WO2019003801A1 - Rotor and motor - Google Patents
Rotor and motor Download PDFInfo
- Publication number
- WO2019003801A1 WO2019003801A1 PCT/JP2018/021170 JP2018021170W WO2019003801A1 WO 2019003801 A1 WO2019003801 A1 WO 2019003801A1 JP 2018021170 W JP2018021170 W JP 2018021170W WO 2019003801 A1 WO2019003801 A1 WO 2019003801A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- core
- cover
- hole
- magnet
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
Definitions
- the present invention relates to a rotor and a motor.
- a rotor comprising a rotor core and a rotor cover covering a permanent magnet, and a motor comprising such a rotor are known (e.g. Patent Document 1).
- the present invention is capable of suitably suppressing the relative rotation of the rotor cover with respect to the rotor core while stably holding the magnet in the rotor cover, and a motor including such a rotor.
- One of the purposes is to provide.
- One aspect of the rotor according to the present invention is a shaft disposed along a central axis extending in one direction, a rotor core fixed to the shaft, a magnet positioned radially outward of the rotor core, and a diameter of the magnet
- a rotor cover having a cylindrical portion surrounding the rotor core and the magnet on the outer side, and a resin portion at least a part of which is positioned radially inward of the rotor cover, the rotor core axially extending the rotor core
- the rotor cover has a flange portion that protrudes radially inward from the cylindrical portion, and a claw portion that protrudes in the axial direction from the flange portion, and the resin portion has a core through hole that penetrates through the core portion.
- a first lid portion positioned on one side in the axial direction of the rotor core, the magnet, and the flange portion, and an axial direction of the rotor core and the magnet
- the claw portion includes a second lid portion located on the other side, and a first connecting portion axially extending through the core through hole and connecting the first lid portion and the second lid portion. Is hooked to the rotor core or the resin portion.
- One aspect of the motor of the present invention includes the above-described rotor, and a stator that faces the rotor in the radial direction via a gap.
- a rotor capable of suitably suppressing relative rotation of the rotor cover with respect to the rotor core while stably holding the magnet in the rotor cover, and a motor including such a rotor Provided.
- FIG. 1 is a cross-sectional view showing the motor of the first embodiment.
- FIG. 2 is a perspective view showing a part of the rotor of the first embodiment.
- FIG. 3 is a perspective view showing a part of the rotor of the first embodiment.
- FIG. 4 is an exploded perspective view showing a part of the rotor of the first embodiment.
- FIG. 5 is a view showing the rotor of the first embodiment, and is a cross-sectional view taken along the line VV in FIG.
- FIG. 6 is a view showing the rotor of the first embodiment, and is a cross-sectional view taken along the line VI-VI in FIG.
- FIG. 7 is a view of a part of the rotor of the first embodiment as viewed from below.
- FIG. 1 is a cross-sectional view showing the motor of the first embodiment.
- FIG. 2 is a perspective view showing a part of the rotor of the first embodiment.
- FIG. 3 is a perspective view showing a part
- FIG. 8 is a perspective view showing a part of the rotor of the first embodiment.
- FIG. 9 is a perspective view showing a part of a rotor in a first modified example of the first embodiment.
- FIG. 10 is a view of a part of a rotor in a second modification of the first embodiment as viewed from below.
- FIG. 11 is a perspective view showing a part of the rotor of the second embodiment.
- FIG. 12 is a perspective view showing a part of the rotor cover of the second embodiment.
- FIG. 13 is a view showing a rotor of a second embodiment, and is a cross-sectional view taken along the line XIII-XIII in FIG.
- the motor 10 includes a housing 11, a stator 12, a rotor 13 including a shaft 20 disposed along a central axis J extending in one direction, a bearing holder 14, and a bearing. And 15, 16.
- the stator 12 opposes the rotor 13 via the radial gap on the radially outer side of the rotor 13.
- the shaft 20 is rotatably supported by the bearings 15 and 16.
- the shaft 20 has a cylindrical shape extending in the axial direction Z.
- a direction parallel to one direction in which the central axis J extends is indicated by the Z axis.
- a direction parallel to one direction in which the central axis J extends is simply referred to as “axial direction Z”.
- the radial direction centered on the central axis J is simply referred to as “radial direction”
- the circumferential direction centered on the central axis J is simply referred to as “circumferential direction”.
- the positive side in the Z-axis direction is referred to as “upper side”
- the negative side in the Z-axis direction is referred to as “lower side”.
- the lower side corresponds to one side in the axial direction.
- the upper side corresponds to the other side in the axial direction.
- the upper side and the lower side are simply names for describing the relative positional relationship of each part, and the actual positional relationship may be a positional relationship other than the positional relationship etc. indicated by these names. .
- the rotor 13 includes a shaft 20, a rotor core 30, a plurality of magnets 40, a rotor cover 60, and a resin portion 50.
- the rotor core 30 has a columnar shape extending in the axial direction Z.
- the rotor core 30 is configured, for example, by laminating a plurality of plate members in the axial direction Z.
- the rotor core 30 has a rotor core main body 31 and a plurality of protrusions 33.
- the rotor core body 31 extends in the axial direction Z. More specifically, the rotor core main body 31 is a regular octagonal prism centered on the central axis J.
- the rotor core body 31 has a plurality of magnet support surfaces 32.
- the magnet support surface 32 extends in the axial direction Z.
- the magnet support surface 32 is a flat surface orthogonal to the radial direction.
- Each of the plurality of magnet support surfaces 32 is each of a plurality of radially outer side surfaces of the rotor core main body 31 which is a regular octagonal prism.
- the rotor core main body 31 has a fixing hole 31 a penetrating the rotor core main body 31 in the axial direction Z.
- the shape of the fixing hole 31 a viewed in the axial direction Z is a circular shape centering on the central axis J.
- the shaft 20 is passed through the fixing hole 31a.
- the inner peripheral surface of the fixing hole 31 a is fixed to the outer peripheral surface of the shaft 20.
- the rotor core 30 is thereby fixed to the shaft 20.
- the protrusion 33 protrudes radially outward from the rotor core main body 31.
- the protrusion 33 extends from the upper end portion of the rotor core main body 31 to the lower end portion of the rotor core main body 31.
- the radially outer surface of the protrusion 33 is a flat surface orthogonal to the radial direction.
- the circumferential dimension of the protrusion 33 increases in the radial direction from the inner side in the radial direction to the outer side in the radial direction.
- the plurality of protrusions 33 are arranged side by side along the circumferential direction.
- the circumferential intervals of the plurality of protrusions 33 are, for example, the same as one another.
- the number of the plurality of protrusions 33 is, for example, eight.
- the eight projections 33 project radially outward from the respective corners of the regular octagonal columnar rotor core body 31.
- the rotor core 30 has a plurality of core through holes 34 penetrating the rotor core 30 in the axial direction Z.
- the core through hole 34 penetrates the rotor core main body 31 in the axial direction Z.
- the plurality of core through holes 34 are arranged side by side along the circumferential direction.
- the circumferential intervals of the plurality of core through holes 34 are, for example, equal to one another.
- the core through hole 34 has a circular shape as viewed in the axial direction Z.
- the number of core through holes 34 is, for example, eight. As shown in FIG. 3, each of the core through holes 34 is located radially inward of each magnet 40.
- a part of the core through holes 34 among the plurality of core through holes 34 is a first core through hole 34 a through which a first connection portion 53 described later passes. As shown in FIG. 5, the openings 34 c and 34 d on both axial sides of the first core through hole 34 a are closed by the resin portion 50.
- another core through hole 34 among the plurality of core through holes 34 is a second core through hole 34 b located at a position different from the first connecting portion 53 as viewed along the axial direction Z. It is.
- the second core through hole is located in a position different from the first connecting portion as viewed in the axial direction means that at least a part of the second core through hole is viewed in the axial direction. 1 Including not overlapping with the connecting part.
- both of the openings 34 e and 34 f on both axial sides of the second core through hole 34 b are exposed to the outside of the rotor 13.
- the lower opening 34 e of the second core through hole 34 b is exposed to the lower side of the rotor 13.
- the upper opening 34 f of the second core through hole 34 b is exposed to the upper side of the rotor 13.
- the resin portion 50 is not disposed inside the second core through hole 34b.
- the inside of the second core through hole 34 b is a space connected to the outer space of the rotor 13 through the openings 34 e and 34 f.
- the plurality of core through holes 34 are the first core through holes 34 a, and the other plurality of core through holes 34 are the second core through holes 34 b.
- the plurality of first core through holes 34 a and the plurality of second core through holes 34 b are alternately arranged along the circumferential direction.
- the number of first core through holes 34 a and the number of second core through holes 34 b are both four, for example.
- the magnet 40 has a substantially square prism shape that is flat in the radial direction and extends in the axial direction Z. As shown in FIG. 5, the magnet 40 is located radially outward of the rotor core 30. As shown in FIGS. 3 and 4, the plurality of magnets 40 are spaced apart from one another along the circumferential direction. More specifically, the plurality of magnets 40 are arranged at equal intervals along the circumferential direction. The circumferential distance between the magnets 40 adjacent to each other in the circumferential direction increases from the inner side in the radial direction toward the outer side in the radial direction.
- each of the plurality of magnets 40 is disposed between the protrusions 33 adjacent in the circumferential direction.
- the end portions on both sides in the circumferential direction of the magnet 40 are in contact with the protrusions 33 adjacent on both sides in the circumferential direction of the magnet 40. More specifically, the radially inner ends of the circumferential ends of the magnet 40 are in contact with the protrusions 33. In this manner, the protrusions 33 can position the magnet 40 in the circumferential direction. Note that at least one of the end portions on both sides in the circumferential direction of the magnet 40 may not be in contact with the protrusion 33.
- Each of the plurality of magnets 40 is supported by the plurality of magnet support surfaces 32 from the inside in the radial direction.
- the radially inner side surface of the magnet 40 is a flat surface orthogonal to the radial direction, and is in contact with the magnet support surface 32.
- the radially outer side surface of the magnet 40 is a curved surface which is curved in the circumferential direction along the radially inner side surface of a cylindrical portion 61 of the rotor cover 60 described later.
- the center of curvature of the radially outer surface of the magnet 40 coincides with the central axis J.
- the radially outer side surface of the magnet 40 contacts the radially inner side surface of the rotor cover 60. Thereby, the magnet 40 is pinched in the radial direction in a state of being in contact with the rotor core 30 and the rotor cover 60.
- the dimension in the axial direction Z of the magnet 40 is, for example, the same as the dimension in the axial direction Z of the rotor core 30.
- the upper surface of the magnet 40 and the upper surface of the rotor core 30 are disposed, for example, on the same plane orthogonal to the axial direction Z.
- the lower surface of the magnet 40 and the lower surface of the rotor core 30 are disposed, for example, on the same plane orthogonal to the axial direction Z.
- the rotor cover 60 has a cylindrical portion 61, a flange portion 62, and a first claw portion 63.
- the tubular portion 61 has a tubular shape extending in the axial direction Z. More specifically, the cylindrical portion 61 is cylindrical around the central axis J. The cylindrical portion 61 opens on both sides in the axial direction Z. As shown in FIG. 5, the cylindrical portion 61 surrounds the rotor core 30 and the magnet 40 on the radially outer side of the magnet 40. The upper end portion of the cylindrical portion 61 is located above the upper end portion of the magnet 40 and the upper end portion of the rotor core 30.
- the flange portion 62 protrudes radially inward from the cylindrical portion 61. More specifically, the flange portion 62 protrudes radially inward from the lower end portion of the cylindrical portion 61. As shown in FIGS. 7 and 8, the flange portion 62 is in the shape of a ring plate extending in the circumferential direction. As shown in FIG. 5, the flange portion 62 is located below the rotor core 30 and the plurality of magnets 40. The radially outer edge portion of the lower surface of the rotor core main body 31 and the lower surface of the plurality of magnets 40 are in contact with the upper surface of the flange portion 62.
- the rotor core 30 and the plurality of magnets 40 are supported by the flange portion 62 from the lower side. As shown in FIG. 7, the radially inner edge of the flange portion 62 is located radially outward of the core through hole 34.
- the flange portion 62 has a plurality of cover through holes 62 a penetrating the flange portion 62 in the axial direction Z.
- the plurality of cover through holes 62a are arranged side by side along the circumferential direction.
- the intervals between the plurality of cover through holes 62a adjacent in the circumferential direction are, for example, equal to one another.
- the cover through hole 62a is a rectangular shape having a substantially rounded corner that is long in the circumferential direction as viewed in the axial direction Z.
- the cover through holes 62a overlap between the magnets 40 adjacent in the circumferential direction as viewed in the axial direction Z.
- the cover through holes 62 a overlap the protrusions 33 as viewed in the axial direction Z.
- the circumferential positions of the cover through holes 62a are the same as the circumferential positions of the protrusions 33, respectively.
- Each cover through hole 62a is located radially outside between the core through holes 34 adjacent in the circumferential direction.
- the first claw portion 63 is in the form of a plate extending from the radial inner edge of the flange portion 62 obliquely downward in the radial direction. That is, the first claw portion 63 extends from the flange portion 62 in the direction inclined with respect to the axial direction Z. Thereby, the first claw portion 63 protrudes downward from the flange portion 62. That is, the first claw portion 63 is a claw portion that protrudes from the flange portion 62 in the axial direction Z.
- the radial inner end of the first claw portion 63 is located radially outward of the inner edge of the fixing hole 31 a.
- the first claws 63 are, as viewed in the axial direction Z, between the core through holes 34 adjacent to each other in the circumferential direction, ie, between the first core through holes 34 a and the second core through holes 34 b. Be placed.
- the dimension in the circumferential direction of the first claw portion 63 decreases as it goes from the radially outer side to the radially inner side.
- the rotor cover 60 in the present embodiment has two first claws 63.
- the two first claws 63 are disposed on opposite sides of the central axis J in the radial direction.
- the resin portion 50 is located radially inward of the rotor cover 60.
- the resin portion 50 connects and holds the rotor cover 60, the rotor core 30, and the magnet 40 with each other.
- the resin portion 50 is molded as a single member by insert molding in which resin is poured into a mold into which the rotor core 30, the magnet 40 and the rotor cover 60 are inserted.
- the resin unit 50 includes a first lid 51, a second lid 52, a first connecting portion 53, and a second connecting portion 54.
- the first lid 51 and the second lid 52 have an annular plate shape with the central axis J as a center. As shown in FIG. 5, the first lid 51 is located below the rotor core 30, the magnet 40, and the flange 62. The first lid portion 51 contacts the lower surface of the flange portion 62 and the lower surface of the rotor core 30. The first lid 51 is located below the cylindrical portion 61. The first lid 51 is located outside the rotor cover 60.
- the radially inner edge of the first lid 51 is located radially outward of the fixing hole 31 a and radially inward of the first core through hole 34 a.
- the outer diameter of the first lid 51 is smaller than the outer diameter of the tubular portion 61.
- the radially outer edge of the first lid 51 is located radially outward of the cover through hole 62 a and radially inward of the outer peripheral surface of the cylindrical portion 61.
- the first lid 51 closes the first core through hole 34 a and the cover through hole 62 a from the lower side.
- the first claw portion 63 is embedded in the inside of the first lid portion 51. Thereby, the first claw portion 63 which is the claw portion is hooked to the resin portion 50. In the present embodiment, the entire first claw portion 63 is embedded in the first lid portion 51.
- the second lid 52 is located above the rotor core 30 and the magnet 40.
- the second lid 52 is disposed radially inward of the upper end portion of the cylindrical portion 61.
- the second lid 52 contacts the top surface of the magnet 40 and the top surface of the rotor core 30.
- the upper surface of the second lid 52 is, for example, at the same position as the upper end of the cylindrical portion 61 in the axial direction Z.
- the radially inner edge of the second lid 52 is located radially outward of the fixing hole 31 a and radially inward of the first core through hole 34 a.
- the outer diameter of the second lid 52 is substantially the same as the inner diameter of the cylindrical portion 61.
- the radially outer edge of the second lid 52 contacts the inner circumferential surface of the cylindrical portion 61.
- the second lid 52 closes the first core through hole 34 a from the upper side.
- the second lid 52 has a step 52 b at the radially outer edge.
- the stepped portion 52 b is a portion in which the upper surface of the second lid 52 is recessed downward from the inner side in the radial direction toward the outer side in the radial direction. As shown in FIG. 2, the step portion 52 b is provided on the entire periphery of the radially outer edge portion of the second lid portion 52.
- the first lid 51 and the second lid 52 have recessed portions 51a and 52a.
- the second lid 52 has four recesses 52 a.
- the recess 52 a is recessed radially outward from the radially inner edge of the second lid 52.
- the four recesses 52a are arranged at equal intervals along the circumferential direction.
- the recess 52 a overlaps with the second core through hole 34 b as viewed in the axial direction Z. That is, the upper opening 34f of the second core through hole 34b is exposed to the upper side of the rotor 13 through the recess 52a.
- the first lid 51 has four concave portions 51 a like the second lid 52. As shown in FIG. 6, the recess 51 a is recessed radially outward from the radial inner edge of the first lid 51. The lower opening 34 e of the second core through hole 34 b is exposed to the lower side of the rotor 13 via the recess 51 a.
- the first connecting portion 53 extends in the axial direction Z through the core through hole 34 and connects the first lid 51 and the second lid 52.
- the resin portion 50 can be prevented from coming off the rotor core 30, and the resin portion 50 and the rotor core 30 can be connected.
- the first lid 51 and the second lid 52 are connected by the first connecting portion 53 passing through the first core through hole 34a, and the first claw portion 63 is made of resin.
- the rotor core 30 and the rotor cover 60 are connected via the resin portion 50. Therefore, it is possible to suppress the rotor core 30 from coming out of the rotor cover 60 in the axial direction Z and the relative rotation of the rotor cover 60 with respect to the rotor core 30.
- unlike the case where an adhesive is used even when each portion thermally expands, etc., it is possible to prevent the fixing of the rotor core 30 and the rotor cover 60 from being detached. Therefore, relative rotation of the rotor cover 60 with respect to the rotor core 30 can be suitably suppressed.
- first cover 51 and the second cover 52 can be used as a retainer for the magnet 40 in the axial direction Z. Thereby, it is possible to suppress the magnet 40 from coming out of the inside of the rotor cover 60 in the axial direction Z.
- the resin part 50 can be produced by the above-mentioned insert molding. Therefore, regardless of the dimensional error of the magnet 40, it is easy to make the resin portion 50 in contact with the magnet 40. Thus, the formation of a gap between the resin portion 50 and the magnet 40 can be suppressed, and the magnet 40 can be stably held in the rotor cover 60.
- the rotor 13 capable of suppressing the relative rotation of the rotor cover 60 with respect to the rotor core 30 while stably holding the magnet 40 in the rotor cover 60.
- the vibration generated from the motor 10 it is possible to reduce the vibration generated from the motor 10. Therefore, the noise generated from the motor 10 can be reduced, and the motor 10 can be driven efficiently.
- the resin portion 50 has both functions of holding the magnet 40 and preventing rotation of the rotor cover 60, the number of assembling steps of the rotor 13 can be easily reduced. Specifically, by forming the resin portion 50 by the above-described insert molding, both of the stable holding of the magnet 40 and the suitable rotation stopper of the rotor cover 60 can be realized. Therefore, for example, as compared with the case where the axial direction both ends of the cover are bent to prevent the magnet from coming off and the cover is adhered to the magnet with an adhesive, the assembly of the rotor 13 can be facilitated. In addition, it is not necessary to use an adhesive to hold the magnet 40, and there is no need for a process and equipment for curing the adhesive.
- the first claw portion 63 is embedded in the first lid portion 51, the first claw portion 63 is firmly fixed to the resin portion 50. Therefore, the connection between the rotor cover 60 and the resin portion 50 can be further strengthened, and the relative rotation of the rotor cover 60 with respect to the rotor core 30 can be further suppressed.
- the first claw portion 63 extends from the flange portion 62 in a direction inclined with respect to the axial direction Z. Therefore, the dimension in the extending direction of the first claw portion 63 can be increased while the dimension in the axial direction Z of the first claw portion 63 is relatively reduced. Thereby, the length by which the first claw portion 63 is embedded in the first lid portion 51 can be increased, and the first claw portion 63 can be fixed to the resin portion 50 more firmly. Therefore, relative rotation of the rotor cover 60 with respect to the rotor core 30 can be further suppressed.
- the rotor cover 60 since the rotor cover 60 has the flange portion 62 located on the lower side of the rotor core 30, the rotor portion 30 and the magnet 40 can be supported from the lower side by the flange portion 62. Thereby, the rotor core 30 and the magnet 40 can be further suppressed from coming off the lower side of the rotor cover 60.
- the first connecting portion 53 passes through the first core through hole 34 a of the core through holes 34.
- the first connecting portion 53 has a cylindrical shape extending in the axial direction Z.
- the outer peripheral surface of the first connection portion 53 is in contact with the inner peripheral surface of the first core through hole 34a.
- the first connection portion 53 is filled in the first core through hole 34a.
- the resin portion 50 has a plurality of first connecting portions 53.
- the plurality of first connection portions 53 pass through each of the plurality of first core through holes 34 a. Thereby, resin part 50 and rotor core 30 can be connected more firmly.
- the second connecting portion 54 extends in the axial direction Z through the cover through hole 62 a and connects the first lid 51 and the second lid 52.
- the second connection portion 54 passes between the magnets 40 adjacent in the circumferential direction. Therefore, magnets 40 adjacent in the circumferential direction can be connected via the second connection portion 54. Thereby, it can suppress that the magnet 40 shifts
- the cover through holes 62 a overlap with the magnets 40 adjacent in the circumferential direction as viewed in the axial direction Z. Therefore, when the resin portion 50 is formed by the above-described insert molding, the resin can be easily passed through the magnets 40 adjacent to each other in the circumferential direction and the cover through hole 62a. Thereby, resin can be suitably filled between magnets 40 adjacent to each other in the circumferential direction to form the second connecting portion 54. Therefore, the magnet 40 can be further suppressed from being shifted in the circumferential direction. Moreover, before forming the resin part 50, it is easy to confirm the circumferential direction position of the magnet 40 via the cover through hole 62a.
- the resin portion 50 has a plurality of second connecting portions 54.
- the plurality of second connection portions 54 pass through each of the plurality of cover through holes 62 a.
- resin part 50 and rotor cover 60 can be connected more firmly. Therefore, relative rotation of the rotor cover 60 with respect to the rotor core 30 can be further suppressed.
- the plurality of cover through holes 62a are arranged side by side along the circumferential direction, so the second connecting portions 54 that are passed through the plurality of cover through holes 62a are also along the circumferential direction. It arranges side by side over the circumference.
- the intervals between the second connection portions 54 adjacent in the circumferential direction are, for example, the same as each other.
- the cover through holes 162a of the rotor cover 160 extend in the circumferential direction.
- the dimension of the cover through hole 162 a in the circumferential direction is equal to or greater than the dimension of the magnet 40 in the circumferential direction. Therefore, even when the positioning accuracy in the circumferential direction of the rotor cover 160 is relatively low, the cover through hole 162a can be viewed along the axial direction Z and easily overlapped with the magnets 40. Thereby, when producing the resin part 50 by insert molding mentioned above, it can be easy to flow resin between magnets 40 comrades.
- the dimension in the circumferential direction of the cover through hole 162a is, for example, about twice the dimension in the circumferential direction of the magnet 40.
- the flange portion 162 has four cover through holes 162a.
- the two protrusions 33 and the three magnets 40 overlap each other in the axial direction Z for each of the cover through holes 162 a.
- the first claw portion 163 overlaps, for example, the second core through hole 34 b as viewed in the axial direction Z.
- the cover through holes 262a of the rotor cover 260 extend in the circumferential direction.
- the dimension of the cover through hole 262a in the circumferential direction is larger than the dimension of the cover through hole 162a shown in FIG. 9 in the circumferential direction.
- the circumferential dimension L2 of the portion 262b of the flange portion 262 located between the circumferentially adjacent cover through holes 262a is smaller than the circumferential distance L1 between the circumferentially adjacent magnets 40.
- the distance L1 and the dimension L2 differ depending on the radial position.
- the dimension L2 may be smaller than the distance L1 at the same radial position. That is, for example, as long as the radial positions are different from each other, the dimension L2 may be equal to or greater than the distance L1.
- the circumferential dimension L2 of the portion 262b is preferably, for example, twice or more the thickness of the flange portion 262 in the axial direction Z.
- the rotor cover 360 has an extending portion 363 and a second claw portion 364.
- the extension portion 363 extends radially inward from the radial inner edge of the flange portion 62.
- the extending portion 363 is the same as the first claw portion 63 of the first embodiment except that the extending direction is different.
- the extending portion 363 contacts the lower surface of the rotor core main body 31 and supports the rotor core 30 from the lower side.
- the second claw portion 364 is a plate-shaped first portion 364 a protruding radially inward from the radial inner edge of the flange portion 62, and an upper end from the radial inner end of the first portion 364 a And a plate-like second portion 364b extending in Thereby, the second claw portion 364 protrudes upward from the flange portion 62. That is, the second claw portion 364 is a claw portion that protrudes from the flange portion 62 in the axial direction Z.
- the first portion 364a curves upward from the radially outer side toward the radially inner side.
- the second claw portion 364 is located in the core through hole 34.
- the second claw portion 364 as the claw portion is hooked on the rotor core 30. Therefore, the rotor cover 360 can be directly connected to the rotor core 30, and the relative rotation of the rotor cover 360 with respect to the rotor core 30 can be further suppressed. Further, the rotor cover 360 can be positioned in the circumferential direction with respect to the rotor core 30. Thus, the cover through holes 62a can be easily overlapped in the circumferential direction of the magnets 40 as viewed in the axial direction Z.
- At least a part of the second claw portion 364 is located in the second core through hole 34 b. Therefore, when making resin part 50 by insert molding mentioned above, it can control that the 2nd nail part 364 is pushed out from the inside of the 2nd core penetration hole 34b by resin.
- the second portion 364 b of the second claw portion 364 is located in the core through hole 34. The circumferential end of the second portion 364 b contacts the inner side surface of the core through hole 34 or faces in the circumferential direction with a gap.
- the present invention is not limited to the above-described embodiment, and other configurations can be adopted.
- the number of first connection parts and the number of second connection parts are not particularly limited as long as they are at least one or more.
- the second connecting portion passes through the cover through hole, it does not have to pass between the magnets adjacent in the circumferential direction.
- the number of magnets is not particularly limited.
- a part of the resin portion may be disposed inside the second core through hole.
- One of the openings on both sides in the axial direction of the second core through hole may be closed by the resin portion.
- the core through holes do not include the second core through holes, and may be all first core through holes.
- the number of core through holes is not particularly limited.
- a rotor cover is not restricted to this.
- the rotor cover may have both the first and second claws as the claws.
- the number of first claws 63 may be one or three or more.
- the number of second claws 364 may be two or more. In this case, each of the plurality of second claws 364 is located in each of the plurality of core through holes 34.
- the cover through holes do not have to overlap between magnets adjacent in the circumferential direction as viewed in the axial direction Z.
- the flange portion may not have a cover through hole. In this case, the resin portion does not have the second connection portion.
- the flange portion may not be annular.
- the rotor cover may have, for example, a plurality of flanges spaced along the circumferential direction.
- the shaft is not limited to a solid but may be a hollow member. In each embodiment described above, the number of magnets 40 is eight (ie, the number of poles is eight). However, the number of magnetic poles of the rotor may be changed as appropriate.
- the shape of the magnet 40 is not limited to the above-described shape, and may be another shape.
- the rotor core main body 31 is not limited to the octagonal prismatic shape, and may be a polygonal pillar, a cylindrical shape, or the like according to the shape and the number of the magnets 40, and is not particularly limited.
- the bearing holder 14 may be integral with a lid member covering the opening of the housing 11. That is, the bearing holder 14 and the lid member covering the opening of the housing 11 may be a part of a single member.
- the application of the motor provided with the rotor of each embodiment described above is not particularly limited.
- the motor provided with the rotor of each embodiment mentioned above is mounted in an electric pump, an electric power steering, etc., for example.
- Each structure mentioned above can be combined suitably, as long as it does not contradict each other.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
La présente invention concerne un rotor comprenant : un arbre disposé le long d'un axe central s'étendant dans une direction ; un noyau de rotor fixé à l'arbre ; un aimant placé sur l'extérieur du noyau de rotor, dans le sens radial ; un couvercle de rotor présentant une section cylindrique qui entoure le noyau de rotor et l'aimant, placé sur l'extérieur de l'aimant dans le sens radial ; et une section de résine dont au moins une partie est placée sur l'intérieur du couvercle de rotor dans le sens radial. Le noyau de rotor comprend un trou traversant de noyau qui pénètre dans ce dernier dans le sens axial. Le couvercle de rotor comporte : une section bride qui fait saillie radialement vers l'intérieur à partir de la section cylindrique ; et une section crochet qui fait saillie à partir de la section bride dans le sens axial. La section de résine comprend : une première section couvercle placée sur un côté du noyau de rotor, de l'aimant et de la section bride, dans le sens axial ; une seconde section couvercle placée sur l'autre côté du noyau de rotor et de l'aimant, dans le sens axial ; et une première section d'accouplement qui s'étend dans le sens axial à travers le trou traversant de noyau et qui relie la première section couvercle et la seconde section couvercle. La section crochet est accrochée au noyau de rotor ou à la section de résine.The present invention relates to a rotor comprising: a shaft disposed along a central axis extending in one direction; a rotor core attached to the shaft; a magnet placed on the outside of the rotor core in the radial direction; a rotor cover having a cylindrical section which surrounds the rotor core and the magnet, placed on the outside of the magnet in the radial direction; and a resin section of which at least a portion is placed on the inside of the rotor cover in the radial direction. The rotor core includes a core through hole that penetrates the core axially. The rotor cover comprises: a flange section which protrudes radially inwardly from the cylindrical section; and a hook section which protrudes from the flange section in the axial direction. The resin section comprises: a first cover section placed on one side of the rotor core, the magnet and the flange section, in the axial direction; a second cover section placed on the other side of the rotor core and the magnet, in the axial direction; and a first coupling section which extends axially through the core through hole and connects the first cover section and the second cover section. The hook section is hooked to the rotor core or the resin section.
Description
図1に示すように、本実施形態のモータ10は、ハウジング11と、ステータ12と、一方向に延びる中心軸Jに沿って配置されるシャフト20を備えるロータ13と、ベアリングホルダ14と、ベアリング15,16と、を備える。ステータ12は、ロータ13の径方向外側においてロータ13と径方向隙間を介して対向する。シャフト20は、ベアリング15,16に回転可能に支持される。シャフト20は、軸方向Zに延びる円柱状である。 First Embodiment
As shown in FIG. 1, the
As shown in FIGS. 2 and 5, at least a portion of the
The
図9に示すように、本変形例のロータ113において、ロータカバー160のカバー貫通孔162aは、周方向に延びる。カバー貫通孔162aの周方向の寸法は、マグネット40の周方向の寸法以上である。そのため、ロータカバー160の周方向の位置決め精度が比較的低い場合であっても、カバー貫通孔162aを軸方向Zに沿って視てマグネット40同士の間と重ねやすい。これにより、樹脂部50を上述したインサート成形によって作る際に、マグネット40同士の間に樹脂を流しやすくできる。 First Modification of First Embodiment
As shown in FIG. 9, in the
図10に示すように、本変形例のロータ213において、ロータカバー260のカバー貫通孔262aは、周方向に延びる。カバー貫通孔262aの周方向の寸法は、図9に示すカバー貫通孔162aの周方向の寸法よりも大きい。周方向に隣り合うカバー貫通孔262a同士の間に位置するフランジ部262の部分262bにおける周方向の寸法L2は、周方向に隣り合うマグネット40同士の間の周方向の距離L1よりも小さい。そのため、例えば、軸方向Zに沿って視て、部分262bが周方向に隣り合うマグネット40同士の間と重なる場合であっても、マグネット40同士の間の一部を、カバー貫通孔262aと重ねることができる。これにより、樹脂部50を上述したインサート成形によって作る際に、マグネット40同士の間に樹脂をより流しやすくできる。 Second Modification of First Embodiment
As shown in FIG. 10, in the
図11から図13に示すように、本実施形態のロータ313において、ロータカバー360は、延伸部363と、第2爪部364を有する。図11および図13に示すように、延伸部363は、フランジ部62の径方向内縁から径方向内側に延びる。延伸部363は、延びる向きが異なる点を除いて、第1実施形態の第1爪部63と同様である。延伸部363は、ロータコア本体31の下面に接触し、ロータコア30を下側から支持する。 Second Embodiment
As shown in FIGS. 11 to 13, in the
Claims (8)
- 一方向に延びる中心軸に沿って配置されるシャフトと、
前記シャフトに固定されるロータコアと、
前記ロータコアの径方向外側に位置するマグネットと、
前記マグネットの径方向外側において前記ロータコアおよび前記マグネットを囲む筒状部を有するロータカバーと、
少なくとも一部が前記ロータカバーの径方向内側に位置する樹脂部と、
を備え、
前記ロータコアは、前記ロータコアを軸方向に貫通するコア貫通孔を有し、
前記ロータカバーは、
前記筒状部から径方向内側に突出するフランジ部と、
前記フランジ部から軸方向に突出する爪部と、
を有し、
前記樹脂部は、
前記ロータコアと前記マグネットと前記フランジ部との軸方向一方側に位置する第1蓋部と、
前記ロータコアと前記マグネットとの軸方向他方側に位置する第2蓋部と、
前記コア貫通孔を通って軸方向に延び、前記第1蓋部と前記第2蓋部とを繋ぐ第1連結部と、
を有し、
前記爪部は、前記ロータコアまたは前記樹脂部に引っ掛けられる、ロータ。
A shaft disposed along a central axis extending in one direction;
A rotor core fixed to the shaft;
A magnet located radially outward of the rotor core;
A rotor cover having a cylindrical portion surrounding the rotor core and the magnet on the radially outer side of the magnet;
A resin portion at least a part of which is positioned radially inward of the rotor cover;
Equipped with
The rotor core has a core through hole axially penetrating the rotor core,
The rotor cover is
A flange portion that protrudes radially inward from the cylindrical portion;
Claws axially projecting from the flange;
Have
The resin part is
A first lid portion positioned on one side in the axial direction of the rotor core, the magnet, and the flange portion;
A second lid positioned on the other axial side of the rotor core and the magnet;
A first connecting portion extending axially through the core through hole and connecting the first lid and the second lid;
Have
The rotor is hooked to the rotor core or the resin portion.
- 前記ロータカバーは、前記爪部として、前記フランジ部から軸方向一方側に突出する第1爪部を有し、
前記第1爪部は、前記第1蓋部に埋め込まれる、請求項1に記載のロータ。
The rotor cover has, as the claw portion, a first claw portion projecting to one side in the axial direction from the flange portion,
The rotor according to claim 1, wherein the first claw portion is embedded in the first lid portion.
- 前記第1爪部は、前記フランジ部から軸方向に対して傾斜する方向に延びる、請求項2に記載のロータ。 The rotor according to claim 2, wherein the first claw portion extends in a direction inclining with respect to the axial direction from the flange portion.
- 前記ロータカバーは、前記爪部として、前記フランジ部から軸方向他方側に突出する第2爪部を有し、
前記第2爪部は、少なくとも一部が前記コア貫通孔内に位置する、請求項1から3のいずれか一項に記載のロータ。
The rotor cover has, as the claw portion, a second claw portion projecting to the other side in the axial direction from the flange portion,
The rotor according to any one of claims 1 to 3, wherein at least a part of the second claw portion is located in the core through hole.
- 前記ロータコアは、周方向に沿って一周に亘って並んで配置される複数の前記コア貫通孔を有し、
複数の前記コア貫通孔のうち一部の前記コア貫通孔は、前記第1連結部が通る第1コア貫通孔であり、
複数の前記コア貫通孔のうち他の一部の前記コア貫通孔は、軸方向に沿って視て前記第1連結部と異なる位置にある第2コア貫通孔であり、
前記第2コア貫通孔における軸方向両側の開口部のうちの少なくとも一方は、前記ロータの外部に露出し、
前記第2爪部は、少なくとも一部が前記第2コア貫通孔内に位置する、請求項4に記載のロータ。
The rotor core has a plurality of the core through holes arranged in a row along the circumferential direction.
Among the plurality of core through holes, a part of the core through holes is a first core through hole through which the first connection portion passes,
Another part of the core through holes among the plurality of core through holes is a second core through hole located at a position different from the first connecting portion as viewed in the axial direction,
At least one of the openings on both axial sides of the second core through hole is exposed to the outside of the rotor,
The rotor according to claim 4, wherein at least a part of the second claw portion is located in the second core through hole.
- 前記フランジ部は、前記フランジ部を軸方向に貫通するカバー貫通孔を有し、かつ、前記ロータコアの軸方向一方側に位置し、
前記樹脂部は、前記カバー貫通孔を通って軸方向に延び、前記第1蓋部と前記第2蓋部とを繋ぐ第2連結部を有する、請求項1から5のいずれか一項に記載のロータ。
The flange portion has a cover through hole axially penetrating the flange portion, and is located on one side of the rotor core in the axial direction.
The said resin part is an axial direction through the said cover through-hole, and has a 2nd connection part which connects a said 1st cover part and a said 2nd cover part, It is described in any one of Claim 1 to 5 The rotor of
- 周方向に沿って互いに間隔を空けて配置される複数の前記マグネットを備え、
前記第2連結部は、周方向に隣り合う前記マグネット同士の間を通る、請求項6に記載のロータ。
A plurality of the magnets spaced apart from one another along a circumferential direction,
The rotor according to claim 6, wherein the second connection portion passes between the magnets adjacent in the circumferential direction.
- 請求項1から7のいずれか一項に記載のロータと、
前記ロータと径方向に隙間を介して対向するステータと、
を備える、モータ。 A rotor according to any one of the preceding claims.
A stator that faces the rotor in the radial direction via a gap;
Equipped with a motor.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017-127509 | 2017-06-29 | ||
JP2017127509 | 2017-06-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2019003801A1 true WO2019003801A1 (en) | 2019-01-03 |
Family
ID=64741302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2018/021170 WO2019003801A1 (en) | 2017-06-29 | 2018-06-01 | Rotor and motor |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2019003801A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113315332A (en) * | 2020-02-27 | 2021-08-27 | 精工爱普生株式会社 | Axial gap motor |
CN114977708A (en) * | 2021-02-24 | 2022-08-30 | 日本电产株式会社 | Rotor, rotating electric machine, and drive device |
WO2023162997A1 (en) * | 2022-02-28 | 2023-08-31 | ニデック株式会社 | Rotor, rotor manufacturing device, and rotor manufacturing method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01270756A (en) * | 1988-04-20 | 1989-10-30 | Aichi Emerson Electric Co Ltd | Permanent magnet type rotor |
JP2010206939A (en) * | 2009-03-03 | 2010-09-16 | Nsk Ltd | Rotor for brushless motor, brushless motor, electric power steering apparatus, and method of manufacturing the rotor for brushless motor |
JP2016067190A (en) * | 2014-04-14 | 2016-04-28 | アスモ株式会社 | Rotor structure for liquid pump |
-
2018
- 2018-06-01 WO PCT/JP2018/021170 patent/WO2019003801A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01270756A (en) * | 1988-04-20 | 1989-10-30 | Aichi Emerson Electric Co Ltd | Permanent magnet type rotor |
JP2010206939A (en) * | 2009-03-03 | 2010-09-16 | Nsk Ltd | Rotor for brushless motor, brushless motor, electric power steering apparatus, and method of manufacturing the rotor for brushless motor |
JP2016067190A (en) * | 2014-04-14 | 2016-04-28 | アスモ株式会社 | Rotor structure for liquid pump |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113315332A (en) * | 2020-02-27 | 2021-08-27 | 精工爱普生株式会社 | Axial gap motor |
CN114977708A (en) * | 2021-02-24 | 2022-08-30 | 日本电产株式会社 | Rotor, rotating electric machine, and drive device |
WO2023162997A1 (en) * | 2022-02-28 | 2023-08-31 | ニデック株式会社 | Rotor, rotor manufacturing device, and rotor manufacturing method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6429115B2 (en) | motor | |
WO2018180924A1 (en) | Rotor and motor | |
JP2016163408A (en) | Motor | |
WO2019003801A1 (en) | Rotor and motor | |
US9557564B2 (en) | Rotary body driving apparatus | |
WO2016174894A1 (en) | Motor | |
CN212063658U (en) | Rotor and motor | |
US10530218B2 (en) | Vibration motor | |
JP6925818B2 (en) | Motor rotors, motors, and pumping equipment | |
WO2019003800A1 (en) | Rotor and motor | |
JP6981959B2 (en) | Magnetic wheel for electric motors | |
JP2017225332A (en) | Motor and rotary assembly thereof | |
KR102622136B1 (en) | motor with types of segmented rotor | |
JP5177359B2 (en) | Axial air gap type electric motor | |
JP2018033307A (en) | motor | |
KR101560055B1 (en) | Rotor for Motor | |
WO2018123840A1 (en) | Rotor and motor | |
JP2015216707A (en) | Motor and manufacturing method for motor | |
JP2018137964A (en) | Motor, and motor manufacturing method | |
JP2009290915A (en) | Motor | |
JP2019062688A (en) | motor | |
US11289963B2 (en) | Rotor, motor, and electric power steering device | |
JP6816546B2 (en) | Motors and motor manufacturing methods | |
JP6493250B2 (en) | Motor assembly jig and motor assembly method | |
JPWO2019111879A1 (en) | Gear system with motor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18823638 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 18823638 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: JP |