JP2009095200A - Rotor of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable rotor of a rotary electric machine that demonstrates the characteristics of magnets sufficiently, that does not deteriorate motor characteristics, and that has permanent magnets, which are fixed so as to withstand a centrifugal force applied when rotated at high speed. <P>SOLUTION: This rotor comprises a stacked iron core 8, which is made up of a first iron core 1 and a second iron core 2 made by stacking steel plates, and a groove part formed by pinching with the first and second iron cores a steel plate 3 whose diameter is smaller than that of steel plates used for the first iron core and the second iron core; a shaft 4, which is press fitted into a hole provided in the center part of the stacked iron cores; a plurality of permanent magnets, which are arranged on the outer surface of the stacked iron cores; a protective pipe of a non-magnetic material, which is provided on the outside circumference of the plurality of permanent magnets; and a resin, which is filled in a gap formed by the stacked iron core, the permanent magnets 5, and the protective pipe 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotor of a rotating electrical machine having a permanent magnet, and more particularly to a rotor of a rotating electrical machine in which a permanent magnet is firmly fixed and held on the surface of a rotor core.

  Conventionally, a permanent magnet used for a rotor of a rotating electrical machine such as an electric motor has been fixed to the surface of the rotor core by an adhesive means such as an adhesive. However, in the method of fixing the permanent magnet to the surface of the rotor core with an adhesive, it is difficult to manage the rotor when it is manufactured. For example, when a laminated core is used for the rotor core, even if the surface of the iron core is thoroughly cleaned before applying the adhesive, a substance that inhibits the curing of the adhesive remains in the lamination gap, and this residual substance is the adhesive. It oozes out from the lamination gap during curing and inhibits the curing of the adhesive. That is, there is a problem that adhesion between the surface of the rotor core and the permanent magnet becomes insufficient, and the permanent magnet peels from the rotor core due to centrifugal force during rotation of the rotating electrical machine.

In order to solve the above problem, a rotor having a permanent magnet disposed on the surface of the rotor core, each gap between adjacent permanent magnets, and a groove provided on the rotor core surface at a position corresponding to each gap, In addition, a rotor of a synchronous motor in which an integrally molded resin member made of a resin material is filled and arranged, and each permanent magnet is fixed to the rotor core surface is disclosed (for example, see Patent Document 1).
In addition, a plurality of permanent magnets are bonded and fixed around a cylindrical or columnar iron core, and a non-magnetic cylindrical metal cover is fitted over the bonded and fixed permanent magnet to make the permanent magnet nonmagnetic. A permanent magnet type rotor covered and fixed with a metal tube is disclosed (for example, see Patent Document 2).
In addition, a permanent magnet is mounted on the outer peripheral portion of the yoke that is formed by stacking a plurality of thin iron plates into a thick cylindrical shape, and a wire is wound around the outer peripheral portion of the permanent magnet, and further, the outer peripheral portion of the wire and the permanent magnet Has disclosed a rotor in which the axial end of each is integrally molded with resin (see, for example, Patent Document 3).

JP-A-9-19091 (page 3, FIG. 2) JP-A-6-284650 (pages 3-4, FIG. 2) JP-A-3-49544 (2nd page, FIG. 2)

  In the rotor of the synchronous motor described in Patent Document 1, both end portions of the permanent magnet are fixed to the rotor core surface with a molded resin member. However, when such a rotor is used for a high torque motor or a high speed motor reaching several tens of thousands of revolutions per minute, a large centrifugal force is applied to the magnet at the time of high speed rotation. There was a problem that it could not withstand the centrifugal force and would be deformed or damaged.

Moreover, in the permanent magnet type rotor in which the permanent magnet described in Patent Document 2 is covered and fixed with a nonmagnetic metal tube, the curvature of the arc of the surface of the permanent magnet is different from the diameter of the outer peripheral surface of the rotor. The surface of the magnet is in point contact or line contact with the inner periphery of the non-magnetic metal tube, and if a centrifugal force is applied to the permanent magnet due to high-speed rotation, stress concentrates on the contact area and the non-magnetic metal tube is deformed. It is necessary to increase the thickness of the nonmagnetic metal tube.
However, if the thickness of the nonmagnetic metal tube is increased, the distance from the magnet to the stator, that is, the air gap increases and the torque decreases, and the volume of the nonmagnetic metal tube increases and loss due to eddy current during rotation There is a problem that the motor characteristics are remarkably deteriorated.

  Further, the resin-molded rotor described in Patent Document 3 is such that the permanent magnet is wound around the outer periphery with a wire, and the outer periphery of the wire and the axial end of the permanent magnet are integrally molded with resin. And fixed to the outer periphery of the yoke. In order for the permanent magnet fixed to the outer periphery of the yoke to withstand centrifugal force during high-speed rotation, it is necessary to increase the thickness of the resin that molds the outer periphery of the rotor, and the distance from the magnet to the stator, that is, the air There was a problem that the gap increased and the motor characteristics deteriorated.

  The present invention has been made to solve the above-described problems, and its purpose is to provide a permanent magnet that can sufficiently exhibit the characteristics of the magnet, does not deteriorate the motor characteristics, and can withstand the centrifugal force applied during high-speed rotation. It is an object of the present invention to provide a highly reliable rotor of a rotating electrical machine in which the above is fixed.

  A rotor of a rotating electrical machine according to the present invention includes a core provided with a first iron core and a second iron core that are provided with a groove portion in a substantially central outer peripheral portion in the axial direction and separated by the groove portion; A plurality of permanent magnets arranged on the surface, a shaft provided on the shaft portion of the iron core, a nonmagnetic material protective tube disposed on the outer periphery of the plurality of permanent magnets, an iron core, a permanent magnet, and a protective tube And a resin filled in the formed gap.

  A rotor of a rotating electrical machine according to the present invention includes a core provided with a first iron core and a second iron core that are provided with a groove portion in a substantially central outer peripheral portion in the axial direction and separated by the groove portion; A plurality of permanent magnets disposed on the surface, a shaft provided on the shaft portion of the iron core, a nonmagnetic material protective tube disposed on the outer periphery of the plurality of permanent magnets, an iron core, a permanent magnet, and a protective tube It is equipped with resin filled in the formed gap, and since the thickness of the protective tube can be reduced, it is possible to suppress torque reduction by reducing the air gap and to suppress loss due to eddy current, and to rotate Electric characteristics do not deteriorate. Furthermore, even if the protective tube is thin, it is possible to fix the permanent magnet that can withstand the centrifugal force applied to the permanent magnet during high-speed rotation, and the reliability is high.

Embodiment 1 FIG.
FIG. 1 is an exploded view of a rotor of a rotating electrical machine according to Embodiment 1 of the present invention.
FIG. 2 is a perspective view (a) of the rotor of the rotating electrical machine according to the first embodiment of the present invention, a BB cross-sectional view (b) perpendicular to the axial direction of the shaft in this perspective view, and C- They are C sectional drawing (c) and DD sectional drawing (d).
As shown in FIG. 1 and FIG. 2, the rotor 100 of the rotating electrical machine according to the present embodiment includes a first iron core 1 and a second iron core formed by laminating steel plates having polygonal shapes. A laminated core 8 formed of an iron core 2 and a disk-shaped steel plate 3 sandwiched between the first iron core 1 and the second iron core 2, and the laminated iron core 8 is provided at the center thereof. The shaft 4 is press-fitted into the hole and fixed. The polygonal side of the first iron core 1 and the polygonal side of the second iron core 2 are parallel to each other, and the first iron core 1 and the second iron core, which are the outer surfaces of the laminated iron core 8, are formed. On the sides of the polygon formed by the iron core 2, the permanent magnets 5 having a cone shape are installed at equal intervals in the circumferential direction. The polygonal steel plate forming the first iron core 1 and the second iron core 2 is provided with a magnet positioning projection 9 in the axial direction. And as shown in FIG.2 (c), the diameter of the disk shaped steel plate 3 is made smaller than the diameter of the inscribed circle of the steel plate with a polygonal shape. Therefore, a groove is formed between the first iron core 1 and the second iron core 2 in the laminated iron core 8.
A protective tube 6 made of a nonmagnetic material is disposed around the permanent magnet 5 installed on the outer surface of the laminated iron core 8. A gap formed by the laminated iron core 8, the permanent magnet 5, and the protective tube 6 is filled with a resin 7.

Simply fixing a permanent magnet with a protective tube around it, the surface of the permanent magnet is in point contact or line contact with the inner periphery of the protective tube, and stress is applied to the local area of the protective tube when the rotor of the rotating electrical machine rotates. Concentrate.
To prevent point contact or line contact between the surface of the permanent magnet and the inner periphery of the protective tube, which is the cause of stress concentration in the protective tube, a nonmagnetic metal tube is used as the protective tube. There is a structure in which a portion of the protective tube facing the groove extending in the direction is plastically deformed radially inward so that the protective tube follows the arc shape of the permanent magnet.
However, in such a structure, the strength of the plastically deformed portion of the protective tube is reduced, and it becomes difficult to firmly attach the protective tube to the permanent magnet due to the spring back after the plastic deformation, and the stress concentration is sufficient. Can not be relaxed.
In addition, since the circumference of the protective tube along the permanent magnet that has been plastically deformed is extended from the inner circumferential length of the original protective tube, it becomes weak against the force that tries to spread the protective tube to the outer circumference, Resistance to centrifugal force applied to the permanent magnet during high-speed rotation is reduced.
On the other hand, the rotor 100 of the rotating electrical machine according to the present embodiment is filled with the resin 7 in the gap formed by the laminated iron core 8, the permanent magnet 5, and the protective tube 6, so that the surface of the permanent magnet 5 The inner circumference of the protective tube 6 is not a point contact or a line contact, and it is possible to prevent stress from being concentrated on the local portion of the protective tube 6 and to prevent the strength of the protective tube 6 from being reduced.

In the present embodiment, the shape of the steel plate forming the first iron core 1 and the second iron core 2 is a polygon, but if the permanent magnet can be installed on the outer surface of the laminated iron core 8, it is limited to this shape. is not. Moreover, although the shape of the steel plate pinched | interposed between the 1st iron core 1 and the 2nd iron core 2 is made circular, it is not limited to this shape.
In the present embodiment, as shown in FIG. 2, ten permanent magnets 5 are arranged on the surface of the laminated iron core 8, but the present invention is not limited to this.
Moreover, you may provide a notch in the shaft hole of the laminated iron core 8, and the shaft 4, respectively. Providing a notch in each provides a detent for the laminated iron core 8 and facilitates positioning of the first iron core 1 and the second iron core 2.
FIG. 3 is a diagram showing another shape of permanent magnet used for the rotor of the rotating electrical machine of the present embodiment. In the present embodiment, the cross section of the permanent magnet 5 is shaped like a cone. However, the present invention is not limited to this, and a permanent magnet 51 whose surface in contact with the iron core is arcuate as shown in FIG. 3 may be used.

In the present embodiment, for example, a silicon steel plate is used as the steel plate, and the protective tube 6 made of a nonmagnetic material is made of, for example, aluminum or stainless steel and has a cylindrical shape.
FIG. 4 shows another shape of the protective tube used in the rotor of the rotating electrical machine of the present embodiment, a cylindrical protective tube (a) in which a part of the axial end is bent, and the entire axial end. It is a figure which shows the cylindrical protective tube (b) and the cup-shaped protective tube (c) which bent the periphery and provided the edge.
As shown in FIG. 4, a cylindrical protective tube 61 in which a part of an axial end portion is bent, a cylindrical protective tube 62 in which the entire circumference of the axial end portion is bent, and an edge is provided, and a cup-shaped protective tube 63 are: One end of the protective tube is machined and extends in the shaft direction, which facilitates positioning of the protective tube and prevents the protective tube from coming off. Further, the cylindrical protective tube 62 and the cup-shaped protective tube 63, which are bent at the entire circumference of the axial end portion and provided with an edge, extend in the central portion where the shaft 4 is located at the entire circumference of one end portion of the protective tube. Therefore, the resistance to the centrifugal force of the protective tube is increased.
As the resin 7, for example, PBT (polybutylene terephthalate resin), an epoxy resin, or the like is used. Further, the resin 7 may be disposed not only on the gap formed by the laminated iron core 8, the permanent magnet 5, and the protective tube 6 but also on the surface of the laminated iron core 8 in the axial direction. If it does in this way, a crack and a chip of a permanent magnet can be prevented, and scattering of a permanent magnet piece generated by a crack and a chip of a permanent magnet can be prevented.

Next, a method for manufacturing the rotor 100 of the rotating electrical machine of the present embodiment will be described.
As shown in FIGS. 1 and 2, the laminated iron core 8 in the present embodiment has two types of steel plates, a polygonal steel plate and a disc-shaped steel plate 3 that form the first iron core 1 and the second iron core 2. A shape is used.
Therefore, using a press, a steel plate having a thickness of 1 mm is punched into a polygonal shape having a magnet positioning projection and an inscribed circle having a diameter of 35 mm, and 17 steel plates having this shape are stacked, The iron core 1 is formed. Next, the punch is switched, and only one steel plate is punched out into a disk shape having an outer diameter of 30 mm. Next, the punch is switched again, the steel plate is punched into the same polygonal shape used for forming the first iron core 1, and 17 steel plates of this shape are laminated to form the second iron core 2. The punched polygonal steel plates may be connected by caulking.
Next, the shaft 4 is press-fitted into a shaft hole provided in the center of the laminated core 8.

Next, ten permanent magnets 5 are installed at equal intervals in the circumferential direction on the polygonal sides on the outer surface of the laminated core 8.
Next, a cylindrical protective tube 6 formed by welding a rolled metal plate having a thickness of 0.1 mm is disposed around the permanent magnet 5 installed on the surface of the laminated core 8.
FIG. 5 is a diagram showing a state in which the gap formed by the laminated iron core, the permanent magnet, and the protective tube is filled with resin in the rotor of the rotating electrical machine of the present embodiment.
As shown in FIG. 5, the resin 7 is filled in the direction of the arrow from the end of the first iron core 1 of the rotor to complete the rotor 100 of the rotating electrical machine. The resin 7 may be filled not only from the end of the first iron core 1 but also from the end of the second iron core 2.
In addition, when PBT is used for the resin 7, it is filled by an injection molding method. When a two-component mixed epoxy resin of a main agent and a curing agent is used for the resin 7, a casting method in which the resin 7 is poured into the gap is used. Fill.

In the present embodiment, the thickness of the steel plate, the dimensions of the polygonal steel plate and the disk-shaped steel plate, the number of stacked first cores 1 and 2, the number of permanent magnets 5 installed, the thickness of the protective tube 6 Is not limited to the above numerical values, and is appropriately determined depending on the type and capacity of the rotating electrical machine.
The protective tube 6 made of a non-magnetic material is not limited to the cylindrical shape obtained by rolling and welding the above metal plate, but a cup shape or a cylindrical shape rolled by a deep drawing or a spatula drawing. It may be in a shape.
In order to firmly fix the magnet to the laminated iron core, the magnet may be weakly magnetized in advance and fixed to the laminated iron core by magnetic attraction.

Next, it will be described that the rotor 100 of the rotating electrical machine according to the present embodiment has excellent resistance to centrifugal force.
As a centrifugal force test of the rotor 100 of the rotating electrical machine having the above structure, the rotational speed of the rotor was gradually increased by external driving, and the rotational speed at which the protective tube 6 was plastically deformed was determined.
In the rotor of the test body (referred to as test body), a stainless steel cylindrical tube having a thickness of 0.1 mm is used for the protective tube 6, and the specific gravity ρ is 7500 (kg / m ^3). ) Neodymium sintered magnet was used. Moreover, the permanent magnet 5 used for the test body was prepared so that it might become m / Lc = S * (rho) = 0.16 (kg / mm). Here, m is the weight (kg) of the permanent magnet, S is the sectional area (mm ² ) of the permanent magnet, and Lc is the axial length (mm) of the rotor. That is, the weight m / Lc per rotor unit length of the permanent magnet in the test body is set to a constant value of 0.16 (kg / mm). The laminated iron core 8 was made of a silicon steel plate having the above shape, and the resin 7 was made of PBT.

Then, a test was performed on a plurality of specimens in which the weight m / Lc per rotor unit length of the permanent magnet was constant at 0.16 (kg / mm) and the rotor radius r (mm) was different. Further, a stainless steel cylindrical protective tube having a thickness of 0.1 mm is used, and a rotor not filled with resin is used as a comparative test body of Conventional Example 1, and a stainless steel cylindrical protective tube having a thickness of 0.2 mm is used. A rotor that was used and not filled with resin was used as a comparative specimen of Conventional Example 2. Also for these comparative test specimens, the weight m / Lc per rotor unit length of the permanent magnet is constant at 0.16 (kg / mm) and the test specimens have different rotor radii r (mm). A test was conducted.
FIG. 6 is a diagram showing the results of a centrifugal force test of the rotor of the rotating electrical machine.
As is apparent from FIG. 6, the rotor of the present embodiment is not limited to the conventional example 1 using a stainless steel cylindrical protective tube having the same thickness as the rotor of the present embodiment. The rotational speed at which the cylindrical protective tube 6 is plastically deformed is higher than that of the conventional example 2 using the stainless steel cylindrical protective tube that is thicker than the rotor of the embodiment, and the resistance to centrifugal force is excellent. .
Further, in the rotor of the present embodiment, when m / Lc is 0.16 (kg / mm) and r is 20 mm or less, the cylindrical protective tube used is made of stainless steel having a thickness of 0.1 mm. It can be seen that the tube can withstand use at a rotational speed of 30,000 revolutions per minute and the cylindrical protective tube does not undergo plastic deformation.

That is, in the rotor 100 of the rotating electrical machine of the present embodiment, the permanent magnet 5 and the resin 7 try to spread toward the outer periphery at the same time during high-speed rotation, so that the inner pressure is equally applied to the protective tube 6. Therefore, stress concentration on the protective tube 6 due to local contact of the permanent magnet 5 can be prevented, and tensile stress is applied to the protective tube 6 instead of bending stress. Since the metal generally has a tensile strength greater than the bending strength, the proof stress of the protective tube 6 is improved with respect to the same centrifugal force as compared with the case without the resin.
Moreover, in the rotor 100 of the rotating electrical machine of the present embodiment, the axial center portion between the first iron core 1 and the second iron core 2 made of a steel plate having a polygonal outer diameter shape, that is, the laminated iron core 8. In addition, a disk-shaped steel plate 3 having a diameter smaller than the diameter of the inscribed circle of the steel plate having a polygonal outer diameter is provided. Therefore, a ring-shaped resin can be disposed between the first iron core 1 and the second iron core 2, that is, outside the disk-shaped steel plate 3 in the groove portion, and the strength of the resin itself against centrifugal force is improved. Yes.
As described above, since the rotor 100 of the rotating electrical machine according to the present embodiment has a thin protective tube, the distance from the magnet to the stator, that is, the air gap can be reduced, torque reduction can be suppressed, and eddy current can be suppressed. The loss due to squeezing can also be suppressed and the characteristics of the rotating electrical machine are not deteriorated. In addition, since the rotor 100 of the rotating electrical machine according to the present embodiment is filled with the resin 7 in the gap formed by the laminated iron core 8, the permanent magnet 5, and the protective tube 6, the thickness of the protective tube is small. In addition, the permanent magnet 5 that can withstand the centrifugal force applied to the permanent magnet 5 during high-speed rotation can be fixed, and the reliability is high.

Although the laminated iron core 8 is used in the rotor of the rotating electrical machine of the present embodiment, an iron core made of an integral metal may be used.
FIG. 7 is a view showing an integrated iron core (a) and a shaft integrated iron core (b), which are iron cores of another form used in the rotor of the rotating electrical machine of the present embodiment.
The integrated iron core 81 shown in FIG. 7A has an outer shape of an integral iron member such as S45C made into a polygonal shape similar to that of the laminated iron core 8 by, for example, machining such as cutting and the axial direction of the iron core. The groove part 12 is provided in the substantially central iron core outer peripheral part, and the 1st iron core 13 and the 2nd iron core 14 are formed.
Further, in the shaft-integrated iron core 82 shown in FIG. 7 (b), after the iron member is manufactured in advance by cold forging, a portion that contacts the shaft 4 and the iron core is manufactured in advance, and the iron core portion is formed by cutting as in the integrated iron core 81. In addition to a rectangular outer shape, a groove 12 is provided, and a first iron core 13 and a second iron core 14 are formed.
Even if the iron core has such a form, the same effect as the rotor of the rotating electrical machine using the laminated core 8 can be obtained.

Embodiment 2. FIG.
FIG. 8 is a perspective view showing a state before the protection tube is mounted on the rotor of the rotating electrical machine according to the second embodiment of the present invention.
As shown in FIG. 8, the rotor of the rotating electrical machine according to the present embodiment also includes a first iron core 1 and a second iron core 2 formed by laminating steel plates having a polygonal shape, and a disk-shaped steel plate 3. A laminated core composed of the following: a shaft 4, a first permanent magnet 52 having a cross-sectional shape, a second permanent magnet 53 having a cross-sectional shape, and a protective tube (not shown) made of a non-magnetic material. And resin (not shown).
The first permanent magnets 52 are installed at equal intervals in the circumferential direction on the polygonal side portions that are the outer surface of the first iron core 1, and the polygonal side portions that are the outer surface of the second iron core 2 are arranged on the polygonal side portions. The second permanent magnets 53 are installed at equal intervals in the circumferential direction, and a plurality of installation patterns of the first permanent magnets 52 provided in the first iron core 1 and a plurality of provided in the second iron core 2 are provided. The installation pattern of the second permanent magnet 53 is the same.
The first iron core 1 and the second iron core 2 are arranged such that the plurality of second permanent magnets 53 are offset in the circumferential direction around the shaft of the iron core with respect to the plurality of first permanent magnets 52. To be installed.

Similar to the rotor of the rotating electrical machine of the first embodiment, the disk-shaped steel plate 3 has a diameter smaller than the diameter of the inscribed circle of the steel plate having a polygonal shape, and the first iron core 1 and the second iron plate It is sandwiched between the iron core 2. A laminated iron core formed of the first iron core 1, the second iron core 2, and the steel plate 3 has a shaft 4 press-fitted into a hole provided at the center thereof and fixed. A cutout may be provided in each of the shaft hole and the shaft 4 of the laminated iron core.
The shape of the steel plate forming the first iron core 1 and the second iron core 2 is not limited to a polygon as long as permanent magnets can be arranged on the outer surfaces of the first iron core 1 and the second iron core 2.
Moreover, although the shape of the steel plate 3 clamped between the 1st iron core 1 and the 2nd iron core 2 is made circular, it is not limited to this shape.
Also, the type of steel plate, the shape, dimensions, and material of a protective tube (not shown) made of a nonmagnetic material, and the resin (not shown) filled in the gap formed by the protective tube, the laminated iron core, and the permanent magnet ) Is the same as that used in the rotor of the rotating electrical machine of the first embodiment.

Next, the manufacturing method of the rotor of the rotary electric machine of this Embodiment is demonstrated.
Using a press, a steel plate having a thickness of 1 mm was punched into a polygonal shape having magnet positioning protrusions and an inscribed circle having a diameter of 35 mm, and 17 steel plates having this shape were laminated to form a first iron core 1. Form. Next, the punch is switched, and only one steel plate is punched out into a disk shape having an outer diameter of 30 mm. Next, the punch is switched again, the steel plate is punched into the same polygonal shape as the first iron core 1, and 17 steel plates of this shape are laminated to form the second iron core 2. When the second iron core 2 is formed, the second iron core 2 is installed at a slight angle with respect to the first iron core 1 by rotating a die and punching and laminating steel sheets. At this time, the punched polygonal steel plates may be connected by caulking.
Next, the shaft 4 is press-fitted into a shaft hole provided in the center of the laminated core.
Next, ten first permanent magnets 52 are installed at equal intervals in the circumferential direction on the sides of the polygon on the outer surface of the first iron core 1, and the polygons on the outer surface of the second iron core 2 are placed. Ten second permanent magnets 53 are installed at equal intervals in the circumferential direction on the side.
Next, in the same manner as in the first embodiment, the protective tube is disposed and the resin is filled. And resin may be arrange | positioned not only to the clearance gap formed with the laminated iron core, the permanent magnet, and the protective tube but to the surface of the edge part of the axial direction of a laminated iron core similarly to Embodiment 1. FIG.

In the present embodiment, the thickness of the steel plate, the dimensions of the polygonal steel plate and the disk-shaped steel plate, the number of stacked first cores 1 and 2 and the number of installed permanent magnets 52 are limited to the above values. It is not a thing but it is decided suitably by the kind and capacity | capacitance of a rotary electric machine.
In order to firmly fix the magnet to the laminated iron core, the magnet may be weakly magnetized in advance and fixed to the laminated iron core by magnetic attraction.
Also, the iron core may be an integral iron core or a shaft integral iron core, as in the first embodiment.

  The rotor of the rotating electrical machine according to the present embodiment has the same effects as the rotor of the rotating electrical machine according to the first embodiment, and a plurality of permanent magnets 52 provided on the outer periphery of the first iron core 1 and the second Since a plurality of permanent magnets 53 provided on the outer periphery of the iron core 2 are arranged at different angles in the circumferential direction around the shaft of the iron core, skew can be performed and rotation of the rotating electrical machine by cogging torque or the like There is also an effect that unevenness can be reduced.

Embodiment 3 FIG.
FIG. 9 is a perspective view (a) of the rotor of the rotating electrical machine according to the third embodiment of the present invention, and a BB cross-sectional view (b) perpendicular to the axial direction of the shaft in this perspective view. .
As shown in FIG. 9, the rotor 300 of the rotating electrical machine according to the present embodiment has a disk-shaped steel plate sandwiched between a first iron core 1 and a second iron core 2, and a protrusion 21 on the outer peripheral portion. The rotor is the same as the rotor of the rotating electrical machine of the first embodiment or the second embodiment except that the disk-shaped steel plate 31 provided with is used.
Segment magnets having a cross-sectional shape such as a cross section have manufacturing errors such as magnetic characteristics and shapes, and when used in a rotor, the magnetic force of each magnetic pole varies. These variations cause uneven rotation of the rotating electrical machine such as cogging torque.

When the distance between the rotor iron core and the stator iron core (air gap) is reduced, the rotating electrical machine increases the magnetic energy accumulated in the air gap even if the same permanent magnet is used. That is, as shown in FIG. 9, when the rotor core has a shape having a protrusion at a part thereof, the magnetic energy in the magnetic pole at the position where the protrusion is located can be increased (the magnetic force is increased).
Therefore, the rotor 300 of the rotating electrical machine according to the present embodiment measures the individual difference of the magnetic force of the single permanent magnet due to the manufacturing error of the permanent magnet in advance, and the disk facing the magnetic pole position to which the permanent magnet having a small magnetic force is fixed. The protrusions 21 are arranged on the plate-shaped steel plate portion. That is, a protrusion is provided on a line connecting the center of the shaft and the magnetic pole in the disk-shaped steel plate. If it does in this way, the variation in the magnetic force for every magnetic pole can be made small, and rotation irregularities, such as a cogging torque of a rotary electric machine, can be reduced.
That is, the disk-shaped steel plate 31 having the protrusions 21 of the present embodiment functions as a magnetic force adjusting steel plate. There may be a plurality of protrusions of the magnetic force adjusting steel plate, and the plurality of protrusions may have different shapes. Moreover, a silicon steel plate is mentioned also as the steel plate used for the steel plate for magnetic force adjustment, for example.

FIG. 10 shows another example of the magnetic force adjusting steel plate used in the rotor of the rotating electrical machine according to the present embodiment, a disk-shaped steel plate (a) provided with a plurality of trapezoidal protrusions, and a plurality of hills. It is a figure which shows the disk shaped steel plate (b) which provided the protrusion of this, and the triangular steel plate (c) which provided the trapezoidal protrusion in each corner | angular part.
As a magnetic adjustment steel plate, a disk-shaped steel plate 32 provided with a plurality of trapezoidal protrusions, a disk-shaped steel plate 33 provided with a plurality of hill-shaped protrusions, and a triangular shape provided with a trapezoidal protrusion at each corner Even if any of the steel plates 34 is used, the rotation unevenness such as cogging torque of the rotating electrical machine can be reduced.

  The rotor of the rotating electrical machine according to the present invention uses a thin protective cylindrical tube to fix the permanent magnet that can withstand the centrifugal force applied to the permanent magnet during high-speed rotation. Therefore, it can be used for a high-performance and high-reliability rotating electrical machine in which the centrifugal resistance of a permanent magnet is required.

It is an exploded view of the rotor of the rotary electric machine concerning Embodiment 1 of this invention. The perspective view (a) of the rotor of the rotary electric machine concerning Embodiment 1 of this invention, BB sectional drawing (b) perpendicular to the axial direction of the shaft of this perspective view, and CC sectional drawing ( c) and DD sectional drawing (d). It is a figure which shows the permanent magnet of another shape used for the rotor of the rotary electric machine concerning Embodiment 1 of this invention. A cylindrical protective tube (a), which is another shape of the protective tube used in the rotor of the rotating electrical machine according to the first embodiment of the present invention, in which a part of the axial end is bent, and the entire axial end It is a figure which shows the cylindrical protective tube (b) and the cup-shaped protective tube (c) which bent the periphery and provided the edge. In the rotor of the rotary electric machine concerning Embodiment 1 of this invention, it is a figure which shows the state which fills the clearance gap formed with the laminated iron core, the permanent magnet, and the protective tube with resin. It is a figure which shows the result of the centrifugal strength test of the rotor of the rotary electric machine concerning Embodiment 1 of this invention. It is a figure which shows the integrated iron core (a) and the shaft integrated iron core (b) which are the iron cores of another form used for the rotor of the rotary electric machine concerning Embodiment 1 of this invention. It is a perspective view which shows the state before mounting | wearing with the protective tube in the rotor of the rotary electric machine concerning Embodiment 2 of this invention. It is the perspective view (a) of the rotor of the rotary electric machine concerning Embodiment 3 of this invention, and BB sectional drawing (b) perpendicular | vertical with respect to the axial direction of the shaft of this perspective view. It is another Example of the steel plate for magnetic force adjustment used for the rotor of the rotary electric machine concerning Embodiment 3 of this invention, the disk shaped steel plate (a) which provided the some trapezoid protrusion, and the some hill It is a figure which shows the disc shaped steel plate (b) which provided the shape-like protrusion, and the triangular steel plate (c) which provided the trapezoid protrusion in each corner | angular part.

Explanation of symbols

1 1st iron core 2nd 2nd iron core 3 disc-shaped steel plate 4 shaft
5, 51 permanent magnet, 52 first permanent magnet, 53 second permanent magnet, 6 protective tube,
7 resin, 8 laminated iron core, 9 protrusion, 12 groove, 13 first iron core,
14 second iron core, 21 protrusions, 31 disk-shaped steel plate provided with protrusions,
32 A disk-shaped steel plate provided with a plurality of trapezoidal protrusions,
33 Disc-shaped steel plate provided with a plurality of hill-shaped protrusions,
34 Triangular steel plate with trapezoidal protrusions at each corner,
61 A cylindrical protective tube in which a part of the axial end is bent,
62 Cylindrical protective tube which is bent at the entire circumference of the axial end and provided with an edge,
63 cup-shaped protective tube, 81 integral iron core, 82 shaft integral iron core,
100, 300 A rotor of a rotating electric machine.

Claims (8)

An iron core having a first iron core and a second iron core, each having a groove portion provided in a substantially central outer peripheral portion in the axial direction, and a plurality of permanent magnets disposed on the outer surface of the iron core A shaft formed on the shaft portion of the iron core, a nonmagnetic material protective tube disposed on the outer periphery of the plurality of permanent magnets, and a gap formed by the iron core, the permanent magnet, and the protective tube A rotor of a rotating electrical machine, comprising: A steel sheet having a diameter smaller than that of the steel sheet used for the first iron core and the second iron core formed by laminating steel sheets, and the first iron core and the second iron core is the first iron core. 2. The rotor of a rotating electrical machine according to claim 1, wherein the rotor is a laminated core including a groove formed by being sandwiched between an iron core and the second iron core. The iron core includes a first iron core and a second iron core formed by machining in an integral iron core material, and a groove formed by machining between the first iron core and the second iron core. The rotor of a rotating electrical machine according to claim 1, wherein the rotor is an integral iron core. A plurality of first permanent magnets are installed at equal intervals on the outer surface of the first iron core, and a plurality of second permanent magnets are identical to the installation pattern of the first permanent magnet on the outer surface of the second iron core. The first iron core and the second iron core are installed in a pattern, and the plurality of second permanent magnets are inclined with respect to the plurality of first permanent magnets in the circumferential direction around the shaft of the iron core. The rotor of a rotating electrical machine according to any one of claims 1 to 3, wherein the rotor is installed so as to be shifted. 5. The rotor of a rotating electrical machine according to claim 1, wherein the resin is also disposed on the surface of the end portion in the axial direction of the iron core. 5. The rotating electrical machine according to claim 1, wherein a protrusion in contact with the permanent magnet is provided in an axial direction of an outer surface portion of the first iron core and the second iron core. Rotor. 5. The rotor of a rotating electrical machine according to claim 1, wherein at least a part of an axial end of the protective tube extends in the shaft direction. 3. The rotating electrical machine according to claim 2, wherein a protrusion is provided on a line connecting the center of the shaft of the steel plate sandwiched between the first iron core and the second iron core and the magnetic pole in the laminated iron core. Rotor.

Images