Rotor of a synchronous reluctance motor

Abstract

To obtain a rotor of a synchronous reluctance motor having a simple structure and low cost and capable of realizing balance adjustment and suppression of axial deformation of a rotor core.SOLUTION: A rotor 30 includes a cylindrical rotor core 31 in which a plurality of magnetic steel plates formed with magnetic poles by a plurality of flux barriers 32 arranged in the radial direction are laminated, a disc-shaped balance ring 50 made of a magnetic material and disposed at both ends of the rotor core 31 in the axial direction, and a non-magnetic spacer 51 that is sandwiched between the balance ring 50 and the rotor core 31 such that one surface abuts the flux barrier 32 in the rotor core 31 and the other surface abuts the balance ring 50. The spacer 51 has an annular shape with a discontinuous portion.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to rotors for synchronous reluctance motors. [Background technology]

[0002] A synchronous reluctance motor generates rotational force by generating reluctance torque in the rotor using magnetic flux generated by passing current through the stator coil. The rotor core of a synchronous reluctance motor is made of laminated electromagnetic steel sheets and has a cylindrical shape. The rotor core of a synchronous reluctance motor has a characteristic salient shape to increase reluctance torque and improve electrical performance. Specifically, the rotor core has multiple flux barriers arranged radially to block magnetic flux in the q-axis direction.

[0003] Synchronous reluctance motors use a structure in which balance rings or end plates are arranged to abut both axial ends of the rotor core. The purpose of the balance rings or end plates is to adjust the balance and suppress axial deformation of the rotor core. In Patent Document 1, balance rings are provided on both axial outer sides of a rotor core having multiple slits that serve as flux barriers. The balance rings are composed of a first ring made of a magnetic material and a second ring made of a non-magnetic material, and the outer periphery of the first ring and the inner periphery of the second ring are joined by shrink fitting or adhesive. The first ring is cross-shaped so as to avoid the magnetic path between the slits, and abuts the rotor core at a portion other than the magnetic path. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-104224 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, the first ring, which is made of a magnetic material, contacts the rotor core. Therefore, in order to suppress leakage flux and eddy current loss in the rotor core, the first ring has a complex shape, such as a cross shape, which increases costs.

[0006] The present disclosure has been made in view of the above, and aims to provide a rotor for a synchronous reluctance motor that has a simple structure, is low cost, and is capable of achieving balance adjustment and suppressing axial deformation of the rotor core. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the object, the rotor of a synchronous reluctance motor of the present disclosure comprises a cylindrical rotor core formed by laminating a plurality of magnetic steel plates, with magnetic poles formed by a plurality of radially arranged flux barriers, disk-shaped balance rings made of a magnetic material disposed at both axial ends of the rotor core, and a non-magnetic spacer sandwiched between the balance rings and the rotor core so that one surface abuts against the flux barriers in the rotor core and the other surface abuts against the balance ring. It is the edge It has a circular ring shape with discontinuities, It consists of a single or multiple round rod material, the ends of which protrude into the balance ring, which has positioning holes into which the protruding ends of the rod material are inserted. [Effects of the Invention]

[0008] The rotor of the synchronous reluctance motor of the present disclosure has the advantage of being able to achieve balance adjustment and suppression of axial deformation of the rotor core with a simple structure and at low cost. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic front view in cross section showing the configuration of a synchronous reluctance motor according to a first embodiment of the present invention; [Figure 2] FIG. 10 is a schematic front view in cross section showing the configuration of another synchronous reluctance motor according to the first embodiment. [Figure 3]FIG. 1 is a cross-sectional view showing a schematic configuration of a stator and a rotor of a synchronous reluctance motor according to a first embodiment. [Figure 4] FIG. 1 is a cross-sectional view showing the configuration of a synchronous reluctance motor of a comparative example. [Figure 5] FIG. 1 is a cross-sectional view showing a configuration of a rotor of a synchronous reluctance motor according to a first embodiment. [Figure 6] FIG. 1 is a perspective view showing a configuration of a balance ring according to a first embodiment; [Figure 7] FIG. 1 is a perspective view showing a configuration of a spacer according to a first embodiment; [Figure 8] Schematic diagram for explaining a method for manufacturing a spacer according to the first embodiment. [Figure 9] FIG. 10 is a perspective view showing another configuration of the balance ring according to the first embodiment; [Figure 10] FIG. 10 is a perspective view showing still another configuration of the balance ring according to the first embodiment; [Figure 11] FIG. 10 is a cross-sectional view showing the configuration of a rotor of a synchronous reluctance motor according to a second embodiment. [Figure 12] FIG. 10 is a perspective view showing the configuration of a spacer according to a second embodiment. [Figure 13] Schematic diagram for explaining a method for manufacturing a spacer according to the second embodiment. [Figure 14] FIG. 10 is a cross-sectional view showing the configuration of a rotor of a synchronous reluctance motor according to a third embodiment. [Figure 15] FIG. 10 is a perspective view showing the configuration of a spacer according to a third embodiment. [Figure 16] Schematic diagram for explaining a method for manufacturing a spacer according to the third embodiment. [Figure 17] FIG. 10 is a perspective view showing the configuration of a balance ring according to a fourth embodiment. [Figure 18] FIG. 10 is a perspective view showing the configuration of a balance ring and a spacer according to a fourth embodiment. [Figure 19] FIG. 10 is a cross-sectional view showing the configuration of a rotor of a synchronous reluctance motor according to a fifth embodiment. [Figure 20] FIG. 13 is a perspective view showing the configuration of a spacer according to a fifth embodiment. [Figure 21]FIG. 13 is a perspective view showing another configuration of the spacer according to the fifth embodiment. [Figure 22] FIG. 13 is a cross-sectional view showing the configuration of a rotor of a synchronous reluctance motor according to a sixth embodiment. [Figure 23] FIG. 13 is a perspective view showing the configuration of a balance ring according to a sixth embodiment. [Figure 24] FIG. 13 is a perspective view showing the configuration of a spacer according to a sixth embodiment. [Figure 25] FIG. 13 is a cross-sectional view showing the configuration of a rotor of a synchronous reluctance motor according to a seventh embodiment. [Figure 26] FIG. 13 is a perspective view showing the configuration of a spacer according to a seventh embodiment. [Figure 27] FIG. 20 is a cross-sectional view showing the configuration of a rotor of a synchronous reluctance motor according to an eighth embodiment. [Figure 28] FIG. 13 is a perspective view showing the configuration of a spacer according to an eighth embodiment. [Figure 29] FIG. 13 is a perspective view showing the configuration of a balance ring according to a ninth embodiment. [Figure 30] FIG. 13 is a perspective view showing the configuration of a spacer according to a ninth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] A rotor of a synchronous reluctance motor according to an embodiment will be described in detail below with reference to the drawings.

[0011] Embodiment 1 1 is a schematic half-sectional front view showing the configuration of a synchronous reluctance motor 10 according to a first embodiment. Synchronous reluctance motor 10 includes a housing 11, a stator 20, and a rotor 30. Housing 11 has a cylindrical frame 12 with a bottom, and a bracket 13 that closes the opening of frame 12. Stator 20 is fixedly fitted within the cylindrical portion of frame 12. Rotor 30 is disposed on the inner periphery of stator 20 and is supported by the bottom of frame 12 and bracket 13 via bearings 14 so as to be rotatable about a rotating shaft 33.

[0012] Fig. 2 is a schematic half-sectional front view showing the configuration of another synchronous reluctance motor 10a according to embodiment 1. Synchronous reluctance motor 10a includes a housing 11a, a stator 20, and a rotor 30. Housing 11a of synchronous reluctance motor 10a shown in Fig. 2 includes a frame 12a that is cylindrical rather than cylindrical with a bottom, and two brackets 13 that close openings at both ends of frame 12a.

[0013] FIG. 3 is a cross-sectional view showing a schematic configuration of stator 20 and rotor 30 of synchronous reluctance motor 10 according to the first embodiment. Stator 20 includes stator core 21 and stator coil 22. Stator core 21 includes a plurality of teeth 21a arranged in an annular shape and a back yoke portion 21b connecting the plurality of teeth 21a at their outer peripheries. Stator coil 22 is wound around each of the plurality of teeth 21a. Stator core 21 is made of a thin magnetic plate (mainly a silicon steel plate). Stator core 21 is formed into a cylindrical shape by laminating a plurality of annular steel plates, each having a plurality of teeth 21a formed at equal intervals on its inner circumferential surface. The laminated steel plates are joined together in the lamination direction by welding or caulking the outer peripheries. Stator coil 22 receives an AC current supplied from an AC power supply (e.g., an inverter) (not shown) to generate a rotating magnetic field.

[0014] The rotor 30 has a rotor core 31 and a rotating shaft 33 that passes through the center of the rotor core 31. The rotor core 31 is formed into a cylindrical shape by laminating multiple annular magnetic steel plates, which are joined together in the lamination direction by welding or crimping the outer periphery. The rotor core 31 has multiple flux barriers 32, which are arc-shaped grooves arranged radially. The multiple flux barriers 32 are arranged at intervals in multiple layers per magnetic pole to block magnetic flux 41 that is ineffective for the rotation of the rotor core 31 (q-axis magnetic flux) and allow magnetic flux 40 that is effective for the rotation to pass. In other words, a magnetic pole is formed by the multiple flux barriers 32 arranged radially. Each flux barrier 32 is formed in an arc shape that convexly faces radially inward of the rotor core 31. The rotor core 31 has an iron core portion 32a sandwiched between the flux barriers 32. A plurality of flux barriers 32 provided on rotor core 31 form d-axis 42, which is the direction in which magnetic flux does not easily flow, and q-axis 43, which is the direction in which magnetic flux does easily flow.

[0015] As described above, when an AC current is supplied to the stator coil 22 from an AC power supply (not shown), a magnetic field is generated inside the stator 20. Depending on the polarity of the magnetic field generated by the stator coil 22, a magnetic flux is generated that passes through the magnetic path 44 formed by the rotor core 31. The magnetic path 44 represents a magnetic path for one magnetic pole. The magnetic flux passing through the magnetic path 44 circulates through the core portion 32a sandwiched between the flux barriers 32 of the rotor core 31, the teeth portion 21a of the stator core 21, and the back yoke portion 21b. The AC current supplied from the AC power supply changes the polarity of the magnetic field generated by the stator coil 22 so that the rotor 30 rotates around the rotation axis 33. The rotor 30 rotates around the rotation axis 33 due to reluctance torque generated when the rotor core 31, which is a magnetic material, is attracted to the poles of the magnetic field.

[0016] FIG. 4 is a cross-sectional view showing the configuration of a synchronous reluctance motor of a comparative example. FIG. 4 corresponds to the cross-sectional view taken along line IV in FIG. 3. Balancing rings 34 made of a magnetic material are disposed on both sides of a rotor core 31 having multiple flux barriers 32 and multiple core portions 32a. The balancing rings 34 are used for balance adjustment and to fix the rotor core 31. Here, the path of the magnetic flux ineffective for rotation (q-axis magnetic flux) 41 is blocked by multiple flux barriers 32, resulting in a large magnetic resistance on the q-axis and a smaller magnetic flux on the q-axis than the magnetic flux effective for rotation (d-axis magnetic flux). However, if the balancing ring 34 is made of a magnetic material, axial leakage magnetic flux will occur through the balancing ring 34, as indicated by arrow 46, increasing the q-axis magnetic flux and resulting in deterioration of motor characteristics such as reduced torque and increased loss.

[0017] Fig. 5 is a cross-sectional view showing the configuration of rotor 30 of synchronous reluctance motor 10 according to embodiment 1. Fig. 5 corresponds to the cross-sectional view taken along line IV in Fig. 3. Fig. 6 is a perspective view showing the configuration of balance ring 50 according to embodiment 1. Fig. 7 is a perspective view showing the configuration of a spacer according to embodiment 1. Fig. 8 is a schematic view for explaining a manufacturing method of spacer 51 according to embodiment 1.

[0018] As shown in Fig. 5, balance rings 50, which are end plates made of a magnetic material, are arranged on both sides of the rotor core 31, which has multiple flux barriers 32 and multiple core portions 32a. The balance rings 50 are disk-shaped and are used for balance adjustment and to secure the rotor core 31. As shown in Fig. 6, the surface of the balance ring 50 facing the rotor core 31 is provided with an annular groove 50c for positioning an annular spacer 51. The spacer 51 is provided between the balance ring 50 and the rotor core 31. The spacer 51 fits into the groove 50c provided in the balance ring 50.

[0019] The balance ring 50 is made of a magnetic material and manufactured by casting or cutting. To correct the balance, the back surface 50a or the side surface (radial end surface) 50b of the balance ring 50 is subjected to removal processing, such as creating a recess with a tool such as a drill or end mill, to shift the center of gravity of the balance ring 50 and correct the balance of the rotor 30. The balance ring 50 has a through hole 60 in the center for fixing the rotating shaft 33.

[0020] As shown in FIG. 7 , the spacer 51 has an annular shape. One surface of the spacer 51 abuts against the flux barrier 32 of the rotor core 31, and the other surface abuts against the balance ring 50. The spacer 51 is sandwiched between the balance ring 50 and the rotor core 31. As shown in FIG. 8 , the spacer 51 is manufactured by cutting a round bar of non-magnetic material such as aluminum or stainless steel to a certain length and plastically deforming it into an annular shape using a press, wire bender, or other method. Thus, the spacer 51 is composed of a round bar. In this specification, the term "bar" is defined to include not only the concept of rod material but also the concept of wire material. The thickness of the bar material and the diameter of the annular shape can be selected arbitrarily. Because the spacer 51 is manufactured by bending a round bar into an annular shape, which is a type of plastic deformation, a seam 51a is always present as a discontinuous portion. The end faces of the seam 51a may be in contact, or a gap may be formed without contact. In order to restrain rotor core 31 in the axial direction and suppress imbalance of spacer 51, it is preferable that the gap at joint 51a is small.

[0021] Fig. 9 is a perspective view showing another configuration of the balance ring 50 according to embodiment 1. Fig. 10 is a perspective view showing yet another configuration of the balance ring 50 according to embodiment 1. In the balance ring 50 shown in Fig. 9, annular protrusions 50d are provided on the outer periphery of the balance ring 50 in order to position and fix the spacers 51. In the balance ring 50 shown in Fig. 10, two parallel rows of annular protrusions 50e are provided on the outer periphery of the balance ring 50 in order to position and fix the spacers 51.

[0022] In this way, in the first embodiment, a non-magnetic spacer 51 having a circular ring shape and a joint 51a is disposed between the balance ring 50 and the rotor core 31. That is, the spacer 51 is formed by plastically deforming a round bar material, which is readily available, inexpensive, and easy to process, into a circular ring shape. This results in a high material yield, easy processing, and a low-cost spacer. Therefore, balance adjustment and suppression of axial deformation of the rotor core 31 can be achieved with a simple structure and at low cost.

[0023] Embodiment 2 FIG. 11 is a cross-sectional view showing the configuration of rotor 30 of synchronous reluctance motor 10 according to embodiment 2. FIG. 12 is a perspective view showing the configuration of spacer 52 according to embodiment 2. FIG. 13 is a schematic diagram for explaining a method for manufacturing spacer 52 according to embodiment 2. In embodiment 2, spacer 52 has a rectangular cross-sectional shape. The same balance ring 50 as in embodiment 1 is used, but the positions and dimensions of groove 50c, annular protrusion 50d, and annular protrusion 50e must be determined according to the dimensions of rectangular spacer 52.

[0024] As in the first embodiment, the spacer 52 is manufactured by cutting a square bar of non-magnetic material such as aluminum or stainless steel to a certain length and plastically deforming it into a ring shape in the flatwise direction 52b using a press, wire bender, or other method. Thus, the spacer 52 of the second embodiment is flatwise wound. The thickness and width of the bar and the diameter of the ring can be selected as desired.

[0025] Spacer 52 is manufactured by plastically deforming a square bar into an annular shape, and therefore always has seam 52a. Regarding seam 52a, the end faces may be in contact, or there may be a gap without contact. To restrain rotor core 31 in the axial direction and prevent imbalance of spacer 52, it is preferable that the gap created by seam 52a be small.

[0026] Thus, according to the second embodiment, the spacer 52 is constructed by flat-wounding square bar material, which is easy to bend, so that the distance between the balance ring 50 and the rotor core 31 can be effectively increased, and improved magnetic properties can be expected using a small amount of non-magnetic material.

[0027] Embodiment 3 FIG. 14 is a cross-sectional view showing the configuration of rotor 30 of synchronous reluctance motor 10 according to embodiment 3. FIG. 15 is a perspective view showing the configuration of spacer 53 according to embodiment 3. FIG. 16 is a schematic diagram for explaining a method for manufacturing spacer 53 according to embodiment 3. In embodiment 3, spacer 53 has a rectangular cross-sectional shape. Although balance ring 50 is the same as in embodiment 1, the positions and dimensions of groove 50c, annular protrusion 50d, and annular protrusion 50e must be determined according to the dimensions of rectangular spacer 53.

[0028] As in the first embodiment, the spacer 53 is manufactured by cutting a square bar of non-magnetic material such as aluminum or stainless steel to a certain length and plastically deforming it into an annular shape in the edgewise direction 53b using a press, wire bender, or other method. Thus, the spacer 53 of the third embodiment is edgewise wound. The thickness and width of the bar and the diameter of the annular shape can be selected as desired.

[0029] Spacer 53 is manufactured by plastically deforming a square bar into an annular shape, and therefore always has seam 53a. Regarding seam 53a, the end faces may be in contact, or there may be a gap without contact. To restrain rotor core 31 in the axial direction and prevent imbalance of spacer 53, it is preferable that the gap created by seam 53a be small.

[0030] Thus, according to embodiment 3, the spacer 53 is constructed by edgewise winding square bar material, so that the contact area between the balance ring 50 and the spacer 53 and the contact area between the rotor core 31 and the spacer 53 can be made large, and a stable spacer can be constructed.

[0031] Embodiment 4 FIG. 17 is a perspective view showing the configuration of a balance ring 50 according to the fourth embodiment. FIG. 18 is a perspective view showing the configurations of a balance ring 50 and a spacer 51 according to the fourth embodiment. In the fourth embodiment, the balance ring 50 has arc-shaped protrusions 50f for positioning and fixing the spacer 51, which are provided at intervals rather than around the entire periphery. The protrusions 50f are arranged in two parallel rows. The round bar material of the first embodiment is used as the spacer 51.

[0032] If the balance ring 50 is provided with protrusions 50f, the distance to the rotor core 31 will be reduced by the height of the protrusions 50f, which may reduce magnetic resistance and increase leakage flux. Therefore, in the fourth embodiment, by arranging the protrusions 50f at the d-axis position, the distance between the balance ring 50 and the rotor core 31 can be increased at the q-axis position, thereby effectively suppressing leakage flux.

[0033] The protrusions 50f of the balance ring 50 may be provided in only one row on the outer periphery, as shown in Figure 9. Furthermore, the spacer 51 may be made of not only a round bar but also a flatwise wound square bar as shown in embodiment 2 or an edgewise wound square bar as shown in embodiment 3. The diameter of the round bar used for the spacer 51, the width and thickness of the square bar, the diameter of the spacer 51, and the number, position, and shape of the protrusions on the balance ring 50 may be selected as desired.

[0034] As described above, according to the fourth embodiment, it is possible to reduce the weight of the structure for positioning the spacer 51 in the balance ring 50.

[0035] Embodiment 5 FIG. 19 is a cross-sectional view showing the configuration of rotor 30 of synchronous reluctance motor 10 according to embodiment 5. FIG. 20 is a perspective view showing the configuration of spacer 54 according to embodiment 5. FIG. 21 is a perspective view showing another configuration of spacer 54 according to embodiment 5. In embodiment 5, spacer 54 is formed by winding a round bar material over multiple turns. That is, spacer 54 is formed from multiple turns of bar material. Since spacer 54 according to embodiment 5 is formed by winding a round bar material over multiple turns, it necessarily has two end portions 54a as discontinuous portions.

[0036] The spacers 54 may be wound tightly as shown in Fig. 20, or may be spirally wound with spaces between the round bars as shown in Fig. 21, so as to cover a wide area with a small amount of material. As shown in Fig. 19, the spacers 54 are sandwiched between the balance ring 50 and the rotor core 31 over multiple turns. The spacer 54 on the left side of Fig. 19 shows the tightly wound spiral spacer shown in Fig. 20, and the spacer 54 on the right side shows the spaced spiral spacer shown in Fig. 21.

[0037] Spacer 54 may be made of not only round bar material but also flatwise wound square bar material as shown in the second embodiment or edgewise wound square bar material as shown in the third embodiment. Balancing ring 50 may have any of the following shapes: groove 50c as shown in FIG. 6, projection 50d provided on the outer periphery as shown in FIG. 9, two parallel annular projections 50e as shown in FIG. 10, and intermittently arranged projections 50f as shown in FIG. 17. The diameter of the round bar material used for spacer 54, the width and thickness of the square bar material, the diameter of spacer 54, the number of spiral turns, the spiral spacing, the number of grooves on balance ring 50, and the number, position, and shape of projections may be selected arbitrarily.

[0038] Thus, according to embodiment 5, the spacer 54 is formed by winding a round bar material around multiple times, so that the contact area between the balance ring 50 and the spacer 54 and the contact area between the rotor core 31 and the spacer 54 can be made large, and a stable spacer can be formed.

[0039] Embodiment 6 FIG. 22 is a cross-sectional view showing the configuration of the rotor 30 of the synchronous reluctance motor 10 according to the sixth embodiment. FIG. 23 is a perspective view showing the configuration of a balance ring 50 according to the sixth embodiment. FIG. 24 is a perspective view showing the configuration of a spacer 51 according to the sixth embodiment. In the sixth embodiment, as shown in FIG. 24, the spacer 51 has bent portions 51c at both ends. The bent portions 51c are configured to protrude toward the opposing balance ring 50, i.e., in the axial direction of the rotor 30. As shown in FIG. 23, the balance ring 50 has holes 50g into which the bent portions 51c of the spacer 51 are inserted. The spacer 51 can be positioned on the balance ring 50 by inserting the bent portions 51c at the ends of the spacer 51 into the holes 50g. The holes 50g may be machined holes or cast holes, and the depth, size, shape, and position of the holes 50g can be determined arbitrarily.

[0040] 24, the bent portions 51c are provided on both ends, but the bent portion 51c may be provided on only one side. When the bent portion 51c is provided on only one side, accurate positioning cannot be achieved with only the bent portion 51c on one side, so it is preferable to use the groove 50c shown in FIG. 6, the protrusion 50d shown in FIG. 9, or the protrusion 50e shown in FIG. 10 in combination with the hole 50g.

[0041] Spacer 51 may be made of not only round bar material but also flatwise wound square bar material as shown in the second embodiment or edgewise wound square bar material as shown in the third embodiment. Even when spacer 51 has bent portions 51c at both ends, balance ring 50 may use groove 50c shown in FIG. 6, protrusion 50d shown in FIG. 9, protrusion 50e shown in FIG. 10, or intermittently arranged protrusions 50f shown in FIG. 17 in combination with holes 50g. The diameter of the round bar material used for spacer 51, the width and thickness of the square bar material, the diameter of spacer 51, the number of spiral turns, the spiral spacing, the number of grooves on balance ring 50, and the number, position, and shape of protrusions may be selected arbitrarily.

[0042] Thus, according to the sixth embodiment, the spacer 51 is provided with a bent portion 51c, and the balance ring 50 is provided with a hole 50g into which the bent portion 51c is inserted. Therefore, the spacer 51 can be positioned on the balance ring 50 without using the groove 50c or the protrusions 50d, 50e, and the distance between the balance ring 50 and the rotor core 31 can be effectively increased.

[0043] Embodiment 7 FIG. 25 is a cross-sectional view showing the configuration of the rotor 30 of the synchronous reluctance motor 10 according to the seventh embodiment. FIG. 26 is a perspective view showing the configuration of a spacer 54 according to the seventh embodiment. In the seventh embodiment, the spacer 54 is formed by winding a round bar material multiple times, as shown in FIG. 20 . The spacer 54 has bent portions 54g at both ends. The bent portions 54g are configured to protrude toward the opposing balance ring 50, i.e., in the axial direction of the rotor 30. As shown in FIG. 25 , the balance ring 50 has holes 50g into which the bent portions 54g of the spacer 54 are inserted. The spacer 54 can be positioned relative to the balance ring 50 by inserting the bent portions 54g at the ends of the spacer 54 into the holes 50g. The holes 50g may be machined or cast holes, and the depth, size, shape, and position of the holes 50g can be determined as desired.

[0044] The spacers 54 may be wound tightly as shown in Fig. 26, or may be spirally wound with spaces between the round rods as shown in Fig. 21. The spacer 54 on the left side of Fig. 25 shows the tightly wound spiral spacer shown in Fig. 26, and the spacer 54 on the right side shows the spaced spiral spacer shown in Fig. 21.

[0045] Spacer 54 may be made of not only round bar material but also flatwise wound square bar material as shown in the second embodiment or edgewise wound square bar material as shown in the third embodiment. In addition, balance ring 50 may use a combination of groove 50c shown in FIG. 6, protrusion 50d shown in FIG. 9, protrusion 50e shown in FIG. 10, and intermittently arranged protrusions 50f shown in FIG. 17, and holes 50g. The diameter of the round bar material used for spacer 54, the width and thickness of the square bar material, the diameter of spacer 54, the number of spiral turns, the spiral spacing, the number of grooves on balance ring 50, and the number, position, and shape of the protrusions may be selected arbitrarily.

[0046] As described above, according to the seventh embodiment, the spacer 54 wound over multiple turns is provided with the bent portion 54g, and the balance ring 50 is provided with the hole 50g into which the bent portion 54g is inserted, so that the spacer 54 can be positioned on the balance ring 50 without using the groove 50c or the protrusions 50d, 50e, and the gap between the balance ring 50 and the rotor core 31 can be effectively increased. Furthermore, the contact area between the balance ring 50 and the spacer 54 and the contact area between the rotor core 31 and the spacer 54 can be widened, and a stable spacer can be configured.

[0047] Embodiment 8 FIG. 27 is a cross-sectional view showing the configuration of rotor 30 of synchronous reluctance motor 10 according to embodiment 8. FIG. 28 is a perspective view showing the configuration of spacer 54 according to embodiment 8. In embodiment 8, spacer 54 is formed by winding a round bar material multiple times, as shown in FIG. 20 . Spacer 54 has a bent portion 54g at its outer circumferential end that protrudes toward balance ring 50, and a bent portion 54h at its inner circumferential end that protrudes radially inward of spacer 54. As shown in FIG. 27 , balance ring 50 has a hole 50g into which bent portion 54g of spacer 54 is inserted. Rotating shaft 33 has a hole 33a into which bent portion 54h of spacer 54 is inserted. By inserting bent portion 54g of spacer 54 into hole 50g of balance ring 50 and inserting bent portion 54h of spacer 54 into hole 33a of rotating shaft 33, spacer 54 can be positioned relative to balance ring 50. The holes 50g and 33a may be machined holes or cast holes, and the depth, size, shape and position of the holes 50g and 33a may be determined arbitrarily.

[0048] Spacer 54 may be made of not only round bar material but also flatwise wound square bar material as shown in the second embodiment or edgewise wound square bar material as shown in the third embodiment. In addition, balance ring 50 may use a combination of groove 50c shown in FIG. 6, protrusion 50d shown in FIG. 9, protrusion 50e shown in FIG. 10, and intermittently arranged protrusions 50f shown in FIG. 17, and holes 50g. The diameter of the round bar material used for spacer 54, the width and thickness of the square bar material, the diameter of spacer 54, the number of spiral turns, the spiral spacing, the number of grooves on balance ring 50, and the number, position, and shape of the protrusions may be selected arbitrarily.

[0049] Thus, according to the eighth embodiment, the spacer 54 is wound over multiple turns and is provided with the bent portions 54g and 54h, the balance ring 50 is provided with the hole 50g into which the bent portion 54g is inserted, and the rotating shaft 33 is provided with the hole 33a into which the bent portion 54h is inserted, so that the spacer 54 can be positioned on the balance ring 50 without using the groove 50c or the protrusions 50d and 50e, and the gap between the balance ring 50 and the rotor core 31 can be effectively increased. Furthermore, the contact area between the balance ring 50 and the spacer 54 and the contact area between the rotor core 31 and the spacer 54 can be widened, resulting in a stable spacer.

[0050] Embodiment 9 FIG. 29 is a perspective view showing the configuration of a balance ring 50 according to the ninth embodiment. FIG. 30 is a perspective view showing the configuration of a spacer 55 according to the ninth embodiment. In the ninth embodiment, as shown in FIG. 30, the spacer 55 has multiple bent portions 58, which are convex portions arranged at intervals. The bent portions 58 have a V-, C-, or U-shaped protrusion and are structured to protrude toward the opposing balance ring 50, i.e., in the axial direction of the rotor 30. As shown in FIG. 29, the balance ring 50 has multiple grooves 50h, which are recesses into which the multiple bent portions 58 of the spacer 55 are fitted. The spacer 55 can be positioned relative to the balance ring 50 by fitting the bent portions 58 of the spacer 55 into the grooves 50h of the balance ring 50. The spacer 55 has a seam 55a as a discontinuous portion.

[0051] The grooves 50h may be machined grooves or cast grooves, and the depth, position, width, and number of the grooves 50h can be determined arbitrarily. The shape and number of the bent portions 58 can be selected arbitrarily to match the grooves 50h of the balance ring 50. Also, bent portions 51c as shown in FIG. 24 may be formed at the end of the spacer 55. Furthermore, by modifying the V-shape, springiness can be imparted in the axial direction, thereby more effectively fixing the rotor core 31. Furthermore, the spacer 55 may be made of not only a round bar material but also a flatwise wound square bar material as shown in the second embodiment or an edgewise wound square bar material as shown in the third embodiment.

[0052] Thus, according to embodiment 9, the spacer 55 having multiple bent portions 58 and the balance ring 50 having multiple grooves 50h can be used to position the spacer 55 on the balance ring 50, thereby effectively increasing the distance between the balance ring 50 and the rotor core 31.

[0053] The configurations shown in the above embodiments are examples of the contents of the present disclosure, and may be combined with other known technologies, and parts of the configurations may be omitted or modified within the scope of the gist of the present disclosure. [Explanation of symbols]

[0054] 10,10a synchronous reluctance motor, 11,11a housing, 12,12a frame, 13 bracket, 14 bearing, 20 stator, 21 stator core, 21a teeth portion, 21b back yoke portion, 22 stator coil, 30 rotor, 31 rotor core, 32 flux barrier, 32a core portion, 33 rotating shaft, 33a,50g hole, 34,50 balance ring, 40 magnetic flux (d-axis magnetic flux), 41 magnetic flux (q-axis magnetic flux), 42 d axis, 43 q axis, 44 magnetic path, 50a back surface, 50b side surface, 50c,50h groove, 50d,50e,50f protrusion, 51,52,53,54,55 spacer, 51a,52a,53a,55a Joint, 51c, 54g, 54h, 58 folded portion, 52b flatwise direction, 53b edgewise direction, 54a end, 60 through hole.

Claims

1. a cylindrical rotor core formed by laminating a plurality of magnetic steel plates, each of which has magnetic poles formed by a plurality of radially arranged flux barriers; a balance ring having a disk shape and made of a magnetic material, the balance ring being disposed at both axial ends of the rotor core; a non-magnetic spacer sandwiched between the balance ring and the rotor core so that one surface abuts against the flux barrier of the rotor core and the other surface abuts against the balance ring; Equipped with the spacer has a circular ring shape having a discontinuous portion at an end, and is made up of a rod material having one circumference or a plurality of circumferences; the end of the bar protrudes toward the balance ring; The balance ring has a positioning hole into which the end of the protruding bar is inserted. A rotor for a synchronous reluctance motor.

2. A cylindrical rotor core made of laminated magnetic steel plates, whose magnetic poles are formed by a plurality of radially arranged flux barriers; a balance ring having a disk shape and made of a magnetic material, the balance ring being disposed at both axial ends of the rotor core; a non-magnetic spacer sandwiched between the balance ring and the rotor core so that one surface abuts against the flux barrier of the rotor core and the other surface abuts against the balance ring; Equipped with the spacer has a circular ring shape having a discontinuous portion at an end, and is made up of a rod material having one circumference or a plurality of circumferences; The spacer is One end of the rod on the outer diameter side protrudes toward the balance ring, The other end of the rod on the inner diameter side protrudes toward the inner diameter side, the balance ring has a positioning hole into which the protruding one end is inserted, The rotating shaft to which the rotor core is fixed has a positioning hole into which the protruding other end is inserted. A rotor for a synchronous reluctance motor.

3. A cylindrical rotor core made of laminated magnetic steel plates, each of which has magnetic poles formed by a plurality of radially arranged flux barriers; a balance ring having a disk shape and made of a magnetic material, the balance ring being disposed at both axial ends of the rotor core; a non-magnetic spacer sandwiched between the balance ring and the rotor core so that one surface abuts against the flux barrier of the rotor core and the other surface abuts against the balance ring; Equipped with the spacer has a circular ring shape having a discontinuous portion which is a joint, and is made of a rod material; the spacer has a plurality of protrusions protruding toward the balance ring, The balance ring has a plurality of recesses into which the plurality of protrusions fit. A rotor for a synchronous reluctance motor.

4. The bar material is a round bar.

4. A rotor for a synchronous reluctance motor according to claim 1.

5. The bar material is a flatwise wound or edgewise wound square bar.

4. A rotor for a synchronous reluctance motor according to claim 1.

6. The balance ring has an annular groove, an annular protrusion, or two parallel rows of annular protrusions for positioning the spacer.

4. A rotor for a synchronous reluctance motor according to claim 1.

7. The balance ring is for positioning the spacer. The bearing has arc-shaped protrusions that are provided intermittently in the circumferential direction, or two parallel rows of arc-shaped protrusions that are provided intermittently in the circumferential direction.

4. A rotor for a synchronous reluctance motor according to claim 1.

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