WO2019003802A1 - ロータ、モータおよびロータの製造方法 - Google Patents

ロータ、モータおよびロータの製造方法 Download PDF

Info

Publication number
WO2019003802A1
WO2019003802A1 PCT/JP2018/021172 JP2018021172W WO2019003802A1 WO 2019003802 A1 WO2019003802 A1 WO 2019003802A1 JP 2018021172 W JP2018021172 W JP 2018021172W WO 2019003802 A1 WO2019003802 A1 WO 2019003802A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
rotor core
convex portion
end cap
magnet
Prior art date
Application number
PCT/JP2018/021172
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
真郷 青野
貴之 右田
晃弘 大北
Original Assignee
日本電産株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN201890000952.5U priority Critical patent/CN212063658U/zh
Publication of WO2019003802A1 publication Critical patent/WO2019003802A1/ja

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
    • H02K1/27—Rotor cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets

Definitions

  • the present invention relates to a rotor, a motor and a method of manufacturing the rotor.
  • 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. U.S. Pat. No. 5,075,015).
  • the present invention provides a rotor having a rotor cover and a magnet on a rotor cover without using an adhesive and suppressing rattling, a motor including such a rotor, and a method of manufacturing the 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 the vertical direction, a rotor core fixed to the shaft, and a plurality of radial outer sides of the rotor core and arranged along the circumferential direction
  • a rotor cover having a magnet, a cylindrical portion surrounding the rotor core and the magnet from the radially outer side of the magnet, and a bottom portion positioned at an opening on the lower side of the cylindrical portion; and a position above the rotor core and the magnet
  • 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.
  • FIG. 1 is a schematic cross-sectional view of a motor according to an embodiment.
  • FIG. 2 is an exploded perspective view of the rotor of an embodiment.
  • FIG. 3 is a cross-sectional view of the rotor of one embodiment.
  • FIG. 4 is a perspective view of an end cap of one embodiment.
  • FIG. 5 is a perspective view for describing a part of a second step in the process of manufacturing a rotor according to an embodiment.
  • FIG. 6 is a perspective view for explaining a part of a second step in the process of manufacturing a rotor according to an embodiment.
  • FIG. 7 is a perspective view for explaining a part of a second step in the process of manufacturing a rotor according to an embodiment.
  • FIG. 8 is a cross-sectional view of a rotor of a modification.
  • FIG. 9 is a perspective view of a modified end cap.
  • FIG. 1 is a schematic cross-sectional view of a motor 10 according to the present embodiment.
  • the motor 10 includes a housing 11, a stator 12, a rotor 13 having a shaft 20 disposed along a vertically extending central axis J, a bearing holder 14, and bearings 15 and 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.
  • the Z axis is shown as appropriate.
  • the Z-axis direction of each drawing is a direction parallel to the axial direction of the central axis J shown in FIG.
  • the positive side in the Z-axis direction (+ Z side, one side) is referred to as “upper side”
  • the negative side in the Z-axis direction ( ⁇ Z side, other side) as “lower side”.
  • the upper and lower sides are directions used merely for the purpose of explanation, and do not limit the actual positional relationship or direction.
  • a direction (Z-axis direction) parallel to the central axis J is simply referred to as “axial direction” or “vertical direction”, and a radial direction centered on the central axis J is simply referred to as “radial direction”.
  • the circumferential direction around the central axis J that is, around the axis of the central axis J, is simply referred to as “circumferential direction”.
  • plane view means a state viewed from the axial direction.
  • a scale, the number, etc. in an actual structure and each structure may be varied.
  • FIG. 2 is an exploded perspective view of the rotor 13.
  • FIG. 3 is a cross-sectional view of the rotor 13. In FIG. 2, the illustration of the shaft 20 is omitted.
  • the rotor 13 includes a shaft 20 (see FIG. 4), a rotor core 30, a plurality of magnets 40, a rotor cover 60, and an end cap 50.
  • the rotor core 30 is in the form of an axially extending column.
  • the rotor core 30 is configured, for example, by laminating a plurality of plate members in the axial direction.
  • the rotor core 30 has a rotor core main body 31 and a plurality of projections 33 located on the outer peripheral surface of the rotor core main body 31.
  • the rotor core body 31 extends in the axial direction. 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.
  • the magnet support surface 32 is a flat surface orthogonal to the radial direction.
  • the plurality of magnet support surfaces 32 form a plurality of radially outer side surfaces of the rotor core main body 31 having a regular octagonal columnar shape.
  • the rotor core main body 31 has a fixing hole 31 a penetrating the rotor core main body 31 in the axial direction.
  • the shape viewed along the axial direction of the fixing hole portion 31 a 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 dimension in the circumferential direction of the protrusion 33 increases from the radially inner side toward the radially outer side.
  • 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 is provided with a plurality of core through holes (recesses) 34 penetrating the rotor core 30 in the axial direction.
  • the core through hole 34 penetrates the rotor core main body 31 in the axial direction.
  • the plurality of core through holes 34 are arranged at equal intervals 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 holes 34 are circular when viewed along the axial direction.
  • the number of core through holes 34 is, for example, eight.
  • Each core through hole 34 is located radially inward of the different magnets 40.
  • the magnet 40 has a substantially square prism shape that is flat in the radial direction and extends in the axial direction.
  • the magnet 40 is located radially outward of the rotor core 30.
  • the plurality of magnets 40 are arranged along the circumferential direction. More specifically, the plurality of magnets 40 are arranged at equal intervals along the circumferential direction.
  • Each magnet 40 is arrange
  • 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.
  • the magnet 40 is positioned in the circumferential direction by contacting the protrusion 33.
  • Each magnet 40 is supported by the magnet support surface 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 axial design dimension of the magnet 40 is the same as the axial design dimension of the rotor core 30.
  • the upper surface 40 a of the magnet 40 and the upper surface 30 a of the rotor core 30 are disposed on substantially the same plane orthogonal to the axial direction.
  • the lower surface 40 b of the magnet 40 and the lower surface 30 b of the rotor core 30 are disposed on substantially the same plane orthogonal to the axial direction.
  • the rotor cover 60 has a cylindrical portion 61 and a bottom portion 62.
  • the rotor cover 60 is made of a metal material.
  • the cylindrical portion 61 has a tubular shape extending in the axial direction. 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.
  • the cylindrical portion 61 surrounds the rotor core 30 and the magnet 40 from the radially outer side of the magnet.
  • the upper end portion 61 c of the cylindrical portion 61 is provided with an inner protruding portion 63 extending inward in the radial direction.
  • the inner projecting portion 63 is formed by plastically deforming the upper end portion 61c (see FIG. 2) of the cylindrical portion 61 linearly extending along the axial direction (see FIG. 2) radially inward.
  • the inner projection 63 contacts the upper surface 50 a of the end cap 50.
  • the inner protrusion 63 presses the end cap 50 against the rotor core 30 and the magnet 40 to fix the end cap 50 to the cylindrical portion 61.
  • the inner protrusion 63 is provided with a fixing projection 64 described later with reference to FIG.
  • the fixing recess 55 d fits into the fixing recess 55 d of the end cap 50 to suppress the rotation of the end cap 50 with respect to the rotor cover 60.
  • the bottom portion 62 is located at the lower opening 61 b of the cylindrical portion.
  • the bottom portion 62 extends radially inward from the cylindrical portion 61.
  • the bottom portion 62 is provided with a shaft passage hole 62c.
  • the plan view shape of the shaft passing hole 62c is a circle centered on the central axis J.
  • the diameter of the shaft passage hole 62 c is larger than the diameter of the shaft 20.
  • the shaft 20 is passed through the shaft passage hole 62c.
  • the bottom portion 62 is located below the rotor core 30 and the plurality of magnets 40.
  • the lower surface 30 b of the rotor core 30 and the lower surfaces 40 b of the plurality of magnets 40 are in contact with the upper surface 62 a of the bottom portion 62.
  • the rotor core 30 and the plurality of magnets 40 are supported by the bottom portion 62 from the lower side.
  • the end cap 50 is located on the upper side of the rotor core 30 and the magnet 40 and covers the rotor core 30 and the magnet 40 from the upper side.
  • the end cap 50 is located radially inward of the cylindrical portion 61.
  • the end cap 50 is housed in the rotor cover 60.
  • the end cap 50 is made of, for example, a resin material.
  • FIG. 4 is a perspective view of the end cap 50.
  • the end cap 50 includes a disk-shaped plate-like portion 55, a plurality of (four in the present embodiment) first convex portions 51, a plurality of second convex portions 52, and a plurality (two in the present embodiment) And the third convex portion 53).
  • the first convex portion 51, the second convex portion 52 and the third convex portion 53 are provided on the lower surface 55 b of the plate-like portion 55.
  • the plate-like portion 55 extends in the direction orthogonal to the central axis J.
  • the outer shape in plan view of the plate-like portion 55 is circular.
  • the outer diameter of the plate-like portion 55 is slightly smaller than the inner diameter of the cylindrical portion 61.
  • the outer peripheral edge of the plate-like portion 55 is located inside the cylindrical portion 61.
  • the plate-like portion 55 is provided with a shaft passing hole 55c.
  • the plan view shape of the shaft passage hole 55c is a circle whose center is the central axis J.
  • the diameter of the shaft passage hole 55 c is sufficiently larger than the diameter of the shaft 20.
  • the shaft 20 is passed through the shaft passage hole 55c.
  • the first convex portion 51, the second convex portion 52, and the third convex portion 53 protrude downward from the plate-like portion 55.
  • the first convex portion 51, the second convex portion 52, and the third convex portion 53 are disposed around the central axis J, respectively. That is, the first convex portion 51, the second convex portion 52, and the third convex portion 53 are disposed on an imaginary circle centered on the central axis J in plan view.
  • the second convex portion 52 is the longest
  • the first convex portion 51 is the second longest
  • the third convex portion 53 is the shortest.
  • the plurality of first protrusions 51 are arranged at equal intervals around the central axis J.
  • the plurality of first convex portions 51 overlap the rotor core 30 as viewed from the axial direction.
  • the planar view shape of each 1st convex part 51 is circular.
  • the tip of the first convex portion 51 is curved in a hemispherical shape.
  • the state of the single component before the end cap 50 is assembled to the rotor 13 is simply referred to as the "component state”. Further, the state after the end cap 50 is assembled to the rotor 13 is simply referred to as "assembled state”.
  • the first convex portion 51 is in contact with the upper surface 30 a of the rotor core 30.
  • the first convex portion 51 is plastically deformed in accordance with the surface shape of the upper surface 30 a of the rotor core 30.
  • the end cap 50 is pressed to the rotor core 30 and the magnet 40 by the inner protruding portion 63 of the rotor cover 60.
  • the first convex portion 51 is elastically deformed in the axial direction to generate a repulsive force between the inner protruding portion 63 and the rotor core 30.
  • the axial length (protruding dimension h1) in the component state of the first convex portion 51 is longer than the distance between the lower surface 55b of the plate-like portion 55 and the upper surface 30a of the rotor core 30 in the assembled state. Therefore, the first convex portion 51 deforms and reliably contacts the upper surface 30 a of the rotor core 30.
  • the second convex portion 52 extends annularly along the circumferential direction.
  • the lower surface 52 b of the second convex portion 52 overlaps with each of the plurality of magnets 40 as viewed from the axial direction.
  • the second convex portion 52 contacts the upper surface 40 a of the magnet 40 at the lower surface 52 b.
  • the lower surface 52 b of the second convex portion 52 is located outside the outer peripheral edge of the rotor core 30 as viewed in the axial direction. Therefore, the second convex portion 52 does not contact the upper surface 30 a of the rotor core 30.
  • the height of the component state of the second convex portion 52 substantially matches the distance between the lower surface 55 b of the plate-like portion 55 and the upper surface 30 a of the rotor core 30 in the assembled state. That is, the second convex portion 52 hardly deforms before and after assembly. In other words, the protrusion dimension h2 of the second protrusion 52 hardly changes before and after the assembly. Therefore, the projection dimension h2 of the second convex portion 52 is a reference dimension that determines the distance between the lower surface 55b of the plate-like portion 55 and the upper surface 30a of the rotor core 30 in the assembled state.
  • the “projecting dimension” means the axial distance from the lower surface 55 b of the plate-like portion 55 to the tip of the convex portion.
  • the protrusion dimension h1 of the first protrusion 51 is larger than the protrusion dimension h2 of the second protrusion 52. Further, in the assembled state, the protrusion dimension h1a of the first protrusion 51 matches the protrusion dimension h2 of the second protrusion 52. In other words, the first convex portion 51 is deformed to have substantially the same height as the second convex portion 52 in the assembling process.
  • the first convex portion 51 and the second convex portion 52 individually project from the plate-like portion 55, it is difficult for one deformation to affect the other. Therefore, at least one of the first convex portion 51 and the second convex portion 52 is deformed to press the upper surfaces 30a and 40a of the rotor core 30 and the magnet 40 from the upper side to the lower side to move the rotor core 30 and the magnet 40 in the axial direction. It can suppress the occurrence of rattling.
  • the plurality of first protrusions 51 are arranged at equal intervals around the central axis J.
  • the second convex portion 52 extends annularly around the central axis J. Therefore, the first convex portion 51 is easily deformed relative to the second convex portion 52, and the first convex portion 51 can be deformed based on the protrusion dimension h2 of the second convex portion 52.
  • the axial dimension may vary. If it is attempted to press the rotor core and the magnet on the same surface of the end cap, a gap may be generated between one of the rotor core 30 and the magnet 40 and the end cap, which may cause rattling.
  • the projection dimension h1 of the first projection 51 is larger than the projection dimension h2 of the second projection 52, the first projection 52 is a first contact with the magnet 40 as a reference. Can be deformed until it sufficiently contacts the magnet 40.
  • the first convex portion 51 can be in contact with the upper surface 30 a of the rotor core 30 without a gap
  • the second convex portion 52 can be in contact with the upper surface 40 a of the magnet 40 without a gap.
  • the end cap 50 can press and fix the rotor core 30 and the magnet 40 simultaneously to the bottom 62 of the rotor cover 60.
  • the protrusion dimension of any one of the 1st convex part 51 and the 2nd convex part 52 is larger than the protrusion size of the other, rattling of the rotor core 30 and the magnet 40 can be suppressed. That is, one of the larger projecting dimensions can be plastically or elastically deformed until the other contacts the upper surface of the opposing rotor core 30 or magnet 40. Thereby, the first convex portion 51 and the second convex portion 52 can be brought into contact with the rotor core 30 and the magnet 40 without any gap, and rattling of the rotor core 30 and the magnet 40 can be suppressed.
  • the first convex portion 51 and the second convex portion 52 are disposed around the central axis J. More specifically, the plurality of first protrusions 51 are arranged at equal intervals around the central axis J, and the second protrusions 52 are annularly arranged around the central axis J. For this reason, the end cap 50 applies a force to the rotor core 30 and the plurality of magnets 40 uniformly in the circumferential direction with respect to the central axis J via the first convex portion 51 and the second convex portion 52. Can. As a result, the rotor core 30 and the plurality of magnets 40 can be pressed to the bottom 62 in a balanced manner, and the rotor core 30 and the plurality of magnets 40 can be stably fixed to the rotor cover 60.
  • the second convex portion 52 is provided annularly around the central axis J.
  • the end cap 50 of this embodiment is made of a resin material and manufactured by injection molding.
  • the lower surface 52 b of the second convex portion 52 can be formed as a surface derived from the same surface in the mold, and the dimensional accuracy of the lower surface 52 b can be enhanced. it can.
  • the protrusion dimension h2 of the second convex portion 52 is a reference dimension that determines the distance between the lower surface 55b of the plate-like portion 55 and the upper surface 30a of the rotor core 30 in the assembled state.
  • the dimensional accuracy of the lower surface 52 b of the second convex portion 52 can be enhanced, and as a result, the axial direction of the rotor 13 is obtained.
  • the plurality of third protrusions 53 are arranged at equal intervals around the central axis J.
  • the plan view shape of the third convex portion 53 is circular.
  • the protrusion dimension of the third protrusion 53 is larger than the protrusion dimension of the first protrusion 51 and the second protrusion 52.
  • the third convex portion 53 is inserted into the core through hole (concave portion) 34 of the rotor core 30.
  • the circumferential position of the end cap 50 can be positioned with respect to the rotor core 30.
  • the 2nd 3rd convex part 53 is provided in the edge part cap 50 of this embodiment, one or more 3rd convex parts 53 should just be provided.
  • the recess of the rotor core 30 into which the third protrusion 53 is inserted may not be the core through hole 34 penetrating the rotor core 30, as long as the recess is a shape that is recessed downward from the upper surface 30a.
  • the core through hole 34 is an aspect of the recess provided on the upper surface 30 a of the rotor core 30.
  • the rotor core 30 and the plurality of magnets 40 are accommodated inside the cylindrical portion 61 of the rotor cover 60. Thereby, the lower surface 30b of the rotor core 30 and the lower surfaces 40b of the plurality of magnets 40 are brought into contact with the bottom portion 62 of the rotor cover 60 (see FIG. 3).
  • 5 to 7 are perspective views for explaining the second step in the manufacturing process of the rotor 13.
  • the end cap 50 is disposed on the inner side of the cylindrical portion 61 and above the rotor core 30 and the plurality of magnets 40. At this time, the third convex portion 53 of the end cap 50 is inserted into the core through hole 34 of the rotor core 30. Further, the end cap 50 is pressed downward by using a jig (not shown). Thus, the first convex portion 51 of the end cap 50 is plastically deformed (see FIG. 3).
  • a plurality of (four in the present embodiment) fixing recesses 55 d are provided on the outer peripheral edge of the end cap 50.
  • the fixing recess 55d is recessed radially inward.
  • the fixing recess 55d is recessed downward from the upper surface 50a.
  • the four fixed recesses 55d are arranged at equal intervals around the central axis J.
  • the upper end portion 61 c of the cylindrical portion 61 is plastically deformed inward in the radial direction to form the inner protruding portion 63.
  • the inner projecting portion 63 is formed by pressing the upper end portion 61c from outside in the radial direction against the rotor cover 60 while pressing a caulking jig (not shown) around the central axis J, and bending the upper end portion 61c inward. Be done.
  • the inner protrusion 63 may be formed by lowering a die (not shown) relative to the upper end 61 c of the rotor cover 60 and pressing the upper end 61 c of the cylindrical portion 61 radially inward.
  • the inner protrusion 63 contacts the outer peripheral edge of the upper surface 50 a of the end cap 50.
  • the inner protrusion 63 presses the end cap 50 against the rotor core 30 and the magnet 40. More specifically, as shown in FIG. 3, the inner protrusion 63 brings the second protrusion 52 into contact with the upper surfaces 40 a of the plurality of magnets 40 and elastically deforms the first protrusion 51, while the upper surface of the rotor core 30 is Contact 30a.
  • the first convex portion 51 is elastically deformed and the repulsive force of the first convex portion 51 causes the end cap 50 to be attached to the rotor cover 60. It is fixed.
  • the second convex portion 52 may also be elastically deformed along with the first convex portion 51.
  • the second step of fixing the end cap 50 to the cylindrical portion 61 includes the step of deforming the first convex portion 51. Therefore, it is possible to provide the rotor 13 in which the rattling of the rotor core 30 and the magnet 40 is suppressed by bringing the first convex portion 51 and the second convex portion of the end cap into contact with the rotor core 30 and the magnet 40, respectively.
  • the process of plastically deforming the first protrusion 51 and the process of caulking the inner protrusion 63 and elastically deforming the first protrusion 51 are separately performed. did. However, these steps may be performed simultaneously. That is, when the inner protrusion 63 is formed by caulking, the first protrusion 51 may be plastically and elastically deformed. Further, in the present embodiment, only the first convex portion 51 is deformed in the second step, but the first convex portion 51 is brought into contact with the upper surface 30 a of the rotor core 30 and the second convex portion 52 is made of the magnet 40. The step of deforming one or both of the first convex portion 51 and the second convex portion 52 may be used as long as the upper surface 40 a of the second convex portion 52 is in contact with the upper surface 40 a.
  • the second step includes the step of deforming the upper end portion 61 c of the cylindrical portion 61 to provide the inner protruding portion 63.
  • the inner projection 63 can be brought into contact with the upper surface 50 a of the end cap 50, and the end cap 50 can be pressed against the rotor core 30 and the magnet 40 to fix the end cap 50.
  • the fixing convex portion 64 protrudes downward as well as dents the upper surface of the inner protruding portion 63 downward. More specifically, the fixed convex portion 64 is formed by striking a jig (not shown) from the upper side to the inner protruding portion 63 to deform.
  • the fixing projection 64 is fitted in a fixing recess 55 d provided on the outer peripheral edge of the end cap 50.
  • the second step includes the step of deforming the cylindrical portion 61 to provide the fixing projection 64.
  • the fixing convex portion 64 positions the end cap 50 in the circumferential direction with respect to the cylindrical portion 61 in order to fit in the fixing concave portion 55 d. Thereby, even if vibration occurs, the rotation of the end cap 50 is suppressed, and the first convex portion 51 and the second convex portion 52 move relative to the rotor core 30 and the magnet 40. There is no Therefore, since the first convex portion 51 and the second convex portion 52 are in stable contact with the rotor core 30 and the magnet 40, the rotor core 30 and the magnet 40 can be stably fixed to the rotor cover 60.
  • the step of caulking the inner protrusion 63 and the step of forming the fixing projection 64 may be performed in the same step.
  • the method of manufacturing the rotor 13 of this embodiment it is possible to manufacture the rotor 13 in which the rotor core 30 and the magnet 40 are fixed to the rotor cover 60 without using an adhesive and suppressing rattling. Therefore, according to this embodiment, the inexpensive and high-performance rotor 13 can be provided.
  • FIG. 8 is a cross-sectional view of a rotor 113 of a modification of the above-described embodiment.
  • FIG. 9 is a perspective view of an end cap 150 of a rotor 113 of a modification.
  • the rotor 113 of this modification mainly differs from the above-described rotor 13 in the structure of the end cap 150.
  • symbol is attached
  • the end cap 150 of the rotor 113 is pressed against the rotor core 30 and the magnet by the inner projecting portion 63 provided on the upper end portion 61 c of the cylindrical portion 61. And fixed to the tubular portion 61.
  • the end cap 150 includes a disk-shaped plate-like portion 155, a first convex portion 151, a plurality (eight in this modification) of a second convex portion 152, and a plurality (two) In the modification, two third convex portions 153 are provided.
  • the plate-like portion 155 extends in a direction perpendicular to the central axis J.
  • the outer shape of the plate-like portion 155 in a plan view is a circular shape slightly smaller than the inner diameter of the cylindrical portion 61.
  • the plate-like portion 155 is provided with a shaft passage hole 155 c through which the shaft 20 passes.
  • the first convex portion 151 protrudes downward from the lower surface 155 b of the plate-like portion 155.
  • the first convex portion 151 is disposed around the central axis J. More specifically, the first convex portion 151 extends annularly along the circumferential direction around the central axis J.
  • the first protrusions 151 overlap the rotor core 30 as viewed in the axial direction.
  • the first convex portion 151 contacts the upper surface 30 a of the rotor core 30 at the lower surface 151 b.
  • the height of the component state of the first convex portion 151 substantially matches the distance between the lower surface 155 b of the plate-like portion 155 and the upper surface 30 a of the rotor core 30 in the assembled state. That is, the first convex portion 151 hardly deforms before and after assembly, and the protrusion dimension h101 of the first convex portion 151 does not change before and after assembly. Therefore, the protrusion dimension h101 of the first convex portion 151 is a reference dimension that determines the distance between the lower surface 155b of the plate-like portion 155 and the upper surface 30a of the rotor core 30 in the assembled state.
  • the plurality of second projections 152 are arranged at equal intervals around the central axis J.
  • Each of the plurality of second convex portions 152 overlaps the different magnet 40 among the plurality of magnets 40 when viewed in the axial direction. That is, in the present modification, the end cap 150 has eight second convex portions 152 equal in number to the magnet 40, and the respective second convex portions 152 axially face the different magnets 40.
  • the plan view shape of each second convex portion 152 is circular.
  • the tip of the second protrusion 152 is hemispherically curved.
  • each of the second protrusions 152 contacts the top surface 40 a of a different magnet 40.
  • the second convex portion 152 is plastically deformed in accordance with the surface shape of the upper surface 40 a of the magnet 40.
  • the protrusion dimension h102 in the component state of the second convex portion 152 is longer than the distance between the lower surface 155b of the plate-like portion 155 and the upper surface 40a of the magnet 40 in the assembled state. Therefore, the second convex portion 152 is deformed and reliably contacts the upper surface 40 a of the magnet 40.
  • the protrusion dimension h102 of the second protrusion 152 is larger than the protrusion dimension h101 of the first protrusion 151. Further, in the assembled state, the protrusion dimension h102a of the second protrusion 152 matches the protrusion dimension h101 of the first protrusion 151. In other words, the second convex portion 152 is deformed to have substantially the same height as the first convex portion 151 in the assembling process.
  • the first convex portion 151 and the second convex portion 152 individually project from the plate-like portion 155, one deformation affects the other. Hard to give. Therefore, at least one of the first convex portion 151 and the second convex portion 152 is deformed to press the upper surfaces 30a and 40a of the rotor core 30 and the magnet 40 from the upper side to the lower side, and the axial direction of the rotor core 30 and the magnet 40 It can suppress the occurrence of rattling.
  • the plurality of second convex portions 152 contact the upper surfaces 40 a of the magnets 40 different from each other.
  • the plurality of magnets 40 may have variations in axial dimensions.
  • the second convex portions 152 individually contact the upper surface 40 a of the magnet 40 and deform according to the size of the magnet 40. For this reason, it is possible to suppress the rattling of the magnet 40 by absorbing the dimensional variations of the respective magnets 40 by the deformation of the respective second convex portions 152.
  • the plurality of third convex portions 153 are arranged at equal intervals around the central axis J.
  • the third convex portion 153 protrudes downward from the lower surface 151 b of the first convex portion 151.
  • the third convex portion 153 is inserted into the core through hole 34 of the rotor core 30 as in the above-described embodiment.
  • the circumferential position of the end cap 150 can be positioned with respect to the rotor core 30.
  • the plurality of second projections 152 can be reliably brought into contact with the different magnets 40.
  • the application of the motor provided with the rotor of the embodiment described above and its variation is not particularly limited.
  • the motor including the rotors of the above-described embodiment and the modification thereof is mounted on, for example, an electric pump, an electric power steering, and the like.
  • the 1st convex part 51 (or the 2nd convex part 152) carries out plastic deformation and elastic deformation.
  • the first convex portion 51 (or the second convex portion 152) may absorb the axial difference between the rotor core 30 and the magnet 40 only by elastic deformation without plastic deformation.
  • the shape of the 1st convex part 51 is an example.
  • the first convex portion 51 (or the second convex portion 152) may have another shape such as a conical shape which is easily deformed plastically and elastically.
  • the shaft 20 is not limited to a solid, and may be a hollow member.
  • the number of magnets 40 is eight (ie, the number of poles is eight).
  • the number of magnetic poles of the rotor may be changed as appropriate.
  • the shape of the magnet 40 is not limited to the one described above, and may be another shape.
  • the rotor core body 31 is not limited to the octagonal prismatic shape, and may be a polygonal pillar or a cylindrical shape depending on 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
PCT/JP2018/021172 2017-06-29 2018-06-01 ロータ、モータおよびロータの製造方法 WO2019003802A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201890000952.5U CN212063658U (zh) 2017-06-29 2018-06-01 转子和马达

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017127841 2017-06-29
JP2017-127841 2017-06-29

Publications (1)

Publication Number Publication Date
WO2019003802A1 true WO2019003802A1 (ja) 2019-01-03

Family

ID=64740560

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/021172 WO2019003802A1 (ja) 2017-06-29 2018-06-01 ロータ、モータおよびロータの製造方法

Country Status (2)

Country Link
CN (1) CN212063658U (zh)
WO (1) WO2019003802A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021182834A (ja) * 2020-05-20 2021-11-25 株式会社ミツバ ロータ、モータ、及び、ロータの製造方法
WO2024079930A1 (ja) * 2022-10-13 2024-04-18 株式会社ミツバ ブラシレスモータおよびロータの製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000014859A1 (en) * 1998-09-02 2000-03-16 Empresa Brasileira De Compressores S.A. - Embraco An electric motor rotor and a process for producing an electric motor rotor
JP2003143786A (ja) * 2001-11-01 2003-05-16 Mitsubishi Electric Corp 永久磁石式回転子及びその製造方法
JP2009038930A (ja) * 2007-08-03 2009-02-19 Daikin Ind Ltd ロータ及び埋込磁石型モータ
JP2016034216A (ja) * 2014-07-31 2016-03-10 アスモ株式会社 ロータ及びモータ
JP2016092858A (ja) * 2014-10-29 2016-05-23 Ｋｙｂ株式会社 ロータ、ロータの製造方法及びロータを備える回転電機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000014859A1 (en) * 1998-09-02 2000-03-16 Empresa Brasileira De Compressores S.A. - Embraco An electric motor rotor and a process for producing an electric motor rotor
JP2003143786A (ja) * 2001-11-01 2003-05-16 Mitsubishi Electric Corp 永久磁石式回転子及びその製造方法
JP2009038930A (ja) * 2007-08-03 2009-02-19 Daikin Ind Ltd ロータ及び埋込磁石型モータ
JP2016034216A (ja) * 2014-07-31 2016-03-10 アスモ株式会社 ロータ及びモータ
JP2016092858A (ja) * 2014-10-29 2016-05-23 Ｋｙｂ株式会社 ロータ、ロータの製造方法及びロータを備える回転電機

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021182834A (ja) * 2020-05-20 2021-11-25 株式会社ミツバ ロータ、モータ、及び、ロータの製造方法
WO2024079930A1 (ja) * 2022-10-13 2024-04-18 株式会社ミツバ ブラシレスモータおよびロータの製造方法

Also Published As

Publication number Publication date
CN212063658U (zh) 2020-12-01

Similar Documents

Publication Publication Date Title
JP4706339B2 (ja) アキシャルエアギャップ型電動機
WO2018180924A1 (ja) ロータ、およびモータ
JP5685506B2 (ja) 回転電機の回転子、回転電機および回転子の端面部材
CN110739787B (zh) 电机及其转子
WO2019003802A1 (ja) ロータ、モータおよびロータの製造方法
US11233433B2 (en) Rotor and motor
JP2017225337A (ja) モータ
WO2019003801A1 (ja) ロータ、およびモータ
WO2020067250A1 (ja) ステータ、モータおよびステータの製造方法
JP2019022301A (ja) モータ
JPWO2018062350A1 (ja) ロータユニット及びモータ
KR102622136B1 (ko) 회전자 분할형 모터
WO2019003800A1 (ja) ロータ、およびモータ
KR20140077556A (ko) 모터
JP6745674B2 (ja) ロータおよび回転電機
CN210839164U (zh) 马达
JP6354227B2 (ja) 回転電機の磁石固着方法、磁石固着用治具、回転電機
CN212412923U (zh) 马达
CN110858741A (zh) 马达
JP2020108299A (ja) ロータ、およびモータ
WO2018062349A1 (ja) ロータユニット、モータ、及びロータユニットの製造方法
JPWO2019021656A1 (ja) ステータ及びモータ
JP6972890B2 (ja) モータ、およびモータの製造方法
JP6816546B2 (ja) モータおよびモータの製造方法
US20010017953A1 (en) Bearing holding structure and motor having same

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: 18823285

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: 18823285

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP