JPS58116053A - Double squirrel-cage rotor for rotary electric machine - Google Patents

Abstract

PURPOSE:To improve the strength against the circumferential stress by forming a projection engaged in a circumferential direction by bending a slit for coupling an outer slot and an inner slot between the outer slot and the inner slot. CONSTITUTION:Projections 8, 9 and 10, 11 to be engaged in a circumferential direction by bending a slit 4 for coupling an outer slot 2 with an inner slot 3 in a dovetail shape are formed, and aluminum or its alloy is, for example, cast as an inner conductor 6 as a nonmagnetic intermediate material 7 entirely in the slit 4. When thus constructed, even if strong circumferential stress is applied due to high speed rotation, the material 7 between the projections 8, 9 and 10, 11 and the engaging surfaces 8a, 9a and 10a, 11a is narrowed to be rigidly engaged. Accordingly, no deformation such as opening of the slots 2, 3 and the slit 4 does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cage-shaped prisoner 1 trochanter for two things in the rotation 111 of a tempura dragon 1; machine, a visiting synchronized engine, a permanent magnet type synchronous night, and a moving Psv-. This invention relates to the structure of a slit connecting the inner and outer slots of a double squirrel cage type 1!11 trochanter.

A conventional double squirrel cage rotor is shown in FIG. An iron core made of 7 laminated punched silicon m plates, 2 outer slots formed on the surface near the 10 periphery of the ridge, 3 inner slots formed on the l1fI core side from the outer slots 2, 4 outer 1t '
iJ, a slit connecting slot 2 and inner slot) 311tJ, 5 is an outer conductor with high electric resistance housed in the outer slot, 6 is an inner conductor with low electric resistance housed in the inner slot, 7 is inside slit 4 It is an inclusion that is placed as necessary in the

The inner conductor 6 and the inclusion 7 are usually formed integrally by casting aluminum or an alloy thereof.

Recently, many induction motors and the like are driven by inverters, and these types of motors are required to withstand high speed rotation and have high actance from the viewpoint of reducing harmonic loss. However, in order to increase the reactance in a conventional double squirrel cage rotor, it is necessary to make the inner conductor 6 deeper, that is, to make the slit 4 longer. Slot 2.3 for circumferential stress based on
Also, the slit 4 may be deformed, which is not preferable.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide a 21 squirrel cage rotor that can withstand high speed rotation and has a large reactance.

To achieve this object, the present invention provides a double squirrel cage rotor having a slit connecting an outer slot and an inner slot, in which the slit is bent in the circumferential direction. It is characterized in that an engaging protrusion is formed, and an inclusion is interposed between at least the engagement surfaces of the protrusion within the slit.

Hereinafter, various embodiments of the present invention will be explained in detail with reference to the drawings.

2 and 3 show a first embodiment of the invention. In this embodiment, the slit 4 connecting the outer slot 2 and the inner slot 3 is bent into a dovetail shape to form projections 8 and 9, 1o and 11 that engage in the circumferential direction, and the entire inside of this slit 4 is The non-magnetic inclusion 7 is made of the same material as the internal conductor 6, for example, aluminum or an alloy thereof.

When K11l is formed in this way, even if a strong circumferential stress is applied due to high speed rotation, the projections 8 and 9.10. ! = 11 are firmly held together by sandwiching the inclusion 7 between the engagement rkJ8a and 9a and Ion and lla, so that deformation such as being surrounded by the slots 2, 3 and the slit 4 does not occur. Furthermore, since the length of the slit 4 is increased, the reactance is also increased, and high-wave loss can be reduced. In addition,
In FIGS. 2 and 3, 1 is an iron core, and 5 is an outer conductor.

The fourth factor represents a second embodiment of the invention. This example is
The shape of the slit 4 is the same as in the first embodiment, but
The slit 4 is formed so as to connect the outer slot 2 and the inner slot 3 which are located at different positions in the circumferential direction (adjacent in this case), so that the slit 4 as a whole is inclined with respect to the radial direction.

With this configuration, even though the dimensions of each part are the same as in the first embodiment, the length ζ of the slit 4 is further reduced.
Furthermore, the reactance can be increased. Also,
Since the length of the slit 4 is the same as that of the first embodiment, the radial distance between the inner and outer slots 2.3 can be narrowed.
The outer diameter of the core becomes smaller, making it suitable for higher speed rotation. The configuration and operation other than this are the same as the first embodiment, so the same parts are given the same reference numerals and detailed explanations will be given in 1.
Omitted.

FIG. 5 depicts a third embodiment of the invention. This example is
By bending the slit 4 connecting the outer slot 2 and the inner slot 3 into a substantially Z-shape, protrusions 8 and 9 that engage in the circumferential direction are formed, and a non-magnetic material is interposed between the retaining surfaces 8a and 9a of the protrusions. For example, a piece of stainless steel is implanted as the object 7. Even with this configuration, the same effects as in the first embodiment can be achieved.

In addition, in the first and second embodiments described above, the inclusion may be implanted only between the engagement surfaces of the protrusions, as in this embodiment.

FIG. 6 shows a fourth embodiment of the invention. This example is
The projections 8 and 9 are formed by bending the slit 4 into a substantially S-shape, and the entire inside of the slit 4 is inlaid with an inclusion 7, such as aluminum or an alloy thereof. Other than this, it is the same as the third embodiment, so the - part is given the 4- symbol. like this! When set to H, the length of the slit 4 can be made longer, and the arrow 5 for circumferential stress can be increased! The R degree can be increased.

FIG. 7 shows a fifth embodiment of the invention. This fruitful row is
The shape of the slit 4 is approximately S-shaped as in the fourth embodiment, but a reinforcing rod 12 made of steel or the like is placed inside the inner slot 3.
It penetrates through.

The reinforcing rod 12 is inserted in advance before the inner conductor 6 is cast, and is fixed in the inner slot 3 by casting the inner conductor 6. Although this reinforcing rod 12 is not shown, the iron core l
It is integrated with reinforcing rings at both ends in the axial direction and, if necessary, in the middle, which serves to further improve the strength against high-speed rotation.

The configuration and effects other than this are the same as those of the fourth embodiment, so the same parts are given the same reference numerals and the explanation will be omitted.

In each of the above embodiments, an example has been described in which the inner conductor is formed by casting, but the inner conductor may be provided by being inserted into the inner slot.

As explained above, according to the present invention, a protrusion is formed between the outer 1111 slot and the inner slot that engages in the circumferential direction by bending the slit connecting the two, so that the strength against circumferential stress is increased. Improved speed and speed. Furthermore, since the slit length is increased, the reactance is increased, which has the advantage of reducing harmonic loss by /J%.

[Brief explanation of drawings]

Fig. m1 is a partial end view showing an example of a conventional double squirrel cage rotor, Fig. 2 is a 1-minute end view of the double squirrel cage rotor according to an embodiment of the present invention, and Fig. 3 is a partial end view showing an example of a conventional double squirrel cage rotor. Enlarged end views of the main parts of the child, Figures 4 to 711! FIG. 2 is an enlarged end view of a portion or a main part of a two-electrode corner rotor according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Iron core, 2... Outer slot, 3... Inner slot, 4... Slit, 5... Outer conductor, 6...
・Inner conductor, 7... inclusion, 8, 9, 10.11...
-Protrusion, 8a. 9a, 10a, lla... engaging surface, 12... reinforcing rod. I:, 1 busy Figure 1 Figure 2 tW Figure 5 285 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] l An iron core, an outer conductor placed in an outer slot near the shoulder of the iron core, an inner conductor placed in an inner slot on the thicker side thereof, and the outer slot and the inner slot. and a slit connecting the outer slot and the inner slot, the slit is bent between the outer slot and the inner slot to form a protrusion that engages in the circumferential direction, and at least the engagement of the protrusion in the Tsumugi slit is A twin squirrel-cage rotor for a rotating electric machine with inclusions interposed between the surfaces. 2. A 2fi squirrel cage rotor for a rotating electrical machine according to claim 1, wherein the inclusion is a non-magnetic material. 3 In claim 1, the inclusion is l1
A 2-m squirrel cage rotor for a rotating electric machine with a t-V image of 4#L metal cast in the iT distribution slit. 4%ffClaim 1A double squirrel cage rotor with one rotation, characterized in that a slint connects an outer slot and an inner slot that are located at different positions in the circumferential direction. 5. According to claim 1, the rotation 'II[ The machine's double squirrel cage rotor.