JPS6241554Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a rotor of a salient pole type rotating electric machine, in particular, a part of the pole is fitted and fixed in a groove formed in a rotating shaft body which becomes a rotor. This invention relates to a rotor of a salient pole rotating electrical machine whose poles are supported by a rotating shaft.

Conventionally, this type of rotor is shown in attached drawing No. 1.
I found something like the one shown in the picture. That is, in the figure, 1 is the pole, 2 is the tail of pole 1, and 3 is the pole 1.
4 is a groove formed in the rotating shaft body 3 into which the tail 2 is fitted; 5 is a groove formed by driving into the gap between the tail 2 and the groove 4; 4, that is, a key to securely fix the rotating shaft main body 3 and the tail 2, that is, the pole 1; 6, the corner of the tail 2; and 7, the corner of the groove 4; Since high stress is generated in these areas, it is necessary to design the groove shape, pole shape, etc. while paying attention to these stress concentration areas.

In such a device for supporting and fixing pole 1 in a rotor, the key 5 and It is desirable that each contact surface with the groove 4 and the tail 2 be in uniform contact so that the surface pressure is uniform. However, positioning errors may occur on these contact surfaces depending on machining errors and working conditions when driving the key, and as a result of this, the surface pressure on these contact surfaces is not uniformly distributed. For example, As shown in FIG. 2 of the accompanying drawings, there were cases where the distribution was higher on either side. In the figure, the rising portions of the curve at both ends are due to the influence of stress concentration at the ends of the key 5. Here, if the side where the surface pressure distribution is high is close to the tail 2 or the corner parts 6 and 7 of the groove 4, these parts will be affected by stress concentration at the end of the key 5, so the stress will also be high. . Conversely, there are cases where the surface pressure distribution becomes high in areas far from the corners, but this is because the moment acting on the gap corners 6 and 7 becomes large, and in this case, the stress is also high. Become. Furthermore, the state of contact has become more extreme,
If there is a case where there is a line contact at either end of the surfaces that are designed to come into contact, or a case where the key 5 hardly plays its role on one of the left and right contact surfaces, the corner portion 6 , 7 becomes even larger. In particular, in the latter case, the contact between the key, the groove wall, and the tail becomes poor, which interrupts the magnetic field between the poles and the rotor body, resulting in a decrease in electrical performance. The rotor was hot.

The present invention eliminates the above-mentioned drawbacks of the conventional rotor, especially its pole support and fixing device, and eliminates the problem of contact even when machining errors on the contact surface or misalignment when driving the key occur. The purpose is to provide a rotor for a salient pole type rotating electric machine which can be securely fixed to prevent electrical loss and can keep stress at corners of grooves and tails low. It is something.

In order to achieve this objective, the present invention is characterized in that a protrusion is provided at one location on one of the contact surfaces where the pole and the groove come into contact either directly or indirectly. It is something.

Hereinafter, before explaining the present invention, the principle of the present invention will be explained.

When an external force such as a centrifugal force is applied to the tail, the value of the stress generated at the corner changes as shown in FIG. 3, depending on the contact position when the tail and key are in line contact. In other words, the closer the contact position is to the corner, the higher the stress at the corner will be due to the influence of the high stress at the contact position, but as the contact position moves away from the corner, this effect gradually decreases. As it disappears, the moment determined by the product of the distance from the corner and the contact force increases, so by balancing both effects, the contact position where the stress at the corner takes the minimum value is determined. exist. Therefore, by ensuring contact at such a position, it is possible to keep the stress at the corner of the tail low. The stress at the corner in this case is
This contact position can be said to be the optimal contact position from a stress point of view because it is lower than when uniform contact occurs over the entire surface set as the designed contact surface. In addition, by cutting off the side opposite to the corner from this optimal position,
When machining is performed so that the contact position is at the extreme end, the stress value at this time generally increases compared to before machining, which does not lead to a desirable result.

Note that the above principle holds true for the groove wall side as well.

Hereinafter, the present invention will be explained based on FIG. 4 of the accompanying drawings showing one embodiment thereof.

In the figure, 1 is a pole, 3 is a rotating shaft body, and 4 is a pole.
5 is a groove, 5 is a key, 6 is a corner of the tail, and 7 is a corner of the groove, which are the same as those in FIG. 1 showing a conventional rotor. Also, code 1
1 is a protrusion provided on the key 5 side of the tail 12 according to the present invention, and is formed by processing the tail 12 side at the contact surface between the tail 12 and the key 5.

By using the tail 12 provided with the protrusion 11 in this way, even if the machining accuracy of the contact surface is low, or even if some positional deviation occurs during key entry, the tail 12 will make contact with the key at approximately the same position. Therefore, it is possible to set the contact position to a position where the stress at the corner portion 6 of the tail is minimized. Furthermore, even if the protrusion 11 is slightly crushed when the key 5 is pressed, the contact will be concentrated around the position of the protrusion 11.
The effect of this invention is not lost. Furthermore, since the contact state between the tail 12 and the key is close to line contact, the tail 1
Sufficient contact surface pressure can be ensured at both the left and right contact portions of the pole 2 when the key is driven in, and the contact is ensured, so that the magnetic field between the pole 1 and the rotating shaft body is not interrupted.

Although the above embodiment shows an example in which the protrusion 11 is formed on a part of the tail 12, the present invention is not limited to this, and as shown in FIG. 5 of the attached drawings, the entire contact surface of the conventional tail 21 is The protruding portion 22 may be formed by processing it into a large arc shape, and in this case as well, it can play the same role as the above embodiment.

Alternatively, as shown in FIG. 6 of the accompanying drawings, a separate protruding member 31 forming a protruding portion may be manufactured and attached to a predetermined contact surface of the tail 2 by means such as brazing. It is also possible to achieve the same effect as above.

Although the above example shows an example in which a protrusion is provided on the tail side, the invention is not limited to this, and as shown in FIG. 7 of the attached drawings, a similar protrusion 42 may be provided on the key 41 side. can be reached.

Further, in the above embodiment and its application side, an example was shown in which a protrusion was provided at the contact portion between the tail and the key, but a similar protrusion may be provided at the contact portion between the groove wall and the key. The effect is no different.

However, if either the tail and the key or the groove wall and the key are in line contact, the other surfaces will be in almost uniform surface contact, and the surface pressure distribution will not be biased as shown in Figure 2, so both There is no particular need for collinear contact.

Although the above embodiments have been shown on the premise that a key is interposed on the contact surface, it is also possible to apply the present invention to a structure in which the tail and the wall surface are in direct contact. Furthermore, the shapes of the tails and grooves in the present invention are not limited to those shown in the embodiments, but can be applied to any shape.

As described above, in the present invention, by providing a protrusion at one location on at least one surface where the tail, key, and groove wall contact each other, the stress at the corner related to the contact position is minimized. Since it has become possible to set the rotor in such a position, it has excellent strength, and since it has become possible to obtain reliable contact, it is possible to provide a rotor for a salient pole type rotating electrical machine with less electrical loss. We were able to achieve this effect.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a typical pole support device on the rotor shaft of a salient pole type rotating electric machine, Figure 2 is an actual surface pressure distribution diagram at the contact surface between the key and the tail or groove wall, and Figure 3 is Fig. 4 is a cross-sectional view of an embodiment in which the present invention is applied to the contact portion between the key and the tail; Fig. 5-
FIG. 7 is a sectional view of a main part of another embodiment of the present invention. 1...Pole, 2,12,21...Tail, 3...
Rotating shaft body, 4... Groove, 5, 41... Key, 6...
... Corner part (corner part of the tail), 7... Corner part (corner part of the groove), 11, 22, 42... Protrusion part, 31
...Protruding member. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] Fixing the poles to the rotating shaft body of a salient pole type rotating electrical machine is
In a rotor configured to prevent the poles from separating due to centrifugal force by fitting part of the poles into grooves provided in the rotating shaft body, the poles and grooves are connected directly and indirectly to each other. A rotor for a salient pole rotating electrical machine, characterized in that a protrusion is provided at one location on one of the contact surfaces that come into contact with each other.