JPS6017737B2 - Flywheel rotor and its manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flywheel rotor that forms the core of a super flywheel energy storage system.

The super flywheel is a system that rotates at extremely high speeds and stores its rotational energy, so it is important to select materials that can withstand high circumferential speeds. Therefore, high specific strength (strength/specific gravity) is a parameter for selection. Therefore, composite materials such as fiber-reinforced resin (FRP in a broad sense) and fiber-reinforced metal are attracting attention. FIG. 1 and FIG. 2 show a flywheel rotor formed by conventional filament winding molding, which only strengthens the circumference in all directions.

In this figure, the fibers lb in the resin matrix la constituting the flywheel rotor 1 are oriented only in the circumferential direction, so the rigidity in the circumferential direction and the radial direction are very different, and the distribution of centrifugal stress during rotation. Let Ee be the elastic modulus in the circumferential direction and Er be the elastic modulus in the radial direction. Directional stress.
Fig. 3 schematically shows the distribution of centrifugal stress with e. As is clear from this figure, a rotor reinforced in the circumferential direction of the subordinate rotor is characterized by a particularly strong influence of anisotropy. The aforementioned flywheel rotor that is only strengthened in the circumferential direction has a strong variation in strength.

．． FIG. 4 shows the influence of the weave orientation angle 8 on the tensile strength in a tensile test of a unidirectionally reinforced composite material formed by filament winding. In this figure, when 8=00, the load is borne by the fibers lb in the circumferential direction, so the strength is very good, and the normal fiber volume content Vf is 0.6 to 0.7. It has a strength of about 80 to 100 kg/rigidity 2. However, in the radial direction perpendicular to 0=900, that is, the fiber lb, the fiber l
Since b has no load, its strength is about 3 to 4k9/2 ribs, and the occurrence of fracture is currently very low at around lk9/2 legs. Therefore, the centrifugal stress during rotation easily reaches its limit in the radial direction, so the range in which safe rotation can be obtained is extremely limited. In other words, secondary factors destroy the characteristics of the composite material. In view of the above points, an object of the present invention is to provide a flywheel rotor that can be handled as stable in terms of strength and rotation technology by devising the total weave orientation, and an apparatus for manufacturing the same. It is something to do. The feature of the present invention is that in the circumferentially strengthened rotor of the subordinate rotor, there is too much margin in strength in all directions around the circumference, and the strength in the radial direction is extremely low.

Therefore, we propose a flywheel rotor that improves the strength in the radial direction by orienting fibers in the radial direction as well as increases the rigidity and is effective against deformation. That is, ``the inner peripheral part of the flywheel rotor is a fiber layer formed by the conventional circumferential filament winding method, and the outer peripheral part is a radial fiber layer reinforced in the radial direction.
In such a flywheel rotor, the inner periphery bears the centrifugal stress in the circumferential direction that accompanies rotation, and the outer periphery bears the load for the radial stress.Also, the restraint of the fibers in the radial direction prevents deformation. This makes it possible to obtain a flywheel rotor that is superior in strength and rotational stability to a secondary rotor.In addition, fiber winding, especially radial winding, can be carried out using inexpensive equipment. Embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 shows a flywheel rotor according to the invention which is also strengthened in the radial direction.

The flywheel rotor 2 of the present invention starts with a mandrel 3
Next, fibers such as glass fibers or carbon fibers impregnated with resin are wound in the circumferential direction of the rotor and hardened to form the circumferential fiber layer 4.

Thereafter, the shape of this circumferential fiber layer 4 is determined, and the surface is polished. Next, resin-impregnated fibers are further wound in the radial direction of the outer surface of the circumferential fiber layer 4 and hardened to form the radial fiber layer 5, thereby completing the process. The amount of winding of the radial fibers in this radial fiber layer 5 is:
Although it varies depending on the type of fiber and resin, fiber volume content, shape, etc., these can be easily determined by the finite element method or the like. Next, the procedure for winding the radial fiber layer 5 will be explained with reference to FIG. 6. The fibers F are wound around the outer surface of the disc-shaped circumferential fiber layer 4 to form the radial fiber layer 5. The fiber density in the radial direction is adjusted by the winding interval and number of windings. In general, when the circumferential fiber layer 4 is thin and disc-shaped, the fiber layer 4 tends to bend at the outer periphery.
Since there is a risk of the fibers being damaged due to stress concentration, we added a curvature to this part, and furthermore, the total weave F is
Forming is facilitated by providing slits 6 at regular intervals on the outer peripheral end surface of the circumferential fiber layer 4, as shown in Figure 7, to prevent it from slipping. The shape of the circumferential fiber layer turtle is as shown in the crab diagram.
If the nsoid shape is used, the contact area between the fibers F and the fibers at the center of the circumferential fiber layer increases, increasing the frictional force, thereby making the longitudinal weave orientation stable. .

An example of a manufacturing apparatus for the flywheel rotor 2, particularly a winding forming apparatus with a radial weave orientation, will be described with reference to FIG.

Since the circumferential fiber layer 4 can be formed by the usual filament winding method, the radial fiber node winding forming apparatus will be mainly described here.

7' is a stand that supports the roving of fiber F. 8 is resin 9
It is a resin tank having a It is a 1M radial winding machine.
A rattan 11 on which four circumferential fiber layers are mounted is obliquely attached to a rotating body 13 via a pulse motor 2 so that one point of the circumferential fiber layer 4 makes three-dimensional orbital movement and rotational movement. ing.

The rotating body 13 is rotated by an electric motor 15 via a transmission 14. When the rotating body 13 rotates, the desired radial winding is achieved if one end of the fiber F is fixed to the circumferential fiber layer 4. However, if the shaft 11 remains fixed to the rotating body 13, As a result, the radial winding is performed only at certain locations on the circumferential fiber layer 4.Therefore, the rotation of the rotating body 13 is detected by the detector 16, and a corresponding pulse signal is sent to the pulse motor 16. By inputting the input, the shaft 11 rotates, so that the fibers F can be wound in a constant radial direction over the entire surface of the circumferential fiber layer 4.The angle of the fibers oriented in the radial direction can be adjusted by adjusting the rotation speed of the electric motor 15. The angle can be changed using the angle adjuster 17 of the shaft 11.

The density of the fibers F is determined by the rotation angle of the shaft 11 and the rotating body 13.
It can be determined by the total number of rotations. Other examples of the rotation mechanism of the shaft 11 are shown in FIGS. 10 and 11.

This example is composed of a gear 17 attached to a shaft 11 and a gear-shaped stopper 8 that engages with the gear 17. The stopper 18 has the same pitch as the gear 17. Now, when the rotating body mass 3 is rotated by the electric motor 15, the gear 2 revolves around the stopper 8,
When it hits the gear-shaped stopper 8 once during this revolution, it rotates, and the shaft 11 rotates by the amount of engagement.
will rotate. This repeated operation results in even winding in the radial direction. To change the winding pitch, the pitch of the gear 17 can be changed. As explained above, according to the present invention, the occurrence of cracks in the radial direction, which is a fatal drawback of conventional flywheel rotors reinforced only in the circumferential direction, can be prevented by orienting fibers in the radial direction as well. ,
Furthermore, we were able to provide a rotor that is stable both in terms of strength and rotational technology, and furthermore, by reducing the amount of unbalance, we were able to significantly increase the limit circumferential speed.

This made it possible to put energy storage systems into practical use using flywheels. Further, according to the present invention, mass production and automation are possible. Brief explanation of the drawings Figure 1 is a front view of a conventional flywheel rotor reinforced only in the circumferential direction, Figure 2 is a view taken along line D-D in Figure 1, and Figure 3 is a conventional reinforced flywheel rotor in the circumferential direction. Centrifugal stress distribution diagram due to rotation of the flywheel rotor, Figure 4 is a conventional flywheel.

- A diagram illustrating the variation in strength of the unidirectional reinforcing material in the outer shell. Figure 5 is a longitudinal cross-sectional view of the flywheel rotor of the present invention.
FIG. 6 is a diagram showing a total winding procedure for radial fibers in the flywheel rotor of the present invention, and FIG. Fig. 8 shows an example of a shape for obtaining stable radial weave orientation in the flywheel row outer shell of the present invention, and Fig. 9 shows the configuration of the manufacturing apparatus, particularly the radial fiber orientation winding forming apparatus of the present invention. 10 are diagrams showing other examples of the autorotation mechanism in the manufacturing apparatus of the present invention, and FIG. 11 is a phantom-phantom line arrow view of FIG. 10.・2... Flywheel rotor, 4... Circumferential fiber layer, 5... Radial fiber layer, 7... Stand, 8...
Resin tank 9... Resin, 10... Radial winding machine, 11.
...Marrow, 12...Pulse motor, 13...Rotating body.

Boat 1 XZ diagram Pair 3 figure pair of 4 boxes Pair 5 diagram Pair 5 diagram Figure 7 of Labor Good figure 8 Bacteria Figure 10 group il diagram

Claims (1)

[Scope of Claims] 1. A flywheel rotor characterized in that a radial fiber layer in the radial direction of the rotor is formed by a filament winding method on the outer surface of a circumferential fiber layer in the rotor circumferential direction by a filament winding method. 2. A means for supplying fibers made by bundling single fibers, a resin tank for impregnating the fibers with resin, a shaft around which the fibers impregnated in the resin in the resin tank are wound, and a means for rotating this shaft. a circumferential winding machine having an inclined shaft having a circumferential fiber layer formed by the circumferential winding machine and on which the fibers are wound in a radial direction; a means for revolving this shaft; A flywheel rotor manufacturing device comprising a radial winding machine having means for slightly rotating a shaft relative to rotation and revolution.