Rotor

Abstract

A rotor according to the present disclosure comprises: a rotor core that can rotate about an axis of rotation as the center of rotation; a plurality of magnets provided for the rotor core; a pair of end plates provided on both end faces in the axial direction of the rotor core, each end plate having a first surface positioned on the side of the rotor core and a second surface positioned on the side opposite the first surface; and a resin part comprising a first resin part covering at least the outer circumferential edge of the second surface of one end plate, a second resin part covering at least the outer circumferential edge of the second surface of the other end plate, and a third resin part connecting the first resin part and the second resin part on the outside of the rotor core.A resin inlet, into which the resin part enters, is provided on the second surface of at least one of the pair of end plates.

Description

TECHNICAL AREA

[0001] The present disclosure relates to a rotor contained in an electric motor and the like. TECHNICAL BACKGROUND

[0002] A conventional electric motor rotor comprises: a rotor core mounted on a shaft so that it rotates integrally with the shaft; a plurality of permanent magnets embedded in the rotor core; and a pair of plate-shaped end plates positioned at opposite ends of the rotor core along its axial direction. In some cases, the rotor core and the pair of end plates are molded from resin to increase the rotor's strength and ensure sufficient clearance between the rotor's permanent magnets and components that might be affected by the magnetic fields of the permanent magnets.

[0003] The rotor of the electric motor contains a resin component formed from a molded resin. This resin component includes: a first resin section covering a surface of one of the pair of end plates; a second resin section covering a surface of the other end plate; and third resin sections connecting the first and second resin sections on the outside of the rotor core. List of references Patent document

[0004] Patent document 1: Unexamined Japanese patent application, publication no. 2008-199725 DISCLOSURE OF THE INVENTION Problems to be solved by the invention

[0005] The first resin section must be thick enough to ensure sufficient distance between the permanent magnets and the links affected by them. However, a sufficiently thick first resin section is quite heavy. Due to its weight, the first resin section can damage the third resin sections as a result of centrifugal force acting on it during high-speed rotation of the electric motor, and may eventually detach from the end plate. As with the first resin section, the second resin section can also detach from the end plate.

[0006] One possible approach to preventing damage to the third resin section is to use a resin with sufficient strength. However, if the electric motor rotates at high speed and reaches a high temperature, even a resin section with sufficient strength can still develop cracks due to the difference between the coefficient of thermal expansion of the electric motor's iron components and the coefficient of thermal expansion of the resin section.

[0007] To solve the problems mentioned above, the aim is to provide a rotor that includes a resin part formed from a molding resin and is less susceptible to damage during rotation of the rotor. Means to solve the problems

[0008] A rotor according to the present disclosure comprises: a rotor core rotatable about a rotating shaft serving as the center of rotation; a plurality of magnets provided in the rotor core; a pair of end plates provided at opposite ends of the rotor core in an axial direction of the rotor core, each of the pair of end plates having a first surface located in the direction of the rotor core and a second surface located opposite the first surface; and a resin part comprising a first resin section covering at least an outer circumferential region of the second surface of one of the end plates, a second resin section covering at least an outer circumferential region of the second surface of the other end plate, and third resin sections connecting the first resin section and the second resin section on the outside of the rotor core.The second surface of at least one of the end plates has one or more resin inlet sections that are filled with the resin. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic perspective view of a rotor according to a first embodiment of the present invention; Fig. Figure 2 is a schematic longitudinal cross-sectional view of the rotor according to the first embodiment of the present invention, wherein one section is omitted; Fig. Figure 3 is a schematic perspective view of a resin part of the rotor according to the first embodiment of the present invention; Fig. Figure 4 is a schematic perspective view showing a partially enlarged view of the rotor according to the first embodiment of the present invention, wherein a section thereof is shown in section and the resin part is omitted; Fig. Figure 5 is a schematic perspective view showing a partially enlarged view of the rotor according to the first embodiment of the present invention, with a section thereof shown in cross-section; Fig. Figure 6 is a schematic transverse cross-sectional view showing a partially enlarged view of the rotor according to the first embodiment of the present invention; Fig. Figure 7 is an explanatory diagram showing an example in which screws are positioned further inwards in the radial direction of a rotor core than in the first embodiment of the present invention; Fig. Figure 8 is an explanatory diagram showing an example where the screws are positioned further inwards in the radial direction of the rotor core than in a diagram showing the screw positions in the radial direction of the rotor core. Fig. 7 configurations shown; Fig. Figure 9 is a schematic perspective view showing a partially enlarged view of a rotor according to a second embodiment of the present invention, wherein a section thereof is shown in section and a resin part is omitted; Fig. Figure 10 is a schematic perspective view showing a partially enlarged view of the rotor according to the second embodiment of the present invention, with a section thereof shown in cross-section; Fig. Figure 11 is a schematic longitudinal cross-sectional view of the rotor according to the second embodiment of the present invention, wherein one section is omitted; Fig. Figure 12 is a schematic perspective view showing a partially enlarged view of a rotor according to modification example 1 of the present invention, wherein a section thereof is shown in section and a resin part is omitted; Fig. Figure 13 is a schematic perspective view showing a partially enlarged view of a rotor according to modification example 2 of the present invention, wherein a section thereof is shown in section and a resin part is omitted; and Fig. Figure 14 is a schematic perspective view showing a partially enlarged view of a rotor according to modification example 3 of the present invention, wherein a section of it is shown in section and a resin part is omitted. PREFERRED OPERATING MODE FOR REALIZING THE INVENTION

[0009] The following describes a rotor according to one aspect of the present disclosure with reference to the drawings. With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. Section 5 describes a rotor 1 according to a first embodiment. The rotor 1 is used with a stator (not shown) in an electric motor that drives a rotating device. The rotor 1 includes a rotor core 2, a plurality of magnets 3, a pair of end plates 4 and 5, a mounting element 6, and a resin part 7. It should be noted that the rotor 1 is not limited to use in an electric motor and can, for example, be used in a generator.

[0010] The rotor core 2 has a hollow cylindrical shape, open at opposite ends in an axial direction J1, and is formed from a magnetic material. Typically, the rotor core 2 is a structure comprising a plurality of electromagnetic steel sheets, which are not shown. These multiple electromagnetic steel sheets are stacked on top of each other in the axial direction J1. In the first embodiment, the rotor core 2 has an annular section 8 and a plurality of projecting sections 9. The annular section 8 has a hollow cylindrical shape extending in the axial direction J1 and is open at opposite ends in the axial direction J1. The plurality of projecting sections 9 are provided on the annular section 8 and project outwards in a radial direction K1.Each of the projecting sections 9 has a plate-like shape along the axial direction J1 of the circular segment 8 and projects outwards from the outer circumferential surface of the circular segment 8 in the radial direction K1. The majority of projecting sections 9 are spaced apart along the circumferential direction of the circular segment 8 and arranged side by side. The adjacent projecting sections 9 have grooves 10 between them, which are open outwards in the radial direction K1 of the circular segment 8. Opposite ends of each groove 10 in the axial direction J1 are open towards the outside of the rotor core 2. As in . Fig. As shown in Figure 2, each of the projecting sections 9 has a plurality of circular through-holes 11 extending through it in the axial direction J1. The plurality of through-holes 11 are arranged side by side in the circumferential direction of the rotor core 2.

[0011] The rotor core 2 is rotatable about a rotating shaft 28, which serves as the center of rotation. The rotating shaft 28 has a solid cylindrical shape extending in the axial direction J1. The rotating shaft 28 is provided in a housing of an electric motor (not shown) and is rotatably mounted via a bearing (not shown). The rotating shaft 28 is rotatable about its own axis. The rotating shaft 28 is integrated with the rotor core 2. Specifically, the rotor core 2, with the rotating shaft 28 passing through an inner hole 12 therein, is fixed to the rotating shaft 28 in such a way that it is integrally rotatable with the rotating shaft 28.

[0012] Each of the magnets 3 has a substantially rectangular plate shape. The majority of magnets 3 are provided in the slots 10 formed in the rotor core 2. Specifically, each magnet 3 is provided in the corresponding slot 10, with one plate surface of the magnet 3 facing a side surface of the slot 10 and an opposite plate surface of the magnet 3 facing an opposite side surface of the slot 10. In other words, each magnet 3 positioned in the corresponding slot 10 extends in the axial direction J1 and in the radial direction K1 of the rotor core 2. Each magnet 3 positioned in the corresponding slot 10 is in contact with the bottom surface of the slot 10. Thus, the majority of magnets 3 are provided in a radial pattern in the rotor core 2.

[0013] The length of the magnets 3 in the axial direction J1 is approximately the same as the length of the slots 10 in the axial direction J1. Therefore, each magnet 3 positioned in the corresponding slot 10 does not protrude from the opposite ends of the slot 10 in the axial direction J1. The magnets 3 are free of the slots 10 in the axial direction J1. The length of the magnets 3 in the radial direction K1 of the rotor core 2 is shorter than the depth of the slots 10. The rotor core 2 with the magnets 3 positioned in the slots 10 therefore has slot-shaped recessed sections 13 extending in the axial direction J1. Opposite surfaces of each pair of adjacent protruding sections 9 serve as side surfaces of a corresponding recessed section 13, and an end surface of the magnet 3 positioned in the corresponding slot 10 serves as the bottom surface of the recessed section 13.The recessed sections 13 are open in the radial direction K1 towards the outside of the rotor core 2. The majority of magnets 3 are provided in the rotor core 2 as described above.

[0014] The pair of end plates 4 and 5 are provided at opposite ends of the rotor core 2 in the axial direction J1. Each of the pair of end plates 4 and 5 has a first surface 14 facing the rotor core 2 and a second surface 15 opposite the first surface 14. In the first embodiment, the pair of end plates 4 and 5 are disk-shaped. In the disk-shaped configuration, the first surface 14 refers to one of the plate surfaces of each of the disk-shaped end plates 4 and 5, and the second surface 15 refers to an opposite plate surface of each of the disk-shaped end plates 4 and 5. Each of the disk-shaped end plates 4 and 5 has a circular insertion hole 16 in its center, which extends through it in the axial direction J1. The rotating shaft 28 described above is inserted into the insertion holes 16.Each of the disc-shaped end plates 4 and 5 has a plurality of through holes 17 extending through them in the axial direction J1. The plurality of through holes 17 are arranged side by side in the circumferential direction of the end plates 4 and 5. The outer diameter of the disc-shaped end plates 4 and 5 is smaller than the outer diameter of the rotor core 2. The second surface 15 of end plate 4 and the second surface 15 of end plate 5 have a plurality of resin inlet sections 18, which are filled with the resin component 7 described below. The plurality of resin inlet sections 18 are arranged side by side in the circumferential direction of the end plates 4 and 5. In the first embodiment, the resin inlet sections 18 have a circular recess shape that extends towards the first surface 14.

[0015] The mounting element 6 has a disc shape. At its center, the mounting element 6 has a circular insertion hole 19 that extends through it in the axial direction J1. The mounting element 6 has a plurality of screw holes 20 that extend through it in the axial direction J1. The plurality of screw holes 20 are arranged side by side in the circumferential direction of the mounting element 6. The inner circumferential surface of each screw hole 20 has an internal thread. The outer diameter of the disc-shaped mounting element 6 is smaller than the outer diameter of the end plates 4 and 5.

[0016] As in Fig. Figure 2 shows the pair of end plates 4 and 5 attached to the rotor core 2 by a plurality of screws 21. Specifically, when the first surface 14 of the end plate 4 is in contact with an end surface of the rotor core 2 in the axial direction J1, and when the first surface 14 of the end plate 5 is in contact with an opposite end surface of the rotor core 2 in the axial direction J1, the screws 21 are screwed through the through holes 17 of the pair of end plates 4 and 5 and the through holes 11 of the rotor core 2 into the screw holes 20 of the mounting element 6 located on the second surface 15 of the end plate 4. Thus, the pair of end plates 4 and 5 are attached to the opposite ends of the rotor core 2 in the axial direction J1. The rotating shaft 28 with the rotor core 2, which is fixed to it, with the pair of end plates 4 and 5 attached to the rotor core 2, passes through the inner hole 12 of the rotor core 2, the insertion holes 16 of the end plates 4 and 5 and the insertion hole 19 of the mounting member 6.As described above, the outer diameter of the end plates 4 and 5 is smaller than the outer diameter of the rotor core 2 and larger than the outer diameter of the mounting element 6. Therefore, when the pair of end plates 4 and 5 are attached to the rotor core 2, outer circumferential regions of the opposite end faces of the rotor core 2 are exposed in the axial direction J1, as is an outer circumferential region of the second face 15 of the end plate 4.

[0017] The resin part 7 comprises a first resin section 22, a second resin section 23, and third resin sections 24. The first resin section 22 is arranged at one end of the rotor core 2 in the axial direction J1 such that it covers at least the outer circumferential region of the second surface 15 of the end plate 4. In the first embodiment, the first resin section 22 is essentially disk-shaped and is arranged at one end of the rotor core 2 in the axial direction J1 such that it covers the outer circumferential surface of the mounting element 6, the outer circumferential region of the second surface 15 of the end plate 4, the outer circumferential surface of the end plate 4, and the outer circumferential region of one end surface of the rotor core 2 in the axial direction J1. The second resin section 23 is arranged at the opposite end of the rotor core 2 in the axial direction J1 such that it covers at least the outer circumferential region of the second surface 15 of the end plate 4.In the first embodiment, the second resin section 23 is essentially disk-shaped and is arranged at the opposite end of the rotor core 2 in the axial direction J1 such that it covers the second surface 15 of the end plate 5, the outer circumferential surface of the end plate 5, and the outer circumferential region of the opposite end surface of the rotor core 2 in the axial direction J1. The second resin section 23 covers the second surface 15 of the end plate 5, leaving an inner circumferential region of the second surface 15 of the end plate 5 uncovered. The third resin sections 24 are arranged on the rotor core 2 such that they connect the first resin section 22 and the second resin section 23 on the outside of the rotor core 2. In the first embodiment, the third resin sections 24 are essentially rod-shaped and are arranged on the rotor core 2 such that they fill the recessed sections 13 of the rotor core 2.

[0018] The resin part 7 is formed from a resin. Typically, the resin part 7 is formed, for example, by insert molding. Specifically, molten resin is poured into a mold containing the rotor core 2, which is fitted with the majority of magnets 3 and the pair of end plates 4 and 5. The resin is then cured to form the resin part 7 on the rotor core 2, which is fitted with the majority of magnets 3 and the pair of end plates 4 and 5. As in Fig. As shown in Figure 2, the resin part 7 covers the heads of the screws 21 that protrude from the end plate 5. Fig. As shown in Figure 5, the projecting sections 9 in the radial direction K1 of the rotor core 2 extend further outwards than the resin part 7.

[0019] In the resin molding of the rotor core 2 described above, the molten resin flows into the resin inlet sections 18 and is then cured in these sections. Thus, the resin part 7 fills the resin inlet sections 18. Hereinafter, sections of the resin part 7 that fill the resin inlet sections 18 are referred to as engagement sections 25. The engagement sections 25 are fitted into the resin inlet sections 18 and engage with them. In the first embodiment, a plurality of engagement sections 25 are provided on the first resin section 22. These plurality of engagement sections 25 are arranged side by side in the circumferential direction of the first resin section 22. Furthermore, in the first embodiment, a plurality of engagement sections 25 are provided on the second resin section 23. These plurality of engagement sections 25 are arranged side by side in the circumferential direction of the second resin section 23.

[0020] In the configuration where the rotor core 2 is formed from resin, the first resin section 22 has a substantially hollow cylindrical shape and surrounds the exterior of the mounting element 6. A centrifugal force acts on the first resin section 22 due to rotation of the rotor 1. In a configuration where the first resin section 22 has a large thickness in the axial direction J1 and a small thickness in the radial direction K1, the first resin section 22 tends to deform slightly outward in the radial direction K1 when a centrifugal force acts upon it. In a configuration where, however, the first resin section 22 has a small thickness in the axial direction J1 and a large thickness in the radial direction K1, the first resin section 22 tends not to deform slightly outward in the radial direction K1 when a centrifugal force acts upon it.The relationship described above exists as long as the first resin section 22 has an essentially hollow cylindrical shape.

[0021] As in Fig. As shown in Figure 2, the mounting element 6 is provided on the rotor core 2, thus preventing the first resin section 22 from having a large thickness in the radial direction K1. Therefore, according to the relationship described above, the first resin section 22 tends to deform slightly outwards in the radial direction K1. Without the resin insertion sections 18 provided in the end plates 4 and 5, it is likely that the deformation-prone first resin section 22 will damage the third resin sections 24 as a result of a centrifugal force acting on the first resin section 22 during high-speed rotation of the rotor 1. Damage to the third resin sections 24 can cause the first resin section 22 to separate from the rotor core 2.

[0022] As described above, it is impossible for the first resin section 22 to have a large thickness in the radial direction K1, since the mounting member 6 extends outwards in the radial direction K1. The mounting member 6 extends outwards in the radial direction K1 due to the positions of the screw holes 20 in the mounting member 6. In other words, the mounting member 6 extends outwards in the radial direction K1 due to the positions of the screws 21 provided in the rotor 1. This aspect will be further explained below by means of the Fig. 6, Fig. 7 to Fig. 8 described.

[0023] The screws 21 provided in the rotor 1 serve to counteract a centrifugal force that acts on the rotor core 2 and the magnets 3 during rotation of the rotor 1. As shown in Fig. Figure 6 shows that in the rotor 1 according to the first embodiment, the majority of electromagnetic steel sheets are fastened by screws 21, each of which passes through the rotor core 2 in the axial direction J1 between adjacent magnets 3. Each screw 21 is located between adjacent magnets 3 in the radial direction K1 of the rotor core 2 on the outside. The rotor core 2 has areas 29 of low strength between the screws 21 and the magnets 3. One area 30, which is defined by a two-dot dashed line in Fig. The surrounding area 6 contributes to a centrifugal force acting on the areas 29 of low strength of the rotor core 2. In the first embodiment, through-holes 31 extending in the axial direction J1 are formed in an inner edge region of the rotor core 2. This configuration helps to reduce magnetic flux deflection. Without the through-holes 31, magnetic flux deflection occurs, reducing the amount of magnetic flux contributing to torque generation and thus reducing the torque. That is, the occurrence of magnetic flux deflection leads to a reduction in motor power.

[0024] Fig. Figure 7 shows an example in which the screws 21 are positioned further inwards in the radial direction K1 than in the first embodiment. In the Fig. In the configuration shown, the areas 29 of lower strength of the rotor core 2 are narrower than in the one shown. Fig. Configuration 6 shown. In the Fig. In the configuration shown in Figure 7, the areas 30 that contribute to the centrifugal force acting on the areas 29 of lower strength of the rotor core 2 are greater than in the configuration shown in Figure 7. Fig. Configuration 6 shown. In the Fig. In the configuration shown in Figure 7, the rotor core 2 is therefore susceptible to damage during rotation of the rotor 1. In other words, in the configuration shown in Fig. The configuration of rotor core 2 shown in Figure 7 exhibits lower resistance to high-speed rotation of rotor 1.

[0025] Fig. Figure 8 shows an example in which the screws 21 are positioned further inwards in the radial direction K1 than in the Fig. Configuration 7 shown. In the configuration shown in Fig. In the configuration shown in Figure 8, the screws 21 are positioned further inwards than the magnets 3 in the radial direction K1. Normally, the screws 21 are positioned in the inner edge region of the rotor core 2. In the configuration shown in Figure 8, the screws 21 are positioned further inwards than the magnets 3 in the radial direction K1. Fig. In the configuration shown in Figure 8, the areas 30 that contribute to the centrifugal force acting on the areas 29 of lower strength of the rotor core 2 are greater than in the configuration shown in Figure 8. Fig. 7 configuration shown. Specifically, in the configuration shown in Fig. In the configuration shown in Figure 8, the areas of low strength of the rotor core 2 almost entirely absorb the centrifugal force acting on the rotor core 2 and the magnets 3. In the configuration shown in Figure 8, the areas of low strength of the rotor core 2 and the magnets 3 absorb almost the entire centrifugal force. Fig. In the configuration shown in Figure 8, the areas 29 of lower strength of the rotor core 2 are narrower than in the one shown in Figure 8 due to the through holes 31 formed in the rotor core 2 to prevent magnetic leakage flux from the magnets 3. Fig. Configuration 7 shown. In the configuration shown in Fig. In the configuration shown in Figure 8, the rotor core 2 is therefore more susceptible to damage during a rotation of the rotor 1 than in the configuration shown in Figure 8. Fig. 6 configuration shown and the one in Fig. 7 configuration shown. In other words, the configuration shown in Fig. The configuration of rotor core 2 shown in Figure 8 exhibits even lower resistance to high-speed rotation of rotor 1.

[0026] As described above, for the resistance of the rotor 1 to high-speed rotation, it is preferable to position the screws 21 as far out as possible in the radial direction K1 of the rotor core 2. The force acting on the rotor core 2 of the rotor 1 decreases the further out the screws 21 are positioned. Therefore, the configuration of the rotor 1 according to the first embodiment is resistant to high-speed rotation. The fastening strength of the screws 21 against the torque in the circumferential direction of the rotor 1 (reaction torque) increases the further out the screws 21 are positioned. In motor design, therefore, it is generally desirable to position the screws 21 as far out as possible.

[0027] In the case of the resin-molded rotor core 2, the first resin section 22 has sufficient thickness in the axial direction J1 to prevent the magnets 3 from interfering with the links provided near the first resin section 22. For example, a thickness of approximately 10 mm is sufficient for the first resin section 22. The first resin section 22, with sufficient thickness, has considerable weight. Without the resin insertion sections 18 provided in the end plates 4 and 5, the considerable weight of the first resin section 22 could damage the third resin sections 24 as a result of a centrifugal force acting on the first resin section 22 during high-speed rotation of the rotor 1, and could eventually separate from the rotor core 2.In particular, in a configuration where the third resin sections 24 have an elongated rod shape, as in the example shown in the drawings, the third resin sections 24 are susceptible to damage caused by the centrifugal force acting on the first resin section 22. Without the resin insertion sections 18 provided in the end plates 4 and 5, the second resin section 23 can also separate from the rotor core 2, as in the case of the first resin section 22.

[0028] In the case of rotor 1 according to the first embodiment, the resin section 7 has engagement sections 25 that engage with the resin inlet sections 18 formed in the end plates 4 and 5. This configuration makes the third resin sections 24 less susceptible to damage caused by the centrifugal force acting on the first resin section 22 and the second resin section 23 during high-speed rotation of the rotor 1. Thus, in rotor 1 according to the first embodiment, the resin section 7 is less susceptible to damage during rotation of the rotor 1.

[0029] In the following, a rotor 1a according to a second embodiment of the present invention is described with reference to the Fig. 9, Fig. 10 to Fig. 11. It should be noted that components assigned the same reference numerals as in the first embodiment each have the same function as described in the first embodiment, and therefore a subsequent description of them is unnecessary. The rotor 1a according to the second embodiment includes a pair of end plates 4 and 5, which differ from those in the first embodiment.

[0030] In the first embodiment, the resin inlet sections 18 have a recessed shape. In the second embodiment, however, the resin inlet sections 18 are through holes extending through the end plates 4 and 5 in the axial direction J1. The resin inlet sections 18 are, for example, circular through holes. This configuration, in which the resin inlet sections 18 are circular through holes, reduces the cost of forming the resin inlet sections 18. With respect to the axial direction J1, the resin inlet sections 18 are positioned to correspond to the respective magnets 3 provided in the rotor core 2. The pair of end plates 4 and 5 are therefore attached to the rotor core 2 such that the resin inlet sections 18 correspond to the respective grooves 10 of the rotor core 2 in the axial direction J1.

[0031] As described above, the magnets 3 positioned in the slots 10 of the rotor core 2 have exposed sections 26 that are exposed from the rotor core 2 in the axial direction J1 of the rotor core 2. As in Fig. Figure 9 shows the resin insertion sections 18 arranged in positions corresponding to the exposed sections 26 of the magnets 3 in the axial direction J1 of the rotor core 2. Before the resin part 7 is formed, the exposed sections 26 are brought through the resin insertion sections 18, configured as through holes, to the outside of the rotor core 2.

[0032] In the second embodiment, the magnets 3 each have a deck section 27 that covers their outer surface. The deck sections 27 are made of a resin. In the configuration where the deck sections 27 are made of a resin, the magnets 3 are fixed to the rotor core 2 using the deck sections 27.

[0033] In the configuration where the resin inlet sections 18 are through-holes, the engagement sections 25 of the resin part 7 extend through the resin inlet sections 18 and reach the deck sections 27 of the magnets 3. As described above, the engagement sections 25 are formed during the resin molding of the rotor core 2 by allowing molten resin to flow into the resin inlet sections 18, where the resin then hardens. Thus, the engagement sections 25 bond to the deck sections 27 of the magnets 3. For example, the deck sections 27 and the resin part 7 are formed from an epoxy resin. The deck sections 27 and the resin part 7 are not limited to being formed from an epoxy resin, as long as they are formed from the same type of resin.

[0034] In the configuration where the resin inlet sections 18 are through holes, the magnets 3 can be fixed to the rotor core 2 during resin molding. During resin molding, molten resin is poured into a mold containing the rotor core 2, which is equipped with the majority of magnets 3 and the pair of end plates 4 and 5. The molten resin poured into the mold enters the gaps between the magnets 3 and the projecting sections 9 through the resin inlet sections 18 in the end plates 4 and 5. The resin then hardens in the gaps between the magnets 3 and the projecting sections 9, thus fixing the magnets 3 to the rotor core 2. This forms the cover sections 27, which cover the outer surfaces of the magnets 3.

[0035] The molten resin poured into the mold fills the resin inlet sections 18, configured as through-holes, and enters the gap between the magnets 3 and the projecting sections 9 through these inlet sections. That is, the resin in the resin inlet sections 18 and the resin between the magnets 3 and the projecting sections 9 are continuous. The first resin section 22, positioned on the side of the end plate 4, the second resin section 23, positioned on the side of the end plate 5, the third resin sections 24, which connect the first resin section 22 and the second resin section 23, the engagement sections 25, which engage with the resin inlet sections 18, and the cover sections 27, which fix the magnets 3 to the rotor core 2, are integrally formed by pouring molten resin into the mold and then curing the resin in the mold.The deck sections 27 are formed integrally with the engagement sections 25 during the resin molding of the rotor core 2 by allowing molten resin to flow through the resin introduction sections 18 into the resin introduction sections 18 and into areas around the magnets 3, and then the resin in the resin introduction sections 18 and the resin in the areas around the magnets 3 is hardened.

[0036] In the case of rotor 1a according to the second embodiment, the engagement sections 25 bond to the cover sections 27, which cover the outer surfaces of the magnets 3. The engagement sections 25 and the cover sections 27 are made of an epoxy resin. Therefore, in rotor 1a according to the second embodiment, the engagement sections 25 can bond firmly to the magnets 3, and thus the engagement sections 25 can be stably engaged with the resin insertion sections 18.

[0037] In the case of rotor 1a according to the second embodiment, the magnets 3 are fixed to the rotor core 2 during the resin molding process. In rotor 1a according to the second embodiment, the resin inlet sections 18 can be used to engage with the engagement sections 25 to ensure flow paths so that the resin flows into the areas around the magnets 3, thus reducing the cost of forming the deck sections 27.

[0038] According to at least one of the embodiments described above, the resin part 7 is formed from a resin for shaping the rotor core 2 and fills the resin inlet sections 18 of the end plates 4 and 5. Thus, it is possible to provide a rotor 1 or 1a that includes a resin part 7 formed from a molding resin and which is less susceptible to damage during rotation of the rotor 1 or 1a.

[0039] Although the present disclosure has been described in detail above, it is not limited to the aforementioned individual embodiments. Various modifications, such as additions, replacements, adaptations, and partial deletions, may be made to the aforementioned embodiments, provided that such modifications do not deviate from the core content of the present disclosure or from the core content of the present disclosure as set forth in the appended claims or their equivalents. Any of the aforementioned embodiments may be implemented in combination with one another. For example, the sequence of operations or the sequence of processes mentioned in the aforementioned embodiments are merely examples, and the present disclosure is not limited to them.The same applies to numerical values ​​or mathematical formulas used in the description of the aforementioned embodiments, if any.

[0040] For example, the resin introduction sections 18 can be used in Fig. 12 configurations shown, one in Fig. 13 configurations shown or one in Fig. exhibit the configuration shown in 14. In the case of a rotor 1b according to a [document / section] Fig. In the modification example 1 shown in Figure 12, an annular resin inlet section 18 is provided on the second surface 15 of the end plate 4. The annular resin inlet section 18 is concentric with the end plate 4. The annular resin inlet section 18 is in the form of a groove that is recessed towards the first surface 14. In the case of a rotor 1c according to a Fig. In Modification Example 2 shown in Figure 13, a plurality of substantially arcuate resin inlet sections 18 are provided on the second surface 15 of the end plate 4. The plurality of substantially arcuate resin inlet sections 18 are arranged on the same circle. Each of the substantially arcuate resin inlet sections 18 is a through-hole extending through the end plate 4 in the axial direction J1. In this case, the resin inlet sections 18 are arranged in the positions corresponding to the magnets 3 in the axial direction J1. In the case of a rotor 1d according to a Fig. In Modification Example 3 shown in Figure 14, a plurality of substantially rectangular resin insertion sections 18, extending in the radial direction K1 of the end plate 4, are provided on the second surface 15 of the end plate 4. The plurality of substantially rectangular resin insertion sections 18 are arranged in a radial pattern. Each of the substantially rectangular resin insertion sections 18 is a through-hole extending in the axial direction J1 through the end plate 4. In this case, the resin insertion sections 18 are arranged in the positions corresponding to the magnets 3 in the axial direction J1. In the rotor 1b according to the one shown in Figure 14, the resin insertion sections 18 are arranged in the axial direction J1. Fig. Modification example 1 shown in 12, the rotor 1c according to the one in Fig. Modification example 2 shown in 13 and rotor 1d according to the one in Fig. In the modification example 3 shown in Figure 14, the end plate 5 has the same configuration as the end plate 5 used in rotor 1a according to the second embodiment. In rotor 1b according to the one shown in Figure 14, the end plate 5 has the same configuration as the end plate 5 used in rotor 1a according to the second embodiment. Fig. Modification example 1 shown in 12, the rotor 1c according to the one in Fig. Modification example 2 shown in 13 and rotor 1d according to the one in Fig. In modification example 3 shown in Figure 14, the end plate 5 can have the same configuration as the end plate 4. Apart from what has been described above, the rotor 1b according to modification example 1, the rotor 1c according to modification example 2, and the rotor 1d according to modification example 3 have the same configuration as the rotor 1 according to the first embodiment and the rotor 1a according to the second embodiment.

[0041] The rotors 1 and 1a according to the embodiments described above, as well as the rotors 1b, 1c and 1d according to the modification examples described above, can be applied to rotors of SPM motors (Surface Permanent Magnet) or rotors of IPM motors (Interior Permanent Magnet).

[0042] In rotors 1 and 1a according to the embodiments described above, and in rotors 1b, 1c, and 1d according to the modification examples described above, the resin inlet sections 18 are provided on the second surface 15 of each of the pair of end plates 4 and 5. Alternatively, the resin inlet sections 18 can be provided on either of the end plates 4 and 5. In other words, it is sufficient that the resin inlet sections 18 are provided on the second surface 15 of at least one of the pair of end plates 4 and 5.

[0043] Further remarks regarding the aforementioned embodiments are disclosed below. (Additional Note 1)

[0044] A rotor (1) comprises: a rotor core (2) rotatable about a rotating shaft (28) serving as the center of rotation; a plurality of magnets (3) provided in the rotor core (2); a pair of end plates (4 and 5) provided at opposite ends of the rotor core (2) in an axial direction of the rotor core (2), each of the pair of end plates (4 and 5) having a first surface (14) located in the direction of the rotor core (2) and a second surface (14) located in the direction of the rotor core (2).surface (15) located opposite the first surface (14); and a resin part (7) comprising a first resin section (22) covering at least one outer circumferential region of the second surface (15) of one of the end plates (4), a second resin section (23) covering at least one outer circumferential region of the second surface (15) of the other end plate (5), and third resin sections (24) connecting the first resin section (22) and the second resin section (23) on the outside of the rotor core (2). The second surface (15) of at least one of the pair of end plates (4 and 5) has one or more resin inlet sections (18) filled with the resin part (7). (Additional Note 2)

[0045] In the rotor (1) according to additional note 1, the resin inlet sections (18) are preferably through holes passing through at least one of the pair of end plates (4 and 5), the magnets (3) have exposed sections (26) that are exposed from the rotor core (2) in the axial direction of the rotor core (2), and the resin inlet sections (18) are arranged in the positions corresponding to the exposed sections (26) in the axial direction of the rotor core (2). (Additional Note 3)

[0046] In the rotor (1) according to additional note 2, the magnets (3) preferably each have a deck section (27) which covers an outer surface, and the deck sections (27) and the resin part (7) are formed from an epoxy resin. (Additional note 4)

[0047] In the rotor (1) according to one of the additional notes 1 to 3, the resin introduction sections (18) are preferably provided on the second surface (15) of each of the pair of end plates (4 and 5). (Additional note 5)

[0048] In the rotor (1) according to one of the additional notes 1 to 4, the rotor core (2) preferably has a plurality of electromagnetic steel sheets stacked on top of each other in an axial direction of the rotating shaft (28), the plurality of magnets (3) are provided in a radial pattern in the rotor core (2), and the plurality of electromagnetic steel sheets are fastened with screws (21) which each pass through the rotor core (2) between adjacent magnets (3) and under the plurality of magnets (3). Reference symbol list 1 Rotor 2 rotor core 3 Magnet 4 End plate 5 End plate 7 Resin part 14 first area 15 second area 18 Resin introduction section 21 screw 22 first Harz section 23 second Harz section 24 third Harz section 26 exposed section 27 Deck section 28 Rotary shaft QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2008-199725

[0004]

Claims

[1] Rotor, comprising: a rotor core that can be rotated around a rotating shaft serving as the center of rotation; a plurality of magnets provided in the rotor core; a pair of end plates provided at opposite ends of the rotor core in an axial direction of the rotor core, each of the pair of end plates having a first face or surface located in the direction of the rotor core and a second face or surface located opposite the first face or surface; and a resin part comprising a first resin section covering at least an outer circumferential region of the second surface of one of the end plates, a second resin section covering at least an outer circumferential region of the second surface of the other end plate, and third resin sections connecting the first resin section and the second resin section on the outside of the rotor core, wherein the second surface of at least one of the pair of end plates has one or more resin insertion sections that are filled with the resin part. [2] Rotor according to claim 1, wherein The resin injection sections are through holes that pass through at least one of the pair of end plates. the magnets have exposed sections that are exposed from the rotor core in the axial direction of the rotor core, and The resin injection sections are arranged in the exposed sections in corresponding positions in the axial direction of the rotor core. [3] Rotor according to claim 2, wherein The magnets each have a deck section that covers an outer surface, and The deck sections and the resin part are made of an epoxy resin. [4] Rotor according to any one of claims 1 to 3, wherein the resin inlet sections are provided on the second surface of each of the pair of end plates. [5] Rotor according to any one of claims 1 to 4, wherein the rotor core has a plurality of electromagnetic steel sheets stacked on top of each other in an axial direction of the rotating shaft, the majority of magnets are provided in a radial pattern in the rotor core, and The majority of electromagnetic steel sheets are fastened with screws, each passing through the rotor core between adjacent magnets under the majority of magnets.

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