JP5045373B2 - Permanent magnet motor rotor - Google Patents

Description

  The present invention relates to a rotor (rotor) of a permanent magnet type rotating machine, and more particularly to a rotor (rotor) of a permanent magnet embedded type (IPM type: Interior Permanent Magnet) rotating machine.

  Improving output torque performance in permanent magnet embedded type rotating machines, that is, IPM (Interior Permanent Magnet) type rotating machines, in which permanent magnets for magnetic pole formation are embedded in through-holes provided inside the rotor (rotor) iron core In order to achieve this, it is necessary to increase the magnet neck torque obtained by the magnetic flux generated by the permanent magnet and the reluctance torque generated by the difference between the d-axis inductance and the q-axis inductance.

  JP-A-2001-145283 of “Patent Document 1” discloses a “rotor of a permanent magnet type rotating machine” in which a stator (stator) is formed by arranging four or more permanent magnets per magnetic pole in a polygonal shape. ), A magnetic reluctance torque can be obtained by securing the magnetic path of the magnetic flux between them. In Patent Document 1, an extension line extending radially from the center of the rotor to the central part between the poles, that is, a permanent magnet disposed along the center line between the poles, is provided between two poles adjacent to each other. By sharing between them, the number of permanent magnets is reduced and the shape of the tip of the inner periphery side of the rotor (rotor) of the permanent magnet shared by the two poles is made V-shaped. An arrangement close to the permanent magnet is possible.

  Further, as another example for increasing the magnet torque, a technique similar to that of Patent Document 1 is used. In other words, in order to increase the magnet torque, it is necessary to link most of the magnetic flux generated by the permanent magnet to the stator winding on the stator (stator) side for effective use. Therefore, it is necessary to reduce the amount of magnetic flux that leaks to the adjacent pole.

For this reason, in order to make the magnetic path between two adjacent poles narrow, a position shared between two adjacent poles, that is, an interpole flux barrier ( As a magnetic flux barrier for preventing magnetic flux leakage between the poles, an air gap is arranged, and the shape of the tip of the interpole flux barrier on the inner peripheral side of the rotor (rotor) is the permanent permanent in Patent Document 1. Similar to the shape of the tip of the magnet, it is V-shaped and is arranged close to two adjacent permanent magnets.
JP 2001-145283 A

  In order to increase the magnet torque, the structure of the rotor (rotor) of the conventional permanent magnet type rotating machine is on the center line between the poles which is the central part between two magnetic poles formed by two adjacent permanent magnets. A flux barrier (magnetic flux barrier) having a sharp V-shaped cross-section at the tip is extended from the vicinity of the outer edge of the rotor (rotor) so as to bite into both side portions of the two permanent magnets. The cross section is parallel to both side portions of the magnet.

  However, in such a structure, all the centrifugal force generated on the outer periphery side of the rotor (rotor) of the permanent magnet is regarded as the tensile force on the outer periphery side of the bridge portion located between the side surface portion of the permanent magnet and the flux barrier. In order to withstand the tensile force as the bridge portion, it is necessary to limit the width on the inner peripheral side of the bridge portion.

  Therefore, in order to secure the width between the two permanent magnets, it is not possible to sufficiently secure the width of the magnetic surface facing the stator (stator) side of the permanent magnet, and to the stator (stator) side. The amount of magnetic flux to be linked is suppressed, and the magnet torque is insufficient. For this reason, the problem that the output torque performance of a permanent-magnet-type rotary machine will fall exists.

  The present invention has been made in view of such circumstances, and is intended to increase the width of the magnetic pole surface facing the outer peripheral side of the rotor (rotor) of the permanent magnet, that is, the magnetic pole surface facing the stator (stator) side. An object of the present invention is to provide a rotor (rotor) of a permanent magnet type rotating machine that can increase the magnet torque and improve the output torque performance.

A rotor of a permanent magnet type rotating machine according to the present invention includes a cylindrical iron core, a plurality of first permanent magnets embedded at predetermined intervals in a circumferential direction of the iron core, and the first layer. A plurality of second-layer permanent magnets embedded at predetermined intervals so as to be in phase with the first layer on the inner peripheral side, and adjacent to the outer periphery of the iron core in the iron core An inter-electrode flux barrier formed so as to pass between the permanent magnets of the first layer and to the vicinity of the adjacent permanent magnets of the second layer, and the permanent magnets of the second layer A magnet side flux barrier formed respectively in contact with both side surfaces, a tangential bridge formed between the interelectrode flux barrier and the magnet side flux barrier, and a radiamb formed between the magnet side flux barriers. Tsu and bridge portion of the Y-shape is formed by the di, and having a.

According to the rotor (rotor) of the permanent magnet type rotating machine according to the present invention, from the vicinity of the outer edge of the iron core, between the adjacent first layer permanent magnets, and between the adjacent second layer permanent magnets. The inter-electrode flux barrier formed so as to reach, the side-surface flux barrier formed on both sides of the second-layer permanent magnet, and the inter-electrode flux barrier and the magnet-side flux barrier were formed. because have the bridge portion of the Y-shape is formed in radians bridges formed between tangential bridge and the magnet side surface flux barrier, it can provide the following such effects.

By forming each the magnet side flux barriers in contact with both side surfaces of the second layer of the permanent magnet, be extended to the pole between flux barriers, the position of the side surface portions of the two permanent magnets of the second layer Therefore, it is possible to reduce the width between the inner peripheral side end portions of the rotor (rotor) inner side of the two permanent magnets of the second layer . Thus, since the width of the magnetic pole surface of the second layer permanent magnet facing the stator (stator) side can be increased, the magnet torque can be increased, and thus the permanent magnet rotation The output torque performance of the machine can be improved.

  Hereinafter, the best embodiment of a rotor (rotor) of a permanent magnet type rotating machine according to the present invention will be described in detail with reference to the drawings.

  The permanent magnet type rotating machine according to the present invention includes a stator (stator) and a rotor (rotor). The stator (stator) includes an annular stator core made of laminated steel plates such as electromagnetic steel plates, and a stator winding wound in a slot of the stator core. On the other hand, the rotor (rotor) includes, for example, a cylindrical rotor core made of electromagnetic steel plates laminated with silicon steel plates and the like, and permanent magnets respectively embedded in a plurality of through holes formed in the rotor core. And is configured to be rotationally driven by a rotation shaft attached to the center of the rotor (rotor), that is, the center of the rotor core.

  The plurality of through holes drilled in the cylindrical rotor core are arranged at predetermined intervals in the circumferential direction in the vicinity of the outer edge of the rotor core, and the cross section is drilled in a substantially rectangular shape. Further, the through hole has a multilayer structure in which permanent magnets are embedded on the same d-axis of one or more layers from the outer periphery side of the rotor (rotor) to the inner periphery side of the rotor (rotor). Perforated to do. The permanent magnet embedded in each of the plurality of through-holes for forming a magnetic pole has a substantially rectangular cross section (including those with chamfered edges), and the longitudinal direction serving as the magnetic surface of the N pole and S pole is the rotor. In the circumferential direction (that is, tangential direction) of the (rotor), it is fitted and fixed in each through-hole so that the thickness direction as the side surface portion becomes the radial direction of the rotor (rotor).

  Here, in the permanent magnet type rotating machine according to the present invention, the structure of the stator (stator) may be exactly the same as that of the prior art, so the description thereof will be omitted. Only the structure will be described. The drawings used in the following description show the cross-sectional structure of the rotor (rotor) when viewed from the direction along the rotation axis.

(First embodiment)
First, a first embodiment of a rotor (rotor) of a permanent magnet type rotating machine according to the present invention will be described with reference to FIG. FIG. 1 is an enlarged cross-sectional view showing the structure of the first embodiment of the rotor (rotor) of the permanent magnet type rotating machine according to the present invention. The cylindrical rotor (rotor) is arranged along the rotation axis. The shape of the bridge portion between the two permanent magnets is shown in an enlarged manner with respect to the cross section when viewed from the other direction. FIG. 1A shows an arrangement state of a permanent magnet and a flux barrier arranged in the vicinity of the outer edge of the rotor (rotor), and FIG. 1B is formed by the shape of the flux barrier and the flux barrier. In order to explain the shape of the bridge portion, the portion surrounded by the square frame in FIG. 1A is further enlarged.

  As shown in FIG. 1 (A), in the present embodiment, the permanent layer embedded in the first layer through-hole 10 is used for forming the magnetic pole of the rotor (rotor) in the vicinity of the outer edge of the rotor (rotor). A permanent magnet having a two-layer structure including a magnet 11 and a permanent magnet 21 embedded in the second layer through-hole 20 is disposed. Each of the first-layer permanent magnet 11 and the second-layer permanent magnet 21 has a longitudinal direction arranged in the circumferential direction (that is, tangential direction) of the outer edge of the rotor (rotor), and its cross section is substantially the same. It has a rectangular structure, and both the first-layer permanent magnet 11 and the second-layer permanent magnet 21 are arranged at predetermined intervals as magnetic pole formation positions on the same d-axis. .

  Further, as the inter-pole flux barrier 3 for the magnetic flux barrier, the central portion between the two permanent magnets 11 of the first layer is passed from the vicinity of the outer edge of the rotor (rotor) toward the radial direction of the rotor (rotor). Thus, the radial direction connecting the center of the rotor (rotor) and the central part between the magnetic poles of the adjacent permanent magnets 21 until it reaches the vicinity of the outer peripheral side end parts of the two permanent magnets 21 of the second layer. A gap having a substantially polygonal cross section (for example, a pentagonal shape) is formed on the center line between the electrodes (that is, an extension line in the q-axis direction). Further, the magnet side flux barriers 12 for magnetic flux barriers are in contact with the respective side surfaces on both side surfaces of the first layer permanent magnet 11 and both side surfaces of the second layer permanent magnet 21. As the magnet side flux barrier 22, a gap having a substantially polygonal cross section is formed.

  The two tip side cross-sections that form a ridge line at the tip of the interpolar flux barrier 3 extending to the vicinity of the outer peripheral side end of the two permanent magnets 21 of the second layer are shown in FIG. The magnet side flux barriers 22 formed on both side surfaces of the magnet face the outer peripheral side cross section facing the outer peripheral side of the rotor (rotor), and both are arranged in a substantially parallel state. As a result, the rotor core region sandwiched between both the front end side cross-section forming the front end of the interelectrode flux barrier 3 and the outer peripheral side cross section facing the rotor (rotor) outer peripheral side of the magnet side flux barrier 22 As shown in FIG. 1B, a tangential bridge 5 having a substantially parallel cross section is formed in a tangential direction inclined in the circumferential direction at a predetermined intersection angle with the center line between the electrodes. .

  Moreover, about the magnet side surface flux barrier 22 formed in the both-sides surface part of the permanent magnet 21 of a 2nd layer, the inter-electrode side cross section facing the adjacent permanent magnet 21 side is substantially parallel with respect to an inter-polar centerline. A position that is formed in a state and is symmetrical with respect to the center line between the poles facing the cross section between the poles of the magnet side flux barrier 22 formed on the side face of the adjacent permanent magnet 21 (plane symmetry). Furthermore, both are arranged in a substantially parallel state. As a result, the radial bridge 4 having a substantially parallel cross section in the radial direction (radial direction) of the rotor (rotor) is formed on the center line between the poles by the two magnet side surface flux barriers 22 facing each other.

  In FIG. 1A, the first and second two-layer structure is shown as the permanent magnet embedded in the rotor (rotor). However, in the present invention, a multilayer structure having two or more layers is shown. It doesn't matter. In the case of a multilayer structure, the second layer described above corresponds to a layer disposed on the innermost side of the rotor (rotor).

  Next, the shapes of the interelectrode flux barrier 3 and the magnet side flux barrier 22, and the shapes of the radial bridge 4 and the tangential bridge 5 will be further described with reference to the enlarged view of FIG.

  As described above, the interpole flux barrier 3 is located on the centerline A between the poles of the rotor (rotor) in the middle between the magnetic poles of the adjacent permanent magnets 11 and 21. Further, the two tip side cross sections 3a sandwiching the ridge line 31 forming the tip of the rotor (rotor) inner peripheral side of the interpolar flux barrier 3 are magnets formed on the side portion of the permanent magnet 21 as described above. The side flux barrier 22 is disposed substantially parallel to the outer circumferential side cross section 22a at a position near the outer circumferential side section 22a facing the outer circumferential side of the rotor (rotor). As a result, the tangential bridge 5 is formed in the rotor core region sandwiched between the tip side cross section 3a of the interelectrode flux barrier 3 and the outer peripheral side cross section 22a of the magnet side surface flux barrier 22 as described above.

  Here, the front end side cross section 3a of the interelectrode flux barrier 3 and the outer peripheral side cross section 22a of the magnet side surface flux barrier 22 are cross sections formed close to each other and in a substantially parallel positional relationship as described above. The tangential bridge 5 is formed in a direction that intersects with the center line A in the radial direction of the rotor (rotor) at a predetermined intersection angle as an elongated substantially rectangular cross-sectional shape. In other words, the angle formed between the center line of the tangential bridge 5 and the center line A between the poles indicating the radial direction of the rotor (rotor) is a predetermined intersection angle.

  Here, the predetermined crossing angle is set so that the tip angle θ formed by the two tip side cross sections 3a forming the ridge line 31 of the tip of the interpolar flux barrier 3 becomes an obtuse angle. The tip angle θ is an angle twice the intersection angle. In addition, the width of the inter-electrode flux barrier 3 (the width of the gap in the direction perpendicular to the radial direction) is a magnet on the outer peripheral side of the rotor (rotor) of the adjacent permanent magnet 21 in order to obtain an effect for the magnetic flux barrier. The width is approximately the same as the interval between the outer peripheral end portions, and the cross-sectional shape of the interelectrode flux barrier 22 including the two left and right tip side cross sections 3a is formed symmetrically with respect to the interelectrode centerline A. Is done.

  Further, the position of the tip of the interpole flux barrier 22 on the inner peripheral side of the rotor is such that the surface connecting the outer peripheral ends of the permanent magnets 21 adjacent to each other on the outer peripheral side of the rotor intersects the interpole centerline A. It is formed on the outer peripheral side of the rotor (rotor) rather than the position, and does not extend deeper on the inner peripheral side of the rotor (rotor) until the interpolar flux barrier 22 is positioned on the side surface of the permanent magnet 21. Are arranged as follows.

  Further, as described above, the magnet side flux barrier 22 is formed on both side surfaces of the permanent magnet 21 arranged at a predetermined interval along the circumferential direction of the rotor (rotor), and has a cross section. As a polygonal gap, a magnet rises from a magnet outer peripheral end 21a on the rotor (rotor) outer peripheral side of the permanent magnet 21 and a magnet inner peripheral end 21b on the rotor (rotor) inner peripheral side. It is formed so as to cover the entire side surface portion of the permanent magnet 21 from the outer peripheral side end portion 21a to the magnet inner peripheral side end portion 21b.

  Here, as described above, the inter-electrode side cross-section 22b that forms a cross-section facing the permanent magnet 21 adjacent to the magnet side flux barrier 22 is a surface that is substantially parallel to the inter-electrode center line A. Opposite to the inter-electrode side cross-section 22b of the magnet side flux barrier 22 formed on the side surface of the permanent magnet 21, and is arranged symmetrically (plane symmetry) with respect to the inter-electrode center line A and in a close position. And is disposed substantially parallel to the inter-electrode side cross section 22b of the adjacent magnet side flux barrier 22. As a result, a radial bridge 4 having a substantially rectangular cross-section is formed on the center line A between the poles in the rotor core region sandwiched by the inter-electrode side cross-section 22b of the two adjacent magnet side flux barriers 22. Is done.

  Further, the outer peripheral side cross section 22a that forms a cross section facing the outer peripheral side of the rotor (rotor) is, as described above, the tip end portion (tip angle θ) of the interpole flux barrier 3 disposed on the interpole centerline A. ) Is disposed substantially parallel to the front end side cross section 3a of the interelectrode flux barrier 3 in a state facing the front end side cross section 3a. As a result, a tangential inclined in the circumferential direction of the rotor (rotor) at a predetermined crossing angle with the center line A between the poles is formed in the rotor core region between the tip side cross section 3a of the flux barrier 3 between the poles. A bridge 5 is formed.

  Therefore, the tangential bridge 5 sandwiched between the interpolar flux barrier 3 and the magnet side flux barrier 22 and the radial bridge 4 sandwiched between the two magnet side flux barriers 22 are as shown in FIG. A bridge portion having a substantially Y-shaped elongated cross section is formed.

  Here, as shown in FIG. 1B, when the Y-shaped bridge portion is formed, the two adjacent magnet side surface flux barriers 22 are formed so as to cover the entire area of the both side surface portions of the permanent magnet 21. As described above, the positions near the side surface portion of the permanent magnet 21 are formed by extending the two tip side cross sections 3a forming the tip portion of the interelectrode flux barrier 3 deeply to the inner peripheral side of the rotor (rotor). Until then, it is not necessary to make it a structure to eat.

  Accordingly, the tip angle θ formed by the two tip side cross-sections 3a is made an obtuse angle so that the stress load due to the centrifugal force can be equally applied to each part of the tangential bridge 5, and between the adjacent permanent magnets 21. In order to narrow the interval and make the magnetic surface of the permanent magnet 21 longer, the position of the ridge line 31 that forms the tip of the inter-electrode flux barrier 3 is set to the rotor of the two adjacent permanent magnets 21 ( Rotor) Between the outer edge side 21a of the magnet so that the surface connecting the outer edge 21a on the outer circumference side does not extend to the inner circumference side of the rotor (rotor) beyond the position intersecting the center line A between the poles. In this structure, the surface of the rotor is kept closer to the outer periphery of the rotor (rotor) than the position where the surface intersects the center line A between the poles.

  In addition, the shape of the magnet side surface flux barrier 22 shown in FIG. 1 (B) is the magnet outer side end 21a on the rotor (rotor) outer peripheral side of the permanent magnet 21 and the magnet on the inner peripheral side of the rotor (rotor). Although it has a polygonal column shape that rises almost perpendicularly to the side surface of the permanent magnet 21 from the circumferential end 21b, depending on the case, from the inner circumferential end 21b of the rotor (rotor) inner circumferential side, A triangular prism shape that rises in an oblique direction with respect to the side surface of the permanent magnet 21 toward the direction parallel to the center line A between the poles, that is, toward the outer peripheral portion of the rotor (rotor) may be used.

  As described above, a substantially Y-shaped cross section in which the magnet side flux barrier 22 is formed on both side portions of the permanent magnet 21 and the interelectrode flux barrier 3 does not extend to the vicinity of the side portion of the permanent magnet 21. By adopting a structure that forms a bridge portion, the following effects can be obtained.

  The stress applied to the rotor (rotor) by the centrifugal force is applied to not only the rigidity in the circumferential direction of the rotor core (core) on the outer periphery side of the rotor (rotor) of the permanent magnet 21 but also the crossing angle inclined in advance in the circumferential direction. The tangential bridge 5 formed in (1) can also be shared by the rigidity in the circumferential direction. As a result, the stress burden shared by the radial bridge 4 can be reduced, so that the width of the radial bridge 4 (that is, the interval between two adjacent magnet side flux barriers 22) can be reduced. Thus, by increasing the length of the magnetic pole surface facing the rotor (rotor) outer periphery side of the permanent magnet 21 (that is, the magnetic pole surface facing the stator side), the magnetic flux generated by the permanent magnet 21 is increased. It becomes possible. Therefore, the output torque performance of the permanent magnet type rotating machine can be improved by further increasing the magnet torque.

  Furthermore, by forming a Y-shaped bridge portion composed of the tangential bridge 5 and the radial bridge 4, the interpole flux barrier disposed between the two permanent magnets can be made to be the same as that of the permanent magnet as in the prior art. Since the permanent magnet 21 can be embedded in a deeper position on the inner peripheral side of the rotor (rotor) than in the case of the V-shaped bridge portion that extends deeply to the vicinity of the side surface portion, The q-axis inductance can be set to a larger value. As a result, the reluctance torque can be further increased, and thus the output torque performance of the permanent magnet type rotating machine can be improved.

  Next, an example of an experimental result related to the amount of magnetic flux linkage in which the magnetic flux from the permanent magnet is linked to the stator winding of the stator (stator) will be described with reference to FIG. In FIG. 2, as an experimental result of the interlinkage magnetic flux amount, in the case of the present embodiment in which a Y-shaped bridge portion including the tangential bridge 5 and the radial bridge 4 is formed, the interpolar flux barrier is a side surface of the permanent magnet. It is shown in contrast with the case of the prior art in which a V-shaped bridge is formed by extending deeply to the vicinity of the portion. As shown in FIG. 2, when the Y-shaped bridge portion as in the present embodiment is formed, the amount of flux linkage is improved by about 10% compared to the case of the V-shaped bridge portion of the prior art. The output torque of the permanent magnet type rotating machine can be improved by up to 5%.

  Further, in the case of the prior art in which the V-shaped bridge portion is formed only by the inter-electrode flux barrier, the tip portion of the inter-electrode flux barrier becomes an acute angle, so that the life of the die used for press working is reduced. There is also a problem. However, in the present embodiment in which the Y-shaped bridge portion is formed, as shown in FIG. 1B, the angle of the tip portion of the interelectrode flux barrier 3, that is, the tip portion of the interelectrode flux barrier 3 is formed 2. The tip angle θ formed by the two tip side cross-sections 3a can be an obtuse angle, and the angle formed by the outer peripheral side cross-section 22a of the magnet side flux barrier 22 and the inter-electrode side cross-section 22b can also be formed as an obtuse angle. As a result, it is possible to extend the life of the press working die.

  Here, in the case of a V-shaped bridge portion as in the prior art, if an attempt is made to make the V-shaped tip end an obtuse angle in order to improve the life of the press working die, the vicinity of the tip portion of the interelectrode flux barrier The width of the bridge portion on the inner peripheral side of the rotor (rotor) is widened. As a result, the amount of leakage magnetic flux between the permanent magnets increases, causing a decrease in magnet torque, which is an effective solution. It will not be.

  In the present embodiment, the tangential bridge 5 forming the Y-shaped bridge portion includes the tip side cross section 3a of the interelectrode flux barrier 3 and the outer peripheral side cross section 22a of the magnet side flux barrier whose longitudinal directions are parallel to each other. On the other hand, the radial bridge 4 has a longitudinal direction substantially parallel to each other and is sandwiched between two adjacent magnet side surface flux barriers 22b. It has a rectangular cross section. Therefore, each part of the Y-shaped bridge portion can be formed as a magnetic path having a narrow width and a long length. Thus, the amount of magnetic flux generated by the permanent magnet 21 leaks to the adjacent permanent magnet 21 side via the Y-shaped bridge formed between the poles can be reduced, and the magnet torque can be reduced. This can increase the output torque performance of the permanent magnet type rotating machine.

  Further, FIG. 1 illustrates an example in which the permanent magnet embedded in the rotor (rotor) has a two-layer structure. However, as described above, a plurality of permanent magnets are embedded in multiple layers on the same d-axis. A multi-layer structure having a large number of layers is also possible. As a result, since the difference between the d-axis inductance and the q-axis inductance can be further increased, the reluctance torque can be increased, and the permanent magnet type The output torque performance of the rotating machine can be further improved.

(Second Embodiment)
Next, a second embodiment of the rotor (rotor) of the permanent magnet type rotating machine according to the present invention will be described with reference to FIG. FIG. 3 is an enlarged cross-sectional view showing the structure of the second embodiment of the rotor (rotor) of the permanent magnet type rotating machine according to the present invention. The cylindrical rotor (rotor) is arranged along the rotation axis. As for the cross-section when viewed from the direction, the same portion as the portion surrounded by the square frame in FIG. 1A in the first embodiment is further enlarged, and the shape of the bridge portion between the two permanent magnets is increased. Show. Here, FIG. 3 of the present embodiment explains a structure for enabling the width of the tangential bridge 5 to be further narrowed as an example different from the case of FIG.

  In FIG. 3 as well as in the case of FIG. 1B of the first embodiment, in addition to the inter-electrode flux barrier 3 disposed on the inter-electrode center line A, magnets disposed on both side surfaces of the permanent magnet 21. By providing the side flux barrier 22, a Y-shaped bridge portion composed of the tangential bridge 5 and the radial bridge 4 is formed. However, in the case of FIG. 3, unlike the case of FIG. 1B, the angle α formed by the center line of the tangential bridge 5 and the center line A between the poles (that is, the flux between the poles shown in FIG. 1B). The case where a specific set value is defined for the angle (1/2) of the tip angle θ formed by the tip-side cross section 3a of the barrier 3 is described.

  In the case of FIG. 1B of the first embodiment, the tip angle θ of the interelectrode flux barrier 3 (that is, the angle formed by the two tip side cross-sections 3a forming the tip portion of the interelectrode flux barrier 3). Although the case where the obtuse angle is formed has been described, the angle between the center line of the tangential bridge 5 and the center line A between the poles, that is, the tangential angle α is defined as a predetermined crossing angle as in the present embodiment. It is possible to improve not only the centrifugal force performance but also the output torque performance, and the interpolar flux barrier 3 and the tangential bridge 5 are symmetrical with respect to the interpolar centerline A (line symmetrical). Will be formed.

  In FIG. 3, by setting the angle formed by the center line of the tangential bridge 5 and the center line A between the poles, that is, the tangential angle α, to an angle within a range of 60 ° to 70 °, for example, stress due to centrifugal force Can be distributed almost equally at each part of the tangential bridge 5, even if the tangential bridge 5 has an elongated shape, the rigidity in the circumferential direction of each part of the tangential bridge 5. The structure can withstand stress. Therefore, the width of not only the radial bridge 4 but also the tangential bridge 5 can be made narrower, and the amount of magnetic flux leaking from the permanent magnet 21 to the adjacent permanent magnet 21 can be reduced. Thus, the output torque performance can be improved.

  Furthermore, by setting the tangential angle α to an angle within the range of 60 ° to 70 °, not only the radial bridge 4 but also the tangential bridge 5 is arranged symmetrically with respect to the center line A between the poles. At the same time, the two tangential bridges 5 and the one radial bridge 4 forming the Y-shaped bridge portion are substantially equidistant from each other (that is, a range of 120 ° to 140 ° between the two tangential bridges 5). The angle between the tangential bridge 5 and the radial bridge 4 is formed as an angle within the range of 110 ° to 120 °, so that fluctuations in magnet torque and reluctance torque can be suppressed and output torque performance can be improved. Can be planned.

  For example, when the tangential angle α between the center line of the tangential bridge 5 and the center line A between the poles is changed, an example of an experimental result of experimenting the width of the tangential bridge 5 that can withstand centrifugal force. Is shown in FIG. As shown in FIG. 4, when the angle formed between the center line of the tangential bridge 5 and the center line A between the poles, that is, the tangential angle α is set to an angle within the range of 60 ° to 70 °, the tangential bridge 5 Stress due to centrifugal force is applied almost uniformly to each part, and the width of the tangential bridge 5 can be reduced to about 0.9 mm to 1.2 mm (where the tangential angle α is 65 °). In this case, the narrowest width can be 0.9 mm).

  As described above, by setting the tangential angle α to an angle within the range of 60 ° to 70 ° and forming the width of the tangential bridge 5 narrow, as described above, the magnetic flux generated by the permanent magnet 21 is Since the leakage magnetic flux leaking to the adjacent permanent magnet 21 side via the narrow tangential bridge 5 can be reduced, the magnet torque can be further increased. The output torque performance can be improved.

  Furthermore, as in the case of the first embodiment, also in this embodiment, the inner angle (that is, the distance between the ends) of the tip of the interelectrode flux barrier 3 that is twice the tangential angle α (60 ° to 70 °). The tip angle θ formed by the two tip side cross-sections 3a forming the tip of the flux barrier 3 is also formed as an obtuse angle, so that the life of the press working die used in manufacturing the rotor (rotor) is extended. Is also possible.

(Third embodiment)
Next, a third embodiment of the rotor (rotor) of the permanent magnet type rotating machine according to the present invention will be described with reference to FIG. FIG. 5 is an enlarged cross-sectional view showing the structure of the rotor (rotor) of the third embodiment of the permanent magnet type rotating machine according to the present invention. As in the case of FIG. The shape of the bridge part between two permanent magnets is shown in an enlarged manner for a cross section when the rotor is viewed from the direction along the rotation axis. FIG. 5A shows an arrangement state of the permanent magnets and the flux barrier arranged near the outer edge of the rotor (rotor), and FIG. 5B is formed by the shape of the flux barrier and the flux barrier. In order to explain the shape of the bridge portion, the portion surrounded by the square frame in FIG. 5A is further enlarged.

  In FIG. 5 of the present embodiment, as an example different from the case of FIG. 1, the magnet side flux barrier formed on both side surfaces of the permanent magnet 21 is formed not on the entire side surface of the permanent magnet 21 but on a part thereof. Is explained. That is, as for the magnet side flux barrier 22A, the rising position on the rotor (rotor) outer peripheral side rises from the magnet outer peripheral end 21a of the permanent magnet 21 as in the case of FIG. Unlike the case of FIG. 1, which is the inner peripheral end 21 b of the permanent magnet 21, the rising position on the side of the permanent magnet 21 is set to an arbitrarily determined specific position within the side surface of the permanent magnet 21. The structure which forms a space | gap part in the position brought close to the child (rotor) outer peripheral side is shown.

  That is, in the configuration of FIG. 1B of the first embodiment, the magnet side flux barrier 22 rises from the magnet outer peripheral end 21a and the magnet inner peripheral end 21b of the permanent magnet 21, and the permanent magnet 21 is formed so as to cover the entire side surface portion. However, in the case of this embodiment, as shown in FIG. 5 (B), the magnet side surface flux barrier 22A is a specific position arbitrarily defined within the magnet outer peripheral side end portion 21a of the permanent magnet 21 and the side surface portion of the permanent magnet 21. Of the permanent magnet 21 so as to cover only a part of the side surface on the outer peripheral side of the rotor (rotor), and from the inner peripheral side end 22c of the barrier. A flux barrier is not formed on the side surface portion on the inner peripheral side of the rotor (rotor) between the inner peripheral side end portion 21 b on the inner peripheral side of the rotor (rotor).

  That is, the magnet side flux barrier 22A in FIG. 5B is reduced to a substantially similar shape to the magnet side flux barrier 22 in FIG. 1B, and the rotor (rotor) outer side surface of the permanent magnet 21 is reduced. The cross-sectional shape of the magnet side flux barrier 22 </ b> A is substantially polygonal like the magnet side flux barrier 22.

  As a result, the flux barrier is not formed on the magnet inner peripheral end 21b side where the interval between the two adjacent permanent magnets 21 is narrow, so that the rotor (rotor) outer peripheral side of the permanent magnet 21 faces. The length of the magnetic surface (that is, the magnetic surface facing the stator side) can be made longer than in the case of FIG. Therefore, since the magnetic flux generated by the permanent magnet 21 can be increased, the output torque performance of the permanent magnet rotating machine can be further improved by further increasing the magnet torque.

  Next, a further different shape from the magnet side flux barrier 22A of FIG. 5 is shown in FIG. FIG. 6 is an enlarged cross-sectional view showing a structure different from that of FIG. 5 of the third embodiment of the rotor (rotor) of the permanent magnet type rotating machine according to the present invention, and FIG. ) Shows the arrangement state of the permanent magnet and the flux barrier arranged in the vicinity of the outer edge, and FIG. 6B is for explaining the shape of the flux barrier and the shape of the bridge portion formed by the flux barrier. FIG. 6A further enlarges and shows a portion surrounded by a square frame in FIG.

  In the magnet side flux barrier 22A of FIG. 5 (B), the permanent magnet 21 has a permanent magnet outer end 21a and a barrier inner peripheral end 22c at a specific position in the side surface of the permanent magnet 21. The case where a polygonal column-shaped flux barrier that rises in a substantially vertical direction with respect to the side surface of the magnet 21 is shown.

  However, in the magnet side flux barrier 22B of FIG. 6B, the outer peripheral side of the rotor (rotor) is from the magnet outer peripheral end 21a of the permanent magnet 21 to the permanent magnet 21 as in the case of FIG. The inner peripheral side of the rotor (rotor) is different from the case of FIG. 5B, and the inner peripheral side end of the barrier at a specific position within the side surface of the permanent magnet 21 From the part 22d, it rises in a direction parallel to the center line A between the poles in an oblique direction with respect to the side part of the permanent magnet 21. As a result, the magnet side flux barrier 22B of FIG. 6B is formed as a substantially triangular prism-shaped flux barrier. That is, the magnet side surface flux barrier 22B of FIG. 6B is a specific example in the side surface portion of the permanent magnet 21 without the inter-electrode side cross section 22b of the magnet side surface flux barrier 22 of FIG. This corresponds to the case where the position is formed directly from the end 22d on the inner side of the barrier.

  In the magnet side flux barrier 22B of FIG. 6 as well, as in the case of the magnet side flux barrier 22A of FIG. 5, the gap between the two adjacent permanent magnets 21 becomes narrower on the magnet inner peripheral end 21b side. Therefore, the length of the magnetic pole surface facing the rotor (rotor) outer peripheral side of the permanent magnet 21 (that is, the magnetic pole surface facing the stator side) of the permanent magnet 21 can be made longer than in the case of FIG. It becomes possible. Therefore, since the magnetic flux generated by the permanent magnet 21 can be increased, the output torque performance of the permanent magnet rotating machine can be improved by further increasing the magnet torque.

  In FIG. 6B, the end of the permanent magnet 21, that is, the magnet outer peripheral end 21a and the magnet inner peripheral end 21b are chamfered to scrape the edge, thereby concentrating stress against centrifugal force. However, this shape can be applied to FIG. 1 of the first embodiment and FIG. 5 of the present embodiment as a matter of course.

  Further, for the inter-electrode flux barrier 3 and the magnet side flux barrier 22B, the edge portion may be chamfered to form a smooth curved surface, and the same applies to FIG. 1 of the first embodiment and FIG. 5 of the present embodiment. A curved surface having no edge portion by chamfering may be used.

(Fourth embodiment)
Next, a fourth embodiment of the rotor (rotor) of the permanent magnet type rotating machine according to the present invention will be described with reference to FIG. FIG. 7 is an enlarged cross-sectional view showing the structure of the fourth embodiment of the rotor (rotor) of the permanent magnet type rotating machine according to the present invention. As in the case of FIG. The shape of the bridge part between two permanent magnets is shown in an enlarged manner for a cross section when the rotor is viewed from the direction along the rotation axis. FIG. 7A shows an arrangement state of the permanent magnets and the flux barrier arranged near the outer edge of the rotor (rotor), and FIG. 7B is formed by the shape of the flux barrier and the flux barrier. In order to explain the shape of the bridge portion, the portion surrounded by the square frame in FIG. 7A is further enlarged.

  In FIG. 7 of the present embodiment, as an example different from the case of FIG. 1 of the first embodiment, the tip of the interelectrode flux barrier formed on the interelectrode centerline A is formed by a curved surface having a circular cross section. Explains the case. That is, in the case of the interpolar flux barrier 3 of FIG. 1, a bent shape (an obtuse angle but an angle is formed) with a ridge line 31 sandwiching the tip portion on the inner peripheral side of the rotor (rotor) by two tip-side cross sections 3a having a planar shape. In the inter-electrode flux barrier 3A of FIG. 7, the side cross-section of the inter-electrode flux barrier 3A is formed without forming the ridge line 31 serving as an edge portion. The example which forms the front-end | tip part of the rotor (rotor) inner peripheral side with the cylindrical-shaped front end side curved surface 3b which makes the width | variety between diameters is shown.

  Further, in some cases, the magnet side flux barrier 22C formed on the side surface of the permanent magnet 21 may also be formed with a curved outer peripheral side cross section facing the outer edge side of the rotor (rotor). . That is, in the case of the magnet side flux barrier 22 of FIG. 1, the substantially planar outer peripheral side cross section 22a is located on the outer periphery of the rotor (rotor) at a substantially parallel position facing the tip side cross section 3a of the interelectrode flux barrier 3. It is formed so as to be chamfered with a substantially planar inter-electrode side cross-section 22b that is formed facing the side and disposed to face the adjacent magnet side surface flux barrier 22.

  On the other hand, in the case of FIG. 7 of the present embodiment, the magnet side surface flux barrier 22C formed on the side surface portion of the permanent magnet 21 has a cross section at a position facing the tip side curved surface 3b of the interpolar flux barrier 3A. An arc-shaped outer peripheral curved surface 22e is formed, and the outer peripheral curved surface 22e has an arc shape in which the magnetic surface on the outer peripheral side of the rotor (rotor) of the permanent magnet 21 and the inter-electrode side cross section 22b are tangential. The magnetic surface on the outer peripheral side of the rotor (rotor) of the permanent magnet 21 and the inter-electrode side section 22b are connected by a smooth curved surface.

  As shown in FIG. 7B, the tip of the inner peripheral side of the rotor (rotor) of the interpolar flux barrier 3A is formed by the tip-side curved surface 3b having an arc-shaped cross section and no edge portion. The cross section of the magnet side flux barrier 22C on the outer peripheral side of the rotor (rotor) of the magnet side surface flux barrier 22C is formed by the outer peripheral side curved surface 22e having an arc shape in cross section and having no edge portion. Then, the concentration of stress due to centrifugal force can be further alleviated, and the width of the tangential bridge 5 and the radial bridge 4 can be formed in a narrower shape.

  As a result, the magnetic flux generated by the permanent magnet 21 can further reduce the amount of leakage magnetic flux leaking to the adjacent permanent magnet 21 side via the tangential bridge 5 formed with a narrower width. Therefore, the output torque performance of the permanent magnet type rotating machine can be further improved.

  Next, FIG. 8 shows a shape further different from the structure of the magnet side flux barrier 22C of FIG. FIG. 8 is an enlarged cross-sectional view showing a structure different from FIG. 7 of the fourth embodiment of the rotor (rotor) of the permanent magnet type rotating machine according to the present invention, and FIG. ) Shows the arrangement state of the permanent magnet and the flux barrier arranged in the vicinity of the outer edge, and FIG. 8B is for explaining the shape of the flux barrier and the shape of the bridge portion formed by the flux barrier. FIG. 8A shows a further enlarged portion surrounded by a square frame in FIG.

  Here, the interelectrode flux barrier 3A shown in FIG. 8B has the same shape as that of the interelectrode flux barrier 3A shown in FIG. 7B, and the tip on the inner peripheral side of the rotor (rotor). The section is formed by a tip side curved surface 3b having a circular cross section.

  On the other hand, the magnet side flux barrier 22D in FIG. 8B differs from the magnet side flux barrier 22C in FIG. 7B in the entire side surface portion region of the permanent magnet 21 as in the case of the third embodiment. However, the magnet side flux barrier 22D is formed in a cylindrical shape having a circular cross section.

  That is, in the case of the magnet side surface flux barrier 22C in FIG. 7B, as described above, the magnet side surface flux barrier 22C is formed in a permanent manner as in FIG. The magnet 21 is formed so as to rise from the magnet outer peripheral end 21 a and the magnet inner peripheral end 21 b so as to cover the entire side area of the permanent magnet 21.

  On the other hand, the magnet side flux barrier 22D of FIG. 8B is between the magnet outer peripheral side end 21a of the permanent magnet 21 and the barrier inner peripheral end 22f at a specific position in the side surface of the permanent magnet 21. An interpolar barrier curved surface 22g having an arcuate cross-sectional shape is formed. Accordingly, as in the case of FIGS. 5 and 6 of the third embodiment, only a part of the side surface portion of the permanent magnet 21 on the outer peripheral side of the rotor (rotor) of the permanent magnet 21 has no edge portion. It is formed so as to be covered with a cylindrical curved flux barrier, and the rotor (rotor) inner peripheral side from the barrier inner peripheral side end 22f to the rotor (rotor) inner peripheral side magnet end 21b In the side surface portion, the flux barrier is not formed.

  That is, in the case of FIG. 8, as in the case of FIG. 7, the front end portion on the inner peripheral side of the rotor (rotor) of the interpolar flux barrier 3A is formed by the front end side curved surface 3b having no arc-shaped cross section. Further, by forming the cross section of the magnet side surface flux barrier 22C by the barrier inner peripheral end portion 22f having no arc-shaped edge portion in the cross section, it is possible to further alleviate the concentration of stress due to centrifugal force. It becomes possible to form the width of the local bridge 5 and the radial bridge 4 in a narrower shape.

  As a result, the magnetic flux generated by the permanent magnet 21 can further reduce the amount of leakage magnetic flux leaking to the adjacent permanent magnet 21 side via the tangential bridge 5 formed with a narrower width, thereby increasing the magnet torque. Thus, the output torque performance of the permanent magnet type rotating machine can be further improved.

  Further, in the magnet side surface flux barrier 22D of FIG. 8, as in the case of the magnet side surface flux barriers 22A and 22B of FIGS. Since the flux barrier is not formed on the 21b side, the length of the magnetic pole surface facing the rotor (rotor) outer peripheral side of the permanent magnet 21 (that is, the magnetic pole surface facing the stator side) is as shown in FIG. It is possible to make it even longer. Therefore, since the magnetic flux generated by the permanent magnet 21 can be increased, the output torque performance of the permanent magnet rotating machine can be further improved by further increasing the magnet torque.

1 is an enlarged cross-sectional view showing the structure of a first embodiment of a rotor (rotor) of a permanent magnet type rotating machine according to the present invention. It is a characteristic view which shows an example of the experimental result regarding the amount of magnetic flux linkage in the case of the 1st Embodiment of this invention, and the case of a prior art. It is a cross-sectional enlarged view which shows the structure of 2nd Embodiment of the rotor (rotor) of the permanent magnet type rotary machine by this invention. It is an evaluation figure which shows an example of the experimental result regarding the width | variety of the tangential bridge which can endure a centrifugal force. It is a cross-sectional enlarged view which shows the structure of 3rd Embodiment of the rotor (rotor) of the permanent-magnet-type rotary machine by this invention. It is a cross-sectional enlarged view which shows the structure different from FIG. 5 of 3rd Embodiment of the rotor (rotor) of the permanent-magnet-type rotary machine by this invention. It is a cross-sectional enlarged view which shows the structure of 4th Embodiment of the rotor (rotor) of the permanent magnet type rotary machine by this invention. It is a cross-sectional enlarged view which shows the structure different from FIG. 7 of 4th Embodiment of the rotor (rotor) of the permanent-magnet-type rotary machine by this invention.

Explanation of symbols

3, 3A: Interpolar flux barrier, 3a: Front end side cross section, 3b ... Front end side curved surface, 4 ... Radial bridge, 5 ... Tangential bridge, 10 ... Through hole, 11 ... Permanent magnet, 12 ... Magnet side flux barrier, 20 ... through-hole, 21 ... permanent magnet, 21a ... magnet outer peripheral side end, 21b ... magnet inner peripheral side end, 22,22A, 22B, 22C, 22D ... magnet side flux barrier, 22a ... outer peripheral side cross section, 22b ... pole Cross section, 22c, 22d ... Barrier inner peripheral end, 22e ... Outer peripheral curved surface, 22f ... Barrier inner peripheral end, 22g ... Interpolar barrier curved surface, 31 ... Ridge line, A ... Interpolar center line, α ... Tangential angle, θ ... tip angle.

Claims (13)

A cylindrical iron core,
In the circumferential direction of the iron core, a plurality of permanent magnets of the first layer embedded at predetermined intervals;
A plurality of second-layer permanent magnets embedded at a predetermined interval so as to be in phase with the first layer on the inner peripheral side of the first layer ;
A pole formed in the iron core so as to pass from the vicinity of the outer edge of the iron core to the vicinity of the adjacent permanent magnets of the second layer through the vicinity of the adjacent permanent magnets of the second layer. Between flux barriers,
A magnet side flux barrier formed in contact with both side surfaces of the second layer of the permanent magnets;
A Y-shaped bridge portion formed by a tangential bridge formed between the interpolar flux barrier and the magnet side flux barrier and a radian bridge formed between the magnet side flux barrier;
A rotor of a permanent magnet type electric motor characterized by comprising: In the rotor of the permanent magnet type electric motor according to claim 1,
Tip of the rotor inner circumference side of the electrode between the flux barrier is formed by two distal end side face forming a ridge to the center line passing through the center of the interpolar flux barriers, and the magnet side surface flux barrier An outer peripheral side surface facing the rotor outer peripheral side, and an outer peripheral side surface facing the rotor outer peripheral side of the magnet side flux barrier; The side surface on the outer peripheral side of the magnet side flux barrier formed on the side surface portion of the adjacent permanent magnet is formed in parallel with each of the two side surfaces on the tip side of the interpolar flux barrier. Thus, the rotor of the permanent magnet electric motor is characterized in that the tangential bridge is formed. In the rotor of the permanent magnet type electric motor according to claim 2,
A rotor of a permanent magnet electric motor, wherein a cross-sectional shape of the interpolar flux barrier is formed symmetrically with respect to the center line. In the rotor of the permanent magnet type electric motor according to claim 2 or 3,
The position of the tip of the interpole flux barrier on the rotor inner peripheral side rotates more than the position where the surface connecting the outer peripheral end of the magnets on the rotor outer peripheral side of the adjacent permanent magnet intersects the center line. A rotor of a permanent magnet electric motor, characterized in that the rotor is formed on the outer peripheral side of the child. In the rotor of the permanent magnet type electric motor according to any one of claims 2 to 4,
A rotor of a permanent magnet electric motor characterized in that an angle formed by two side surfaces on the tip side forming a tip portion on the rotor inner peripheral side of the interpolar flux barrier is an obtuse angle. In the rotor of the permanent magnet type electric motor according to any one of claims 2 to 5,
The rotor of a permanent magnet type electric motor, wherein the tangential bridge is formed so that an angle formed by a center line of the tangential bridge and the center line is within a range of 60 ° to 70 °. In the rotor of the permanent magnet type electric motor according to claim 1,
The interpolar flux barrier has side portions formed parallel to each other on both sides of the center line, and a tip portion on the rotor inner peripheral side of the interpolar flux barrier is the center of the interpolar flux barrier. A rotor of a permanent magnet electric motor, characterized in that the rotor is formed by a cylindrical curved surface having a diameter of a side portion formed on both sides of the wire. In the rotor of the permanent magnet type electric motor according to any one of claims 2 to 6 ,
The inter-electrode side facing the permanent magnet side adjacent to the magnet side flux barrier, and the inter-electrode side facing the permanent magnet side of the magnet side flux barrier formed on the side portion of the adjacent permanent magnet The radial bridge is formed by forming the side bridges in parallel and opposite to each other at symmetrical positions with respect to the center line between the poles. In the rotor of the permanent magnet type electric motor according to any one of claims 1 to 8,
The magnet side flux barrier formed on both side surfaces of the permanent magnet has a permanent magnet that extends from a magnet outer peripheral side end on the rotor outer peripheral side of the permanent magnet to a magnet inner peripheral end on the rotor inner peripheral side. A rotor of a permanent magnet electric motor, wherein the rotor is formed so as to cover the entire area of the side surface. In the rotor of the permanent magnet type electric motor according to any one of claims 1 to 8,
The magnet side flux barrier formed on both side surfaces of the permanent magnet has a side surface portion of the permanent magnet that extends from a magnet outer peripheral end portion on the rotor outer periphery side of the permanent magnet to an arbitrarily determined specific position in the side surface portion. A rotor of a permanent magnet electric motor, wherein the rotor is formed so as to cover a part of the region. In the rotor of the permanent magnet type electric motor according to claim 1 ,
The rotor of a permanent magnet type electric motor, wherein the magnet side flux barrier formed on both side surfaces of the permanent magnet has a cylindrical shape. In the rotor of the permanent magnet type electric motor according to any one of claims 1 to 10,
Wherein the shape of the magnet side flux barrier formed on both side surfaces of the permanent magnets, the rotor of the permanent magnet motor, characterized in that a three-prism shape. In the rotor of the permanent magnet type electric motor according to claim 12,
Wherein an edge portion of the three prismatic magnet side flux barrier, scraping by chamfering, smoothly curved surface and the rotor of the permanent magnet motor, characterized by.

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