JPS5943897B2 - salient pole rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a salient pole rotor such as a synchronous machine, and particularly to a coupling structure between a yoke and a pole core thereof.

The pole core of the salient pole rotor is a thin plate (1 to 2 punched
It is constructed by placing pole end plates made of thick plates on both end faces of a laminated thin plate part made of laminated steel plates (11 LIn thick iron plates), and tightening these together with multiple bolts, and it is constructed by attaching an engaging protrusion such as a dovetail or T-tail. It is connected to the engagement groove of the yoke at the yoke.

When the salient pole rotor rotates, centrifugal force is applied to the pole consisting of a pole core and a field coil wound around the pole core, but this centrifugal force is absorbed by the engaging portions such as the dovetails.

Recently, there has been a demand for salient pole type synchronous machines with large capacity and high speed rotation. , the laminated thickness of the thin plates is also thick (Natsumata came.

However, in view of manufacturing costs, it is desired that the thickness of the thin plate be 1 to 2 mm, which is within the range that can be punched using existing presses, as in the past.

Therefore, out-of-plane deformation, ie, buckling, in engaging portions such as dovetails, which had not been a problem in the past, has become a problem.

In other words, due to the increase in the laminated thickness of the thin plates, the thin plates at the engagement protrusion can be elastically seated with low stress, a stress that was previously considered to be sufficiently safe, even against small external forces (centrifugal force). It was found that there was a risk of bending, deformation and collapse.

Furthermore, it has been confirmed through experiments and theory that the occurrence of this elastic buckling is influenced by the initial tightening surface pressure of the engagement protrusion and the spring constant of the constraint in the stacking direction, that is, the stiffness.

For example, in an extreme case, if the resiliency constant (rigidity) in the lamination direction is infinite and no deformation is allowed, there is no room for out-of-plane deformation of the thin plate lamination, and buckling will not occur. will be easily understood.

Therefore, in order to prevent buckling of the engagement protrusion of the pole core, it is necessary to make the resiliency constant (negative property) of the restraint in the stacking direction as large as possible, and to increase the initial tightening surface pressure as much as possible (
It is important to strengthen integration by

By the way, in the conventional pole core, the initial tightening surface pressure is currently increased by the rigidity of the bolt via the pole end grates on both end faces and the insertion of a liner between the thin plates at the engagement protrusion.

It is also known that a through bolt is inserted into the approximate center of the engaging protrusion and tightened, but this is rarely used at present because it reduces the cross-sectional area of the engaging protrusion and has an adverse effect on strength. do not have.

The spring constant (rigidity) α□ of the bolt is α,=AE/L Here, A: cross-sectional area of bolt E: Young's modulus of bolt material L: Bolt length Hail to you.

As mentioned above, recently, the number of laminated thin plates is large (and the length of the bolt reaches 2 to 3 m, so the spring constant α8
As can be seen from the above equation, becomes small.

Therefore, in the conventional structure using bolt tightening as described above, out-of-plane deformation due to centrifugal force cannot be suppressed, and buckling is likely to occur.

The present invention was made in view of these points, and its purpose is to prevent out-of-plane deformation in the engagement protrusion of the pole core,
The purpose of the present invention is to provide a highly reliable salient pole rotor.

In order to achieve this object, the present invention provides a tapered surface on the end surface of the engagement protrusion of the pole end plate, and fastens a restraining member having a tapered surface in contact with the tapered surface to the yoke with bolts, The restraining member restrains the engagement protrusion of the pole core from elongating in the lamination direction of the thin plates, and the restraining force is increased by the action of centrifugal force.

Hereinafter, the present invention will be explained in detail based on the drawings.

1 and 2 show an embodiment of the present invention,
1 is a yoke fixed to a shaft (not shown); 2 is a pole core composed of a laminated thin plate part 3 and pole end plates 4 made of thick plates arranged at both ends thereof;
A field coil (not shown) is wound around this pole core 2.

The yoke 1 has a T-shaped groove 5, and the pole core 2 has a T-tail 6.
are formed respectively, and the T-tail 6 is connected to the T-shaped groove 5.
The pole core 2 is coupled to the yoke 1 by engaging with the yoke 1 and driving the stud 7 between them.

The above structure is the same as the conventional one, but in this embodiment, a presser metal fitting 8 is further fixed to the yoke 1 with a mounting bolt 9, and comes into contact with the end surface of the tail portion of the pole end plate 40T.

Note that these two joint surfaces io and ii are inclined in a direction that restrains the pole from displacing in the outer circumferential direction due to centrifugal force F, that is, in a direction in which the outer side faces toward the axial center of the trochanter. It is formed on a tapered surface.

Therefore, displacement of the T-tail 6 of the pole core 2 in the stacking direction is not only prevented by the restraining force of the presser metal fitting 8, but also when the pole is displaced in the outer circumferential direction as the rotation speed increases, Due to the action of the chees 410 and 11, a restraining force stronger than when the T-tail 6 is at rest is exerted (therefore, the breaking strength due to out-of-plane deformation of the laminated thin plate portion 3 can be significantly increased).

Further, FIGS. 3 and 4 show other embodiments of the present invention.

In this embodiment, the presser metal fitting 8 is attached to the pole end grate 4.
is fixed to the yoke 1 by mounting bolts 9 with an interval between them, and a tightening piece 12 is inserted between them.
It is attached to the yoke 1 with tightening bolts 13.

Note that the presser metal fitting 8 is formed with a tapered surface 14 that is inclined toward the opposite side to the tapered surface 10 of the pole end plate 4.
On both sides of the clamping piece 12, similar tapered surfaces 15, 16 are formed which contact the two tapered surfaces 10 and 14.

Therefore, according to this embodiment, in addition to obtaining the same effect as the previous embodiment, by tightening the tightening piece 12 to the yoke 1 side with the tightening bolt 13, the T-tail 6 of the pole core 2 is compressed in the stacking direction. Since force can be applied, a restraining force against out-of-plane deformation of the laminated thin plate portion 3 can be applied from the initial assembly.

However, in this embodiment, there are some problems in terms of space when actually assembling work, and the number of parts is large (
Become.

FIGS. 5 and 6 show embodiments in which this point has been improved.

The presser metal fitting 8 is formed with a leg portion 11 that projects downward, and the yoke 1 is formed with a groove portion 18 into which the leg portion 17 fits.

Therefore, when the presser metal fitting 8 is tightened to the yoke 1 side with the tightening bolt 13, the out-of-plane deformation of the thin plate laminated portion is caused by the action of both tapered surfaces 10°11, similar to the embodiments shown in FIGS. 3 and 4. A restraining force can be applied from the initial assembly.

Moreover, its structure is simple and practical.

Furthermore, since the displacement in the stacking direction is received by the legs 17 fitted in the grooves 18 of the yoke 1, it is possible to withstand a strong displacement force compared to the case where the displacement is received by the mounting bolts as in the above embodiment. can.

In each of the embodiments described above, a restraining means such as a presser fitting for preventing out-of-plane deformation of the pole core is separately provided for each pole.

However, providing each restraining means separately in this way does not necessarily result in a structure with sufficient strength because the mounting space for the presser fittings and the like is limited.

FIGS. 1 to 9 and FIGS. 10 and 11 show other embodiments of the present invention that improve this point, respectively.

In the embodiments shown in FIGS. 7 to 9, the presser metal fitting 8 includes a plurality of axial protrusions 19 having tapered surfaces 11 corresponding to each pole core 20T tail 6, and a common axial protrusion 19 that connects each of these protrusions 19. The ring part 20 and the common ring part 2
0, a plurality of tightening bolts 13 are attached to the end surface of the yoke 1.
It is installed by

In the figure, 21 is a field coil. Therefore, the restraining means can be applied to all the poles at the same time by a simple assembly operation, and there is no space restriction, so that it can be used as the tightening bolt 13 to suppress displacement in the stacking direction.
A diameter having sufficient strength can also be used.

Moreover, FIGS. 10 and 11 show modified examples of FIGS. 7 to 9, and on the inner circumferential side of the common ring portion 20 of the presser metal fitting 8,
A ring-shaped protrusion 22 is formed that protrudes toward the end surface of the yoke 1, and a radially intermediate portion of the common ring portion 20 is formed on the yoke 1.
It is also necessary to avoid contact with the end surface of the

Therefore, by tightening the tightening bolt 13, the presser metal fitting 8 uses the ring-shaped protrusion 22 as a fulcrum, and each of the protrusions 1
9, a large tightening force can be applied to the T-tail 6 of each pole core.

As explained above, according to the present invention, the end surface of the engagement protrusion of the pole end plate is provided with a tapered surface, and
A restraining member having a tapered surface in contact with this tapered surface is fastened and fixed to the yoke with bolts, so that the restraining member restrains the engagement protrusion of the pole core from elongating in the lamination direction of the thin plates, and furthermore, when rotating, the tapered surface This restraining force can be increased using centrifugal force applied to the pole.

Therefore, it is possible to prevent out-of-plane deformation in the engagement protrusion of the pole core, and to obtain a salient pole rotor with high reliability in terms of strength.

[Brief explanation of the drawing]

FIG. 1 is a front view of a pole joint portion of a salient pole rotor showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line 8-A in FIG.
3 and 4, FIGS. 5 and 6, FIGS. 7 to 9, and FIGS. 10 and 11 respectively show other embodiments of the present invention. The figure is a front view of the pole connection part, Figure 4 is a sectional view taken along the line B-B in Figure 3,
Figure 5 is a front view of the pole connection part, Figure 6 is C of Figure 5.
-C line sectional view, Figure 1 is a schematic front view of the salient pole rotor, Figure 8 is a front view of the pole connecting part, Figure 9 is the line D-- of Figure 8.
D line sectional view, Figure 10 is a front view of the pole connection part, Figure 1
FIG. 1 is a sectional view taken along the line E--E in FIG. 10. 1...Yoke, 2...Pole core, 3
...Thin plate lamination section, 4...Pole end plate, 5...T-shaped groove, 6...T tail, 8...Presser foot Metal fittings, 10°11.14,1
5.16... Tapered surface, 12... Tightening piece, 19... Axial protrusion, 20...
...Common ring part, 22...Ring-shaped protrusion.

Claims (1)

[Claims] 1. A pole core consisting of a shaft, a yoke, a laminated thin plate portion, and pole end plates arranged at both ends thereof, and a field coil wound around the pole core,
In the structure in which the groove provided on the yoke and the protrusion provided on the pole core are engaged with each other, the outer side is on the axial center side of the rotor on the end surface of the engagement protrusion of the pole end grate. 1. A salient pole rotor, characterized in that a restraining member having a tapered surface that is inclined toward the yoke and that is in contact with the tapered surface of the bracket is fastened and fixed to the yoke by a bolt. 2. In claim 1, the restraining member comprises:
A salient pole rotor, which extends to the end face of the yoke and is fixed to the end face of the yoke at this extended portion. 3. A salient pole rotor according to claim 2, wherein an extension of the restraining member fixed to the end face of the yoke is formed in a ring shape common to each pole core.