CS253982B1 - Tool for welding of surface conductors of disk rotors of rotating electric machines - Google Patents

Abstract

The main part of the device is a support plate with a cylindrical cavity, closed by a lid, and in the cylindrical cavity there are two clamping discs with three intermediate rings, adjacent to each other, between which a disk rotor with flat conductors is clamped, while the upper clamping disc is provided with a centric hole at the location of the first intermediate ring and holes for welds located on the pitch circle at the location in front of the second intermediate ring.

Description

The invention relates to a device which enables the electron beam welding of the surface conductors of disc rotors of rotating electrical machines in a vacuum chamber.

Conventional known rotating electrical machines utilizing the magnetic field force effects on the current in a conductor have a cylinder-shaped rotor of ferromagnetic material with longitudinal grooves in which the conductors of the current are accommodated. The moment of inertia of such rotors is considerable and therefore not suitable for servosystems. For this purpose, special electric rotary "machines" are used with a rotor consisting of thin, flat conductors in two or more layers which are interconnected as desired. Spot welding is best suited for connecting the ends of flat conductors, which can be made either by a micro-plasma arc, a laser or an electron beam due to the small size of the conductors. Since the conductors are copper, they must be welded in a perfect protective atmosphere or vacuum. The best welding results can be achieved by electron beam vacuum. A suitable fixture is necessary for welding, by means of which the welded conductor is to be pressed tightly together.

The device for the above described electron beam electrode beam welding of disc rotors of rotating electric drawbars resolves the invention which is based on a cylindrical cavity support plate removably closed by an annular lid, wherein two cylindrical discs are provided in the cylindrical cavity. between them is clamped disc disk with flat conductors, the upper clamping disk is provided at the point where the first intermediate ring ends with a centric hole and in the place before the second intermediate ring holes

3,253,982 for welds placed on a pitch circle, the number of which is determined by the number of flat conductors to be welded and whose diameter is at least one tenth greater than the width of the welded conductor.

The main advantage of the fixture is easy and reproducible assembly ensuring perfect execution of several hundred joints in a row. Furthermore, it enables automatic feed of successive welded conductors, especially in series production of disc rotors.

The device according to the invention will be explained in more detail with the aid of the accompanying drawing in which, in FIG.

The main part of the jig are two clamping discs 1 and 2. The lower clamping disc 2 abuts the bottom of the support plate 2, with its three intermediate rings a, b, c protruding above the base of the disc 2. The lower clamping disc 2 accommodates a diac rotor 10 for welding conductors 6 and adjoins the upper clamping disc 1. three abc rings that are identical to abc rings on the lower clamping disc 2. Both clamping discs 1 and 2 are preferably made of a thermally conductive material, for example copper, with abutting rings abc of approximately square cross section at a height equal to approximately three times the thickness of the flat conductors 6. The upper clamping disc 1 is provided at the end b holes d located on the pitch circle as many as the number of welded flat conductors 6 of the disc rotor 10 required. Depending on the diameter of the pitch circle chosen, 70 or more weld holes can be placed in the circle.

The weld holes d must be at least one tenth larger than the width of the flat conductor 6 to be welded. The assembled jig with centered conductors 6 at the desired positions in the holes d and above the centrical hole of the upper clamping disc 1 is clamped by the cover 5 by means of screws 5,

The jig with inserted and retracted flat wires 6 of the disc rotor at the weld locations is inserted into the vacuum working chamber of the electron welder, where it is clamped into a rotary motion mechanism so as to ensure accurate rotation around the center of the pitch circle. After reaching the working vacuum is then considered uniform

AND

- 4 253 982 rotating the fixture with the disc rotor clamped brings the focused electron beam to the center of the hole d for the flat conductors 6 of the disc rotor 10.After the weld is terminated in the holes of the pitch circle d, the focused electron beam is fed to the wires projecting around With the same rotational feed, welds of the flat conductors 6 on the inner circumference of the disc rotor 10 are made.

The welding process described above can be easily automated in mass production *

Claims (1)

An electron beam spot welding tool for disc rotors of rotating electrical machines, characterized in that it consists of a support plate (3) with a cylindrical cavity detachably closed by an annular lid (5), wherein two cylindrical discs (1 and 2) are located in the cylindrical cavity. ) provided with three intermediate rings (a, b, c) adjacent to each other, between which a disc rotor (10) with flat conductors (6) is clamped, the upper clamping disk (1) being provided at the point where the first intermediate ring (a) ends apertures and in place of the second intermediate ring (b) holes (d) for welds located on the pitch circle.