Motor rotor

Abstract

The rotor 10 of the present invention comprises: a rotor core 30 supported by a rotating shaft 20 and composed of a plurality of electromagnetic steel plates 35 stacked in the vertical direction Z; a magnet insertion hole 40 formed in the rotor core 30 and extending in the vertical direction Z; a magnet 50 inserted into the magnet insertion hole 40; a first end panel 60 disposed above the rotor core 30 to prevent the magnet 50 from falling off from above and composed of a non-magnetic material; and a second end panel 70 disposed below the rotor core 30 to prevent the magnet 50 from falling off from below and composed of a non-magnetic material; the thickness TB of the second end panel 70 in the vertical direction Z is thinner than the thickness TA of the first end panel 60 in the vertical direction Z.

Description

Technical Field

[0001] This invention relates to a rotor of a motor. Prior Technology

[0002] Previously, a motor rotor included: a rotor core composed of a plurality of electromagnet plates; magnets inserted into magnet insertion holes formed in the rotor core; and end panels disposed at both ends of the rotor core in the axial direction to prevent the inserted magnets from falling off the rotor core. For example, Patent Document 1 discloses a motor rotor having end panels (i.e., end panels) of non-magnetic bodies disposed at both ends of the rotor core and serving as anti-detachment components for permanent magnets. [Preliminary Technology Documents] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2007-181254 Summary of the Invention

[0004] [The problem the invention aims to solve] However, in Patent Document 1, because end panels, which serve as anti-detachment components for permanent magnets, are required at both ends of the rotor core, the axial length of the motor rotor increases, potentially leading to a larger motor. Furthermore, the end panels also increase the rotor's weight. Moreover, the increased weight due to the end panels may also result in an increase in the rotor's moment of inertia.

[0005] The present invention was made in view of this point, and its object is to provide a motor rotor that can reduce the axial length, weight and moment of inertia of the rotor. [Technical means to solve the problem]

[0006] The rotor of the motor of the present invention comprises: a rotating shaft extending in a first direction; a rotor core supported by the rotating shaft and composed of a plurality of electromagnetic steel plates stacked in the first direction; a magnet insertion hole formed in the rotor core and extending in the first direction; a magnet inserted into the magnet insertion hole; a first end panel disposed on one side of the rotor core in the first direction, which prevents the magnet inserted into the magnet insertion hole from falling out from one side of the first direction and is composed of a non-magnetic material; and a second end panel disposed on the other side of the rotor core in the first direction, which prevents the magnet inserted into the magnet insertion hole from falling out from the other side of the first direction and is composed of the non-magnetic material; the thickness of the second end panel in the first direction is thinner than the thickness of the first end panel in the first direction.

[0007] According to the rotor of the motor of the present invention, the thickness of the second end panel in the first direction is thinner than the thickness of the first end panel in the first direction. Therefore, compared with the case where the thickness of the first end panel and the thickness of the second end panel in the first direction are the same, the axial length of the rotor can be reduced (shortened). Furthermore, since the thickness of the second end panel in the first direction is relatively thin, the weight of the rotor is reduced, and the moment of inertia of the rotor can be reduced.

[0008] Another motor of the present invention comprises: a rotating shaft extending in a first direction; a rotor core supported by the rotating shaft and composed of a plurality of electromagnetic steel plates stacked in the first direction; a magnet insertion hole formed in the rotor core and extending in the first direction; a magnet inserted into the magnet insertion hole; an end plate disposed on one side of the rotor core in the first direction, preventing the magnet inserted into the magnet insertion hole from falling off from one side of the first direction, and composed of a non-magnetic material; the electromagnetic steel plates include: a plurality of first electromagnetic steel plates stacked equally in the first direction; and a second electromagnetic steel plate disposed on the other side of the first electromagnetic steel plate located on the other side of the first direction among the plurality of first electromagnetic steel plates, and preventing the magnet inserted into the magnet insertion hole from falling off from the other side of the first direction.

[0009] According to the rotor of another motor of the present invention, the end panel and the second electromagnet plate prevent the magnet inserted into the magnet insertion hole from falling out of the magnet insertion hole. Thus, in the rotor of the other motor, since the end panel is not provided on the other side of the rotor core in the first direction, the axial length of the rotor can be reduced (shortened). Furthermore, since the end panel can also be omitted on the other side of the rotor core in the first direction, the weight of the rotor can be reduced by the amount of the end panel, and the moment of inertia of the rotor can be reduced. [Effects of the Invention]

[0010] According to the present invention, a motor rotor that can reduce the axial length, weight and moment of inertia of the rotor can be provided. Simple Explanation of the Diagram

[0011] Figure 1 is a cross-sectional view of the rotor of a motor in one embodiment. Figure 2 is a top view of an embodiment of an electromagnetic steel sheet. Figure 3 is a top view of the first end panel of one embodiment. Figure 4 is a cross-sectional view of the rotor of a motor in another embodiment. Figure 5 is a top view of the second electromagnetic steel plate in another embodiment. Figure 6 is a top view of the second electromagnetic steel plate in the variation example. Figure 7 is a top view of the second electromagnetic steel plate in another variation. Implementation

[0012] Hereinafter, embodiments of the rotor of the motor of the present invention will be described with reference to the drawings. It should be noted that the embodiments described herein are not intended to specifically limit the present invention. Furthermore, components and parts that perform the same function will be labeled with the same symbols, and repeated descriptions will be omitted or simplified as appropriate.

[0013] <First Implementation Form> Figure 1 is a cross-sectional view of the rotor 10 of the motor according to the first embodiment. The motor (not shown) includes the rotor 10 and a stator (not shown) that houses the rotor. As shown in Figure 1, the rotor 10 includes a rotating shaft 20, a rotor core 30, a magnet insertion hole 40, a magnet 50, a first end panel 60, a second end panel 70, a first bearing 80, and a second bearing 90.

[0014] As shown in Figure 1, the rotation shaft 20 extends in the vertical direction Z. The vertical direction Z is one example of the first direction. However, the direction in which the rotation shaft 20 extends is not limited to the vertical direction Z. A portion of the rotation shaft 20 protrudes upward from the stator (not shown). Other components are mounted on the upper end 20A of the rotation shaft 20.

[0015] As shown in Figure 1, the rotor core 30 is an annular component centered on the axis 20C of the rotating shaft 20. The rotor core 30 is supported on the rotating shaft 20. The rotor core 30 is composed of a plurality of electromagnetic steel plates 35 stacked in the vertical direction Z. A rotating shaft insertion hole 38 and a magnet insertion hole 40 are formed in the rotor core 30. The rotating shaft insertion hole 38 is for inserting the rotating shaft 20. The magnet insertion hole 40 is for inserting a magnet 50. The rotating shaft insertion hole 38 and the magnet insertion hole 40 extend in the vertical direction Z.

[0016] As shown in Figure 1, the thickness T1 of the electromagnetic steel plate 35 in the vertical direction Z is, for example, 0.15 mm to 0.5 mm. The electromagnetic steel plate 35 is processed into a specified shape by punching using a pressing die. As shown in Figure 2, the electromagnetic steel plate 35 is formed into a ring shape. The electromagnetic steel plate 35 has a rotating shaft insertion hole 38 and a plurality of magnet insertion holes 40. The magnet insertion holes 40 are located radially outside the rotating shaft insertion hole 38. The rotating shaft insertion hole 38 is formed into a generally circular shape. The magnet insertion holes 40 are formed into a generally L-shaped shape. Two magnets 50 are inserted into one magnet insertion hole 40. The magnet insertion hole 40 has a first portion 40A for inserting one magnet 50 and a second portion 40B for inserting another magnet 50. The first portion 40A and the second portion 40B are continuous. However, the shape of the magnet insertion hole 40 and the number of magnets 50 inserted into the magnet insertion hole 40 are not limited to the above. The electromagnetic steel plate 35 has a plurality of circular first through holes 44 and a plurality of generally trapezoidal second through holes 45. The stacked electromagnetic steel plates 35 are fixed to each other, for example, by riveting, bonding, welding, etc. The plurality of electromagnetic steel plates 35 are fixed to each other, for example, by riveting. Furthermore, Figure 2 shows a state in which only two magnets 50 are inserted into one magnet insertion hole 40.

[0017] As shown in Figure 1, magnet 50 is inserted into magnet insertion hole 40. Magnet 50 extends in the vertical direction Z. Magnet 50 is formed in a flat plate shape. Magnet 50 is, for example, a permanent magnet. Magnet 50 is, for example, a rare earth magnet. Magnet 50 is, for example, a neodymium magnet containing neodymium (Nd), iron (Fe), and boron (B).

[0018] As shown in Figure 1, the first end panel 60 is disposed above the rotor core 30. The first end panel 60 is disposed above the uppermost electromagnetic plate 35A among the plurality of electromagnetic plates 35 of the rotor core 30. The first end panel 60 is fixed to the rotating shaft 20, for example, by pressing it in. Alternatively, the first end panel 60 can be fixed to the rotating shaft 20 by pressing the rotor core 30 into the rotating shaft 20. In this case, the first end panel 60 is not pressed into the rotating shaft 20. The first end panel 60 prevents the magnet 50 inserted into the magnet insertion hole 40 from falling out from above the magnet insertion hole 40. When viewed from above, the first end panel 60 overlaps entirely with the magnet insertion hole 40. As shown in Figures 1 and 3, the first end panel 60 has a first through hole 62 formed in the vertical direction Z and an opening 65 that opens in the vertical direction Z (here, only opening upwards). The rotating shaft 20 is inserted into the first through hole 62. The opening 65 is circular when viewed from above. The opening 65 is located above the magnet insertion hole 40. A portion of the opening 65 overlaps with the magnet insertion hole 40 when viewed from above. Furthermore, the shape and number of openings 65 are not particularly limited. The diameter of the opening 65 is smaller than the diameter of the first through hole 62.

[0019] As shown in Figure 1, the second end panel 70 is disposed below the rotor core 30. The second end panel 70 is disposed below the lowest electromagnetic plate 35B among the plurality of electromagnetic plates 35 of the rotor core 30. The second end panel 70 is fixed to the rotating shaft 20, for example, by pressing. The second end panel 70 prevents the magnet 50 inserted into the magnet insertion hole 40 from falling out from below the magnet insertion hole 40. When viewed from above, the second end panel 70 completely overlaps with the magnet insertion hole 40. The second end panel 70 has a second through hole 72 formed in the vertical direction Z. Alternatively, the second end panel 70 may not have an opening in the vertical direction Z (e.g., only opening downwards), but it may also have such an opening. When the second end panel 70 has an opening, if the opening 65 of the first end panel 60 is designated as the first opening, and the opening of the second end panel 70 is designated as the second opening, then the volume of the first opening is greater than the volume of the second opening. When a plurality of first openings and second openings are provided, the total volume of the plurality of first openings is greater than the total volume of the plurality of second openings. Furthermore, the first opening may open only upwards, but may also open only downwards. The second opening may open only downwards, but may also open only upwards. Additionally, the first and second openings may also be through holes formed in the vertical Z-direction.

[0020] The first end panel 60 and the second end panel 70 are made of a non-magnetic material (e.g., stainless steel (e.g., SUS303)). The first end panel 60 and the second end panel 70 are formed of the same material. The first end panel 60 and the second end panel 70 are formed in a circular plate shape. The first end panel 60 and the second end panel 70 have the same shape when viewed from above. The diameter of the first end panel 60 and the second end panel 70 is smaller than the diameter of the electromagnet plate 35. The thickness TB of the second end panel 70 in the vertical direction Z is thinner than the thickness TA of the first end panel 60 in the vertical direction Z. The thickness TB of the second end panel 70 in the vertical direction Z is, for example, 0.5 mm to 1.5 mm. The thickness TA of the first end panel 60 in the vertical direction Z is, for example, 3 mm to 5 mm. The thickness TB of the second end panel 70 in the vertical direction Z is, for example, less than T5 of the thickness T5 of the five laminated electromagnet plates 35 in the vertical direction Z. The thickness TB of the second end panel 70 in the vertical Z direction is, for example, thinner than the thickness T2 of the two laminated electromagnet plates 35 in the vertical Z direction. The thickness TB of the second end panel 70 in the vertical Z direction is, for example, the same as the thickness T1 of the single electromagnet plate 35 in the vertical Z direction. The thickness TB of the second end panel 70 in the vertical Z direction may also be, for example, thicker than the thickness T1 of the single electromagnet plate 35 in the vertical Z direction. The thickness TB of the second end panel 70 in the vertical Z direction may also be, for example, the same as the thickness T2 of the two laminated electromagnet plates 35 in the vertical Z direction.

[0021] Bearing 80 and bearing 90 are rolling bearings. Bearing 80 and bearing 90 are, for example, ball bearings. Bearing 80 is the load-side bearing. Bearing 80 rotatably supports the rotating shaft 20. Bearing 90 is the unload-side bearing. Bearing 90 rotatably supports the lower end 20B of the rotating shaft 20. Bearing 80 and bearing 90 are fixed to the stator of the motor (not shown).

[0022] As described above, in the rotor 10 of the motor according to this embodiment, the thickness TB of the second end panel 70 in the vertical direction Z is thinner than the thickness TA of the first end panel 60 in the vertical direction Z. Therefore, compared with the case where the thickness TA of the first end panel 60 in the vertical direction Z and the thickness TB of the second end panel 70 in the vertical direction Z are the same, the length of the rotor 10 in the axial direction (here, the vertical direction Z) can be reduced (shortened). Furthermore, since the thickness TB of the second end panel 70 in the vertical direction Z is relatively thin, the weight of the rotor 10 can be reduced, and the moment of inertia of the rotor 10 can be reduced.

[0023] In the rotor 10 of the motor of this embodiment, the thickness TB of the second end panel 70 in the vertical direction Z is thinner than the thickness T2 of the two laminated electromagnet plates 35 in the vertical direction Z. According to the above, the axial length (here, the vertical direction Z) of the rotor 10 can be further reduced (shortened). Furthermore, since the thickness TB of the second end panel 70 in the vertical direction Z is extremely thin, the weight of the rotor 10 can be reduced, and the moment of inertia of the rotor 10 can be reduced.

[0024] In the rotor 10 of the motor in this embodiment, the thickness TB of the second end panel 70 in the vertical direction Z is the same as or greater than the thickness T1 of the electromagnetic steel plate 35 in the vertical direction Z. Based on the above, the length of the rotor 10 in the axial direction (here, the vertical direction Z) can be further reduced (shortened).

[0025] In the rotor 10 of the motor of this embodiment, the thickness TB of the second end panel 70 in the vertical direction Z is the same as the thickness T1 of the electromagnetic steel plate 35 in the vertical direction Z. According to the above, the axial length (here, the vertical direction Z) of the rotor 10 can be further reduced (shortened). Furthermore, since the thickness TB of the second end panel 70 in the vertical direction Z is extremely thin, the weight of the rotor 10 can be reduced, and the moment of inertia of the rotor 10 can be reduced.

[0026] In the rotor 10 of the motor in this embodiment, the thickness TB of the second end panel 70 in the vertical direction Z is less than or equal to the thickness T5 of the laminated five electromagnet steel plates 35 in the vertical direction Z. Based on the above, the length of the rotor 10 in the axial direction (here, the vertical direction Z) can be further reduced (shortened).

[0027] In the rotor 10 of the motor of this embodiment, the first end panel 60 has a first through hole 62 for inserting the rotating shaft 20 and extending through in the vertical direction Z, and an opening 65 that opens in the vertical direction Z. The second end panel 70 has a second through hole 72 for inserting the rotating shaft 20 and extending through in the vertical direction Z, but does not have an opening that opens in the vertical direction Z. According to the above configuration, the weight of the rotor 10 can be further reduced, and the moment of inertia of the rotor 10 can be further reduced. Furthermore, the overall weight balance of the rotor 10 can be adjusted by the shape of the opening 65 of the first end panel 60.

[0028] In the rotor 10 of the motor of this embodiment, the opening 65 of the first end panel 60 opens only upwards. The opening 65 is usually formed using a drill or the like after the first end panel 60, rotor core 30, magnet 50 and second end panel 70 are assembled onto the rotating shaft 20. Therefore, since the opening 65 of the first end panel 60 is formed to open only upwards, damage to the rotor core 30 or magnet 50 due to a drill or the like is prevented.

[0029] In the rotor 10 of the motor of this embodiment, the first end panel 60 may also have a first through hole 62 for the insertion of the rotating shaft 20 and forming a through hole in the vertical direction Z, and a first opening forming a through hole in the vertical direction Z. According to the above configuration, the weight of the rotor 10 can be further reduced, and the moment of inertia of the rotor 10 can be reduced. Furthermore, the weight balance of the entire rotor 10 can be adjusted by the shape of the first opening of the first end panel 60.

[0030] In the rotor 10 of the motor of this embodiment, the second end panel 70 may also have a second through hole 72 formed through in the vertical direction Z for the insertion of the rotating shaft 20, and a second opening formed through in the vertical direction Z. According to the above configuration, the weight of the rotor 10 can be further reduced, and the moment of inertia of the rotor 10 can be reduced. Furthermore, the overall weight balance of the rotor 10 can be adjusted by the shape of the second opening of the second end panel 70.

[0031] In the rotor 10 of the motor of this embodiment, the first end panel 60 may have a first through hole 62 for inserting the rotating shaft 20 and extending through in the vertical direction Z, and a first opening portion (e.g., opening portion 65) opening in the vertical direction Z; the second end panel 70 may have a second through hole 72 for inserting the rotating shaft 20 and extending through in the vertical direction Z, and a second opening portion opening in the vertical direction Z, wherein the volume of the first opening portion is larger than the volume of the second opening portion. According to the above configuration, the weight of the rotor 10 can be further reduced, and the moment of inertia of the rotor 10 can be reduced. Furthermore, the overall weight balance of the rotor 10 can be adjusted by the shape of the opening portion 65 of the first end panel 60.

[0032] In the rotor 10 of the motor of this embodiment, the first opening (e.g., opening 65) may open only upwards, and the second opening may open only downwards. The first and second openings are typically formed using a drill or similar tool after the first end panel 60, rotor core 30, magnet 50, and second end panel 70 are assembled onto the rotating shaft 20. Therefore, since the first opening of the first end panel 60 opens only upwards, and the second opening of the second end panel 70 opens only downwards, damage to the rotor core 30 or magnet 50 caused by a drill or similar tool is prevented.

[0033] <Second Implementation Form> Figure 4 is a cross-sectional view of the rotor 110 of the motor according to the second embodiment. The motor (not shown) includes the rotor 110 and a stator (not shown) housing the rotor 110. As shown in Figure 4, the rotor 110 includes a rotating shaft 20, a rotor core 130, a magnet insertion hole 40, a magnet 50, a first end panel 60, a first bearing 80, and a second bearing 90. The rotor 110 does not have a second end panel 70 (see Figure 1).

[0034] As shown in Figure 4, the rotor core 130 is an annular component centered on the axis 20C of the rotating shaft 20. The rotor core 130 is supported by the rotating shaft 20. The rotor core 130 is composed of a plurality of electromagnet plates 135 stacked in the vertical direction Z. A rotating shaft insertion hole 38 and a magnet insertion hole 40 are formed in the rotor core 130. The electromagnet plates 135 include a plurality of first electromagnet plates 135A and second electromagnet plates 135B stacked in the vertical direction Z. The first electromagnet plates 135A and the electromagnet plates 35 in the first embodiment have the same structure.

[0035] As shown in Figure 4, the second electromagnetic steel plate 135B is disposed below the lowest first electromagnetic steel plate 135AB among a plurality of stacked first electromagnetic steel plates 135A. The second electromagnetic steel plate 135B is fixed to the first electromagnetic steel plate 135AB, for example, by riveting, bonding, welding, etc. The second electromagnetic steel plate 135B and the first electromagnetic steel plate 135AB are fixed to each other, for example, by riveting. The thickness T3 of the second electromagnetic steel plate 135B in the vertical direction Z is, for example, 0.15 mm to 0.5 mm. The thickness T3 of the second electromagnetic steel plate 135B is the same as the thickness T1 of the first electromagnetic steel plate 135A. The second electromagnetic steel plate 135B is processed into a specified shape by punching using a pressing die. As shown in Figure 5, the second electromagnetic steel plate 135B is formed into a ring shape. The second electromagnetic steel plate 135B has a rotating shaft insertion hole 38. The second electromagnetic steel plate 135B has a plurality of circular first through holes 44 and a plurality of generally trapezoidal second through holes 45. The second electromagnetic steel plate 135B does not have magnet insertion holes 40 (see Figure 2). The second electromagnetic steel plate 135B prevents magnets 50 inserted into the magnet insertion holes 40 from falling out from below the magnet insertion holes 40. The second electromagnetic steel plate 135B has a falling-out suppression part 140. When viewed from above (Z), the falling-out suppression part 140 overlaps with the magnet insertion holes 40. When viewed from above, the falling-out suppression part 140 completely overlaps with the magnet insertion holes 40. Except for having the falling-out suppression part 140, the second electromagnetic steel plate 135B has substantially the same structure as the first electromagnetic steel plate 135A.

[0036] As described above, in the rotor 110 of the motor according to this embodiment, the first end panel 60 and the second electromagnet plate 135B prevent the magnet 50 inserted into the magnet insertion hole 40 from falling out of the magnet insertion hole 40. Thus, in the motor rotor 110, since no end panel is provided below the rotor core 130, the axial length (here, the vertical Z direction) of the rotor 110 can be reduced (shortened). Furthermore, since the end panel can also be omitted from below the rotor core 130, the weight of the rotor 110 can be reduced by the amount of the end panel, and the moment of inertia of the rotor 110 can be reduced.

[0037] In the rotor 110 of the motor in this embodiment, the second electromagnet plate 135B, when viewed from the vertical direction Z, has a detachment suppression part 140 that overlaps with the magnet insertion hole 40. According to the above description, the detachment suppression part 140 can reliably suppress the magnet 50 inserted into the magnet insertion hole 40 from falling off from below.

[0038] In the rotor 110 of the motor in this embodiment, the detachment suppression part 140 overlaps entirely with the magnet insertion hole 40 when viewed from the top-bottom direction Z. According to the above description, the detachment suppression part 140 can more reliably suppress the magnet 50 inserted into the magnet insertion hole 40 from falling off from below.

[0039] As shown in Figure 6, the second electromagnetic steel plate 135 can also replace the second electromagnetic steel plate 135B (see Figure 5) to form a second electromagnetic steel plate 135C. The second electromagnetic steel plate 135C has a plurality of through holes 255. The through holes 255 have a generally similar relationship to the magnet insertion hole 40. The through holes 255 are smaller than the magnet insertion hole 40. The second electromagnetic steel plate 135C has a detachment suppression portion 240. When viewed from the top Z direction (i.e., from above), the detachment suppression portion 240 overlaps with a portion of the magnet insertion hole 40. The detachment suppression portion 240 is a portion that divides the through holes 255. With the detachment suppression portion 240, the magnet 50 inserted into the magnet insertion hole 40 cannot pass through the through holes 255. That is, the detachment suppression portion 240 is a portion of the second electromagnetic steel plate 135C along at least a portion of the periphery of the through holes 255.

[0040] As shown in Figure 7, the second electromagnetic steel plate 135 can also replace the second electromagnetic steel plate 135B (see Figure 5) to have a second electromagnetic steel plate 135D. The second electromagnetic steel plate 135D has a plurality of through holes 355. The second electromagnetic steel plate 135D has a detachment suppression part 340. When viewed from the vertical direction Z (i.e., from above), the detachment suppression part 340 partially overlaps with a portion of the magnet insertion hole 40. The detachment suppression part 340 is a protrusion that protrudes toward the through hole 355. With the detachment suppression part 340, the magnet 50 inserted into the magnet insertion hole 40 cannot pass through the through hole 355. In this variation, when the detachment suppression part 340 is not provided, the magnet 50 is formed to a size that prevents it from passing through the through hole 355.

[0041] The preferred embodiments of the present invention have been described above. However, the above embodiments are merely illustrative, and the present invention can be implemented in various other forms.

[0042] In the first embodiment described above, the thickness TB of the second end panel 70 in the vertical direction Z is thinner than the thickness TA of the first end panel 60 in the vertical direction Z, but this is not a limitation. For example, the thickness TA of the first end panel 60 in the vertical direction Z may also be thinner than the thickness TB of the second end panel 70 in the vertical direction Z.

[0043] In the second embodiment described above, the rotor 110 has a first end panel 60, but it may also have a second end panel 70 instead of the first end panel 60. In this case, the second electromagnetic steel plate 135B is disposed above the uppermost first electromagnetic steel plate 135A among the plurality of stacked first electromagnetic steel plates 135A.

[0044] In each of the above embodiments, an opening 65 is formed in the first end panel 60, but the first end panel 60 may also not have an opening 65. Furthermore, if the first end panel 60 does not have an opening 65, an opening may be formed in the second end panel 70.

[0045] 10: Rotor 20: Rotation axis 20A: Upper end 20B: Lower end 20C: Axis 30: Rotor core 35: Electromagnetic steel sheet 35A: Electromagnetic steel sheet 35B: Electromagnetic steel sheet 38: Rotary shaft insertion hole 40: Magnet insertion hole 40A: Part 1 40B: Part 2 44: First through hole 45: Second through hole 50: Magnet 60: First end panel 62: First through hole 65: Opening 70: Second end panel 72: Second through hole 80: Bearing No. 1 90: Second bearing 110: Rotor 130: Rotor core 135: Electromagnetic steel sheet 135A: First Electromagnetic Steel Plate 135AB: First Electromagnetic Steel Plate 135B, 135C, 135D: Second Electromagnetic Steel Sheet 140: Shedding Inhibition Section 240: Shedding Inhibition Section 255: Through hole 340: Shedding Inhibition Section 355: Through hole T1, T2, T3, T5, TA, TB: Thickness Z: Up / Down direction

Claims

1. A rotor for a motor, comprising: a rotating shaft extending in a first direction; a rotor core supported by the rotating shaft and composed of a plurality of electromagnetic steel plates laminated in the first direction; a magnet insertion hole formed in the rotor core and extending in the first direction; a magnet inserted into the magnet insertion hole; and an end plate disposed on one side of the rotor core in the first direction, for preventing the magnet inserted into the magnet insertion hole from falling out from the first direction side, and composed of a non-magnetic material; the electromagnetic steel plates comprising: A plurality of first electromagnetic plates are stacked equally in the first direction; and a second electromagnetic plate is disposed on the other side of the first electromagnetic plate located on the other side of the first electromagnetic plate in the first direction, and suppresses the magnet inserted into the magnet insertion hole from falling off from the other side of the first direction; and the second electromagnetic plate, when viewed from the first direction, has a through hole that partially overlaps with the magnet insertion hole; and a falling-off suppressing portion that overlaps with other portions of the magnet insertion hole; the falling-off suppressing portion is a portion of the second electromagnetic plate along at least a portion of the periphery of the through hole.

2. The rotor of the motor as claimed in claim 1, wherein the aforementioned detachment suppression part is a protrusion protruding toward the aforementioned through hole.

3. The rotor of the motor as claimed in claim 1, wherein the second electromagnet plate has a plurality of the aforementioned through holes; the through holes are smaller than the magnet insertion holes when viewed from the aforementioned first direction; the aforementioned detachment suppression part is configured to suppress the magnet inserted into the aforementioned magnet insertion holes from passing through the aforementioned through holes.

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