JPS5928132B2 - 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 blocking member between field poles thereof.

Recently, in a salient pole rotor, a structure has been adopted in which adjacent field poles are sealed off with a blocking member and the rotor is formed into a cylindrical shape to reduce windage loss.

An example of such a salient pole rotor is shown in FIG.

In this figure, 1 is a yoke fixed to a shaft (not shown), and a plurality of field poles consisting of a laminated field core 2 and a field coil 3 are attached to the outer periphery of the yoke by fastening parts 4 such as dovetails. There is.

A groove 5 extending in the axial direction is formed on the side surface of the head of the field core 2, and by inserting both ends of the closing plate 6 into the groove 5, the valley between adjacent field poles is sealed. Therefore, the rotor is apparently formed into a cylindrical shape.

By the way, as shown in FIG. 2, this blocking plate 6 may be tilted due to some conditions, or due to thermal deformation due to non-uniform eddy current, etc., in the groove 5 of the field core 2. The state is such that the entire centrifugal force applied to the closing plate 6 is supported by the local contact point a,
An excessive load is applied only to the thin plate of the field core 2 at this contact point a.

Therefore, as shown in FIGS. 3 and 4, rod-shaped members 7 made of stainless steel or the like are used as the closing members instead of the conventional closing plates, and these are arranged approximately at right angles to the axial direction, and both ends thereof are The inventors of the present invention have recently proposed a device in which the part is inserted into the groove 5 and fixed with an adhesive 8.

According to this, the centrifugal force applied to each rod-shaped member 7 is smaller than that of a plate-shaped member, and the contact with the grooves 5 of the field core 2 is at a pitch equal to the thickness of the rod-shaped member 7, so that the whole When viewed as follows, it can be considered that the load distribution is approximately uniform.

However, model experiments have revealed that the use of such rod-shaped members has the following problems.

In other words, as the rotor rotates, the field poles protrude outward in the radial direction, the circumferential distance between the two heads of the field cores of adjacent field poles becomes narrow, and considerable vibration occurs between them. As a result, the adhesive 8 between the rod-shaped member 7 and the field core 2 may crack or peel off, losing the adhesive effect, and in the worst case, fragments of the adhesive 8 may scatter and damage the stator coil. damage.

Furthermore, since the closing member is made up of a large number of different rod-shaped members 7, there is also the problem that work efficiency is poor during assembly work.

It is an object of the present invention to provide a rotating salient pole capable of solving the above-mentioned problems, stably supporting a closing member made of a rod-shaped member in a groove of a field core, and improving workability of assembling the closing member. It is to provide a child.

In order to achieve this object, the present invention connects both ends of a plurality of rod-like members constituting a closure member with a connecting member made of a material having a larger coefficient of thermal expansion than the rod-like members, and connects the connecting members. It is characterized in that it is inserted into a groove on the side surface of the field core head through the field core.

An embodiment of the present invention will be described below with reference to FIGS. 5 to 8.

As shown in FIGS. 5 and 6, the rod-shaped closure member 7 is connected at both ends by a plurality of connecting members 9 made of a material having a higher coefficient of thermal expansion than the material of the rod-shaped closure member 7, such as fiber reinforced plastic. As shown in FIG. It will be done.

In this assembled state, the rod-shaped blocking member 7 and the connecting member 9 are almost integrated with their joining surfaces in close contact, and the fitting surface C between the connecting member 9 and the groove 5 of the field core 2 is loose. It is in a state.

Therefore, in this state, each rod-shaped blocking member 7
are individually displaced in the direction of arrow X, that is, in the longitudinal direction, and high stress is generated in the connecting member 9 due to vibration of the field pole and expansion and contraction due to local thermal deformation, causing cracks and scattering. There is a risk of

However, in this embodiment, since a material with a larger coefficient of thermal expansion than the rod-shaped blocking member 7 is used as the material for the connecting member 9, if the temperature of the field pole increases to 80°C to 100°C with the operation of the synchronous machine. , the attachment portions at both ends of the rod-shaped blocking member 7 are in a state as shown in FIG.

That is, due to the large thermal expansion of the connecting member 9, the joint surface C between the rod-shaped blocking member 7 and the connecting member 9 becomes a loose fit, while the fitting surface C between the connecting member 9 and the groove 5 of the field core 2 becomes a loose fit. shows a tendency to stick together.

Therefore, each bar-shaped blocking member 7 can be displaced independently in the X direction, and no force is transmitted to the connecting member 9, so high stress is generated in the connecting member 9, causing it to crack or scatter. The danger can be eliminated.

In addition, in the above embodiment, a solid cylindrical one is used as the bar-shaped closing member, but other materials such as a prismatic one,
It goes without saying that various types, such as hollow ones, can be selected and used as desired.

As explained above, according to the present invention, it is possible to stably support a bar-shaped blocking member in the groove of a field core, improve its reliability, and combine a plurality of bar-shaped blocking members into one component. Therefore, the assembly work can be improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of essential parts showing an example of a conventional salient pole rotor, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a salient pole rotor according to an existing proposal. FIG. 4 is a longitudinal sectional side view of the main part showing the mounting portion of the capping member, FIG. 5 is a cross-sectional view showing an example of the capping member used in a salient pole rotor according to an embodiment of the present invention. Figure 6 is a front view of the same part, Figure 7
8 and 8 are vertical sectional front views of essential parts of the salient pole rotor according to an embodiment of the present invention, showing various states of the blocking member attachment portion at room temperature and during operation. 1...Yoke, 2...Field core, 3.
...Field coil, 5...Groove, 7...
... Rod-shaped blocking member, 9... Connection member.

Claims (1)

[Claims] 1. A shaft, a yoke fixed to this shaft,
A plurality of field poles consisting of a field core and a field coil are attached to the outer circumference of this yoke, and both ends of the field core are inserted into grooves formed on the side surfaces of the field core heads of adjacent field poles. and a closure member, wherein the closure member is composed of a plurality of rod-shaped members arranged substantially perpendicular to the axial direction, and both ends of the plurality of rod-shaped members are formed of a material having a coefficient of thermal expansion larger than that of the rod-shaped members. A salient pole rotor, characterized in that the rotor is connected to each other by a connecting member made of a material and inserted into the groove via the connecting member.