JPS63217941A - Rotor for rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent the slots of a sector-shaped rotor core from being deformed by forming holes across both the core in a radial seam of the adjacent cores, and inserting a stopping member into the hole to prevent both the cores from radially moving. CONSTITUTION:Thin iron plates 2a, 2b formed with half slots 3a at both outer peripheral sector-shaped sides and slots 3a at the center are axially laminated to form a rotor core 2. Recesses are formed at the adjacent parts of the radial sides of the plates 2a, 2b,... to form holes 5 disposed over the adjacent cores, and stopping members 6 are inserted to the holes, respectively. Nuts are engaged with threads formed at both ends of the members 6 to clamp the plates 2a, 2b,... for forming the core, and an insulator is provided where the members 6 is in contact with the core. Thus, it can prevent the slots from being deformed to eliminate an undesired force to the winding in the slot. This is adapted for a rotary electric machine of large capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotor for a rotating electrical machine, and particularly to a rotor for a large-capacity rotating electrical machine in which a rotor coil is mounted on a rotor core.

[Conventional technology]

Generally, a rotor of a large-capacity rotating electric machine is constructed by fixing a rotor core having a plurality of slots on its outer periphery to a rotating shaft or the like using a tail, and installing a rotor coil in the slot.

As this kind of rotor, Utility Model Application Publication No. 255 in 1930
The induction motor rotor described in Publication No. 5 is known,
This is shown in FIG. The rotor core 2 has a slot 3 on its outer circumferential side.

A tail 4 is provided on the inside thereof, and the rotary shaft 1 is attached to the rotating shaft 1 by this tail 4. The rotor core 2 is constructed by laminating thin iron plates in the axial direction of the rotary shaft 1, and is fixed together with bolts or the like inserted through holes 12 formed in each part thereof. Each rotor core 2 is formed with two slots 3, one in the center and half slots on both sides forming one slot with the half slots of adjacent rotor cores.

When a rotor with such a configuration is applied to a water turbine generator that operates continuously at higher speeds and larger capacity, the slot size becomes larger and the core back height is increased to ensure the magnetic effect. It is necessary to increase the size, and specifically, the structure is as shown in FIG. In other words, the rotor core 2 has a predetermined core back height H2 with respect to the slot height H5.

When the rotor core 2, which has become relatively large in the radial direction, is fixed to the rotating shaft 1 etc. by the tail 4, it is difficult to ensure the manufacturing accuracy of the rotor core and the assembly for mounting the rotor core.
A gap G is naturally required between circumferentially adjacent rotor cores. This gap G has a larger value as one rotor becomes larger and the axial thickness of the rotor core 2 becomes thicker.

[Problem that the invention seeks to solve]

Since the rotor of a conventional rotating electric machine has the above-mentioned configuration, the rotor core 2, centering on the tail 4, may behave in proportion to the gap G due to the influence of the starting and stopping torque of the first rotor. This will be explained with reference to FIG. The above-mentioned behavior amount is determined by the slot 3a on the outermost periphery of the rotor core 2.
The portions 3b and 3b are the largest, and are indicated by the displacement amount δ. This tangential displacement amount δ does not seem to affect the rotor coil 7 itself installed in the slot, since each rotor core 2a, 2b moves in the same way.

However, the slot 3a located in the center of the rotor cores 2a and 2b maintains its original slot shape when displaced.
However, the slot 3b located between the adjacent rotor cores 2a and 2b behaves in a complicated manner and the slot shape changes. This will be explained with reference to FIG. 12, which is a detailed view of portion C. As shown in FIG. 1, the above-mentioned behavior occurs in the adjacent rotor core 2a.

2b are moved in opposite directions in the radial direction, and the slot shape changes as shown by the two-dot chain line. That is, moving forces Fa and Fb act on rotor cores 2a and 2b, respectively, and rotor coil 7, wedge 13, and interlayer insulation piece 1
4 is subjected to a shear load close to radial torsion. For this reason, for example, an excessive concentrated force is generated at the contact surface d of the rotor coil 7.

Furthermore, when centrifugal force is added in this state of uneven contact,
There were problems such as the insulation of the rotor coil 7 being destroyed.

An object of the present invention is to provide a rotor for a rotating electrical machine that can increase speed and capacity by suppressing the above-mentioned harmful movement of the rotor core.

[Means for solving problems]

In order to achieve this object, the present invention forms a hole spanning both rotor cores at the joint portion of one rotor core adjacent in the circumferential direction, and a blocking member for preventing relative movement of the two rotor cores in the radial direction in this hole. It is characterized by being equipped with.

[Effect]

Since the rotor of the rotating electrical machine of the present invention is configured as described above,
Radial movement of the rotor cores that would change the shape of the slots formed between adjacent rotor cores can be prevented by the blocking member, thereby preventing undesired forces from being applied to structures within the slots. By preventing this, you can achieve higher speed and larger capacity.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a longitudinal cross-sectional view of the rotor. A spider 15 consisting of an arm 15a and a rim 15b is attached to the rotating shaft 1, and the tail 4 of the rotor core 2 is fixed to the rim 15b of the spider 15. This rotor core 2 is made by laminating a plurality of thin iron plates to a thickness of dimension Lf in the axial direction of the rotating shaft l,
It is fixed by a tightening port 6, and a rotor coil 7 having a winding shape is wound around a slot portion on the outer peripheral side of the rotor core 2.

Further, details of the rotor core 2 will be explained with reference to FIG. 1, which is a sectional view taken along line I-1 in FIG. 2.

As can be seen from FIG. 1, the rotor core 2 is.

one slot 3a at the circumferential center of the outer periphery and two slots 3b each forming one slot 3b in the adjacent rotor core;
It has a tail 4 formed on the center side and fixed to the rim 15b. A rectangular hole 5, for example, is formed at the joint between adjacent rotor cores 2a, 2b, spanning both rotor cores 2a, 2b, and a blocking member 6 is installed in this hole 5.

As shown in FIG. 3, this blocking member 6 is configured as a tightening bolt having a square column 6a at the center and threaded portions 6b at both ends. Therefore.

This blocking member 6 fixes thin iron plates laminated in the axial direction of the rotating shaft 1 as shown in FIG. 2, and also fixes both rotor cores as shown in FIG. Relative movement of 2a and 2b in the radial direction is prevented. In other words, the tightening bolt configured as the blocking member 6 has a square column portion 6a whose radial direction matches 1% of the shape of the hole 5 formed across the adjacent rotor cores 2a and 2b.
Therefore, even if a force Fa-Fb acts on the adjacent rotor cores 2a and 2b at the time of starting or stopping, which causes a relative movement in the radial direction as shown by the arrow in FIG. The rotor core 2a is received by the blocking member 6.

Prevent movement of 2b.

In this way, relative movement of the adjacent rotor cores 2a, 2b in the radial direction is prevented, so that the adjacent rotor cores 2a, 2b are prevented from moving relative to each other in the radial direction.
There is no deformation of the shape of the slot 3b formed between a and 2b, and no undesired force is applied to the rotor coil 7, wedge, interlayer insulation piece, etc. inside the slot 3b. Moreover, in this case, since the blocking member 6 also serves as a tightening bolt, the number of components is small.

FIG. 5 shows a rotor according to a different embodiment. Generally the rotor cores 2a, 2b near the slots 3a, 3b
It is known that metal members passing through the magnetic flux heat up due to the influence of magnetic flux. Therefore, if the blocking member 6 is made of metal as in the embodiment shown in FIG.

Since the blocking member 6 heats up, it is necessary to provide it away from the thrower 3b. On the other hand, in the rotor shown in FIG. 5, the blocking member 6 is moved as close as possible to the thrower) 3b,
This increases the deterrent effect.

In other words, the hole 5 that is formed across the adjacent rotor cores 2a and 2b is formed at a position with a large distance from the inside of the rotor core, and the tightening port and blocking member 6 that is inserted into this hole 5 is , an insulator 8 is provided on the outer periphery of the intermediate portion corresponding to the rotor core, and threaded portions 6b are provided at both ends of the insulator 8.

According to this embodiment, heating of the blocking member 6 can be prevented, and deformation of the thrower 3b can be more effectively prevented.

Although the shape of the hole 5 and the shape of the blocking member 6 are circular in cross section, the same effect can be obtained even if other shapes are used.

7 and 8 illustrate different embodiments of the invention. A hole 5 is formed at a circumferential joint between adjacent rotor cores 2a and 2b, spanning both.

The insertion of the blocking member 6 into the hole 5 is similar to the previous embodiment. However, instead of constructing the blocking member 6 alone, an insertion assisting member 11 having a C-shaped cross section and elastically deformable as shown in FIG. 8 is first inserted into the hole 5.

Even if there are irregularities in the six holes 5 of the thin iron plates stacked in the axial direction of the rotating shaft l due to manufacturing precision or assembly precision, the insertion is assisted by the elastic deformation of the insertion assisting member 11, and then the insertion assisting member 11 Insert the core metal 14 into the air space of
The core metal 14 prevents elastic deformation of the insertion assisting member 110 and also prevents relative movement of adjacent rotor cores 2a and 2b in the radial direction.

In each of the above embodiments, each rotor core has one slot (3a) between the half slots at both ends of its outer periphery, but it may have two or more slots between the half slots on both sides. good.

In addition, although the blocking members 6 and their holes 5 for blocking the relative movement of adjacent rotor cores in the radial direction are formed on the circumference of the same diameter from the center of the one-rotation shaft 1, they are not limited to the same circumference. do not have. Furthermore, the tightening bolts that constitute the rotor core by fixing the blocking member 6 and the thin iron plates laminated in the axial direction of one rotational shaft may be constructed separately as dedicated bolts, or may be constructed as a combination of dedicated bolts and dual-purpose bolts. You may do so.

〔Effect of the invention〕

As explained above, the present invention forms a hole spanning one rotor core at the circumferential joint of adjacent rotor cores,
The blocking member installed in this hole prevents the relative movement of both rotor cores in the radial direction, thereby preventing deformation of the slot formed by both rotor cores and preventing undesired force from being applied to the structure inside the slot. It is possible to easily manufacture rotors for high-speed, large-capacity rotating electric machines that have large starting and stopping torques.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view of a main part of a rotor of a rotating electric machine according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional side view of a rotor of the same rotating electric machine, and FIG. 4 is an enlarged view of the main part of FIG. 1, FIG. 5 is a cross-sectional plan view of the main part of a rotor of a rotating electrical machine according to a different embodiment of the present invention, and FIG.
FIG. 7 is a cross-sectional plan view of a main part of a rotor of a rotary electric machine according to still another embodiment of the present invention; FIG. 8 is a perspective view of the blocking member shown in FIG. 7; FIG. FIG. 10 is a cross-sectional plan view of essential parts of a rotor of a conventional rotating electric machine. FIG. 11 is a plan view showing the behavior of the rotor core, and FIG. 12 is an enlarged view of section C in FIG. 11. 1...Rotating shaft-2a, 2b...Rotor core, 3a, 3b...Slot, 4...
・Tail, 5... hole. 6... Blocking member, 8... Insulator, 11
...Insertion auxiliary member, ]4 ... Core bar, 1
5b...Rim. l! 1 Figure 2.2a, 2b Rotor core 3a, 3b - Slot 4 - Tail 5 - Hole 6 - - Blocking member 7 Roke coil Figure 2 Figure 3 Figure 1m5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 1O Figure

Claims (1)

[Claims] 1. A rotor core is formed by laminating thin iron plates having half slots on both sides of the outer periphery in the axial direction of the rotating shaft, and a plurality of rotor cores are provided in the circumferential direction of the rotating shaft and adjacent to each other. In the rotor of the rotating electric machine, in which one slot is formed by the half slots, the rotor cores are arranged at a joint portion of the rotor cores that are adjacent to each other in the circumferential direction in the axial direction of the rotating shaft. A rotor for a rotating electrical machine, characterized in that a continuous hole is formed in the hole, and a blocking member for preventing relative movement of the rotating shaft in the adjacent rotor core in the radial direction is installed in the hole. 2. The rotor of a rotating electric machine according to claim 1, wherein the blocking member is a tightening bolt that tightens thin iron plates laminated in the axial direction of the rotating shaft. 3. The rotor of a rotating electric machine according to claim 1, wherein the blocking member has a portion in contact with the rotor core within the hole made of an insulating material. 4. In the item described in claim 1 above, the blocking member includes an insertion assisting member having a C-shaped cross section with a portion cut out to provide elasticity, and a core metal inserted into the insertion assisting member. A rotor for a rotating electrical machine characterized by comprising: