JP2003299280A - Permanent magnet rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent magnet rotor which surely holds a permanent magnet in a slot while productivity is improved by facilitating its manufacture. <P>SOLUTION: The permanent magnet rotor comprises a yoke 14a made of a laminated steel sheet 100 and rotatably provided adjacently to a stator. In this rotor, the yoke is perforated with a slot 14c for housing a field permanent magnet 16. The magnet 16 is covered with a coating material to form a coating layer 24, a freely cuttable protrusion 24a is formed at an outside of the layer 24. Thus, when the magnet 16 is inserted into and housed in the slot 14c, the protrusion 24a is housed in the slot 14c by cutting and engaging the protrusions 24a by an inner wall surface 14c1 of the slot. <P>COPYRIGHT: (C)2004,JPO

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, and more particularly to a permanent magnet mounting structure for a rotor such as a brushless motor.

[0002]

2. Description of the Related Art In a permanent magnet rotor having a yoke made of laminated steel plates and a slot in which a permanent magnet for a field is to be accommodated, a permanent magnet is prevented from being damaged or missing during rotation. It is necessary to securely hold the permanent magnet in the slot.

[0003] From that intention, the actual exploitation 58-172376
In the technique described in the publication, it is proposed that the outer circumference of the permanent magnet is covered with resin and that the permanent magnet is machined and accommodated according to the shape and size of the slot. Further, the technique described in Japanese Patent No. 2748694 proposes a configuration in which a plastically deformable protrusion is formed in a slot and the permanent magnet is held by the protrusion.

[0004]

However, in the technique disclosed in Japanese Utility Model Laid-Open No. 172376/1983, the amount of modification obtained by machining a resin-coated permanent magnet is small, so that the slot and It was necessary to strictly control the shape and size of the permanent magnet. That is, when a yoke is die-cut from a laminated steel sheet to form a slot, a certain level difference occurs between the steel sheets, and therefore a step of polishing and finishing after die-cutting is required, resulting in a decrease in productivity. There was such inconvenience.

Further, in the technique described in Japanese Patent No. 2748694, it is necessary to form the plastically deformable protrusions in the slots as described above, and the protrusions may be deformed when die-cutting from the steel plate. There are
There is an inconvenience that the projection formed from the steel plate scrapes or scratches the surface of the permanent magnet.

Therefore, an object of the present invention is to eliminate the above-mentioned inconvenience, and in addition to being rotatably provided adjacent to the stator, it is provided with a yoke made of laminated steel plates and a permanent magnet for field magnet is provided in the yoke. To provide a permanent magnet rotor in which a slot to be housed is bored, the permanent magnet being surely held in the slot while facilitating production and improving productivity. It is in.

[0007]

According to a first aspect of the present invention, there is provided a yoke which is rotatably provided adjacent to a stator and which is made of laminated steel plates. In a permanent magnet rotor having a slot for accommodating a permanent magnet for magnetism, a coating layer is formed by coating the permanent magnet with a coating material,
When a convex portion that can be cut is formed on the outer side of the coating layer and thus the permanent magnet is inserted and accommodated in the slot, the convex portion is engaged with the inner wall surface of the slot while cutting and engaging the permanent magnet. The magnet was configured to be housed in the slot.

When the permanent magnet is coated with a coating material to form a coating layer and a convex portion which can be cut is formed on the outer side of the coating layer, the permanent magnet is inserted into the slot and accommodated therein.
The convex part is engaged with the inner wall surface of the slot while cutting, in other words, the permanent magnet and the slot are configured so as to have a difference in shape between the permanent magnet and the slot as a scraping allowance of the convex part. The permanent magnet can be housed in the slot without any gap and can be securely held therein. Further, since it is not necessary to perform mechanical processing, manufacturing is easy and productivity is improved, and cost can be reduced. Moreover, if a material that complements the gap due to the difference in thermal expansion between the permanent magnet and the slot is selected as the material of the covering material, the permanent magnet can be held in the slot more reliably even after it is housed in the slot.

According to a second aspect of the present invention, the convex portion is formed in a tapered shape so that the height of the convex portion is minimized at the insertion end of the permanent magnet.

Since the convex portion is formed in a tapered shape so that its height is minimized at the insertion end of the permanent magnet, insertion of the permanent magnet into the slot is facilitated and workability is improved. be able to.

According to a third aspect of the present invention, the protrusion is formed so as to be partially formed on at least one outer surface of the coating layer.

Since the convex portion is formed so as to be partially formed on at least one surface on the outer side of the coating layer, in addition to the above-mentioned effects, cutting of the convex portion on the inner wall surface of the slot is facilitated and permanent magnet The pressing force at the time of insertion into the slot can be reduced, and the amount of material used for the coating layer can be reduced.

According to a fourth aspect of the present invention, the permanent magnet is metal-plated to form a plating layer, and the coating layer is formed on the plating layer.

Since the permanent magnet is plated with metal to form the plating layer and the coating layer is formed on the plating layer, even when the permanent magnet is struck against the inner wall surface of the slot when it is inserted into the slot. A coating layer that is not damaged and receives centrifugal force by forming a plating layer on the surface on which centrifugal force acts most strongly, in other words, by not forming a coating layer there Can be effectively prevented from being damaged.

According to a fifth aspect of the present invention, the coating layer includes the remaining surface of the permanent magnet except the surface closest to the outer peripheral surface of the rotor when the permanent magnet is housed in the slot. And the convex portion is formed on a surface most distant from the outer peripheral surface of the rotor.

The coating layer excludes a surface that is closest to the outer peripheral surface of the rotor when the permanent magnet is housed in the slot, in other words, a surface on which the centrifugal force acts most during rotation.
In addition to the above-mentioned effects, the high-rotation permanent magnet rotor has a structure in which the convex portion is formed on the remaining surface of the permanent magnet and is formed on the surface farthest from the outer peripheral surface of the rotor. However, as described immediately above, damage to the coating layer can be effectively prevented by receiving the centrifugal force on the plated surface (layer) of the permanent magnet.

According to a sixth aspect of the present invention, the coating layer includes the remaining surface of the permanent magnet except the surface most distant from the outer peripheral surface of the rotor when the permanent magnet is housed in the slot. And the convex portion is formed on a surface closest to the outer peripheral surface of the rotor.

The coating layer is formed on the remaining surface of the permanent magnet except for the surface most distant from the outer peripheral surface of the rotor when the permanent magnet is housed in the slot, and the projections are
Since it is configured to be formed on the surface closest to the outer peripheral surface of the rotor, in addition to the above effects, centrifugal force can be received by the coating layer, and damage to the permanent magnet can be prevented.

According to a seventh aspect of the present invention, the coating material is made of at least one of resin and metal.

In addition to the above-mentioned effects, if a material which is at least one of resin and metal, for example, a material that complements the gap due to the difference in thermal expansion between the permanent magnet and the slot is selected as the material of the coating material, the permanent magnet is selected. Can be held there even more reliably after it has been housed in the slot.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view schematically showing a permanent magnet rotor according to one embodiment of the invention, which is disassembled into a rotor, a stator and the like. In the case of the illustrated example, the permanent magnet rotor is configured as a rotor for a brushless motor (AC synchronous motor).

In the drawings, reference numeral 10 indicates the brushless motor, and the brushless motor 10 is a stator 12
A rotor (rotor) 14 and a permanent magnet 16 to be housed in a slot (described later) of the rotor 14. Figure 2
The rotor 14 is housed in the stator 12, as shown in FIG.

Eighteen stator poles 12 a are provided on the inner circumference of the stator 12 so as to protrude toward the center of the stator 12.
A coil (not shown) is fitted to each of the stator magnetic poles 12a. Three protrusions 12b are provided on the outer peripheral side of the stator 12, and bolts (not shown) are inserted into holes formed in the protrusions 12b and fixed to a housing (not shown).

The rotor 14 is composed of a yoke 14a, and the yoke 14a is formed by laminating a large number of silicon steel plates as described later. The rotor 14 has twelve rotor magnetic poles 14b.
Are provided so as to face the stator magnetic pole 12a. A slot 14c is formed in each of the rotor magnetic poles 14b, and a permanent magnet 16 for field magnet is housed therein.

As described above, the rotor (rotor) 14 is rotatably provided adjacent to the stator 12, and includes the yoke 14a made of laminated steel plates, and the yoke 14a accommodates the permanent magnet 16 for the field. It is configured as a salient pole type permanent magnet rotor with a slot 14c to be formed.

The brushless motor 10 using the permanent magnet rotor constructed as described above is constructed as a thin inner rotor type brushless motor as a whole, and the bolt fastening portion 18a of the mounting surface 18 on the center side of the rotor 14 (see FIG. 2). Show)
Is bolted to one end of a crankshaft (not shown) of the vehicle engine, and the bolt fastening portion 20a (shown in FIG. 2) of the mounting surface 20 on the outer peripheral side of the rotor 14 is attached to the transmission (not shown). It is bolted and used as one of the drive sources for hybrid vehicles.

FIG. 3 is an enlarged plan view of the permanent magnet 16, FIG. 4 is a side view of the permanent magnet 16 as seen from above, and FIG. 5 is a sectional view taken along line VV of FIG.

As shown in the figure, the permanent magnet 16 has a rectangular shape in plan view and side view, and is formed in a substantially plate shape. The permanent magnet 16 is manufactured by sintering a rare earth metal such as neodymium, iron, or boron.

FIG. 6 is a schematic explanatory sectional view showing a state in which the permanent magnet 16 is accommodated in the slot 14c formed in the rotor 14, and FIG. 7 shows a state in which the permanent magnet 16 is inserted into the slot 14c. It is an explanatory cross-sectional schematic diagram. For convenience of illustration, the thickness of some portions is exaggerated in FIG. 6 and subsequent figures.

The characteristic feature of the rotor (rotor) 14 according to the present invention resides in that the permanent magnet 16 is securely held in the slot 14c formed in the rotor 14. Focus on and explain.

As shown in FIG. 13, the slot 14c is formed by punching out a yoke 14a formed by laminating a large number of silicon steel plates 100, but as shown in the drawing, a step 22 is involved in the die-cutting process. If the thickness of the steel plate 100 is 0.35 mm, the step 22 has a maximum size of about 40 μm, for example. Therefore, as proposed by the technique described in Japanese Utility Model Laid-Open No. 172376/1983, the outer circumference of the permanent magnet 16 is covered with the resin 10.
When it is covered with 2 and inserted into the slot 14c, the permanent magnet 1
6 hits the steel plate 100a or the like from which it projects, and it was difficult to insert it.

Therefore, the rotor (rotor) according to this application
In FIG. 14, as shown in FIGS. 6 and 7, the permanent magnet 16 is coated with a coating material made of a resin to form a coating layer 24, and a coating material forming the coating layer 24 is provided outside the coating layer 24 ( (Resin) is extended to form a convex portion 24a that can be cut, so that when the permanent magnet 16 is inserted and accommodated in the slot 14c, the convex portion 24a is cut by the inner wall surface 14c1a of the slot 14c and engaged. Let
In other words, the difference in shape and size between the permanent magnet 16 and the slot 14c is provided as a cutting allowance for the convex portion 24a, so that the permanent magnet 16 is securely housed and held in the slot 14c.

Specifically, as shown in FIG. 6 and FIG.
The convex portion 24 a is at least partially formed on at least one outer surface of the coating layer 24. More specifically, the coating layer 24 has a surface 16c that is closest to the outer peripheral surface 14d of the rotor 14 when the permanent magnet 16 is housed in the slot 14c.
In addition to being formed on the five surfaces of the permanent magnet 16 except for the above, the convex portion 24a is formed on the surface 16d that is farthest from the outer peripheral surface 14d of the rotor 14.

Further, as shown in FIG. 7, the convex portion 24a is formed in a tapered shape so that the height thereof is minimized at the insertion end of the permanent magnet 16 into the slot 14c. More specifically, the protrusion 24a has a tapered shape whose height is minimized at the insertion end of the permanent magnet 16 and is gradually increased, and is flat in the vicinity of the central portion of the permanent magnet 16. Then, it is formed so as to have a taper shape that decreases again toward the rear end.

Further, as shown in FIGS. 6 and 7, the convex portion 24a is formed into three rail shapes which extend along the insertion direction and are spaced apart from each other, and each of them is as described above. It is formed to have a tapered shape.

Further, the permanent magnet 16 is metal-plated to form the plating layer 26, and the coating layer 24 is formed on the plating layer 26. The plating layer 26 is formed of a metal material that increases the hardness of the permanent magnet 16 and is not damaged even when the permanent magnet 16 hits the protruding steel plate 100a during insertion, for example, a metal material such as nickel-iron system. It

Here, the material of the resin forming the coating layer 24 and the convex portion 24a will be described. It can be cut freely (excellent in machinability). In other words, the permanent magnet 16 and the slot 1 can be cut.
It is necessary to use a material that can have the difference in shape and size of 4c as a cutting allowance.

Further, as described above, when the brushless motor 10 is used in a hybrid vehicle, the brushless motor 10 is exposed to a high temperature, for example, a temperature of 150 ° C. or higher, and engine oil and the like also adhere. Further, the permanent magnet 16 has an attractive force. Therefore, it is necessary to select a resin that does not deteriorate with age even in such a use environment.

Further, a yoke 14a formed by laminating silicon steel plates 100 and a permanent magnet 1 formed by sintering a rare earth metal.
6 has a different coefficient of thermal expansion, the difference between expansion and contraction (difference in thermal expansion) caused by a change in temperature causes permanent magnet 16
There is a possibility that a gap may be generated between the inner wall surface 14c1 of the slot 14c and the permanent magnet 16 even after the space is accommodated in the slot 14c. Therefore, it is desirable that the resin also has a property of complementing voids due to such a difference in thermal expansion. In consideration of the above, as the material of the resin forming the coating layer 24 and the convex portion 24a, for example, a liquid crystal polymer type resin or a nylon type resin is used.

Thus, in this embodiment,
The permanent magnet 16 is coated with a coating material made of resin to form a coating layer 2
4 is formed on the outside of the coating layer 24,
By extending the coating material (resin) that constitutes
Since the convex portion 24a which can be cut is formed and the convex portion 24a is engaged with the inner wall surface 14c1 of the slot 14c while being cut, the permanent magnet 16 is accommodated in the slot 14c, in other words, the convex portion 24a. While shaving, permanent magnet 1
Since 6 is inserted into the slot 14c, the permanent magnet 16 can be inserted and accommodated in the slot 14c without a gap, and can be securely held therein.

Further, since it is not necessary to perform mechanical processing, the manufacturing is easy and the productivity is improved, and the cost can be reduced. Furthermore, by selecting the above-mentioned material as the resin, the permanent magnet 1
6 does not drop out of the slot 14c or be damaged.

Furthermore, by metal-plating the permanent magnet 16, even when the permanent magnet 16 is inserted into the slot 14c1 and hits the steel plate 100a protruding by the inner wall surface 14c1, the permanent magnet 16 is effectively prevented from being damaged. can do.

Further, the coating layer 24 is provided on the outer peripheral surface 1 of the rotor 14 when the permanent magnet 16 is housed in the slot 14c.
4 of the permanent magnet 16 except for the surface 16d closest to 4d
The surface 16d formed on the surface, in other words, the surface 16d on which the centrifugal force acts at the time of rotation is the plating layer 26 and is the inner wall surface 1 of the slot 14c.
Since it comes into direct contact with 4c1, it is possible to effectively prevent damage to the coating layer 24. When the brushless motor 10 is used in a hybrid vehicle, the rotation speed may reach a maximum of about 6000 rpm, but even at such a high rotation speed, it is possible to effectively prevent the coating layer 24 from being damaged. .

Further, since the projections 24a are formed in the shape of three rails and each of them is formed in a taper shape, the work for inserting the permanent magnet 16 into the slot 14c becomes easy. .

The number of rail-shaped convex portions 24a is not limited to three, and may be two or four or more. More specifically, the number of rail-shaped portions may be any number as long as the permanent magnet 16 can be stably inserted into the slot 14c. Further, needless to say, the tapered shape is not limited to the illustrated shape as long as it facilitates insertion.

FIGS. 8 and 9 are explanatory views similar to FIGS. 6 and 7, showing a second embodiment of the permanent magnet rotor according to the present invention.

The following description focuses on the points that differ from the first embodiment, and in the second embodiment,
Rather than the three rail shapes in which the convex portions 24a are spaced apart from each other, the entire surface of at least one outer surface of the coating layer 24, that is, the surface 16 farthest from the outer peripheral surface 14d of the rotor 14
It is configured to be entirely formed on d.

Although the shape of the convex portion 24a is slightly different accordingly, the convex portion 24a is tapered so that the height at the insertion end of the permanent magnet 16 becomes the minimum. It is similar to the case. The rest of the configuration is similar to that of the first embodiment, and the effect is also similar.

FIG. 10 is an explanatory view similar to FIG. 6, showing a third embodiment of the permanent magnet rotor according to the present invention.

The following description focuses on the differences from the first embodiment, and in the third embodiment,
The coating layer 24 is formed on the remaining five surfaces of the permanent magnet 16 except for the surface 16d that is most distant from the outer peripheral surface 14d of the rotor 14 when the permanent magnet 16 is housed in the slot 14c, and the convex portions 24a are , The surface 16c closest to the outer peripheral surface 14d of the rotor 14 is formed.

That is, since the coating layer 24 receives the centrifugal force, it is possible to prevent the permanent magnet 16 from being damaged. In the case of this embodiment, the maximum number of rotations is determined by the durability and stretchability of the coating layer 24 against the centrifugal force. The rest of the configuration is similar to that of the first embodiment.

FIGS. 11 and 12 are explanatory views similar to FIGS. 6 and 7 showing a fourth embodiment of the permanent magnet rotor according to the present invention.

The following description focuses on the points that differ from the first embodiment, and in the fourth embodiment,
As the coating material forming the coating layer 24 and the convex portion 24a, metal was used instead of resin. As with metal, what kind of metal is free to be cut, more specifically, excellent in machinability, has excellent resistance to aging deterioration, and has the property of complementing the generation of voids due to thermal expansion difference? Any material may be used, but, for example, aluminum is used.

The remaining structure is the same as that of the first embodiment, and the effect is also the same. Further, although the fourth embodiment is shown by replacing the resin with a metal in the configuration of the second embodiment, the resin may be replaced with a metal in the first embodiment.

The first to fourth embodiments are as described above.
It is rotatably provided adjacent to the stator 12, and
A slot 1 which is provided with a yoke 14a made of a laminated steel plate 100 and in which a permanent magnet 16 for a field is to be accommodated.
In the permanent magnet rotor (rotor 14) in which 4c is bored, the permanent magnet is coated with a coating material to form a coating layer 24, and a cuttable convex portion 24a is provided outside the coating layer 24. Therefore, when the permanent magnet 16 is formed and inserted into the slot 14c to be housed, the convex portion 2 is formed.
The permanent magnet 16 is housed in the slot 14c by engaging the inner wall surface 14c1 of the slot 4a while cutting.

Further, the convex portion 24a is formed in a tapered shape so that the height thereof is minimized at the insertion end of the permanent magnet 16.

The convex portion 24a is formed on the coating layer 24.
Is formed so as to be partially formed on at least one surface on the outside of the.

The permanent magnet 16 is plated with metal to form a plating layer 26, and the coating layer 24 is formed on the plating layer.

Further, the coating layer 24 is the permanent magnet 1
A surface 16c that is closest to the outer peripheral surface 14d of the rotor (rotor 14) when 6 is accommodated in the slot 14c.
Except for the remaining surface of the permanent magnet 16 (in other words, 5
And the convex portion 24a is formed on a surface 16d that is closest to the outer peripheral surface 14d of the rotor.

Further, the coating layer 24 is the permanent magnet 1
A surface 16 that is most distant from the outer peripheral surface 14d of the rotor (rotor 14) when 6 is stored in the slot 14c.
Except for d, it is formed on the remaining surface of the permanent magnet, and the convex portion 24a is formed on the surface 16c closest to the outer peripheral surface of the rotor.

Further, the coating material is constituted by at least one of resin and metal.

In the first to fourth embodiments,
Although the material forming the coating layer 24 and the convex portion 24a is the same, in other words, the convex portion 24a is continuously formed from the coating layer 24, but the material forming the coating layer 24 and the convex portion 24a is different. You can let me.

In the above description, the permanent magnet rotor is shown as a rotor for an inner rotor type brushless motor, but it may be an outer rotor type rotor. Furthermore, although it is shown as a rotor of a motor (electric motor), it may be a rotor of a generator.

[0065]

According to the first aspect of the present invention, the permanent magnet is covered with the coating material to form the coating layer, and the cuttable convex portion is formed on the outer side of the coating layer, so that the permanent magnet is inserted into the slot. Then, in housing, the convex portion is engaged while being cut by the inner wall surface of the slot, in other words, configured to have a difference in shape and dimension between the permanent magnet and the slot as a cutting allowance for the convex portion,
Since the permanent magnet is housed in the slot while the convex portion is shaved, the permanent magnet can be housed in the slot without any gap and can be securely held therein. Further, since it is not necessary to perform mechanical processing, manufacturing is easy and productivity is improved, and cost can be reduced. Moreover, if a material that complements the gap due to the difference in thermal expansion between the permanent magnet and the slot is selected as the material of the covering material, the permanent magnet can be held in the slot more reliably even after it is housed in the slot.

According to the second aspect of the present invention, since the convex portion is formed in a tapered shape so that the height of the convex portion is minimized at the insertion end of the permanent magnet, it is possible to insert the permanent magnet into the slot. It becomes easy and the workability can be improved.

According to the third aspect of the present invention, since the convex portion is formed so as to be partially formed on at least one outer surface of the coating layer, the convex portion on the inner wall surface of the slot has the effect described above. This facilitates cutting, reduces the pressing force when inserting the permanent magnet into the slot, and reduces the amount of material used for the coating layer.

According to the present invention, since the permanent magnet is plated with metal to form the plating layer and the coating layer is formed on the plating layer, when the permanent magnet is inserted into the slot. It will not be damaged even if it hits the inner wall surface of the slot, and for example, it will be subjected to centrifugal force by forming a plating layer on the surface on which centrifugal force acts most strongly, in other words, not forming a coating layer there. By so doing, damage to the coating layer due to centrifugal force can be effectively prevented.

According to the present invention, the coating layer excludes a surface which is closest to the outer peripheral surface of the rotor when the permanent magnet is accommodated in the slot. In other words, the centrifugal force is the strongest during rotation. In addition to being formed on the remaining surface of the permanent magnet except for the acting surface, the convex portion is formed on the surface most distant from the outer peripheral surface of the rotor.
Even with a high-rotation permanent magnet rotor, damage to the coating layer can be effectively prevented by receiving the centrifugal force on the plated surface (layer) of the permanent magnet, as described immediately above.

According to another aspect of the present invention, the coating layer is formed on the remaining surface of the permanent magnet except for the surface farthest from the outer peripheral surface of the rotor when the permanent magnet is housed in the slot. At the same time, since the convex portion is formed so as to be formed on the surface closest to the outer peripheral surface of the rotor, in addition to the above effects,
Centrifugal force can be received by the coating layer, and damage to the permanent magnet can be prevented.

In addition to the above-mentioned effects, the material of the coating material is at least one of resin and metal, and complements the gap due to the difference in thermal expansion between the permanent magnet and the slot. By selecting a proper material, even after the permanent magnet is housed in the slot, the permanent magnet can be more securely held therein.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a permanent magnet rotor according to an embodiment of the present invention, which is disassembled into a rotor and the like.

FIG. 2 is a front view showing a state where the permanent magnet rotor shown in FIG. 1 is assembled.

FIG. 3 is an enlarged plan view of the permanent magnet shown in FIG.

FIG. 4 is a side view of the permanent magnet shown in FIG. 3 as viewed from above in the drawing.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is an explanatory cross-sectional schematic diagram showing a state in which the permanent magnet shown in FIG. 1 and the like is housed in a slot formed in a rotor.

FIG. 7 is an explanatory cross-sectional schematic view showing a state in which the permanent magnet shown in FIG. 1 and the like is inserted into a slot formed in the rotor.

FIG. 8 is an explanatory cross-sectional schematic diagram showing a state in which a permanent magnet is accommodated in a slot formed in a rotor in the permanent magnet rotor according to the second embodiment of the present invention.

FIG. 9 is an explanatory cross-sectional schematic diagram showing a state in which a permanent magnet is inserted into a slot formed in the rotor in the permanent magnet rotor according to the second embodiment of the present invention.

FIG. 10 is an explanatory cross-sectional schematic diagram showing a state in which a permanent magnet is accommodated in a slot formed in the rotor in the permanent magnet rotor according to the third embodiment of the present invention.

FIG. 11 is an explanatory cross-sectional schematic diagram showing a state in which a permanent magnet is accommodated in a slot formed in a rotor in the permanent magnet rotor according to the fourth embodiment of the present invention.

FIG. 12 is an explanatory cross-sectional schematic diagram showing a state in which a permanent magnet is inserted into a slot formed in the rotor in the permanent magnet rotor according to the fourth embodiment of the present invention.

FIG. 13 is an explanatory cross-sectional schematic diagram showing a state in which a permanent magnet is inserted into a slot formed in a rotor in a permanent magnet rotor according to a conventional technique.

[Explanation of symbols]

10 brushless motor 12 stator 14 Rotor 14c slot 14c1 Slot inner wall surface 16 permanent magnet 22 steps 24 coating layer 24a convex part 26 plating layer 100 laminated steel plate 102 resin

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) // H01F 7/02 H01F 7/02 F (72) Inventor Minoru Nakajima 1-4-1 Chuo, Wako-shi, Saitama Stock Incorporated Honda Technical Research Institute (72) Inventor Noritaka Yamaguchi 1-4-1 Chuo, Wako-shi, Saitama Stock F-term in Honda Technical Research Institute (reference) 5H621 BB07 GA01 GA04 HH01 JK02 JK03 5H622 CA02 CA10 CB01 CB05 DD02 PP03 QA06 QA08

Claims (7)

[Claims] 1. A permanent magnet rotor provided rotatably adjacent to a stator, comprising a yoke made of laminated steel plates, and having a slot formed therein for accommodating a permanent magnet for a field. In, while forming a coating layer by coating the permanent magnet with a coating material, to form a machinable convex portion on the outer side of the coating layer, thereby inserting the permanent magnet into the slot to accommodate it. A permanent magnet rotor, characterized in that the projection is engaged with the inner wall surface of the slot while being cut so that the permanent magnet is housed in the slot. 2. The permanent magnet rotor according to claim 1, wherein the convex portion is formed in a tapered shape so that the height of the convex portion is minimized at the insertion end of the permanent magnet. 3. The permanent magnet rotor according to claim 1, wherein the convex portion is partially formed on at least one outer surface of the coating layer. 4. The plating layer is formed by metal-plating the permanent magnet, and the coating layer is formed on the plating layer. Permanent magnet rotor. 5. The coating layer is formed on the remaining surface of the permanent magnet except for the surface closest to the outer peripheral surface of the rotor when the permanent magnet is housed in the slot, and The permanent magnet rotor according to claim 4, wherein the convex portion is formed on a surface farthest from the outer peripheral surface of the rotor. 6. The coating layer is formed on the remaining surface of the permanent magnet except for the surface most distant from the outer peripheral surface of the rotor when the permanent magnet is housed in the slot. The permanent magnet rotor according to claim 4, wherein the convex portion is formed on a surface closest to the outer peripheral surface of the rotor. 7. The coating material according to claim 1, wherein the coating material is at least one of resin and metal.
The permanent magnet rotor according to any one of items.