JP2014183663A - Rotor for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor for a rotary electric machine, which has a relatively simple configuration and is able to hinder discharge of magnet fixing filler to outside of the rotor.SOLUTION: In a rotor 10 for a rotary electric machine, an injection port 42 for filler F, by which a magnet insertion hole 25 and the outside of the rotor 10 communicate, is formed in a first end plate 40 so as to coincide with the inner circumferential side or outer circumferential side of the magnet insertion hole 25 in the direction of the rotation axis thereof. A space 28 is formed between the magnet insertion hole 25 and the circumferential end face 30c of a permanent magnet 30. A communication passage 45 by which the space 28 and the outside of the rotor 10 communicate is formed in a second end plate 41.

Description

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

  Conventionally, a rotor used in a rotating electrical machine is known in which a plurality of magnet insertion holes are provided in a rotor core in which a large number of electromagnetic steel plates are laminated, and permanent magnets are inserted into the respective magnet insertion holes (for example, Patent Document 1).

  For example, in the rotor 110 described in Patent Document 1, as shown in FIG. 9, the rotor core 120 is provided with a magnet insertion hole 122 that houses the permanent magnet 121, and the permanent magnet 121 is housed in the magnet insertion hole 122. And fixed with resin 129 as a filler. An injection groove 126 having a substantially semicircular cross section in which resin 129 is injected is formed along the rotation axis on the inner wall surface of the magnet insertion hole 122 on the rotation axis side, and is connected to the injection groove 126 on the end plate 130a. A substantially circular injection hole 131 is formed, and the injection nozzle 140 is connected to the injection hole 131 to inject the resin 129.

  An air gap 127 is formed between the magnet insertion hole 122 and the circumferential end surface of the permanent magnet 121, and the injection groove 126 and the air gap 127 are formed between the inner surface of the magnet insertion hole 122 and the outer surface of the permanent magnet 121. The flow path 128 of the resin 129 is formed through the gaps 128a and 128b. Further, outer circumferential grooves 125 and 135 are formed in the rotor core 120 and the end plate 130a, and an air vent groove 134 that connects the gap 127 and the outer circumferential grooves 125 and 135 to the end plate 130a in which the injection groove 131 is formed. Is formed.

Japanese Patent No. 4,605,481

By the way, in the rotor 110, as shown in FIG. 10A, when the resin 129 is injected, the gap 127 formed between the magnet insertion hole 122 and the circumferential end surface of the permanent magnet 121 has a resin 129. May be difficult to wrap around, and the air vent groove 134 may be filled with the resin 129 without the resin 127 filling the gap 127.
When the space A in which the resin 129 is not filled is formed in the gap 127 as described above, as shown in FIG. 10B, the bubbles expand during heating for resin curing. As a result, as shown in FIG. 10 (c), the resin 129 is ejected from the injection port 131, and as shown in FIG. 10 (d), the resin 129 adheres to the surface of the end plate 130a, resulting in contamination. There is a possibility that the resin 129 adhering to the surface of the end plate 130 a may escape to the outside of the rotor 110. If the resin 129 thus peeled enters the air gap between the rotor and the stator, the rotor or the stator may be damaged.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rotating electrical machine that can suppress the release of a magnet fixing filler to the outside of the rotor with a relatively simple configuration. Is to provide a rotor.

In order to achieve the above-mentioned object, the invention according to claim 1
A rotor core (for example, a rotor core 20 in an embodiment described later) in which a plurality of magnet insertion holes (for example, a magnet insertion hole 25 in an embodiment described later) is formed;
A plurality of permanent magnets inserted into the plurality of magnet insertion holes, respectively (for example, permanent magnet 30 in an embodiment described later);
A filler (for example, a filler F in an embodiment to be described later) filled in the magnet insertion hole in which the permanent magnet is inserted;
A first end plate and a second end plate (for example, a first end plate 40 and a second end plate 41 in the embodiments described later) that respectively cover end surfaces on both axial sides of the rotor core;
A rotor of a rotating electrical machine (e.g., a rotor 10 of a rotating electrical machine in an embodiment described later),
The first end plate has an injection port for the filler (for example, an injection port 42 in an embodiment described later) communicating with the magnet insertion hole and the outer side of the rotor, on the inner peripheral side of the magnet insertion hole or It is formed at a position that overlaps the outer peripheral side in the rotation axis direction,
A gap (for example, a gap 28 in an embodiment described later) is formed between the magnet insertion hole and a circumferential end face of the permanent magnet (for example, a circumferential end face 30c in the embodiment described later),
The second end plate is formed with a communication path (for example, a communication path 45 in an embodiment described later) that communicates the gap and the outside of the rotor.

In addition to the configuration of claim 1, the invention according to claim 2
The communication path is located on the opposite side in the radial direction from the injection port in the magnet insertion hole defining the gap.

In addition to the configuration of claim 1 or 2, the invention according to claim 3
The rotor core includes a plurality of outer peripheral grooves (for example, outer peripheral grooves 27 in the embodiments described later) that are recessed from the outer peripheral surface of the rotor core toward the inner diameter side, respectively.
The communication path is configured to communicate the gap and the outer circumferential groove by forming a groove portion (for example, a groove portion 46 in an embodiment described later) extending in the circumferential direction in the second end plate. It is characterized by that.

In addition to the configuration of claim 3, the invention according to claim 4
The groove portion is constituted by a plurality of linear groove portions (for example, linear groove portions 46a and 46b in the embodiments described later) extending from one side in the circumferential direction toward the other side in the circumferential direction.

The invention according to claim 5 includes, in addition to the configuration of claim 4,
The linear groove portions adjacent to each other in the circumferential direction are configured such that a part of each other overlaps when viewed from the radial direction,
Any one of the plurality of linear grooves is positioned with respect to an arbitrary circumferential position.

In addition to the configuration of claim 3, the invention according to claim 6
The groove is formed in an annular shape over the entire circumference of the second end plate.

According to the first aspect of the present invention, the second end plate is provided with a communication path that communicates the gap formed between the magnet insertion hole and the circumferential end surface of the permanent magnet and the outside of the rotor. Even in the case where a space (bubbles) that is not filled with the filler is formed on the second end plate side in the gap, the bubbles (air) can escape through the communication path during heating.
Accordingly, it is possible to prevent bubbles from expanding and blowing out the filler from the injection port during heating for resin curing, and the filler adheres to the surface of the end plate and becomes contaminated. Can be suppressed.

  According to the invention of claim 2, since the outside of the rotor is communicated with the gap at a position where the filler is difficult to enter, the communication path can be prevented from being blocked by the filler, and the gap When air bubbles are generated in the rotor, the generated air bubbles can be surely released to the outside of the rotor.

  According to invention of Claim 3, a communicating path can be formed by forming a groove part in a 2nd end plate, and formation of a communicating path can be performed easily.

  According to invention of Claim 4, since a groove part is comprised by several linear groove part, a groove part can be processed easily and the increase in manufacturing cost can be suppressed.

  According to the invention of claim 5, the outer peripheral groove and the groove portion can be communicated with each other without phasing the second end plate, and the rotor can be assembled easily.

  According to the invention of claim 6, the outer peripheral groove and the groove portion can be communicated with each other without phasing the second end plate, and the rotor can be assembled easily.

It is a front view which shows the rotor of the rotary electric machine concerning one Embodiment of this invention. It is sectional drawing along the II-II line of FIG. It is the principal part enlarged front view which notched the 1st end plate partially and looked at the rotor from the 1st end plate side. It is the principal part enlarged front view which notched the 2nd end plate partially and looked at the rotor from the 2nd end plate side. It is an enlarged front view of a 2nd end plate. (A)-(d) is sectional drawing along the VI-VI line of FIG. 3 for demonstrating the injection | pouring process of the air of the rotor of FIG. (A) is an expansion front view of the 2nd end plate concerning the 1st modification of this embodiment, (b) is an expansion showing the 2nd end plate concerning the 2nd modification of this embodiment. It is a front view. It is an enlarged front view which shows the 2nd end plate which concerns on the 3rd modification of this embodiment. It is a principal part perspective view which shows the conventional rotor with an air vent path | route. (A)-(d) is sectional drawing along the XX line of FIG. 9 for demonstrating the injection | pouring process of the air of the conventional rotor.

  Hereinafter, a rotor of a rotating electrical machine according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

  As shown in FIGS. 1 and 2, the rotor 10 of the rotating electrical machine according to the present embodiment includes a substantially cylindrical rotary shaft 11, a rotor core 20 attached to the outer peripheral side of the rotary shaft 11, and a plurality of rotor cores 20 attached to the rotor core 20. A permanent magnet 30 is provided and is disposed inside a stator (not shown).

  The rotor core 20 is formed by laminating a number of electromagnetic steel plates (for example, silicon steel plates) 21 on a disc having the same shape (see FIG. 2). The rotor core 20 is provided with a plurality of magnet insertion holes 25 in the circumferential direction, and the rotor core 20 is disposed at a predetermined interval for each pair of magnet insertion holes 25. The magnet insertion holes 25 are formed in a substantially rectangular shape when viewed from the axial direction, and the center ribs 26 are formed such that the pair of magnet insertion holes 25 forms a center rib 26 extending in the radial direction therebetween. Are arranged symmetrically with respect to each other (see FIG. 3).

  Each permanent magnet 30 is inserted into each magnet insertion hole 25 while changing the direction of the magnetic pole for each pair of magnet insertion holes 25. For example, in the two permanent magnets 30a, if the outer peripheral side is an N pole, they are adjacent to each other. In the two permanent magnets 30b, the outer peripheral side is the S pole. In the present embodiment, as shown in FIG. 2, four permanent magnets 30 are arranged in the axial direction in each magnet insertion hole 25.

  The magnet insertion hole 25 has an injection groove 25a having a substantially semicircular cross section at the center of the inner diameter side wall surface, and a filler is inserted into the magnet insertion hole 25 into which the permanent magnet 30 is inserted from the injection groove 25a. F is filled.

  Furthermore, a pair of outer peripheral grooves 27 that are recessed toward the inner diameter side are provided on the outer peripheral surface of the rotor core 20 on both sides in the circumferential direction of the pair of magnet insertion holes 25. Further, a gap 28 is formed between the magnet insertion hole 25 and the circumferential end face 30 c of the permanent magnet 30. Therefore, the portion of the rotor core 20 that partitions the outer peripheral groove 27 and the gap 28 is formed in a rib shape.

  As shown in FIG. 2, first and second end plates 40 and 41 are attached to both ends of the rotor core 20 in the axial direction so as to cover the axial end surfaces. The rotor core 20 is formed by attaching the second end plate 41 to the rotary shaft 11 and then laminating the electromagnetic steel plates 21 and press-fitting the rotary shaft 11. Then, after the permanent magnet 30 is inserted into the magnet insertion hole 25 of the rotor core 20 and the first end plate 40 is attached to the rotating shaft 11, the collar member 50 as a fixing member is press-fitted into the rotating shaft 11. Thereby, the collar member 50 sandwiches the first and second end plates 40 and 41 together with the rotor core 20 in the axial direction, and the first and second end plates 40 and 41 and the rotor core 20 are pivoted by the collar member 50. Directional load is applied.

As shown in FIGS. 2 and 3, the first end plate 40 includes the injection grooves 25 a of the plurality of magnet insertion holes 25 and the rotor 10 at positions that partially overlap with the injection grooves 25 a when viewed from the rotation axis direction. The same number of inlets 42 as the magnet insertion holes 25 are formed so as to communicate with the outer side thereof in the rotation axis direction.
In the present embodiment, the injection port 42 is provided corresponding to the injection groove 25 a provided on the inner peripheral side of the magnet insertion hole 25, but the injection groove is provided on the outer peripheral side of the magnet insertion hole 25. If it is, it may be formed at a position partially overlapping with the injection groove.

  A plurality of outer peripheral grooves 43 are formed on the outer peripheral surface of the first end plate 40 at positions corresponding to the outer peripheral grooves 27 of the rotor core 20. An air vent groove 44 having a length that allows the outer circumferential groove 43 and the gap 28 to communicate with each other is formed on the surface of the first end plate 40 facing the rotor core 20.

  On the other hand, as shown in FIG. 4, the second end plate 41 has a circular outer peripheral surface and is formed in a ring shape. Further, the second end plate 41 is formed with a circumferentially extending groove portion 46 that constitutes a communication passage 45 that communicates the gap 28 and the outer peripheral groove 27 of the rotor core 20.

  As shown in FIG. 5, the groove portion 46 includes a plurality of linear groove portions 46 a and 46 b extending from one side in the circumferential direction toward the other side in the circumferential direction. Further, the linear groove portions 46a and 46b adjacent in the circumferential direction are configured such that a part of each other overlaps when viewed from the radial direction. Thereby, it is comprised so that either of the some linear groove part 46a, 46b may be located with respect to arbitrary circumferential direction positions.

As shown in FIG. 4, in the present embodiment, the circumferential length LA in which the mutually parallel inner diameter side ends of the linear groove portions 46 a and 46 b overlap each other is the circumferential length of the center rib 26. The circumferential length LB that is longer than L1 and overlaps the outer diameter side ends of the adjacent linear groove portions 46a and 46b is longer than the circumferential length L2 of the communication passage 45.
Therefore, the circumferential lengths LA and LB at which the inner diameter side ends and the outer diameter side ends overlap each other are the circumferential length L1 of the center rib 26 and the circumferential length L2 of the communication path 45. Since it is set longer than either of these, the communication passage 45 that connects the gap 28 and the outer peripheral groove 27 of the rotor core 20 can be reliably configured regardless of the phase of the second end plate 41.

  The communication passage 45 is located on the opposite side in the radial direction from the injection port 42 in the magnet insertion hole 25 that defines the gap 28. That is, in the present embodiment, the communication path 45 constituted by the straight groove portions 46a and 46b is located on the outer diameter side with respect to the straight line S passing through the radial intermediate position of the magnet insertion hole 25 (see FIG. 4). ).

  In the rotor 10 configured as described above, as shown in FIG. 6A, the filler F is injected into the injection groove 25 a through the injection port 42, and the inner periphery side of the permanent magnet 30 and the magnet insertion hole 25. The permanent magnet 30 is fixed by pressing the permanent magnet 30 in the radial direction. At this time, the filler F is unlikely to enter the gap 28 formed between the magnet insertion hole 25 and the circumferential end face 30 c of the permanent magnet 30, and the air vent groove 44 is formed in the first end plate 40. Even in such a case, the air vent groove 44 may be filled with the filler without filling the gap 28 with the filler F.

  Even in such a case, in the present embodiment, since the communication path 45 communicating with the gap 28 and the outer circumferential groove 27 is formed between the second end plate 41 and the rotor core 20, FIG. As shown in b), even when the bubbles in the space A not filled with the filler F are expanded at the time of heating for resin curing, the bubbles (air) can be released through the communication path. . As a result, as shown in FIGS. 6C and 6D, the filler F is prevented from being ejected from the injection port 42 even in the process where the filler F gradually flows downward and cures. It is possible to prevent the filler F from adhering to the surface of the first end plate 40 and causing contamination.

As described above, according to the rotor 10 of the rotating electrical machine according to the embodiment of the present invention, the first end plate 40 is filled with the filler F that communicates the magnet insertion hole 25 and the outside of the rotor 10. The inlet 42 is formed at a position overlapping the inner peripheral side or the outer peripheral side of the magnet insertion hole 25 in the rotation axis direction, and a gap 28 is formed between the magnet insertion hole 25 and the circumferential end face 30c of the permanent magnet 30. The second end plate 41 is formed with a communication passage 45 that communicates the gap 28 with the outside of the rotor 10. As a result, even in the case where the space A in which the filler F is not filled is formed on the second end plate 41 side in the space 28 where the filler F is difficult to enter, air bubbles (air ) Can be missed.
Therefore, it is possible to suppress the expansion of bubbles during the heating for resin curing and the injection of the filler F from the injection port 42, and the filler F adheres to the surface of the first end plate 40. Thus, contamination can be suppressed.

  Further, since the communication passage 45 is located on the opposite side in the radial direction from the injection port 42 in the magnet insertion hole 25 that defines the air gap 28, the communication path 45 is located at a position where the filler F is difficult to enter, The communication passage 45 can be prevented from being blocked by the filler F, and when bubbles are generated in the gap 28, the generated bubbles are transferred to the outside of the rotor 10. Can be surely escaped.

  Further, the rotor core 20 includes a plurality of outer peripheral grooves 27 that are recessed from the outer peripheral surface of the rotor core 20 toward the inner diameter side, and the communication path 45 forms a groove portion 46 extending in the circumferential direction in the second end plate 41. Thus, the gap 28 and the outer peripheral groove 27 are configured to communicate with each other, and the communication passage 45 can be easily formed.

  In addition, the groove portion 46 is constituted by a plurality of linear groove portions 46a and 46b extending from one side in the circumferential direction toward the other side in the circumferential direction. Therefore, the groove portion 46 can be easily processed, and the manufacturing cost can be reduced. Increase can be suppressed.

  Further, the linear groove portions 46a and 46b adjacent in the circumferential direction are configured such that a part of each of the linear groove portions 46a and 46b overlap each other when viewed from the radial direction, and a plurality of straight lines are formed with respect to any circumferential position. One of the groove portions 46a and 46b is configured to be positioned. Accordingly, the outer circumferential groove 27 and the groove portion 46 can be communicated with each other without phasing the second end plate 41, and the rotor 10 can be easily assembled.

The rotor of the rotating electrical machine of the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
For example, in the said embodiment, although the groove part 46 was comprised by a pair of linear groove part 46a, 46b mutually parallel, the groove part of this invention is not limited to this. For example, as in the first modification shown in FIG. 7A, the groove portion may be a linear groove portion 46c that extends inclinedly from a predetermined outer peripheral position T1 to a predetermined inner peripheral position T2. Also in this case, when viewed from the radial direction, adjacent groove portions 46c overlap each other, that is, an outer diameter side end portion 46c1 of one groove portion 46c and an inner diameter side end portion 46c2 of the other groove portion 46c overlap. Is configured to do.

  Further, as in the second modification shown in FIG. 7B, linear groove portions 46d and 46e having different radial heights may be alternately arranged. However, in this case, since the adjacent groove portions 46c do not overlap each other when viewed from the radial direction, it is necessary to phase align the rotor core 20 and the second end plate 41.

  Furthermore, the groove part of this invention may be comprised by the annular groove part 46f formed over the perimeter of the 2nd end plate 41 like the 3rd modification shown in FIG. Also in this case, the outer peripheral groove 27 and the groove portion 46f can be communicated with each other without aligning the rotor core 20 and the second end plate 41, and the rotor can be easily assembled. The annular groove 46f is preferably processed with a laser.

  In addition, as the filler, any resin may be applied as long as it is a thermosetting resin. For example, an epoxy resin having oil resistance may be applied.

DESCRIPTION OF SYMBOLS 10 Rotating machine rotor 20 Rotor core 21 Magnetic steel plate 25 Magnet insertion hole 27 Outer peripheral groove 28 Gap 30 Permanent magnet 40 First end plate 41 Second end plate 42 Inlet 43 Outer peripheral groove 46 Grooves 46a, 46b, 46c, 46d, 46e Linear groove 46f Annular groove F Filler

Claims (6)

A rotor core formed with a plurality of magnet insertion holes;
A plurality of permanent magnets respectively inserted into the plurality of magnet insertion holes;
A filler filled in the magnet insertion hole into which the permanent magnet is inserted;
A first end plate and a second end plate that respectively cover end faces on both axial sides of the rotor core;
A rotor of a rotating electrical machine comprising:
In the first end plate, the filler inlet for communicating the magnet insertion hole and the outside of the rotor is formed at a position overlapping with the inner peripheral side or the outer peripheral side of the magnet insertion hole in the rotation axis direction. ,
A gap is formed between the magnet insertion hole and the circumferential end surface of the permanent magnet,
A rotor of a rotating electrical machine, wherein a communication path that connects the gap and the outside of the rotor is formed in the second end plate.   2. The rotor of a rotating electrical machine according to claim 1, wherein the communication path is located on a side opposite to the injection port in a radial direction in the magnet insertion hole that defines the gap. The rotor core includes a plurality of outer peripheral grooves that are recessed from the outer peripheral surface of the rotor core toward the inner diameter side,
The said communication path is comprised so that the said space | gap and the said outer periphery groove | channel may be connected by forming the groove part extended in the said circumferential direction in the said 2nd end plate. The rotor of the rotary electric machine described in 1.   4. The rotor of a rotating electrical machine according to claim 3, wherein the groove is configured by a plurality of linear grooves extending from one side in the circumferential direction toward the other side in the circumferential direction. The linear groove portions adjacent to each other in the circumferential direction are configured such that a part of each other overlaps when viewed from the radial direction,
5. The rotor of a rotating electrical machine according to claim 4, wherein any of the plurality of linear grooves is positioned with respect to an arbitrary circumferential position.   The rotor of a rotating electrical machine according to claim 3, wherein the groove is formed in an annular shape over the entire circumference of the second end plate.

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