JP2012120366A - Permanent magnet motor, magnet for the same, and structure for bonding magnet for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adversely affect the position accuracy of a magnet due to foreign object biting in a line adjacent portion between two sides of both ends of a magnet and an adherent member, which has been a problem of a conventional permanent magnet motor, and occurs at both ends of the magnet The permanent magnet motor, its magnet, and its magnet bonding structure are obtained that solves the adverse effect on the bonding reliability caused by the air biting into the adhesive, and greatly improves the motor performance reliability.
A permanent magnet motor has a structure in which a magnet 1 is provided with convex portions 22 at least at three corners on a bonding surface with a shaft 3, and the convex portions 22 are close to the shaft 3 and are magnets. 1 is bonded and fixed by an adhesive layer 21 made of an adhesive 2 formed in a gap surrounded by the convex portion 22, the magnet 1 facing surface on the shaft 3 side, and the surface of the shaft 3.
[Selection] Figure 1

Description

The present invention relates to rotary and linear permanent magnet motors, magnets thereof, and magnet adhesion structures thereof.

In conventional rotary and linear permanent magnet motors, the shape of the radial direction of the shaft (rotor) side in the magnet cross section is substantially arc-shaped, and the curvature is made larger than the curvature of the shaft, so that the shaft of the magnet A gap is formed in a region surrounded by the side and the surface of the shaft, and the two sides at both ends of the magnet along the shaft axis are close to the attached member which is the shaft (rotor) and the stator (stator), and the magnet and the attached member The gap generated between the two is filled with an adhesive and bonded (for example, see Patent Document 1 and Patent Document 2).

Japanese Patent No. 4267309 (page 13, FIG. 8) Japanese Patent Laying-Open No. 2010-187536 (page 8, FIG. 2)

Since the conventional permanent magnet motor is configured as described above, in the rotary permanent magnet motor, after the adhesive is applied to the adherent member that is a magnet or a shaft (rotor), the magnet and the adherent member are applied. When bonding, if both sides of the magnet are close to the adherent member, the magnet comes close to the adherent member by line contact. There is a problem that the position accuracy of the magnet is likely to be affected, for example, a foreign object is easily caught in the part, and the magnet is inclined and bonded. Further, at both ends of the magnet, there is a problem in that air is easy to bite into the adhesive and affects the adhesion reliability.

Furthermore, in a linear permanent magnet motor, when the adherend member which is a magnet and a stator (stator) has the same shape, for example, when both the magnet and the adherend member are parallel plates, the gap between the magnet and the adherend member However, since there is almost no gap filling the adhesive, the thickness of the adhesive is reduced, and there is no structure for controlling the thickness of the adhesive, so that there is a problem that stable adhesive strength cannot be obtained.

The present invention has been made to solve the above-described problems, and the object thereof is generated in the vicinity of the magnet and the adherend while having the same productivity as the manufacture of the conventional permanent magnet motor. Decrease in magnet position accuracy due to foreign object biting, decrease in adhesion reliability due to air bite generated at both ends of the magnet, and thin adhesive generated when the magnet and adherend are the same shape The permanent magnet motor which suppresses the fall of the adhesive reliability resulting from this, and its magnet adhesion structure are obtained.

The permanent magnet motor according to the present invention is a permanent magnet motor in which a magnet is bonded and fixed to the rotor or stator and the rotor or stator with an adhesive, and the magnets are at least three corners on the bonding surface with the rotor or stator. As described above, it has a structure with a convex portion, the convex portion is point-adjacent to the rotor or the stator, and the magnet is bonded to the convex portion, the magnet facing surface on the rotor or stator side, and a gap surrounded by the rotor or the stator. It is bonded and fixed with an adhesive layer made of an agent.

The present invention has a structure in which a desired gap is provided between the magnet and the adherent member and the magnet and the adherent member are bonded and fixed with an adhesive, thereby ensuring a certain thickness of the adhesive and providing a stable adhesive strength. In addition to being able to obtain, by making the point between the convex portion of the magnet and the adherend member, compared to the conventional line proximity of the two sides between the magnet and the adherent member, it suppresses the biting of foreign matter and air, Since the influence on the magnet position accuracy can be reduced and a stable adhesive strength can be obtained, the performance reliability of the permanent magnet motor is greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a magnet adhesion structure diagram of a rotary permanent magnet motor showing Embodiment 1 of the present invention. It is a figure showing the adhesive layer thickness dependence of the adhesive strength of the permanent magnet motor which shows Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a magnet adhesion structure diagram of a rotary permanent magnet motor showing Embodiment 1 of the present invention. It is a magnet adhesion structure figure of the rotary type permanent magnet motor which shows Embodiment 2 of this invention. It is a magnet adhesion structure figure of the rotary type permanent magnet motor which shows Embodiment 3 of this invention.

Embodiment 1 FIG.
FIG. 1 is a magnet adhesion structure diagram of a rotary permanent magnet motor according to Embodiment 1 for carrying out the present invention. In FIG. 1, 1 is a magnet, 2 is an adhesive, and 3 is a shaft as a rotor. Reference numeral 21 denotes an adhesive layer made of the adhesive 2 formed in a gap surrounded by the magnet 1 and the shaft 3, and 22 denotes a convex portion existing on the bottom surface of the magnet 1. There are four locations 22 at the corners of the magnet 1. The surface of the magnet 1 on the shaft 3 side is processed into a concave spherical shape having a curvature larger than the curvature of the shaft 3 in the radial direction. On the other hand, the surface of the magnet 1 facing the surface on the shaft 3 side is a concave curved surface having a curvature larger than the curvature of the shaft 3 in the radial direction with respect to the direction along the radial direction of the shaft 3. There is a flat plate shape in the direction along the axial direction of the shaft 3, that is, it is processed so as to have a substantially arc shape.

In the structure in which the magnet 1 is bonded to the shaft 3 using the adhesive 2, the magnet 1 and the shaft 3 are close to each other at the four convex portions 22 of the magnet 1, and the adhesive 2 is applied to the adhesive layer 21. 1 and the shaft 3 are bonded and fixed. In the first embodiment, after the adhesive 2 is applied to the magnet 1 or the shaft 3, the magnet 1 and the shaft 3 are bonded together, and the adhesive 2 of the adhesive layer 21 is cured and fixed.

In FIG. 1, AA ′, BB ′, and CC ′ represent cross-sectional directions when the magnet 1 is cut along the radial direction of the shaft 3, and DD ′ and EE ′. And FF ′ represent cross-sectional directions when the magnet 1 is cut along the axial direction of the shaft 3. The AA ′ cross section and the CC ′ cross section are cross sections in which the cross section of the convex portion 22 of the magnet 1 is present, and thus are cross sections in a state where the convex portion 22 is close to the shaft 3, but BB 'Because the cross section is the cross section of the central portion of the magnet 1, it is a cross section in which the adhesive layer 21 exists between the both ends of the magnet 1 and the shaft 3. Similarly, the DD ′ cross section and the FF ′ cross section are cross sections in which the cross section of the convex portion 22 of the magnet 1 exists, and thus are cross sections in a state where the convex portion 22 is close to the shaft 3. Since the EE ′ cross section is a cross section of the central portion of the magnet 1, it is a cross section in which the adhesive layer 21 exists between both end portions of the magnet 1 and the shaft 3.

FIG. 2 is a diagram showing the adhesive layer thickness dependency of the adhesive strength of the permanent magnet motor according to the first embodiment of the present invention. In FIG. 2, the vertical axis represents the adhesive strength, and the horizontal axis represents the adhesive thickness of the adhesive layer. As shown in FIG. 2, the adhesive strength increases sharply with respect to the adhesive thickness, and after reaching a maximum value, it becomes a gradually decreasing curve. Therefore, an optimal adhesive thickness is selected when bonding. There is a need.

From the standpoint of magnet positioning accuracy, it is not necessary to obtain adhesive strength between the convex portions 22 of the magnet 1 at three or more points close to each other and the adjacent portion of the shaft 3, and even if bonded, it is less than 50% of the maximum bonding strength. It is desirable that the distance with which the strength is sufficient is 25 μm or less, and the adhesive layer 21 of the other adhesive 2 can secure a strength of 50% or more of the maximum adhesive strength from the viewpoint of optimization of the adhesive strength. It is desirable to have an adhesion thickness of. Further, regarding the area per one point of the convex portions 22 that are close to each other, if the adhesive area of the convex portions 22 is large, the area that does not contribute to the adhesive strength increases accordingly, and the strength decreases. In general, it is said that the adhesion area should be 50% or more of the magnet area, and if the adhesion area per part of the convex part 22 is 10% or less of the total area of the magnet adhesion, even with four convex parts 22 Since an area of 60% or more can be secured even in the vicinity of the point, it is desirable that the adhesion area per one portion of the convex portion 22 is 10% or less of the total magnet adhesion area.

In the rotary permanent magnet motor according to the first embodiment, a constant adhesion thickness can be secured even in the adhesion of magnetized magnets, so that stable adhesion strength can be obtained. Further, unlike the case where both ends of the magnet 1 are in line proximity with the shaft 3 as in the conventional permanent magnet motor, the point between the four convex portions 22 of the magnet 1 and the shaft 3 is made point proximity. The biting is suppressed, and the possibility that the foreign matter and the proximity portion of the magnet 1 or the shaft 3 interfere with each other to affect the positional accuracy of the magnet 1 is suppressed. Further, by suppressing the air from entering the bonding surface at the convex portion 22 of the magnet 1, the reliability of the bonding is reduced due to the occurrence of poor curing of the adhesive when using an anaerobic adhesive or the reduction of the effective bonding area. Can be prevented.

Further, even when a foreign object is caught between the four convex portions 22 of the magnet 1 and the shaft 3, in the case of point proximity as in the first embodiment, when pressing the magnet 1 against the shaft 3, There are few cases where the foreign matter stays between the convex portion 22 and the shaft 3, the probability that the foreign matter is displaced when pressed is higher, and the direction in which the foreign matter is displaced is substantially uniform in all directions with the convex portion 22 as the center. is there. Accordingly, it can be said that the probability that the foreign matter is further displaced between the magnet 1 and the shaft 3 due to the pressing is approximately 25%.

On the other hand, even in the case of conventional line proximity, the foreign matter may be displaced by pressing the magnet 1 against the shaft 3, but in the case of line proximity, the direction in which the foreign matter is displaced is centered on the line in which the foreign matter is biting, There are only two directions between the magnet 1 and the shaft 3 that move further inside or move outward. Therefore, in the case of close proximity to the line, it can be said that the probability that the foreign matter is further displaced to the inside between the magnet 1 and the shaft 3 by pressing is about 50%. From this point as well, the first embodiment will be described. The effect of the point proximity is that the foreign matter is less likely to bite than the conventional line proximity.

As described above, by employing the rotary permanent magnet motor according to the first embodiment, the problems of the conventional rotary permanent magnet motor can be solved, and the performance reliability of the rotary permanent magnet motor is improved. Greatly improved.

In FIG. 1, the surface of the magnet 1 on the shaft 3 side is the magnet 1 processed into a spherical shape with a concave central portion, but as shown in FIG. 3, the surface of the magnet 1 on the shaft 3 side is The same applies to the case where the curved surface is processed into a concave curved surface having a curvature larger than the curvature in the radial direction of the shaft 3 with respect to the radial direction of the shaft 3 and the two axial directions orthogonal to the radial direction. The effect is obtained.

Embodiment 2. FIG.
FIG. 4 is a magnet adhesion structure diagram of a rotary permanent magnet motor according to Embodiment 2 for carrying out the present invention. In FIG. 4, reference numeral 5 denotes a magnet projection that is a projection structure, and reference numeral 23 denotes a projection bottom surface portion where the magnet projection 5 is close to the surface of the shaft 3. In the second embodiment, as shown in FIG. 4, magnet projections 5 are provided at four corners of the magnet 1, and the projection bottom surface portion 23 of the magnet projection 5 serves as a proximity portion to the shaft 3, and the adhesive 2 is applied to the magnet 1 or the shaft 3, and then the magnet 1 and the shaft 3 are bonded together to cure the adhesive 2. The shape of the magnet 1 is the same as the shape described in the first embodiment. The material of the magnet protrusion 5 is a magnet material or a metal material.

As in the first embodiment, in FIG. 4, AA ′, BB ′, and CC ′ represent cross-sectional directions when the magnet 1 is cut along the radial direction of the shaft 3, and D −D ′, EE ′, and FF ′ represent cross-sectional directions when the magnet 1 is cut along the axial direction of the shaft 3. The AA ′ cross section and the CC ′ cross section are cross sections in which the cross section of the magnet projection 5 exists, and thus the cross section in a state where the magnet projection 5 is close to the shaft 3, but BB ′. Since the cross section is a cross section of the central portion of the magnet 1, the cross section is such that the adhesive layer 21 exists between both end portions of the magnet 1 and the shaft 3. Similarly, the DD ′ cross section and the FF ′ cross section are cross sections in which the cross section of the magnet projection portion 5 exists, and thus the cross section in a state where the magnet projection portion 5 is close to the shaft 3. The −E ′ cross section is a cross section of the center portion of the magnet 1, and therefore, a cross section in which the adhesive layer 21 exists between both end portions of the magnet 1 and the shaft 3.

Since the adhesive strength depends on the adhesive thickness as described in the first embodiment, it is necessary to select an optimal adhesive thickness. As in the first embodiment, from the viewpoint of magnet positioning accuracy, the magnet protrusions 5 of the magnet 1 at three or more locations have a distance of 25 μm or less between the protrusion bottom surface portion 23 and the adjacent portion of the shaft 3, and the adhesive layer 21. From the viewpoint of optimizing the adhesive strength, the adhesive thickness is desirably 50 to 200 μm. Further, it is desirable that the area per one portion of the protrusion bottom surface portion 23 is 10% or less of the total area of magnet adhesion, as in the first embodiment.

In the second embodiment, since the magnet protrusion 5 can ensure a certain thickness of the adhesive 2 with the adhesive layer 21 of the adhesive 2, the area of the optimum adhesive thickness can be increased. In the bonding of magnetized magnets, a certain bonding thickness can be secured, a stable bonding strength can be obtained, and the bonding reliability can be improved. Similarly to the first embodiment, the point between the projection bottom surface portion 23 and the shaft 3 is made close to the point, so that the foreign matter is prevented from being caught, and the foreign matter and the magnet 1 or the adjacent portion of the shaft 3 interfere with each other. The possibility of affecting the position accuracy of is suppressed. In addition, by suppressing the air from entering the bonding surface at both ends of the magnet, it prevents the adhesive from being hardened when anaerobic adhesive is used and the reliability of the adhesive from being lowered due to the reduction in effective bonding area. be able to.

Furthermore, even if the magnet is not a magnet having a curved structure with a complicated cross section as in the first embodiment, by providing the magnet protrusion 5 of the second embodiment, for example, in a rectangular magnet having a long cross section, The same adhesive cure can be obtained.

As described above, by employing the rotary permanent magnet motor according to the second embodiment, the problems of the conventional rotary permanent magnet motor can be solved, and the performance reliability of the rotary permanent magnet motor can be improved. Greatly improved.

Embodiment 3 FIG.
FIG. 5 is a magnet adhesion structure diagram of a rotary permanent magnet motor according to Embodiment 3 for carrying out the present invention. As shown in FIG. 5, the magnet 1 is subjected to polygonal processing so as to follow the radial direction of the shaft 3, and the magnet as in the second embodiment is formed at four corners of the magnet 1 subjected to this polygonal processing. The protrusion 5 is provided. When the magnet 1 subjected to the polygonal processing is provided with the magnet protrusion 5, the material used for the magnet 1 is a magnet material or a metal material. In this third embodiment, the magnet protrusion 5 provided on the magnet 1 becomes a point proximity portion with the shaft 3, and after the adhesive 2 is applied to the magnet 1 or the shaft 3, the magnet 1 and the shaft 3 are bonded together. This is a magnet adhesion structure obtained by curing the adhesive 2.

As in the first embodiment, in FIG. 5, AA ′, BB ′, and CC ′ represent cross-sectional directions when the magnet 1 is cut along the radial direction of the shaft 3, and D −D ′, EE ′, and FF ′ represent cross-sectional directions when the magnet 1 is cut along the axial direction of the shaft 3. The AA ′ cross section and the CC ′ cross section are cross sections in which the cross section of the magnet projection 5 exists, and thus the cross section in a state where the magnet projection 5 is close to the shaft 3, but BB ′. Since the cross section is a cross section of the central portion of the magnet 1, the cross section is such that the adhesive layer 21 exists between both end portions of the magnet 1 and the shaft 3. Similarly, the DD ′ cross section and the FF ′ cross section are cross sections in which the cross section of the magnet projection portion 5 exists, and thus the cross section in a state where the magnet projection portion 5 is close to the shaft 3. The −E ′ cross section is a cross section of the center portion of the magnet 1, and therefore, a cross section in which the adhesive layer 21 exists between both end portions of the magnet 1 and the shaft 3.

In this third embodiment, as in the first embodiment, from the viewpoint of magnet positioning accuracy, the magnet protrusions 5 of the magnet 1 at three or more locations have a distance of 25 μm or less between the protrusion bottom surface portion 23 and the adjacent portion of the shaft 3. And it is desirable that the adhesive layer 21 has an adhesive thickness of 50 to 200 μm from the viewpoint of optimizing the adhesive strength. Further, it is desirable that the area per one portion of the protrusion bottom surface portion 23 is 10% or less of the total area of magnet adhesion, as in the first embodiment.

In the third embodiment, the magnet bonding surface is subjected to polygonal processing to increase the effective bonding area of the magnet 1 and to secure a certain bonding thickness even in the bonding of the magnetized magnet, and stable bonding strength. Can be obtained and the adhesive strength can be improved. Similar to the first and second embodiments, the point between the projection bottom surface portion 23 and the shaft 3 is made close to the point, so that the entry of foreign matter is suppressed, and the foreign matter and the proximity portion of the magnet 1 or the shaft 3 interfere with each other. Thus, the possibility of affecting the position accuracy of the magnet 1 is suppressed. In addition, by suppressing the air from entering the bonding surface at both ends of the magnet, it prevents the adhesive from being hardened when anaerobic adhesive is used and the reliability of the adhesive from being lowered due to the reduction in effective bonding area. be able to.

Thus, by adopting the rotary permanent magnet motor according to the third embodiment, the problems of the conventional rotary permanent magnet motor can be solved, and the performance reliability of the rotary permanent magnet motor is improved. Greatly improved.

In addition, although the material of the magnet projection part 5 shown in Embodiment 2 or Embodiment 3 was a magnet material or a metal material, it may be a resin material. In this case, the linear expansion coefficient of the resin material is desirably close to that of the adhesive 2 and may be the same as the material of the adhesive 2. Thus, the thermal shock resistance can be improved by using the magnet protrusion 5 as a resin material having the same linear expansion coefficient as that of the adhesive 2.

In the first to third embodiments, the case where the magnet of the rotary permanent magnet motor and the shaft (rotor) are bonded has been described. However, the magnet bonding structure of the permanent magnet motor according to the present invention is a linear permanent magnet. The same effect can be obtained even when the magnet of the magnet motor and the stator (stator) are bonded.

1 magnet, 2 adhesive, 3 shaft, 5 magnet projection, 21 adhesive layer, 22 projection, 23 projection bottom.

Claims (18)

A rotor or stator, and a permanent magnet motor in which a magnet is bonded and fixed to the rotor or stator by an adhesive,
The magnet has a structure including convex portions at at least three corners on the bonding surface with the rotor or stator, the convex portions are point-adjacent to the rotor or stator, and the magnet includes the convex portions. A permanent magnet motor characterized by being bonded and fixed by an adhesive layer made of the adhesive formed in a gap surrounded by the magnet facing surface on the rotor or stator side and the surface of the rotor or stator. 2. The permanent magnet motor according to claim 1, wherein the projecting portion is constituted by a projecting structure portion, and the projecting structure portion is close to the surface of the rotor or the stator at at least three points. A rotor or stator, and a permanent magnet motor in which a magnet is bonded and fixed to the rotor or stator by an adhesive,
The magnet is point-adjacent to the rotor or stator at least at three or more corners on the bonding surface with the rotor or stator via a protrusion structure portion made of a resin material, and the magnet is adjacent to the protrusion structure portion and the rotor. Alternatively, the permanent magnet motor is fixed by an adhesive layer made of the adhesive formed in a gap surrounded by the magnet facing surface on the stator side and the surface of the rotor or stator. The shape on the rotor or stator side in the magnet cross section is a spherical shape in which a central portion having a curvature larger than the curvature in the radial direction of the rotor or stator is concave. The permanent magnet motor according to any one of the above. The shape on the rotor or stator side in the magnet cross section is larger than the curvature in the radial direction of the rotor or stator with respect to two directions of the radial direction of the rotor or stator and the axial direction orthogonal to the radial direction. The permanent magnet motor according to any one of claims 1 to 3, wherein a central portion having a curvature is a concave curved surface. The shape of the rotor or stator side in the magnet cross section is a polygonal shape having a concave central portion along the radial direction of the rotor or stator. Permanent magnet motor. A magnet provided with a convex portion that is close to the adherend member at at least three corners on the adhesion surface with the adherend member, the convex portion and the magnet facing surface on the adherend member side and the magnet A magnet capable of being bonded by an adhesive layer made of an adhesive formed in a gap surrounded by a surface of an adherend. The magnet according to claim 7, wherein the projecting portion is constituted by a projecting structure portion, and the projecting structure portion is close to the surface of the adherend member at at least three points. A magnet provided with a protruding structure portion made of a resin material that is in close proximity to the adhered member at at least three corners on the adhesion surface with the adhered member, the magnet being provided on the protruding structure side and the adhered member side. A magnet capable of being bonded by an adhesive layer made of an adhesive formed in a gap surrounded by the magnet facing surface and the surface of the adherend member. The shape on the side of the adherent member in the magnet cross section is a spherical shape in which a central portion having a curvature larger than a curvature in a radial direction of the adherent member is a concave spherical shape. The magnet in any one of. The shape on the adherend member side in the magnet cross section is larger than the curvature in the radial direction of the adherend member with respect to two directions of the radial direction of the adherend member and the axial direction orthogonal to the radial direction. The magnet according to any one of claims 7 to 9, wherein a central portion having a curvature has a concave curved surface shape. The shape on the adherend member side in the magnet cross section is a polygonal shape having a concave central portion along the radial direction of the adherend member. Magnet. A magnet adhesion structure in which a magnet is adhered and fixed to an adherent member with an adhesive,
The magnet has a structure provided with convex portions at at least three corners on the adhesion surface with the adherend member, the convex portions are in point proximity to the adherend member, and the magnet includes the convex portions. A magnet adhesion structure characterized by being bonded and fixed by an adhesive layer made of the adhesive formed in a gap surrounded by the magnet facing surface on the adherend member side and the surface of the adherend member. The magnet adhesion structure according to claim 13, wherein the convex portion is constituted by a projecting structure portion, and the projecting structure portion is close to the surface of the adherend member at at least three points. A magnet adhesion structure in which a magnet is adhered and fixed to an adherent member with an adhesive,
The magnet is point-adjacent to the adherend member at least at three or more corners on the bonding surface with the adherend member via a protrusion structure portion made of a resin material, and the magnet is connected to the protrusion structure portion and the adherend member. A magnet adhesion structure characterized by being bonded and fixed by an adhesive layer made of the adhesive formed in a gap surrounded by the magnet facing surface on the attachment member side and the surface of the adherend member. The shape on the side of the adherent member in the magnet cross section is a spherical shape with a concave central portion having a curvature larger than the curvature of the adherend member in the radial direction. The magnet adhesion structure in any one of. The shape on the adherend member side in the magnet cross section is larger than the curvature in the radial direction of the adherend member with respect to two directions of the radial direction of the adherend member and the axial direction orthogonal to the radial direction. The magnet bonding structure according to any one of claims 13 to 15, wherein a central portion having a curvature is a concave curved surface shape. The shape on the side of the adherend member in the magnet cross section is a polygonal shape having a concave central portion along the radial direction of the adherend member. Magnet adhesion structure.

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