JP2005176530A - Rotation balance correction structure for permanent magnet type rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation balance correction structure for permanent magnet type rotating electric machine capable of preventing flux leakage from the side of each of permanent magnets using a balance wheel formed out of an inexpensive magnetic substance as a rotation balance correction component. <P>SOLUTION: This rotation balance correction structure includes a stator 42, and a rotor 43 which is inserted into the stator 42 with a gap kept and is provided with the plurality of permanent magnets 49 at a rotor core 48. In this rotation balance correction structure, a disc-shaped balance wheel 52 formed out of the magnetic substance such as iron material and steel material is fixed on an outer periphery of a shaft 47 with a clearance S relative to the permanent magnet 49 in the axial direction the shaft 47. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotation balance correcting structure for a permanent magnet type rotating electric machine (an electric motor or a generator).

  In a permanent magnet type electric motor in which a permanent magnet is incorporated in a rotor, a method of fixing the permanent magnet to the rotor core depends on a method by adhesion or a method by screw fastening. For this reason, there are many problems such as uneven coating of the adhesive and variations in tapping, which tends to cause the rotational balance to be distorted. For this reason, in the permanent magnet type electric motor, it is necessary to correct the rotation balance. When performing rotation balance correction, it is necessary to appropriately determine the material and structure of the rotation balance correction portion according to the position and arrangement of the permanent magnets.

  FIG. 12 is a first conventional example, and is a cross-sectional view of a permanent magnet type electric motor having a conventional rotation balance correcting structure. A permanent magnet motor 1 shown in FIG. 12 has a stator 2 and a rotor 3. The stator 2 includes a laminated steel core 4 and a stator coil 5 attached to the stator core 4, and is supported by a frame 6. The rotor 3 has a shaft 7 that is a rotating shaft, a rotor iron core 8 of a laminated steel plate fixed to the outer peripheral surface of the shaft 7, and a plurality of permanent magnets 9 attached to the outer peripheral surface of the rotor iron core 8 with an adhesive. It is made. The shaft 7 is rotatably supported by the frame 6 through bearings 10 and 11.

  In the permanent magnet type electric motor having a structure in which the permanent magnet 9 is attached to the rotor core 8 with an adhesive in this way, the balance of rotation is likely to be distorted due to a weight deviation due to uneven coating of the adhesive, etc. Correct the rotational balance. The balance gluer 12 has a disk shape and is fixed to the outer peripheral surface of the shaft 7 so as to be in contact with the side surface of the permanent magnet 9. In this case, since the balance gluma 12 and the permanent magnet 9 are in contact with each other, the balance gluma 12 needs to be made of a non-magnetic material in order to prevent magnetic flux leakage from the side surface of the permanent magnet 9.

  FIG. 13 shows a second conventional example. FIG. 13 (a) shows a cross-sectional view of a rotor of a permanent magnet type motor having a conventional rotational balance correcting structure, and FIG. 13 (b) shows FIG. 13 (a). ) Is a view in the direction of arrow A. The rotor 21 shown in FIG. 13 is formed by aluminum die casting. In this case, since aluminum is a nonmagnetic material, there is no magnetic flux leakage to the rotor side surface. Further, a rotation balance correcting pin 23 or the like can be formed in advance on the aluminum portion 22 of the rotor 21 by aluminum die casting, and a balance weight 24 is attached to the pin 23 and the pin 23 is caulked to adjust the rotation balance. It can be corrected. In FIG. 13, 28 is a shaft that is a rotating shaft of the rotor 21, 25 is a rotor core of a laminated steel plate fixed to the shaft 28, 26 is a permanent magnet provided so as to be embedded in the rotor core 26, and 27 is It is a blade formed on the aluminum part 22.

  FIG. 14 shows a third conventional example. FIG. 14 (a) shows a cross-sectional view of a rotor of a permanent magnet type motor having a conventional rotational balance correcting structure, and FIG. 14 (b) shows FIG. 14 (a). ) Shows a B direction arrow view. In the case of the rotor 31 that is not made of aluminum die casting as shown in FIG. 14, in addition to the rotor core 32 of the laminated steel plate that is fixed to the shaft 34 that is the rotating shaft of the rotor 31, a component for fixing the laminated steel plate (not shown) Bolts and nuts) and parts for correcting the rotation balance are required. In the illustrated example, a disk-shaped balance gluer 33 is used as a component for correcting the rotational balance, and the outer peripheral surface of the shaft 35 is in contact with the permanent magnet 36 embedded in the rotor core 32. It is fixed to. A balance weight 34 is attached to the balance gluer 35. Also in this case, since the balance gluma 33 and the permanent magnet 36 are in contact with each other, the balance gluma 33 needs to be made of a non-magnetic material in order to prevent magnetic flux leakage from the side surface of the permanent magnet 36.

  In addition, there exist the following patent documents 1 and 2 as a prior art document which discloses the conventional rotation balance correction structure.

Japanese Patent Publication No.8-32147 JP 2002-238223 A

  As described above, when the rotors 3 and 31 are configured without using aluminum die casting as in the first conventional example and the second conventional example, it is necessary to use the balance gluers 12 and 33 as parts for correcting the rotational balance. However, in this case, it is desirable that the material of the balance gluers 12 and 33 is a non-magnetic material such as stainless steel or aluminum in order to prevent magnetic flux leakage from the side surfaces of the permanent magnets 9 and 36. However, if non-magnetic material is used for the production of the balance gluers 12 and 33, the material cost becomes higher than the case where magnetic material such as steel or iron is used, leading to an increase in the cost of the permanent magnet motor. End up.

  Therefore, in view of the above problems, the present invention uses a permanent balance rotating machine made of an inexpensive magnetic material as a rotational balance correcting component, and can prevent magnetic flux leakage from the side of the permanent magnet. It is an object of the present invention to provide a rotational balance correction structure.

A rotation balance correction structure for a permanent magnet type rotating electrical machine according to a first aspect of the present invention that solves the above-described problem has a stator and a rotor that is inserted while holding a gap inside the stator, and the rotor includes a plurality of rotor cores. A rotation balance correcting structure for a permanent magnet type rotating electrical machine, which is provided with a permanent magnet,
A disc-shaped balance gluma made of a magnetic material is fixed to the outer peripheral surface of the rotary shaft in a state where a gap is provided between the permanent magnet and the permanent magnet in the axial direction of the rotary shaft of the rotor. To do.

Further, the rotation balance correcting structure of the permanent magnet type rotating electric machine of the second invention is the rotation balance correcting structure of the permanent magnet type rotating electric machine of the first invention.
A stepped portion is formed by making the outer diameter on the anti-permanent magnet side smaller than the outer diameter on the permanent magnet side at the balance gluma mounting position of the rotating shaft, and the axial position of the balance gluer is regulated by this stepped portion Thus, the gap is set.

Further, the rotation balance correcting structure of the permanent magnet type rotating electric machine of the third invention is the rotation balance correcting structure of the permanent magnet type rotating electric machine of the first or second invention.
The rotational balance correction is performed by attaching a balance weight to the axial side surface of the balance gluma.

Further, the rotation balance correcting structure of the permanent magnet type rotating electrical machine of the fourth invention is the rotational balance correcting structure of the permanent magnet type rotating electrical machine of the first or second invention.
The rotation balance is corrected by a weight reduction method for partially reducing the balance gluma.

Further, the rotation balance correcting structure of the permanent magnet type rotating electric machine of the fifth invention is the rotation balance correcting structure of the permanent magnet type rotating electric machine of the first or second invention.
A plurality of screw holes are formed in the axial side surface of the balance gluma along the circumferential direction of the balance gluma, and a rotation balance is corrected by screwing bolts as balance weights into the screw holes. It is characterized by that.

Further, the rotation balance correcting structure of the permanent magnet type rotating electrical machine of the sixth aspect of the invention is the rotational balance correcting structure of the permanent magnet type rotating electrical machine of the first or second aspect of the invention,
A ring-shaped convex portion protruding in the axial direction is formed on the axial side surface of the balance gluma, and the rotational balance is corrected by attaching a balance weight to the inner peripheral surface of the convex portion. It is characterized by.

Further, the rotation balance correcting structure of the permanent magnet type rotating electrical machine of the seventh invention is the rotational balance correcting structure of the permanent magnet type rotating electrical machine of any of the first to sixth inventions,
A cooling blade is provided on the axial side surface of the balance gluma.

Further, the rotation balance correcting structure of the permanent magnet type rotating electric machine according to the eighth invention is the rotation balance correcting structure of the permanent magnet type rotating electric machine according to any of the first to seventh inventions,
The outer diameter of the balance gluer is smaller than the inner diameter of the stator and larger than the outer diameter of the rotor.

Further, the rotation balance correcting structure of the permanent magnet type rotating electric machine of the ninth invention is the rotation balance correcting structure of the permanent magnet type rotating electric machine of the eighth invention,
The edge of the outer peripheral surface of the balance gulma is dropped.

  According to the rotational balance correcting structure of the permanent magnet type rotating electrical machine of the first aspect of the invention, the disc-shaped balance gluma made of a magnetic material is disposed on the rotary shaft in a state where a gap is provided between the permanent magnet and the permanent magnet in the axial direction. By fixing to the outer peripheral surface, even if the material of the balance gluma is a magnetic material, magnetic flux can be prevented from leaking from the side surface of the permanent magnet, and a magnetic material such as iron or steel can be used for the balance gluma. Therefore, since the material cost is lower than that of non-magnetic material such as stainless steel or aluminum, the cost of the permanent magnet type rotating electric machine can be reduced. In addition, when the balance gluma is a magnetic material such as steel, it is attracted by the attractive force of the permanent magnet. There is little nature.

  According to the rotation balance correcting structure of the permanent magnet type rotating electrical machine of the second invention, the step portion is formed at the balance glue mounting position of the rotary shaft, and the gap is set by regulating the axial position of the balance gluer at the step portion. Therefore, the balance S can be easily positioned and the gap S can be set.

  According to the rotational balance correction structure of the permanent magnet type rotating electrical machine of the third invention, since the balance type balance weight is used, the balance weight can be attached to any position on the side surface of the balance gluer. Is easy.

  According to the rotational balance correction structure of the permanent magnet type rotating electrical machine of the fourth aspect of the invention, since the rotational balance is corrected by the weight loss method for partially reducing the balance gluma, it is not necessary to prepare a balance weight, and arbitrarily Since the weight can be reduced, it is easy to adjust the weight balance.

  According to the rotation balance correcting structure of the permanent magnet type rotating electrical machine of the fifth aspect of the invention, a plurality of screw holes are formed along the circumferential direction of the balance gluma on the side surface in the axial direction of the balance gluma, and the balance weight is formed in the screw holes. Since the rotation balance is corrected by screwing the bolts, the balance weight (bolts) can be easily attached and removed, so that the weight balance can be easily adjusted.

  According to the rotational balance correcting structure for a permanent magnet type rotating electrical machine of the sixth aspect of the invention, a ring-shaped convex portion protruding in the axial direction is formed on the axial side surface of the balance gluma, and a balance weight is formed on the inner peripheral surface of the convex portion. Since the rotational balance is corrected by sticking, the balance weight does not have to be peeled off by the centrifugal force when the balance gluer rotates together with the rotor.

  According to the rotational balance correcting structure of the permanent magnet type rotating electrical machine of the seventh aspect of the invention, since the cooling blades are provided on the side surface in the axial direction of the balance gluer, when the balance gluer rotates together with the rotor, the cooling air generated by the blades causes the rotor to rotate. And the stator can be cooled.

  According to the rotational balance correcting structure of the permanent magnet type rotating electrical machine of the eighth aspect of the invention, the outer diameter of the balance gluma is smaller than the inner diameter of the stator and larger than the outer diameter of the rotor. The balance gulma serves as a guide and can prevent the permanent magnet or the rotor iron core from sticking directly to the inner surface of the stator, contributing to improved workability and quality assurance.

  According to the rotation balance correcting structure of the permanent magnet type rotating electrical machine of the ninth aspect of the invention, since the edge of the outer peripheral surface of the balance gluer is dropped, this portion (the chamfered portion) is smoothly guided to the inner surface of the stator. Contribute to improvement and quality assurance.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

<Embodiment 1>
FIG. 1A is a cross-sectional view of a permanent magnet type electric motor provided with a rotation balance correcting structure according to Embodiment 1 of the present invention, and FIG. 1B is a rotor as viewed in the direction of arrows CC in FIG. FIG. 1C is a cross-sectional view of the rotor taken along line DD in FIG. In FIG. 1 (a), only the upper half is shown and the lower half is omitted, but the permanent magnet type motor is vertically symmetrical. Moreover, Fig.2 (a) is the E section enlarged view of Fig.1 (a), FIG.2 (b) is F direction arrow sectional drawing of Fig.2 (a).

  As shown in FIG. 1, the permanent magnet motor 41 has a stator 42 and a rotor 43. The stator 42 includes a stator iron core 44 of a laminated steel plate (laminated iron core) and a stator coil 45 attached to the stator iron core 44, and is supported by a frame 46. The rotor 43 includes a shaft 47 that is a rotating shaft, a rotor core 48 that is integral with the shaft 47, and a plurality of permanent magnets 49 that are bonded to the outer peripheral surface of the rotor core 48 with an adhesive. The shaft 47 is rotatably supported by the frame 46 through bearings 50 and 51. A plurality of (three in the illustrated example) permanent magnets 49 are provided in the axial direction of the shaft 47 (hereinafter simply referred to as the axial direction) as shown in FIG. 1A, and the rotor core 48 is provided as shown in FIG. A plurality of magnetic poles (eight poles in the illustrated example) are formed by arranging the magnetic poles on the outer peripheral surface side of the permanent magnet 49 alternately with N, S, N, S. ing.

  Further, in this permanent magnet type electric motor 41, in order to correct the rotational balance error caused by the weight deviation caused by uneven coating of the adhesive when the permanent magnet 49 is pasted, the balance gulma 52 is used as a rotational balance correcting component. Yes. The balance gluma 52 is formed in a disk shape using a magnetic material such as steel or iron. Further, the balance gulma 52 has a hole 52d through which the shaft 47 is inserted at the center thereof, and has a ring shape.

  As shown in FIGS. 1 and 2, in the first embodiment, the adhesive is applied to the outer peripheral surface of the shaft 47 in a state where the balance gluma 52 is provided with a gap S between the permanent magnet 49 in the axial direction. It is fixed by fixing means such as shrink fitting. A stepped portion 47a is formed at the balance gulma mounting position of the shaft 47 by making the outer diameter on the anti-permanent magnet side smaller than the outer diameter on the permanent magnet side. By restricting the position, the gap S between the balance gluma 52 and the permanent magnet 49 can be set.

  In addition, in order to correct the rotational balance by adjusting the weight deviation, a balance weight 53 is attached to the side surface 52a of the balance weight 52 on the anti-permanent magnet side in the axial direction with an adhesive. Alternatively, a weight loss method may be used. That is, the rotational balance correction may be performed by partially cutting or punching the side surface 52a or the outer peripheral surface of the balance weight 52 to partially reduce the balance gluma 52.

  As described above, according to the first embodiment, the disc-shaped balance gluma 52 made of a magnetic material such as iron or steel is provided with the gap S between the permanent magnet 49 in the axial direction. Thus, by fixing to the outer peripheral surface of the shaft 47, even if the balance gluma 52 is made of a magnetic material, magnetic flux can be prevented from leaking from the side surfaces of the permanent magnet 49, and the balance gluma 52 can be made of iron or steel. Therefore, the cost of the permanent magnet motor can be reduced because the material cost is lower than that of non-magnetic material such as stainless steel or aluminum. In addition, when the balance gluma is a magnetic material such as steel, the balance magnet is attracted by the attractive force of the permanent magnet 49, but there is a gap S between the permanent magnet 49 and the balance gluma 52, so when assembling by hand, There is little risk of pinching.

  Further, a stepped portion 47a is formed at the balance gluma mounting position of the shaft 47, and since the stepped portion 47a regulates the axial position of the balance gluer 52 and sets the gap S, the balance gluer 52 is easily positioned and the gap is set. S can be set. The size of the gap S may be set as appropriate so as to prevent leakage of magnetic flux from the side surface of the permanent magnet 49 according to the strength and structure of the permanent magnet 49.

  In addition, when the pasting type balance weight 53 is used, the balance weight 53 can be pasted at an arbitrary position on the balance gluma side surface 52a, so that the weight balance can be easily adjusted. On the other hand, when the weight loss method is used, it is not necessary to prepare a balance weight, and the weight balance can be easily adjusted because the weight can be reduced arbitrarily.

<Embodiment 2>
FIG. 3A is a cross-sectional view of a principal part of a permanent magnet type electric motor provided with a rotation balance correcting structure according to Embodiment 2 of the present invention, and FIG. 3B is a cross-sectional view taken in the direction of the arrow G in FIG. It is. In the figure, the same parts as those in the first embodiment (FIGS. 1 and 2) are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, in the rotor 43 of the permanent magnet type electric motor according to the second embodiment, the balance gulma 52 is formed into a disk shape using a magnetic material such as steel or iron as in the case of the first embodiment. A hole 52d through which the shaft 47 is inserted is formed at the center thereof to form a ring shape, the position in the axial direction is regulated by the stepped portion 47a of the shaft 47, and between the permanent magnet 49 in the axial direction. In the state where the clearance S is provided, the outer peripheral surface of the shaft 47 is fixed by fixing means such as an adhesive or shrink fit.

  And in this Embodiment 2, the some screw hole 61 is formed in the side surface 52a by the side of the anti-permanent magnet of the axial direction of the balance gluer 52 by the tapping along the circumferential direction of the balance gluer 52, and this screw hole The balance weight (bolt) 62 is screwed to 61 to correct the rotation balance. Other configurations are the same as those in the first embodiment.

  Therefore, according to the second embodiment, the disk-shaped balance gluer 52 made of a magnetic material is fixed to the outer peripheral surface of the shaft 47 with a gap S between the permanent magnet 49 in the axial direction. As a result, the same effects as those of the first embodiment can be obtained. In the second embodiment, a screw hole 61 is formed on the side surface 52a of the balance gluer 52, and a balance weight (bolt) 62 is screwed into the screw hole 61 to correct the rotation balance. Therefore, since the balance weight (bolt) 62 can be easily attached and detached, the weight balance can be easily adjusted.

<Embodiment 3>
4 (a) is a cross-sectional view of the main part of a permanent magnet type electric motor provided with a rotation balance correcting structure according to Embodiment 3 of the present invention, and FIG. 4 (b) is a cross-sectional view taken in the direction of arrow H in FIG. 4 (a). It is. In the figure, the same parts as those in the first embodiment (FIGS. 1 and 2) are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, even in the rotor 43 of the permanent magnet type electric motor of the third embodiment, the balance gulma 52 is formed in a disk shape using a magnetic material such as steel or iron as in the case of the first embodiment. A hole 52d through which the shaft 47 is inserted is formed at the center thereof to form a ring shape, the position in the axial direction is regulated by the stepped portion 47a of the shaft 47, and between the permanent magnet 49 in the axial direction. In the state where the clearance S is provided, the outer peripheral surface of the shaft 47 is fixed by fixing means such as an adhesive or shrink fit.

  And in this Embodiment 3, the ring-shaped convex part 52b protruded in the axial direction toward the anti-permanent magnet side is formed in the outer peripheral part of the axial side surface 52a of the balance gluma 52, and this convex part 52b The rotation balance is corrected by adhering a balance weight 63 to the inner peripheral surface 52c with an adhesive. Other configurations are the same as those in the first embodiment.

  Therefore, according to the third embodiment, the disc-shaped balance gluer 52 made of a magnetic material is fixed to the outer peripheral surface of the shaft 47 with a gap S between the permanent magnet 49 in the axial direction. As a result, the same effects as those of the first embodiment can be obtained. In the third embodiment, since the balance weight 63 is attached to the inner peripheral surface 53c of the convex portion 52b of the balance gluer 52, when the balance gluer 52 rotates together with the rotor 43, the balance force is applied by centrifugal force. There is no possibility that the weight 63 will come off.

<Embodiment 4>
FIG. 5A is a cross-sectional view of the main part of a permanent magnet type electric motor provided with a rotation balance correcting structure according to Embodiment 4 of the present invention, and FIG. 5B is a cross-sectional view taken in the direction of the arrow I in FIG. It is. In the figure, the same parts as those in the first embodiment (FIGS. 1 and 2) are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, in the rotor 43 of the permanent magnet type electric motor according to the fourth embodiment, the balance gulma 52 is formed in a disk shape using a magnetic material such as steel or iron as in the case of the first embodiment. A hole 52d through which the shaft 47 is inserted is formed at the center thereof to form a ring shape, the position in the axial direction is regulated by the stepped portion 47a of the shaft 47, and between the permanent magnet 49 in the axial direction. In the state where the clearance S is provided, the outer peripheral surface of the shaft 47 is fixed by fixing means such as an adhesive or shrink fit.

  The balance gulma 52 of the fourth embodiment is provided with a plurality of cooling blades 64 on the side surface 52a on the anti-permanent magnet side in the axial direction of the balance gulma 52. Other configurations are the same as those in the first embodiment.

  Therefore, according to the fourth embodiment, the disk-shaped balance gluer 52 made of a magnetic material is fixed to the outer peripheral surface of the shaft 47 with a gap S between the permanent magnet 49 in the axial direction. As a result, the same effects as those of the first and second embodiments can be obtained. In the fourth embodiment, since the cooling blade 64 is provided in the balance gluer 52, when the balance gluer 52 rotates together with the rotor 43, the rotor and the stator are cooled by the cooling air generated by the blades 64. You can also.

<Embodiment 5>
6 (a) is a cross-sectional view of a principal part of a permanent magnet type electric motor provided with a rotation balance correcting structure according to Embodiment 5 of the present invention, and FIG. 6 (b) is a cross-sectional view taken along the arrow J in FIG. 6 (a). It is. In the figure, the same parts as those in the first and second embodiments (FIGS. 1, 2, and 3) are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, even in the rotor 43 of the permanent magnet type electric motor of the fifth embodiment, the balance gulma 52 is formed in a disk shape using a magnetic material such as steel or iron as in the case of the first embodiment. A hole 52d through which the shaft 47 is inserted is formed at the center thereof to form a ring shape, the position in the axial direction is regulated by the stepped portion 47a of the shaft 47, and between the permanent magnet 49 in the axial direction. In the state where the clearance S is provided, the outer peripheral surface of the shaft 47 is fixed by fixing means such as an adhesive or shrink fit.

  Also in the balance gulma 52 of the fifth embodiment, a plurality of cooling blades 64 are provided on the side surface 52 a on the anti-permanent magnet side in the axial direction of the balance gulma 52. Other configurations are the same as those of the first and second embodiments.

  Therefore, according to the fifth embodiment, the disc-shaped balance gluer 52 made of a magnetic material is fixed to the outer peripheral surface of the shaft 47 with a gap S between the permanent magnet 49 in the axial direction. As a result, the same effects as those of the first and second embodiments can be obtained. Also in the fifth embodiment, since the cooling blades 64 are provided in the balance gulma 52, the rotor, the stator, and the like are cooled by the cooling air generated by the blades 64 when the balance gulma 52 rotates together with the rotor 43. You can also.

<Embodiment 6>
FIG. 7 (a) is a cross-sectional view of the main part of a permanent magnet type electric motor provided with a rotation balance correcting structure according to Embodiment 6 of the present invention, and FIG. 7 (b) is a cross-sectional view taken in the direction of the arrow K in FIG. It is. In the figure, the same parts as those in the first and third embodiments (FIGS. 1, 2, and 4) are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, even in the rotor 43 of the permanent magnet type electric motor of the sixth embodiment, the balance gulma 52 is formed in a disk shape using a magnetic material such as a steel material or an iron material as in the case of the first embodiment. A hole 52d through which the shaft 47 is inserted is formed at the center thereof to form a ring shape, the position in the axial direction is regulated by the stepped portion 47a of the shaft 47, and between the permanent magnet 49 in the axial direction. In the state where the clearance S is provided, the outer peripheral surface of the shaft 47 is fixed by fixing means such as an adhesive or shrink fit.

  Also in the balance gulma 52 of the sixth embodiment, a plurality of cooling blades 64 are provided on the side surface 52 a on the anti-permanent magnet side in the axial direction of the balance gulma 52. Other configurations are the same as those of the first and third embodiments.

  Therefore, according to the sixth embodiment, the disc-shaped balance glumer 52 made of a magnetic material such as iron or steel is placed on the shaft 47 with the gap S between the permanent magnet 49 in the axial direction. The effect similar to the said Embodiment 1, 3 can be acquired by fixing to an outer peripheral surface. Also in the sixth embodiment, since the cooling blades 64 are provided in the balance gluma 52, when the balance gluer 52 rotates together with the rotor 43, the rotor and the stator are cooled by the cooling air generated by the blades 64. You can also.

<Embodiment 7>
FIG. 8 is a cross-sectional view of a principal part of a permanent magnet type electric motor provided with a rotation balance correcting structure according to Embodiment 7 of the present invention. In the figure, the same parts as those in the first embodiment (FIGS. 1 and 2) are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 8, even in the rotor 43 of the permanent magnet type electric motor of the seventh embodiment, the balance gulma 52 is formed in a disk shape using a magnetic material such as steel or iron as in the case of the first embodiment. A hole 52d through which the shaft 47 is inserted is formed at the center thereof to form a ring shape, the position in the axial direction is regulated by the stepped portion 47a of the shaft 47, and between the permanent magnet 49 in the axial direction. In the state where the clearance S is provided, the outer peripheral surface of the shaft 47 is fixed by fixing means such as an adhesive or shrink fit.

  In the seventh embodiment, the outer diameter D1 of the balance gluer 52 is smaller than the inner diameter D2 of the stator 42 and larger than the outer diameter D3 of the rotor 43 (rotor outer diameter D3 <outside balance gluer). Diameter D1 <stator inner diameter D2).

  Therefore, according to the seventh embodiment, the disc-shaped balance gluer 52 made of a magnetic material is fixed to the outer peripheral surface of the shaft 47 with a gap S between the permanent magnet 49 in the axial direction. As a result, the same effects as those of the first embodiment can be obtained. In the seventh embodiment, the outer diameter D1 of the balance gluer 52 is made smaller than the inner diameter D2 of the stator 42 and larger than the outer diameter D3 of the rotor 43, so that the rotor 43 is inserted into the stator 42. At this time, the balance gluer 52 serves as a guide, and the permanent magnet 49 or the rotor core 48 can be prevented from sticking directly to the inner surface of the stator 42, which contributes to improvement in workability and quality assurance.

  Although not shown in the drawings, in the rotational balance correcting structures of the second to sixth embodiments, of course, the dimensional relationship among the balance gluer outer diameter, the stator inner diameter, and the rotor outer diameter can be set as described above. it can.

<Eighth embodiment>
FIG. 9 is a cross-sectional view of a main part of a permanent magnet type electric motor provided with a rotation balance correcting structure according to Embodiment 8 of the present invention. In the figure, the same parts as those in the first and seventh embodiments (FIGS. 1, 2 and 9) are denoted by the same reference numerals, and the detailed description thereof is omitted.

  As shown in FIG. 9, even in the rotor 43 of the permanent magnet type electric motor according to the eighth embodiment, the balance gulma 52 is formed in a disk shape using a magnetic material such as a steel material or an iron material as in the first embodiment. A hole 52a for inserting the shaft 47 is formed in the center portion thereof to form a ring shape, the position in the axial direction is regulated by the stepped portion 47a of the shaft 47, and between the permanent magnet 49 in the axial direction. In the state where the clearance S is provided, the outer peripheral surface of the shaft 47 is fixed by fixing means such as an adhesive or shrink fit.

  In the eighth embodiment, the outer diameter D1 of the balance gluer 52 is smaller than the inner diameter D2 of the stator 42 and larger than the outer diameter D3 of the rotor 43 (rotor outer diameter D3 <outside balance gluer). The diameter D1 <the stator inner diameter D2), and the edge (axial corner portion) of the outer peripheral surface of the balance gluer 52 is dropped and chamfered (chamfered portion 52e). In addition, although illustration is abbreviate | omitted, you may attach R to the chamfering part 52e by chamfering in circular arc shape.

  Therefore, according to the eighth embodiment, the disc-shaped balance glumer 52 made of a magnetic material such as iron or steel is placed on the shaft 47 with the gap S between the permanent magnet 49 in the axial direction. The effect similar to the said Embodiment 1 can be acquired by fixing to an outer peripheral surface. In the eighth embodiment, the outer diameter D1 of the balance gluer 52 is made smaller than the inner diameter D2 of the stator 42 and larger than the outer diameter D3 of the rotor 43, so that the rotor 43 is inserted into the stator 42. At this time, the permanent magnet 49 or the rotor iron core 48 can be prevented from sticking directly to the inner surface of the stator 42, and the edge of the balance gluer 52 is dropped, so that this portion (the chamfered portion 52 e) becomes the stator 42. Because it is guided smoothly on the inner surface of the hood, it contributes to improving workability and ensuring quality.

  In the rotational balance correcting structures of the second to sixth embodiments, the balance relationship between the outer diameter of the balance gluer, the inner diameter of the stator, and the outer diameter of the rotor is as described above, and the edge of the balance gluer 52 as described above. Can be chamfered. In this case, when the convex portion 52b is formed on the outer peripheral portion of the balance gluma 52 as shown in FIG. 4, the edge of the convex portion 52b may be dropped and chamfered. When formed, the edge of the blade 64 may be dropped and chamfered as illustrated in FIGS. 10 and 11 (the chamfered portion 64a).

  Moreover, this invention is applicable not only to a permanent magnet type motor but to a permanent magnet type generator. Furthermore, the present invention is not limited to the case where the permanent magnet is attached to the outer peripheral surface of the rotor iron core as described above, but can be applied to the case where the permanent magnet is embedded in the rotor iron core as shown in FIG. 14, for example.

  The present invention relates to a rotation balance correction structure of a permanent magnet type rotating electric machine (an electric motor or a generator), and is useful when applied to a balance balancer of a magnetic material as a rotation balance correction component.

(A) is sectional drawing of the permanent magnet type electric motor provided with the rotation balance correction structure which concerns on Embodiment 1 of this invention, (b) is rotor sectional drawing of CC arrow of (a), (c). [FIG. 4] It is rotor sectional drawing of the DD line | wire arrow of (a). (A) is the E section enlarged view of Drawing 1 (a), and (b) is a F direction arrow sectional view of (a). (A) is principal part sectional drawing of the permanent magnet type electric motor provided with the rotation balance correction structure which concerns on Embodiment 2 of this invention, (b) is G direction arrow sectional drawing of (a). (A) is principal part sectional drawing of the permanent-magnet-type electric motor provided with the rotation balance correction structure which concerns on Embodiment 3 of this invention, (b) is H direction arrow sectional drawing of (a). (A) is principal part sectional drawing of the permanent-magnet-type electric motor provided with the rotation balance correction structure which concerns on Embodiment 4 of this invention, (b) is I direction arrow sectional drawing of (a). (A) is principal part sectional drawing of the permanent magnet type electric motor provided with the rotation balance correction structure which concerns on Embodiment 5 of this invention, (b) is a J direction arrow directional cross-sectional view of (a). (A) is principal part sectional drawing of the permanent-magnet-type electric motor provided with the rotation balance correction structure which concerns on Embodiment 6 of this invention, (b) is a K direction arrow directional cross-sectional view of (a). It is principal part sectional drawing of the permanent magnet type motor provided with the rotation balance correction structure which concerns on Embodiment 7 of this invention. It is principal part sectional drawing of the permanent magnet type electric motor provided with the rotation balance correction structure which concerns on Embodiment 8 of this invention. It is sectional drawing which shows the structure which dropped the edge of the balance gluma which has a blade | wing. It is sectional drawing which shows the structure which dropped the edge of the balance gluma which has a blade | wing. It is sectional drawing of the permanent magnet type electric motor provided with the conventional rotation balance correction structure. (A) is sectional drawing of the rotor of the permanent magnet type motor provided with the conventional rotation balance correction structure, (b) is an A direction arrow directional view of (a). (A) is sectional drawing of the rotor of the permanent magnet type electric motor provided with the conventional rotation balance correction structure, (b) is a B direction arrow directional view of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 41 Permanent magnet type motor 42 Stator 43 Rotor 44 Stator iron core 45 Stator coil 46 Frame 47 Shaft 47a Step part 48 Rotor iron core 49 Permanent magnet 50, 51 Bearing 52 Balance gulma 52a Side surface 52b Convex part 52c Inner peripheral surface 52d Hole 52e Chamfer part 53 Balance weight 61 Screw hole 62 Balance weight (bolt)
63 Balance weight 64 Blade 64a Chamfer

Claims (9)

The rotor has a rotation balance correcting structure for a permanent magnet type rotating electrical machine having a stator and a rotor inserted with a gap inside the stator, wherein the rotor is provided with a plurality of permanent magnets on the rotor core. And
A disc-shaped balance gluma made of a magnetic material is fixed to the outer peripheral surface of the rotary shaft in a state where a gap is provided between the permanent magnet and the permanent magnet in the axial direction of the rotary shaft of the rotor. Rotation balance correction structure for permanent magnet type rotating electrical machines. In the rotation balance correcting structure of the permanent magnet type rotating electric machine according to claim 1,
A stepped portion is formed by making the outer diameter on the anti-permanent magnet side smaller than the outer diameter on the permanent magnet side at the balance gluma mounting position of the rotating shaft, and the axial position of the balance gluer is regulated by this stepped portion A rotation balance correcting structure for a permanent magnet type rotating electric machine, wherein the gap is set as described above. In the rotation balance correction structure of the permanent magnet type rotating electric machine according to claim 1 or 2,
A rotation balance correction structure for a permanent magnet type rotating electrical machine, wherein rotation balance correction is performed by attaching a balance weight to the axial side surface of the balance gluma. In the rotation balance correction structure of the permanent magnet type rotating electric machine according to claim 1 or 2,
A rotation balance correction structure for a permanent magnet type rotating electrical machine, wherein the rotation balance is corrected by a weight reduction method for partially reducing the balance gluma. In the rotation balance correction structure of the permanent magnet type rotating electric machine according to claim 1 or 2,
A plurality of screw holes are formed in the axial side surface of the balance gluma along the circumferential direction of the balance gluma, and a rotation balance is corrected by screwing bolts as balance weights into the screw holes. A structure for correcting the rotational balance of a permanent magnet type rotating electrical machine. In the rotation balance correction structure of the permanent magnet type rotating electric machine according to claim 1 or 2,
A ring-shaped convex portion protruding in the axial direction is formed on the axial side surface of the balance gluma, and the rotational balance is corrected by attaching a balance weight to the inner peripheral surface of the convex portion. Permanent magnet type rotating electrical machine. In the rotation balance correction structure of the permanent magnet type rotating electric machine according to any one of claims 1 to 6,
A rotation balance correcting structure for a permanent magnet type rotating electric machine, wherein cooling vanes are provided on the axial side surface of the balance gluma. In the rotation balance correction structure of the permanent magnet type rotating electrical machine according to any one of claims 1 to 7,
A rotation balance correcting structure for a permanent magnet type rotating electrical machine, wherein the outer diameter of the balance gluma is smaller than the inner diameter of the stator and larger than the outer diameter of the rotor. In the rotation balance correction structure of the permanent magnet type rotating electric machine according to claim 8,
A rotation balance correcting structure of a permanent magnet type rotating electric machine, wherein an edge of an outer peripheral surface of the balance gluma is dropped.

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