JP5941836B2 - Rotating electrical machine rotor - Google Patents

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, (See Patent Documents 1 and 2).

  For example, in the rotor 110 shown in FIG. 7, the rotor core 111 is provided with a magnet insertion hole 116 for accommodating the permanent magnet 113, and the permanent magnet 113 is accommodated in the magnet insertion hole 116 and fixed with a resin 117 as a filler. Is done. Further, an injection groove 116a having a substantially semicircular cross section in which the resin 117 is injected is formed along the rotation axis on the inner wall surface on the rotation axis side of the magnet insertion hole 116, and the end plate 114 is connected to the injection groove 116a. A substantially circular injection hole 114a is formed, an injection nozzle is connected to the injection hole 114a, and the resin 117 is injected.

  Further, as shown in FIG. 8, in the rotor 210 described in Patent Document 1, a permanent magnet 213 is inserted into a magnet insertion hole 216 formed in the rotor core 211, and the end plate 214 has a surface facing the rotor core 211. The formed recess 214a and a through hole 214b that penetrates the outer surface of the end plate 214 and the recess 214a are provided. The filler 217 is injected from the through hole 214b into the magnet insertion hole 216 via the recess 214a, thereby fixing the permanent magnet 213 and simultaneously absorbing the unevenness of the axial end surfaces of the rotor core 211 and the end plate 214. It is described to do.

JP 2008-199725 A Japanese Patent No. 4731920

  By the way, in the rotor 110 shown in FIG. 7, the injection hole 114a and the injection hole are injected due to a difference in thermal expansion between the rotor core 111 and the end plate 114 and a centrifugal force during rotation due to a weight difference between the rotor core 111 and the end plate 114. There is a possibility that cracks may occur in the resin 117 in the groove 116a. For this reason, the resin 117a remaining in the injection hole 114a may be peeled off, and the peeled resin 117a may come out of the rotor 110. If the resin 117a thus peeled enters the air gap between the rotor and the stator, the rotor or the stator may be damaged.

  Further, in the rotor 210 shown in FIG. 8, the filler 217 can be poured into the recess 214a of the end plate 214 to prevent the filler 217 cured in the recess 214a from being peeled off. There is a problem that the groove processing of 214a is necessary and the cost is increased, the filling pressure when filling the filler 217 is increased, and the filling state cannot be confirmed from the outside of the end plate 214.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to suppress the discharge of the magnet fixing filler to the outside of the rotor with a relatively simple configuration, and to prevent peripheral components from being released. An object of the present invention is to provide a rotor of a rotating electrical machine that can suppress damage or leakage of a filler into oil.

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;
An end plate that covers the axial end surface of the rotor core (for example, an end plate 41 in an embodiment described later);
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 rotor of a rotating electrical machine (e.g., a rotor 10 of a rotating electrical machine in an embodiment described later),
The end plate is formed with an inlet for the filler (for example, an inlet 42 in an embodiment described later) that communicates the magnet insertion hole and the outside of the end plate in the rotation axis direction.
The injection port is disposed at a position partially overlapping with an injection groove (for example, an injection groove 25a in an embodiment described later) formed between the magnet insertion hole and the permanent magnet when viewed from the rotation axis direction. And the opening area (for example, opening area A in the embodiment described later) in the rotor core side opening (for example, rotor core side opening 43 in the embodiment described later) of the end plate is the outer opening (for example, described later) of the end plate. It is characterized by being larger than an opening area (for example, an opening area B in an embodiment described later) in the outer opening 44 in the embodiment.

In addition to the configuration of claim 1, the invention according to claim 2
The injection port has a taper portion (for example, a taper portion 45 in an embodiment described later) having an opening area that decreases from the rotor core side opening toward the outer opening.

In addition to the structure of claim 1, the invention according to claim 3
The injection port has a core-side opening (for example, a core-side opening 43a in an embodiment described later) having a uniform shape along the rotation axis direction from the rotor core-side opening, and the rotation opening direction from the outer opening. And an outer opening having a uniform shape (for example, an outer opening 44a in an embodiment described later) is formed into a stepped shape by being continuous,
The opening area of the core side opening is larger than the opening area of the outer opening,
An axial width of the core side opening (for example, an axial width h1 in an embodiment described later) is larger than an axial width of the outer opening (for example, an axial width h2 in an embodiment described later). And

In addition to the structure of any one of claims 1 to 3, the invention according to claim 4
An opening area of the inlet at the rotor core side opening is larger than a gap area formed between the magnet insertion hole and the permanent magnet (for example, a gap area C in an embodiment described later). .

The invention according to claim 5 includes, in addition to the configuration of claim 4,
An opening area of the outer opening of the injection port is formed to be equal to or smaller than a gap area formed between the magnet insertion hole and the permanent magnet.

In addition to the structure of any one of claims 1 to 5, the invention according to claim 6
The filler is made of a resin having oil resistance.

According to the first aspect of the present invention, it is possible to prevent a part of the filler contained in the injection port from dropping out of the rotor from the injection port during operation of the rotating electrical machine. Therefore, it is possible to suppress the filler from being discharged to the outside of the rotor, and it is possible to suppress damage to peripheral parts or outflow into the oil.
Moreover, since an additional part for closing the injection port is not necessary, an increase in cost can be suppressed.
Furthermore, since the injection port communicates the magnet insertion hole and the outer side of the end plate in the direction of the rotation axis, the injection pressure when injecting the filler can be relatively small, thereby suppressing the increase in size of the equipment. be able to. Further, since it is possible to confirm the injection state of the filler from the outside of the rotor, the reliability of the rotor can be improved.

According to the second aspect of the present invention, when a predetermined amount of filler is injected into the magnet insertion hole, the excess filler is accommodated in the injection port. Depending on the amount of filler, there is a variation in the amount of filler that is excessive, and the amount (height) of filler that is accommodated in the inlet may differ. However, even in this case, the filler in the inlet broken by the crack is locked to the portion near the outer opening of the tapered portion with a small opening area, and remains on the rotor core side of the tapered portion with a large opening area. The loss of the filler can be suppressed more reliably.
Moreover, since the punching die for forming the tapered portion can be configured relatively easily, an increase in manufacturing cost can be suppressed.

According to invention of Claim 3, the intensity | strength of the collar part of the core side opening part of a filler can be made high, and generation | occurrence | production of a crack can be suppressed.
Moreover, since the space for accommodating the surplus filler can be increased, the overflow of the filler to the outside of the end plate can be effectively suppressed.

  According to the fourth aspect of the present invention, during filling, it is possible to prevent excess filler from being stored in the injection port and to overflow to the outside of the end plate, and to overflow to the outside of the end plate. It can suppress that the filler adhering to the end plate becomes a contamination.

  According to the fifth aspect of the present invention, even if the excess filler accommodated in the injection port does not spread over the entire opening on the rotor core side (even if it rises and hardens), it is on the outside. It can suppress falling out.

  According to the invention of claim 6, even when a relatively hard oil-resistant resin is used as the filler, it is possible to suppress the release of the cured resin to the outside of the rotor, and damage to peripheral parts. Or the outflow into oil can be suppressed.

It is a front view which shows the rotor of the rotary electric machine concerning one Embodiment of this invention. (A) is the II section enlarged front view of the rotor of FIG. 1, (b) is sectional drawing along the II'-II 'line of (a). It is the III section enlarged view of FIG.2 (b) which shows the state by which a filler is latched in an injection hole. (A) is a principal part enlarged front view corresponding to Drawing 2 (a) concerning the 1st modification of this embodiment, and (b) is a sectional view corresponding to Drawing 2 (b). (A) is a principal part enlarged front view corresponding to Drawing 2 (a) concerning the 2nd modification of this embodiment, and (b) is a sectional view corresponding to Drawing 2 (b). (A) is a principal part enlarged front view corresponding to Drawing 2 (a) concerning the 3rd modification of this embodiment, and (b) is a sectional view corresponding to Drawing 2 (b). It is principal part sectional drawing of the conventional rotor. It is principal part sectional drawing of the other 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. 2B). 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 in line symmetry.

  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.

  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. As the filler F, among the thermosetting resins, an epoxy resin having oil resistance is particularly applied in the present embodiment.

  Further, as shown in FIG. 2B, end plates 40 and 41 are attached to both end portions of the rotor core 20 in the axial direction so as to cover the end surfaces in the axial direction. The rotor core 20 is formed by attaching the end plate 40 to the rotating shaft 11 and then laminating the electromagnetic steel plates 21 and press-fitting the rotating plate 11. Then, after inserting the permanent magnet 30 into the magnet insertion hole 25 of the rotor core 20 and attaching the end plate 41 to the rotating shaft 11, the collar member 50 as a fixed member is press-fitted into the rotating shaft 11. Accordingly, the collar member 50 sandwiches the end plates 40 and 41 together with the rotor core 20 in the axial direction, and the end plates 40 and 41 and the rotor core 20 are given an axial load by the collar member 50.

  2A and 2B, the plurality of magnet insertion holes 25 are injected into the end plate 41 at a position partially overlapping with the injection groove 25a when viewed from the rotation axis direction. The same number of inlets 42 as the number of the magnet insertion holes 25 are formed to communicate the grooves 25a and the outside of the end plate 41 in the direction of the rotation axis.

  The inlet 42 has a tapered portion 45 whose opening area decreases from the circular rotor core side opening 43 having a diameter a1 toward the circular outer opening 44 having a diameter b1. The rotor core side opening 43 and the outer opening 44 are concentric. Is formed. Therefore, the opening area A in the rotor core side opening 43 of the end plate 41 is designed to be larger than the opening area B in the outer opening 44 of the end plate 41.

  The opening area A of the inlet 42 in the rotor core side opening 43 is designed to be larger than the gap area C of the injection groove 25 a formed between the magnet insertion hole 25 and the permanent magnet 30. The clearance area C represents the area surrounded by the arc along the injection groove 25a and the permanent magnet 30.

  Accordingly, the filler F is injected into the injection groove 25a through the injection port 42 and hardens, thereby fixing the permanent magnet 30 in the magnet insertion hole 25. In addition, since the injection port 42 is configured to communicate the magnet insertion hole 25 and the outside of the end plate 41 in the direction of the rotation axis, the injection pressure when injecting the filler F may be relatively small, and the filler The injection state of F can be confirmed from the outside of the rotor.

  In addition, since the opening area A in the rotor core side opening 43 of the injection port 42 is designed to be larger than the gap area C of the injection groove 25a formed between the magnet insertion hole 25 and the permanent magnet 30, the fixed filling is performed. At this time, it is possible to prevent excess filler F from being accommodated in the inlet 42 and overflowing to the outside of the end plate 41, and overflowing to the outside of the end plate 41 to adhere to the end plate 41. However, it can suppress that it becomes a contamination.

  Further, the hardened filler F is injected into the injection port 42 and the injection groove 25a due to a difference in thermal expansion between the rotor core 20 and the end plate 41 and a difference in centrifugal force during rotation due to a weight difference between the rotor core 20 and the end plate 41. There is a possibility that cracks Cr may enter the filler F.

  In particular, when a predetermined amount of filler F is injected into the injection groove 25a, the excess filler is accommodated in the injection port 42, but due to the dimensional tolerance of the magnet insertion hole 25 or the permanent magnet 30. There may be variations in the amount of filler F that becomes excessive, and the amount (height) of filler contained in the injection port 42 may be different. However, even in this case, as shown in FIG. 3, the filler F ′ in the injection port 42 ruptured by the crack is locked to a portion near the outer opening 44 of the tapered portion 45 having a small opening area, Since the taper portion 45 having a large opening area remains on the rotor core side, it is possible to more reliably suppress the filler F ′ from coming off.

As described above, according to the rotor 10 of the rotating electrical machine according to this embodiment of the present invention, the end plate 41 communicates with the magnet insertion hole 25 and the outer side of the end plate 41 in the rotation axis direction. An F inlet 42 is formed, and the inlet 42 has an opening area A in the rotor core side opening 43 of the end plate 41 larger than an opening area B in the outer opening 44 of the end plate 41. Thereby, it can suppress that a part of filler F accommodated in the injection port 42 falls out of the rotor from the injection port 42 during operation of the rotating electrical machine. Therefore, it is possible to suppress the filler F from being discharged to the outside of the rotor, and it is possible to suppress damage to peripheral parts or outflow into the oil.
Moreover, since an additional part for closing the injection port 42 is not necessary, an increase in cost can be suppressed.
Further, since the injection port 42 communicates the magnet insertion hole 25 and the outside of the end plate 41 in the direction of the rotation axis, the injection pressure when injecting the filler F can be relatively small. Can be suppressed. Moreover, since the injection state of the filler F can be confirmed from the outside of the rotor, the reliability of the rotor 10 can be improved.

Further, since the injection port 42 has a tapered portion 45 whose opening area becomes smaller from the rotor core side opening 43 toward the outer opening 44, when a predetermined amount of the filler F is injected into the injection groove 25a, surplus is provided. The filler F thus formed is accommodated in the injection port 42, but there is a variation in the amount of the filler F that becomes excessive due to the dimensional tolerance of the magnet insertion hole 25 or the permanent magnet 30. This is a case where the amount (height) of the filler contained in the container is different. However, even in this case, since the filler F located on the side of the tapered portion 45 having the larger opening area is locked to the side of the tapered portion 45 having the smaller opening area, the filler F can be more reliably removed. Can be suppressed.
Moreover, since the punching die for forming the tapered portion 45 can be configured relatively easily, an increase in manufacturing cost can be suppressed.

  The opening area A of the inlet 42 in the rotor core side opening 43 is designed to be larger than the gap area C of the injection groove 25 a formed between the magnet insertion hole 25 and the permanent magnet 30. Thereby, at the time of fixed-quantity filling, while the surplus filler is accommodated in the injection port 42, it can suppress that it overflows to the outer side of the end plate 41, and it overflows to the outer side of the end plate 41. It can suppress that the filler F adhering to the end plate 41 becomes a contamination.

  Further, even when a relatively hard and oil-resistant epoxy resin is used as the filler F, it is possible to suppress the release of the hard epoxy resin to the outside of the rotor after curing, and damage to peripheral parts or oil The outflow to the inside can be suppressed.

(First modification)
FIG. 4 shows a rotor of a rotating electrical machine of a first modified example in which the shape of the inlet 42 of the end plate 41 is different. In this modification, the inlet 42 has a core-side opening 43a having a uniform circular shape with a diameter a2 along the rotation axis direction from the rotor core-side opening 43, and a diameter b2 from the outer opening 44 along the rotation axis direction. The outer opening 44a having a uniform circular shape is continuously formed to form a stepped shape. Therefore, also in this modified example, the opening area A of the core side opening 43a is larger than the opening area B of the outer opening 44a, and a part of the filler F accommodated in the injection port 42 as in the above embodiment. However, it can suppress falling out of the rotor. The effect of.

  Further, the axial width h1 of the core side opening 43a is larger than the axial width h2 of the outer opening 44a. Thereby, the intensity | strength of the collar part of the core side opening part 43a of the hardening filler F can be made high, and generation | occurrence | production of a crack can be suppressed. Moreover, since the space for accommodating the excess filler F can be enlarged, it is possible to effectively suppress overflowing to the outside of the end plate 41.

(Second modification)
FIG. 5 shows a rotor of a rotating electrical machine of a second modified example in which the shape of the inlet 42 of the end plate 41 is different. In this modified example, similarly to the first modified example, the injection port 42 is formed from a core-side opening 43a having a uniform circular shape with a diameter a2 along the rotation axis direction from the rotor core-side opening 43, and an outer opening 44. A stepped shape is formed by continuing the outer opening 44a having a uniform circular shape with a diameter b2 'along the rotation axis direction.

  On the other hand, in the second modified example, the diameter b2 ′ of the outer opening 44a is designed to be smaller than that in the first modified example, and the opening area B in the outer opening 44 is equal to that between the magnet insertion hole 25 and the permanent magnet 30. It is formed below the gap area C of the injection groove 25a formed therebetween. For this reason, even if the excess filler F accommodated in the injection port 42 does not spread over the entire opening on the rotor core side (even if it rises and hardens), it will fall out to the outside. This can be suppressed.

(Third Modification)
FIG. 6 shows a rotor of a rotating electrical machine of a third modified example in which the shape of the inlet 42 of the end plate 41 is different. In the inlet 42 of this modified example, the outer opening 44a has a uniform circular shape with a diameter b2 along the rotation axis direction from the outer opening 44, as in the first modified example, while the core-side opening 43a It is formed in an oval shape extending substantially along the circumferential direction and having a width dimension a3 longer than the diameter b2, and is formed in a stepped shape.

Thereby, it can suppress that a part of filler F accommodated in the injection port 42 falls out of a rotor like the said embodiment. In addition, in the case of constant pressure filling that fills up to the outer opening of the injection port 42, the resin filling amount can be reduced as compared with a simple circular shape.
In this modification, the elliptical core-side opening 43a extends substantially along the circumferential direction, but may extend along the radial direction.

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.
The shape of the rotor side opening 43 and the outer opening 44 of the end plate 41 of the present invention is not limited to the circular shape of the above embodiment as long as the opening area A in the rotor core side opening 43 is larger than the opening area B in the outer opening 44. It is not limited to an oval shape, and can be designed in an arbitrary shape.
Moreover, as a filler, it is not limited to the epoxy resin of this embodiment, Other resin may be applied.

DESCRIPTION OF SYMBOLS 10 Rotating machine rotor 20 Rotor core 21 Magnetic steel plate 25 Magnet insertion hole 30 Permanent magnet 41 End plate 42 Inlet 43 Rotor core side opening 43a Core side opening 44 Outer opening 44a Outer opening 45 Tapered part F Filler

Claims (6)

A rotor core formed with a plurality of magnet insertion holes;
An end plate covering the axial end surface of the rotor core;
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 rotor of a rotating electrical machine comprising:
The end plate is formed with an inlet for the filler, which communicates the magnet insertion hole and the outside of the end plate in the rotation axis direction.
The injection port is disposed at a position partially overlapping with an injection groove formed between the magnet insertion hole and the permanent magnet when viewed from the rotation axis direction, and an opening in the rotor core side opening of the end plate A rotor of a rotating electrical machine, wherein an area is larger than an opening area in an outer opening of the end plate.   2. The rotor of a rotating electrical machine according to claim 1, wherein the injection port has a tapered portion whose opening area decreases from the rotor core side opening toward the outer opening. The inlet has a core side opening having a uniform shape along the rotation axis direction from the rotor core side opening, and an outer opening having a uniform shape along the rotation axis direction from the outer opening. Is formed into a stepped shape,
The opening area of the core side opening is larger than the opening area of the outer opening,
2. The rotor of a rotating electrical machine according to claim 1, wherein an axial width of the core side opening is larger than an axial width of the outer opening.   The opening area in the said rotor core side opening of the said injection hole is larger than the clearance gap area formed between the said magnet insertion hole and the said permanent magnet, The any one of Claim 1 to 3 characterized by the above-mentioned. The rotor of a rotating electric machine.   5. The rotor of a rotating electrical machine according to claim 4, wherein an opening area in the outer opening of the injection port is formed to be equal to or less than a clearance area formed between the magnet insertion hole and the permanent magnet. .   The rotor of a rotating electrical machine according to any one of claims 1 to 5, wherein the filler is made of a resin having oil resistance.

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