JP6801282B2 - Rotating electric rotor - Google Patents

Description

The present invention relates to a rotary electric rotor having a structure in which a permanent magnet is mounted in a rotor core.

As a rotor configuration of a motor or generator (rotary electric machine), a rotor core provided with a permanent magnet, an end plate for preventing the permanent magnet from popping out from the end of the rotor core, and a rotor penetrating the rotor core and the end plate. A configuration with 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 the key groove provided on the rotor shaft is engaged with the key protrusion provided on the rotor core to prevent slippage in the rotational direction. ..

Japanese Unexamined Patent Publication No. 2005-184966

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 together even though 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 to fix the end plate so as to press it against the rotor core, that is, an axial force is applied from the outside of the end plate to the end plate. May be fixed to the rotor core. By pressing the end plate against the rotor core, the friction between the two increases and the rotation of the end plate with respect 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. It is also possible to fix the end plate to the rotor shaft using a key and a keyway, but the end plate is thin and not strong enough, and a large force may be applied to the key engaging portion. ..

Therefore, an object of the present invention is to suppress the rotation of the end plate with respect to the rotor core in the rotary electric rotor without applying an excessively large force to the end plate.

The rotary electric 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, and the rotor core. In a rotary electric rotor equipped with one or more end plates attached to at least one of both axial ends and always in contact with the axial end faces of the rotor core , the end plates are made of a non-magnetic material. The non-magnetic material portion includes a non-magnetic material portion and a magnetic material portion made of a magnetic material, and the magnetic material portion is provided at a position facing the magnet in the axial direction and inside the non-magnetic material portion , and is provided on the non-magnetic material portion. characterized in that it is engaged in the circumferential direction against.

With such a configuration, the rotation of the end plate with respect to the rotor core can be regulated by using the magnetic force acting between the magnet provided on 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 with respect to the rotor core can be suppressed as compared with the rotary electric rotor using the end plate that does not include the magnetic material portion.

In a preferred embodiment, the magnetic material portion is in contact with the axial end face of the rotor core.

With such a configuration, the magnetic force acting between the magnetic material portion and the magnet can be increased as compared with the case where the magnetic material portion is not in contact with the end face of the rotor core. As a result, the rotation of the end plate with respect to the rotor core can be more regulated as compared with the case where the magnetic material portion is not in contact with the end face of the rotor core.

In a preferred embodiment, the magnetic material portion is characterized in that the entire magnetic material portion is surrounded by the axial end surface of the rotor core and the non-magnetic material portion, or by the non-magnetic material portion.

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

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

With such a configuration, it is possible to suppress the weight balance of the end plate from being lost while minimizing the number of magnetic material portions when the magnetic material portion is provided on the end plate.

In a preferred embodiment, there are a plurality of the magnetic material portions, and the magnetic material portions are arranged concentrically with the rotor shaft in a dispersed manner.

With such a configuration, it is possible to prevent the magnetic material portion from moving in the circumferential direction in the non-magnetic material portion as compared with the case where the magnetic material portion has an annular shape.

In a preferred embodiment, a concave portion formed on one of the rotor shaft and the end plate and having a concave shape in the radial direction and a convex portion formed on the other side and having a convex shape in the radial direction are formed in the radial direction. A first engaging portion formed by engaging, a concave portion formed in one of the magnetic material portion and the non-magnetic material portion and having a concave shape in the radial direction, and a concave portion formed in the other and having a diameter. A second engaging portion formed by engaging a convex portion that is convex in the direction in the radial direction is provided, and the second engaging portion is formed by fitting in the circumferential direction in the first engaging portion. It is characterized in that the fitting in the circumferential direction in the portion is tighter.

With such a configuration, the rotor shaft, the rotor core, and the magnetic material portion rotate integrally, while the non-magnetic material portion rotates in the circumferential direction with respect to the rotor core and the rotor shaft, so that the first engagement occurs. When the convex portion rotates in the concave portion in the portion and the second engaging portion, the convex portion is formed on the concave wall surface in the second engaging portion before the convex portion contacts the concave wall surface in the first engaging portion. Contact. As a result, the collision between the concave portion and the convex portion at the first engaging portion is prevented, so that the wear of the concave portion and the convex portion at the first engaging portion can be suppressed.

In a preferred embodiment, a concave portion formed on one of the rotor shaft and the end plate and having a concave shape in the radial direction, and a convex portion formed on the other side and having a convex shape in the radial direction when viewed from the axial direction are formed. A third engaging portion formed by engaging in the radial direction, and a fourth engaging portion formed by engaging the magnetic material portion in a recess provided in the non-magnetic material portion. It is characterized in that the fitting in the circumferential direction at the fourth engaging portion is tighter than the fitting in the circumferential direction at the third engaging portion.

With such a configuration, the rotor shaft, the rotor core, and the magnetic material portion rotate integrally, while the non-magnetic material portion rotates in the circumferential direction with respect to the rotor core and the rotor shaft, so that the third engagement occurs. When the convex portion rotates in the concave portion in the portion and the fourth engaging portion, the magnetic material is formed on 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 come into contact. As a result, the collision between the concave portion and the convex portion at the third engaging portion is prevented, so that the wear of the concave portion and the convex portion at the third engaging portion can be suppressed.

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

With such a configuration, in the second engaging portion or the fourth engaging portion, the area of the surface that receives the force in the circumferential direction between the concave portion and the convex portion increases, so that the wear occurs when the concave portion and the convex portion come into contact with each other. Can be suppressed.

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

As described above, the circumferential fit at the second or fourth engaging portion is tighter than the circumferential fit at the first or third engaging portion, the second engagement. The concave and convex portions of the joint or the fourth engaging portion are more likely to collide than those of the first engaging portion or the third engaging portion. 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 is engaged. The force applied to the portions can be dispersed, and wear in the second engaging portion and the fourth engaging portion can be suppressed. As a result, 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, as compared with a rotary electric rotor using an end plate that does not contain a magnetic material, the rotation of the end plate with respect to the rotor core is further suppressed without applying an excessively large force from the axial direction on the outside of the end plate. can do.

It is an exploded perspective view of a rotary electric rotor. It is sectional drawing in the axial direction of a rotary electric rotor. FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG. It is an enlarged view of part B of FIG. It is sectional drawing around the caulking side end plate in 2nd Embodiment. FIG. 5 is an enlarged view of part C in FIG. It is a figure which shows another example of the engaging part. It is an axial sectional view which shows another example of a rotary electric rotor.

Hereinafter, the first embodiment will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a rotor 10 of a rotary electric 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 to which the rotor core 14 is shaft-fitted, and a flange 18 is provided at one end of the shaft body 16. The rotor core 14 has a substantially annular or cylindrical shape, and the shaft body 16 is inserted into the space inside the cylinder and is axially fitted to the shaft body 16. The 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. The outer peripheral surface 20 of the shaft extends in parallel with the rotation axis L of the rotor 10 and has a concave first key groove 22 formed on the inner peripheral side in the radial direction. Two first key grooves 22 are formed at positions that are 180 degrees rotationally symmetric with respect to 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 provided so as to be inclined with respect to the radial direction so as to be arranged in a substantially V shape in the axial direction. Further, a plurality of magnet mounting holes 26 are provided at equal intervals in the circumferential direction of the end face of the rotor core 14, and have elongated hole-shaped openings larger than those of 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. Further, a plurality of rotor cores 14 are provided at equal intervals in the circumferential direction of the end faces. The permanent magnet 24 has an axially long 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. The magnet end face is exposed to the outside of the rotor core 14.

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

In the direction of the rotation axis L, end plates 32 and 34 are arranged on both ends of the rotor core 14 so as to be axially fitted to the shaft body 16. The rotor core 14 and the end plates 32, 34 are fixed to the rotor shaft 12 by crimping the end of the shaft body 16 opposite to the flange 18 in a state where the rotor core 14 and the end plates 32, 34 are laminated. The crimped portion of the shaft body 16 is referred to as a crimped portion 36. Further, the end plate on the flange 18 side is referred to as a flange side end plate 32, and the end plate on the opposite side is referred to as a caulking side end plate 34. The caulking portion may be caulked over the entire inner circumference of the caulking side end plate 34, or may be caulked at a plurality of locations. Further, the axial lengths of the end plates 32 and 34 are shorter than the axial lengths of the rotor core 14.

The flange 18 has a stepped structure, and a large diameter portion having substantially the same diameter as the flange side end plate 32 and a small diameter portion having a diameter smaller than that of 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 flange 18 small diameter portion. On the other hand, two flange-side key protrusions 38 are provided on the inner circumference of the flange-side end plate 32, and engage with the key groove on the outer peripheral surface of the flange 18 small diameter portion to prevent the flange-side end plate 32 from rotating. ..

The caulking side end plate 34 has substantially the same shape as the rotor core 14 in a cross section orthogonal to the rotation axis L, and has a non-magnetic material, for example, a first plate 40 (non-magnetic material portion) made of stainless steel or aluminum, and a magnetic material. For example, it is composed of a second plate 42 (magnetic material portion) made of iron.

FIG. 3 is a schematic cross-sectional view taken along the line AA in FIG. As described above, the outer peripheral surface 20 of the shaft is provided with two first key grooves 22 at positions symmetrical 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 fitted on the outer periphery of the rotor shaft 12. The inner peripheral surface of the first plate 40 is also provided with two first key protrusions 44 protruding toward the inner peripheral side in the radial direction at positions that are 180 degrees rotationally symmetric with respect to the rotation axis L. By engaging the first key groove 22 and the first key protrusion 44 to form the first engaging portion, the rotation of the end plate 34 with respect to the rotor shaft 12 is prevented.

As described above, the rotor core 14 and the end plates 32 and 34 are restricted from rotating in the circumferential direction with respect to the rotor shaft 12 by the regulating means for engaging 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 arranged 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 arranged on the rotor core 14. On the inner peripheral edge of the annular recess 46, four second key protrusions 48 projecting toward the outer peripheral side in the radial direction are provided at positions symmetrical with respect to the rotation axis L by 90 rotations. Further, 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 90-degree rotationally symmetric with respect to the rotation axis L.

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 with each other to form the second engaging portion. Therefore, the rotation of the second plate 42 with respect to the first plate 40 is prevented. Further, 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. Then, as shown in FIG. 2, the caulking side end plate 34 is fixed to the rotor shaft 12 so that the second plate 42 comes into contact with the permanent magnet 24 provided on the rotor core 14. That is, the entire second plate 42 is covered with the end faces of the first plate 40 and 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 axially 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. If it is large or the same size, the assembling property will deteriorate. Therefore, in the present embodiment, the circumferential width of the first key groove 22 of the rotor shaft 12 is formed to be larger than the circumferential width of the core side key protrusion 30 and the first key protrusion 44, although it is slight.

FIG. 4 is an enlarged view of part B of 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 also smaller than the circumferential width D1 of the first key groove 22 formed on the rotor shaft 12. There is. 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 size as or smaller than the circumferential width D5 of the second key protrusion 48, and is the second. The second key groove 50 is fitted to the key protrusion 48 without a gap in the circumferential direction. That is, the relationship of (D1-D2)> (D4-D5) is established, and the rotor 10 is configured so that the circumferential fitting of the second engaging portion is tighter than the circumferential fitting of the first engaging portion. Has been done. If (D1-D2)> (D4-D5) holds, D1 ≦ D2 or D4 ≧ D5 may be satisfied. In addition, in order to explain the circumferential width, the gap between the key groove and the key protrusion is clearly shown in FIG. 4, but there is a gap between the second key groove 50 and the second key protrusion 48. No gaps may be formed. Of course, the gap shown in FIG. 4 may be smaller.

The movement when the rotor 10 of the rotary electric machine of the first embodiment configured as described above rotates is described below.

When rotating the rotor 10, a three-phase alternating current is applied to the 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 also applied to the rotor shaft 12 fixed to the rotor core 14, and the end plates 32, 34 fixed to the rotor shaft 12 and the rotor core 14 are further applied. A rotating force is also applied to the rotor core 14, the rotor shaft 12, and the end plates 32 and 34 to rotate as one.

In the first embodiment, the second plate 42 has an annular shape. Therefore, since a single component (second plate 42) can be in contact with 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. Further, the weight balance of the caulking side end plate 34 is deteriorated, and it is possible to suppress the occurrence of vibration during rotation.

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 is smaller than the area. Further, both the end plate 34 and the rotor core 14 are fixed to the rotor shaft 12 by shaft fitting and engagement by key grooves and key protrusions (key engagement).

Therefore, the difference in the 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. Is smaller than

Therefore, in order to increase the fixing force of the end plate 34, it is conceivable to tighten the shaft fitting between the end plate 34 and the rotor shaft 12. However, if the shaft fits tightly, there arises a problem that the assembling property deteriorates. Therefore, it has been 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 high speed, the rotor core 14 and the rotor shaft 12 can rotate integrally, but the end plate 34 and the rotor shaft 12 cannot rotate integrally ( The end plate may slip 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 of 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 to apply a mechanical frictional force between the two. By raising it, 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 in the rotation axis L direction of the end plate 34, and the machine of the end plate 34 The target load was heavy. When the mechanical load becomes large, 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 was difficult to reliably suppress the rotation of the end plate 34 with respect to the core only by the shaft fitting and the key engagement.

Therefore, in the rotor 10 of the present embodiment, as shown in FIG. 2, the end plate 34 refers to the rotor shaft 12 so that the second plate 42 made of a magnetic material comes into contact with the permanent magnet 24 provided on the rotor core 14. It is fixed. In this case, the second plate 42 is attracted to the permanent magnet 24 by a magnetic force, fixed to the rotor core 14, and rotates integrally with the rotor core 14. Then, the first plate 40 fixed to the second plate 42 is also fixed to the rotor core 14 in the same manner, 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 rotation axis L direction from the outside of the end plate 34, and the force for fixing the end plate 34 to the rotor core 14 can be improved. 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 used rather than the fitting at the first engaging 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 engaging portion is tight, that is, the relationship (D1-D2)> (D4-D5) is established.

Since the second key groove 50 is smaller than the second key protrusion 48, both are fitted without a gap. Therefore, the first plate 40 rotates integrally with the rotor core 14 together with the second plate 42. However, the second key protrusion 48 may be worn due to aging or the like, and a gap in the circumferential direction may be formed between the second key groove 50 and the second key protrusion 48. Further, in consideration of assembling property, it is conceivable to provide a gap in the circumferential direction 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 integrally, but the second plate 42 and the first plate 40 The first plate 40 does not rotate as a unit until they come into contact with each other. Therefore, although the rotor core 14, the second plate 42, and the rotor shaft 12 rotate integrally, only the first plate 40 is the second plate 42 within the range of the circumferential gap (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 engaging portion formed by the first key groove 22 and the first key protrusion 44. In the second engaging portion formed by the second key protrusion 48 and the second key groove 50, the second key protrusion 48 is formed on the wall surface of the second key groove 50 before the first key protrusion 44 comes into contact with the second key protrusion 48. Contact. As a result, the collision between the first key groove 22 and the first key protrusion 44 at the first engaging portion can be prevented, and wear at the first engaging portion can be suppressed. Wear of the first engaging portion, that is, wear of the rotor shaft 12, may lead to deterioration of power transmission performance to another drive transmission system connected to the rotor shaft 12. As a result, the power performance of the vehicle may deteriorate. Therefore, in the first engaging portion and the second engaging portion, it is necessary to suppress the wear at the first engaging portion even if the wear at the second engaging 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 comes into contact with the first plate 40 at the second engaging portion, so that the first plate 42 is first. The plate 40 also rotates integrally. However, wear occurs in the second engaging portion, and a circumferential gap (D4-D5) between the second key protrusion 48 and the second key groove 50 is formed between the first key protrusion 44 and the first key groove 22. When it becomes larger than the circumferential gap (D2-D1) between the first plate 40 and the second plate 42, the first plate 40 and the second plate 42 come into contact with each other in the first engagement portion. 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 the wear progresses in the second engaging portion, the wear occurs in the first engaging portion. Therefore, in order to suppress the wear due to friction in the first engaging portion, it is necessary to suppress the wear in the second engaging portion.

Therefore, by making the number of the second engaging portions larger than the number of the first engaging portions, the force applied to the second engaging portions is dispersed as compared with the case where the number of the second engaging portions is less than or equal to the number of the first engaging portions. It is possible to suppress wear at the second engaging portion.

In the same way as increasing the number of the second engaging portions to disperse the force applied to the second engaging portions, the rotor shaft 12 and the first plate 40 are processed to increase the number of the first engaging portions. Then, it is conceivable to disperse the force applied to the first engaging portion to suppress the wear in the first engaging portion. However, since the rotor shaft 12 is manufactured so as to have extremely high rigidity so that twisting does not occur when the rotor rotates 10 times, its processing is not easy, and increasing the number of first engaging portions increases the cost. Will lead to. Therefore, by minimizing the number of the first engaging portions and increasing the number of the second engaging portions, the occurrence of wear in the first engaging portions is suppressed.

Next, the second embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view around the crimped end plate, and FIG. 6 is an enlarged view of part C of FIG.

As shown in FIG. 5, the second embodiment has a different shape of the second plate 42 from the first embodiment. In the present embodiment, the first plate 40 is provided with a non-annular storage recess 52. More specifically, the substantially fan stand-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 provided at equal intervals in the circumferential direction of the first plate 40. It is provided. Unlike the first embodiment, the key groove is not provided in the outer peripheral circle of the storage recess 52. Further, the shape of the second plate 42 is also a fan stand 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 storage recess 52 of the first plate 40.

By forming the second plate 42 into a non-annular shape in this way, the first plate does not require key engagement between the first plate 40 and the second plate 42 as in the first embodiment. On the other hand, it is possible to prevent the second plate from moving in the circumferential direction.

FIG. 6 is an enlarged view of part C of FIG. As shown in FIG. 5, similarly to the first embodiment, the first key protrusion 44 formed on the first plate 40 from the 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 also smaller than the circumferential width E1 of the first key groove 22 formed on the rotor shaft 12. .. In this embodiment, the widths of E2 and E3 in the circumferential direction are the same.

On the other hand, the length E4 of the inner peripheral side of the storage recess 52 formed in the first plate 40 is almost the same as the length E5 of the inner peripheral side of the second plate 42, and in some cases, the length E5. E4 is shorter than E5. The second plate 42 fits into the storage recess 52 of the first plate 40 with almost no gap. That is, the rotor 10 is configured so that the relationship (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 shown. As shown, the gap between the storage recess 52 and the second plate 42 may not 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 is described below.

In the rotor 10 of the second embodiment as well, as in the first embodiment, the end plate on the caulking side with respect to the rotor shaft 12 so that the second plate 42 made of a magnetic material comes into contact with the permanent magnet 24 provided on the rotor core 14. 34 is fixed. As a result, a magnetic attraction force is generated between the second plate made of the magnetic material and the permanent magnet 24, so that 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, it is possible to improve the force for fixing the caulking side end plate 34 to the rotor core 14 without applying an excessive force in the rotation axis L direction from the outside of the caulking side end plate 34. It can effectively suppress the rotation of the end plate with respect to the core.

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

Similar to the first embodiment, when a gap in the circumferential direction is generated between the first plate 40 and the second plate 42 due to aged deterioration or the like, the rotor core 14 fixed to the rotor shaft 12 The second plate 42 fixed to the rotor core 14 is rotated integrally by the magnetic force, but the first plate 40 does not rotate integrally until the second plate 42 comes into contact with the first plate 40. Therefore, even though the rotor core 14, the second plate 42, and the rotor shaft 12 rotate integrally, the first plate 40 may not rotate integrally.

Even in such a case, as long as (E1-E2)> (E4-E5), the wall surface of the first key groove 22 in the first engaging portion composed of the first key groove 22 and the first key protrusion 44. In the second engaging portion formed by fitting the second plate 42 into the storage recess 52 of the first plate 40 before the first key protrusion 44 comes into contact with the wall surface of the storage recess 52. 2 Plates 42 come into contact. As a result, the collision between the first key groove 22 and the first key protrusion 44 at the first engaging portion can be prevented, and wear at the first engaging portion can be suppressed.

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

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

Further, in the first and second embodiments, the second plate 42 is provided so as to come into contact with the permanent magnet 24, but if the second plate is provided at a position facing the permanent magnet 24, FIG. As shown in, the second plate may be provided inside the first plate.

Further, in the first and second embodiments, the rotor shaft 12 is provided with the first key groove 22, and the first plate 40 and the rotor core 14 are formed with the key protrusions. However, the rotor shaft 12 is provided with the key protrusions. 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.

Further, in the first and second embodiments, only the caulking side end plate 34 is composed of the first plate 40 made of a non-magnetic material and the second plate 42 made of a magnetic material, but the flange side end The plate 32 may have a similar configuration.

Further, as the second embodiment, in the non-annular second plate, substantially trapezoidal magnetic materials are arranged at equal intervals in the circumferential direction, but the present invention is not limited to this. For example, the second plate may have an octagonal annular shape, or quadrangular magnetic materials may be arranged at equal intervals in the circumferential direction. Further, the configuration of the rotor 10 described so far is an example, and may be changed as appropriate. For example, if the number of magnetic pole pairs is one or more, the number of magnetic pole pairs may be changed as appropriate. Further, in the description so far, the magnetic pole of one rotor 10 is composed of 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 arcuate cross section.

10 rotor, 12 rotor shaft, 14 rotor core, 16 shaft body, 18 flange, 20 shaft outer peripheral surface, 22 first key groove, 24 permanent magnet, 26 magnet mounting hole, 28 core inner peripheral surface, 30 core side key protrusion, 32 , 34 End plate, 36 Caulking part, 38 Flange side key protrusion, 40 1st plate, 42 2nd plate, 44 1st key protrusion, 46 annular recess, 48 2nd key protrusion, 50 2nd key groove, 52 Storage recess ..

Claims (9)

With the rotor shaft
A rotor core fixed to the outer circumference of the rotor shaft and
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 that are attached to at least one of the axial ends of the rotor core and are always in contact with the axial end faces of the rotor core .
In the rotary electric rotor equipped with
The end plate includes a non-magnetic material portion made of a non-magnetic material and a magnetic material portion made of a magnetic material.
The magnetic unit is rotated, characterized in that the position opposed in the axial direction to the magnet, and provided inside the non-magnetic portion, and is engaged against the non-magnetic portion in the circumferential direction Electric rotor. The rotary electric rotor according to claim 1.
The rotating electric rotor is characterized in that the magnetic material portion is in contact with the axial end surface of the rotor core. The rotary electric rotor according to claim 1 or 2.
The magnetic material portion is a rotary electric rotor, wherein the entire magnetic material portion is surrounded by an axial end surface of the rotor core and the non-magnetic material portion, or by the non-magnetic material portion. The rotary electric rotor according to any one of claims 1 to 3.
The rotating electric rotor is characterized in that the magnetic material portion has an annular shape arranged concentrically with the rotor shaft. The rotary electric rotor according to any one of claims 1 to 3.
A rotary electric rotor having a plurality of magnetic material portions and being dispersed and arranged concentrically with the rotor shaft. The rotary electric rotor according to claim 4.
By engaging the concave portion formed on one of the rotor shaft and the end plate and having a concave shape in the radial direction and the convex portion formed on the other side and having a convex shape in the radial direction in the radial direction. The first engaging part to be formed and
A concave portion formed on one of the magnetic material portion and the non-magnetic material portion and having a concave shape in the radial direction, and a convex portion formed on the other side and having a convex shape in the radial direction are engaged in the radial direction. With the second engaging part formed by
With
A rotary electric rotor, characterized in that the circumferential fit at the second engaging portion is tighter than the circumferential fit at the first engaging portion. In the rotary electric rotor according to claim 5,
A concave portion formed on one of the rotor shaft and the end plate and having a concave shape in the radial direction and a convex portion formed on the other side which is convex in the radial direction when viewed from the axial direction are engaged in the radial direction. With the third engaging part formed by
A fourth engaging portion formed by engaging the magnetic material portion in a recess provided in the non-magnetic material portion, and a fourth engaging portion.
With
A rotary electric rotor characterized in that the circumferential fit at the fourth engaging portion is tighter than the circumferential fit at the third engaging portion. The rotary electric rotor according to claim 6 or 7.
A rotary electric rotor characterized in that the concave portion and the corner portion of the convex portion of the second engaging portion or the fourth engaging portion are chamfered. The rotary electric rotor according to claim 6 or 7.
A rotary electric rotor, characterized in that the number of the second engaging portion or the fourth engaging portion is larger than the number of the first engaging portion or the third engaging portion.

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