JP4556556B2 - Rotating electrical machine rotor - Google Patents

Description

  The present invention relates to a rotor of a rotating electrical machine.

  As a motor, a generator, etc. (rotary electric machine), there is a permanent magnet type synchronous rotating machine in which a rotor (rotor) includes a permanent magnet.

  Japanese Unexamined Patent Publication No. 2000-37053 (Patent Document 1) includes a stator having a stator winding, and a rotor configured by incorporating a permanent magnet for forming a magnetic pole into a through hole provided in a rotor core. A rotating electrical machine including a rotating shaft press-fitted into a rotor core is disclosed.

In one of the embodiments of this document, an adhesive is applied to the rotor core side of a non-magnetic end plate that is press-fitted into the rotating shaft to prevent the end plate and the permanent magnet from coming off during high-speed rotation. The fact that it is surely done is described.
JP 2000-37053 A Japanese Patent Laid-Open No. 10-285850 JP 2000-201444 A JP 2003-2559577 A

  However, if the end plate of the non-magnetic material and the rotor core are directly bonded, due to the difference in the coefficient of linear expansion between the two materials, a burden is placed on the iron core when the heat cycle of heat generation and cooling is repeated for the rotating electrical machine. It takes.

  FIG. 10 is a view for explaining the shape of the electromagnetic steel plate 52 used as the rotor core.

  Referring to FIG. 10, electromagnetic steel plate 52 is an annular steel plate having a hole in the central portion, and projections 111 and 112 for positioning by fitting with a shaft are provided in the hole portion in the central portion. Is provided. In the peripheral portion, holes 101 and 102 for inserting permanent magnets are provided.

  By laminating such electromagnetic steel sheets 52, the iron core of the rotor is formed.

  FIG. 11 is a diagram for explaining a cross-sectional portion of the rotor corresponding to the XI-XI portion in FIG. 10.

  Referring to FIG. 11, a plurality of electromagnetic steel plates 52 are stacked on top of end plate 41. The holes 101 and 102 of the electromagnetic steel plate 52 in FIG. 10 form through holes in the iron core (core) for inserting the permanent magnet 56. Adhesive 54 is injected into this through hole, and permanent magnet 56 is inserted, and finally end plate 40 is assembled onto the core. Then, the adhesive 54 may enter the gap between the end plates 40 and 41 and the iron core of the rotor, and the end plates 40 and 41 and the electromagnetic steel plate at the end of the rotor iron core may be bonded.

  FIG. 12 is a diagram for explaining the stress acting between the end plate and the electromagnetic steel sheet.

  Referring to FIG. 12, assume that end plate 40 and electromagnetic steel plate 52 are partially bonded by adhesive 54. For example, in FIG. 10, a case where the peripheral portions of the hole 101 and the hole 102 are partially bonded to the end plate 40 by an adhesive is conceivable.

  The end plate 40 is usually made of an aluminum alloy, and the amount of thermal expansion and contraction D40 of the aluminum alloy is larger than the amount of thermal expansion and contraction D52 of the electrical steel sheet 52 as shown in FIG.

  If the linear expansion coefficients of the end plate 40 and the electromagnetic steel plate 52 are greatly different, excessive stress is applied to the electromagnetic steel plate 52 which is thin and disadvantageous in shape due to repeated heating and cooling. In particular, the region 103 in FIG. 10 is narrowed by providing the holes 101 and 102. When the electromagnetic steel plate 52 in the vicinity of the holes 101 and 102 is bonded to the end plate 40 with an adhesive, stress due to the difference in linear expansion coefficient is concentrated in this region 103. There is a problem that the electrical steel sheet may be fatigued by repeated application of such stress.

  An object of the present invention is to provide a rotor of a rotating electrical machine with improved reliability.

  In summary, the present invention is a rotor of a rotating electrical machine, and includes a rotating shaft, an iron core portion arranged around the rotating shaft and provided with a plurality of through holes, and a plurality of pieces respectively accommodated in the plurality of through holes. A permanent magnet, a filler filled in a gap between the permanent magnet and the iron core in each of the plurality of through holes, and a pair of end plates that sandwich the iron core from both sides so as to close the opening of the through hole; It is provided in the boundary part of an end plate and an iron core part, and is provided with the adhesion suppression part which suppresses adhesion with the end plate and iron core part by a filler.

  Preferably, the adhesion suppressing portion is a nonmagnetic member interposed in a gap between the pair of end plates and the iron core portion, and the difference between the linear expansion coefficient of the nonmagnetic member and the linear expansion coefficient of the iron core portion It is smaller than the difference between the linear expansion coefficient and the linear expansion coefficient of the iron core.

  More preferably, the nonmagnetic member is a plate-shaped member formed so as to close at least the through hole.

  More preferably, the nonmagnetic member is made of stainless steel.

  Preferably, the adhesion suppressing portion is a nonmagnetic member interposed in a gap between the pair of end plates and the iron core portion, and the nonmagnetic member has elasticity more than the end plate.

  Preferably, the adhesion suppressing portion is a release agent layer applied to the end plate.

  Preferably, the end plate includes a non-magnetic main member and a non-magnetic sub member fitted in the main member and covering the hole, and the difference between the linear expansion coefficient of the sub member and the linear expansion coefficient of the iron core is The difference between the linear expansion coefficient of the main member and the linear expansion coefficient of the iron core is smaller.

  More preferably, the sub member is made of stainless steel.

  Preferably, the end plate includes a non-magnetic main member and a non-magnetic sub member fitted in the main member and covering the through hole, and the sub member has elasticity more than the main member.

  According to another aspect of the present invention, the rotor of the rotating electrical machine is housed in a rotating shaft, an iron core portion arranged around the rotating shaft and provided with a plurality of through holes, and a plurality of through holes, respectively. A plurality of permanent magnets, a pair of end plates sandwiching the iron core from both sides so as to close the opening of the through hole, and a filler filled in the gap between the permanent magnet and the iron core in each of the plurality of through holes With. The filler is a putty material that cures but has weak adhesion to surrounding members.

  Preferably, the iron core portion includes a plurality of ferromagnetic plates laminated in parallel to a plane orthogonal to the rotation axis, and each of the plates is formed with a hole for forming a through hole. Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, adhesion | attachment of the end plate and an electromagnetic steel plate by an adhesive agent is suppressed, and it is prevented that an electromagnetic steel plate is fatigued by the difference of the linear expansion coefficient of an end plate and an electromagnetic steel plate.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is a cross-sectional view of a rotor (rotor) of the rotating electrical machine according to the present embodiment.

  Referring to FIG. 1, the rotor 10 includes a shaft 20, a rotor core 50 held around the shaft 20, end plates 40 and 41 sandwiching the rotor core 50, a resolver 30 that detects rotation of the rotor 10, and a resolver. And a snap ring 32 that is fixed so as not to come off.

  Around the shaft 20, a flange 22 is formed for holding a rotor core 50 in which electromagnetic steel plates are laminated.

  FIG. 2 is a diagram for explaining the A part of FIG. 1 in detail.

  FIG. 3 is a flowchart for explaining the rotor assembly process.

  2 and 3, first, in step S1, the end plate 41 is attached to the shaft 20 of FIG. Subsequently, in step S2, the stainless plate 58 is attached to the upper portion of the end plate. Further, in step S3, a rotor core in which the electromagnetic steel plates 52 are stacked on the stainless steel plate 58 is attached.

  As a result of laminating the electromagnetic steel plates 52, through holes for inserting permanent magnets are formed by the holes 101 and 102 shown in FIG. 10, and the lower part thereof is closed with the stainless steel plate 58.

  Subsequently, an appropriate amount of adhesive 54 is injected into the through hole for inserting the permanent magnet 56 in step S4. Subsequently, in step S5, the permanent magnet 56 is inserted into the hole. Thereby, the liquid level of the adhesive 54 rises and reaches the entire through hole for inserting the magnet of the rotor core 50.

  Subsequently, in step S6, the stainless steel plate 51 is attached to the electromagnetic steel plate 52. The stainless plate 51 closes the upper part of the through hole for inserting the magnet.

  Finally, the end plate 40 is attached to the shaft 20 to complete the assembly.

  The end plates 40 and 41 and the stainless plates 51 and 58 are made of a non-magnetic material so that the magnetic flux of the permanent magnet does not leak due to leakage in a direction parallel to the rotation axis of the shaft. The end plates 40 and 41 are preferably made of a lightweight aluminum alloy.

  FIG. 4 is a view for explaining the shape of the stainless steel plate 51.

  Referring to FIG. 4, stainless steel plate 51 has a donut shape in which holes 101 and 102 are not provided in the shape of electromagnetic steel plate 52 described in FIG. 10. Protrusions 61 and 62 for positioning by fitting with the shaft are provided in the central hole portion. By overlapping the electromagnetic steel plate 52 with the stainless steel plate 51, the through hole for inserting a magnet is closed by the stainless steel plate 51.

  2 has the same shape as stainless plate 51, and therefore description thereof will not be repeated.

  FIG. 5 is a diagram for explaining the stress acting on the electromagnetic steel sheet in the first embodiment.

  Referring to FIG. 5, stainless plate 51 is interposed between end plate 40 and electromagnetic steel plate 52. The stainless steel plate 51 has a shape that closes a hole for inserting a permanent magnet provided in the electromagnetic steel plate 52.

  Therefore, the magnetic steel sheet 52 and the end plate 40 are prevented from being bonded by the adhesive 54 for fixing the permanent magnet.

For example, the end plate 40 is made of an aluminum alloy, and its linear expansion coefficient is approximately 24 × 10 ⁻⁶ . The electromagnetic steel sheet 52 has a linear expansion coefficient of approximately 13 × 10 ⁻⁶ . On the other hand, the linear expansion coefficient of stainless steel is approximately 18 × 10 ^−6, which is closer to the linear expansion coefficient of the steel plate than that of the aluminum alloy.

  Therefore, the repetitive stress acting on the P portion is more relaxed than in the case shown in FIG. That is, the thermal expansion and contraction amount D51 due to the cold heat of the stainless steel plate is closer to the thermal expansion and contraction amount D52 of the electromagnetic steel plate 52 than the thermal expansion and contraction amount D40 of the end plate, and therefore, compared with the case shown in FIG. The stress acting on is reduced.

  Therefore, the electrical steel sheet is prevented from being fatigued and destroyed due to the difference in the linear expansion coefficient between the end plate and the electrical steel sheet.

  The end plate must be made of a non-magnetic material to prevent loss of the magnetic circuit. Further, since the laminated electromagnetic steel sheets are pressed from both sides, a certain degree of rigidity is required. Also, the end plate should be lighter to reduce the overall weight of the rotor. For this reason, for example, an aluminum alloy is used.

  As shown in FIG. 2, by interposing the thin stainless steel plates 51 and 58 between the end plates 40 and 41 and the electromagnetic steel plate 52, the cost can be kept lower than using an expensive stainless steel material as the end plate, In addition, the weight can be reduced.

  In the first embodiment, the stainless steel is exemplified as the material of the plate sandwiched between the electromagnetic steel plate and the end plate. However, the present invention is not limited to this, and the linear expansion coefficient is close to that of the magnetic steel plate that is a non-magnetic material and constitutes the rotor core. If it is made of a material, the plate may be made of another material.

  Regardless of the linear expansion coefficient, if the plate is made of a non-magnetic material made of an elastic material instead of the thin stainless steel plates 51 and 58, the stress on the electromagnetic steel sheet can be relieved.

[Embodiment 2]
FIG. 6 is a diagram for explaining the rotor according to the second embodiment.

  Referring to FIG. 6, the rotor of the second embodiment is configured by main member 80 and sub member 90 instead of end plates 40 and 41 and stainless steel plates 51 and 58 in the rotor of the first embodiment described in FIG. And an end plate constituted by a main member 81 and a sub member 91.

  A non-magnetic sub member 90 is fitted into the main member 80. The main member 81 is fitted with a non-magnetic sub member 91. The main members 80 and 81 are preferably made of an aluminum alloy that is light and non-magnetic like the end plates 40 and 41 of the first embodiment. The sub members 90 and 91 are made of a nonmagnetic material having a linear expansion coefficient close to that of the electromagnetic steel plate 52. For example, stainless steel can be used for the sub members 90 and 91.

  FIG. 7 is an enlarged view of a part of the end plate in FIG.

  In FIG. 7, a sub member 90 is fitted in a portion of the main member 80 of the end plate that is in the vicinity of the opening of the holes 101 and 102 of the electromagnetic steel plate indicated by the broken line. The shape of the sub member 90 is such that it does not jump out of the main member 80 in the outer circumferential direction due to the centrifugal force generated by the rotation of the rotor.

  When the rotor is assembled, the sub-member 90 closes the openings of the magnetic steel plate holes 101 and 102. Therefore, the sub member 90 functions as an adhesion suppressing portion that suppresses the adhesive force of the adhesive to the main member 80. Similarly, the sub member 91 in FIG. 6 also functions as an adhesion suppressing unit that suppresses the adhesive force of the adhesive to the main member 81.

  The main member 80 of the end plate is, for example, an aluminum alloy, and the sub member 90 is, for example, stainless steel that is a non-magnetic material. The linear expansion coefficient of the sub member 90 is closer to the linear expansion coefficient of the electrical steel sheet 52 than the linear expansion coefficient of the main member 80.

  An elastic body 92 is provided at the boundary between the main member 80 and the sub member 90 so as to reduce the difference in linear expansion coefficient between the main member 80 and the sub member 90. The elastic body 92 may be, for example, rubber or an adhesive having flexibility even when cured. As a result, even if the electromagnetic steel sheet and the sub member 90 are bonded by the adhesive 54 for fixing the permanent magnet, the stress is relaxed as compared with the conventional case, and fatigue damage of the electromagnetic steel sheet is prevented.

  FIG. 8 shows a modification of the second embodiment.

  In FIG. 8, the elastic body 92 is fitted in the vicinity of the hole for inserting the permanent magnet of the electromagnetic steel plate. Thereby, even if the magnetic steel sheet and the elastic body 92 are bonded with an adhesive for fixing the permanent magnet, the elastic body 92 is deformed when a heat cycle is applied, so that the stress applied to the magnetic steel sheet can be reduced. Therefore, fatigue failure of the electromagnetic steel sheet is prevented.

[Embodiment 3]
FIG. 9 is a diagram for explaining the rotor of the third embodiment.

  Referring to FIG. 9, in the third embodiment, release agent layers 70 and 71 are provided in advance by applying a release agent to the side of end plates 40 and 41 that are in contact with the electromagnetic steel sheet. The release material layers 70 and 71 serve as an adhesion suppressing portion that suppresses the adhesive force of the adhesive to the end plates 40 and 41.

  As specific examples of the mold release agent, for example, a silicon-based coating agent, a fluorine-based coating agent (Teflon (registered trademark) coat), or the like is used.

  This prevents the magnetic steel sheet 52 and the end plates 40, 41 from being bonded by the adhesive 54. Therefore, even if the end plates 40, 41 are expanded and contracted by a thermal cycle, the stress applied to the magnetic steel sheet 52 is increased. Can be small.

[Embodiment 4]
In the fourth embodiment, the adhesive 54 used in FIG. 11 is replaced with a filler having a low adhesive force to the end plates 40 and 41. This filler is a putty material that cures but has weak adhesion to surrounding members.

  As an example of the filler which is an example of the putty material, a dental adhesive which is used for dentistry or the like and hardly solidifies and solidifies and hardens can be considered as an example.

  It should be noted that other fillers such as caulking materials may be used as long as the magnets are prevented from rattling by being cured and filled in the gaps.

  As described above, according to the present embodiment, the electromagnetic steel plate and the end plate are prevented from being bonded, and the electromagnetic steel plate is subject to fatigue failure due to the difference in the linear expansion coefficient between the end plate and the electromagnetic steel plate. Can be prevented.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is sectional drawing of the rotor (rotor) of the rotary electric machine of this Embodiment. It is a figure for demonstrating the A section of FIG. 1 in detail. It is a flowchart for demonstrating the assembly process of a rotor. It is a figure for demonstrating the shape of the stainless steel plate 51. FIG. It is a figure for demonstrating the stress which acts on the electromagnetic steel plate in Embodiment 1. FIG. It is a figure for demonstrating the rotor of Embodiment 2. FIG. It is the figure which expanded and showed a part of end plate in FIG. FIG. 10 is a diagram showing a modification of the second embodiment. FIG. 10 is a diagram for illustrating a rotor according to a third embodiment. It is a figure for demonstrating the shape of the electromagnetic steel plate 52 used as a rotor iron core. It is a figure for demonstrating the cross-sectional part of the rotor corresponding to the XI-XI part in FIG. It is a figure for demonstrating the stress which acts between an end plate and an electromagnetic steel plate.

Explanation of symbols

  10 rotor, 20 shaft, 22 flange, 30 resolver, 32 snap ring, 40, 41 end plate, 50 rotor core, 51, 58 stainless steel plate, 52 electromagnetic steel plate, 54 adhesive, 56 permanent magnet, 61, 62 protrusion, 111, 112 Protrusions, 70, 71 Mold release agent layer, 80, 81 Main member, 90, 91 Sub member, 92 Elastic body, 101, 102 hole.

Claims (11)

A rotation axis;
An iron core portion disposed around the rotation axis and provided with a plurality of through holes;
A plurality of permanent magnets respectively accommodated in the plurality of through holes;
A filler filled in a gap between the permanent magnet and the iron core in each of the plurality of through holes;
A pair of end plates that sandwich the core from both sides so as to close the opening of the through hole;
A rotor of a rotating electrical machine, comprising: an adhesion suppressing portion that is provided at a boundary portion between the end plate and the iron core portion and suppresses adhesion between the end plate and the iron core portion due to the filler. The adhesion suppressing portion is a nonmagnetic member interposed in a gap between the pair of end plates and the iron core portion,
The rotation according to claim 1, wherein the difference between the linear expansion coefficient of the nonmagnetic member and the linear expansion coefficient of the iron core is smaller than the difference between the linear expansion coefficient of the end plate and the linear expansion coefficient of the iron core. Electric rotor.   The rotor of a rotating electrical machine according to claim 2, wherein the nonmagnetic member is a plate-shaped member formed so as to close at least the through hole.   The rotor of a rotating electrical machine according to claim 2 or 3, wherein the nonmagnetic member is made of stainless steel. The adhesion suppressing portion is a nonmagnetic member interposed in a gap between the pair of end plates and the iron core portion,
The rotor of a rotating electrical machine according to claim 1, wherein the nonmagnetic member is more elastic than the end plate.   The rotor of a rotating electrical machine according to claim 1, wherein the adhesion suppressing portion is a layer of a release agent applied to the end plate. The end plate is
A non-magnetic main member;
A non-magnetic sub member that fits into the main member and covers the hole,
The rotating electrical machine according to claim 1, wherein a difference between a linear expansion coefficient of the sub member and a linear expansion coefficient of the iron core is smaller than a difference between a linear expansion coefficient of the main member and a linear expansion coefficient of the iron core. Rotor.   The rotor of the rotating electrical machine according to claim 7, wherein the sub member is made of stainless steel. The end plate is
A non-magnetic main member;
A non-magnetic sub member fitted into the main member and covering the through hole,
The rotor of a rotating electrical machine according to claim 1, wherein the sub member is more elastic than the main member. A rotation axis;
An iron core portion disposed around the rotation axis and provided with a plurality of through holes;
A plurality of permanent magnets respectively accommodated in the plurality of through holes;
A pair of end plates that sandwich the core from both sides so as to close the opening of the through hole;
A filler filled in a gap between the permanent magnet and the iron core in each of the plurality of through holes;
The filler is a rotor of a rotating electrical machine, which is a putty material that cures but has weak adhesion to surrounding members. The iron core is
A plurality of ferromagnetic plates laminated in parallel to a plane perpendicular to the rotation axis,
The rotor for a rotating electrical machine according to claim 1, wherein each of the plate bodies is provided with a hole for forming the through hole by being laminated.

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