JPS59117448A - Manufacture of squirrel-cage rotor - Google Patents

Abstract

PURPOSE:To improve the workability and to improve the quality of a squirrel- cage rotor by setting the welding conditions and positioning of both ends of conductors which form a plurality of squirrel cages of the rotor under the control by a computer and welding by an electron beam to a shortcircuiting ring. CONSTITUTION:Both ends of a laminated core are clamped by a shortcircuiting ring (only one is shown), and conductors 2 are inserted into a notch of a figure formed at the ring 3 and a core. An electron beam is emitted from a rotational shaft direction (perpendicular to the paper surface) and welded by the electron beam between the ring 3 and the conductors 2. The squence of welding and the welding conditions are controlled by a program which is stored in a computer, the welding sequence is selected at the welding points to separate from each other such as W01, W02,..., W0n, the beat sequence of the respective welding points is selected like WS1, WS2, WS3 or WS1, WS2, thereby preventing the overheat at one local position. In this manner, the workability is improved, the manufacture of improper product is prevented, thereby eliminating most inspections.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a squirrel cage rotor in which conductors of the squirrel cage rotor and short-circuit rings are joined by electron beam welding. - [Technical background of the invention and its problems] Conventionally, the squirrel cage rotor of an induction motor has an iron core (
It is manufactured by inserting both ends of the plurality of conductors (2) arranged in 1) into the grooves (3a) of the shorting ring (3) and joining them by brazing (4) or arc welding (5). Ta.

However, the brazing (4) is mainly performed by silver brazing, and the brazing itself has low reliability and is prone to defects, and there is a risk that the brazed portion may peel off during use. For this reason, arc welding (5) has been used to improve reliability, but arc welding of copper, which is a conductor, is prone to defects such as blowholes.
It had drawbacks such as requiring a great deal of effort to modify and requiring strict inspection.

[Purpose of the invention]

The present invention was made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a highly reliable and efficient manufacturing method for a squirrel-shaped rotor, in which the conductor and the short-circuit ring are joined by computer-controlled electron beam welding. purpose.

[Summary of the invention]

That is, the positioning is set as in a welding process under electronic computer control, and electron beam welding is automatically performed sequentially to join.

[Embodiments of the invention]

An embodiment of the present invention shown in the drawings will be described below. Multiple conductors (2) arranged in the iron core (1) as shown in Figure 1
Both ends of the lamp are inserted into the short-circuiting ring (3), fixed with a suitable lamp jig, and electron beam welding is performed. When the width A of the short-circuit ring (3) to be welded is small, the welding position is downward, and when it is large, the welding position is horizontal. The joints between the conductor (2) and the shorting ring (3) are welded in order W as shown in Figure 2. 1~
Won is programmed so that it is located as far away as possible, and each welding point is placed at a position away from the beat order WS, ~W8,1 (so that it is two, as shown in Fig. 3(a) or (b)). The selection is made depending on the conditions such as the size of the rotor and the fixing jig.The combination of welding order and beat order is programmed into an electronic computer, and the electron beam (6) is irradiated in the axial direction as shown in Figure 4. Perform welding.

Next, the effect will be explained. The joint between the conductor (2) and the short-circuit ring (3) is controlled by an electronic computer so that the electron beam (6) is beat in the axial direction at a position as far apart as possible (along the joint surface in two directions). Since welding is carried out by using electron beam welding, not only is the welding efficiency high, but also the start and end ends of the weld are absorbed into the short circuit ring.Therefore, there is no need to remove the start and end ends of the weld, which is a disadvantage of electron beam welding. Further, as shown in FIG. 5, the back side of the weld is slightly recessed to form a small back beat (6a), which further improves reliability by resisting stress caused by heating and cooling of the conductor (2).

[Effect of idea]

As described above, according to the present invention, the conductor of the squirrel-cage rotor of the induction motor is inserted into the groove of the short-circuit ring, the welding conditions and positioning are set by computer control, and the electron beam is sequentially and automatically directed in the axial direction. Since welding is performed by irradiation, good welds can be obtained with little need for inspection of individual joints. In addition, individual positioning can be performed correctly using computer control, and by selecting welding positions evenly with respect to the short-circuit ring, they mutually cancel out deformation, preventing large amounts of deformation from accumulating, and preventing welding from the beginning and end of the welding process. Since no defects occur, there is no need for post-processing, which has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a joint between a conductor and a short-circuit ring of a conventional squirrel cage rotor, and FIG. 2 is a side view showing a welding sequence in an embodiment of the squirrel cage rotor manufacturing method of the present invention. Figure 3(a),
(b) is a side view showing the beat order, FIG. 4 is a perspective view showing the state of electron beam irradiation, and FIG. 5 is a perspective view showing the state after electron beam welding. 1...Iron core 2...Conductor 3...Short ring 3a...Groove 6...Electron beam 6a...Back bead agent Patent attorney Inoue -Male Figure 1 Figure 2 Figure 3 (α) (b) Figure 4

Claims (1)

[Claims] Both ends of the multiple conductors arranged in the squirrel cage rotor are inserted into the grooves of the shorting ring, and the welding conditions and positioning are set by computer control, and electron beam welding is automatically performed in sequence to join them. A manufacturing method for a featured squirrel cage rotor.