common with each metal mold | die used in the manufacturing method of the rotor 140 mentioned above, detailed description is abbreviate | omitted here. A core sheet S ₁₅ a shown in FIG. 31 (d) is formed by punching out a predetermined position of the electromagnetic steel sheet ST using the above-described molds. It is not particularly limited punching order of the components in the core sheet S ₁₅ a, it can be arbitrarily changed.

Next, the process of forming the core sheet S ₁₅ b that constitutes the second core 151 b will be described. The mold used in this step is the same as the mold for forming the core sheet S ₁₅ a described above. Therefore, in the description of this step, the description common to the step of forming the core sheet S ₁₅ a will be omitted as appropriate, and only the steps having differences will be described.

In this step, as shown in FIG. 32 (b), is punched forming a flux barrier H _f of the magnet hole H _M above. In this step, punching position relative to the electromagnetic steel sheets ST mold Mo3 corresponding to each flux barrier H _f is fixed, is the same as the punching position in the step of forming the core sheet S ₁₅ a as described above. Therefore, the phases of the flux barrier H _f are the same in the core sheet S ₁₅ a and the core sheet S ₁₅ b.

Next, a rectangular hole H _r of the magnet hole H _M is punched. In the present embodiment, the movable mold constituting the mold Mo2 corresponding to a rectangular hole H _r of the magnet hole H _M, the movable mold parallel in any direction parallel to the sheet surface of the electromagnetic steel sheets ST is It has been adopted. In this step, as shown in FIG. 32 (c), extending the time to, the flux barrier H _f of the mold Mo2 corresponding thereto has already been punched to form the rectangular holes H _r of the magnet hole H _M A predetermined position of the electromagnetic steel sheet ST is punched out by being translated by a predetermined distance in a direction parallel to the outgoing direction. Thus, rectangular holes H _r of the magnet hole H _M is formed at a position displaced a predetermined distance in the 45 ° direction with respect to the pole P.

Thus, the peripheral shape of the magnet hole H _M which is formed in the core sheet S ₁₅ b will be different shapes and peripheral shape of the magnet hole H _M which is formed in the core sheet S ₁₅ a. In this way, the core sheet S ₁₅ b shown in FIG. 32D is formed.

  In the rotor 150 described above, the case where the number of poles of the magnetic pole P is four is illustrated, but the same applies to the case where the number of poles of the magnetic pole P is six. For example, a form like the rotor 160 shown in FIG. 33 may be sufficient. The rotor 160 is a second modification of the rotor 140 described above, and similarly to the rotor 150, the first core 161a and the second core 161b that constitute the rotor core 161 have different core sheets S (FIGS. 34 and 35). Reference). When the rotor 160 is compared with the magnet hole 162 provided in the first core 161a as a reference, only the rectangular holes 163r in the air holes 163 of the second core 161b are in the longitudinal direction of all the rectangular holes 163r. It is formed at a position shifted by a predetermined distance in the non-parallel direction.

  In the present embodiment, each rectangular hole 163 is formed at a position shifted in a direction perpendicular to the longitudinal direction of the pair of rectangular holes 163r facing each other. As a result, like the rotor 150 described above, all the magnets 2 embedded in each magnet hole 163 are partially covered by a part of the second core 161b in the vicinity of the periphery of each hole 163.

  The reason for setting the direction in which the rectangular holes 163r are relatively displaced in the air holes 163 of the present embodiment as described above is as follows. That is, in the present embodiment, even if the rectangular hole 163r is formed with the hole 163 formed at a position shifted in the direction parallel to the longitudinal direction of the rectangular hole 163r, the second core 161b in the vicinity of the peripheral edge of the hole 163 is formed. A part of the magnet 2 cannot partially cover the magnet 2 embedded in the magnet hole 162. For this reason, it is because the 2nd core 161b cannot be functioned as a core for retaining the magnet 2.

The rotor 160 can be manufactured by the same method as the rotor 150 described above. In the present embodiment, in the second step, the core sheet S ₁₆ a (see FIG. 34) that constitutes the first core 161 a and the core sheet S ₁₆ b (see FIG. 35) that constitutes the second core 161 b It is punched using a mold. The core sheet S ₁₆ a and the core sheet S ₁₆ b are formed in different shapes. More specifically, only the magnet holes H _M of each core sheet S (the magnet hole H _M a and a magnet hole H _M b) are formed in different shapes.

First, the process of forming the core sheet S ₁₆ a constituting the first core 161 a will be described. As shown in FIG. 34, in this step, by using a plurality of molds to partially correspond to the components of the core sheet S ₁₆ a, the components of the core sheet S ₁₆ a are stepwise punched The Kim Specifically, mold Mo1 corresponding to the core sheet S ₁₆ a inner peripheral portion IP and a shaft hole portion H _A of (FIG. 34 (a)), corresponding to a rectangular hole H _r of the magnet hole H _M type Mo2 (Fig 34 (b)), mold Mo3 corresponding to flux barrier H _f of the magnet hole H _M (FIG. 34 (c)), and the mold corresponding to the outer peripheral portion OP of the core sheet S ₁₆ a Mo4 (FIG. 34 (d)) is used, and punching formation is performed on the electromagnetic steel sheet ST in four stages. A core sheet S ₁₆ a shown in FIG. 34 (d) is formed by punching a predetermined position of the electromagnetic steel sheet ST using these molds.

Next, steps of forming a core sheet S ₁₆ b constituting the second core 161b. The mold used in this step is the same as the mold for forming the above-described core sheet S ₁₆ a. Therefore, in the description of this step, the description common to the step of forming the core sheet S ₁₆ a is omitted as appropriate, and only the steps having differences are described.

In this step, as shown in FIG. 34 (b), of the magnet hole H _M when forming a rectangular hole H _r, the mold Mo2 corresponding thereto, a pair of rectangular holes 163r facing each other A predetermined position of the electromagnetic steel sheet ST is punched out by being translated by a predetermined distance in a direction perpendicular to the longitudinal direction. Thus, rectangular holes H _r of the magnet hole H _M is formed at a position displaced a predetermined distance in a non-parallel direction to the longitudinal direction of all of the rectangular hole H _r.

Meanwhile, when forming the flux barrier H _f of the magnet hole H _M, punching position relative to the electromagnetic steel sheets ST mold Mo3 corresponding thereto is fixed, the punching position in the step of forming the core sheet S ₁₆ a Is the same. Therefore, the peripheral shape of the magnet hole H _M which is formed in the core sheet S ₁₆ b will periphery shape different from the shape of the magnet hole H _M which is formed in the core sheet S ₁₆ a. In this way, the core sheet S ₁₆ b shown in FIG. 35 (d) is formed. In addition, it is preferable that the width | variety which the 2nd core suppresses the magnet 2 is less than magnet thickness at the maximum.

  Thus, also in the rotor 150, the rotor 160, and these manufacturing methods, the effect | action and effect similar to the rotor 140 mentioned above can be acquired.

  In each of the rotors 10 to 160 according to the above-described embodiments, the second core is laminated as a retaining core for the magnet 2 on both end faces of the first core. The core does not necessarily have to be stacked on both end faces of the first core.

For example, in the rotor core 11 shown in FIG. 1B, one of the second cores 11b arranged on one end surface side (upper side) and the other end surface side (lower side) of the first core 11a is made of stainless steel or the like. You may be comprised with the end plate which consists of a nonmagnetic material. Although illustration is omitted, this end plate is formed in an annular shape whose outer periphery and inner periphery are the same as those of the first core 11a and the second core 11b, and no magnet hole (hole) is provided. Only the hole 14 is provided at a predetermined position. The thickness of the end plate, from the viewpoint of mechanical strength ensured, each core sheet S ₁ having a thickness which constitute the first core 11a and the second core 11b (or lamination thickness of the second core 11b) constituting greater than Is desirable.

  Moreover, when using the rotary electric machine provided with the rotor (the rotor 10 mentioned above is illustrated in the following description) of this invention, for example for the rotary compressor for refrigerant | coolants used for an air conditioner, the rotor which concerns on this invention is used. You may comprise as follows.

  That is, the rotor core 11 is disposed on the one end side or the other end side in the axial direction with respect to the outer peripheral surface of the rotor core 11 facing the stator disposed at a predetermined gap in the radial direction. A non-opposing portion that protrudes in the axial direction with respect to the stator, and the end plate described above is disposed at the axial end on the opposite side of the non-opposing portion of the opposing portion. Also good.

  The refrigerant rotary compressor is a kind of volumetric compressor, and includes a compression mechanism having a cylinder and a piston disposed in the cylinder. The compression mechanism sucks the refrigerant supplied from the accumulator into the cylinder by operating the piston, and compresses the sucked refrigerant. A rotating electrical machine is used as a power source for operating this piston (a configuration corresponding to a piston when the compression mechanism is in another form).

  In such a compressor, the rotor 10 is disposed with one end side (upper side) of the rotor core 11 protruding in the axial direction with respect to the stator in order to generate a pressing force downward on the piston. Is common. At this time, downward force also acts on the magnet 2 embedded in each magnet hole 12. Such a force is called a thrust force. In this embodiment, the mechanical strength of the rotor 10 can be ensured by providing the above-mentioned end plate at the end on the side where the thrust force acts.

  It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Moreover, you may implement with the form which substituted any invention specific matter to the other technique within the range which the same effect | action or effect produces.

For example, as a positioning means with respect to the first cores 21a and 31a of the second cores 21b and 31b in the rotors 20 and 30 described above, protrusions as shown in FIGS. 7 and 8 are provided at predetermined positions of the core sheets S ₂ and S ₃ . B or a through hole H _B may be provided, and caulking that can fix the positional relationship between each other at a position rotated by a minute angle in the rotation direction or the opposite direction may be employed.

  In addition, the rotors 10 to 160 and the like of each of the embodiments described above are all integrated rotors, but the present invention can also be applied to a so-called divided rotor in which the rotor core is divided in the circumferential direction. In this case, after integrating the first core and the second core into a cylindrical shape, the second core may be laminated on the first core. According to the rotor of this embodiment, since the easy magnetization axis can be made to coincide with the radial direction in each magnetic pole of the rotor core, there is an advantage that the magnetic characteristics of the rotor can be improved.

  Furthermore, the rotors 10 to 160 and the like of each of the embodiments described above are all inner rotors, but the present invention can also be adopted for an outer rotor. In this case, the magnetic pole is formed on the inner peripheral side of the rotor core. Therefore, the surface facing the stator is also the inner peripheral surface of the rotor core.

  Even if it is a form which concerns on such a modification / combination example, while being able to solve the subject of this invention similarly to rotor 10-160 grade | etc., Of each embodiment mentioned above, there exists the same effect | action and effect. .

1: rotating shaft 2: magnet 10-160: rotor 11-161: rotor core 11a-161a: first core 11b-161b: second core 12-162: magnet hole 13-163: hole 14-34, 144-164 : shaft hole B: projections S ₁ to S _16: core sheet P: pole P _C: the center of a pole H _A: shaft hole portion H _M: magnet hole F: fixed member s: shank theta _P: pole pitch O: Axis ST: Electrical steel sheet

Claims (22)

A rotor core formed by laminating a plurality of core sheets formed of electromagnetic steel sheets in a predetermined shape in the axial direction of the rotating shaft, and a plurality of magnets embedded in a plurality of magnet holes provided in the rotor core, and having different polarities A rotor in which magnetic poles are alternately arranged in the rotation direction,
The rotor core is
A cylindrical first core having a plurality of the magnet holes penetrating in the axial direction;
A cylindrical second layer that is stacked on one end surface, the other end surface, or both end surfaces of the first core, has a plurality of holes that penetrate in the axial direction, and has the same inner and outer diameter dimensions as the first core. A core, and
The number of holes and the hole width thereof are the same as the number of magnet holes and the hole width thereof,
A rotor characterized in that a part of the magnet embedded in the magnet hole is covered by a part of the second core in the vicinity of the periphery of the hole. The first core and the second core are composed of the core sheet having the same shape,
The rotor according to claim 1, wherein the hole is disposed at a position that is relatively displaced in the surface direction of the core sheet with respect to the magnet hole. The rotor core is
A plurality of shaft holes that penetrates in the axial direction from one end surface to the other end surface and through which a shaft portion of a predetermined length provided in a fixing member that fixes the first core and the second core are inserted,
The shaft hole is formed by a plurality of shaft hole portions formed at predetermined positions of the core sheet being arranged in communication in the axial direction across the first core and the second core,
The shaft hole is
In the first core, it is arranged at a position shifted by a predetermined angle in the rotation direction from the pole center of the magnetic pole or between the poles of the magnetic pole adjacent in the circumferential direction,
3. The rotor according to claim 2, wherein the second core is disposed at a position shifted by a predetermined angle in a direction opposite to the rotation direction from the pole center of the magnetic pole or between the poles adjacent to each other in the circumferential direction.   3. The rotor according to claim 2, wherein the second core is stacked so as to be shifted from the n magnetic pole pitch (n is an integer) by a predetermined angle with respect to the first core in the rotational direction or the opposite direction. The core sheet is
A plurality of shaft holes that penetrates in the axial direction from one end surface to the other end surface of the rotor core and through which a shaft portion of a predetermined length provided in a fixing member that fixes the first core and the second core is inserted. A plurality of axial hole portions, or a plurality of protrusions that caulk each core sheet adjacent in the axial direction,
The shaft hole portion or the projection portion includes a first shaft hole portion or a first projection portion provided at a predetermined position of the core sheet, and an n magnetic pole pitch with respect to the first shaft hole portion or the first projection portion. A second shaft hole or a second protrusion provided at a position deviated by a predetermined angle from (n is an integer) in the rotational direction or the opposite direction,
The said 1st axial hole part or the said 1st projection part in the said 2nd core is laminated | stacked corresponding to the said 2nd axial hole part or the said 2nd projection part in the said 1st core. Rotor. The core sheet is
The magnet hole and the hole are configured, and a magnet hole portion having a different peripheral shape depending on the magnetic pole is provided,
3. The rotor according to claim 2, wherein the second core is shifted in the n-pole pitch (n is an integer) rotation direction or the opposite direction with respect to the first core. The core sheet is
The magnet hole and the hole are configured, the peripheral shape thereof is the same, and a magnet hole portion that is asymmetric with respect to a straight line passing through the pole center of the magnetic pole and the axis of the rotating shaft,
The rotor according to claim 2, wherein the magnet hole in the first core and the hole in the second core are arranged symmetrically with respect to the straight line. The first core and the second core are composed of the core sheets having different shapes,
2. The rotor according to claim 1, wherein the first core and the second core have different planar shapes from each other only in the planar shape of the magnet hole and the hole.   The portion of the second core that is positioned on the outer side in the radial direction than the hole is disposed on the outer side in the radial direction with respect to the peripheral edge of the magnet hole that is positioned on the inner peripheral side of the first core. The rotor according to any one of claims 1 to 8.   The rotor according to any one of claims 1 to 9, wherein the core sheet is made of an electromagnetic steel plate having a thickness of 0.5 mm or more.   The rotor according to any one of claims 1 to 10, further comprising an end plate made of a nonmagnetic material disposed on one end surface or the other end surface of the rotor core. The rotor core is disposed on the one end side or the other end side in the axial direction from the opposed portion, facing the stator disposed with a gap of a predetermined interval in the radial direction with respect to the outer peripheral surface, A non-opposing portion arranged to protrude in the axial direction with respect to the stator,
The rotor according to claim 11, wherein the end plate is disposed at an end portion in the axial direction on the opposite side of the facing portion from the non-facing portion. The holes are arranged to be shifted in the direction opposite to the rotation direction with respect to the magnet holes;
The said 2nd core is facing the stator arrange | positioned in the radial direction with the gap of predetermined spacing with respect to the outer peripheral surface of the said rotor core. The described rotor. Magnets are embedded in a plurality of magnet holes provided in a rotor core formed by laminating a plurality of core sheets formed of electromagnetic steel sheets in a predetermined shape in the axial direction of the rotation axis, and magnetic poles of different polarities are alternately arranged in the rotation direction A method for manufacturing a rotor, comprising:
A first step of preparing the electromagnetic steel sheet;
A second step of punching the electromagnetic steel sheet with a predetermined mold to form a peripheral edge of the core sheet and forming a magnet hole of a predetermined shape penetrating in the axial direction at a predetermined position;
A third step of laminating a plurality of the core sheets so that the magnet hole portions communicate in the axial direction, and preparing a cylindrical first core having the plurality of magnet holes penetrating in the axial direction;
A plurality of the core sheets are laminated so that the magnet hole portions communicate with each other in the axial direction, or one core sheet is prepared, thereby having a plurality of holes penetrating in the axial direction, A fourth step of preparing a cylindrical second core having the same diameter as the first core;
By embedding the magnet in each magnet hole of the first core, and laminating the second core in a predetermined positional relationship with respect to one end surface, the other end surface, or both end surfaces of the first core. A fifth step of covering a part of the magnet embedded in the magnet hole with a part of the second core in the vicinity of the periphery of the hole;
A method for manufacturing a rotor, comprising: The core sheets formed in the second step are all the same shape,
The method for manufacturing a rotor according to claim 14, wherein in the fifth step, the holes are disposed at positions that are relatively displaced in the surface direction of the core sheet with respect to the magnet holes. The second step includes
A plurality of shaft holes that penetrates in the axial direction from one end surface to the other end surface of the rotor core and through which a shaft portion of a predetermined length provided in a fixing member that fixes the first core and the second core is inserted. Including a shaft hole portion forming step of forming a plurality of shaft hole portions at predetermined positions of the core sheet,
In the shaft hole portion forming step, the shaft hole portion is formed at a position shifted by a predetermined angle in the rotation direction or in the opposite direction from the pole center adjacent to the pole center or the circumferential direction of the magnetic pole in the core sheet. ,
The method for manufacturing a rotor according to claim 15, wherein in the fifth step, the second core is laminated upside down with respect to the first core.   The said 5th process WHEREIN: The said 2nd core is rotated and rotated by the angle which shifted | deviated the predetermined angle from n magnetic pole pitch (n is an integer) with respect to the said 1st core, and is laminated | stacked. A method for producing the rotor according to claim 1. In the second step, a plurality of the magnet hole portions having different peripheral shapes depending on the magnetic poles are formed at predetermined positions of the core sheet,
The rotor manufacturing according to claim 15, wherein in the fifth step, the second core is laminated by rotating in the rotating direction or the opposite direction by an n magnetic pole pitch (n is an integer) with respect to the first core. Method. In the second step, a plurality of the magnet hole portions that have the same peripheral shape and are asymmetric with respect to a straight line passing through the pole center of the magnetic pole and the axis of the rotation shaft are arranged at predetermined positions of the core sheet. Formed into
The method for manufacturing a rotor according to claim 15, wherein in the fifth step, the second core is laminated upside down with respect to the first core.   The core sheet formed in the second step is different in shape between the core sheet constituting the first core and the core sheet constituting the second core, and only the magnet hole portion is different. The method for manufacturing a rotor core according to claim 14, wherein the rotor core is formed. In the second step,
As the mold, a fixed mold in which the punching position with respect to the electromagnetic steel sheet is fixed, and a movable mold that can relatively change the punching position with respect to the electromagnetic steel sheet, are used.
Forming the peripheral edge of each core sheet with the fixed mold, and forming the magnet hole of each core sheet with the movable mold;
21. The rotor according to claim 20, wherein when the core sheet constituting the second core is formed, the magnet hole is formed by rotating the movable mold by a predetermined angle in the rotation direction or in the opposite direction. Method. In the second step,
The magnet hole is formed by moving the movable mold by a predetermined distance along a direction intersecting with a longitudinal direction of the magnet hole when forming a core sheet constituting the second core. The method for manufacturing a rotor core according to claim 21.

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