JP6607150B2 - Rotating electrical machine rotor - Google Patents

Description

  The present disclosure relates to a rotor of a rotating electrical machine, and more particularly, to a rotor of an embedded magnet type rotating electrical machine.

  The rotor core of an interior permanent magnet rotating electric machine forms a laminated body in which a plurality of magnetic thin plates each having a magnet insertion hole for arranging a permanent magnet are laminated, and each magnet insertion hole has a permanent magnet. It is manufactured by inserting and embedding. In the case of a permanent magnet with a rectangular cross section, the magnet insertion hole is a larger rectangular hole than the permanent magnet, but the both ends of the rectangular hole are extended to narrow the magnetic path between adjacent magnet insertion holes, and the bridge portion is Forming and suppressing leakage of magnetic flux between adjacent permanent magnets is performed.

  In Patent Document 1, each magnetic pole is formed by a pair of permanent magnets arranged in a V shape in the rotor core, and the positioning of the permanent magnets in the circumferential direction is performed in a pair of magnet insertion holes arranged in a V shape in each magnetic pole. It is disclosed that a protruding portion is provided. Here, in each magnet insertion hole, protrusions are provided on the outer peripheral side surface on the central bridge portion side and on the inner peripheral side surface on the anti-center bridge portion side, respectively.

  In Patent Document 2, if a positioning part is formed to project toward the permanent magnet at the edge of the magnet insertion hole for positioning the permanent magnet in the magnet insertion hole, the magnetic path between the adjacent magnet insertion holes is formed by the positioning part. Point out that the area increases and the leakage of magnetic flux increases.

  Therefore, among the plurality of magnetic poles in one magnetic thin plate, a positioning portion is provided only in the magnet insertion hole corresponding to one magnetic pole, and a positioning portion is not provided in the magnet insertion hole corresponding to the other magnetic pole. At this time, the product is shifted by one magnetic pole to enable positioning of all permanent magnets.

JP 2014-60835 A JP 2014-07925 A

  In order to achieve both the positioning of the permanent magnet and the suppression of the leakage of magnetic flux between adjacent permanent magnets, if a magnet insertion hole with positioning and a magnet insertion hole without positioning are provided, the electromagnetic force as a rotor will be reduced. Balance occurs, causing a reduction in bearing load and noise characteristics. Therefore, there is a demand for a rotor of a rotating electrical machine that achieves positioning of a permanent magnet and suppression of leakage of magnetic flux between adjacent permanent magnets while preventing imbalance of electromagnetic force as a rotor.

  In the rotor of the rotating electrical machine according to the present disclosure, a plurality of magnetic thin plates in which the magnet insertion holes for arranging the permanent magnets forming the magnetic poles are arranged along the circumferential direction are shifted by one magnetic pole. A rotor of a rotating electrical machine formed with a permanent magnet inserted in each of the magnet insertion holes, and the magnetic thin plate is provided as one magnetic pole at the center line of the magnetic pole. A pair of magnet insertion holes arranged in a V shape that are arranged symmetrically with respect to each other, have a distance between each other toward the outer peripheral side of the rotor, and form bridge portions that are close to each other on the inner peripheral side. A first magnetic pole portion having an outer peripheral projection for positioning the permanent magnet on each of the outer peripheral short sides of the magnet insertion hole, and a pair of first magnetic pole portions not having a positioning projection on each of the inner peripheral short sides; Each of the inner peripheral short side of the magnet insertion hole It has an inner peripheral side protrusion for positioning of the permanent magnets, each of the outer peripheral side short side and the second pole portion having no protrusion for positioning, but are arranged alternately in the circumferential direction.

  According to the rotor of the rotating electrical machine according to the present disclosure, it is possible to achieve positioning of the permanent magnet and suppression of leakage of magnetic flux between adjacent permanent magnets while preventing imbalance of electromagnetic force as the rotor.

It is a perspective view of the rotor of the rotary electric machine which concerns on this Embodiment. FIG. 2 is a top view of FIG. 1. It is a figure which isolate | separates and shows four magnetic body thin plates laminated | stacked continuously among the laminated bodies of the rotor of the rotary electric machine of FIG. FIG. 3A is a perspective view of four magnetic thin plates, and FIGS. 3B and 3C are views showing the positioning of the permanent magnets hatched in FIG.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings. The shape, material, number of holes, number of magnetic poles, and the like described below are examples for explanation, and can be appropriately changed depending on the specifications of the rotor of the rotating electrical machine. In the following description, the same elements are denoted by the same reference symbols in all the drawings, and redundant description is omitted.

  FIG. 1 is a perspective view of a rotor 10 of a rotating electrical machine used for a rotating electrical machine mounted on a vehicle. Hereinafter, unless otherwise specified, the rotor 10 of the rotating electrical machine is referred to as a rotor 10. The rotating electrical machine using the rotor 10 is a three-phase synchronous rotating electrical machine that functions as an electric motor when the vehicle is powered and functions as a generator when the vehicle is braking. The rotating electrical machine includes a rotor 10 and an annular stator that is disposed on the outer peripheral side of the rotor 10 at a predetermined interval and around which a winding coil is wound.

  The rotor 10 includes a rotor core 12 and a center hole 14. A rotor shaft that is an output shaft of the rotating electrical machine is fixed to the center hole 14 of the rotor core 12. The rotor 10 has eight magnetic poles and includes two permanent magnets per magnetic pole. The number of magnetic poles and the number of permanent magnets per magnetic pole are examples, and can be changed according to the specifications of the rotor 10. Each permanent magnet is disposed in a magnet insertion hole 30 which is a through hole provided in the rotor core 12. Therefore, the rotor 10 includes 16 magnet insertion holes 30 and 16 permanent magnets. In FIG. 1, two permanent magnets 60 and 63 of the 16 permanent magnets are shown. The same applies to the following figures.

  The permanent magnets 60 and 63 are rectangular bar magnets having a rectangular cross-sectional shape perpendicular to the axial direction and a slightly shorter axial length than the axial length of the rotor core 12. The axial direction is the axial direction of the rotor shaft fixed to the center hole 14. FIG. 1 shows the circumferential direction and radial direction as well as the axial direction. The circumferential direction is a direction around the axial direction, and the radial direction is a direction indicating the inner peripheral side and the outer peripheral side of the rotor core 12.

  As the material of the permanent magnets 60 and 63, rare earth magnets such as neodymium magnets mainly composed of neodymium, iron and boron, and samarium cobalt magnets mainly composed of samarium and cobalt are used. Besides this, a ferrite magnet, an alnico magnet, or the like may be used.

  The rotor core 12 is a laminated body in which a predetermined number of magnetic thin plates 20 are laminated in the axial direction. The reason why the rotor core 12 is made of a laminated body of the magnetic thin plates 20 is to suppress eddy currents that can be generated in the rotor core 12, so that both surfaces of the magnetic thin plate 20 before being formed into a predetermined shape are coated with an insulating coat or the like. Insulation is applied. As a result, the laminated magnetic thin plates 20 are electrically insulated, and the eddy current that can be generated by the externally varying magnetic field is divided into small loops, and eddy current loss is suppressed.

  Each of the magnetic thin plates 20 has the same shape, but when being laminated in the axial direction, transposition is performed so as to be shifted by one magnetic pole from each other. Since the rotor core 12 of FIG. 1 has the number of magnetic poles = 8, the expected angle viewed from the center hole 14 is 45 degrees for one magnetic pole. Accordingly, the magnetic thin plates 20 are subjected to transposition in which the magnetic thin plates 20 are stacked while being shifted from each other by 45 degrees at an expected angle viewed from the center hole 14.

  In FIG. 1, four magnetic thin plates 20-1, 20-2, 20-3, and 20-4 are arranged from the one end side toward the other end with the upper side on the paper surface as one end in the axial direction. A distinction is given and shown. The magnetic thin plate 20-1 and the magnetic thin plate 20-2 are disposed at an angle of 45 degrees with respect to the expected angle seen from the center hole 14, and the magnetic thin plate 20-2 and the magnetic thin plate 20-3 are arranged. Also, the arrangement relationship is shifted by 45 degrees at the expected angle viewed from the center hole 14. In the same manner, the adjacent magnetic thin plates 20 are arranged so as to be shifted from each other by 45 degrees at an expected angle viewed from the center hole 14.

  FIG. 2 is a top view of the rotor core 12, which is also a plan view of one magnetic thin plate 20-1 on one end side in the axial direction of the rotor core 12. Since each magnetic thin plate 20 in the rotor core 12 has the same shape, the configuration of the magnetic thin plate 20-1 will be described. The magnetic thin plate 20-1 includes a center hole 14 through which the rotor shaft passes and 16 magnet insertion holes, and has an annular shape formed into a predetermined shape. An electromagnetic steel plate is used as the magnetic thin plate 20-1.

  The magnetic thin plate 20-1 has eight magnetic pole portions corresponding to eight magnetic poles and having a prospective angle of 45 degrees with respect to the center hole. The eight magnetic pole portions are composed of four first magnetic pole portions P1 and four second magnetic pole portions P2, which are alternately arranged in the circumferential direction. The difference between the first magnetic pole portion P1 and the four second magnetic pole portions P2 is the shape and arrangement of the magnet insertion holes. The first magnetic pole portions P1 and the second magnetic pole portions P2 are alternately arranged along the circumferential direction.

  The first magnetic pole portion P1 has a pair of magnet insertion holes 30 and 31, and the second magnetic pole portion P2 has a pair of magnet insertion holes 32 and 33. The pair of magnet insertion holes 30 and 31 and the pair of magnet insertion holes 32 and 33 are arranged symmetrically with respect to the center line CP of the magnetic poles, and the distance between them increases toward the outer peripheral side, and close to each other on the inner peripheral side. Arranged in a V shape.

  In addition, the pair of magnet insertion holes 30 and 31 and the pair of magnet insertion holes 32 and 33 have a hole width slightly larger than the short side dimension of the permanent magnet in the plan view, and the long side of the permanent magnet in the longitudinal direction. And end portions further extending from both ends. The ends further extending from the both ends of the long side of the permanent magnet are set in a shape that forms a bridge portion in order to restrict the flow of magnetic flux in the rotor core 12 and are filled to fix the permanent magnet. It is used as an injection port.

  As the resin for fixing the permanent magnet, a thermosetting resin excellent in moldability and heat resistance is used. As the thermosetting resin, an epoxy resin, a polyimide resin, or the like is used.

  The bridge portion is between the end portions on the inner peripheral side of the pair of magnet insertion holes in the same magnetic pole portion, between the end portions on the outer peripheral side of the magnet insertion holes adjacent to each other at the boundary with the adjacent magnetic pole portion, and each It is formed between the outer peripheral end of the magnet insertion hole and the outer peripheral surface of the rotor core 12. In FIG. 2, the bridge part 40 is a bridge part between the inner peripheral side ends of the pair of magnet insertion holes 30 and 31 in the first magnetic pole part P1, and the bridge part 42 is in the second magnetic pole part P2. It is a bridge part between the edge parts of the inner peripheral side of a pair of magnet insertion holes 32 and 33 in.

  The pair of magnet insertion holes 30 and 31 in the first magnetic pole portion P1 have outer peripheral projections 50 and 51 for positioning the permanent magnets on the outer peripheral short sides, respectively. The outer peripheral projections 50 and 51 are portions where the magnetic body portion of the magnetic thin plate 20-1 protrudes toward the permanent magnet. In the pair of magnet insertion holes 30 and 31, no permanent magnet positioning projection is provided on the short side on the inner peripheral side.

  On the other hand, the pair of magnet insertion holes 32 and 33 in the second magnetic pole portion P2 have inner peripheral projections 52 and 53 for positioning the permanent magnets on the inner peripheral short side, respectively. The inner peripheral projections 52 and 53 are portions where the magnetic body portion of the magnetic thin plate 20-1 protrudes toward the permanent magnet. In the pair of magnet insertion holes 32, 33, no permanent magnet positioning projection is provided on the short side on the outer peripheral side.

  As described above, rotor 10 according to the present embodiment includes a plurality of magnetic thin plates 20 in which magnet insertion holes for arranging permanent magnets that form magnetic poles are arranged along the circumferential direction with the number of magnetic poles = 8. . The rotor 10 is a state in which a permanent magnet is inserted into each magnet insertion hole in the rotor core 12, which is a laminated body in which a plurality of magnetic thin plates 20 are laminated in a state where they are shifted by one magnetic pole. It is the rotor of the rotary electric machine formed by. The magnetic thin plate 20-1 is arranged symmetrically with respect to the center line CP of the magnetic pole as one magnetic pole, and the distance between each other increases toward the outer peripheral side of the rotor 10, and the bridge portions 40 that are close to each other on the inner peripheral side. It has a pair of magnet insertion holes arranged in a V shape forming (or 42). Each of the outer short sides of the pair of magnet insertion holes 30 and 31 has outer peripheral projections 50 and 51 for positioning the permanent magnet, and each of the inner peripheral short sides has a positioning protrusion. The magnetic pole part that does not exist is defined as a first magnetic pole part P1. Moreover, it has the inner peripheral side projection parts 52 and 53 which position a permanent magnet in each of the inner peripheral side short side of a pair of magnet insertion holes 32 and 33, and each of the outer peripheral side short side has a positioning projection part The magnetic pole portion not having the symbol is defined as the second magnetic pole portion P2. The first magnetic pole portions P1 and the second magnetic pole portions P2 are alternately arranged in the circumferential direction.

  According to the said structure, each magnet insertion hole 30,31,32,33 has the projection part for the positioning of a permanent magnet only in either an outer peripheral side short side or an inner peripheral side short side. For example, as disclosed in Patent Document 1, it is possible to suppress the leakage of magnetic flux between adjacent magnet insertion holes as compared to providing positioning protrusions on both the outer peripheral short side and the inner peripheral short side. .

  Moreover, according to the said structure, arrangement | positioning of each magnet insertion hole 30,31,32,33 and the outer peripheral side projection part 50,51 and the inner peripheral side projection part 52,53 for positioning of a permanent magnet are each magnetic pole. The portions P1 and P2 are arranged symmetrically with respect to the center line CP of the magnetic poles. For example, as disclosed in Patent Document 2, the electromagnetic force imbalance as the rotor 10 is generated as compared with the case where a permanent magnet positioning projection is provided only in one of the plurality of magnetic pole portions. Absent.

  Further, according to the above configuration, the rotor core 12 that is a laminate is a laminate in which a plurality of magnetic thin plates 20 arranged with the number of magnetic poles = 8 are stacked in a state in which they are shifted by one magnetic pole. Is the body. Even if each magnet insertion hole 30, 31, 32, 33 has a protrusion for positioning a permanent magnet only on either the outer peripheral side short side or the inner peripheral side short side by this rolling, The magnet is firmly positioned with respect to the rotor core 12.

  As shown in FIG. 2, in the first magnetic pole portion P1, the magnet insertion holes 30, 31 and the outer peripheral projections 50, 51 are symmetrical with respect to the center line CP of the magnetic pole. The inserted permanent magnet is similarly positioned. Therefore, for the first magnetic pole portion P1, the transposition of the permanent magnet 60 inserted into the magnet insertion hole 30 will be described. Similarly, in the second magnetic pole portion P2, the magnet insertion holes 32 and 33 and the inner peripheral projections 52 and 53 are symmetrical with respect to the center line CP of the magnetic pole, so that they are inserted into any of the magnet insertion holes 32 and 33. Permanent magnets are similarly positioned. Therefore, for the second magnetic pole portion P2, the transposition of the permanent magnet 63 inserted into the magnet insertion hole 33 will be described.

  FIG. 3 is a diagram showing positioning by permanent rolling for the permanent magnets 60 and 63, and FIG. 3A shows the four magnetic thin plates 20-1 and 20-2 stacked in succession shown in FIG. It is a figure which shows 20-3 and 20-4 separately. (B), (c) shows the state where each of the permanent magnets 60, 63 is inserted into the corresponding magnet insertion hole in each of the magnetic thin plates 20-1, 20-2, 20-3, 20-4. FIG.

  As shown in (b), the permanent magnet 60 is inserted into the magnet insertion hole 30 of the first magnetic pole portion P1 in the magnetic thin plate 20-1, and the outer peripheral side positioning is performed by the outer peripheral projection 50. . The magnetic thin plate 20-2 is rotated and rolled with respect to the central hole 14 with respect to the magnetic thin plate 20-1 by an expected angle of 45 degrees that is one magnetic pole. Therefore, the permanent magnet 60 is inserted into the magnet insertion hole 32 of the second magnetic pole portion P2 in the magnetic thin plate 20-2, and the inner peripheral side positioning is performed by the inner peripheral protrusion 52. In this way, by permanent rolling, the permanent magnet 60 is composed of the two magnetic thin plates 20-1 and 20-2, and the outer peripheral projection 50 of the first magnetic pole portion P1 and the inner peripheral projection of the second magnetic pole portion P2. The two parts 52 are firmly positioned.

  In the example of FIG. 3, the transposition is further continued for the magnetic thin plates 20-3 and 20-4. The permanent magnet 60 is inserted into the magnet insertion hole 30 of the first magnetic pole portion P1 in the magnetic thin plate 20-3, and the outer peripheral side positioning is performed by the outer peripheral projection 50. In the magnetic thin plate 20-4, it is inserted into the magnet insertion hole 32 of the second magnetic pole portion P2, and the inner peripheral side positioning is performed by the inner peripheral protrusion 52.

  As shown in (c), the permanent magnet 63 is inserted into the magnet insertion hole 33 of the second magnetic pole portion P2 in the magnetic thin plate 20-1, and the inner peripheral side positioning is performed by the inner peripheral protrusion 53. ing. By rolling, in the magnetic thin plate 20-2, the permanent magnet 63 is inserted into the magnet insertion hole 31 of the first magnetic pole portion P1, and positioning on the outer peripheral side is performed by the outer peripheral projection 51. In this way, by permanent rolling, the permanent magnet 63 is composed of the two magnetic thin plates 20-1 and 20-2, and the inner peripheral protrusion 53 of the second magnetic pole portion P2 and the outer peripheral protrusion of the first magnetic pole portion P1. Positioning is firmly performed by two of the parts 51. The same applies to the magnetic thin plates 20-3 and 20-4. In the magnetic thin plate 20-3, the permanent magnet 63 is inserted into the magnet insertion hole 33 of the second magnetic pole portion P2, and the inner peripheral side protrusion 53 is positioned on the inner peripheral side. In the magnetic thin plate 20-4, it is inserted into the magnet insertion hole 31 of the first magnetic pole part P1, and the outer peripheral side positioning is performed by the outer peripheral projection 51.

  As described above, according to the above configuration, each permanent magnet is positioned with respect to the rotor core 12 by the inner ring side projection and the outer circumference projection in the magnet insertion hole.

  As described above, according to the rotor 10 according to the present embodiment, while preventing imbalance of electromagnetic force as the rotor 10, positioning of each permanent magnet and suppression of leakage of magnetic flux between adjacent permanent magnets are possible. Can be planned.

  10 (rotary electric machine) rotor, 12 rotor core (laminated body), 14 center hole, 20, 20-1, 20-2, 20-3, 20-4 magnetic thin plate, 30, 31, 32, 33 magnet insertion hole , 40, 42 Bridge portion, 50, 51 Outer peripheral projection, 52, 53 Inner peripheral projection, 60, 63 Permanent magnet.

Claims (1)

For a plurality of magnetic thin plates in which magnet insertion holes for arranging permanent magnets that form magnetic poles are arranged along the circumferential direction, in a laminated body that has been laminated in a state of being subjected to transposition that is shifted by one magnetic pole from each other, A rotor of a rotating electrical machine formed in a state where the permanent magnet is inserted into each of the magnet insertion holes,
The magnetic thin plate is
The magnetic poles are arranged symmetrically with respect to the center line of the magnetic poles, and are arranged in a V shape to form bridge portions that are close to each other on the inner peripheral side with the distance between the rotors increasing toward the outer peripheral side of the rotor. A pair of magnet insertion holes
A first magnetic pole having an outer peripheral protrusion for positioning the permanent magnet on each of the outer peripheral short sides of the pair of magnet insertion holes, and no positioning protrusion on each of the inner peripheral short sides Part,
Each of the inner peripheral short sides of the pair of magnet insertion holes has an inner peripheral protrusion that positions the permanent magnet, and each of the outer peripheral short sides does not have a positioning protrusion. A second magnetic pole portion;
A rotor of a rotating electrical machine in which are alternately arranged in the circumferential direction.

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