JPS61218340A - Rotor for rotary electric machine - Google Patents

Abstract

PURPOSE:To increase allowable load and enable filler metals to be removable even after a rotor rim is mounted, by forming grooves for fitting the filler metals, in a triangular shape without the acute angle 'corner'. CONSTITUTION:For the outer periphery of a rotor rim 3, a plurality of dovetails 9A for magnetic poles are provided, and the poles 4 are fitted there. A coil support 6 is provided between the poles. For the position for fitting the coil support 6, a triangular notched groove 9C is provided, and a filler metal 11 inserted almost evenly is fitted on the groove. For the filler metals 11, screw holes for fitting bolts 7 for fitting coil supports are provided. The triangular groove 9C is extended to the section near the dovetail 9A, and the filler metal 11 is arranged with the length S coming to the point M and the point N of the magnetic pole and is formed in a beam shape against a centrifugal force (f).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotor for a salient pole rotating field type rotating electric machine, and particularly to an improvement in the structure of a mounting portion of a coil support for a magnetic pole and a magnetic pole coil.

[Background of the invention]

A conventional rotor of this type is described in Japanese Patent Application Laid-Open No. 59-83551. The main structure is shown in FIGS. 2 and 3.

Figure 2 is a longitudinal sectional view, Figure 3 is Figure 2C), 1I7
11 Arrow 0 plane @ 'tl' h Machine In FIGS. 21 and 3, a spider 2 is attached to the 101 rotational axis, and a rotor rim 3 is attached to the outer periphery of the spider 2. A plurality of magnetic pole dovetails 9A are provided on the outer periphery of the rotor rim 3, and the magnetic poles 4 are attached thereto. In such a rotor with a relatively high rotation speed, the coil 5 of the dimagnetic pole 4 may bulge in the circumferential direction, that is, in the R direction shown in FIG. 3, due to the centrifugal force caused by rotation. Therefore, in order to prevent this, a coil support 6 is provided between the magnetic poles. To attach the coil support 6, an auxiliary dovetail 9B is provided on the rotor rim 3, a filler metal 8 is inserted therein, and the coil support 6 is tightened to the filler metal 7 with a bolt 7 so as to be in contact with the coil 5 without any gap.

On the other hand, when the magnetic pole 4 rotates, a centrifugal force P is generated, but the fitting part with the magnetic pole dovetail 9A supports this force, and the magnetic pole 4
to hold it in its normal position. A component Q of the centrifugal force P acts on the above-mentioned fit-in portion.

In the conventional structure, the rotor rim 3 has a magnetic pole dovetail 9.
Since A and the auxiliary dovetail 9B are processed in the same plane,
In terms of strength, the most dangerous area is between AB or CD. In other words, the component Q of the centrifugal force P of the magnetic pole 4 causes a shear stress due to Q and a bending stress due to the bending moment Qxt to occur in part AB, and part AB needs to withstand the combined stress, but depending on the root stock, , AB may be difficult to increase to the extent required for strength, and this has the disadvantage of making it impossible to design this part.

Also, as a way to reduce the above-mentioned drawbacks,
There is a method in which the auxiliary dovetail 9B'e is not provided over the entire length of the rotor rim stacking height L, but only the length Hr of the filler metal 8 is provided, but in this case, since the filler metal 8 is trapezoidal, the rotor rim height is After this, it cannot be fitted into the auxiliary dovetail, but a method is included in which it can be fitted during the rotor rim loading process.

Therefore, it is troublesome and requires care to prevent forgetting to fit the rotor rim when loading the rotor, and once the rotor rim is loaded or after operation in the future, some kind of trouble may occur with the filler metal 8. Even if it becomes necessary to remove or replace the rotor rim, it can be replaced without disassembling the rotor rim. Disassembling the rotor rim means disassembling most of the rotor, which has the drawback of requiring a long construction period and a large amount of cost.

In addition, since the B or 0 point of the auxiliary dovetail is an acute "corner", there is a stress concentration and it is not possible to take a high stress, that is, a high allowable load of the component force Q cannot be taken.

[Purpose of the invention]

An object of the present invention is to provide a rotor that has grooves that increase allowable load and allow free attachment and detachment of filler metal even after the rotor rim is stacked.

[Summary of the invention]

The present invention provides a triangular groove instead of the conventional trapezoidal auxiliary dovetail, thereby increasing the load bearing area and increasing the acute angle.
This eliminates the "corner" and allows the filler metal to be attached and removed freely.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1, 4, 5, and 6.
This will be explained with reference to FIG.

2.・Figure 4 is a sectional view of essential parts of the rotor of the present invention, Figure 5 is a plan view taken along the IV-IV arrow in Figure 4, and Figure 1 is a sectional plan view taken along the ■-■ arrow in Figure 4. It is.

In the present invention, as shown in FIG. 1, a triangular notch 1li90 is provided at the position where the coil support 6 is to be attached, and the filler metal 11 is fitted into the groove almost uniformly.

The filler lIK has a screw hole for attaching the fill support mounting bolt 7, and the centrifugal force f of the coil support 6 is transmitted to the filler 11 through the entire bolt 7, which is the same as the conventional method. However, in the present invention, these centrifugal forces are reduced by M of the magnetic pole 4.
It is characterized by being supported at the and N points. As shown in FIGS. 1 and 7, the triangular groove 9C has a length close to the dovetail 9A, and the length S of the filler metal 11 that is applied to the M and N points of the magnetic pole is defined as the centrifugal force f. On the other hand, the filler metal 11 forms a beam state. In this way, the depth of the triangular groove 9C of the present invention is 2 compared to the groove depth of 1 in the conventional method of receiving centrifugal force on the f+ surface of the trapezoidal groove.
can be made shallower. Also, as is clear from FIG. 7, the groove bottom is a single flat surface, so there are no sharp corners. Therefore, the distances E-F' and G-J from the corner of the magnetic pole dovetail' and i9x to the bottom of the triangular groove can be longer than before, and there is no "corner" at the bottom of the triangular groove that causes stress concentration. Therefore, it becomes possible to increase the allowable value of the component force Q.

Furthermore, as can be seen in Figures 6 and 7, the filler metal 11 can be easily attached to and removed from the triangular groove 9C, so the height of the groove needs to span the entire height L of the rotor rim as in the conventional case. It is possible to increase K by the minimum required height H2. In other words, as can be seen in Fig. 5, the rotor rim without the triangular groove, which is extremely strong against the component force Q, can have a wide range of heights, and the strength of the rotor rim can be further increased.

〔Effect of the invention〕

According to the present invention, the groove into which the filler metal 11 is fitted is shallow, and
By creating triangular grooves without sharp corners where stress can be concentrated, the allowable component force Q is increased by nits, and the height H2 of the triangular grooves is kept to the minimum required to create a solid rotor rim without grooves. Since the stacking height range (L-H2) can be increased, a rotor rim with synergistically increased strength can be obtained.

This eliminates the weak points in this part of the structure of high-speed, large-capacity machines, and provides a highly reliable rotor.

[Brief explanation of drawings]

Fig. 2 is a plan view of the rotor according to the present invention, Fig. 2 is a cross-sectional view of a conventional rotor, Fig. 3 is a plan view taken along arrows - - - in Fig. 2, and Fig. 4 is a plan view of the rotor according to the present invention. A sectional view of the embodiment, FIG. 5 is a plan view taken along arrows ■-■ in FIG. 4, and FIG.
FIG. 6 is a three-dimensional view of a single filler according to the present invention, and FIG. 7 is a three-dimensional view of a triangular groove according to the present invention. l... Rotating shaft, 2... Spider, 3... Conventional rotor rim, 4... Magnetic pole, 5... Coil, 6...
・Coil support, 7... Bolt, 8... Conventional filler metal,
9A... Dovetail for magnetic pole, 9B... Auxiliary dovetail, 10... O-terminal rim of the present invention, 11...
Filling metal of the present invention, 9c...triangular front, P...centrifugal force of magnetic pole, Q...component force of P, 几...component force of coil centrifugal force, f...coil support Centrifugal force, M and N...Support point of filler metal.

Claims (1)

[Claims] 1. A plurality of magnetic pole dovetails are provided on the outer periphery of the rotor rim, magnetic poles are attached to the magnetic pole dovetails, a coil support is provided between the magnetic poles, and this coil support is attached to the fillet via bolts. In the rotor to be fixed, the groove for embedding the filler metal has a flat bottom surface, has a length up to near the magnetic pole dovetail, and has a minimum length near the coil support within the total height of the rotor rim. As a triangular groove with a limited height,
The filler metal has a shape that fits uniformly into the triangular groove, and its both ends are inserted so as to hook on the inner peripheral surfaces of the magnetic poles on both sides, so that the centrifugal force of the filler metal is transferred to the coil support and to the inner peripheral surfaces of the magnetic poles on both sides. A rotor for a rotating electrical machine, characterized in that it is supported on its inner peripheral surface.