JPH0510909B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a magnetic coupling that can be used in power transmission parts of various industrial machines.

(b) Prior Art Conventionally, this type of magnetic coupling has been developed using an outer rotor having multiple outer magnets arranged on the inner periphery of an outer rotor yoke, and an outer magnet arranged in a hollow part of the axis of the outer rotor. Some rotors are equipped with an internal rotor having an internal rotating yoke and a plurality of internal magnets corresponding to the external magnets provided on the outer periphery of the internal rotating yoke.

By the way, when such a magnetic coupling is operated at high speed, a large stress based on centrifugal force etc. acts on the rotating yoke holding a large number of magnets, and in particular, tensile stress acting on the outer yoke acts on the rotating yoke. shows a very large value. In addition, in such magnetic couplings, the magnitude of the magnetic permeability of the yoke has a large effect on the transmitted torque, and if a yoke with low magnetic permeability is used, it will be necessary to increase the size of the entire coupling. Unable to transmit torque.

Therefore, for example, the rotational power of a gas turbine can be
When it is possible to transmit a relatively high torque under high speed rotation and is required to be compact, such as a magnetic coupling used in a part that transmits a He compressor, the above-mentioned It is desirable that the yoke be made of a material with high strength and good magnetic permeability.

However, conventionally known high-strength materials all have low magnetic permeability and cannot meet the above-mentioned demands. On the other hand, materials with high magnetic permeability such as permalloy are expensive, difficult to process into a desired shape, and have low strength so that they are easily broken when thinned. Therefore, using this type of material, it is difficult to make a yoke that is small, lightweight, and can withstand high-speed rotation.

(c) Purpose The present invention was made with attention to the above circumstances, and its purpose is to provide a compact and lightweight device that can withstand high-speed rotation and transmit high torque; To provide a magnetic coupling that can be easily and inexpensively manufactured.

(d) Structure In order to achieve the above object, the present invention provides a method in which the amorphous amorphous thin film has a polygonal cross-section by exposing both end faces in the width direction of the band-shaped amorphous thin film in the direction of the winding axis. The magnetic coupling is characterized in that the magnetic coupling is constructed using a yoke which is wound several times and bonded and solidified with a curable adhesive.

(e) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, an outer rotor 3 having a plurality of outer magnets 2 provided on the inner periphery of an outer rotor yoke 1 extends from a Ne turbine (not shown), and the outer rotor 3 An inner rotor 6 (not shown) is provided with inner magnets 5 having a plurality of poles corresponding to the outer magnets 2 on the outer periphery of an inner rotor yoke 4 disposed in a hollow part of the shaft center of the inner rotor 6.
It extends from the compressor.

The outer rotor yoke 1 is made by applying an adhesive (room-temperature curing epoxy adhesive) 8 made of epoxy resin to one surface of an amorphous thin film 7 made of Fe-Si-B amorphous alloy in the form of a thin tape (Fig. 3). The amorphous amorphous thin film is wound around a columnar core material 9 a plurality of times (FIG. 4), and the adhesive 8 is cured to bring the amorphous thin film 7 into close contact with the wound state, and then removed from the core material 9 ( (Fig. 5), and has a cylindrical shape with an octagonal cross section. Then, a predetermined portion of the inner circumference of the outer rotor yoke 1 is fitted onto the outer circumference of the tip portion 11a formed in an octagonal column shape of the outer rotor shaft 11 extending from the Ne turbine (not shown), and the inner circumference of the outer rotor yoke 1 is fitted. The outer magnets 2 are connected to the inner circumferential surface of the outer rotor yoke 1 at predetermined positions on the periphery, respectively, and the outer magnets 2 are connected to each other.
The poles are arranged in an array. (FIGS. 6 and 7) On the other hand, the adduction yoke 4 is made up of an adduction shaft 12 which has one surface of the amorphous thin film 7 coated with the adhesive 8 and extends from a He compressor (not shown).
The adhesive 8 was wound several times around the tip 12a formed in the shape of an octagonal prism (FIGS. 8 and 9), and the adhesive 8 was cured in this state to make the amorphous thin film 7 adhere tightly. The outer peripheral surface has an octagonal cross section. And this adduction yoke 4
The inner magnets 5 are connected to each surface of the outer periphery of the magnets, and the NS poles are arranged alternately (Fig. 10). Note that 13 is a housing surrounding this magnetic coupling.

If the configuration is like this, it is not shown in the diagram.
When the Ne turbine is driven by the pressure of Ne gas, the outer rotor 3 receives the applied driving force and rotates. At this time, since the outer magnets 2 of the outer rotor 3 and the inner magnets 5 of the inner rotor 6 are attracted to each other by magnetic force, the torque of the outer rotor 3 is increased by the rotation of the outer magnets 2. The torque is transmitted to the inner magnets 5 of the inner rotor 6, and the inner rotor 6 rotates in response to the applied torque. This rotation is then transmitted to a He compressor (not shown) and used to compress He gas.

In this way, the driving force of the Ne turbine is transmitted to the He compressor. Both the outer rotor yoke 1 and the inner rotor yoke 4 are made by wrapping the amorphous thin film 7 several times and bonding it with adhesive 8 as described above. Because it is a magnet, it has the strength to withstand centrifugal stress during high-speed rotation, and has high magnetic permeability. Therefore, it is possible to increase the attractive force between the outer magnet 2 and the inner magnet 5, and the magnet can be rotated at high speed. It is also possible to reliably transmit torque under such conditions. Furthermore, since molding is easy, the yoke having an octagonal cross section as shown in this embodiment can also be easily manufactured. In addition, since a small and lightweight yoke can be manufactured, the magnetic coupling can also be made smaller and lighter.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and is not limited to the case in which both the external rotation yoke and the internal rotation yoke are formed of an amorphous amorphous thin film, but only one of them can be formed of an amorphous amorphous thin film. It may be something you have done.

Further, the shapes of the external rotation yoke and the internal rotation yoke are not limited to the octagonal cross section, but may be trigonal to heptagonal or nonagonal or more. However, if the cross-section is polygonal, the magnet can be easily positioned, and the rotation can be reliably transmitted at the attachment portion to the external rotation shaft or the internal rotation shaft.

Further, the adhesive is not limited to one made of epoxy resin, and may be any adhesive as long as it has curability.

Furthermore, the amorphous thin film is not limited to the one made of the Fe-Si-B amorphous alloy, but may be made of other alloys or metals.

(F) Effects Since the present invention has the above configuration, the following effects can be obtained.

First, since the amorphous thin film has high magnetic permeability, it is possible to make a yoke that can form a sufficient magnetic circuit just by winding it thinly. Furthermore, a yoke made by winding such a thin film multiple times and adhesively curing it with an adhesive has high strength and can withstand large tensile stress caused by centrifugal force or the like. Furthermore, since the yoke has a polygonal cross-section, the magnet does not slip on the surface of the yoke even when transmitting a large torque, so that the large torque can be reliably transmitted. Therefore, it is possible to provide a magnetic coupling with sufficient strength and magnetic properties, in other words, a magnetic coupling that is small and lightweight and can withstand high speed rotation and transmit high torque. be.

Furthermore, since amorphous thin films can be manufactured continuously, costs can be reduced through mass production. Moreover, since a yoke of a desired shape can be formed simply by winding the yoke around the core material, there is no inconvenience that it takes time and effort to manufacture due to the difficulty of processing. Therefore, there is an advantage that a high-performance magnetic coupling can be manufactured at a relatively low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIGS. , Fig. 7 is a view from arrow A in Fig. 6, Fig. 8
Figures 1 to 10 are explanatory diagrams showing the steps for manufacturing and attaching the inner rotation yoke. 1...Abduction yoke, 2...Outside magnet, 3
... External rotor, 4 ... Internal rotor yoke, 5 ... Inner magnet, 6 ... Internal rotor, 7 ... Amorphous thin film, 8 ... Adhesive.

Claims (1)

[Claims] 1. Wrap the amorphous amorphous thin film multiple times to have a polygonal cross-section so that both end faces in the width direction of the band-shaped amorphous thin film are exposed in the direction of the winding axis, and then bond and harden with a curable adhesive. A magnetic cutlet spring characterized by being equipped with a yoke.