Motor iron core

Abstract

The invention relates to a motor core. A motor core according to the present disclosure includes: a motor core body including a plurality of grooves arranged in a ring shape at predetermined intervals; a plurality of magnets inserted into the plurality of grooves; a pressing body that supports the plurality of magnets inserted into the plurality of grooves from at least one of the ends of the plurality of grooves in the direction of the central axis of the motor core body; and pressing plates attached to both end portions of the motor core main body along the central axis, the pressing body being configured from a spring member that is annular or C-shaped in a plan view. The pressing body is provided with valley portions protruding in a direction approaching the motor core main body and mountain portions protruding in a direction away from the motor core main body, which are alternately provided along a circumference centered on the central axis of the motor core main body, and the pressing body is provided on at least one of the end portions of the motor core main body in the direction of the central axis. At least one of the valley portions is in contact with an end portion of each of the plurality of magnets.

Description

Technical Field

[0001] This disclosure relates to motor cores. Background Technology

[0002] In rotary electric machines, there are rotary electric machines in which permanent magnets are mounted on the motor core, such as the rotor core. Thus, as one method of mounting permanent magnets on the motor core, a method is known to fill the surrounding area with a resin composition and allow it to cure after inserting the permanent magnet into a slot provided in the motor core.

[0003] Japanese Patent Application Publication No. 2013-009453 describes a method in which a resin composition is filled into a slot in a rotor core and cured after the resin sheet of a specified size is heated in a container to soften / melt it.

[0004] According to the method disclosed in Japanese Patent Application Publication No. 2013-009453, magnets can be stably fixed in a tank. However, a specialized manufacturing apparatus is required to perform a series of operations to soften / melt the resin and fill it into the tank. Therefore, a motor core that can assemble magnets in the tank more simply and stably than this method is needed. Summary of the Invention

[0005] This disclosure provides a motor core in which a magnet can be supported in a slot with a simple configuration.

[0006] The first embodiment of this disclosure comprises a motor core including: a motor core body including a plurality of slots arranged in an annular shape at predetermined intervals; a plurality of magnets inserted into the plurality of slots; a pressing body supporting the plurality of magnets inserted into the plurality of slots from at least one of the ends of the plurality of slots along the central axis of the motor core body; and a pressing plate assembled at both ends of the motor core body along the central axis. The pressing body is composed of a spring member that is annular or C-shaped when viewed from above, wherein valleys rising towards the motor core body and ridges rising away from the motor core body are alternately arranged along a circumference centered on the central axis of the motor core body. When the pressing body is provided at at least one of the ends of the motor core body along the central axis, at least one of the valleys abuts against the respective ends of the plurality of magnets.

[0007] In the motor core described above, magnets can be assembled in the slot with a simple configuration by using a pressing body.

[0008] Regarding the second embodiment of the motor core of this disclosure, in the motor core of the first embodiment of this disclosure described above, a receiving portion capable of accommodating the pressing body is formed on at least one of the side of the pressing plate adjacent to the motor core body or the side of the motor core body that is in contact with the pressing body.

[0009] In the motor core described above, the pressing body is not exposed to the outside, and the assembly state of the magnet is stable.

[0010] Regarding the motor core of the third embodiment of this disclosure, in the motor core of the first or second embodiment of this disclosure described above, the length of the plurality of magnets inserted into the plurality of slots along the direction of the central axis is shorter than the length of the plurality of slots along the direction of the central axis.

[0011] In the motor core described above, the magnet is housed entirely within the slot, making the assembly of the motor core easy.

[0012] With regard to the motor core of the fourth embodiment of this disclosure, in the motor core of any of the first to third embodiments of this disclosure, the pressing body includes a plurality of spring members that are adjusted to different diameters.

[0013] In the motor core described above, by providing multiple spring components, the assembly of magnets can be stably implemented regardless of the layout of the slots.

[0014] Regarding the motor core of the fifth embodiment of this disclosure, in the motor core of any of the first to fourth embodiments of this disclosure, at least one of the pressing plate and the motor core body includes a positioning part for positioning the pressing body.

[0015] In the motor core described above, it becomes easy to adjust the position of the pressing body relative to the magnet, etc.

[0016] With regard to the motor core of the sixth embodiment of this disclosure, in the motor core of any of the first to fifth embodiments of this disclosure, all the valleys abut against the plurality of magnets housed in the plurality of slots.

[0017] In the motor core described above, the magnets are assembled in a stable state.

[0018] Invention Effects

[0019] According to the motor core disclosed herein, magnets can be supported in a slot with a simple configuration. Attached Figure Description

[0020] Figure 1 This is an exploded perspective view showing an example of a motor core according to one embodiment of the present disclosure.

[0021] Figure 2 It is Figure 1 The diagram shows an enlarged view of one end of the motor core.

[0022] Figure 3 It is along Figure 2 The cross-sectional view shown is a section view of the assembled motor core cut along line A-A.

[0023] Figure 4 yes Figure 3 Enlarged view of part B.

[0024] Figure 5 This is a variation of the motor core and Figure 3 The corresponding sectional view.

[0025] Figure 6 This is another variation of the motor core and Figure 3 The corresponding sectional view.

[0026] Figure 7 This is another variation, a top view with the pressing plate of the motor core omitted. Detailed Implementation

[0027] Hereinafter, various embodiments for implementing this disclosure will be described with reference to the accompanying drawings. It should be noted that the following description schematically illustrates the scope necessary to achieve the objectives of this disclosure, primarily focusing on the scope necessary for the description of corresponding parts of this disclosure; parts omitted from the description employ known techniques. Furthermore, identical or equivalent components in the figures are labeled with the same or similar reference numerals, and repeated descriptions are omitted. Moreover, in cases where multiple identical or equivalent components are included in multiple figures, sometimes only a few are labeled with reference numerals for ease of reading.

[0028] Figure 1 This is an exploded perspective view showing an example of a motor core according to one embodiment of the present disclosure. The motor core 1 of this embodiment can be a component of a motor for magnet assembly; for example, it can be... Figure 1 The rotor core shown constitutes an internal rotor type motor.

[0029] The motor core 1 of this embodiment includes at least: a motor core body 10, including a plurality of slots 12 arranged in an annular shape at predetermined intervals; a plurality of magnets 20 inserted into the plurality of slots 12; a pressing body 30 supporting the plurality of magnets 20 inserted into the plurality of slots 12; and a pressing plate 40 assembled at both ends of the motor core body 10 along the central axis.

[0030] The motor core body 10 can be composed of a generally cylindrical magnetic body, which is an iron chip 15 (see reference) made of a relatively thin electromagnetic steel plate. Figure 3 It is constructed by stacking multiple iron plates. The number of iron plates 15 constituting the motor core body 10 is not particularly limited, but can be, for example, around 50 to 400. Furthermore, the wall thickness of the iron plates 15 can be, for example, 0.05 mm to 2.00 mm. Moreover, multiple iron plates 15 can be simply stacked together, or they can be riveted together by forming riveting portions (not shown) on each iron plate 15, or they can be joined by applying adhesive between the iron plates 15, or at least some can be welded together.

[0031] Furthermore, a through hole 11 may be provided in the axial portion of the motor core body 10 for inserting a shaft (not shown) that constitutes the rotating shaft during motor assembly. One or more supports for the aforementioned shaft may be provided inside the through hole 11. Figure 2 (Two protrusions in the middle) 11A.

[0032] Furthermore, in the motor core body 10, a plurality of (in) extending along the central axis X of the motor core body 10 in a manner surrounding the through hole 11. Figure 1 The 32 slots 12 are arranged in a ring at predetermined intervals. Each slot 12 can be a shape into which a magnet 20 can be inserted, such as a cuboid shape passing through the motor core body 10 along the central axis X, or a through hole that appears as an arc when viewed from above; however, its specific shape and arrangement are not particularly limited. Similarly, the number of slots 12 can be arbitrarily changed, and can be more or less than [number missing]. Figure 1 The 32 shown.

[0033] Regarding the slot 12 of this embodiment, an example is shown where its opening is composed of a rectangular through hole extending radially from the central axis X, and the circumferential spacing of the through holes is set to be equal. Furthermore, the slot 12 of this embodiment includes slots with different lengths in the longitudinal direction of the aforementioned rectangular openings. It should be noted that the layout of each slot 12, including its extension direction and arrangement when viewed from above, is not limited to the above layout and can be appropriately modified considering the orientation and intensity of the magnetic field generated around the magnet 20.

[0034] The magnet 20 can be made of permanent magnet and is inserted into and supported inside the slot 12 of the motor core body 10. The magnet 20 can be, for example, a cuboid slightly smaller than the slot 12 or an arc-shaped block when viewed from above. Furthermore, it doesn't matter whether the magnet 20 is magnetized at the time of insertion into the slot 12. Moreover, the magnet 20 can be divided along the central axis X or in a direction orthogonal to the direction along the central axis X. It should be noted that... Figure 1 The image shows the magnet 20 partially inserted into the slot 12.

[0035] The pressing body 30 is composed of a spring member that appears annular or C-shaped when viewed from above. In this spring member, valleys 31 protruding towards the motor core body 10 and ridges 32 protruding away from the motor core body 10 are alternately arranged along a circumference centered on the central axis X. In this embodiment, the pressing body 30 employs a substantially annular wave spring, which is formed from a strip of metal plate, extending radially from the ridges of the valleys 31 and ridges 32 centered on the central axis X. It should be noted that the layout of the valleys 31 and ridges 32 and the direction of their extension can be appropriately modified to match the arrangement and direction of the grooves 12 of the motor core body 10. Therefore, for example, this disclosure may also include cases where the valleys 31 and ridges 32 are not formed radially centered on the central axis X.

[0036] The valley portion 31 of the aforementioned pressing body 30 is preferably curved into an arc shape when viewed from the side. Thus, if the valley portion 31 is curved into an arc shape, when it comes into contact with the magnet 20, the contact point 50 can be made into a substantially surface contact. Therefore, a support structure with high wear resistance can be obtained. It should be noted that the shape of the valley portion 31 is not limited to the aforementioned arc shape; for example, it can also be a shape formed by bending when viewed from the side, or a shape having a flat surface extending along the end face 20 of the magnet 20, etc.

[0037] Figure 2 It is Figure 1 The diagram shows an enlarged view of one end of the motor core. Figure 2 In the middle, it is shown that from Figure 1 From the disassembled state shown, the magnet 20 and the pressing body 30 are positioned relative to the motor core body 10 in their assembled state. The pressing body 30 is located at least one of the ends of the motor core body 10 along the central axis X. Figure 1 As shown, in this embodiment, one pressing body 30 is provided at each of the two ends of the motor core body 10. Furthermore, as... Figure 2 As shown, in the pressing body 30 located at the end of the motor core body 10 along the central axis X, the valley portion 31 abuts against the end face 21 of each of the plurality of magnets 20. Relatedly, the layout of the valley portion 31 and its position relative to the motor core body 10 of the pressing body 30 in this embodiment have been pre-adjusted. Details regarding the support structure of the pressing body 30 for the magnets 20 will be described later.

[0038] One pressing plate 40 is provided at each of the two ends of the motor core body 10 along the central axis X direction to fix the motor core body 10 and the pressing body 30. The pressing plate 40 can be made of metals such as aluminum or iron, and is composed of a disc-shaped component having an outer diameter substantially the same as that of the motor core body 10 and having a through hole 41 formed in its central part that communicates with the through hole 11 of the motor core body 10. The pressing plate 40 can be fixed to the motor core body 10 and the pressing body 30, for example, by fixing its outer edge 44 to the motor core body 10 with adhesive or the like, or by fixing it to a shaft inserted into the through hole 11, but the specific fixing structure is not limited to these.

[0039] Furthermore, in this embodiment, it is preferable to provide a receiving recess 42 on the surface of the pressing plate 40 adjacent to the motor core body 10—in other words, on the surface opposite the end of the motor core body 10—as an example of a receiving portion capable of accommodating the pressing body 30. It should be noted that in this embodiment, the case where the receiving recess 42 is provided on the pressing plate 40 is illustrated, but alternatively, a receiving portion for accommodating at least a portion of the pressing body 30 may be provided on the surface of the motor core body 10 that contacts the pressing body 30, instead of the receiving recess 42. Furthermore, when the pressing body 30 is only disposed on one end face of the motor core body 10, it is preferable to provide the aforementioned receiving recess 42 only on one of the two pressing plates 40, and to make the surface of the other pressing plate 40 opposite the motor core body 10 substantially flat, so as to block one opening of the slot 12.

[0040] Furthermore, it is preferable to provide a positioning part for positioning the pressing body 30 on at least one of the pressing plate 40 or the motor core body 10. In this embodiment, such as Figure 1 As shown, an example is a positioning groove 43 provided as a positioning part at one or more locations on the side wall surface of the receiving recess 42. Figure 1 (There are two parts in the middle). The positioning groove 43 accommodates a positioning protrusion 33 that is provided on the outer periphery of the pressing body 30 during assembly. When the positioning protrusion 33 is accommodated in the positioning groove 43, positioning of the pressing body 30 relative to the pressing plate 40, especially in the direction of rotation about the central axis X, is possible. Then, by providing the positioning groove 43, positioning of the valley part 31 and the magnet 20 becomes easier.

[0041] It should be noted that the configuration of the positioning part is not limited to the above-described configuration. As long as it can position the pressing body 30, it can be appropriately modified. In addition, its configuration, shape, or quantity can also be appropriately adjusted. Specifically, for example, the following configuration can be used: the shape of the receiving recess formed on the pressing plate 40 is made to match the shape of the pressing body 30 to form an annular shape, one or more positioning grooves are formed on the inner and / or outer peripheral walls of the annular receiving recess, and positioning protrusions are provided at corresponding positions on the inner and / or outer peripheral sides of the pressing body 30.

[0042] By employing the above-described configuration, particularly the configuration associated with the pressing body 30, the motor core 1 of this embodiment can support the magnet 20 within the groove 12 of the motor core body 10 without resorting to resin molding as exemplified in the conventional art. The support structure will be further described in detail below.

[0043] Figure 3 It is along Figure 2 The image shows a cross-sectional view of the assembled motor core cut along line A-A. When assembling motor core 1, as shown... Figure 3 As shown, the pressing body 30 is accommodated within the receiving recess 42, held between the motor core body 10 and the pressing plate 40. At this time, the arrangement and size of the valleys 31 formed on the pressing body 30 are pre-adjusted to match the arrangement of the slots 12, and the position of the pressing body 30 relative to the motor core body 10 is adjusted by the positioning slots 43 and positioning protrusions 33. Specifically, in this embodiment, an example is shown where the number of valleys 31 is the same as the number of slots 12, and their positions are adjusted such that all valleys 31 abut against any one of the plurality of magnets 20.

[0044] Through the above adjustments, in the assembled motor core 1, as follows: Figure 3 As shown, the valleys 31 of the pressing body 30 abut one by one against the end face 21 of the magnet 20 along the central axis X. At this time, a portion of the valley 31 of the pressing body 30 enters the interior of the groove 12. Furthermore, the ridges 32 formed between adjacent valleys 31 abut against the bottom surface of the receiving recess 42 of the pressing plate 40. Thus, even when external forces such as motor rotation are applied to the pressing body 30, the valleys 31 will not separate from the end face 21, and the magnet 20 can be stably supported.

[0045] Figure 4 yes Figure 3 Enlarged view of part B. (See image below.) Figure 4As shown, the valley 31 that abuts against the end face 21 of the magnet 20 is curved into an arc shape. Furthermore, the end face 21 of the magnet 20 is substantially composed of a flat surface. Therefore, the contact point 50 between the end face 21 and the valley 31 becomes a surface contact due to the slight flattening of the surface of the valley 31. In this way, when the contact point 50 is a surface contact, by ensuring a relatively large contact area, localized wear on the valley 31 or the magnet 20 can be reduced. It should be noted that in this embodiment, an example is shown where the end face 21 is substantially composed of a flat surface, but unevenness can also be formed on the end face 21.

[0046] Furthermore, it is preferable if the length of the magnet 20 along the central axis X is the same as that of the motor core body 10, or in other words, the length of the slot 12 along the central axis X, so that the magnet 20 is less likely to move within the slot 12. However, sometimes, due to factors such as slight deviations in the wall thickness of the iron chip 15, it is difficult to make the two lengths consistent. Due to such deviations, for example, if the length of the magnet 20 along the central axis X is longer than that of the motor core body 10 along the central axis X, the magnet 20 will protrude from the opening of the slot 12, and in some cases, fixing it by the pressing plate 40 will become difficult.

[0047] Therefore, in this embodiment, the length of the magnet 20 along the central axis X is set to be shorter than the length of the motor core body 10 along the central axis X. If this is set, the position of the end face 21 of the magnet 20, when it is housed in the groove 12, will be located at a length G (e.g., less than the wall thickness of one iron chip 15) inward from the end face position of the motor core body 10 into the groove 12. However, as described above, a portion of the valley 31 of the pressing body 30 in this embodiment contacts the end face 21 of the magnet 20 in a manner that extends into the groove 12. Therefore, even if the length of the magnet 20 along the central axis X is shorter than the length of the motor core body 10 along the central axis X, a contact point 50 can be stably formed. Furthermore, by constructing the pressing body 30 with a ring-shaped or C-shaped spring member, multiple magnets 20 can be supported by one spring member 1. Compared to pressing the magnets 20 individually with pressing members, the number of components can be reduced, thereby facilitating the assembly of the motor core 1.

[0048] As explained above, according to this embodiment, the motor core 1 can be assembled with magnets 20 into the motor core body 10 with a simple configuration by using the pressing body 30.

[0049] Hereinafter, several variations of the motor core 1 of the present embodiment will be described.

[0050] In the above-described embodiment, the case where the grooves 12 are formed at equal intervals in the circumferential direction is illustrated by an example where the interval D between adjacent valleys 31 of the pressing body 30 is the same, but this interval D can also be different. Hereinafter, a variation where the interval between valleys 31 is not fixed will be described. It should be noted that in... Figure 5 In the modified motor core 1A shown, the same reference numerals are used for the same constituent elements as those in the motor core 1 of the above embodiment, and their descriptions are omitted. Only the points that are different from those in the motor core 1 of the above embodiment are described.

[0051] Figure 5 It is a modified example of a motor core. Figure 3 The corresponding sectional view. For example... Figure 5 As shown, in the case of the motor core 1A of this modified example, the radial spacing of the multiple slots 12A of the motor core body 10A, which is composed of multiple iron chips 15A, is not equal. Therefore, the spacing between the valleys 31A of the pressing body 30A of the motor core 1A of this modified example is also adjusted to match the position of the slots 12. Specifically, the gap D1 between the valleys 31A corresponding to the shorter distance between the slots 12A is adjusted to be shorter than the gap D2 between the valleys 31A corresponding to the longer distance between the slots 12A. In this way, by adjusting the arrangement of the valleys 31A of the pressing body 30, the assembly of the magnet 20 can be reliably performed.

[0052] Furthermore, in the above-described embodiment, an example was shown where all valleys 31 abut against any one of the end faces 21 of the plurality of magnets 20. However, it is not necessary for all valleys 31 to abut against the end faces 21 of the plurality of magnets 20. Hereinafter, another variation of an embodiment in which some valleys do not abut against the plurality of magnets 20 will be described, referring to... Figure 6 This will be explained below. It should be noted that, in cases such as... Figure 6 In another variation of the motor core 1B shown, the same reference numerals are used for the same constituent elements as those in the motor core 1 of the above embodiment, and their descriptions are omitted. Only the points that are different from those in the motor core 1 of the first embodiment are described.

[0053] Figure 6 This is another variation of the motor core and Figure 3 The corresponding sectional view. For example... Figure 6As shown, in the motor core 1B of this modified example, the radial spacing of the plurality of slots 12B in the motor core body 10B, which is composed of a plurality of iron chips 15B, is larger than the spacing in the present embodiment described above. Furthermore, the pressing body 30B of the motor core 1B of this modified example includes a valley portion 31B that abuts against the end face 21 of the magnet 20 and a valley portion 31C that does not abut against the end face 21 of the magnet 20. The valley portion 31C that does not abut against the end face 21 of the magnet 20 abuts against the end face 10A of the motor core body 10A, but through this abutment, the valley portion 31C is pressed towards the mountain portion 32, thereby achieving the effect of pressing the valley portion 31B that abuts against the end face 21 of the magnet 20 against the end face 21 of the magnet 20. Therefore, the end face 21 of the magnet 20 can be made to abut against the valley portion 31B more reliably.

[0054] Furthermore, in one embodiment described above, the pressing body 30 is exemplified by including one spring member, but it may also include two or more spring members. Hereinafter, for another variation of one embodiment in which the pressing body is composed of two spring members, refer to... Figure 7 This will be explained below. It should be noted that... Figure 7 In another variation of the motor core 1C shown, the same reference numerals are used for the same constituent elements as those in the motor core 1 of the above embodiment, and their descriptions are omitted. Only the points that are different from those in the motor core 1 of the above embodiment are described.

[0055] Figure 7 This is another variation, a top view omitting the pressing plate of the motor core. Regarding the motor core 1C in this variation, as... Figure 7 As shown, the slot 12C formed in the motor core body 10C is configured to be inclined at a predetermined angle relative to the radial direction based on the central axis X of the motor core body 10. Furthermore, as... Figure 7 As shown, in this modified example, the first pressing body 30C, which is arranged to traverse the outer portion of the groove 12C, and the second pressing body 30C, which is arranged to traverse the inner portion of the groove 12C, are coaxially arranged. The first pressing body 30C and the second pressing body 30D have different diameters, with the first pressing body 30C having a larger diameter than the second pressing body 30D. The first pressing body 30C and the second pressing body 30D can be constructed from the same spring member as the pressing body 30 described in one embodiment, and their valley and mountain configurations, as well as the extension direction of their ridges, are also the same as those of the pressing body 30 in one embodiment, and can be adjusted to match the configuration of the magnet 20. According to the motor core 1C of this modified example, multiple pressing bodies 30C and 30D can be used to press and support the magnet 20 at multiple locations, thereby making the assembly state of the magnet 20 more stable.

[0056] This disclosure is not limited to the embodiments described above, and various modifications and implementations can be made without departing from the spirit of this disclosure. All of these modifications are encompassed within the technical concept of this disclosure. Furthermore, in this disclosure, each constituent element may exist as one or more, provided there is no contradiction.

Claims

1. A motor core, comprising: The motor core body includes multiple slots arranged in annular shape at predetermined intervals; Multiple magnets are inserted into the multiple slots; The pressing body supports the plurality of magnets inserted into the plurality of slots from at least one of the ends of the plurality of slots along the central axis of the motor core body; as well as The pressing plates are assembled at both ends of the motor core body along the central axis. The pressing body is composed of a spring member that appears ring-shaped or C-shaped when viewed from above. In this spring member, valleys that bulge towards the motor core body and ridges that bulge away from the motor core body are alternately arranged along a circumference centered on the central axis of the motor core body. When the pressing body is located at at least one of the ends of the motor core body along the central axis, at least one of the valleys abuts against the respective ends of the plurality of magnets.

2. The motor core according to claim 1, wherein, A receiving portion capable of accommodating the pressing body is formed on at least one of the face of the pressing plate adjacent to the motor core body or on the face of the motor core body that is in contact with the pressing body.

3. The motor core according to claim 1, wherein, The length of the plurality of magnets inserted into the plurality of slots along the central axis is shorter than the length of the plurality of slots along the central axis.

4. The motor core according to claim 1, wherein, The pressing body includes a plurality of spring members that are adjusted to different diameters.

5. The motor core according to claim 1, wherein, At least one of the pressing plate and the motor core body has a positioning part for positioning the pressing body.

6. The motor core according to claim 1, wherein, All of the valleys abut against the plurality of magnets housed in the plurality of slots.

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