JPH08223835A - Permanent magnet rotor - Google Patents

Abstract

PURPOSE: To fix segment magnets on the rotor yoke of a permanent magnet rotor, by the structure which has a resistance to the high-speed rotation of the rotor and can deal with the increased size of the rotor too while the generation of the leakage magnetic flux of the rotor is suppressed as much as possible, in the rotor wherein the segment magnets are provided respectively in a plurality of positions of the outer surface of the cylindrically formed rotor-yoke at equal spaces in its circumferential direction. CONSTITUTION: On the outer surface of a rotor yoke 211 , a plurality of protruding parts 25, extended in its axial direction are provided in a plurality of positions present at equal spaces in its circumferential direction, while recessed parts 26 are formed respectively between the respective adjacent protruding parts 251 . Further, with a cover 271 formed of a non-magnetic metallic material wherein respective segment magnets 241 are stored engagement-wise, the respective protruding parts 251 are engaged. Also, over the whole length of the cover 271 extended along the axial line of the rotor yoke 211 , the cover 271 is coupled directly to the rotor yoke 211 .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet rotor in which segment magnets are fixed and arranged at a plurality of circumferentially equidistantly spaced locations on the outer surface of a rotor yoke formed in a cylindrical shape. .

[0002]

2. Description of the Related Art Conventionally, such a rotor is already known from, for example, Japanese Utility Model Publication No. 2-18659 and Japanese Utility Model Publication No. 4-10550.

[0003]

However, in the above-mentioned prior art, the segment magnets are provided in the plurality of positioning recesses extending in the axial direction at a plurality of positions equidistantly spaced in the circumferential direction on the outer surface of the rotor yoke. It is positioned and fitted,
A protrusion provided on the rotor yoke is interposed between the positioning recesses between the adjacent segment magnets. Therefore, the apparent magnetic force is reduced due to the generation of a relatively large number of leakage magnetic fluxes between the N and S poles of the adjacent segment magnets, which may lead to a reduction in performance.

In order to solve such a problem, in order to make the N-S pole magnetic path of the adjacent segment magnets relatively wide,
It is conceivable to fix and arrange the segment magnets respectively on a plurality of protrusions extending in the axial direction at a plurality of locations at equal intervals in the circumferential direction on the outer surface of the rotor yoke.
47 and JP-A-60-35946,
Such a configuration is adopted. However, these publications (Japanese Utility Model Laid-Open No. 3-77247, JP-A-60-359).
No. 46), a plurality of pressers, which are fitted in the recesses formed between the protrusions of the rotor yoke and press the segment magnets on both sides, are spaced along the axis of the rotor yoke. The yoke rotor is screwed at a certain point, and the force for fixing each segment magnet to the rotor yoke is relatively weak, and there is a problem in the resistance to the centrifugal force generated in the segment magnet due to the high speed rotation of the rotor. .

Therefore, a technique in which each segment magnet is covered from the outer peripheral side and fixed to the rotor yoke is disclosed in, for example, Japanese Patent Laid-Open Nos. 60-156248 and 57-57.
It is disclosed in Japanese Patent Publication No. 173364. In Japanese Patent Laid-Open No. 60-156248, a string-shaped body made of resin-impregnated glass fiber is wound around a rotor. However, since the string-shaped body contains a resin, fatigue, high temperature deterioration, etc. There are problems and it is hard to say that it is reliable. Further, in JP-A-57-173364, segment magnets are arranged on the inner circumference of a cylindrical cover made of a non-magnetic material, and a rotor yoke is press-fitted into these segment magnets. According to this structure, the segment magnets are reliably fixed to the rotor yoke, but strict dimensional accuracy is required when the size of the rotor is increased, and it is difficult to apply the large size rotor.

The present invention has been made in view of the above circumstances, and has a yield strength capable of supporting high-speed rotation as well as a large-sized rotor while suppressing the generation of leakage magnetic flux as much as possible. An object of the present invention is to provide a permanent magnet type rotor having a structure in which a segment magnet can be fixed to a rotor yoke.

[0007]

In order to achieve the above-mentioned object, the invention as claimed in claim 1 has a plurality of segments formed at a plurality of positions equidistant in the circumferential direction on the outer surface of a rotor yoke formed in a cylindrical shape. In a permanent magnet rotor in which magnets are respectively fixed and arranged, a plurality of protrusions extending in the axial direction are formed on the outer surface of the rotor yoke at a plurality of positions equally spaced in the circumferential direction. The protrusions are fitted to the cover, which is formed by forming concave portions between them, and which is made of a non-magnetic metal material and fits and accommodates the segment magnets, and extends over the entire length of the cover along the axis of the rotor yoke. The cover is directly connected to the rotor yoke.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the protrusions are fitted to a plurality of covers in which the segment magnets are individually fitted and housed. The side edges of each cover are welded to the rotor yoke on both sides of each protrusion.

According to a third aspect of the present invention, in addition to the configuration of the first aspect of the invention, the protrusions are fitted to a plurality of covers in which the segment magnets are individually fitted and housed. The rotor yoke is provided with caulking protrusions each having a groove formed on each side thereof to form a caulking deformation portion and extending in the axial direction of the rotor yoke. The both caulking protrusions are caulked to the side edges of the covers that are adjacent to each other along the circumferential direction of the.

[0010]

According to the structure of the invention described in claim 1, the segment magnet housed and fitted in the cover made of the non-magnetic metal material is positioned and arranged on the projection by fitting the projection to the cover. Therefore, it is possible to suppress the generation of the leakage magnetic flux between the N and S poles of the adjacent segment magnets as much as possible, and prevent the performance deterioration due to the generation of the leakage magnetic flux. In addition, the cover is directly coupled to the rotor yoke along the entire length of the cover along the axis of the rotor yoke, so that the segment magnets have the proof strength to withstand the centrifugal force at the time of high-speed rotation and are securely fixed on the protrusions. In addition, since the torque generated by the segment magnets is directly transmitted from the cover to the protrusion, the torque load on the connecting portion is reduced and high torque can be transmitted. Moreover, even if the rotor becomes large,
It is not necessary to strictly determine the dimensional accuracy of the protrusion and the cover.

Further, according to the configuration of the invention described in claim 2, since the side edges of the plurality of covers are welded to the rotor yoke on both sides of each protrusion, the thermal strain due to welding adversely affects the segment magnets. By avoiding this, the cover can be firmly fixed to the rotor yoke.

Further, according to the configuration of the invention described in claim 3, the caulking deformed portion of the tip of the caulking protrusion provided in the recess between the protrusions is caulked to the side edge of each cover. The cover can be firmly fixed to the rotor yoke by avoiding as much as possible the adverse effect of the stress strain due to the caulking on the segment magnets.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention. FIG. 1 is a front view of a permanent magnet type rotor, and FIG.
2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is an enlarged sectional view showing a structure for fixing the segment magnets to the rotor yoke.

First, referring to FIGS. 1 and 2, the permanent magnet type rotor has a rotor yoke 21 ₁ made of a magnetic metal and formed in a cylindrical shape with both ends closed, and coaxially provided at both ends of the rotor yoke 21 _1. Rotor shafts 22 and 23 coupled to the rotor yoke 21 and a plurality of segment magnets 24 fixed and arranged at a plurality of positions on the outer surface of the rotor yoke 21 ₁ at equal intervals in the circumferential direction.
_It consists of ₁ , 24 ₁ ...

Referring also to FIG. 3, the rotor yoke 21
_On the outer surface of ₁ , a plurality of projections 25 ₁ , 25 _1, ... Which extend in the axial direction at a plurality of locations equidistantly arranged in the circumferential direction are provided between the projections 25 ₁ , 25 _1, ... 26 are formed respectively. Each segment magnet 24 ₁ ,
24 ₁ are formed in the shape of a rod having a substantially rectangular cross section, and are individually positioned and fixed on the protrusions 25 ₁ , 25 _1, ... By corresponding covers 27 ₁ , 27 ₁ .

[0017] Cover 27 ₁ includes a pressing plate portion 28 abutting against the outer surface of the segment magnets 24 ₁ on the projections 25 _1, so as to abut against the both side surfaces of the both side surfaces and projections 25 ₁ of the segment magnets 24 ₁ On both sides of the pressing plate 28
Side plate portions 29, 29, one end of which is continuously provided via 1, 31
And the recesses 26, 2 that are connected to the other ends of the side plate portions 29, 29.
A cover 27 ₁ in a state in which the segment magnet 24 ₁ is fitted and housed and which is formed of a non-magnetic metal material and has a substantially U-shaped cross section. It is possible to fit the protrusion 25 ₁ until the collar portions 30, 30 come into contact with the bottoms of the recesses 26, 26. As the non-magnetic metal material forming the cover 27 ₁ , aluminum alloy, stainless steel, etc. are used.
CONEL625LCF (trade name) is preferably used.

By the way, the cover 27₁The pressing plate portion 28 of
The connecting portions 31, 31 connecting the both side plate portions 29, 29 are outward
Formed to have an arcuate cross-sectional shape that bulges to the side
The segment magnet 24₁Mated and stored
Cover 27 in a state₁The collar portions 30, 30 are concave portions 2
Projection 25 until it abuts the bottom of 6, 26₁Mated with
In this case, when the connecting portions 31 and 31 are bent, the pressing plate portion 2
8 is a segment magnet 24 ₁The protrusion 25₁One that pushes to the side
Demonstrate the elastic force of the direction and the segment magnet 24₁Abut
Will be.

Further, the connecting portion 3 of the segment magnet 24 ₁
The corners facing 1 and 31 are rounded in an arc shape in order to prevent the segment magnet 24 ₁ from cracking. Moreover, the segment magnet 24 ₁ and the cover 2
In order to avoid stress concentration at the corners due to the difference in thermal expansion of 7 ₁ , gaps 32, 32 are set between the connecting portions 31, 31 and the corners of the segment magnet 24 ₁ . .

The plurality of covers 27 ₁ , 27 ₁ ... In which the segment magnets 24 ₁ , 24 ₁ ...
The protrusion 25 corresponding to the inside of those covers 27 ₁ , 27 ₁ ...
_In the state in which ₁ , 25 ₁ ... Are fitted, they are respectively welded to the recesses 26, 26 ... of the rotor yoke 21 ₁ . That is, the flange portions 30, 30 of the covers 27 ₁ , 27 ₁ adjacent to each other are brought into contact with the bottom of the recess 26 with their side edges facing each other, and are rotated by the laser beam or electron beam from the torch 33. Both flange portions 30, 30 are continuously welded to the rotor yoke 21 ₁ over the entire length of the child yoke 21 ₁ along the axial direction.

In order to secure such strength of the welded portion, the base end portion of the projection 25 ₁ is formed so that the cross-sectional shape thereof is an arcuate shape convex inward, and the cover 27 ₁ The connecting portion of the side plate portion 29 and the collar portion 30 in is also formed in an arc shape so as to smoothly contact the base end portion.

Next, the operation of the first embodiment will be described. A plurality of covers 27 ₁ and 2 made of a non-magnetic metal material.
Segment magnets 2 housed and fitted in 7 ₁ respectively
4 _1, 24 ₁ ... are projections 25 _1, 25 ₁ ... cover 27 ₁ is fitted, respectively, 27 ₁ ... rotor yoke 21 ₁
, Are positioned and fixed on the respective projections 25 ₁ , 25 ₁ , ... Having the recesses 26, 26. Therefore, the segment magnets 24 ₁ adjacent 24 ₁ ... without the magnetic metal is interposed between, minimizing the occurrence of leakage flux in the adjacent segment magnets 24 _1, 24 ₁ ... N-S machining gap of, It is possible to prevent performance deterioration due to generation of leakage magnetic flux.

Further, the projections 25 ₁ , 25 extend over the entire length of the covers 27 ₁ , 27 _1, ... Along the axis of the rotor yoke 21 _1.
The covers 27 ₁ , 27 ₁ on both sides of the rotor ₁ are welded to the rotor yoke 2 by continuous laser beam welding or electron beam welding.
It is directly connected to 1 ₁ . For this reason, pressers that fit into the recesses formed between the protrusions of the rotor yoke and press the segment magnets on both sides are screwed to the yoke rotor at multiple locations spaced along the axis of the rotor yoke. Compared with the prior art (Japanese Utility Model Laid-Open No. 3-77247 and Japanese Patent Laid-Open No. 60-35946), the cover 27 ₁ ,
27 _1, that is, the segment magnets 24 ₁ , 24 ₁ can be firmly fixed to the rotor yoke 21 _1, and can sufficiently withstand the centrifugal force generated in the segment magnets 24 ₁ , 24 _{1 as} the rotor rotates at high speed. Proof strength can be secured.

[0024] Moreover the segment magnets 24 _1, 24 ₁ ... cover 27 ₁ generated torque of 27 ₁ ... from the protruding section 25 _1,
Transmitted 25 ₁ ... directly to the cover 27 _1, 27 ₁ ... it is possible to reduce the torque load on the coupling portion of the rotor yoke 21 _1, it is possible to transmit high torque.

Further, segment magnets 24 ₁ , 24 _1, ...
Are provided with individual covers 27 ₁ , 27 _1, ...
5 ₁ , 25 _1, ... Positioned and fixed on top of each of the protrusions 2 even if the rotor yoke 21 ₁ is upsized.
It is not necessary to determine the dimensional accuracy of 5 ₁ , 25 ₁ ... And the covers 27 ₁ , 27 ₁ ... So strictly, and it is possible to easily cope with the increase in size of the rotor.

Moreover, each cover 27₁, 27₁... is each protrusion
25₁, 25₁The rotors are not connected due to the recesses 26, 26 between them.
Ark 21₁Since it is to be welded to₁,
25 ₁… Segment magnet 24 above₁, 24₁On ...
Avoid the adverse effects of thermal strain associated with welding,
Cover 27₁, 27₁... is the rotor yoke 21₁Firmly
Can be fixed.

If the cover 27 ₁ is made of austenitic stainless steel, eddy current loss may occur due to its low electrical resistivity. In such a case, in order to reduce the eddy current loss, May be provided with a plurality of holes 34, 34 ... In the pressing plate portion 28 of the cover 27 _{1 as} in the first modification shown in FIG. 4, or as in the second modification shown in FIG. cover 27 ₁ may also be a plurality of slits 35, 35 ... it is provided on the pressing plate portion 28 of the further pressing plate portion 28 and the side plates 2 of the cover 27 ₁ as in the third modification shown in FIG. 6
A plurality of holes 36, 36 ... May be provided between 9, 29.

FIG. 7 shows a second embodiment of the present invention, and the portions corresponding to those of the first embodiment are designated by the same reference numerals.

A plurality of protrusions 25 ₁ and 2 provided at a plurality of positions at equal intervals in the circumferential direction on the outer surface of the rotor yoke 21 _1.
The 5 ₁ ... top, collision with one or more positioning recesses 37 on the outer surface side is segment magnets 24 _2, 24 ₂ ... is arranged, which is provided, each segment magnet 24 _2, 24 ₂ ... the fitting, is housed Covers 27 ₂ , 27 ₂ welded to the rotor yoke 21 ₁ in the same manner as the cover 27 ₁ of the first embodiment with the parts 25 ₁ , 25 _1, ...
Are provided with positioning protrusions 38 that fit into the positioning recesses 37.

According to the second embodiment, in addition to the effect of the first embodiment, the segment magnets 24 ₂ , 24 ₂ ... Are surely moved in the direction along the axis of the rotor yoke 21 _1. Can be prevented.

[0031] FIG. 8 shows a third embodiment of the present invention, a plurality of projections 25 ₁ provided at a plurality of locations spaced at equal intervals in the circumferential direction of the outer surface of the rotor yoke 21 _1, 25 ₁ The segment magnets 24 ₁ , 24 ₁ ... are arranged on the above, and the segment magnets 24 ₁ , 24 ₁ ... are fitted and housed and the projections 25 ₁ , 25 ₁ ... It is on the cover 27 _3, 27 ₃ ... are welding as with the cover 27 of the _first embodiment the rotor yoke 21 _1, the segment magnets 24 ₁ along the rotor yoke 21 _first axis,
A pair of engaging collars 39 that engage with both ends of 24 ₁ ...
39 are provided respectively.

According to the third embodiment, the same effect as that of the second embodiment can be obtained.

[0033] FIG. 9 shows a fourth embodiment of the present invention, a plurality of projections provided at a plurality of locations spaced at equal intervals in the circumferential direction of the outer surface of the rotor yoke 21 ₂ 25 _2, 25 ₂ In addition, locking projections 40, 40 for engaging both ends of the segment magnets 24 ₁ , 24 _1, ... Are provided at both ends along the axis of the rotor yoke 21 ₂ , respectively. As in the second and third embodiments, it is possible to reliably prevent the segment magnets 24 ₁ , 24 _1, ... From moving in the axial direction of the rotor yoke 21 ₂ .

FIG. 10 shows a fifth embodiment of the present invention, and the portions corresponding to the respective embodiments described above are designated by the same reference numerals.

Rotor yoke 21₃Equidistant in the circumferential direction on the outer surface of
In multiple places separated by a gap, it becomes narrower toward the outside.
The rotor yoke 21 has a trapezoidal horizontal cross section.
₃25 extending in the axial direction of the₃, 25₃… But those
Protrusion 25₃, 25₃... and recesses 26 ', 26' ...
Each protrusion 25 is formed and provided.₃, 25₃Beyond
The width of the end is 25₃, 25₃… Positioned on
Segment magnet 24 ₁, 24₁Set larger than the width of
It is fixed.

On the other hand, each segment magnet 24 ₁ , 24 _1, ...
The projections 25 _3, 25 ₃ ... cover 27 for positioning and fixing to the upper _4, 27 ₄ ... comprises a pressing plate portion 28 abutting against the outer surface of the segment magnets 24 ₁ on the projections 25 _3, projection 25
_The side plate portion 2 having one end continuously connected to both side ends of the pressing plate portion 28 via the connecting portions 31 and 31 so as to abut both side surfaces of the side plate portion 2.
9'and 29 ', and collar parts 30 and 30 which are continuously provided on the other ends of the side plate parts 29' and 29 'and contact the bottoms of the recesses 26' and 26 '.
And adjacent covers 27 ₄ and 27 ₄
The side edges of the collar portions 30, 30 facing each other are welded to the recess 26 '.

Even with the cover 27 _{3 having} such a shape, the segment magnet 24 ₁ can be securely fixed to the rotor yoke 21 ₃ as in the above embodiments.

FIG. 11 shows a sixth embodiment of the present invention, which is a cover 27 ₅ for positioning and fixing the segment magnet 24 ₁ to the projection 25 ₁ on the outer surface of the rotor yoke 21 _1.
Is a pressing plate portion 28 abutting on the outer surface side of the segment magnet 24 ₁ on the protruding portion 25 ₃ and connecting portions 31, 31 on both side ends of the pressing plate portion 28 so as to abut on both side surfaces of the protruding portion 25 _1. It is provided with side plate portions 29 ″ and 29 ″, one end of which is continuously provided via the end portion of the side plate portions 29 ″ and 29 ″.
Welded on both sides of ₁ .

According to the sixth embodiment, the cover 27 ₅ has a simpler shape, and the cover 27 ₅ can be welded to the rotor yoke 21 ₁ more easily.

[0040] As a seventh embodiment of the present invention, as shown in Figure 12, comprising a plurality of cover portions 27a that has a shape corresponding to the cover 27 _{1-27 5} in the above embodiment, 27a ... is continuously provided The belt-shaped cover 27 ₆ is attached to the rotor yoke 21.
_It may be connected to ₁ , in which case each protrusion 25
_1, 25 ₁ ... to a rotor yoke 21 ₁ in which a segment magnet 24 _1, 24 ₁ ... disposed thereon, each of the segment magnets 24 _1, 24 ₁ ... and protrusion 25 _1, 25 ₁ ... each The cover 27 ₆ is wound so as to be fitted into the cover portions 27a, 27a ..., And both longitudinal ends of the cover 27 ₆ are covered by the torch 33 by the torch 33 over the entire length in the axial direction of the rotor yoke 21 _1. It is continuously welded to the recess 26 of 21 ₁ .

FIG. 13 shows an eighth embodiment of the present invention, and the portions corresponding to the respective embodiments described above are designated by the same reference numerals.

Rotor yoke 21₁The recesses 26 of ...
Groove 42 forming caulking deformation portions 43, 43 on the side
With a rotor yoke 21 at the tip.₁Along the axial direction of
Each of the extending crimping protrusions 41 is provided. Thus each
Segment magnet 24₁, 24 ₁... fitted and stored individually
Multiple covers 27₁, 27₁... and rotor yoke 21
₁Each protrusion 25₁, 25₁The state that they are fitted together
And the covers 27 that are adjacent to each other₁, 27₁Collar part 30,
30, a caulking jig 44 that fits into the groove 42 from above is provided.
Therefore, when the caulking protrusion 41 is pressed, plastic deformation is caused.
Both of the crimped deformed portions 43, 43 are crimped and coupled.

[0043] According to the eighth embodiment, caulking by can be strongly bonded to the cover 27 ₁ to the rotor yoke 21 _1, in which, that stress strain due to caulking adversely affect the segment magnets 24 ₁ It can be avoided as much as possible.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible.

[0045]

As described above, according to the first aspect of the present invention, the outer surface of the rotor yoke is provided with a plurality of protrusions extending in the axial direction at a plurality of positions equally spaced in the circumferential direction. The protrusions are fitted to the cover, which is provided by forming recesses between the protrusions, respectively, and which is made of a non-magnetic metal material and into which the segment magnets are fitted and housed, along the axis of the rotor yoke. Since the cover is directly coupled to the rotor yoke over the entire length of the cover, the N of adjacent segment magnets is
-It is possible to prevent the generation of leakage flux between the S poles as much as possible to prevent performance deterioration due to the generation of leakage flux, and the segment magnets have the proof strength to withstand the centrifugal force during high-speed rotation. Since it is securely fixed, the torque load on the joint of the cover to the rotor yoke can be reduced and high torque can be transmitted, and it is not necessary to strictly determine the dimensional accuracy of the protrusion and the cover, thus increasing the size of the rotor. Can be easily dealt with.

According to a second aspect of the present invention, in addition to the structure of the first aspect of the present invention, each protrusion is fitted to each of a plurality of covers in which the segment magnets are individually fitted and housed. Since the side edges of each cover are welded to the rotor yoke on both sides of each protrusion, thermal distortion due to welding does not adversely affect the segment magnets, and the cover is firmly fixed to the rotor yoke. be able to.

Further, according to the invention of claim 3, in addition to the structure of the invention of claim 1, each projection is fitted to a plurality of covers in which the segment magnets are individually fitted and housed. The rotor yoke is provided with caulking protrusions each having a groove formed on each side thereof to form a caulking deformation portion and extending in the axial direction of the rotor yoke. Since both of the caulking projections are caulked to the side edges of the cover which are adjacent to each other along the circumferential direction of the cover, the cover is rotatably prevented by avoiding the adverse effect of the stress strain due to the caulking on the segment magnets. It can be firmly fixed to the yoke.

[Brief description of drawings]

FIG. 1 is a front view of a permanent magnet rotor of a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view showing a structure for fixing a segment magnet to a rotor yoke.

FIG. 4 is a perspective view showing a first modification of the cover of the first embodiment.

FIG. 5 is a perspective view showing a second modification of the cover of the first embodiment.

FIG. 6 is a perspective view showing a third modification of the cover of the first embodiment.

FIG. 7 is a sectional view of a second embodiment corresponding to FIG.

FIG. 8 is a sectional view of a third embodiment corresponding to FIG.

FIG. 9 is a sectional view of a fourth embodiment corresponding to FIG.

FIG. 10 is a cross-sectional view of essential parts of a fifth embodiment.

FIG. 11 is a cross-sectional view of essential parts of a sixth embodiment.

FIG. 12 is a front view showing a cover welding step of the seventh embodiment.

FIG. 13 is a cross-sectional view of essential parts of an eighth embodiment.

[Explanation of symbols]

21 _{1 to} 21 ₃ ... Rotor yoke 24 ₁ , 24 ₂ ... Segment magnets 25 _{1 to} 25 ₃ ... Projection portion 26, 26 '... Recessed portion 27 _{1 to} 27 ₆ ... Cover 41. ..Caulking protrusions 42 ... Grooves 43 ... Caulking deformed portions

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Takeshi Yamagami 1-4-1, Chuo, Wako-shi, Saitama Inside Honda R & D Co., Ltd. (72) Inventor Kazuo Ando 1-4-1, Chuo, Wako-shi, Saitama Incorporated company Honda Technical Research Institute (72) Inventor Manabu Murakami 1-4-1 Chuo, Wako City, Saitama Prefecture Incorporated Honda Technical Research Institute (72) Inventor Koji Ueda 1-14-1 Central, Wako City, Saitama Prefecture Stock Company Honda Technical Research Institute

Claims (3)

[Claims] 1. A rotor yoke (21) formed in a cylindrical shape.
₁~ 21₃) Multiple locations on the outer surface at even intervals in the circumferential direction
The segment magnet (24₁, 24₂) Is solid
In a fixed permanent magnet rotor, the rotor yaw
Ku (21₁~ 21₃) On the outer surface, evenly spaced in the circumferential direction
A plurality of protrusions (25₁
~ 25₃) But their protrusions (25₁~ 25₃Between each other
And the recesses (26, 26 ') are formed in the
Each segment magnet (2
4₁, 24₂) Is fitted and stored in the cover (27₁~ 2
7 ₆) Each protrusion (25₁~ 25₃) Is fitted and the rotor
York (21₁~ 21₃) Cover along the axis (27)₁
~ 27₆) The cover (27₁~ 2
7₆) Is the rotor yoke (21₁~ 21₃) Directly
A permanent magnet rotor characterized in that Wherein each segment magnet (24 _1, 24 ₂₎ individually fitting, a plurality of cover is housed (27 21 _to
7 ₅ ) are fitted with the respective projections (251 to 25 ₃ ), and the side edges of the respective covers (27 _{1 to} 27 ₅ ) are fitted to the projections (25 ₁ ).
Rotor yoke (21 _{1 to} 21 ₃ ) on both sides of _{1 to} 25 ₃ )
The permanent magnet rotor according to claim 1, which is welded to the rotor. 3. A plurality of covers (27 ₁ ) in which the segment magnets (24 ₁ ) are individually fitted and housed are provided with respective protrusions (25).
₁ ) are respectively fitted, and the recesses (26) between the respective projections (25 ₁ ) have grooves (42) at both ends thereof which form caulking deformation portions (43) on both sides, and the rotor (2). Caulking protrusion (41) extending along the axial direction of the yoke (21 ₁ ).
Are provided respectively, and the both caulking projections (43) are caulked to the side edges of the covers (27 ₁ ) adjacent to each other along the circumferential direction of the rotor yoke (21 ₁ ). The permanent magnet rotor according to claim 1.