JP3686764B2 - Magnet damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnet damper used for stabilizing angular velocity fluctuations of a rotating shaft of an electric motor or the like.
[0002]
[Prior art]
As this type of magnet damper, a structure in which a bearing member is fixed to a permanent magnet proposed in Japanese Utility Model Publication No. 6-40446 or the like, or a flywheel disclosed in Japanese Patent Laid-Open No. 8-9585 or the like is a laminated type. There is a thing of the structure. However, the flywheel disclosed in Japanese Patent Application Laid-Open No. 8-9585 is for processing a steel plate into a special fitting structure.
[0003]
[Problems to be solved by the invention]
By the way, in the case of a structure in which the bearing member is fixed to the permanent magnet, it is common to use an inexpensive sintered permanent magnet such as ferrite as the permanent magnet, but in order to fix the bearing member, the center of the sintered permanent magnet is used. Since the dimensional accuracy of the hole is not high, internal polishing or the like is necessary, which increases the cost.
[0004]
In addition, when the flywheel laminated structure disclosed in Japanese Patent Laid-Open No. 8-9585 is used, the steel sheet is processed into a special fitting structure, which increases the die cost and is not suitable for applications with a small number of production lots.
[0005]
A first object of the present invention is to provide a magnet damper that is easy to manufacture, inexpensive, and suitable for small-lot production in view of the above points.
[0006]
The second object of the present invention is to make the flywheel part as a laminated structure of steel plates, which can be produced with a simple and high-precision metal press die, and further to integrate the laminated structure using a through-fixing member such as a rivet. Therefore, an object of the present invention is to provide a magnet damper that is inexpensive and suitable for small-lot production, and that can easily adjust and change the moment of inertia.
[0007]
Other objects and novel features of the present invention will be clarified in embodiments described later.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the first invention of the present application includes a flywheel that is rotatably supported by a bearing member on the rotating shaft side, a yoke member made of a magnetic material fixed to the shaft, and the flywheel. In a magnet damper having a permanent magnet fixed to the side,
The diameter of the center hole of the disk-shaped permanent magnet is made larger than the diameter of the center hole of the flywheel, the flywheel is made of a magnetic material, and a magnetic circuit is provided between the permanent magnet and the yoke member. It is characterized by the construction.
[0009]
The second invention of the present application includes a flywheel rotatably held by a bearing member on the rotary shaft side, a yoke member made of a magnetic material fixed to the shaft, and a permanent magnet fixed to the flywheel side. In a magnet damper equipped with
The flywheel a plurality of at least two or more through holes of open steel, Ri configuration der formed by laminating a through fixing member to each of the through-hole is inserted and fixed,
The diameter of the center hole of the disk-shaped permanent magnet is larger than the diameter of the center hole of the flywheel .
[0010]
In the magnet damper of the first or second invention of the present application, the permanent magnet may have a multipolar magnetized structure.
[0011]
The bearing member may be fixed to the center hole of the flywheel and the permanent magnet may be fixed to the flywheel with an adhesive.
[0012]
A rivet or a screw member can be used as the penetration fixing member.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a magnet damper according to the present invention will be described below with reference to the drawings.
[0014]
1 is a side view with a half cross section (showing a cross section seen from II in FIG. 2), FIG. 2 is a front view, and FIG. 3 is a front view in which a rotating shaft and a yoke member are omitted (FIG. 1). III-III arrow view).
[0015]
In these figures, reference numeral 1 denotes a steel plate, which is punched out into a disk shape by metal press die processing so as to have a center hole 2a or 2b and two or more through holes 3 for lamination, and a plurality of layers are laminated. The flywheel 10 is configured by being integrated by a through-fixing member 5 that penetrates the through-hole 3. However, the center hole 2b of the steel plate 1 on the side facing the yoke member 30 of the magnetic body is larger than the center hole 2a of other portions in order to attach the disk-shaped permanent magnet (magnet) 20 such as a sintered ferrite magnet. It is a diameter. As a result, a disk-shaped recess 4 formed by the center hole 2b of the laminate of the steel plates 1 is formed on the side of the flywheel 10 facing the yoke member 30.
[0016]
A disc-shaped permanent magnet 20 having a center hole 21 having the same inner diameter as the center hole 2a is arranged and fixed in the disc-shaped recess 4 and the inner periphery of the center hole 2a of the laminated steel plates 1 and the permanent magnet 20 are arranged. A cylindrical bearing member 15 is inserted and fixed to the inner periphery of the center hole 21. The bearing member 15 is fixed to the center hole of the flywheel 10 and the permanent magnet 20 is fixed to the recess 4 of the flywheel at once using an adhesive. Since the center hole 2a of the steel plate 1 is formed with high precision by pressing, the inner peripheral surface of the permanent magnet 20 is not processed by forming the center hole 21 of the permanent magnet 20 somewhat larger. The bearing member 15 can be inserted into the center holes 2a and 21 and bonded.
[0017]
A disk-like permanent magnet 20 such as a sintered ferrite magnet is magnetized in the thickness direction, and the flywheel 10 is made of a magnetic material, thereby forming a magnetic circuit between the permanent magnet 20 and the yoke member 30. The permanent magnet 20 is multipolarly magnetized, for example, as shown in the magnetic pole arrangement of FIG. 3, thereby increasing the magnetic attractive force between the permanent magnet 20 and the yoke member 30.
[0018]
On the other hand, reference numeral 35 denotes a rotating shaft of an electric motor or the like, and a yoke member 30 formed of a magnetic material such as steel and having a cylindrical shaft portion 31 and a circular flange portion 32 at an end thereof is screwed on the rotating shaft 35. It is fixed at 36 etc. The flywheel 10 in which the permanent magnet 20 and the bearing member 15 are integrated is rotatably fitted to the rotary shaft 35 side, that is, the outer periphery of the cylindrical shaft portion 31 of the yoke member 30 by the bearing member 15. 31 is arranged to face the permanent magnet 20 through a circular thin plate-like sliding plate 37 made of a low friction material such as a fluororesin. The flywheel 10 is rotatably held on the shaft 35 side by a magnetic attractive force between the permanent magnet 20 and the yoke member 30 (mainly the flange portion 31). In this case, the inertia of the flywheel 10 is set to be sufficiently large, and if the rotation shaft 35 has uneven rotation, the flywheel 10 slips with respect to the rotation shaft 35 in an attempt to continue the constant speed rotation motion, and exhibits a damper effect.
[0019]
Two or more penetrating fixing members 5 are provided symmetrically with respect to the center of the steel plate 1, and rivets, snaps, screw members, or the like can be used. In particular, if rivets or fastenings are used, the laminating operation of the steel plate 1 can be further simplified and the cost can be reduced.
[0020]
According to this embodiment, the following effects can be obtained.
[0021]
(1) The flywheel 10 has a configuration in which a plurality of steel plates 1 having at least two or more through holes 3 are laminated by inserting and fixing through fixing members 5 in the respective through holes 3. No special processing is required, and the flywheel part can be produced with a simple metal press die. Furthermore, the steel sheets can be laminated and integrated easily with the through-fixing member 5 such as a rivet, and the number of laminated sheets can be easily changed (that is, the moment of inertia) can be easily reduced at a low cost and suitable for small lot production. it can.
[0022]
(2) The concave portion 4 for arranging the permanent magnet 20 can be easily formed by partially changing the diameter of the central hole of the steel plates 1 to be laminated.
[0023]
(3) The three components of the flywheel 10, the bearing member 15, and the permanent magnet 20 can be fixed in a single bonding process, which is easy to manufacture.
[0024]
(4) By fixing the permanent magnet 20 to the magnetic flywheel 10, the magnetic characteristics can be improved and the magnetic attractive force between the yoke member 30 can be increased.
[0025]
(5) The permanent magnet 20 has a multi-pole magnetized structure and can increase the magnetic attractive force between the permanent magnet 20 and the yoke member 30.
[0026]
In the above embodiment, the flywheel 10 is arranged on the outer periphery of the cylindrical shaft portion 31 of the yoke member 30, but the bearing member of the flywheel center hole is directly rotatable on the outer periphery of the rotary shaft 1. It does not matter even if it is a structure fitted in.
[0027]
Further, on the principle of operation, it is possible to adopt a structure in which a permanent magnet is fixed on the yoke member side and a magnetic flywheel is magnetically attracted.
[0028]
Although the embodiments of the present invention have been described above, it will be obvious to those skilled in the art that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims.
[0029]
【The invention's effect】
As described above, according to the magnet damper according to the present invention, on the rotating shaft side, the flywheel that is rotatably held by the bearing member, the yoke member made of a magnetic material fixed to the shaft, and the permanent member In the configuration having a magnet, the diameter of the center hole of the permanent magnet is made larger than the diameter of the center hole of the flywheel, the flywheel is made of a magnetic material, and the permanent magnet is disposed between the yoke member and the permanent magnet. Since a magnetic circuit is constructed, a structure suitable for small lot production can be realized at low cost. In addition, if the flywheel has a structure in which a plurality of steel plates having at least two through holes are laminated by inserting and fixing a through fixing member in each through hole, each steel plate is simple and highly accurate. The metal moment can be easily changed by changing the number of stacked steel plates.
[Brief description of the drawings]
FIG. 1 is a side view, partly in section, showing an embodiment of a magnet damper according to the present invention.
FIG. 2 is a front view of the same.
FIG. 3 is a front view showing the flywheel, the bearing member, and the permanent magnet arrangement in the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel plate 2a, 2b, 21 Center hole 3 Through hole 4 Disc-shaped recessed part 5 Through fixing member 10 Flywheel 15 Bearing member 20 Permanent magnet 30 Yoke member 31 Cylindrical shaft part 32 Flange part 35 Rotating shaft 37 Sliding plate

Claims (5)

On the rotating shaft side, there is provided a flywheel rotatably held by a bearing member, a yoke member made of a magnetic material fixed to the shaft, and a permanent magnet fixed to the flywheel side. In the magnet damper,
The diameter of the center hole of the disk-shaped permanent magnet is made larger than the diameter of the center hole of the flywheel, the flywheel is made of a magnetic material, and a magnetic circuit is provided between the permanent magnet and the yoke member. A magnet damper characterized by comprising. On the rotating shaft side, there is provided a flywheel rotatably held by a bearing member, a yoke member made of a magnetic material fixed to the shaft, and a permanent magnet fixed to the flywheel side . In the magnet damper,
The flywheel a plurality of at least two or more through holes of open steel, Ri configuration der formed by laminating a through fixing member to each of the through-hole is inserted and fixed,
A magnet damper , wherein the diameter of the center hole of the disk-shaped permanent magnet is larger than the diameter of the center hole of the flywheel .   The magnet damper according to claim 1 or 2, wherein the permanent magnet has a multipolar magnetized structure.   The magnet damper according to claim 1, 2 or 3, wherein the bearing member is fixed to the center hole of the flywheel and the permanent magnet is fixed to the flywheel with an adhesive.   The magnet damper according to claim 1, 2, 3, or 4, wherein the penetration fixing member is a rivet or a screw member.

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