ELECTRIC LATHE ROTOR

Abstract

Electric lathe rotor (10) comprising: a rotor core (12) comprising a plurality of core steel sheets (13) laminated together and having a magnet hole (14) extending in an axial direction of the electric rotating machine rotor (10); a magnet (16) arranged in the magnet hole (14); and a first end plate (30) disposed adjacent to an axial end face of the rotor core (12); characterized in that: the electric lathe rotor (10) further comprises a second end plate (40) laminated adjacent to a surface of the first end plate (30) on a side opposite the surface adjacent to the axial end face, where: the core steel sheets (13), the first end plate (30) and the second end plate (40) are made of the same material, the first end plate (30) has at least one first hole (32, 33; 32a, 32b, 33a, 33b; 36, 37, 38; 50) and the first end plate (30) covers an axial end face of the magnet (16) within the magnet hole (14), viewed from an axial side of the rotor core (12), the second end plate (40) has at least one second hole (42, 43; 42a, 42b, 43a, 43b; 46, 47, 48; 60), the first hole (32, 33; 32a, 32b, 33a, 33b; 36, 37, 38; 50) and the second hole (42, 43; 42a, 42b, 43a, 43b; 46, 47, 48; 60), viewed from one axial side of the rotor core (12), overlap with at least a part of the magnet (16) in the axial end face of the magnet hole (14), and the first hole (32, 33; 32a, 32b, 33a, 33b; 36, 37, 38; 50) comprises a part which, viewed from the one axial side of the rotor core (12), is at least partially arranged at a position different from that of the second hole (42, 43; 42a, 42b, 43a, 43b; 46, 47, 48; 60).

Description

ELECTRIC LATHE INNER ROTOR

[0001] The present invention relates to an electric rotating machine rotor comprising a rotor core, a magnet inserted into a magnet hole of the rotor core, and an end plate.

[0002] With respect to an electric lathe rotor constituting an electric lathe, a configuration is known in which a magnet is inserted into a magnet hole of a rotor core and fixed to the rotor core.

[0003] JP 2013-55775 A, which is considered the closest prior art, describes a configuration in which a rotor core is formed by laminating a plurality of electromagnetic steel sheets, and magnets, which are permanent magnets, are inserted into axial holes (magnet holes) formed at a plurality of positions in the rotor core. In the above-described configuration, end plates are arranged at both axial ends of the rotor core. The end plate serves to prevent the magnets from protruding from the rotor core in the axial direction. The end plate is made of a non-magnetic substance such as aluminum and an aluminum alloy. JP 2013-55775 A describes that when the end plate is made of a non-magnetic substance, it is possible to effectively limit magnetic flux leakage at the axial ends of the magnets.

[0004] When a non-magnetic substance is used for the end plate, as in the configuration described in JP 2013-55775 A, the manufacturing cost tends to increase. Furthermore, if the end plate is formed from a steel sheet made of the same material as the steel sheet forming the rotor core, the increase in manufacturing cost is likely to be limited. However, in a case where the end plate is simply formed from a steel sheet, magnetic flux leaks easily. In the case of magnetic flux leakage, a magnetic flux emanating from the magnet leaks (is scattered) toward the end plate without being directed toward the stator. If the magnetic flux leaks, a magnetic flux short circuit, in which the magnetic flux emanating from the magnet is short-circuited by the end plate, may occur.Magnetic flux leakage and magnetic flux short-circuiting reduce the magnetic flux contributing to the torque of the electric rotating machine and increase losses, which is obviously undesirable. In a configuration where the magnets are not facing the end plate, magnetic flux leakage is unlikely, but in this case, it is difficult to limit the magnet's protrusion from the rotor core hole.

[0005] For a better understanding of the present invention, reference is also made to US 2010 / 0 141 074 A1 and EP 1 519 471 A1.

[0006] An electric lathe rotor of the present invention limits manufacturing costs, limits leakage of magnetic flux of magnets, and improves magnet protrusion preventing performance.

[0007] An electric rotating machine rotor of the present invention comprises: a rotor core comprising a plurality of core steel sheets laminated together and having a magnet hole extending in an axial direction of the electric rotating machine rotor; a magnet disposed in the magnet hole; and a first end plate disposed adjacent to an axial end surface of the rotor core. The electric rotating machine rotor is characterized by a second end plate laminated adjacent to a surface of the first end plate on a side opposite to the surface adjacent to the axial end surface, wherein the core steel sheets, the first end plate, and the second end plate are made of the same material, the first end plate has at least one first hole, and the first end plate covers an axial end surface of the magnet within the magnet hole, as viewed from an axial side of the rotor core.the second end plate has at least one second hole, the first hole and the second hole, viewed from the one axial side of the rotor core, overlap with at least a part of the magnet in the axial end face of the magnet hole, and the first hole includes a part which, viewed from the one axial side of the rotor core, is at least partially arranged at a position different from that of the second hole.

[0008] In the present embodiment, the first end plate and the second end plate are formed by steel sheets made of the same material as the steel sheet of the rotor core, so that it is possible to limit an increase in manufacturing costs. Furthermore, the first end plate covers the axial end surface of the magnet, and magnetic flux leakage of the magnet can be limited by the first leakage flux limiting hole of the first end plate. Furthermore, the second end plate is laminated on the outer side of the first end plate, and the first hole and the second hole are at least partially arranged at different positions as viewed from the one axial side. Accordingly, the first hole is at least partially closed, and magnetic flux leakage of the magnet in the second end plate can be limited by the second hole. Furthermore, it is possible to increase the magnet protrusion prevention performance.As a result, it is possible to limit the manufacturing cost, limit the magnetic flux leakage of the magnet, and improve the magnet protrusion prevention performance.

[0009] In the rotary electric machine rotor of the present invention, the rotor core may include a resin portion disposed in at least a part of a gap between the magnet hole and the magnet and extending in the axial direction. The first hole and the second hole may overlap with an axial end surface of the resin portion when viewed from one axial side; and a part where the first hole and the second hole overlap with the axial end surface of the resin portion may include a part where the first hole is at least partially disposed at a position different from that of the second hole.

[0010] With this configuration, the limitation of leakage flow through parts opposing the resin portion in the first end plate and the second end plate can be balanced with the limitation of resin protrusion due to a crack in the resin portion. In the rotary electric machine rotor of the present invention, the first hole may include a plurality of first holes arranged in the first end plate; the second hole may include a plurality of second holes arranged in the second end plate; and, as viewed from the one axial side, the plurality of first holes and the plurality of second holes may overlap with the axial end surface of the magnet.

[0011] In the configuration described above, if the ratio of holes in a unit area of ​​the first end plate is increased and each hole is small, it is possible to increase the total number of holes. This can very well balance the escape flux limitation with the magnet's protrusion limitation.

[0012] In the rotating electric machine rotor of the present invention, the rotor core may include a resin portion disposed in at least a part of a gap between the magnet hole and the magnet and extending in the axial direction; the first end plate may include a plurality of third holes; the second end plate may include a plurality of fourth holes; and, as viewed from the one axial side, the plurality of third holes and the plurality of fourth holes may overlap with the resin portion, and each of the plurality of third holes may be at least partially disposed at a position different from each position of the plurality of fourth holes.

[0013] With this preferred configuration, when the ratio of holes per unit area in a portion opposite the resin portion in each end plate is increased and each hole is small, it is possible to increase the total number of holes. This makes it possible to balance the limitation of leakage flow through the portion opposite the resin portion in the end plate with the limitation of resin protrusion caused by a crack in the resin portion.

[0014] In the rotary electric machine rotor of the present invention, the first holes and the third holes may be circular; and each diameter of the third holes may be smaller than each diameter of the first holes. With this advantageous configuration, when a ratio of the holes in a unit area in a part opposite to the resin portion in each end plate is increased and each of the holes is small, it is possible to increase the total number of holes. This makes it possible to balance a limitation of a leakage flow flowing through the part opposite to the resin portion in the end plate with a protrusion limitation of the resin due to a crack in the resin portion.

[0015] In the electric rotating machine rotor of the present invention, the arrangement pitch between the first holes can be larger than the arrangement pitch between the third holes. With this preferred configuration, the flux leakage path between the first holes can be extended. This makes it possible to further limit the occurrence of magnetic flux short circuits through the first end plate, thus limiting torque reduction and loss increase of the electric rotating machine.

[0016] In the rotary electric machine rotor of the present invention, the first end plate and the second end plate may have the same shape, and the first end plate and the second end plate may be laminated in a state where a phase of the first end plate in a circumferential direction is different from a phase of the second end plate in the circumferential direction, or the first end plate and the second end plate may be laminated in a state where either the first end plate or the second end plate is reversed.

[0017] In this preferred configuration, steel sheets having the same shape can be used for the first steel sheet of the first end plate and the second steel sheet of the second end plate, thereby making it possible to further reduce the manufacturing cost of the end plates.

[0018] With the electric lathe rotor of the present invention, it is possible to limit the manufacturing cost, limit the magnetic flux leakage of the magnet, and increase the magnet protrusion prevention capability.

[0019] Features, advantages and technical and industrial significance of exemplary embodiments of the invention are described below with reference to the accompanying drawings, in which like reference numerals designate like elements, and wherein: Fig. 1 is a half-sectional view of an electric lathe including an electric lathe rotor according to an embodiment of the present invention, and an enlarged view of a part A thereof; Fig. 2 is a view, viewed from an axial side, obtained by removing two end plates from the electric lathe rotor in Fig. 1 shows part of a rotor core and several magnets; Fig. 3 is a view showing, as seen from one axial side, a part of a first end plate which supports the electric lathe rotor in Fig. 1 forms; Fig. 4 is a perspective drawing showing, viewed from one axial side, a part of the electric lathe rotor in Fig. 1 shows; Fig. 5 a sectional view along a line BB in Fig. 4 is to describe that magnetic flux leakage can be restricted in the electric rotating machine rotor of the embodiment of the present invention; Fig. 6 is a view corresponding to the section along the BB in Fig. 4 to describe that the magnetic flux leakage occurs in a comparative example of the electric lathe rotor; Fig. 7 is a view showing, as viewed from one axial side, a part in a circumferential direction of the first end plate according to another example of the embodiment of the present invention; Fig. 8 is a view showing, viewed from one axial side, another (from the part in Fig. 7) in the circumferential direction of the first end plate according to another example of the embodiment of the present invention; Fig. 9A is a view showing, as viewed from one axial side, a part in the circumferential direction having the same phase as in Fig. 7 shows an electric lathe rotor of another example of the embodiment of the present invention; Fig. 9B is a view showing, as viewed from one axial side, a part in the circumferential direction having the same phase as in Fig. 8 shows the electric rotating machine rotor of another example of the embodiment of the present invention; Fig. 10 is a view showing, as viewed from one axial side, a part of an electric rotating machine rotor of another example of the embodiment of the present invention, and Fig. 9A; Fig. 11 is a view showing, as viewed from one axial side, a part in the circumferential direction of a first end plate according to another example of the embodiment of the present invention; Fig. 12 an enlarged view of part C in Fig. 11 is; Fig. 13 a view, seen from one axial side, of another (of the part in Fig. 11) in the circumferential direction of the first end plate according to another example of the embodiment of the present invention; Fig. 14 is a view, viewed from one axial side, of a part of an electric rotating machine rotor according to another example of the embodiment of the present invention and an enlarged view of a part D thereof; Fig. 15 is a view showing a BH characteristic of a general electromagnetic steel sheet and a BH characteristic of an electromagnetic steel sheet in an inter-hole magnetic flux path when a pin hole pitch is limited to a predetermined range in the embodiment; Fig. 16 is a view showing, as viewed from one axial side, a part in the circumferential direction of a first end plate according to another example of the embodiment of the present invention; Fig. 17 is a perspective drawing showing, as viewed from one axial side, a part in the circumferential direction in a state where a second end plate is removed from an electric rotating machine rotor according to another example of the embodiment of the present invention, and an enlarged view of a part E thereof; Fig. 18 is a view showing, from one axial side, another (from the part in Fig. 17) in the circumferential direction of a first end plate according to another example of the embodiment of the present invention; and Fig. 19 is a perspective drawing showing, as viewed from one axial side, a part of the electric rotating machine rotor according to another example of the embodiment of the present invention.

[0020] An embodiment of the present invention will be described below with reference to the drawings. A shape, material, and number described below are examples of descriptions that can be appropriately changed according to a specification of an electric lathe rotor. In the following description, equivalent elements in all drawings have the same reference numerals. Furthermore, a previously described reference numeral will be used in the description as needed.

[0021] A right drawing in Fig. 1 is a half section of an electric lathe 100 having an electric lathe rotor 10 of the embodiment, and a left drawing in Fig. 1 is an enlarged view of part A of the right drawing of Fig. 1. Fig. 2 is a view, viewed from an axial side, of a part of a rotor core 12 and a plurality of magnets 16 by removing two end plates 30, 40 from the electric lathe rotor 10. In the following description, the electric lathe rotor 10 may be referred to as the rotor 10.

[0022] The rotor 10 is used to form the electric lathe 100. The electric lathe 100 is shown in FIG. Fig. 1. The electric lathe 100 is a permanent magnet synchronous motor driven by a three-phase alternating current. For example, the electric lathe 100 is used as a motor or generator for driving a hybrid vehicle, or as a motor generator that combines the functions of both.

[0023] The rotary electric machine 100 includes a stator 110, the rotor 10 disposed on a radially inner side of the stator 110, and a rotating shaft 115. The stator 110 includes a generally tubular stator core 111 and a stator winding 114 wound around a plurality of teeth 112 protruding from an inner peripheral surface of the stator core 111. The stator 110 is mounted on an inner side of a housing (not shown).

[0024] The rotor 10 is a cylindrical member, and during operation of the rotor 10, the rotating shaft 115 is inserted into the rotor 10 and fixed thereto. The rotor 10 is arranged in the housing during operation. In the housing, the rotor 10 is arranged opposite the radially inner side of the stator 110. In this state, both ends of the rotating shaft 115 are rotatably supported relative to the housing by ball bearings (not shown). A gap is formed in a radial direction between an outer peripheral surface of the rotor 10 and an inner peripheral surface of the stator 110. This forms a rotating electric machine. In the following description, the "radial direction" refers to a radial direction of the rotor 10, and a "circumferential direction" refers to a direction along a circular shape around a center axis of the rotor 10. An "axial direction" refers to a direction along the center axis of the rotor 10.

[0025] The rotor 10 includes a rotor core 12, magnets 16, which are permanent magnets embedded in the rotor core 12 at a plurality of positions in the circumferential direction, and two end plates, namely a first end plate 30 and a second end plate 40, arranged on both sides of the rotor 10. Specifically, the rotor core 12 is formed by laminating, in the axial direction, a plurality of disc-shaped core steel sheets 13, which are the magnetic materials. A shaft hole 12a is formed in a central part of the rotor core 12, and a plurality of magnet holes 14 are formed in a region near an outer periphery of the rotor 10 around the shaft hole 12a. The rotary shaft 115 is fixed in the shaft hole 12a. The plurality of magnet holes 14 extend in the axial direction in the rotor core 12 at the plurality of positions in the circumferential direction. The magnets 16 are firmly inserted into the magnet holes 14.The first end plate 30 and the second end plate 40 are laminated on both sides of the rotor core 12, and the first end plate 30, which is arranged on an inner side, is opposed to the magnets 16 and resin portions 18a, 18b for fixing the magnets 16 (Fig. Fig. 2). This allows the protrusion of the magnets 16 and the resin portions 18a, 18b in the axial direction to be limited. Furthermore, first slots 32, 33 ( Fig. 3) (described below) are formed in respective parts in the first end plate 30 opposite the magnets 16. Furthermore, the second end plate 40 is laminated to an outer side of the first end plate 30, and second slots 42, 43 ( Fig. 4) (described below) are formed in the second end plate 40. When the rotor core 12 is viewed from an axial side, the first slots 32 and the second slots 42 are all arranged at different positions, and the first slots 33 and the second slots 43 are all arranged at different positions. This makes it possible, without using a non-magnetic substance for the end plate 30, to limit magnetic flux leakage of the magnets 16 and improve the protrusion prevention performance of the magnets 16. This will be described in more detail below.

[0026] Each of the core steel sheets 13 constituting the rotor core 12 is disc-shaped and is made of, for example, electromagnetic silicon steel. The core steel sheet 13 is formed by, for example, an annular punching of a steel sheet material with a thickness of 0.5 mm or less. In the core steel sheet 13, a shaft hole element 13a is formed in a central portion and a plurality of magnet hole elements 13b are formed around it by the punching.

[0027] When the shaft hole elements 13a of the plurality of core steel sheets 13 are connected to each other in the axial direction, the shaft hole 12a of the rotor core 12 is formed. When the plurality of magnet hole elements 13b of the plurality of core steel sheets 13 are connected to each other in the axial direction, the plurality of magnet holes 14 extending in the axial direction of the rotor core 12 are formed in the rotor core 12.

[0028] As it is in Fig. 2, the plurality of magnet holes 14 in the rotor core 12 are arranged in pairs such that two of the magnet holes 14 in each pair together form a V-shape extending radially outward (upward in Fig. 2) is open. One of the magnets 16 is inserted into each of the magnet holes 14. The magnet 16 is rectangular when viewed from one axial side and also has a rectangular solid shape in the axial direction. Further, a cuboid-shaped space extending axially in an intermediate part in the circumferential direction of the magnet hole 14 is a magnet insertion part into which a magnet is inserted. In the magnet hole 14, the resin portions 18a, 18b extending axially are arranged in at least a part of a gap between the magnet hole 14 and the magnet 16. Specifically, immediately after the magnet 16 is inserted into the magnet insertion part of the magnet hole 14, gaps are formed at both ends of the magnet hole 14.Subsequently, resin as a magnet fixing material is injected into the gaps in a molten state and cured, so that the resin portions 18a, 18b extending in the axial direction are arranged. The magnet 16 is fixed to the rotor core 12 by the resin portions 18a, 18b. In . Fig. 2, the resin sections 18a, 18b are represented by dots.

[0029] A magnetization direction of the magnet 16 is a direction perpendicular to an outer peripheral surface and an inner peripheral surface thereof. The resin injected into the gap of the magnet hole 14 is heated, for example, so that the magnet 16 is fixed in the magnet hole 14. Then, the rotor core 12 is heated by a heater (not shown). After the resin is cured in the molten state by heating, the resin is cooled to normal temperature, so that the resin portions 18a, 18b are formed.

[0030] Two adjacent magnets 16 of the plurality of magnets 16 are arranged in a pair such that the one pair of magnets 16 forms a magnetic pole 17. Specifically, two magnets 16 in a pair are arranged opposite to each other in a general V-shape along the array of the plurality of magnet holes 14 such that a distance therebetween increases toward a radially outer side of the rotor core 12. Thus, a magnetic pole 17 is formed. Fig. 2, in the rotor 10, in a magnetic pole 17 formed by two magnets 16 on a right side, magnets 16 are magnetized so that their outer peripheral surfaces become N poles, and in a magnetic pole 17 formed by two magnets 16 on a left side, magnets 16 are magnetized so that their outer peripheral surfaces become S poles.

[0031] Furthermore, an intermediate bridge B1 and two outer bridges B2 are formed in the rotor core 12 for each pair of magnets 16. The intermediate bridge B1 is a narrow flux path formed between respective circumferentially opposite ends of two of the magnet holes 14 with respect to one pair of magnets 16. The two outer bridges B2 are narrow flux paths each formed between a radially outer end of a corresponding one of the two magnet holes 14 and an outer peripheral surface of the rotor core 12 with respect to the pair of magnets 16.

[0032] As it is in Fig. 1, the first end plate 30 and the second end plate 40 are laminated onto both axial end surfaces of the rotor core 12, so that the rotor core 12 is sandwiched between sets of two end plates 30, 40. The end plate 30, 40 is fixed to the rotor by being press-fitted onto the rotating shaft 115, or, when laminated onto the rotor core 12, by pressing an axial end surface of the end plate in the axial direction by a riveting device to thereby form a rivet portion. Further, the first end plates 30 are disposed opposite both axial end surfaces of the rotor core 12, and the second end plates 40 are laminated onto respective outer sides of the first end plates 30.

[0033] Fig. 3 is a view showing a part of the first end plate 30, viewed from one axial side. Fig. 4 is a perspective drawing of a portion of the rotor 10, viewed from one axial side.

[0034] Below is the first end plate 30 with reference to Fig. 3. The first end plate 30 is a member made of a magnetic material. Specifically, the first end plate 30 is formed by a disc-shaped first steel sheet 31. A shaft hole 31a, through which the rotating shaft 115 extends, is formed in a central portion of the first steel sheet 31. The first steel sheet 31 is made of the same material as the core steel sheet 13 constituting the rotor core 12 and also has the same thickness as the core steel sheet 13. This can reduce the manufacturing cost of the rotor 10, as described below.

[0035] Furthermore, at least one first leakage flux restricting hole is formed in the first end plate 30 in a part opposite the magnet 16. In the embodiment, in the first end plate 30, as the at least one first leakage flux restricting hole (first hole), a first slit 32, 33, which is a hole with a rectangular cross section, is formed per magnet 16 in a part opposite the magnet 16 and the resin portions 18a, 18b arranged at both ends of the magnet 16.

[0036] The first slots 32, 33 are formed in respective parts in the first end plate 30, which are opposite to the same radial side of the magnets 16 in a pair along respective longitudinal directions of the magnets 16. As a result, two first slots 32, 33, which are opposite to the magnets 16 in a pair, are arranged in a pair such that the two first slots 32, 33 in the pair are formed in a V-shape along the arrangement of the magnets 16. Furthermore, respective first slots 32, 33, which are adjacent in the circumferential direction, are formed in a pair at positions located opposite radially opposite sides of their corresponding magnets 16. Fig. 3, the first slots 32 in a right pair are formed in portions opposite the radially inner sides of the magnets 16, and the first slots 33 in a left pair are formed in portions opposite the radially outer sides of the magnets 16. The first slots 32, 33 are formed by punching the first end plate 30 in the axial direction with a punch (not shown) for machining holes.

[0037] Furthermore, an axial end surface of the magnet 16 and axial end surfaces of the resin portions 18a, 18b are overlapped with a portion of the first end plate 30 in which the first slot 32, 33 is not formed. For example, in a portion where the first slot 32 is formed at a position opposite the radially inner side of the magnet 16, the axial end surface of the magnet 16 and the axial end surfaces of the resin portions 18a, 18b are overlapped with a portion of the first end plate 30 that is radially outwardly offset from the first slot 32.

[0038] Furthermore, in a portion where the first slit 33 is formed at a position opposite the radially outer side of the magnet 16, the axial end surface of the magnet 16 and the axial end surfaces of the resin portions 18a, 18b are overlapped with a portion of the first end plate 30 that is radially inwardly offset from the first slit 33. Note that in the following description, the resin portions 18a, 18b may be collectively referred to as the resin portion 18.

[0039] As it is in Fig. 4, the second end plate 40 is a member made of a magnetic material. Specifically, the second end plate 40 is formed by a disc-shaped second steel sheet 41. The second steel sheet 41 is formed of the same material as the core steel sheet 13 constituting the rotor core 12 and the first steel sheet 31 of the first end plate 30, and also has the same thickness. This can reduce the manufacturing cost of the rotor 10, as described later. A shaft hole 41a through which the rotary shaft 115 extends is formed in a central part of the second steel sheet 41.

[0040] In a state where the second end plate 40 is laminated to the first end plate 30 and the rotor core 12, at least one second leakage flux restricting hole is formed at a position that overlaps the magnet 16 when viewed from one axial side. In the embodiment, in the second end plate 40, as the at least one second leakage flux restricting hole (second hole), a second slit 42, 43, which is a hole having an elongated rectangular cross section, is formed per magnet 16 in a part opposite the magnet 16 and the resin portions 18 arranged on both ends of the magnet 16. In Fig. 4, the second slot 42, 43 formed in the second end plate 40 and shown on an outer side is represented by a rectangle in thick line, and the first slot 32, 33 formed in the first end plate 30 and shown on an inner side so as to be covered by the second end plate 40 is represented by a rectangle in thin line.

[0041] In the present embodiment, the first steel sheet 31 constituting the first end plate 30 and the second steel sheet 41 constituting the second end plate 40 have the same shape. Specifically, the second end plate 40 has the same external shape as the first end plate 30, and a shape and formation position of the slit 42, 43 in the second end plate 40 are the same as those of the slit 32, 33 in the first end plate 30. In a state where two end plates 30, 40 are laminated, circumferential phases of the end plates 30, 40 are offset from each other, so that the second slit 42, 43 and the magnet 16 are arranged on opposite sides of the first slit 32, 33. As a result, in a state where the first end plate and the second end plate 40 are laminated, as shown in Fig. 4, the slots 32, 33, 42, 43 are formed on radially opposite sides of the magnets 16 at positions facing the respective pair of magnets 16. In this state, when the rotor 10 is viewed from the one axial side, respective intermediate parts of the first slot 32, 33 and the second slot 42, 43 in the circumferential direction overlap with the magnet 16 within the magnet hole 14. Further, when the rotor 10 is viewed from the one axial side, all of the first slots 32, 33 and the second slots 42, 43 are arranged at different positions. Furthermore, when the rotor 10 is viewed from the one axial side, both circumferential ends of the first slot 32, 33 and both circumferential ends of the second slot 42, 43 overlap with the resin portions 18a, 18b within the magnet hole 14.Furthermore, when the rotor 10 is viewed from one axial side, in parts where the first slots 32, 33 and the second slots 42, 43 overlap with the resin portions 18, the first slots 32, 33 and the second slots 42, 43 are arranged at different positions.

[0042] In the rotor 10, the first slot 32, 33 in the first end plate 30 is formed of a magnetic material so as to oppose the magnet 16 within the magnet hole 14. This creates a space with a large magnetic resistance in the first slot 32, 33 of the first end plate 30, so that magnetic fluxes can hardly flow into the end plate 30. Therefore, it is possible to restrict magnetic flux leakage from the magnet 16 to the first end plate 30 and to prevent magnetic flux short-circuiting of the magnet 16 by the first end plate 30. Furthermore, the first end plate 30 overlaps the axial end surface of the magnet 16. This eliminates the need to use a non-magnetic substance for the end plate 30, and makes it possible to compensate for the limitation of the magnetic flux leakage of the magnet 16 by limiting the protrusion of the magnet 16.

[0043] Furthermore, the second end plate 40 is laminated to the outer side of the first end plate 30 such that the first slots 32, 33 and the second slots 42, 43 are all located at different positions when viewed from one axial side. Therefore, by covering the first slots 32, 33 with the second end plate 40, it is possible to limit exposure of the magnets 16. Furthermore, this can improve the protrusion-preventing performance of the magnets 16. Furthermore, the first steel sheet 31 and the second steel sheet 41, which are formed of the same material as the core steel sheet 13 constituting the rotor core, are used for the end plates 30, 40, making it possible to reduce the manufacturing cost. Furthermore, the first steel sheet 31 and the second steel sheet 41 have the same shape and are laminated with different phases in the circumferential direction, thereby making it possible to further limit the increase in manufacturing costs.As a result, it is possible to limit manufacturing costs, limit magnetic flux leakage and short-circuiting of the magnets 16, and improve the protrusion prevention performance of the magnets 16. Since magnetic flux leakage and short-circuiting can be limited, more magnetic flux can flow from the magnets 16 toward the stator. This makes it possible to limit torque reduction and loss increase in the rotating electric machine 100.

[0044] Furthermore, when the rotor 10 is viewed from one axial side, the first slots 32, 33 and the second slots 42, 43 overlap with the resin portions 18. Furthermore, when the rotor 10 is viewed from one axial side, in parts where the first slots 32, 33 and the second slots 42, 43 overlap with the resin portions 18, the first slots 32, 33 and the second slots 42, 43 are arranged at different positions. This makes it possible to compensate for the limitation of leakage fluxes flowing through parts opposite to the resin portions 18 in the first end plate 30 and the second end plate 40 by limiting the protrusion of the resin due to cracks in the resin portions 18.

[0045] In a case where the end plate 30 does not face the resin portions 18, if the resin in the resin portions 18 ever cracks, some resin may protrude from it. In this embodiment, it is possible to limit resin protrusion even if the resin cracks.

[0046] Fig. 5 is a sectional view along the line BB in Fig. 4 to describe that a magnetic flux leakage can be limited in the rotor 10 of the embodiment. In the rotor 10 of the embodiment, the first slot 32 of the first end plate 30 and the second slot 42 of the second end plate 40 are, as viewed from one side in the axial direction (a left-right direction in Fig. 5), arranged at different positions. This allows, as indicated by an arrow α in Fig. As shown in Figure 5, even in a case where part of the magnetic flux emanating from the N pole of the magnet 16 tends to leak to the first end plate 30 side, the presence of the first slot 32 can limit leakage flux directed from the radially outer side to the radially inner side. This makes it possible to limit magnetic flux short-circuiting through the first end plate 30 of the magnetic flux of the magnet 16.

[0047] Furthermore, Fig. 6 a view corresponding to the section along the line BB in Fig. 4 to describe that a magnetic flux leakage occurs in a rotor 10a as a comparative example. In the comparative example of Fig. 6, a second end plate 40a is laminated to an outer side of a first end plate 30 having a first slot 32. The second end plate 40a has a shaft hole (not shown) in a central part through which a rotary shaft 115 extends, and has no other through holes extending in the axial direction, including the second slot 42 ( Fig. 5). For such a comparative example, a case is discussed below in which a part of the magnetic fluxes emanating from an N-pole of a magnet 16 tends to leak to the side of the first end plate 30, as shown by an arrow β in Fig. 6. In this case, a magnetic flux exiting from a radially outer side of the first slot 32 of the first end plate 30 bypasses the first slot 32 via the second end plate 40a located on an axially outer side, so as to be directed toward a radially inner side of the first end plate 30. This reduces a limiting effect of a magnetic flux short circuit by the first end plate on the magnetic fluxes of the magnet. The present embodiment can prevent such a disadvantage.

[0048] It should be noted that, in the above embodiment, when the rotor 10 is viewed from the one axial side, the first slots 32, 33 of the first end plate 30 and the second slots 42, 43 of the second end plate 40 are all arranged at different positions. However, when the rotor 10 is viewed from the one axial side, only some of the first slots and the second slots may be arranged at different positions. In this configuration, since the other first slots and the other second slots are arranged to overlap in the axial direction, some magnets 16 are exposed to the outside through such overlapping parts. Furthermore, in this configuration, when the rotor is viewed from the one axial side, it is possible to limit exposure of the magnets compared to the case where the first slots and the second slots overlap.Thus, this configuration can also improve the anti-jumping performance of magnets.

[0049] Furthermore, in the above embodiment, when the rotor 10 is viewed from one axial side, the slots in the end plates 30, 40 may be formed in portions overlapping only the magnets 16 and not both the magnets 16 and the resin portions 18. In this case, an effect of the end plates for limiting leakage of a magnetic flux flowing in portions opposite the resin portions 18 is small, but an effect for limiting the protrusion of the resin portions 18 can be enhanced.

[0050] Fig. 7 is a view showing a part in the circumferential direction of a first end plate 30 according to another example of the embodiment, viewed from the one axial side. Fig. 8 is a view showing another (different from the part in Fig. 7 different) part in the circumferential direction of the first end plate 30 according to another example of the embodiment viewed from the one axial side. Fig. 9A is a view showing a part of a rotor 10b of another example of the embodiment viewed from one axial side, namely the part having the same circumferential phase as in Fig. 7. Fig. Fig. 9B is a view seen from one axial side of a part of the rotor 10b of another example, namely the part having the same circumferential phase as in Fig. 8.

[0051] In a configuration of this example, as shown in Fig. 7, viewed from one axial side, a plurality of first slots 32a, 32b, 33a, 33b are formed in the first end plate 30 in parts that overlap with magnets 16 and resin portions 18 on both sides. The first slots 32a, 32b, 33a, 33b are formed in respective parts that are opposite in the radial direction to opposite sides of two magnets 16 arranged in the same pair along respective longitudinal directions of the magnets 16. In a part in the circumferential direction of the first end plate 30, as shown in Fig. 7, the first slot 32a on the right side in Fig. 7 of the slots 32a, 32b arranged in a pair in a part opposite a radially outer side of the magnet 16. The first slot 32b on the left side in Fig. 7 is formed in a part opposite to a radially inner side of the magnet 16.

[0052] Furthermore, as stated in Fig. 8, from the slots 33a, 33b, which are located at opposite Fig. 7 other circumferential position than one to the slots 32a, 32b in Fig. 7 are arranged in a circumferentially adjacent pair, the first slot 33a on the right side in Fig. 8 in a part opposite a radially inner side of the magnet 16. The first slot 33b on the left side in Fig. 8 is formed in a part opposite to a radially outer side of the magnet 16.

[0053] As a result, two first slots 32a, 32b, 33a, 33b are arranged in a pair opposite a pair of magnets 16, and the two first slots 32a, 32b, 33a, 33b in each pair are formed in a V-shape along the arrangement of the magnets 16. In the first end plate 30, pairs of two first slots 32a, 32b and pairs of two first slots 33a, 33b are arranged alternately in the circumferential direction.

[0054] Furthermore, a second end plate 40 is laminated to an outer side of the first end plate 30. As shown in the Fig. 9A, Fig. 9B, a plurality of second slots 42a, 42b, 43a, 43b are formed in the second end plate 40 in parts that overlap with the magnets 16 and the resin portions 18 on both sides as viewed from one axial side. Fig. 9A, Fig. In Fig. 9B, the second slots 42a, 42b, 43a, 43b are represented by a rectangle drawn with a thick line, while the first slots 32a, 32b, 33a, 33b are represented by a rectangle drawn with a thin line. The second slots 42a, 42b, 43a, 43b are formed in respective portions opposite to opposite sides of the magnets 16 belonging to the same pair in the radial direction, along respective longitudinal directions of the magnets 16. Fig. 9A shows a part of the second end plate 40 having the same phase as a peripheral part of the Fig. 7 shown first end plate 30. Fig. 9B shows a part of the second end plate 40 having the same phase as a peripheral part of the Fig. 8 shown first end plate 30. As shown in Fig. 9A, in a peripheral part of the second end plate 40, the second slot 42a is formed on the right side in Fig. 9A in a part opposite to a radially inner side of the magnet 16. Further, the second slot 42b on the left side is formed in Fig. 9A in a part opposite to a radially outer side of the magnet 16.

[0055] As it is in Fig. 9B, further, in a peripheral part of the second end plate 40, the second slot 43a is formed on the right side in Fig. 9B in a part opposite to a radially outer side of the magnet 16. Furthermore, the second slot 43b on the left side is formed in Fig. 9B in a part opposite to a radially inner side of the magnet 16.

[0056] Furthermore, when the rotor 10b is viewed from one axial side, respective parts of the magnets and the resin portions to which the first slots 32a, 32b, 33a, 33b of the first end plate 30 and the second slots 42a, 42b, 43a, 43b of the second end plate 40 are opposed are all different from each other. Furthermore, in the example of Fig. 9A and Fig. 9B, the first slot and the second slot are partially located in a portion opposite to a portion (e.g., an intermediate bridge B1 or the like) of the rotor core other than the magnets 16 and the resin portions 18, as viewed from one axial side. Even if an overlap portion exists between the first slot and the second slot in this portion, this does not affect the projection limitation of the magnets and the resin portions. Furthermore, the overlap portion can further limit magnetic flux leakage.

[0057] Furthermore, in the configuration of this example, a first steel sheet 31 constituting the first end plate 30 and a second steel sheet 41 constituting the second end plate 40 have the same shape. For this reason, the second end plate 40 has the same external shape as the first end plate 30, and the shape and formation position of the second slots 42a, 42b, 43a, 43b are also the same as those of the first slots 32a, 32b, 33a, 33b of the first end plate 30. In a state where the two end plates 30, 40 are laminated, circumferential phases of the end plates 30, 40 are offset from each other, so that the second slot and the magnet 16 are formed on opposite sides of the first slot.

[0058] In this configuration you also get an effect similar to that in the configuration of the Fig. 1 to 5. Other configurations and effects are the same as in the configuration of the Fig. 1 to 5.

[0059] Fig. Fig. 10 is a view, viewed from an axial side, showing a part of a rotor 10c of another example of the embodiment, and Fig. 9A. In one configuration of this example, in addition to the configuration of the Fig. 7 to 9B, when the rotor 10c is viewed from one axial side, a first slot 32a, 32b of the first end plate 30 and a second slot 42a, 42b of the second end plate 40 partially for each magnet 16. In Fig. 10, a portion where the first slot and the second slot overlap is represented by a section marked with an oblique grid. Accordingly, the magnet 16 is exposed in the section marked with an oblique grid. In such a configuration, the magnet 16 is partially exposed to the outside. However, it is possible to limit exposure of the magnets 16 compared to a case where, viewed from one axial side, the first slots and the second slots completely overlap each other. Furthermore, in this case, it is possible to further limit magnetic flux leakage and magnetic flux short-circuit. Other configurations and effects are the same as those in the configuration of Fig. 7 to 9B.

[0060] Fig. 11 is a view showing a part in a circumferential direction of a first end plate 30 according to another example of the embodiment, viewed from the one axial side. Fig. 12 is an enlarged view of part C in Fig. 11. Fig. 13 is a view showing another (different from the part in Fig. 11 different) part in the circumferential direction of the first end plate 30 according to another example of the embodiment, viewed from one axial side. An upper drawing of Fig. Fig. 14 is a view showing a part of a rotor 10d of another example of the embodiment viewed from an axial side, and a bottom drawing of Fig. 14 is an enlarged view of part D in the upper drawing of Fig. 14.

[0061] In a configuration of this example, no slot is formed in the end plates 30, 40. Instead, in this example, a plurality of first pin holes 36 are formed in a part opposite a magnet 16 in the first end plate 30 as at least one first leakage flux limiting hole. Furthermore, a plurality of first pin holes 46 ( Fig. 14) in a part opposite to a magnet 16 in the second end plate 40, as at least one second leakage flux limiting hole.

[0062] In particular, as stated in the Fig. 11, Fig. 13, a first V-shaped hole group 34a and a second V-shaped hole group 34b are formed at a plurality of positions in the circumferential direction of the first end plate 30. In the Fig. 11, two pin hole groups 35a, 35b are arranged in a V-shape along an arrangement position of the V-shaped magnet holes 14 ( Fig. 2) of the rotor core 12. In the Fig. In the second V-shaped hole group 34b shown in FIG. 13, two pin hole groups 35c, 35d are arranged in a V shape along an arrangement position of the V-shaped magnet holes 14 of the rotor core 12. In the following description, the pin hole groups 35a, 35b, 35c, 35d may be collectively referred to as the pin hole group 35. In the pin hole group 35, a plurality of pin holes are arranged as minute circular holes in a rectangular area. Specifically, the pin hole group 35 includes a plurality of first pin holes 36, a plurality of second pin holes 37, and a plurality of third pin holes 38. The plurality of first pin holes 36 are formed in a part opposite to the magnet 16 in the first end plate 30 at an intermediate part in the longitudinal direction of the pin hole group 35.The plurality of second pin holes 37 are formed in a portion opposite to at least one of the plurality of resin portions 18a, 18b in the first end plate 30 at one longitudinal end of the pin hole group 35. The plurality of third pin holes 38 are formed in a portion not opposite to the magnet 16 and the resin portions 18a, 18b in the first end plate 30 at the longitudinal end of the pin hole group 35. In the embodiment, the first pin hole 36 corresponds to a first leakage flux restricting hole, and the second pin hole 37 corresponds to a third leakage flux restricting hole (third hole).

[0063] The plurality of pin holes 36, 37, 38 constituting the pin hole group 35 are arranged such that some of them are generally aligned at regular intervals in the longitudinal direction of the pin hole group 35 and in the width direction perpendicular to the longitudinal direction. The pin holes 36, 37, 38 extend through the first end plate 30 in the axial direction, and all of the pin holes 36, 37, 38 have the same diameter. As a result, a part of the end plate 30 in which the pin holes 36, 37, 38 are formed has a mesh shape. The pin holes 36, 37, 38 are formed such that the end plate 30 is punched at a plurality of positions in the axial direction using a punch (not shown) to produce a plurality of holes.

[0064] In the first end plate 30, the first V-shaped hole groups 34a and the second V-shaped hole groups 34b are arranged alternately in the circumferential direction. Respective adjacent pin holes 36, 37, 38 in the V-shaped hole groups 34a, 34b are arranged at different positions in the longitudinal direction of the magnet hole 14. Fig. The first V-shaped hole group 34a shown in Figure 11 is compared to the one shown in Fig. 13 shown second V-shaped hole group 34b relative to the magnet hole 14 by generally half a pin hole pitch in the direction of one long side (the left side in Fig. 11, Fig. 13), which is a circumferential side.

[0065] Furthermore, an axial end surface of the magnet 16 and axial end surfaces of the resin portions 18a, 18b are covered by parts of the first end plate 30 where the pin holes 36, 37, 38 are not formed.

[0066] As it is in Fig. As shown in Fig. 12, in the pin-hole group 35, an inter-hole magnetic flux path 39 is formed between adjacent pin-holes 36, 37, 38. The inter-hole magnetic flux path 39 is a path through which a leakage flux leaking from the magnet 16 to the first end plate 30 side could flow during operation.

[0067] Similar to the first end plate 30, first V-shaped hole groups 34c and second V-shaped hole groups (not shown) are formed at multiple positions in the circumferential direction of the second end plate 40 (see Fig. 14) that the first V-shaped hole groups 34c and the second V-shaped hole groups are arranged alternately in the circumferential direction. Fig. 14 shows a part of the second end plate 40 having the same circumferential phase as a circumferential part of the Fig. 11. The first V-shaped hole group 34c of the second end plate 40 includes a plurality of first pin holes 46, a plurality of second pin holes 47, and a plurality of third pin holes 48. The first pin hole 46 corresponds to a second leakage flux limiting hole, and the second pin hole 47 corresponds to a fourth leakage flux limiting hole (fourth hole). Fig. 14, the pin hole 46, 47, 48 is shown by a black circle. In Fig. 14B, the pin hole 46, 47, 48 is shown by a circle in an oblique grid.

[0068] In a configuration of this example, a first steel sheet 31 forming the first end plate 30 and a second steel sheet 41 forming the second end plate 40 have the same shape, and shapes and formation positions of the pin holes are also the same in the first steel sheet 31 and the second steel sheet 41. In the second end plate 40, an arrangement position of the Fig. 14 shown first V-shaped hole group 34c relative to the magnet hole 14 is the same as that of the Fig. 13 shown second V-shaped hole group 34b in the first end plate 30. In the second end plate 40, an arrangement position of the second V-shaped hole group (not shown) relative to the magnet hole is the same as that of the second V-shaped hole group 34b shown in Fig. 11 shown first V-shaped hole group 34a in the first end plate 30.

[0069] The end plates 30, 40 are arranged to have different phases in the circumferential direction, so that respective first V-shaped hole groups 34a, 34c are arranged at the same circumferential position and respective second V-shaped hole groups 34b are arranged at the same circumferential position in a state where the two end plates 30, 40 are laminated. In this state, when the rotor is viewed from the one axial side, the pin holes in the V-shaped hole groups 34a, 34b, 34c of the first end plate 30 and the second end plate 40 are located at different positions. Furthermore, when the rotor is viewed from the one axial side, the plurality of first pin holes 36, 46 of the first end plate 30 and the second end plate 40 overlap with the magnet 16.Furthermore, when the rotor is viewed from one axial side, at least some of the first pin holes 36 in the first end plate 30 are arranged at different positions than the first pin holes 46 in the second end plate 40.

[0070] Furthermore, when the rotor is viewed from the one axial side, the plurality of second pin holes 37, 47 in the end plates 30, 40 overlap with the resin portions 18. Furthermore, when the rotor is viewed from the one axial side, at least some of the second pin holes 37 in the first end plate 30 are arranged at different positions from those of the second pin holes 47 in the second end plate 40.

[0071] In the configuration described above, the first pin holes 36 in the first end plate 30 oppose the magnet 16, forming a space with a large magnetic resistance in the first pin holes 36 of the first end plate 30, making it difficult for magnetic flux to flow through the first end plate 30. This makes it possible to limit magnetic flux leakage and magnetic flux short-circuiting. Furthermore, it is not necessary to use a non-magnetic substance for the first end plate 30, and it is possible to balance the limitation of the magnetic flux leakage of the magnet 16 with the limitation of the protrusion of the magnet 16.

[0072] Furthermore, in the first end plate 30, the plurality of first pin holes 36 are formed in a part opposite to the magnet 16. This makes it possible to increase a ratio of the first pin holes 36 in a unit area of ​​the first end plate 30, and further, when each first pin hole 36 is small, it is possible to increase the total number of first pin holes 36. This can increase the number of spaces formed in the part opposite to the magnet, which can very well balance the limitation of magnetic flux leakage with the protrusion limitation of the magnet 16. Furthermore, since the first pin hole 36 is a circular hole, the size of the first pin hole 36 can be easily reduced.

[0073] Furthermore, the plurality of second pin holes 37 are formed in the first end plate 30 in a part opposite to the resin portion 18. This makes it possible to increase a ratio of the second pin holes 37 in a unit area of ​​the first end plate 30, and further, when each second pin hole 37 is small, it is possible to increase the total number of second pin holes 37. This makes it possible to balance a limitation of a leakage flow flowing through the part opposite to the resin portion 18 in the first end plate 30 with a protrusion limitation of the resin due to a crack of the resin portion 18.

[0074] Note that the above description refers to a case where the pin hole 36, 37, 38, 46, 47, 48 is a circular hole. However, the pin hole may also be a non-circular hole, such as a rectangular hole.

[0075] Furthermore, in the embodiment, with respect to the plurality of pin holes 36, 37, 38, 46, 47, 48 in the end plates 30, 40, a pin hole pitch d ( Fig. 12), which corresponds to a width of the inter-hole magnetic flux path 39, should be small. This makes it possible to limit magnetic flux leakage and magnetic flux short-circuiting in which a magnetic flux is short-circuited through the inter-hole magnetic flux path 39 without passing through the stator 110 ( Fig. 1). It is advantageous to limit the pinhole pitch d to a predetermined range that is two to six times the thickness of the first steel sheet 31 constituting the end plate 30. By limiting the pinhole pitch d to no more than six times the thickness of the first steel sheet 31, it is possible to greatly reduce a magnetic property of the end plate 30 in the inter-hole magnetic flux path 39 in a case where the pinholes 36, 37, 38 are formed by punching. This makes it difficult for the leakage flux to pass through the inter-hole magnetic flux path 39, thereby further limiting the magnetic flux short circuit.

[0076] Fig. Fig. 15 is a BH characteristic showing a relationship between a magnetic field H and a magnetic flux density B in an ordinary electromagnetic steel sheet and a BH characteristic of the first steel sheet 31, which is a magnetic steel sheet, in the inter-hole magnetic flux path 39 when the pin hole pitch d is limited to the range predetermined as above in the embodiment. As shown in Fig. As shown in Fig. 15, the BH characteristic is a relationship between a magnetic field H and a magnetic flux density B in a steel sheet magnetized by the magnetic field H. Compared with the BH characteristic of the ordinary electromagnetic steel sheet, the BH characteristic in the embodiment when the pinhole pitch d is limited to the predetermined range shows that, especially in a small magnetic field region, an increase in the magnetic flux density B relative to an increase in the magnetic field H is moderate, and a magnetic permeability is low. Therefore, it was found that by limiting the pinhole pitch d to the predetermined range, the magnetic flux short-circuiting limitation effect can be enhanced.

[0077] Furthermore, by setting the pin hole pitch d to not less than twice the thickness of the first steel sheet 31, it is possible to sufficiently increase the shape accuracy of the pin holes 36, 37, 38. The above description refers to the first steel sheet 31 for forming the first end plate 30. However, it is also applicable to the second steel sheet 41 forming the second end plate 40.

[0078] Fig. Fig. 16 is a view of a part in the circumferential direction, viewed from one axial side, of a first end plate 30 according to another example of the embodiment. In a configuration of this example, a diameter that is a maximum inner length of a first pin hole 36a in a first V-shaped hole group 34d in the first end plate 30 is smaller than that shown in Figs. Fig. 11 to 14. A diameter that is a maximum inner length of a second pin hole 37a is smaller than the diameter of the first pin hole 36a. In the configuration of Fig. 16 is a third pin hole 38 (see Fig. 11) is omitted, but the third pin hole may be present.

[0079] Furthermore, in the first end plate 30, a distance between the first pin holes 36a arranged side by side in the pin hole group 35e, 35f in a longitudinal direction L1 of a magnet hole is greater than a distance between the second pin holes 37a arranged side by side in the pin hole group 35e, 35f in the longitudinal direction L1.

[0080] Further, the plurality of first pin holes 36a are arranged in a zigzag shape. Specifically, the plurality of first pin holes 36a are arranged on a straight line in the longitudinal direction L1 in a rectangular area (a region defined by an oblique grid in Fig. 16) facing an axial end surface of the magnet 16, along a shape of the axial end surface so as to form a pin hole set C1, C2, C3. A plurality of pin hole sets C1, C2, C3 are arranged in a plurality of rows and divided in a direction perpendicular to the longitudinal direction L1. In the pin hole set C1, C2, C3, the plurality of first pin holes 36a are generally arranged at regular intervals. Further, the plurality of pin hole sets C1, C2, C3 are designed such that respective positions of respective first pin holes 36a in adjacent pin hole sets C1, C2, C3 deviate from each other along the longitudinal direction L1. For example, the plurality of pin hole sets C1, C2, C3 are designed such that respective positions of respective first pin holes 36a in adjacent pin hole sets C1, C2, C3 deviate from each other along the longitudinal direction L1 generally by half a pitch.As a result, the plurality of first pin holes 36a are arranged in a zigzag shape.

[0081] Furthermore, a plurality of second pin holes 37a located at the outer diameter-side ends of the pin hole group 35e, 35f are arranged such that a plurality of pin hole sets D1, D2, D3 are arranged in one direction of the plurality of pin hole sets C1, C2, C3. Furthermore, the respective positions of respective second pin holes 37a in adjacent pin hole sets D1, D2, D3 differ from each other along the longitudinal direction L1.

[0082] Fig. 16 shows the first V-shaped hole group 34d in a peripheral part of the first end plate 30. However, a second V-shaped hole group (not shown) is formed alternately with the first V-shaped hole group 34d so that positions of pin holes deviate to one side in the longitudinal direction of the magnet hole. In the second V-shaped hole group, the shape and arrangement of the pin holes deviating therefrom are similar to the first V-shaped hole group 34d in Fig. 16.

[0083] Furthermore, similar to the first end plate 30, a first V-shaped hole group and a second V-shaped hole group are formed in the second end plate (not shown). A first steel sheet 31 constituting the first end plate 30 and a second steel sheet constituting the second end plate have the same shape, and the shapes and formation positions of the pin holes in the first steel sheet 31 and the second steel sheet are also the same. In the second end plate, an arrangement position of the first V-shaped hole group relative to the magnet hole is the same as that in the second V-shaped hole group in the first end plate 30. In the second end plate, an arrangement position of the second V-shaped hole group relative to the magnet hole is the same as that in the first V-shaped hole group 34d in the first end plate 30.The two end plates 30, 40 have different phases in the circumferential direction, so that in a state where the end plates 30, 40 are laminated, respective first V-shaped hole groups 34d are arranged at the same circumferential position and respective second V-shaped hole groups are arranged at the same circumferential position.

[0084] With this configuration, it is possible to limit the resin protrusion due to cracking of the resin portion 18, and further limit the number of punches required to machine holes of the first pin holes 36a and limit magnetic flux leakage. Furthermore, in a configuration where the end plate 30 does not face the resin portion 18, unlike the configuration of the examples, if the resin cracks, a small piece of the resin may protrude from the magnet hole 14. For this reason, in view of limiting the resin protrusion, it is advantageous to form the second pin holes 37a in the part of the first end plate 30 opposite the resin portion 18 as small as possible. Furthermore, there is a low probability that the magnet 16 will protrude from the resin portion 18 due to a crack.As a result, in view of limiting the protrusion of the magnet 16, the first pin hole 36a facing the magnet 16 can be made relatively large, assuming that a shape of the axial end surface of the magnet 16 is smaller. Furthermore, since the first pin hole 36a can be made relatively large, it is possible to limit the number of punches for machining the first pin holes 36a while ensuring a necessary ratio of the first pin hole 36a per unit area to thereby limit magnetic flux leakage. This makes it possible to reduce the manufacturing cost of the end plate 30.

[0085] Furthermore, in the first end plate 30, the distance between the first pin holes 36a, 35f adjacent in the longitudinal direction L1 of the magnet hole in the pin hole group 35e is greater than the distance between the second pin holes 37a adjacent in the longitudinal direction of the magnet hole in the pin hole group 35e, 35f. This makes it possible to increase the strength of a part of the first end plate 30 that is opposite to the magnet 16 and can be pressed by the magnet 16, and to increase a limiting effect of the magnetic flux leakage in a part that is opposite to the resin portion 18 and does not require high strength. Other configurations and effects are the same as in the configuration of the Fig. 11 to 15. It should be noted that in the end plate 30, the distance between the first pin holes 36a in the pin hole group 35e, 35f adjacent in a direction perpendicular to the longitudinal direction L1 can be made larger than a distance between the second pin holes 37a adjacent in the direction perpendicular to the longitudinal direction L1 in the pin hole group 35e, 35f. Furthermore, in the configuration of Fig. 16, only either the configuration in which the diameter of the second pin hole 37a is smaller than the diameter of the first pin hole 36a, or the configuration in which the distance between the first pin holes 36a is greater than the distance between the second pin holes 37a may be used.

[0086] Furthermore, the configuration of Fig. 16, the plurality of first pin holes 36a are arranged in a zigzag pattern. This makes it possible to further reduce the distance between the first pin holes 36a in adjacent pin hole sets C1, C2, C3. For this reason, the pin hole distance between the first pin holes 36a can be easily limited to the range of two to six times the thickness of the first steel sheet 31. Accordingly, in a case where the first pin holes 36a are formed by punching, the magnetic properties between the first pin holes 36a can be easily reduced. Furthermore, in the first end plate 30, as shown by an arrow γ in Fig. As shown in Figure 16, a flux leakage path between the plurality of first pin holes 36a is a non-linear path bent at a plurality of bending portions. This allows the length of the flux leakage path between the plurality of first pin holes 36a to be increased in the first end plate 30. This makes it possible to further limit the occurrence of magnetic flux short-circuiting through the first end plate 30, thereby making it possible to limit a torque reduction and an increase in loss of the rotary electric machine.

[0087] Furthermore, since the plurality of second pin holes 37a positioned at outer diameter-side ends of the pin hole group 35e, 35f are also arranged in a zigzag pattern, the distance between adjacent second pin holes 37a can be reduced similarly to the first pin holes 36a. This makes it possible to easily reduce the magnetic properties between the second pin holes 37a and increase the length of a flux leakage path, thereby making it possible to further limit the occurrence of magnetic flux short circuit through the end plate 30. Other configurations and effects are the same as in the Fig. 11 to 15. Note that in the configuration of this example, the first pin holes and the second pin holes can have the same size and pitch.

[0088] The upper drawing of Fig. 17 is a perspective drawing according to another example of the embodiment of a part in the circumferential direction in a state in which a second end plate 40 is removed from a rotor, viewed from the one axial side, and the lower drawing of Fig. 17 is an enlarged view of part E of the upper drawing of Fig. 17. Fig. 18 is a view according to another example of the embodiment of another (from the part in Fig. 17 different) part in the circumferential direction of a first end plate 30, viewed from one axial side. Fig. 19 is a perspective drawing of a part of a rotor 10e according to another example of the embodiment, viewed from one axial side.

[0089] Unlike the configurations of the above examples, in a configuration of this example, a plurality of first slots 50 are formed as elongated holes in the Fig. 17, Fig. 18 shown first end plate 30 as a plurality of first leakage flux limiting holes. Furthermore, in the Fig. 19, a plurality of second slots 60 are formed as a plurality of second flux leakage restricting holes. Specifically, first V-shaped hole groups 51 and second V-shaped hole groups 53 are formed at a plurality of positions in the circumferential direction of the first end plate 30. The first V-shaped hole groups 51 and the second V-shaped hole groups 53 are arranged alternately in the circumferential direction of the first end plate 30. Fig. 17 shows the first V-shaped hole group 51 of the first end plate 30, and Fig. 18 shows the second V-shaped hole group 53 of the first end plate 30. In each of the V-shaped hole groups 51, 53, two slot groups 52, 54 are formed in a V-shape along an arrangement position of the V-shaped magnet holes 14 of the rotor core 12 ( Fig. 2). The slot group 52, 54 includes a plurality of first slots 50, and the first slots 50 are formed in a portion opposite a magnet 16 in the first end plate 30.

[0090] In the slot group 52, 54, the plurality of slots 50 are arranged on a straight line in a longitudinal direction L2 so as to form a slot set E1, E2 ... E6. The plurality of slot sets E1, E2, ... E6 are arranged in a divided manner in multiple rows in a direction perpendicular to the longitudinal direction L2, and positions of adjacent slot sets E1, E2, ... E6 are different from each other in the longitudinal direction of the slot 50. Thereby, in the respective slot sets E1, E2, ... E6, flow paths T are formed between slots 50 adjacent in the longitudinal direction L2 so that the flow paths T between adjacent slot sets E1, E2, ... E6 are located at different positions with respect to a direction parallel to a straight line where the slots 50 are positioned. A distance of the flow path T between the slots 50 in the longitudinal direction L2 is generally the same.Further, some of the plurality of slots 50 are also arranged in portions opposite to the resin portions 18 in the end plate 30. The slots 50 may be formed by punching using a punch for machining holes.

[0091] Furthermore, the Fig. 17 shown first V-shaped hole group 51 and the one in Fig. 18 shown second V-shaped hole group 53 in the positions of the slots 50 in the longitudinal direction L2 in each slot group different from each other.

[0092] Further, similarly to the first end plate 30, first V-shaped hole groups 61 and second V-shaped hole groups (not shown) are formed in the second end plate 40 at a plurality of positions in the circumferential direction such that the first V-shaped hole groups 61 and the second V-shaped hole groups are arranged alternately in the circumferential direction. Fig. 19 shows a part of the second end plate 40 having the same circumferential phase as a circumferential part of the Fig. 17 shown first end plate 30. The first V-shaped hole group 61 of the second end plate 40 comprises two slot groups 62, and each of the slot groups 62 comprises a plurality of second slots 60. In Fig. 19, the second slots 60 formed in the second end plate 40 are represented by a rectangle in thick line, and the first slots 50 formed in the first end plate 30 are represented by a rectangle in thin line.

[0093] A first steel sheet 31 constituting the first end plate 30 and a second steel sheet 41 constituting the second end plate 40 have the same shape, and shapes and formation positions of the slits are also the same as those in the first steel sheet 31 and the second steel sheet 41. In the second end plate 40, an arrangement position of the first V-shaped hole group 61 relative to the magnet hole is the same as that of the second V-shaped hole group 53 in the first end plate 30. In the second end plate 40, an arrangement position of the second V-shaped hole group (not shown) relative to the magnet hole is the same as that of the first V-shaped hole group 51 in the first end plate 30.Two end plates 30, 40 are arranged in a state where the two end plates 30, 40 are laminated to have different phases in the circumferential direction so that respective first V-shaped hole groups 51, 61 are arranged at the same circumferential position and respective second V-shaped hole groups 53 are arranged at the same circumferential position. In this state, the first end plate 30 and the second end plate 40 have different formation positions of the slots 50, 60 in the V-shaped hole groups 51, 61, 53. As a result, when the rotor is viewed from the one axial side, the plurality of slots 50, 60 in the end plates 30, 40 overlap with the magnet 16. Furthermore, when the rotor is viewed from the one axial side, at least some of the slots 50 in the first end plate 30 are arranged at positions different from those of the slots 60 in the second end plate 40. In . Fig. In FIG. 19, a portion where the slots 50, 60 of the first end plate 30 and the second end plate 40 overlap when the rotor is viewed from one axial side is represented by a slanted lattice portion. Furthermore, in a portion where the slots 50, 60 in the end plates 30, 40 overlap with the resin portion 18 when the rotor is viewed from one axial side, the first slots 50 in the first end plate 30 are arranged at positions different from those of the second slots 60 in the second end plate 40.

[0094] In this configuration, it is possible to limit magnetic flux leakage and magnetic flux short-circuit of the magnets 16, similar to the configurations in the above examples. Furthermore, the effect of limiting the protrusion of the magnets 16 and the resin can be improved.

[0095] Furthermore, as indicated by a dashed arrow in Fig. As shown in Figure 17, when a leakage flux passes between the plurality of first slots 50 of the first end plate 30, a path of the magnetic flux is obstructed by the first slot 50 on a front side in the propagation direction of the magnetic flux, so that the magnetic flux ends. This lengthens a flux leakage path and thereby enables more effective limitation of the magnetic flux short circuit. The same effect can be obtained by the second slots 60 of the second end plate 40. Other configurations and effects are the same as in the configuration of Fig. 1 to 5.

[0096] It should be noted that the configurations refer to examples in a case where the first end plate 30 and the second end plate 40 are laminated in a state where their respective phases in the circumferential direction are different from each other. Further, the first end plate and the second end plate may be laminated in a state where their front and back sides are arranged upside down, that is, they are reversely laminated. For example, in the embodiment shown in the Fig. 7 to 9B shown configuration in the first end plate 30 which in Fig. 7, the V-shaped arrangement of the slots 32a, 32b may be formed at several positions in the circumferential direction. Then, a V-shaped arrangement similar to that shown in Fig. 8 shown V-shaped arrangement of the slots 33a, 33b at several positions in the circumferential direction. The V-shaped arrangements of the slots 32a, 32b, 33a, 33b of the Fig. 7 and Fig. 8 correspond to each other in a state in which the first end plate 30 is arranged inverted. For this reason, steel sheets having the same shape are used for a first steel sheet constituting the first end plate and a second steel sheet constituting the second end plate, so that they are laminated in a state in which their front and back sides are arranged inverted. As a result, the slots, as viewed from one axial side, are Fig. 9A, all are arranged at different positions from each other. This allows the slots to partially overlap each other.

[0097] Similar to this configuration, in the Fig. 11 to 14 shown configuration of the Fig. 11 can be formed in the first end plate at several positions in the circumferential direction. Then, in the second end plate 40, a V-shaped arrangement similar to that shown in Fig. 13 shown V-shaped arrangement of the pin holes at several positions in the circumferential direction. The V-shaped arrangements of the pin holes of Fig. 11 and Fig. 13 correspond to each other in a state in which the first end plate 30 is arranged upside down. For this reason, steel sheets having the same shape are used for a first steel sheet constituting the first end plate and a second steel sheet constituting the second end plate, so that they are laminated in a state in which their front and back surfaces are arranged upside down. Then, as shown in Fig. 14, at least some of the pin holes, viewed from one axial side, may be arranged at different positions. Alternatively, all the pin holes may be arranged at different positions. Furthermore, in the arrangement shown in the Fig.In the configuration shown in Figures 17 to 19, two end plates may be formed such that at least some of the slots are arranged at different positions when the end plates are upside down, and the two end plates may be laminated such that one of them is upside down. In such a configuration, a laminated structure of the end plates may be formed such that one of two end plates having the same shape is upside down and laminated, thereby making it possible to reduce manufacturing costs.

[0098] Note that the configurations of the examples refer to a case where two magnets 16 are arranged in a V-shape. However, magnets in the rotor 10 may also be arranged linearly along the circumferential direction.

Claims

[1] Electric lathe rotor (10) comprising: a rotor core (12) comprising a plurality of core steel sheets (13) laminated together and having a magnet hole (14) extending in an axial direction of the electric rotating machine rotor (10); a magnet (16) arranged in the magnet hole (14); and a first end plate (30) disposed adjacent to an axial end face of the rotor core (12); characterized by , that: the electric lathe rotor (10) further comprises a second end plate (40) laminated adjacent to a surface of the first end plate (30) on a side opposite the surface adjacent to the axial end face, where: the core steel sheets (13), the first end plate (30) and the second end plate (40) are made of the same material, the first end plate (30) has at least one first hole (32, 33; 32a, 32b, 33a, 33b; 36, 37, 38; 50) and the first end plate (30) covers an axial end face of the magnet (16) within the magnet hole (14), viewed from an axial side of the rotor core (12), the second end plate (40) has at least one second hole (42, 43; 42a, 42b, 43a, 43b; 46, 47, 48; 60), the first hole (32, 33; 32a, 32b, 33a, 33b; 36, 37, 38; 50) and the second hole (42, 43; 42a, 42b, 43a, 43b; 46, 47, 48; 60), viewed from one axial side of the rotor core (12), overlap with at least a part of the magnet (16) in the axial end face of the magnet hole (14), and the first hole (32, 33; 32a, 32b, 33a, 33b; 36, 37, 38; 50) comprises a part which, viewed from the one axial side of the rotor core (12), is at least partially arranged at a position different from that of the second hole (42, 43; 42a, 42b, 43a, 43b; 46, 47, 48; 60). [2] Electric lathe rotor (10) according to claim 1, wherein: the rotor core (12) comprises a resin portion (18; 18a, 18b) disposed in at least a part of a gap between the magnet hole (14) and the magnet (16) and extending in the axial direction; the first hole (32, 33; 32a, 32b, 33a, 33b; 36, 37, 38; 50) and the second hole (42, 43; 42a, 42b, 43a, 43b; 46, 47, 48; 60), viewed from one axial side, overlap with an axial end face of the resin portion (18; 18a, 18b); and a part where the first hole (32, 33; 32a, 32b, 33a, 33b; 36, 37, 38; 50) and the second hole (42, 43; 42a, 42b, 43a, 43b; 46, 47, 48; 60) overlap with the axial end surface of the resin portion (18; 18a, 18b), a part where the first hole (32, 33; 32a, 32b, 33a, 33b; 36, 37, 38; 50) includes a part that is at least partially located at a position different from that of the second hole (42, 43; 42a, 42b, 43a, 43b; 46, 47, 48; 60) is different. [3] Electric lathe rotor (10) according to claim 1, wherein: the first hole comprises a plurality of first holes (36; 36a) arranged in the first end plate (30); the second hole comprises a plurality of second holes (46) arranged in the second end plate (40); and the plurality of first holes (36; 36a) and the plurality of second holes (46), viewed from one axial side, overlap with the axial end face of the magnet (16). [4] Electric lathe rotor (10) according to claim 3, wherein: the rotor core (12) comprises a resin portion (18; 18a, 18b) disposed in at least a part of a gap between the magnet hole (14) and the magnet (16) and extending in the axial direction; the first end plate (30) comprises a plurality of third holes (37, 38); the second end plate (40) comprises a plurality of fourth holes (47, 48); and the plurality of third holes (37, 38) and the plurality of fourth holes (47, 48) overlap with the resin portion (18; 18a, 18b) as viewed from the one axial side, and each of the plurality of third holes (37, 38) is at least partially arranged at a position different from each position of the plurality of fourth holes (47, 48). [5] The electric rotating machine rotor (10) according to claim 4, wherein the first holes (36a) and the third holes (37a) are circular, and each diameter of the third holes (37a) is smaller than each diameter of the first holes (36a). [6] The electric rotating machine rotor (10) according to claim 5, wherein an arrangement distance between the first holes (36a) is larger than an arrangement distance between the third holes (37a). [7] Electric lathe rotor (10) according to one of claims 1 to 6, wherein: the first end plate (30) and the second end plate (40) have the same shape; and the first end plate (30) and the second end plate (40) are laminated in a state in which a phase in the circumferential direction of the first end plate (30) is different from a phase in the circumferential direction of the second end plate (40). [8] Electric lathe rotor (10) according to one of claims 1 to 6, wherein: the first end plate (30) and the second end plate (40) have the same shape; and the first end plate (30) and the second end plate (40) are laminated in a state in which one of the first end plate (30) and the second end plate (40) is arranged upside down.

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