JP2012125111A - Rotor of outer rotor type rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor of an outer rotor type rotary machine which suppresses increase in the number of components, securely fixes magnets to a rotor core without deteriorating productivity, and prevents the peeling of the magnets.SOLUTION: A rotor 10 of an outer rotor type rotary machine includes: a substantially annular rotor core 11; multiple magnets 12 fixed to an inner peripheral surface of the rotor core 11; and a rotor cup 14 holding the rotor core 11 from the radial outward direction and fixed to a rotation shaft 13. The rotor core 11 includes multiple recessed parts 15, which are recessed in the radial outward direction and have lower core taper surfaces 16 serving as engaged parts on inner wall surfaces which face each other in a circumferential direction, on the inner peripheral surface. Each magnet 12 includes magnet taper surfaces 12c, 12d serving as engaging parts which engage with the rotor core taper surfaces 16 on circumferential direction end surfaces. Each magnet 12 is disposed in the recessed part 15 with the magnet taper surfaces 12c, 12d of the magnet 12 engaging with the rotor core taper surfaces 16 formed on the rotor core 11.

Description

  The present invention relates to a rotor of an outer rotor type rotating machine.

  2. Description of the Related Art Conventionally, there is an outer rotor type rotating machine configured such that a plurality of permanent magnets are arranged on the inner peripheral surface of a rotor core, and a rotor coil is rotated by a rotating magnetic field generated in the coil by energizing a stator coil arranged opposite to the rotor. Are known. An attractive force and a repulsive force act on the permanent magnet in the radial direction by the interaction of the magnetic flux generated from the permanent magnet and the stator. By adopting an outer rotor type in which the permanent magnet is fixed to the inner peripheral surface of the rotor core, even if the permanent magnet is peeled off from the rotor core, the permanent magnet can be prevented from scattering radially outward, but as a rotating machine The function of is lost.

  In order to prevent the permanent magnet from peeling from the rotor core, conventionally, the permanent magnet is molded, or the permanent magnet is fixed to the rotor core with a wire or the like (for example, see Patent Documents 1 and 2).

  FIG. 6 is a cross-sectional view of a main part for explaining the configuration of the rotating machine described in Patent Document 1. The rotor 100 includes a substantially annular flywheel body 101 and an inner peripheral surface 102 of the flywheel body 101. And a plurality of plate-like permanent magnets 103 arranged in the circumferential direction. The stator 104 is configured by winding a winding 107 around a slot 106 of a stator core 105 made of a laminated magnetic material, and is disposed to face the rotor 100 with a gap G interposed therebetween. The permanent magnet 103 has flat magnetic pole surfaces 103a and 103b, the radially outer magnetic pole surface 103a is fixed to the inner peripheral surface 102 of the flywheel body 101 with an adhesive, and the radially inner magnetic pole surface 103b is It is covered with the mold resin 108 with the central region 103c in the width direction exposed. Thereby, the permanent magnet 103 is fixed to the flywheel body 101.

  FIG. 7A is a plan view of the rotating machine described in Patent Document 2, FIG. 7B is an enlarged plan view showing attachment of a permanent magnet to the rotor core, and the outer rotor type rotating machine 110 has a ring shape. And a plurality of permanent magnets 112 arranged at equal intervals in the circumferential direction on the inner peripheral surface of the rotor core 111. The inner peripheral surface of the rotor core 111 includes a magnet installation portion 113 formed at equal intervals in the circumferential direction and a projection 114 adjacent to the magnet installation portion 113. Further, the rotor core 111 has a hole 115 on the radially outer side of the magnet installation portion 113. Then, after the permanent magnet 112 is installed in the magnet installation section 113, the permanent magnet 112 is engaged with the projection 114 and the hole 115, and the wire 116 is wound around to be in contact with both ends of the inner peripheral surface of the permanent magnet 112. A magnet 112 is fixed to the rotor core 111.

JP 2004-222455 A Japanese Patent No. 4391886

  However, according to Patent Document 1, since the permanent magnet 103 is covered with the mold resin 108 and fixed to the flywheel body 101, a molding process for fixing the permanent magnet 103 is necessary, and productivity is reduced. At the same time, there is a problem that the manufacturing cost increases. Further, according to Patent Document 2, the permanent magnet 112 is fixed to the rotor core 111 by tightening the wire 116 that engages with the protrusion 114 and the hole 115 of the rotor core 111. Therefore, the number of parts for fixing increases. There was a problem that the manufacturing cost increased, and there was room for improvement.

  The present invention has been made in view of the above-described problems, and an object thereof is to suppress the increase in the number of parts and securely fix the magnet to the rotor core without decreasing the productivity. An object of the present invention is to provide a rotor of an outer rotor type rotating machine that can prevent the above.

In order to achieve the above object, the invention according to claim 1
A substantially annular rotor core (for example, a rotor core 11 in an embodiment described later);
A plurality of magnets fixed to the inner peripheral surface of the rotor core (for example, a magnet 12 in an embodiment described later);
A holding member (for example, a rotor cup 14 in an embodiment described later) that holds the rotor core from the radially outer side and is fixed to a rotation shaft (for example, a rotation shaft 13 in an embodiment described later);
An outer rotor type rotating machine (for example, an outer rotor type rotating machine 1 in an embodiment described later) that faces a stator (for example, a stator 2 in an embodiment described later) disposed radially inward via a predetermined gap. ) Rotor (for example, the rotor 10 in the embodiment described later)
The rotor core is formed with a plurality of recesses (for example, recesses 15 in the embodiments described later) recessed toward the radially outer side on the inner peripheral surface to accommodate the magnet.
The magnet has engaging portions (for example, magnet taper surfaces 12c and 12d in the embodiments described later) on both circumferential end surfaces,
The concave portion has an engaged portion (for example, a rotor core tapered surface 16 in an embodiment described later) that engages with the engaging portion on an inner wall surface facing in the circumferential direction.

In addition to the configuration of claim 1, the invention according to claim 2
The engaging portion is radial along a straight line (for example, a straight line L in an embodiment described later) passing through a circumferential width center of the magnet and a rotation center of the rotor (for example, rotation center C in an embodiment described later). It is a magnet taper surface (for example, magnet taper surfaces 12c and 12d in the embodiments described later) formed such that the circumferential width of the magnet increases toward the outside,
The engaged portion is a rotor core taper surface (for example, a rotor core taper surface 16 in an embodiment described later) formed on an inner wall surface facing in the circumferential direction of the recess so as to engage with the magnet taper surface. It is characterized by.

In addition to the configuration of claim 1 or 2, the invention according to claim 3
Between the concave portions adjacent to each other in the circumferential direction of the rotor core, a convex portion that protrudes inward in the radial direction (for example, a reluctance projection 17 in an embodiment described later) is formed,
A magnetic gap (for example, a magnetic gap g in an embodiment described later) is formed between the convex portion and the magnet.

In addition to the configuration of claim 3, the invention according to claim 4
A circumferential end portion (for example, a circumferential end portion P1 in an embodiment described later) of the convex teeth facing surface (for example, a flat surface 17a in an embodiment described later) and a teeth facing surface of the magnet (for example, described later) The distance (for example, the distance A of the magnetic air gap in the embodiment described later) between the circumferential end (for example, the circumferential end P2 in the embodiment described later) of the inner peripheral surface 12b in the embodiment. ) Is the maximum distance (for example, the radial direction in the later-described embodiment) of the radial gap formed between the teeth-facing surfaces of the magnets facing each other and the teeth of the stator (for example, the teeth 3b in the later-described embodiments). Characterized by greater than the maximum distance B) of the gap

In addition to the structure of any one of Claims 1-4, the invention which concerns on Claim 5 is
The rotor core is configured by laminating a plurality of annular electromagnetic steel plates in the rotation axis direction,
Each of the electromagnetic steel plates is configured by combining a plurality of substantially arc-shaped electromagnetic steel plates (for example, an arc-shaped electromagnetic steel plate 21 in an embodiment described later).

In addition to the configuration of claim 3 or 4, the invention according to claim 6
The rotor core includes a substantially annular integrated yoke (for example, an integrated yoke 25 in an embodiment described later) and a plurality of convex forming members (for example, described later) formed by laminating a plurality of electromagnetic steel plates in the rotation axis direction. Reluctance protrusion forming member 26) in the embodiment of
The convex portion forming member has the convex portion.

  According to the first aspect of the present invention, by engaging the engaging portion of the magnet with the engaged portion formed on the rotor core and arranging the magnet on the inner peripheral surface of the rotor core, the manufacturing process and the number of parts can be reduced. The magnet can be firmly fixed to the rotor core without being increased, and separation of the magnet from the rotor core can be prevented.

  According to the invention of claim 2, even if a force directed radially inward acts on the magnet, the force is received by the magnet taper surface and the rotor core taper surface that are engaged with each other, and the magnet is engaged with the rotor core. Is prevented from being released.

  According to the invention of claim 3, the reluctance torque can be utilized by the convex portion while suppressing the magnetic flux generated from one magnetic pole surface of the magnet from short-circuiting to the other magnetic pole surface through the convex portion. The performance of the outer rotor type rotating machine is improved.

  According to the fourth aspect of the present invention, the magnetic resistance caused by the magnetic gap between the magnet and the convex portion is made larger than the magnetic resistance caused by the radial gap between the magnet and the teeth regardless of the rotation angle of the rotor. It is possible to suppress the magnetic flux generated from one magnetic pole surface of the magnet from being short-circuited to the other magnetic pole surface through the convex portion.

  According to the fifth aspect of the present invention, when the electromagnetic steel sheet is punched to create the rotor core, the amount of the electromagnetic steel sheet that is wasted during manufacturing can be reduced compared with the case of punching the annular magnetic steel sheet, and the rotor core can be manufactured. Costs can be reduced.

  According to invention of Claim 6, compared with the case where a plurality of electromagnetic steel plates are laminated in the axial direction to form an annular rotor core, the manufacturing cost can be suppressed and the magnetic flux passing through the convex portion can be reduced. The generated eddy current loss can be reduced.

It is a longitudinal cross-sectional view of the outer rotor type rotary machine of 1st Embodiment of this invention. It is a principal part enlarged view of the outer rotor type | mold rotary machine shown in FIG. It is a principal part enlarged view of the modification of the outer rotor type rotary machine shown in FIG. It is a principal part enlarged view of the outer rotor type | mold rotary machine of 2nd Embodiment of this invention. It is a principal part enlarged view of the outer rotor type | mold rotary machine of 3rd Embodiment of this invention. It is principal part sectional drawing for demonstrating the structure of the rotary machine of patent document 1. FIG. (A) is a top view of the rotary machine of patent document 2, (b) is the elements on larger scale of (a) which show the attachment to the rotor core of a permanent magnet.

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
(First embodiment)

  As shown in FIG. 1 and FIG. 2, the outer rotor type rotating machine 1 of the present embodiment includes a stator 2 and an annular rotor 10 disposed to face the outer side in the radial direction of the stator 2 with a slight gap. It is prepared for.

  The stator 2 includes a stator core 3 and a plurality of coils 4. The stator core 3 includes a plurality of teeth 3b formed by laminating a plurality of electromagnetic steel plates in the axial direction and projecting radially outward from the annular support portion 3a. A plurality of convex portions 3d each having a bolt hole 3c are provided inside the support portion 3a, and the stator core 3 is fixed to a motor housing (not shown) by bolts (not shown) inserted through the bolt holes 3c. Yes. The coil 4 is formed by winding the winding 6 around the teeth 3b of the stator core 3 through an insulator 7 formed of a synthetic resin having insulating characteristics.

  The rotor 10 has a substantially annular rotor core 11, a plurality of magnets 12 fixed to the inner peripheral surface of the rotor core 11, and an edged disk shape that holds the rotor core 11 from the outside in the radial direction and is fixed to the rotating shaft 13. And a rotor cup 14. The rotating shaft 13 is rotatably supported with respect to the motor housing by a bearing (not shown), and the rotor 10 is rotationally driven by a rotating magnetic field generated in the stator 2.

  The rotor core 11 is configured by laminating a plurality of annular electromagnetic steel plates in the axial direction, and the outer peripheral surface 11 a is press-fitted and fixed to the edge inner peripheral surface 14 a of the rotor cup 14. On the inner peripheral surface of the rotor core 11, a plurality of recesses 15 that are recessed outward in the radial direction so as to accommodate the magnet 12 are formed at predetermined intervals in the circumferential direction. A rotor core taper surface 16 (engaged portion) is provided on an inner wall surface (hereinafter also referred to as a circumferential inner wall surface) of each recess 15 facing in the circumferential direction. The rotor core taper surface 16 is formed in a tapered shape so as to gradually increase in width toward the outer side in the radial direction, and engages with magnet taper surfaces 12c and 12d of the magnet 12 described later.

  In addition, a reluctance protrusion 17 that is a protrusion protruding inward in the radial direction is provided between the recesses 15 adjacent to each other in the circumferential direction. The reluctance protrusion 17 is configured to have a substantially rectangular cross section so that a flat surface 17a having a predetermined width faces the teeth 3b of the stator 2, and from the rotor core taper surface 16 of the recesses 15 and 15 adjacent in the circumferential direction to the tip side (inner diameter side). ) And is provided at the tip of the connecting portion 18 that is tapered.

  The magnet 12 has a substantially quadrangular prism shape as a whole, and the outer peripheral surface 12a and the inner peripheral surface 12b are flat. Further, both end surfaces in the circumferential direction are inclined such that the circumferential width of the magnet 12 gradually increases toward the outer side in the radial direction along a straight line L passing through the circumferential width center of the magnet 12 and the rotation center C of the rotor 10. Tapered surfaces 12 c and 12 d (engagement portions) are formed, and the magnet tapered surfaces 12 c and 12 d are engaged with the rotor core tapered surface 16 of the rotor core 11. The magnet 12 is magnetized in the radial direction so that the polarity of the outer peripheral surface 12a and the polarity of the inner peripheral surface 12b are different from each other.

  The rotor 10 is formed by press-fitting and fixing the outer peripheral surface 11a of the annular rotor core 11 to the inner peripheral surface 14a of the edge of the rotor cup 14 manufactured by press molding, for example, and then the magnet taper surfaces 12c and 12d of the magnet 12; The magnet 12 is assembled by inserting it into the recess 15 from the axial direction while engaging the rotor core tapered surface 16 of the rotor core 11. When assembling, an adhesive may be applied to the joint between the rotor core 11 and the magnet 12 to increase the bonding strength.

  In the rotor 10 assembled in this way, the inner peripheral surface 12b of the magnet 12 and the flat surface 17a formed at the radially inner end of the reluctance protrusion 17 are respectively opposed to the teeth 3b of the stator 2 in the radial direction. And the teeth are facing each other.

  Further, as shown in FIG. 2, a magnetic gap g is formed between the circumferential end P1 of the flat surface 17a of the reluctance projection 17 and the circumferential end P2 of the inner peripheral surface 12b of the magnet 12. ing. The distance A of the magnetic gap g between the circumferential end P1 of the flat surface 17a of the reluctance protrusion 17 and the circumferential end P2 of the inner peripheral surface 12b of the magnet 12 is the inner peripheral surface 12b of the opposing magnet 12. Is set to be larger than the maximum distance B of the radial clearance between the circumferential end P2 of the stator and the outer peripheral surface 3e of the tooth 3b of the stator core 3.

  In the present embodiment, when the circumferential end P2 of the inner circumferential surface 12b of the magnet 12 is positioned on a straight line T passing through the circumferential width center of the tooth 3b and the rotation center C of the rotor 10, the magnet 12 The radial clearance between the circumferential end P2 and the outer peripheral surface 3e of the tooth 3b of the stator core 3 is maximized.

  Due to the magnetic gap g, the magnetic resistance between the magnet 12 and the reluctance protrusion 17 is made larger than the magnetic resistance due to the radial gap between the magnet 12 and the teeth 3b regardless of the rotation angle of the rotor 10. The magnetic flux generated from the outer peripheral surface 12a that is one magnetic pole surface of the magnet 12 can be prevented from short-circuiting to the inner peripheral surface 12b that is the other magnetic pole surface through the reluctance protrusion 17.

  As described above, according to the rotor 10 of the outer rotor type rotating machine according to the present embodiment, the rotor core 11 is recessed toward the radially outer side on the inner peripheral surface and engaged with the inner wall surface facing in the circumferential direction. The magnet 12 includes a plurality of recesses 15 having a rotor core taper surface 16 that is a portion, and the magnet 12 includes magnet tapered surfaces 12c and 12d that are engaging portions that engage with the rotor core taper surface 16 on the circumferential end surface. By engaging the magnet taper surfaces 12c and 12d with the rotor core taper surface 16 formed on the rotor core 11 and disposing the magnet 12 in the recess 15, the magnet 12 is strengthened without increasing the manufacturing process and the number of parts. The magnet 12 can be fixed to the rotor core 11 and the magnet 12 can be prevented from peeling off from the rotor core 11.

  Further, the engaging portion of the magnet 12 is a magnet taper surface in which the circumferential width of the magnet 12 increases as it goes radially outward along the straight line L passing through the circumferential center of the magnet 12 and the rotation center C of the rotor 10. 12c and 12d, and the engaged portion of the rotor core 11 is the rotor core taper surface 16 that engages with the magnet taper surfaces 12c and 12d. Therefore, the radially inward forces acting on the magnet 12 engage with each other. It is received by the magnet taper surfaces 12c and 12d and the rotor core taper surface 16, and the engagement between the magnet 12 and the rotor core 11 is prevented from being released.

  Further, a reluctance protrusion (protrusion) 17 protruding radially inward is provided between the recesses 15 adjacent in the circumferential direction of the rotor core 11, and a magnetic gap g is provided between the reluctance protrusion 17 and the magnet 12. It is formed. Thereby, the magnetic flux generated from the outer peripheral surface 12a which is one magnetic pole surface of the magnet 12 passes through the reluctance protrusion 17 and is short-circuited to the inner peripheral surface 12b which is the other magnetic pole surface, and the other magnetic pole surface of the magnet 12. The reluctance projection 17 can utilize the reluctance torque while preventing the magnetic flux generated from the inner circumferential surface 12b from being short-circuited to the outer circumferential surface 12a, which is one magnetic pole surface, through the reluctance projection 17, and the outer rotor type rotation. The performance of the machine 1 is improved.

  The distance A of the magnetic gap g between the circumferential end P1 of the flat surface 17a of the reluctance protrusion 17 and the circumferential end P2 of the inner peripheral surface 12b of the magnet 12 is the same as that of the inner peripheral surface 12b of the magnet 12. Since it is larger than the maximum distance B of the radial gap formed between the circumferential end P2 and the teeth 3b of the stator 2, the magnetic force between the magnet 12 and the reluctance protrusion 17 is independent of the rotation angle of the rotor 10. The magnetic resistance due to the gap g can be made larger than the magnetic resistance due to the radial gap between the magnet 12 and the stator core 3. Thereby, the magnetic flux generated from the outer peripheral surface 12a which is one magnetic pole surface of the magnet 12 passes through the reluctance protrusion 17 and is short-circuited to the inner peripheral surface 12b which is the other magnetic pole surface, and the other magnetic pole surface of the magnet 12. It is possible to suppress a magnetic flux generated from the inner peripheral surface 12b from passing through the reluctance protrusion 17 and short-circuiting to the outer peripheral surface 12a which is one magnetic pole surface.

(Modification)
FIG. 3 is an enlarged view of a main part of a modified example of the outer rotor type rotating machine according to the first embodiment.
The outer rotor type rotating machine of this modification is the same as the rotor of the first embodiment except that the outer peripheral surface 12a and the inner peripheral surface 12b of the magnet 12 are arc-shaped magnets formed in an arcuate shape. Even if the magnet 12 is used in this way, the same effects as those of the first embodiment can be obtained.

(Second Embodiment)
FIG. 4 is an enlarged view of the main part of the outer rotor type rotating machine of the second embodiment. The configuration of the rotor core is only different from the rotor core of the first embodiment, and the other configurations are the same. The same reference numerals or equivalent reference numerals are attached and the description is simplified or omitted. Hereinafter, the rotor core will be mainly described.

  As shown in FIG. 4, the rotor core 11 </ b> A of the present embodiment is formed in an annular shape by combining substantially circular arc-shaped electromagnetic steel plates 21 obtained by dividing the rotor core 11 of the first embodiment with a predetermined width in the circumferential direction. The The arcuate electromagnetic steel sheet 21 has a concave portion 22 that is recessed in the circumferential direction on one end surface 21a in the circumferential direction, and a convex portion 23 that can be engaged with the concave portion 22 on the other end surface 21b in the circumferential direction.

  Then, a plurality of substantially arc-shaped electromagnetic steel sheets 21 are connected to the recesses 22 of the arc-shaped electromagnetic steel sheets 21 one after another, and are formed in an annular shape. An annular rotor core 11 </ b> A is configured by laminating arc-shaped electromagnetic steel plates 21 in the axial direction. In this embodiment, the recessed part 15 for inserting the magnet 12 by the adjacent arc-shaped electromagnetic steel sheet 21 is formed to be depressed outward in the radial direction. In FIG. 4, the divided surfaces of the adjacent arc-shaped electromagnetic steel sheets 21, that is, the engagement positions of the concave portions 22 and the convex portions 23 are located on the radially outer side of the circumferential width center of the magnet 12. The engaging position of the convex part 23 can be set arbitrarily.

  As described above, according to the rotor 10 of the outer rotor type rotating machine according to the present embodiment, the rotor core 11A is composed of a plurality of annular substantially circular circles formed by combining a plurality of substantially arc-shaped electromagnetic steel plates 21 in the circumferential direction. Since the arc-shaped electromagnetic steel sheet 21 is configured by laminating in the rotation axis direction, when the rotor core is formed by punching the electromagnetic steel sheet, the electromagnetic wave that is wasted at the time of manufacture compared to the case of punching the annular electromagnetic steel sheet. The amount of the steel plate can be reduced, and the manufacturing cost of the rotor core 11A can be suppressed.

  In the embodiment shown in the figure, the example using the quadrangular prism-shaped magnet 12 is shown, but the arc-shaped magnet 12 similar to the second embodiment may be used.

(Third embodiment)
The rotor of the present embodiment is different from the rotor core of the first embodiment only in the configuration of the rotor core, and the other configurations are the same. Omitted.

  FIG. 5 is an enlarged view of a main part of the outer rotor type rotating machine of the third embodiment, and the rotor core 11B of the present embodiment is integrally formed from, for example, a low carbon steel such as JIS standard S10C (laminated electrical steel sheet). (Not) a substantially annular integrated yoke 25 and a plurality of reluctance projection forming members 26 formed by laminating a plurality of electromagnetic steel plates in the axial direction.

  The outer peripheral surface 25 a of the integral yoke 25 is formed in an annular shape, and is press-fitted into the edge inner peripheral surface 14 a of the rotor cup 14. Further, on the inner peripheral surface of the integral yoke 25, a plurality of flat portions 25b with which the outer peripheral surface 12a of the magnet 12 abuts and a plurality of concave grooves 25c formed between the flat portions 25b adjacent in the circumferential direction are formed. Is done.

  The reluctance protrusion forming member 26 is formed with a rotor core taper surface 16 on both sides in the circumferential direction and a connecting portion 18 formed in a tapered shape from the rotor core taper surface 16, and a reluctance protrusion 17 is formed at the tip of the connecting portion 18. The base portion 26a and a pair of protrusion portions 26b that protrudes left and right (circumferential direction) on the outer side in the radial direction of the base portion 26a and engage with the groove 25c are configured.

  The rotor core 11B is integrally assembled by engaging the reluctance projection forming member 26 with the concave groove 25c of the integral yoke 25 from the axial direction. Accordingly, the inner peripheral surface of the rotor core 11B is recessed radially outward by the side surface of the reluctance protrusion forming member 26 adjacent in the circumferential direction on the inner peripheral surface of the integral yoke 25 and the flat portion 25b of the integral yoke 25. A recess 15 is formed. The inner circumferential wall surface of the recess 15 is a rotor core taper surface 16 formed on the base portion 26 a of the reluctance projection forming member 26 and reliably engages with the magnet taper surfaces 12 c and 12 d of the magnet 12.

  The rotor cup 14 may be formed integrally with the integral yoke 25 by casting or forging. In this case, the step of press-fitting the integral yoke 25 into the rotor cup 14 becomes unnecessary. Further, the magnet 12 may be an arc-shaped magnet. In this case, the inner peripheral surface of the integral yoke 25 is formed in an arc shape.

  As described above, according to the rotor 10 of the outer rotor type rotating machine according to the present embodiment, the rotor core 11B is formed by laminating the substantially annular integrated yoke 25 and a plurality of electromagnetic steel plates in the rotation axis direction. Since the reluctance protrusion forming member 26 is formed, the manufacturing cost can be reduced as compared with the case where the rotor core 11 is formed by laminating a plurality of annular electromagnetic steel plates in the axial direction. Further, since the reluctance protrusion 17 is close to the opposing teeth 3b, eddy current loss is likely to occur due to the magnetic flux passing through the reluctance protrusion 17, but the reluctance protrusion forming member 26 is formed by laminating a plurality of electromagnetic steel plates. Therefore, the eddy current loss generated by the magnetic flux passing through the reluctance protrusion 17 can be reduced.

In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the present embodiment, the engaging portion and the non-engaging portion are configured with tapered surfaces, but the present invention is not limited thereto, and may be configured with, for example, a convex portion and a concave portion. Any structure can be adopted as long as the structure prevents the above.

DESCRIPTION OF SYMBOLS 1 Outer rotor type rotary machine 2 Stator 3 Stator core 3b Teeth 10 Rotor 11, 11A, 11B rotor core 12 Magnet 12c, 12d Magnet taper surface (engagement part) of outer rotor type rotary machine
13 Rotating shaft 14 Rotor cup (holding member)
15 Recess 16 Rotor core taper surface (engaged part)
17 Reluctance protrusion (convex)
21 Arc-shaped electromagnetic steel plate 25 Integrated yoke 26 Reluctance protrusion forming member (convex portion forming member)
A Distance of the magnetic gap between the circumferential end of the flat surface of the reluctance protrusion and the circumferential end of the inner circumferential surface of the magnet B The circumferential end of the inner circumferential surface of the magnet and the outer circumferential surface of the teeth of the stator core The maximum distance C of the radial gap between the rotors The rotation center g of the rotor G Magnetic air gap L The straight line P1 passing through the center of the circumferential width of the magnet and the rotation center of the rotor The circumferential end P2 of the flat surface of the reluctance protrusion A circumferential end portion T of the teeth A straight line passing through the center of the teeth in the circumferential direction and the rotation center of the rotor

Claims (6)

A substantially annular rotor core;
A plurality of magnets fixed to the inner peripheral surface of the rotor core;
A holding member that holds the rotor core from the outside in the radial direction and is fixed to the rotating shaft;
In a rotor of an outer rotor type rotating machine that faces a stator arranged radially inside via a predetermined gap,
The rotor core is formed with a plurality of recesses recessed radially outward on the inner peripheral surface to accommodate the magnet,
The magnet has engaging portions on both circumferential end surfaces,
The rotor of an outer rotor type rotating machine, wherein the concave portion has an engaged portion that engages with the engaging portion on an inner wall surface facing in the circumferential direction. The engaging portion is a magnet taper surface formed so that the circumferential width of the magnet increases as it goes radially outward along a straight line passing through the circumferential width center of the magnet and the rotation center of the rotor. ,
2. The outer rotor type according to claim 1, wherein the engaged portion is a rotor core taper surface formed on an inner wall surface facing in the circumferential direction of the recess so as to engage with the magnet taper surface. The rotor of the rotating machine. Between the concave portions adjacent to each other in the circumferential direction of the rotor core, a convex portion protruding radially inward is formed,
The rotor of the outer rotor type rotating machine according to claim 1, wherein a magnetic gap is formed between the convex portion and the magnet.   The distance of the magnetic gap between the circumferential end portion of the convex teeth facing surface and the circumferential end portion of the magnet teeth opposing surface is the distance between the opposing teeth facing surface of the magnet and the stator teeth. 4. The rotor of an outer rotor type rotating machine according to claim 3, wherein the rotor is larger than a maximum distance of radial gaps formed therebetween. The rotor core is configured by laminating a plurality of annular electromagnetic steel plates in the rotation axis direction,
The rotor of an outer rotor type rotating machine according to any one of claims 1 to 4, wherein each of the electromagnetic steel plates is configured by combining a plurality of substantially arc-shaped electromagnetic steel plates. The rotor core is
It is composed of a substantially annular integral yoke, and a convex portion forming member formed by laminating a plurality of electromagnetic steel plates in the rotation axis direction,
The rotor of an outer rotor type rotating machine according to claim 3 or 4, wherein the convex portion forming member has the convex portion.

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