CN110574258A - Motor with a stator having a stator core - Google Patents
Motor with a stator having a stator core Download PDFInfo
- Publication number
- CN110574258A CN110574258A CN201880022990.5A CN201880022990A CN110574258A CN 110574258 A CN110574258 A CN 110574258A CN 201880022990 A CN201880022990 A CN 201880022990A CN 110574258 A CN110574258 A CN 110574258A
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- CN
- China
- Prior art keywords
- magnet
- circumferential
- hole
- rotor
- axial direction
- Prior art date
- Legal status (The legal status 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 status listed.)
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Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 230000005291 magnetic effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims 1
- 230000004048 modification Effects 0.000 description 14
- 238000012986 modification Methods 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000012212 insulator Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
Abstract
The motor has a shaft, a rotor (10) fixed to the shaft, a stator located radially outside the rotor (10), and a housing that houses the rotor and the stator. A rotor (10) is provided with: a through hole (13) into which a shaft is inserted; a plurality of magnet-accommodating holes (15) which are provided at intervals in the circumferential direction on the peripheral edge of the rotor (10) and which penetrate in the axial direction; a plurality of magnets (17) inserted into the plurality of magnet receiving holes (15); and a fixing portion that is disposed at axial end portions on both sides of the rotor (10) in the axial direction and fixes the plurality of magnets (17) to the rotor (10). The magnet housing hole (15) has a pair of space hole sections (15c), and the pair of space hole sections (15c) extend further in the circumferential direction than the circumferential end sections (17b) of the magnet (17) inserted into the magnet housing hole (15). The fixing part (63) has: an annular plate section (65) that covers the plurality of magnet receiving holes (15); and a protruding section (67) that protrudes in the axial direction from a surface section (65a) of the plate section (65) that faces an axial end section of the rotor (10) to the inside of the space hole section (15c), and is disposed in the space hole section (15 c). The magnet (17) is in contact with a protrusion (67) disposed in the space hole (15c) and an inner surface (15d) of the magnet accommodating hole (15).
Description
Technical Field
the present invention relates to a motor.
Background
some motors include an IPM (interior permanent magnet) motor in which a magnet is embedded inside a rotor. In this IPM motor, the magnet is disposed inside the rotor, and therefore the possibility of the magnet falling off from the rotor can be prevented.
as described in patent document 1, the rotor of the IPM motor includes: a rotor core having a cylindrical shape and fixed to the shaft; a plurality of magnet accommodating holes that penetrate in the axial direction and are provided at intervals in the circumferential direction in the peripheral edge portion of the rotor core; and a plurality of magnets inserted into the plurality of magnet receiving holes, respectively.
The storage hole portion has: a hole body that houses a magnet; and space hole portions extending in the circumferential direction from both circumferential sides of the hole portion main body. The magnet has a size that generates a small gap in a radial direction with the hole body in a state of being inserted into the hole body. The magnets are held by clamps so as to be sandwiched from both sides in the axial direction of the rotor core, thereby positioning the magnets. The magnet after positioning is fixed to the rotor by solidifying a fixing solution such as a varnish solution that has penetrated between the housing hole and the magnet.
documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2017-38462
Disclosure of Invention
Problems to be solved by the invention
In the IPM motor described in patent document 1, a reference surface for positioning the magnet in the circumferential direction with respect to the magnet accommodating hole is not clear. Therefore, there are cases where: the relative position of each magnet inserted into the plurality of magnet receiving holes with respect to the magnet receiving holes is offset in the circumferential direction. In this case, the rotational speed of the rotor may fluctuate during driving of the rotor.
the present invention aims to provide a motor having a rotor capable of positioning a magnet in a circumferential direction with respect to a magnet accommodating hole.
Means for solving the problems
An exemplary 1 st invention of the present application is a motor including: a shaft disposed along a central axis extending in an axial direction; a rotor fixed to the shaft; a stator located radially outward of the rotor; and a housing that houses the rotor and the stator, the rotor having a cylindrical shape extending in an axial direction, the rotor including: a through hole extending in an axial direction and into which the shaft is inserted; a plurality of magnet accommodating holes that penetrate in the axial direction and are provided at the radially inner peripheral edge of the rotor at intervals in the circumferential direction; a plurality of magnets inserted into the plurality of magnet receiving holes, respectively; and a fixing portion that is disposed at axial end portions on both axial sides of the rotor and fixes the plurality of magnets to the rotor, wherein the magnet accommodating hole has a pair of space hole portions that extend further in a circumferential direction than circumferential end portions on both circumferential sides of the magnet inserted into the magnet accommodating hole, and the fixing portion includes: an annular plate portion that covers the plurality of magnet accommodating holes provided in the circumferential edge portion of the rotor in the circumferential direction; and a protruding portion that protrudes in the axial direction from a surface portion of the plate portion facing the axial end portion of the rotor toward an inner side of the space hole and is disposed in the space hole, wherein the magnet is in contact with the protruding portion that is press-fitted into the space hole on an inner surface of the magnet accommodating hole.
Effects of the invention
According to the first exemplary aspect of the present invention, a motor having a rotor capable of positioning a magnet in a circumferential direction with respect to a magnet accommodating hole can be provided.
Drawings
Fig. 1 is a sectional view of a motor of a first embodiment.
fig. 2 is a perspective view of the rotor.
Fig. 3 is a side view of the rotor.
Fig. 4 is a partially enlarged view of the magnet accommodating hole indicated by an arrow X in fig. 3.
Fig. 5 is a perspective view of a fixing portion for fixing the magnet to the rotor.
Fig. 6 shows a modification of the fixing portion, fig. 6A in fig. 6 is a partial side view of the rotor in which the protruding portion of the fixing portion is inserted into one circumferential side of the magnet accommodating hole, and fig. 6B in fig. 6 is a partial side view of the rotor in which the protruding portion is inserted into the opposed space hole portion of the circumferentially adjacent magnet accommodating hole.
Detailed Description
Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a DC motor used for a compressor for an electric power tool will be described. In the drawings below, in order to facilitate understanding of each structure, the actual structure may be different from each structure in scale, number, and the like.
in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional rectangular coordinate system. In the XYZ coordinate system, the Z-axis direction is a direction (vertical direction in fig. 1) parallel to the axial direction of the central axis J shown in fig. 1. The X-axis direction is a direction parallel to the radial direction of the motor shown in fig. 1, i.e., a direction perpendicular to the sheet of fig. 1. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction.
in the following description, the positive side (+ Z side) in the Z-axis direction is referred to as "rear side", and the negative side (-Z side) in the Z-axis direction is referred to as "front side". The rear side and the front side are names used for illustration only, and do not limit the actual positional relationship and direction. Unless otherwise specified, a direction parallel to the central axis J (Z-axis direction) is simply referred to as "axial direction", a radial direction about the central axis J is simply referred to as "radial direction", and a circumferential direction about the central axis J, that is, a direction around the central axis J (θ direction) is simply referred to as "circumferential direction".
In addition, in the present specification, "extend in the axial direction" includes a case of extending in a direction inclined in a range of less than 45 ° with respect to the axial direction, in addition to a case of strictly extending in the axial direction (Z-axis direction). In addition, in the present specification, "extend in the radial direction" includes a case of extending in a direction inclined in a range of less than 45 ° with respect to the radial direction, in addition to a case of extending strictly in the radial direction, that is, in a direction perpendicular to the axial direction (Z-axis direction).
[ first embodiment ]
< integral Structure >
Fig. 1 is a sectional view of a motor 1 of the first embodiment. As shown in fig. 1, a motor 1 of the present embodiment includes: a shaft 5 disposed along a central axis J extending in the axial direction; a rotor 10 fixed to the shaft 5; a stator 30 located radially outside the rotor 10; and a housing 40 that houses the rotor 10 and the stator 30. The motor 1 further includes a cover 50 at a rear end of the housing 40. The motor 1 is an inner rotor type motor. Hereinafter, each component will be described in detail.
< housing 40>
The case 40 has a thin tubular shape with a bottom, and includes a case tubular portion 41, a case bottom plate portion 43, and a flange portion 45.
(case tube 41)
the housing cylindrical portion 41 has a cylindrical shape surrounding the stator 30 in the circumferential direction. In the present embodiment, the housing tube portion 41 has, for example, a cylindrical shape centered on the central axis J. The housing tube 41 has a housing inner circumferential surface 41a that holds the stator 30.
(case bottom plate 43)
the case bottom plate portion 43 is connected to the front side (-Z side) end of the case tube portion 41. The case bottom plate portion 43 has: a circular ring portion 43a covering the front side of the stator 30; and a front bearing holding portion 43b located radially inward of the annular portion 43a and holding the front bearing 55. The annular portion 43a surrounds the front side of the stator 30 in an annular shape when viewed in the axial direction. The annular portion 43a is recessed in a sectional view so as to open to the rear side (+ Z side) and to be recessed to the front side.
The front bearing holder 43b is connected to the radially inner side of the annular portion 43a, and has a bottomed cylindrical shape protruding toward the front side. The front bearing holding portion 43b holds the front bearing 55 radially inward.
(Flange part 45)
the flange portion 45 is connected to the rear end of the housing tube portion 41. The flange portion 45 extends radially outward from the rear end of the housing tube portion 41 and has an annular shape when viewed in the axial direction.
< cover part 50>
The cover portion 50 is in the form of a circular plate, and is placed on and connected to the rear surface 45a of the flange portion 45. The cover portion 50 is fixed to the flange portion 45 by a fastening member such as a bolt and a nut. A rear bearing holding portion 50a for holding the rear bearing 57 is provided at a radially central portion of the cover portion 50. In the present embodiment, the rear bearing holder 50a has a cylindrical through hole 50a1 that penetrates in the axial direction. A step portion 50a2 protruding radially inward is annularly provided on the front side of the through hole 50a 1. The front end of the rear bearing 57 is in contact with the stepped portion 50a2, whereby the rear bearing 57 is positioned with respect to the hood 50 in the front direction.
< rotor 10>
Fig. 2 is a perspective view of the rotor 10. Fig. 3 is a side view of the rotor 10. As shown in fig. 1, 2, and 3, the rotor 10 has a cylindrical shape extending in the axial direction, and the rotor 10 includes: a through hole 13 extending in the axial direction into which the shaft 5 is inserted; a plurality of magnet accommodating holes 15 that penetrate in the axial direction and are provided at the radially inner peripheral edge of the rotor 10 at intervals in the circumferential direction; a plurality of magnets 17 inserted into the plurality of magnet receiving holes 15, respectively; and fixing portions 63 arranged at axial end portions on both sides in the axial direction of the rotor 10, for fixing the plurality of magnets 17 to the rotor 10.
In the present embodiment, the rotor 10 has a rotor core 11, and the rotor core 11 is provided with a through hole 13, a plurality of magnet accommodating holes 15, a plurality of magnets 17, and a fixing portion 63. The rotor core 11 is cylindrical and made of a ferromagnetic material. As shown in fig. 3, the through-hole 13 extends along the center axis J of the rotor core 11.
(rotor core 11)
As shown in fig. 2 and 3, rotor core 11 is formed by stacking a plurality of electromagnetic steel sheets 19, which have a circular shape when viewed in the axial direction, in the axial direction. The following components are provided on each of the plurality of electromagnetic steel sheets 19: a magnet housing hole 15a which is a part of the magnet housing hole 15; and a through hole portion 13a which is a part of the through hole 13. In the present embodiment, the magnetic steel sheets 19 have fixing holes 21a, and the fixing holes 21a are part of fixing holes 21 for fixing a plurality of magnetic steel sheets 19 stacked in the axial direction. The plurality of fixing holes 21a are arranged radially inward of the magnet housing holes 15a of the electromagnetic steel sheet 19 at predetermined intervals in the circumferential direction. The plurality of through holes 13a communicate in the axial direction to form through holes 13, and the plurality of fixing holes 21a communicate in the axial direction to form fixing holes 21.
(magnet 17)
As shown in fig. 3, the magnet 17 has a rectangular shape when viewed in the axial direction, and the magnet 17 has a rectangular parallelepiped shape extending in the axial direction. As shown in fig. 4, the circumferential end 17b of the magnet 17 has a planar surface portion 17 a. The axial length of the magnet 17 is shorter than the axial length of the magnet accommodating hole 15. The magnet 17 is, for example, a sintered magnet containing neodymium.
The magnet 17 has an inner corner 17c on the radially inner side in the circumferential end 17b of the magnet 17, and an outer corner 17d on the radially outer side in the circumferential end 17b of the magnet 17. In the present embodiment, the inside corner portion 17c and the outside corner portion 17d have a convex shape protruding at a right angle when viewed in the axial direction. The magnets 17 arranged adjacent to each other in the circumferential direction are arranged so that magnetic poles thereof are different.
The magnet 17 may be plated on the surface, for example, with nickel. By plating, corrosion of the magnet can be suppressed. The magnet 17 may be magnetized or not magnetized when inserted into the magnet receiving hole 15.
(magnet storage hole 15)
As shown in fig. 4, the magnet accommodating hole 15 includes an accommodating hole body 15b extending in a rectangular shape in the circumferential direction at the radially inner peripheral edge portion of the rotor 10. The magnet accommodating hole 15 has a pair of space hole portions 15c extending further in the circumferential direction than circumferential end portions 17b on both sides in the circumferential direction of the magnet 17 inserted into the magnet accommodating hole 15. That is, the magnet accommodating hole 15 includes an accommodating hole body portion 15b and a pair of space hole portions 15c extending in the circumferential direction from both circumferential sides of the accommodating hole body portion 15 b.
The radial width Wh of the housing hole body portion 15b is larger than the radial width Wm of the magnet 17. Therefore, when the magnet 17 is inserted into the housing hole body 15b, a gap is provided between the magnet 17 and the inner surface of the housing hole body 15b in the radial direction. The magnet 17 can be easily inserted into the housing hole main body 15b through the gap. Note that in fig. 4, the gap is not shown.
as shown in fig. 4, an inner surface 15d of the space hole portion 15c as a part of the magnet accommodating hole 15 includes: an inner surface facing portion 15d1 that faces the circumferential end 17b of the magnet 17 and extends in the radial direction; an inner surface inner portion 15d2 extending from the radially inner end of the inner surface facing portion 15d1 toward the inner corner 17c side of the magnet 17; and an inner surface outer portion 15d3 extending from the radial outer end of the inner surface facing portion 15d1 toward the outer corner 17d of the magnet 17.
in the present embodiment, as shown in fig. 4, the space hole portions 15c are wedge-shaped such that the circumferential intervals become narrower from the radially outer side toward the radially inner side when viewed in the axial direction. That is, the inner surface outer portion 15d3 is longer than the inner surface inner portion 15d 2. The inner surface facing portion 15d1 is inclined from the radially outer side to the radially inner side in the axial direction toward the circumferential end 17b side of the magnet 17 with respect to the circumferential end 17b of the magnet 17 inserted in the magnet accommodating hole 15. Therefore, the space hole 15c has a wedge shape when viewed in the axial direction.
(fixed part 63)
as shown in fig. 5, the fixing portion 63 includes: an annular plate portion 65 that covers the plurality of magnet receiving holes 15 provided in the circumferential edge portion of the rotor 10; and a protruding portion 67 that protrudes from a surface portion 65a of the plate portion 65 facing an axial end of the rotor 10 and is disposed in the space hole portion 15 c. In the present embodiment, the fixing portion 63 is nonmagnetic and made of a resin material. The fixing portion 63 is an integrally molded product. In addition, the plate portion 65 and the protruding portion 67 may be molded separately in the fixing portion 63.
The plurality of projections 67 are provided on the surface portion 65a of the plate portion 65 at intervals in the circumferential direction. As shown in fig. 3, the protrusion 67 is press-fitted into at least one of the pair of space holes 15c of the magnet accommodating hole 15 into which the magnet 17 is inserted. In the present embodiment, the protruding portions 67 are press-fitted into the pair of space holes 15c, respectively. As shown in fig. 3 and 5, the protruding portions 67 are arranged with a gap a in the circumferential direction of the plate portion 65, and a pair of protruding portions 67 are arranged. The pair of projections 67 is arranged along the circumferential direction of the plate portion 65 with an interval B therebetween in the circumferential direction of the plate portion 65. The interval a is a distance between the pair of space hole portions 15c of the magnet accommodating hole 15. The interval B is a circumferential distance between the magnet accommodating holes 16 arranged adjacent to each other in the circumferential direction of the rotor 10.
As shown in fig. 4, the cross-sectional shape of the projection 67 in the direction perpendicular to the axial direction is a wedge shape in which the circumferential intervals are narrowed from the radially outer side toward the radially inner side. In the present embodiment, the protrusion 67 includes: a circumferential inner surface portion 67a extending along a circumferential end portion 17b of the magnet 17; and a circumferential outer surface portion 67b extending along an inner surface facing portion 15d1 facing the circumferential end 17b of the magnet 17 among the inner surfaces 15d of the space hole portions 15c, the protrusion 67 having a trapezoidal cross section in a direction perpendicular to the axial direction. The projection 67 is press-fitted into the space hole 15 c.
By pressing the protruding portion 67 into the space hole portion 15c, the circumferential inner surface portion 67a of the protruding portion 67 is in contact with the circumferential end portion 17b of the magnet 17, and the circumferential outer surface portion 67b of the protruding portion 67 is in contact with the inner surface facing portion 15d1 of the space hole portion 15 c. In the magnet 17, the circumferential end 17b of the magnet 17 contacts the protrusion 67 press-fitted into the wedge-shaped space hole 15c, and the radial end of the magnet 17 contacts the radially outward inner surface 15d of the magnet accommodating hole 15.
< stator 30>
As shown in fig. 1, the stator 30 is located radially outside the rotor 10. The stator 30 surrounds the rotor 10 around the axis (θ direction) and rotates the rotor 10 around the center axis J. The stator 30 has a core back 30a, teeth 30b, coils 30c, and an insulator (bobbin) 30 d.
The core back 30a is cylindrical and concentric with the shaft 5. The tooth portion 30b extends from the inner side surface of the core back portion 30a toward the shaft 5. A plurality of teeth 30b are provided, and the teeth 30b are arranged at equal intervals in the circumferential direction of the inner surface of the core back 30 a. The coil 30c is provided around the insulator (bobbin) 30d and is formed by winding a conductive wire. An insulator (bobbin) 30d is attached to each tooth 30 b.
< shaft 5>
as shown in fig. 1, the shaft 5 extends along the central axis J and penetrates the rotor 10. The rear side of the shaft 5 extends through a rear bearing 57 provided in the cover 50. The front side of the shaft 5 protrudes from the rotor 10 and is supported by a front bearing 55 disposed in the front bearing holding portion 43b of the housing 40. Thus, the shaft 5 is supported by both ends.
< action of the present embodiment >
(positioning of magnet 17 with respect to magnet receiving hole 15)
First, the positioning of the magnet 17 will be described. As shown in fig. 4, when the protrusion 67 having a trapezoidal cross section is press-fitted into both sides of the pair of wedge-shaped space hole portions 15c, a force in the vertical direction acts on the circumferential end portion 17b of the magnet 17 from the circumferential inner surface portion 67a of the protrusion 67. In addition, a force in the vertical direction acts from the circumferential outer surface portion 67b of the protruding portion 67 to the inner surface opposing portion 15d 1. Therefore, the magnet 17 is fixed to the magnet accommodating hole 15 by being integrated with the protruding portion 67 pressed into the pair of space holes 15 c. Thereby, the magnet 17 is positioned in the circumferential direction and the radial direction with respect to the magnet accommodating hole 15.
< effects of the present embodiment >
(1) As shown in fig. 5, the fixing portion 63 includes: an annular plate portion 65 that covers the plurality of magnet receiving holes 15 provided in the circumferential edge portion of the rotor 10; and a protrusion 67 that protrudes in the axial direction from a surface portion 65a of the plate portion 65 facing the axial end of the rotor 10 toward the inside of the space hole 15c and is disposed in the space hole 15 c. The magnet 17 is in contact with the protrusion 67 and the inner surface 15d of the magnet receiving hole 15. Therefore, the magnet 17 can be positioned at least in the circumferential direction with respect to the magnet accommodating hole 15.
(2) In the present embodiment, the protruding portion 67 is press-fitted into at least one of the pair of space hole portions 15c of the magnet accommodating hole 15 into which the magnet 17 is inserted. Therefore, the magnet 17 is pressed by the protrusion 67 press-fitted into the space hole 15c, and the magnet 17 can be brought into contact with the protrusion 67.
(3) in the present embodiment, by press-fitting the protruding portion 67 into the space hole portion 15c, the circumferential inner surface portion 67a of the protruding portion 67 is brought into contact with the circumferential end portion 17b of the magnet 17, and the circumferential outer surface portion 67b of the protruding portion 67 is brought into contact with the inner surface facing portion 15d1 of the space hole portion 15 c. Therefore, the magnet 17 is pressed at least in the circumferential direction of the magnet accommodating hole 15 via the protrusion 67, and is positioned at least in the circumferential direction with respect to the magnet accommodating hole 15 by being in contact with the protrusion 67.
(4) In the present embodiment, the space hole 15c has a wedge shape in which the circumferential interval is narrowed from the radially outer side to the radially inner side, and the protrusion 67 is press-fitted into the space hole 15 c. Therefore, the circumferential end 17b of the magnet 17 is pressed by the protrusion 67 toward the space hole 15c opposite to the space hole 15c into which the protrusion 67 is pressed and radially inward. Thereby, the magnet 17 is in contact with the protrusion 67 and the radial inner surface 15d of the magnet accommodating hole 15, and is positioned in the circumferential direction and the radial direction with respect to the magnet accommodating hole 15.
(5) In the present embodiment, the cross-sectional shape of the projection 67 in the direction perpendicular to the axial direction is a wedge shape in which the circumferential intervals are narrowed from the radially outer side toward the radially inner side. Therefore, when the protrusion 67 is press-fitted into the wedge-shaped space hole portion 15c, the protrusion 67 presses the magnet 17 inserted into the magnet accommodating hole 15 in at least the circumferential direction by the wedge action. Therefore, the magnet 17 is fixed in a state of being positioned in the circumferential direction and the radial direction with respect to the magnet accommodating hole 15.
(6) In the present embodiment, the protrusion portion 67 has a circumferential inner surface portion 67a and a circumferential outer surface portion 67b, and has a trapezoidal cross-sectional shape. The projection 67 is thus wedge-shaped. Thus, when the protruding portion 67 is press-fitted into the wedge-shaped space hole portion 15c, the protruding portion 67 fits into the wedge shape of the space hole portion 15c, and the circumferential inner surface portion 67a of the protruding portion 67 presses the circumferential end portion 17b of the magnet 17 at least in the circumferential direction. Therefore, the magnet 17 is more firmly fixed in a state of being positioned in the circumferential direction and the radial direction with respect to the magnet receiving hole 15.
(7) In the present embodiment, the fixing portion 63 is nonmagnetic. Therefore, when the rotor 10 is driven, the magnetic lines of force passing through the rotor 10 are guided to the fixing portion 63, and the possibility of magnetic short circuit (magnetic flux leakage) between the circumferentially adjacent magnets 17 can be prevented.
[ modified example of the first embodiment ]
(modification 1 of the position of the protruding portion 67 pressed into the pair of space holes 15c of the magnet accommodating hole 15)
Fig. 6A is a partial side view of the rotor 10 in which the protruding portion 67 of the fixing portion 63 is inserted into one circumferential side of the magnet accommodating hole 15. In the magnet accommodating hole 15 of the first embodiment shown in fig. 3, the protruding portions 67 are disposed in both of the pair of space hole portions 15c of the magnet accommodating hole 15. However, the present invention is not limited to this structure, and for example, as shown in fig. 6A, the protrusion 67 may be press-fitted into the space hole portion 15c on the same circumferential side of each of the magnet accommodating holes 15 adjacent in the circumferential direction (modification 1).
in the modification 1, the case where the protruding portion 67 is press-fitted into one circumferential side (left side) of the pair of space hole portions 15c of the magnet accommodating hole 15 is shown, but the protruding portion 67 may be press-fitted into the other circumferential side (right side) of the pair of space hole portions 15 c. The protrusion 67 is press-fitted into the space hole portion 15c on the same circumferential side of the circumferentially adjacent magnet accommodating holes 15, thereby positioning the plurality of magnets 17 at the same interval in the circumferential direction with respect to the rotor 10. This allows the plurality of magnets 17 to be arranged uniformly in the circumferential direction of the rotor 10.
Fig. 6B is a partial side view of the rotor 10 in which the protruding portions 67 are inserted into the opposed space holes 15c of the magnet housing holes 15 adjacent in the circumferential direction (modification 2 in the positions of the protruding portions 67 press-fitted into the pair of space holes 15c of the magnet housing holes 15). In the magnet accommodating hole 15 of the first embodiment shown in fig. 3, the protruding portions 67 are disposed in both of the pair of space hole portions 15c of the magnet accommodating hole 15. However, the present invention is not limited to this structure, and for example, as shown in fig. 6B, the protrusion 67 may be press-fitted into the different circumferential-side space hole portions 15c of the circumferentially adjacent magnet accommodating holes 15 (modification 2).
In modification 2, the protrusion 67 is press-fitted into the different circumferential-side space hole portions 15c of the circumferentially adjacent magnet accommodating holes 15. Therefore, among the plurality of magnets 17, 2 magnets 17 adjacent in the circumferential direction are paired, and the paired 2 magnets 17 are arranged so as to have the same interval in the circumferential direction with respect to the other paired 2 magnets 17. This allows the pair of 2 magnets 17 to be arranged uniformly in the circumferential direction of the rotor 10.
(modification of the sectional shape of the projection 67)
The cross-sectional shape of the protruding portion 67 of the fixing portion 63 of the first embodiment shown in fig. 4 is wedge-shaped and trapezoidal. However, the structure is not limited to this, and for example, the cross-sectional shape of the protruding portion 67 may be a circular shape (modification 3).
In modification 3, the cross-sectional shape of the protrusion 67 in the direction perpendicular to the axial direction is a circular shape. Therefore, when the protruding portion is pressed into the wedge-shaped space hole portion 15c, the protruding portion 67 presses the magnet 17 inserted into the magnet accommodating hole 15 in at least the circumferential direction by the wedge action of the space hole portion 15 c. Therefore, the magnet 17 is positioned in the circumferential direction and the radial direction with respect to the magnet receiving hole 15. In addition, the cross-sectional shape of the protruding portion 67 is a circular shape, so that the structure of the protruding portion 67 is simplified.
(modification example of changing the shape of the projection 67 in the axial direction)
The protruding portion 67 of the fixing portion 63 of the first embodiment shown in fig. 5 has the same cross-sectional shape and extends in the protruding direction. However, the configuration is not limited thereto. For example, at least the cross section of the tip end portion of the protruding portion 67 in the protruding direction in the direction perpendicular to the protruding direction may be made smaller as it goes to the protruding direction tip end side (modification 4).
In the 4 th modification, at least the cross section of the tip end portion of the protruding portion 67 in the protruding direction becomes smaller as it goes to the protruding direction tip end side. Therefore, when the protrusion 67 is press-fitted into the space hole 15c, the tip end of the protrusion 67 can be easily inserted into the space hole 15 c.
While the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the present invention.
Description of the reference symbols
1: a motor; 5: a shaft; 10: a rotor; 13: a through hole; 15: a magnet receiving hole; 15 c: a space hole portion; 15 d: an inner surface; 17: a magnet; 17 b: a circumferential end portion; 30: a stator; 40: a housing; 63: a fixed part; 65: a plate portion; 65 a: a face; 67: a protrusion; 67 a: a circumferential inner surface portion; 67 b: a circumferential outer surface portion; j: a central axis.
Claims (13)
1. A motor, comprising:
A shaft disposed along a central axis extending in an axial direction;
A rotor fixed to the shaft;
a stator located radially outward of the rotor; and
A housing that houses the rotor and the stator,
The rotor is in a cylindrical shape extending in the axial direction,
The rotor has:
a through hole extending in an axial direction and into which the shaft is inserted;
A plurality of magnet accommodating holes that penetrate in the axial direction and are provided at the radially inner peripheral edge of the rotor at intervals in the circumferential direction;
A plurality of magnets inserted into the plurality of magnet receiving holes, respectively; and
a fixing portion that is disposed at axial end portions on both sides in an axial direction of the rotor and fixes the plurality of magnets to the rotor,
The magnet accommodating hole has a pair of space hole portions extending further in the circumferential direction than circumferential end portions on both sides in the circumferential direction of the magnet inserted into the magnet accommodating hole,
The fixing portion has:
An annular plate portion that covers the plurality of magnet accommodating holes provided in the circumferential edge portion of the rotor in the circumferential direction; and
A protruding portion that protrudes from a surface portion of the plate portion facing the axial end portion of the rotor toward an inner side of the space hole and is disposed in the space hole,
The magnet is in contact with the protrusion disposed in the space hole and an inner surface of the magnet accommodating hole.
2. The motor of claim 1,
A plurality of the protruding portions are provided on the face portion of the plate portion with an interval in a circumferential direction,
the protrusion is press-fitted into at least one of the pair of space holes of the magnet receiving hole into which the magnet is inserted.
3. The motor of claim 2,
The protrusion is press-fitted into one of the pair of space holes of the magnet receiving hole into which the magnet is inserted,
The projection is press-fitted into the space hole portion on the same circumferential side of each of the circumferentially adjacent magnet accommodating holes.
4. The motor of claim 2,
The protrusion is press-fitted into one of the pair of space holes of the magnet receiving hole into which the magnet is inserted,
The projection is press-fitted into the space hole portion on a different circumferential side of each of the circumferentially adjacent magnet accommodating holes.
5. the motor of claim 2,
The magnet is in a rectangular shape when viewed along the axial direction, the magnet is in a rectangular shape extending along the axial direction,
the protruding portion has:
A circumferential inner surface portion extending along a circumferential end portion of the magnet in a cross section in a direction perpendicular to an axial direction; and
A circumferential outer surface portion extending along an inner surface facing portion opposed to the circumferential end portion of the magnet among the inner surfaces of the space hole portion,
By press-fitting the protruding portion into the space hole portion, the circumferential inner surface portion of the protruding portion is brought into contact with the circumferential end portion of the magnet, and the circumferential outer surface portion of the protruding portion is brought into contact with the inner surface facing portion of the space hole portion.
6. the motor of claim 5,
The space hole portion has a wedge shape in which a circumferential interval is narrowed from a radially outer side to a radially inner side when viewed in an axial direction,
In the magnet, the circumferential end portion of the magnet is in contact with the protruding portion press-fitted into the wedge-shaped space hole portion, and the radial end portion of the magnet is in contact with the inner surface of the magnet accommodating hole facing radially outward.
7. The motor of claim 6,
the cross-sectional shape of the protruding portion in the direction perpendicular to the axial direction is a wedge shape in which the circumferential intervals are narrowed from the radially outer side toward the radially inner side.
8. The motor of claim 6,
The cross-sectional shape of the protruding portion in a direction perpendicular to the axial direction is a circular shape.
9. The motor of claim 6,
the magnet is in a rectangular shape when viewed along the axial direction, the magnet is in a rectangular shape extending along the axial direction,
The protruding portion has the circumferential inner surface portion and the circumferential outer surface portion, and a cross section of the protruding portion in a direction perpendicular to the axial direction is trapezoidal.
10. The motor of claim 1,
The fixing portion is non-magnetic.
11. The motor of claim 10,
The fixing portion is made of a resin material.
12. The motor of claim 2,
The lengths of the plurality of protruding portions of the fixing portion protruding from the plate portion in the protruding direction may be the same or different.
13. the motor of claim 2,
At least the front end of the protruding portion in the protruding direction has a cross section in a direction perpendicular to the protruding direction that decreases as it advances toward the front end in the protruding direction.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201762479492P | 2017-03-31 | 2017-03-31 | |
| US62/479,492 | 2017-03-31 | ||
| PCT/JP2018/010576 WO2018180634A1 (en) | 2017-03-31 | 2018-03-16 | Motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110574258A true CN110574258A (en) | 2019-12-13 |
Family
ID=63675542
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880022990.5A Withdrawn CN110574258A (en) | 2017-03-31 | 2018-03-16 | Motor with a stator having a stator core |
| CN201880022985.4A Pending CN110521086A (en) | 2017-03-31 | 2018-03-16 | Motor |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880022985.4A Pending CN110521086A (en) | 2017-03-31 | 2018-03-16 | Motor |
Country Status (3)
| Country | Link |
|---|---|
| JP (2) | JPWO2018180636A1 (en) |
| CN (2) | CN110574258A (en) |
| WO (2) | WO2018180636A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7012878B2 (en) * | 2018-12-20 | 2022-01-28 | 三菱電機株式会社 | How to manufacture rotors, motors, blowers, air conditioners and rotors |
| EP3955429A4 (en) * | 2019-04-11 | 2022-05-25 | Panasonic Intellectual Property Management Co., Ltd. | Motor and electric device |
| JP7362788B2 (en) | 2021-09-29 | 2023-10-17 | 株式会社東芝 | rotor of rotating electric machine |
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| JP5897110B2 (en) * | 2012-03-23 | 2016-03-30 | 三菱重工業株式会社 | Motor and electric compressor using the same |
| JP5851365B2 (en) * | 2012-08-31 | 2016-02-03 | 日立オートモティブシステムズ株式会社 | Rotating electric machine |
| JP5935615B2 (en) * | 2012-09-14 | 2016-06-15 | 株式会社デンソー | Rotating electrical machine rotor |
| JP6210711B2 (en) * | 2013-04-23 | 2017-10-11 | 株式会社日立産機システム | Permanent magnet motor |
| EP3322071A1 (en) * | 2015-02-18 | 2018-05-16 | Nidec Motor Corporation | Electric motor |
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- 2018-03-16 WO PCT/JP2018/010593 patent/WO2018180636A1/en active Application Filing
- 2018-03-16 WO PCT/JP2018/010576 patent/WO2018180634A1/en active Application Filing
- 2018-03-16 CN CN201880022990.5A patent/CN110574258A/en not_active Withdrawn
- 2018-03-16 JP JP2019509305A patent/JPWO2018180636A1/en active Pending
- 2018-03-16 CN CN201880022985.4A patent/CN110521086A/en active Pending
- 2018-03-16 JP JP2019509304A patent/JPWO2018180634A1/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2018180634A1 (en) | 2020-02-06 |
| WO2018180634A1 (en) | 2018-10-04 |
| WO2018180636A1 (en) | 2018-10-04 |
| CN110521086A (en) | 2019-11-29 |
| JPWO2018180636A1 (en) | 2020-02-06 |
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| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20191213 |