JPS60148370A - Rotor of superconductive rotary electric machine - Google Patents

Abstract

PURPOSE:To absorb the axial thermal deformation of an inner cylinder while holding the inner cylinder by implanting a columnar pin to one of inner and outer cylinders when bonding the inner and outer cylinders, providing a circular hole in which the pin is slidable at the other, and combining the both cylinders. CONSTITUTION:One end of an inner cylinder 2 is coupled with a coupling shaft 3 to restrict the axial, normal and tangential motions, columnar pins 7 projected axially are equally disposed on the end face of the other end, a circular hole 8 in which the pins 7 are slidable is formed in the inner wall of the shaft 5 oppositely to the pins, and both are engaged. The structure is simplified by this construction, and a complicated flexible support can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotor of a superelectric rotating electric machine, and more particularly to a thermal deformation absorption mechanism between room temperature and extremely low temperature.

[Technical background of the invention]

In recent years, superelectric rotating electric machines have been developed that use superconducting stones for their rotor field windings.The superconducting field windings are heated to extremely low temperatures in order to maintain their superelectric properties. The rotor is composed of a cryogenic inner cylinder equipped with a superconducting field winding immersed in liquid helium and an ordinary temperature outer cylinder located outside of the cryogenic inner cylinder to maintain the cryogenic temperature. It has a double cylindrical structure, and the inner cylinder is connected to the outer cylinder at both ends to maintain the position and mutually transmit torque.

FIG. 1 is a sectional view showing the schematic structure of a conventional rotor. That is, the inner cylinder 2 holding the superconducting field winding 1 is
Heat contraction occurs when the inner cylinder is cooled to an extremely low temperature below the current temperature by a medium, but one end of the inner cylinder is connected to the joint shaft 3 and movement in the axial direction, normal line, and tangential direction is restrained. The other end is connected to the joint shaft 5 at the other end via a flexible pot (6f) having a spring mechanism, and has a structure that restricts freedom in the normal and tangential directions but absorbs thermal contraction in the axial direction.

. However, both the inner and outer cylinders are cooled down to room temperature during rest, including during manufacturing, and thermal deformation in the axial direction of the inner cylinder occurs due to the temperature difference between room temperature and cryogenic temperature when starting up and stopping. Therefore, the superconducting rotor requires a holding mechanism that absorbs the axial thermal deformation of the inner cylinder and restrains other deformations or displacements of the inner cylinder relative to the outer cylinder.

[Problems with background technology]

As a mechanism for allowing the degree of freedom in the axial direction of the inner cylinder and restraining other degrees of freedom, a spring support mechanism called a flexible support with a pU-shaped cross section has been devised, but the complexity of the shape There were manufacturing problems, such as difficulty in processing due to the cylindrical structure and difficulty in assembling inside the inner cylinder.

In addition, especially when increasing the size of the rotor, it is necessary to increase the thickness of the spring plate in order to withstand the load of the inner cylinder due to the increase in weight and thermal deformation of the inner cylinder. In order to absorb thermal deformation in the axial direction, the plate thickness must be reduced, making selection of the plate thickness difficult and limiting the scale of application.

[Purpose of the invention]

The present invention was made in view of the above-mentioned drawbacks, and has the function of absorbing thermal deformation in the axial direction while constraining the degrees of freedom in the normal and tangential directions of the circumferential surface of the inner cylinder with respect to the outer cylinder. It is an object of the present invention to provide a rotor for a superconducting rotating electric machine that does not require processing, facilitates work during manufacturing and assembly, and is applicable to large-capacity machines.

[Summary of the invention]

In order to achieve the above object, in the rotor of the superconducting rotating electric machine of the present invention, a cylindrical pin is implanted in one side and a circular hole through which the pin can slide is provided in the other side when joining the inner cylinder and the outer cylinder. By combining these, thermal deformation in the axial direction of the inner cylinder can be absorbed while holding the inner cylinder.

[Embodiments of the invention]

FIG. 2 shows an embodiment of the invention.

One end of the inner cylinder 2 is connected to a connecting shaft 3 to restrain movement in the axial direction, normal direction, and tangential direction, and cylindrical pins 7 protruding in the axial direction are equally distributed on the end face of the other end, and the pins 7 are arranged opposite to each other. A circular hole 8 in which the pin can slide is provided in the inner wall of the joint shaft 5, and the two are fitted together.

In this way, compared to the conventional structure, the structure is simplified and complicated while having the same function of absorbing thermal deformation in the axial direction while restraining the freedom in the normal and tangential directions of the inner cylinder. No need for flexible support processing.
Inner cylinder and flexible support 6 in inner cylinder 2
This has the advantage of avoiding manufacturing difficulties such as tightening of bolts and joining of the three-layered outer cylinder 4, flexible support, and joint shaft 5.

3 and 4 show other embodiments of the present invention.

FIG. 3 shows the structure shown in FIG. 2 in which a groove 9 is provided in the axial direction at the end of the pin 7 to facilitate the sliding of the pin.

In Fig. 4, pins 7 are equally distributed on the joint shaft 5, and a circular hole 10 is provided on the end face of the inner cylinder 2 opposite to the pins 7, and the diameter of the circular hole 10 is the same as that of the inner cylinder. The inner cylinder 2 contracts when the temperature is extremely low to firmly fasten the pin, and the inner cylinder expands when the temperature is relatively high so that the pin can slide.

〔Effect of the invention〕

As described above, according to the present invention, in the rotor of a superconducting rotating electrical machine that includes an inner cylinder cooled to an extremely low temperature and an outer cylinder at room temperature, freedom in the normal and tangential directions of the inner cylinder with respect to the outer cylinder is achieved. It is possible to absorb thermal deformation in the axial direction while restraining it.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a rotor of a conventional superconducting rotating electric machine. 1...Superconducting field winding, 2...Inner cylinder, 3.5...
- Joint shaft, 4...outer cylinder, 7...pin, 8.
10... circular hole, 9... groove.

Claims (1)

[Claims] an inner cylinder enclosing a superconducting winding; an outer cylinder surrounding the inner cylinder concentrically with the cylinder; and a shaft member joined to an end of the outer cylinder. A super-rotating rotor characterized by connecting the end of the inner cylinder to the end of the inner cylinder by a hole and a pin that fits loosely into the hole.