JPH11332147A - Permanent magnet type rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent exfoliation of permanent magnets, and to provide a high- performance permanent-magnet type rotating machine. SOLUTION: A permanent-magnet type rotating machine provided with a shaft, a rotor yoke 1 made of a magnetic material are integrally formed and fitted onto the shaft, permanent magnets 2 provided on the peripheral surface of the rotor yoke, and an adhesive agent 3 for fixing the permanent magnets to the rotor yoke, has one or more annular slits or spiral slits 8 in the peripheral surface of the rotor yoke 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous rotating machine having a permanent magnet type magnetic field pole on a rotor, and more particularly, to a rotating shaft integrally formed with a magnetic material and provided on the rotating shaft. The present invention relates to a permanent magnet type rotating machine including a rotor yoke, a permanent magnet provided on an outer peripheral surface of the rotor yoke, and an adhesive for fixing the permanent magnet to the rotor yoke.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show a permanent magnet type rotating machine having a structure in which rotor yokes are not laminated at least in the axial direction, that is, a structure integrally formed of a magnetic material. Have been. 9 is a transverse sectional view, and FIG. 10 is a longitudinal sectional view. In the figure, reference numeral 1 denotes a rotor yoke, 2 denotes a permanent magnet, 3 denotes an adhesive for fixing the permanent magnet to the outer peripheral surface of the rotor yoke, and 4 denotes a rotor. Reference numeral 5 denotes a stator core, 6 denotes a stator winding, and 7 denotes a stator frame. The rotor yoke 1 is formed of a magnetic material such as soft iron in a lump, that is, integrally formed.

[0003]

The structure of the rotor yoke 1 is not a structure in which plate-shaped magnetic bodies are laminated in the axial direction, that is, a structure in which a magnetic material such as soft iron is integrally formed as a lump as it is. An eddy current is generated on the surface of the rotor yoke 1 under the influence of harmonic magnetic flux and slot harmonics from the armature side. This eddy current generates unnecessary heat on the outer peripheral surface of the rotor yoke 1 and wastes energy, so that there is a problem that the efficiency of the rotating machine is reduced. In addition, the generated heat is transmitted to the permanent magnet 2 via the adhesive 3, and there is a problem that the permanent magnet 2 is thermally demagnetized.

Further, in fixing the permanent magnet 2 to the outer peripheral surface of the rotor yoke 1, a non-magnetic adhesive is used. There is also a problem that as the thickness of the adhesive increases, the characteristics of the rotating machine deteriorate. In addition, since the adhesive 3 is disposed or applied on the outer peripheral surface of the rotor yoke 1 on average, the permanent magnet 2 may be displaced by the difference in the coefficient of thermal expansion between the rotor yoke 1 and the permanent magnet 2. Problems such as peeling and cracking have also occurred. An object of the present invention is to solve these problems and to provide a high-performance permanent magnet type rotating machine.

[0005]

According to a first aspect of the present invention, there is provided a rotating shaft, a rotor yoke integrally formed of a magnetic material and provided on the rotating shaft, and a permanent yoke provided on an outer peripheral surface of the rotor yoke. In a permanent magnet type rotating machine including a magnet and an adhesive for fixing a permanent magnet to a rotor yoke, one or two or more slits are provided in an outer circumferential surface of the rotor yoke in an annular shape in a circumferential direction. It is characterized by having.

According to a second aspect of the present invention, there is provided a rotating shaft, a rotor yoke integrally formed of a magnetic material and provided on the rotating shaft, a permanent magnet provided on an outer peripheral surface of the rotor yoke,
A permanent magnet type rotating machine having an adhesive for fixing a permanent magnet to a rotor yoke, wherein one or two or more slits are spirally formed on an outer peripheral surface of the rotor yoke in an axial direction of a rotation axis. It is characterized by having been provided.

According to a third aspect of the present invention, there is provided a rotating shaft, a rotor yoke integrally formed of a magnetic material and provided on the rotating shaft, a permanent magnet provided on an outer peripheral surface of the rotor yoke,
A permanent magnet type rotating machine having an adhesive for fixing a permanent magnet to a rotor yoke, wherein one or two or more slits are provided on an outer peripheral surface of the rotor yoke in a circumferential direction, and the adhesive is provided. Is disposed on the outer peripheral surface of the rotor yoke except for the slit portion.

According to a fourth aspect of the present invention, there is provided a rotating shaft, a rotor yoke integrally formed of a magnetic material and provided on the rotating shaft, a permanent magnet provided on an outer peripheral surface of the rotor yoke,
A permanent magnet type rotating machine having an adhesive for fixing a permanent magnet to a rotor yoke, wherein one or two or more slits are spirally formed on an outer peripheral surface of the rotor yoke in an axial direction of a rotation axis. The adhesive is provided on the outer peripheral surface of the rotor yoke except for the slit portion.

The invention according to claim 5 is the invention according to claims 1 to 4.
3. The permanent magnet type rotating machine according to claim 1, wherein the adhesive contains a magnetic powder.

[0010] The invention of claim 6 is the first to fifth aspects of the present invention.
In the permanent magnet type rotating machine according to any one of the above, the adhesive is non-conductive.

[0011] The invention of claim 7 is the first to sixth aspects of the present invention.
In the permanent magnet type rotating machine described in any one of the above, the rotor yoke has a structure integrally formed with the rotating shaft.

The invention of claim 8 is the first to sixth aspects of the present invention.
Wherein the rotor yoke is formed by laminating a plurality of rotor yoke members circumferentially divided in the circumferential direction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. Embodiment 1 In Embodiment 1, as shown in FIGS. 1 and 2, an outer circumferential surface of a rotor yoke 1 has an annular slit 8 extending in the circumferential direction.
Is formed. FIG. 1 is a transverse sectional view showing an outline of a permanent magnet type rotating machine, and FIG. 2 is a longitudinal sectional view thereof. or,
In the drawing, reference numeral 1 denotes a rotor yoke, 2 denotes a permanent magnet, 3 denotes an adhesive, 4 denotes a rotating shaft, 5 denotes a stator core, 6 denotes a stator winding, 7
Is a stator frame. The rotor yoke 1 has a configuration in which a magnetic material such as soft iron is formed in a lump and is so-called integrally formed.

Referring again to the drawing, the slit 8 is formed annularly in the circumferential direction on the outer peripheral surface of the rotor yoke 1, that is, the surface on which the permanent magnet 2 is fixed. When such a slit 8 is formed on the outer peripheral surface of the rotor yoke 1, even if a harmonic magnetic flux such as a harmonic included in the armature current or a slot harmonic enters the rotor yoke 1, the rotor yoke 1 Since the electric resistance of the outer peripheral surface increases, eddy current hardly flows through the outer peripheral surface, and the rise in the surface temperature of the rotor yoke 1 can be suppressed. Further, even when the rotor yoke 1 and the permanent magnet 2 have different coefficients of thermal expansion, the displacement of expansion and contraction due to heat generation is absorbed by the slits 8 and mitigated. Peeling of the magnet 2 and cracking of the permanent magnet 2 are less likely to occur.

Second Embodiment In a second embodiment, the circumferential slit 8 in the first embodiment shown in FIGS. 1 and 2 is replaced with the outer peripheral surface of the rotor yoke 1 as shown in FIGS. It is formed in a spiral shape in the axial direction. The other configuration is the same as that of the first embodiment, and the description of the reference numerals 1 to 7 in the drawing is omitted. FIG. 3 is a transverse sectional view showing an outline of the permanent magnet type rotating machine, and FIG. 4 is a longitudinal sectional view thereof. As described above, when the slit 8 is formed in the outer peripheral surface of the rotor yoke 1 in a spiral shape extending in the axial direction of the rotating shaft 4 while rotating in the circumferential direction, the same operation as in the case of the first embodiment described above. In addition to the effects, the following effects can be obtained.

That is, forming the slits 8 on the outer peripheral surface of the rotor yoke 1 in a spiral shape is more continuous than the operation of cutting the slits 8 in an annular shape as in the first embodiment. Therefore, the processing time required for the slit processing can be shortened, and the cost can be significantly reduced.

Third Embodiment A third embodiment is different from the first and second embodiments shown in FIGS. 1 to 4 in that the permanent magnet 2 is fixed to the outer peripheral surface of the rotor yoke 1, that is, the permanent magnet 2 is coated. The adhesive 3 is disposed on a surface portion where the slit 8 is not formed in an annular or spiral shape. Regardless of the annular or spiral slit 8, when the adhesive 3 is arranged inside the slit 8, the permanent magnet 2 and the rotor yoke 1
Since it is necessary to secure an adhesive area necessary for fixing the slit 8, the shape of the slit 8 is naturally determined.
On the other hand, in the third embodiment, since the adhesive is disposed on the surface portion where the slit 8 is not formed, the shape of the slit 8 is relatively freely determined while securing the bonding area at the surface portion. Therefore, the relationship between the slit width and the depth can be appropriately selected such that the harmonic magnetic flux does not penetrate deep into the slit 8.

Also, a slit 8 formed in a spiral shape
In this case, since the slits 8 are continuously formed in the axial direction, even if the adhesive 3 disposed on the outer peripheral surface of the stator yoke 1 between the slits 8 has unevenness, Since the agent 3 can move in the axial direction along the slit 8, the adhesive 3 can be arranged more uniformly, and the fixing of the permanent magnet 2 can be stabilized.

Embodiment 4 Embodiment 4 is also different from Embodiments 1 and 2 shown in FIGS. 1 to 4 in that the permanent magnet 2 is fixed to the outer peripheral surface of the rotor yoke 1, that is, the permanent magnet 2 is coated. The adhesive 3 includes a magnetic powder, that is, an adhesive 3 mixed with a magnetic powder. As shown in FIG. 5, the adhesive 30 has magnetic powder and magnetic particles (hereinafter referred to as “magnetic powder 30b including particles”) mixed in the adhesive 30a. Adhesive 3 containing magnetic powder 30b
When 0 is used, the relative magnetic permeability is improved, and the magnetic resistance can be reduced.
While having the size, the efficiency can be further improved.

Embodiment 5 Embodiment 5 is also different from Embodiments 1 and 2 shown in FIGS. 1 to 4 in that the permanent magnet 2 is arranged on the outer peripheral surface of the rotor yoke 1, that is, is coated. The non-conductive adhesive is used as the adhesive 3. If the non-conductive adhesive 3 is used, even if a part of the adhesive 3 enters the inside of the slit 8, there is no influence on the operation and effect according to the present invention.
In addition, when the adhesive 3 is arranged on the outer peripheral surface of the rotor yoke 1, it is not necessary to use extra care to enter the slit 8, so that the work of disposing the adhesive 3 and the work of fixing the permanent magnet 2 can be performed quickly. And production costs can be reduced.

Embodiment 6 In this embodiment 6, a rotor yoke-integrated rotary shaft 40 is used instead of the rotor yoke 1 and the rotary shaft 4 in the first and second embodiments. Other configurations are the same as those of the first and second embodiments. As shown in FIGS. 6 and 7, the rotor yoke-integrated rotary shaft 40 is formed by integrally forming a rotor yoke portion 40a and a rotary shaft portion 40b. Since this embodiment is configured as described above, the following effects are obtained in addition to the effects obtained in the first and second embodiments. That is, the rotor yoke-integrated rotary shaft 40 has a configuration in which the rotor yoke 1 and the rotary shaft 4 are formed as separate members and both are assembled as described in the first and second embodiments. The mechanical strength is further increased, and the step of fixing the rotor yoke 1 and the rotating shaft 4 by press fitting or the like can be omitted, and the production cost can be reduced.

Seventh Embodiment In a seventh embodiment, a circumferentially laminated rotor yoke 10 is used in place of the rotor yoke 1 in the first and second embodiments. Other configurations are the same as those of the first and second embodiments. This circumferential laminated rotor yoke 1
0 is obtained by laminating a plurality of rotor yoke members 10a divided in the circumferential direction in the circumferential direction as shown in FIG. 8 and fixing them using fixing means (not shown). As described above, even in the configuration using the circumferential laminated rotor yoke 10, if the annular slit 8 and the spiral slit 8 shown in the first and second embodiments are not provided, the outer peripheral surface of the rotor yoke 1 is not formed. Since it is evenly continuous in the axial direction,
It is the same as the conventional example that the eddy current flows due to the intrusion of the harmonic magnetic flux and the efficiency decreases. Therefore, the annular slit 8 or the spiral slit 8 is
The effect obtained when applied to the circumferential laminated rotor yoke 10 is exactly the same as in the first and second embodiments.

As described above, the first to seventh embodiments are described with reference to FIG.
8 to FIG. In these figures, a rotating machine in which the rotor is disposed on the inner peripheral side and the stator is disposed on the outer peripheral side is shown. However, the effects of the present invention are not limited thereto, and the rotor is disposed on the outer peripheral side and the stator is disposed. The same effect can be obtained for a rotating machine having the inside of the rotating machine. or,
The shape of the permanent magnet 2 is shown as a shape obtained by dividing an annular member having the same width. However, the shape is not limited to this, and the curvature is different between the side fixed to the rotor yoke and the side facing the stator. The same effect can be obtained even if the material is chamfered, or a ring magnet or the like connected in an annular shape.

[0024]

According to the first to eighth aspects of the present invention, by providing an annular or spiral slit on the outer peripheral surface of the rotor yoke, the generation of eddy current is largely suppressed and the rotor yoke and the permanent Since the difference in the coefficient of thermal expansion from the magnet is structurally absorbed, it is possible to provide a permanent magnet type rotating machine with high efficiency and capable of preventing thermal demagnetization, peeling or cracking of the permanent magnet.

According to the second aspect of the invention, when the slits are provided spirally in the axial direction, the slit processing can be performed continuously, so that the time required for the cutting processing can be reduced. it can.

According to the third aspect of the present invention, since the adhesive is disposed on the outer peripheral surface of the rotor yoke where no slit is formed, the shape of the slit can be relatively freely selected while maintaining the adhesive strength. Therefore, it is possible to provide a slit having a shape suitable for preventing penetration of the high-frequency magnetic flux.

According to the fourth aspect of the present invention, in the spirally formed slit, since the slits are continuously connected in the axial direction, the outer peripheral surface of the stator yoke between the slits is formed. Even if there is unevenness in the adhesive placed on the part, the adhesive can move in the axial direction along the slit, so the adhesive can be arranged more evenly and the fixing of the permanent magnet is stable Can be changed.

According to the fifth aspect of the present invention, since the adhesive contains magnetic powder, an increase in magnetic resistance due to the arrangement (application) of the adhesive can be reduced, and the efficiency can be increased. .

According to the sixth aspect of the present invention, by using a non-conductive adhesive, even if the adhesive penetrates into the slit, the effect of the present invention is not affected at all. In applying the agent, it is not necessary to use extra care to enter the slit, so that the work of arranging the adhesive and the work of fixing the permanent magnet can be performed quickly, and the production cost can be reduced.

According to the seventh aspect of the present invention, the mechanical strength between the rotor yoke and the rotary shaft is further increased, and the step of fixing the rotor yoke and the rotary shaft by press fitting or the like can be omitted. , The production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an outline of a permanent magnet type rotating machine according to a first embodiment.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a cross-sectional view illustrating an outline of a permanent magnet type rotating machine according to a second embodiment.

FIG. 4 is a longitudinal sectional view of FIG.

FIG. 5 is a conceptual diagram of an adhesive containing a magnetic powder according to a fourth embodiment.

FIG. 6 is a cross-sectional view schematically illustrating a permanent magnet type rotating machine according to a sixth embodiment.

FIG. 7 is a longitudinal sectional view of FIG.

FIG. 8 is a transverse sectional view showing an outline of a permanent magnet type rotating machine according to a seventh embodiment.

FIG. 9 is a cross-sectional view showing an outline of a conventional permanent magnet type rotating machine.

FIG. 10 is a longitudinal sectional view of FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 rotor yoke, 2 permanent magnet, 3 adhesive, 4 rotating shaft, 5 stator core, 6 stator winding, 7 stator frame, 8 slit, 10 rotor yoke, 10a rotor yoke member, 30 magnetic powder Adhesive, 30a adhesive, 30b magnetic powder, 40 rotor yoke integrated rotary shaft, 40a rotor yoke, 40b rotary shaft.

Claims (8)

[Claims] 1. A rotating shaft, a rotor yoke integrally formed of a magnetic material and provided on the rotating shaft, a permanent magnet provided on an outer peripheral surface of the rotor yoke, and a permanent magnet fixed to the rotor yoke. A permanent magnet type rotating machine provided with an adhesive, wherein one or two or more slits are provided in an outer circumferential surface of the rotor yoke in an annular shape in the circumferential direction. . 2. A rotating shaft, a rotor yoke integrally formed of a magnetic material and provided on the rotating shaft, a permanent magnet provided on an outer peripheral surface of the rotor yoke, and a permanent magnet fixed to the rotor yoke. A permanent magnet type rotating machine provided with an adhesive, wherein one or two or more slits are provided in an outer peripheral surface of the rotor yoke in a spiral shape in the axial direction of the rotating shaft. Magnet type rotating machine. 3. A rotating shaft, a rotor yoke integrally formed of a magnetic material and provided on the rotating shaft, a permanent magnet provided on an outer peripheral surface of the rotor yoke, and fixing the permanent magnet to the rotor yoke. In the permanent magnet type rotating machine provided with an adhesive, one or two or more slits are provided on an outer peripheral surface of the rotor yoke in a circumferential direction, and the adhesive removes a slit portion of the rotor yoke. A permanent magnet type rotating machine characterized by being arranged on an outer peripheral surface excluding the above. 4. A rotating shaft, a rotor yoke integrally formed of a magnetic material and provided on the rotating shaft, a permanent magnet provided on an outer peripheral surface of the rotor yoke, and fixing the permanent magnet to the rotor yoke. A permanent magnet type rotating machine provided with an adhesive that performs one or two or more slits in an outer peripheral surface of the rotor yoke in a spiral shape toward an axial direction of a rotation axis, and the adhesive rotates. A permanent magnet type rotating machine which is arranged on an outer peripheral surface excluding a slit portion of a child yoke. 5. The permanent magnet type rotating machine according to claim 1, wherein the adhesive contains a magnetic powder. 6. The permanent magnet type rotating machine according to claim 1, wherein the adhesive is non-conductive. 7. The permanent magnet type rotating machine according to claim 1, wherein the rotor yoke has a structure integrally formed with the rotating shaft. 8. The permanent magnet type according to claim 1, wherein the rotor yoke is formed by laminating a plurality of circumferentially divided rotor yoke members in the circumferential direction. Rotating machine.