JP2018023186A - Rotary electric machine rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the rotation of an end plate to a rotor core without applying an excessively large force in an axial direction from outside the end plate in a rotary electric machine rotor.SOLUTION: A rotary electric machine rotor 10 comprises: a rotor shaft 12; a rotor core 14 fixed to an outer periphery of the rotor shaft 12; a permanent magnet 24 set in a magnet mount hole 26 provided so as to extend through the rotor core 14 in an axial direction; and an end plate 34. The end plate 34 includes a non-magnetic material part made of a non-magnetic material and a magnetic material part made of a magnetic material. The magnetic material part is provided at a position, where it is opposed to the permanent magnet 24 in the axial direction, inside the non-magnetic material, and fixed to the non-magnetic material part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotating electrical machine rotor having a structure in which a permanent magnet is mounted in a rotor core.

  As a configuration of a rotor of a motor or a generator (rotary electric machine), a rotor core provided with a permanent magnet, an end plate that prevents the permanent magnet from jumping out from an end of the rotor core, and a rotor that penetrates the rotor core and the end plate A configuration including a shaft is known.

  In Patent Document 1, the end plate is fixed to the rotor shaft by shaft fitting with the rotor shaft. On the other hand, the rotor core is fixed by shaft fitting with the rotor shaft, and prevents a slip in the rotational direction by engaging a key groove provided on the rotor shaft and a key protrusion provided on the rotor core. .

JP 2005-184968 A

  Since the axial length of the end plate is shorter than the axial length of the rotor core, the contact area between the end plate and the rotor shaft is smaller than the contact area between the rotor core and the rotor shaft. Therefore, the fixing force of the end plate to the rotor shaft due to the shaft fitting is smaller than the fixing force of the rotor core to the rotor shaft. As a result, when the rotor rotates, the end plate and the rotor shaft may not rotate integrally although the rotor shaft and the rotor core rotate together.

  That is, when the rotor rotates, the end plate may rotate in the circumferential direction with respect to the rotor core.

  Therefore, as disclosed in Patent Document 1, a caulking member is provided on the rotor shaft, and the end plate is fixed to be pressed against the rotor core, that is, an axial force is applied from the outside of the end plate to May be fixed to the rotor core. By pressing the end plate against the rotor core, friction between the two increases, and rotation of the end plate relative to the rotor core is suppressed.

  However, if an excessively large force is applied in the axial direction from the outside of the end plate, an excessive mechanical load may be applied to the end plate. Also, the end plate may be fixed to the rotor shaft by using a key and a key groove. However, the end plate is thin and insufficient in strength, and a large force may be applied to the key engaging portion. .

  Accordingly, an object of the present invention is to suppress rotation of an end plate relative to a rotor core without applying an excessively large force to the end plate in a rotating electrical machine rotor.

  The rotating electrical machine rotor of the present invention includes a rotor shaft, a rotor core fixed to the outer periphery of the rotor shaft, a magnet installed in a magnet mounting hole provided so as to penetrate the rotor core in the axial direction, In a rotating electrical machine rotor comprising one or more end plates fixed to at least one of axial end portions, the end plate includes a nonmagnetic body portion made of a nonmagnetic material and a magnetic body portion made of a magnetic material. The magnetic body portion is provided at a position facing the magnet in the axial direction and inside the nonmagnetic body, and is fixed to the nonmagnetic body portion.

  With this configuration, the rotation of the end plate with respect to the rotor core can be restricted using a magnetic force acting between the magnet provided in the rotor core and the magnetic body portion provided at a position facing the magnet in the axial direction. it can. As a result, the rotation of the end plate relative to the rotor core can be suppressed as compared to a rotating electrical machine rotor that uses an end plate that does not include a magnetic body portion.

  In a preferred aspect, the magnetic body portion is in contact with an axial end surface of the rotor core.

  By setting it as this structure, the magnetic force which acts between a magnetic body part and a magnet can be enlarged compared with when the magnetic body part is not in contact with the end surface of a rotor core. As a result, the rotation of the end plate relative to the rotor core can be more restricted than when the magnetic body portion is not in contact with the end face of the rotor core.

  In a preferred aspect, the magnetic part is entirely surrounded by the axial end surface of the rotor core and the non-magnetic part or by the non-magnetic part.

  With this configuration, since the magnetic body portion is not exposed to the outside, leakage magnetic flux from the magnetic body portion to the periphery of the rotor can be reduced.

  In a preferred aspect, the magnetic body portion has an annular shape arranged concentrically with the rotor shaft.

  By adopting such a configuration, it is possible to suppress the weight balance of the end plate from being lost while minimizing the number of magnetic body portions when the magnetic body portions are provided on the end plate.

  In a preferred aspect, there are a plurality of the magnetic body portions, and the magnetic body portions are concentrically distributed with the rotor shaft.

  By setting it as this structure, compared with the case where a magnetic body part is an annular shape, it can suppress that a magnetic body part moves to the circumferential direction within a nonmagnetic body part.

  In a preferred aspect, a concave portion that is formed on one of the rotor shaft and the end plate and is concave in the radial direction, and a convex portion that is formed on the other and is convex in the radial direction are provided in the radial direction. A first engaging portion formed by engagement; a concave portion formed in one of the magnetic body portion and the non-magnetic body portion and having a concave shape in the radial direction; A second engaging portion formed by engaging a convex portion that is convex in the direction in the radial direction, and the second engagement by a circumferential fit in the first engaging portion. The feature is that the fitting in the circumferential direction at the part is tighter.

  With this configuration, the rotor shaft, the rotor core, and the magnetic body portion rotate as a unit, while the non-magnetic body portion rotates in the circumferential direction with respect to the rotor core and the rotor shaft. When the convex portion rotates in the concave portion in the first engaging portion and the second engaging portion, the convex portion on the concave wall surface in the second engaging portion before the convex portion contacts the concave wall surface in the first engaging portion. Touch. As a result, since the collision between the concave portion and the convex portion at the first engaging portion is prevented, wear of the concave portion and the convex portion at the first engaging portion can be suppressed.

  In a preferred aspect, a concave portion formed in one of the rotor shaft and the end plate and having a concave shape in the radial direction, and a convex portion having a convex shape in the radial direction when viewed from the axial direction formed in the other are provided. A third engagement portion formed by engaging in the radial direction; a fourth engagement portion formed by engaging the magnetic body portion in a recess provided in the non-magnetic body portion; The circumferential engagement of the fourth engagement portion is tighter than the circumferential engagement of the third engagement portion.

  With this configuration, the rotor shaft, the rotor core, and the magnetic body portion rotate as a unit, while the non-magnetic body portion rotates in the circumferential direction with respect to the rotor core and the rotor shaft. When the convex portion rotates in the concave portion in the first engaging portion and the fourth engaging portion, the magnetic material is applied to the concave wall surface in the fourth engaging portion before the convex portion contacts the concave wall surface in the third engaging portion. The parts touch. As a result, since the collision between the concave portion and the convex portion at the third engagement portion is prevented, wear of the concave portion and the convex portion at the third engagement portion can be suppressed.

  In a preferred aspect, the concave portion of the second engaging portion or the fourth engaging portion and the corner portion of the convex portion are chamfered.

  By adopting such a configuration, in the second engaging portion or the fourth engaging portion, the area of the surface that receives the circumferential force between the concave portion and the convex portion is increased, so that wear when the concave portion and the convex portion are in contact with each other is increased. Can be suppressed.

  In a preferred aspect, the number of the second engaging portion or the fourth engaging portion is greater than the number of the first engaging portion or the third engaging portion.

  As described above, the second engagement is more tight in the circumferential engagement in the second engagement portion or the fourth engagement portion than in the circumferential engagement in the first engagement portion or the third engagement portion. The concave part and the convex part of the joint part or the fourth engaging part are more likely to collide than those of the first engaging part or the third engaging part. By increasing the number of the second engaging portion or the fourth engaging portion that is likely to collide more than the first engaging portion or the third engaging portion that is difficult to collide, the second engaging portion or the fourth engaging portion The force applied to the portion can be dispersed, and wear in the second engagement portion and the fourth engagement portion can be suppressed. As a result, the collision of the concave portion and the convex portion of the first engaging portion or the third engaging portion is less likely to occur, and wear in the first engaging portion or the third engaging portion can be more reliably suppressed.

  According to the present invention, the rotation of the end plate relative to the rotor core is further suppressed without applying an excessively large force from the axial direction outside the end plate, as compared to a rotating electrical machine rotor that uses an end plate that does not include a magnetic part. can do.

It is a disassembled perspective view of a rotary electric machine rotor. It is an axial sectional view of a rotating electrical machine rotor. FIG. 3 is a schematic AA cross-sectional view in FIG. 2. It is the B section enlarged view of FIG. It is a cross-sectional view around the caulking side end plate in the second embodiment. It is the C section enlarged view of FIG. It is a figure which shows another example of an engaging part. It is an axial sectional view showing another example of a rotating electrical machine rotor.

  The first embodiment will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a rotor 10 of a rotating electrical machine, and FIG. 2 is an axial sectional view of the rotor 10. The rotor 10 is used as a motor or a generator together with a stator (not shown).

  The rotor shaft 12 has a shaft body 16 with which the rotor core 14 is fitted, and a flange 18 is provided at one end of the shaft body 16. The rotor core 14 has a substantially annular shape or a cylindrical shape, and the shaft main body 16 is inserted into a space inside the cylinder, and is fitted to the shaft main body 16. A cylindrical surface of the shaft body 16 facing the inner peripheral surface of the rotor core 14 is referred to as a shaft outer peripheral surface 20. A concave first key groove 22 is formed on the outer peripheral surface 20 of the shaft so as to extend parallel to the rotation axis L of the rotor 10 and on the radially inner peripheral side. Two first key grooves 22 are formed at positions 180.degree. Rotationally symmetric about the rotation axis L.

  The rotor core 14 is formed by laminating thin electromagnetic steel plates. The rotor core 14 is formed with a magnet mounting hole 26 that penetrates along the axial direction and accommodates the permanent magnet 24. The two adjacent magnet mounting holes 26 are inclined with respect to the radial direction so as to be arranged in a substantially V shape when viewed in the axial direction. A plurality of magnet mounting holes 26 are provided at equal intervals in the circumferential direction of the end surface of the rotor core 14, and have a longer hole-shaped opening than the permanent magnet 24.

  The permanent magnet 24 is inserted into the magnet mounting hole 26 and arranged in a substantially V shape to form one magnetic pole. A plurality of the rotor cores 14 are provided at equal intervals in the circumferential direction of the end surface of the rotor core 14. The permanent magnet 24 has a rectangular parallelepiped shape having a wide side surface and a narrow side surface, and has substantially the same length as the axial length of the rotor core 14. Further, the magnet end face is exposed to the outside of the rotor core 14.

  A core-side key protrusion 30 is provided at a position corresponding to the first key groove 22 of the shaft outer peripheral surface 20 on the core inner peripheral surface 28 which is the inner peripheral surface of the rotor core 14. Since the first key groove 22 and the core-side key protrusion 30 are engaged, the rotation of the rotor core 14 with respect to the rotor shaft 12 is prevented.

  In the direction of the rotational axis L, end plates 32, 34 are disposed on both ends of the rotor core 14 so as to be fitted into the shaft body 16. In a state where the rotor core 14 and the end plates 32 and 34 are laminated, the rotor core 14 and the end plates 32 and 34 are fixed to the rotor shaft 12 by caulking the end of the shaft body 16 opposite to the flange 18. The caulked portion of the shaft body 16 is referred to as a caulking portion 36. Further, the end plate on the flange 18 side is referred to as a flange end plate 32, and the opposite end plate is referred to as a caulking end plate 34. The caulking part may caulk the inner circumference of the caulking side end plate 34 over the entire circumference, or may caulse a plurality of places. Further, the axial lengths of the end plates 32 and 34 are shorter than the axial length of the rotor core 14.

  The flange 18 has a stepped configuration, and a large-diameter portion almost the same diameter as the flange-side end plate 32 and a small-diameter portion smaller in diameter than the flange-side end plate 32 are arranged in order from the outside in the axial direction. Two key grooves (not shown) are provided on the outer peripheral surface of the small diameter portion of the flange 18. On the other hand, two flange-side key projections 38 are provided on the inner periphery of the flange-side end plate 32, engage with the key grooves on the outer peripheral surface of the small-diameter portion of the flange 18, and the flange-side end plate 32 is prevented from rotating. .

  The caulking side end plate 34 has substantially the same shape as the rotor core 14 in a cross section perpendicular to the rotation axis L, and includes a first plate 40 (nonmagnetic body portion) made of a nonmagnetic material such as stainless steel or aluminum, and a magnetic material. The second plate 42 (magnetic part) made of, for example, iron is used.

  FIG. 3 is a schematic AA cross-sectional view in FIG. As already described, two first key grooves 22 are provided on the shaft outer peripheral surface 20 at positions that are rotationally symmetric with respect to the rotation axis L by 180 degrees. As shown in FIGS. 1 and 3, the first plate 40 is a substantially annular body that is fitted to the outer periphery of the rotor shaft 12. On the inner peripheral surface of the first plate 40, two first key protrusions 44 that protrude toward the inner peripheral side in the radial direction are provided at positions that are 180 degrees rotationally symmetric with respect to the rotation axis L. The first key groove 22 and the first key protrusion 44 are engaged to form a first engaging portion, thereby preventing the end plate 34 from rotating with respect to the rotor shaft 12.

  As described above, the rotation of the rotor core 14 and the end plates 32 and 34 in the circumferential direction with respect to the rotor shaft 12 is restricted by the restriction means that engages the key groove and the key protrusion.

  As shown in FIG. 1, the first plate 40 is formed with an annular recess 46 into which the second plate 42 can be fitted. The annular recess 46 is a substantially annular recess disposed concentrically with the first plate 40. Further, the annular recess 46 is provided so as to face the permanent magnet 24 when the first plate 40 is disposed on the rotor core 14. On the inner peripheral edge of the annular recess 46, four second key protrusions 48 that protrude toward the outer peripheral side in the radial direction are provided at positions that are 90 rotationally symmetric with respect to the rotation axis L. As shown in FIG. 3, the second plate 42 has an annular shape similar to the annular recess 46 made of a magnetic material. The thickness of the second plate is almost the same as the depth of the annular recess. On the inner peripheral edge of the second plate 42, four second key grooves 50 are provided at positions that are rotationally symmetric with respect to the rotation axis L by 90 degrees.

  The second plate 42 is fitted into the annular recess 46 formed in the first plate 40, and the second key protrusion 48 and the second key groove 50 are engaged to form a second engaging portion. Thus, the rotation of the second plate 42 relative to the first plate 40 is prevented. The radial width of the second plate 42 is substantially the same as the radial width of the annular recess 46 of the first plate 40, and the second plate 42 is fitted and fixed to the annular recess 46 of the first plate 40. ing. As shown in FIG. 2, the caulking side end plate 34 is fixed to the rotor shaft 12 so that the second plate 42 contacts the permanent magnet 24 provided on the rotor core 14. That is, the entire second plate 42 is covered with the first plate 40 and the end faces of the rotor core 14 and is not exposed to the outside of the rotor 10.

  When the rotor core 14 and the end plate 34 are fitted to the rotor shaft 12, the circumferential width of the first key groove 22 of the rotor shaft 12 is larger than the circumferential width of the core-side key protrusion 30 and the first key protrusion 44. When it is large or the same size, the assembling property is deteriorated. Therefore, in the present embodiment, the circumferential width of the first key groove 22 of the rotor shaft 12 is slightly larger than the circumferential width of the core side key protrusion 30 and the first key protrusion 44.

  FIG. 4 is an enlarged view of a portion B in FIG. As described above, the circumferential width D2 of the first key protrusion 44 of the first plate 40 is smaller than the circumferential width D1 of the first key groove 22 formed in the rotor shaft 12. Although not shown, the circumferential width D3 of the core-side key protrusion 30 formed on the rotor core 14 is similarly smaller than the circumferential width D1 of the first key groove 22 formed on the rotor shaft 12. Yes. In the first embodiment, the sizes of D2 and D3 are equal. On the other hand, the circumferential width D4 of the second key groove 50 formed in the second plate 42 is almost the same as or smaller than the circumferential width D5 of the second key protrusion 48, The second keyway 50 is fitted to the key protrusion 48 without any gap in the circumferential direction. That is, the relationship of (D1-D2)> (D4-D5) is established, and the rotor 10 is configured such that the circumferential engagement of the second engagement portion is tighter than the circumferential engagement of the first engagement portion. Has been. If (D1-D2)> (D4-D5) holds, D1 ≦ D2 or D4 ≧ D5 may be satisfied. In order to explain the circumferential width, in FIG. 4, a gap is clearly illustrated between the key groove and the key protrusion, but between the second key groove 50 and the second key protrusion 48. The gap may not be formed. Of course, the gap shown in FIG. 4 may be smaller.

  As described above, the movement when the rotor 10 of the rotating electric machine according to the first embodiment configured as described above rotates will be described below.

  When the rotor 10 is rotated, a three-phase alternating current is applied to a stator coil of a stator (not shown) to form a rotating magnetic field. As a result, a force in the rotation direction of the rotor 10 is applied to the rotor core 14 and the rotor core 14 rotates. When a force in the rotational direction is applied to the rotor core 14, a rotational force is similarly applied to the rotor shaft 12 fixed to the rotor core 14, and the end plates 32 and 34 fixed to the rotor shaft 12 and the rotor core 14 are also applied. In addition, a rotating force is applied to the rotor core 14, the rotor shaft 12, and the end plates 32 and 34 to rotate together.

  In the first embodiment, the second plate 42 has an annular shape. Therefore, since a single component (second plate 42) can contact a plurality of magnets arranged in the circumferential direction, it is not necessary to provide a component for each magnet, and the number of components can be minimized. Furthermore, the weight balance of the caulking side end plate 34 is deteriorated, and the occurrence of vibration during rotation can be suppressed.

  Since the length of the end plate 34 in the rotation axis L direction is shorter than the length of the rotor shaft 12 in the rotation axis L direction, the contact area between the end plate 34 and the rotor shaft 12 is the contact between the rotor core 14 and the rotor shaft 12. It becomes smaller than the area. Further, the end plate 34 and the rotor core 14 are both fixed to the rotor shaft 12 by shaft fitting and engagement (key engagement) by a key groove and a key protrusion.

  Therefore, the difference in fixing force between the end plate 34 and the rotor core 14 with respect to the rotor shaft 12 is proportional to the contact area, and the fixing force of the end plate 34 with respect to the rotor shaft 12 is the fixing force of the rotor core 14 with respect to the rotor shaft 12. Smaller than.

  Therefore, in order to increase the fixing force of the end plate 34, it is conceivable to tighten the shaft fit between the end plate 34 and the rotor shaft 12. However, when the shaft fit is tightened, there arises a problem that the assemblability deteriorates. Therefore, it is difficult to firmly fix the end plate 34 to the rotor shaft 12 only by shaft fitting and key engagement. Therefore, when the rotor 10 rotates at a high speed, even though the rotor core 14 and the rotor shaft 12 can rotate together, the end plate 34 and the rotor shaft 12 cannot rotate together ( The end plate may slide with respect to the rotor shaft 12). As a result, the end plate may rotate with respect to the rotor core 14.

  In the rotor 10 according to the present embodiment, not only the end plate 34 is fixed to the rotor shaft 12 but also the end plate 34 is pressed against the rotor core 14 by using the caulking portion 36, and the mechanical friction force between the two is obtained. By raising, the end plate 34 is also fixed to the rotor core 14. However, in order to fix the end plate 34 to the rotor core 14 more firmly, it is necessary to apply an excessively large force to the end plate 34 from the outside of the end plate 34 in the rotation axis L direction. The load was heavy. When the mechanical load increases, new problems such as a decrease in the life of the end plate 34 and an increase in cost for improving the mechanical strength of the end plate 34 occur. That is, it has been difficult to reliably suppress the rotation of the end plate 34 with respect to the core only by shaft fitting and key engagement.

  Therefore, in the rotor 10 according to the present embodiment, as shown in FIG. 2, the end plate 34 is positioned relative to the rotor shaft 12 so that the second plate 42 made of a magnetic material contacts the permanent magnet 24 provided on the rotor core 14. Fixed. In this case, the second plate 42 is attracted to the permanent magnet 24 by magnetic force and fixed to the rotor core 14, and rotates integrally with the rotor core 14. The first plate 40 fixed to the second plate 42 is similarly fixed to the rotor core 14 and rotates integrally with the rotor core 14. That is, according to the present embodiment, the force for fixing the end plate 34 to the rotor core 14 can be improved without applying an excessive force in the direction of the rotation axis L from the outside of the end plate 34. The rotation of the end plate 34 can be effectively suppressed.

  As described above, in the present embodiment, the second key groove 50 and the second key protrusion 48 are not fitted to each other at the first engagement portion formed by the first key groove 22 and the first key protrusion 44. The rotor 10 is configured so that the fitting at the formed second engagement portion is tight, that is, the relationship of (D1-D2)> (D4-D5) is established.

  Since the second key groove 50 is smaller than the second key protrusion 48, both are fitted with no gap. Therefore, the first plate 40 rotates integrally with the rotor core 14 together with the second plate 42. However, due to secular change or the like, the second key protrusion 48 may be worn, and a circumferential gap may be formed between the second key groove 50 and the second key protrusion 48. In consideration of assembly, it is also conceivable to provide a circumferential clearance between the second key groove 50 and the second key protrusion 48 in advance.

  In such a case, the rotor core 14 fixed to the rotor shaft 12 and the second plate 42 fixed to the rotor core 14 by magnetic force rotate together, but the second plate 42 and the first plate 40 Until contact is made, the first plate 40 does not rotate integrally. Therefore, although the rotor core 14, the second plate 42, and the rotor shaft 12 rotate together, only the first plate 40 is within the range of the circumferential clearance (D4-D5). The rotor core 14 and the rotor shaft 12 rotate relative to each other.

  Even in such a case, if (D1-D2)> (D4-D5), the wall surface of the first key groove 22 in the first engagement portion formed by the first key groove 22 and the first key protrusion 44 is used. In the second engaging portion formed by the second key protrusion 48 and the second key groove 50 before the first key protrusion 44 contacts, the second key protrusion 48 is formed on the wall surface of the second key groove 50. Contact. As a result, collision between the first key groove 22 and the first key protrusion 44 at the first engagement portion is prevented, and wear at the first engagement portion can be suppressed. Wear of the first engaging portion, that is, wear of the rotor shaft 12 may lead to a decrease in power transmission performance to other drive transmission systems connected to the rotor shaft 12. As a result, the power performance of the vehicle may be reduced. Therefore, in the first engagement portion and the second engagement portion, it is necessary to suppress the wear at the first engagement portion even if the wear at the second engagement portion is allowed.

  Further, the number of the second engaging portions is larger than the number of the first engaging portions.

  The rotor shaft 12, the rotor core 14, and the second plate 42 fixed to the rotor core 14 by magnetic force rotate integrally, and the second plate 42 contacts the first plate 40 in the second engagement portion, thereby causing the first. The plate 40 also rotates integrally. However, wear occurs in the second engagement portion, and the circumferential gap (D4-D5) between the second key protrusion 48 and the second key groove 50 is the first key protrusion 44 and the first key groove 22. Is larger than the circumferential gap (D2-D1) between the first plate 40 and the second plate 42 before the first plate 40 and the second plate 42 come into contact with each other. The first key protrusion 44 of the plate 40 comes into contact with the first key groove 22 of the rotor shaft 12. That is, when wear progresses in the second engagement portion, wear occurs in the first engagement portion. Therefore, in order to suppress wear due to friction at the first engagement portion, it is necessary to suppress wear at the second engagement portion.

  Therefore, by increasing the number of the second engaging portions more than the number of the first engaging portions, the force applied to the second engaging portions is distributed as compared with the case where the number of the first engaging portions is less than or equal to the number. The wear at the second engaging portion is suppressed.

  Similarly to increasing the number of second engaging portions and dispersing the force applied to the second engaging portions, the rotor shaft 12 and the first plate 40 are processed to increase the number of first engaging portions. Then, it can be considered that the force applied to the first engaging portion is dispersed to suppress wear in the first engaging portion. However, since the rotor shaft 12 is manufactured to have extremely high rigidity so that twisting does not occur when the rotor 10 rotates, the machining is not easy, and increasing the number of first engaging portions increases the cost. It will lead to. Therefore, generation | occurrence | production of the wear in a 1st engaging part is suppressed by suppressing the number of 1st engaging parts to the minimum, and increasing the number of 2nd engaging parts.

  Next, a second embodiment will be described with reference to FIGS. FIG. 5 is a transverse sectional view around the caulking side end plate, and FIG. 6 is an enlarged view of a portion C in FIG.

  As shown in FIG. 5, the second embodiment is different from the first embodiment in the shape of the second plate 42. In the present embodiment, the first plate 40 is provided with a non-annular storage recess 52. More specifically, the substantially fan-shaped storage recesses 52 are provided in the same number as the number of magnetic poles formed by the permanent magnets 24 provided in the rotor core 14, and a plurality of storage recesses 52 are equally spaced in the circumferential direction of the first plate 40. Is provided. Unlike the first embodiment, no keyway is provided on the outer circumference of the storage recess 52. The shape of the second plate 42 is also a fan shape substantially similar to the storage recess 52, and the thickness thereof is substantially the same as the depth of the storage recess 52. The caulking side end plate 34 in the second embodiment is formed by fitting the second plate 42 into the housing recess 52 of the first plate 40.

  Thus, by making the second plate 42 into a non-annular shape, the first plate 40 and the second plate 42 do not need to be key-engaged as in the first embodiment. On the other hand, it can suppress that a 2nd plate moves to the circumferential direction.

  FIG. 6 is an enlarged view of a portion C in FIG. As shown in FIG. 5, as in the first embodiment, the first key protrusion 44 formed on the first plate 40 has a circumferential width E1 of the first key groove 22 formed on the rotor shaft 12. The circumferential width E2 is small. Although not shown, the circumferential width E3 of the core-side key protrusion 30 formed on the rotor core 14 is similarly smaller than the circumferential width E1 of the first key groove 22 formed on the rotor shaft 12. . In the present embodiment, the circumferential widths of E2 and E3 are equal.

  On the other hand, the length E4 of the inner circumferential side of the storage recess 52 formed in the first plate 40 is almost the same as the length E5 of the inner circumferential side of the second plate 42. E4 is shorter than E5. The second plate 42 is fitted in the housing recess 52 of the first plate 40 with almost no gap. That is, the rotor 10 is configured so that the relationship of (E1-E2)> (E4-D5) is established. If (E1-E2)> (E4-E5) holds, E1 ≦ E2 or E4 ≧ E5 may be satisfied. In order to explain the circumferential width, in FIG. 6, the gap between the first key groove 22 and the first key protrusion 44 and the gap between the storage recess 52 and the second plate 42 are clearly illustrated. Although shown, the clearance gap between the accommodation recessed part 52 and the 2nd plate 42 does not need to be formed. Of course, the gap shown in FIG. 6 may be smaller.

  The movement when the rotor 10 of the second embodiment configured as described above rotates will be described below.

  In the rotor 10 according to the second embodiment, as in the first embodiment, the second plate 42 made of a magnetic material is caulked to the rotor shaft 12 so that the second plate 42 contacts the permanent magnet 24 provided on the rotor core 14. 34 is fixed. Thereby, since a magnetic attraction force is generated between the second plate made of a magnetic material and the permanent magnet 24, the force for fixing the caulking side end plate 34 to the rotor core 14 can be improved. That is, as in the first embodiment, the force for fixing the caulking side end plate 34 to the rotor core 14 can be improved without applying an excessive force in the direction of the rotation axis L from the outside of the caulking side end plate 34. It is possible to effectively suppress the rotation of the end plate relative to the core.

  Further, as shown in FIG. 5, the rotor 10 is configured so that the relationship of (E1-E2)> (E4-E5) is established.

  Similarly to the first embodiment, when a circumferential gap is generated between the first plate 40 and the second plate 42 due to aging or the like, the rotor core 14 fixed to the rotor shaft 12 is used. The second plate 42 fixed to the rotor core 14 by magnetic force rotates as a unit, but the first plate 40 does not rotate as a unit until the second plate 42 contacts the first plate 40. Therefore, although the rotor core 14, the second plate 42, and the rotor shaft 12 rotate as a unit, the first plate 40 may not rotate as a unit.

  Even in such a case, as long as (E1-E2)> (E4-E5), the wall surface of the first key groove 22 in the first engagement portion constituted by the first key groove 22 and the first key protrusion 44 is used. Before the first key protrusion 44 comes into contact with the storage recess 52 of the first plate 40, the second engagement portion configured by fitting the second plate 42 into the storage recess 52 wall surface Two plates 42 come into contact. As a result, collision between the first key groove 22 and the first key protrusion 44 at the first engagement portion is prevented, and wear at the first engagement portion can be suppressed.

  In the first embodiment, the shape of the key groove and the key protrusion is a rectangular parallelepiped, but the corners of the key groove and the key protrusion may be chamfered as shown in FIG. 7, for example. Similarly, in the second embodiment, the storage recess and the corner of the second plate 42 may be chamfered.

  By chamfering, the contact area in the circumferential direction between the keyway and the key projection can be increased, and the collision force can be further dispersed, so that wear due to contact between the keyway and the key projection can be further suppressed. it can.

  In the first and second embodiments, the second plate 42 is provided so as to contact the permanent magnet 24. However, if the second plate is provided at a position facing the permanent magnet 24, FIG. As shown in FIG. 2, the second plate may be provided inside the first plate.

  Further, in the first and second embodiments, the first key groove 22 is formed on the rotor shaft 12 and the key protrusion is formed on the first plate 40 and the rotor core 14, but the key protrusion is provided on the rotor shaft 12, A keyway may be provided in the first plate 40. Of course, in the first embodiment, the second plate 42 may be provided with a key protrusion, and the first plate 40 may be provided with a key groove.

  In the first and second embodiments, only the caulking end plate 34 is composed of the first plate 40 made of a nonmagnetic material and the second plate 42 made of a magnetic material. The plate 32 may have the same configuration.

  In the second embodiment, the non-annular second plate has substantially trapezoidal magnetic bodies arranged at equal intervals in the circumferential direction. However, the present invention is not limited to this. For example, the second plate may be an octagonal annular shape, or quadrangular magnetic bodies may be arranged at equal intervals in the circumferential direction. Moreover, the structure of the rotor 10 demonstrated so far is an example, and may be changed suitably. For example, as long as one or more magnetic pole pairs are provided, the number of magnetic pole pairs may be changed as appropriate. In the description so far, the magnetic pole of one rotor 10 is constituted by one permanent magnet 24 having a rectangular cross section. However, the number and configuration (shape) of the permanent magnets 24 constituting the magnetic poles of the rotor 10 may be changed as appropriate. For example, the magnetic pole of the rotor 10 may be composed of a permanent magnet 24 having a substantially arc-shaped cross section.

DESCRIPTION OF SYMBOLS 10 Rotor, 12 Rotor shaft, 14 Rotor core, 16 Shaft body, 18 Flange, 20 Shaft outer peripheral surface, 22 1st keyway, 24 Permanent magnet, 26 Magnet mounting hole, 28 Core inner peripheral surface, 30 Core side key protrusion, 32 34 End plate, 36 Caulking portion, 38 Flange side key projection, 40 1st plate, 42 2nd plate, 44 1st key projection, 46 Annular recess, 48 2nd key projection, 50 2nd keyway, 52 Storage recess .

Claims (9)

A rotor shaft;
A rotor core fixed to the outer periphery of the rotor shaft;
A magnet installed in a magnet mounting hole provided so as to penetrate the rotor core in the axial direction;
One or more end plates fixed to at least one of axial end portions of the rotor core;
In the rotary electric machine rotor with
The end plate includes a nonmagnetic part made of a nonmagnetic material and a magnetic part made of a magnetic material,
The rotating electrical machine rotor, wherein the magnetic body portion is provided at a position facing the magnet in the axial direction and inside the nonmagnetic body, and is fixed to the nonmagnetic body portion. A rotating electrical machine rotor according to claim 1,
The rotating electrical machine rotor, wherein the magnetic body portion is in contact with an axial end surface of the rotor core. A rotating electrical machine rotor according to claim 1 or 2,
In the rotating electrical machine rotor, the magnetic body portion is entirely surrounded by the axial end surface of the rotor core and the nonmagnetic body portion or by the nonmagnetic body portion. A rotating electrical machine rotor according to any one of claims 1 to 3,
The rotating electrical machine rotor according to claim 1, wherein the magnetic body portion has an annular shape arranged concentrically with the rotor shaft. A rotating electrical machine rotor according to any one of claims 1 to 3,
The rotating electrical machine rotor according to claim 1, wherein there are a plurality of the magnetic parts, and the magnetic parts are distributed concentrically with the rotor shaft. A rotating electrical machine rotor according to claim 4,
A concave portion formed in one of the rotor shaft and the end plate and having a concave shape in the radial direction and a convex portion formed in the other and having a convex shape in the radial direction are engaged in the radial direction. A first engaging portion to be formed;
A concave portion formed in one of the magnetic body portion and the non-magnetic body portion and having a concave shape in the radial direction, and a convex portion formed in the other and having a convex shape in the radial direction are engaged in the radial direction. A second engagement portion formed by
With
The rotating electrical machine rotor characterized in that the circumferential fitting in the second engaging portion is tighter than the circumferential fitting in the first engaging portion. In the rotating electrical machine rotor according to claim 5,
A concave portion formed in one of the rotor shaft and the end plate and having a concave shape in the radial direction and a convex portion having a convex shape in the radial direction when viewed from the axial direction formed in the other are engaged in the radial direction. A third engaging portion formed by
A fourth engagement portion formed by engaging the magnetic body portion in a recess provided in the non-magnetic body portion;
With
The rotating electrical machine rotor characterized in that the circumferential fitting in the fourth engaging portion is tighter than the circumferential fitting in the third engaging portion. A rotary electric machine rotor according to claim 6 or 7,
A rotating electrical machine rotor, wherein the concave portion and the convex portion of the second engaging portion or the fourth engaging portion are chamfered. A rotary electric machine rotor according to claim 6 or 7,
The number of the second engaging part or the fourth engaging part is larger than the number of the first engaging part or the third engaging part.

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