JPH066683Y2 - Stacking structure of fan-shaped cores in rotating electrical machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to improvement of a stacking structure of fan-shaped cores in a rotating electric machine.

[Prior Art] FIG. 2 is a perspective view showing the inside of a conventional synchronous generator (this is called Conventional Example 1), where 1 is a stator core K and a coil L.
Is a stator, 2 is a rotor, J is its axis, P is a magnetic pole, and M is a winding.

By the way, the stator core of the stator 1 of such a synchronous generator or an induction machine is generally constructed by laminating circular stator cores.
It is difficult to punch from a single piece of material, and it is customary to connect multiple fan-shaped core materials to form a circular core, and stack the circular cores to form a stator core.

However, if the stator core K is divided into a plurality of parts, magnetic imbalance may occur in the stator core K and an interlinking magnetic flux may be generated in the axis J. Therefore, an induced voltage is generated in the axis J and insulation failure occurs. As a result, a shaft current may flow in the shaft J, which may cause the bearing to be burnt. Therefore, the following points are taken into consideration.

That is, generally, when the number of joints is n and the number of pairs of magnetic poles P is P _d , the fraction that becomes n / P _d is reduced, and when the numerator is an odd number, a magnetic flux interlinking with the axis J is generated, and ， If the numerator is an even number, the directions of magnetic flux will be balanced.

Therefore, in the conventional stator core K, when a fan-shaped material is used, if the number of fan-shaped materials is m, the number n of joints Q is 2 × m, and the number P _d of pairs of magnetic poles P is The relationship with is expressed as m × 2 / P _d = β / α (1).

In equation (1), β / α is a standard fraction obtained by reducing (m × 2 / P _d ), and if β is an even number, the third
When fan-shaped core S is halved to form stator core K as shown in Fig. (A), no induced voltage is generated on axis J, and when β is an odd number, halved Since an induced voltage is generated on the axis J, a 1/4 stacking method in which the number of divisions is twice as many as 1/2 stacking is used for the stator core K, as shown in FIG.

However, since it is poor in workability to form the core of each block by simply stacking 1/4, the applicant has proposed that the conventional example 2 is as follows.
As shown in FIG. 4, a circular stator block 4 is formed by shifting the fan-shaped cores S by ½ each, and forming a circular stator block 4. This stator block 4 is a multiple of 4 (in the figure, 4 Times)
It has been proposed that the whole stator core is formed by connecting the stator blocks and connecting them by shifting them by 1/2 at the connecting surface between the stator blocks. A and B are the joints of the fan-shaped core plate S,
C is a ventilation duct provided between the stator blocks 4, 4 ,.

[Problems to be Solved by the Invention] In the laminated structure of the stator core of Conventional Example 1 (Fig. 3 (b)), all the fan-shaped cores of each core block are 1/4 stacked, so that the fan-shaped core When all are halved (3rd
Compared to Figure (a)), the positioning of the core stacking is more troublesome, and there is a drawback that it takes about 20% extra time.

Further, in the case of the conventional example 2 (FIG. 4), the number of blocks of the laminated cores is limited to the case of a multiple of 4.
However, in reality, depending on the design conditions such as the capacity of the rotating machine and the number of ventilation ducts required, for example, 5, 6, 7,
Even if it is necessary to configure the stator core with blocks having a number of cores other than a multiple of 4, such as 9 ...
Conventional example 2 has a drawback that it cannot be applied.

[Means for Solving the Problems] The present invention is to solve the above-described problems of the conventional example, and is a multiple of 4 circular cores that are units stacked by stacking the fan-shaped cores by shifting each other by 1/2. Form a block of
These core blocks are 1 /
The block groups E are directly connected in the axial direction so as to form four stacks, and a predetermined number of circular cores, which are formed by stacking 1/4 of fan-shaped cores on each other, are provided on one side of the block group E and The present invention relates to a stacked structure of fan-shaped cores in a rotating electric machine in which a stator core composed of a desired number of core blocks is formed as a block group F by being arranged side by side coaxially on the other side.

[Embodiment] The present invention will be specifically described below based on an embodiment shown in FIG. In the figure, the components equivalent to those in FIG. 4 are designated by the same reference numerals.

That is, in the present invention, for example, a core block 4a _{1 of} a multiple of 4 (4 in the embodiment) which is a unit in which, for example, two fan-shaped cores are shifted from each other by 1/2 and are stacked and laminated.
˜4a ₄ and these core blocks 4a _{1 to} 4a
₄ is a block group E which is directly connected in the axial direction through the ventilation ducts C _{1 to} C ₃ so that the joints are 1/4 stacked, and further, two fan-shaped cores, for example, two each are mutually connected. Circular cores 5a ₁ and 5a ₂ formed by stacking 1/4 are arranged in parallel on one side and the other side of the block group E, respectively, through ventilation ducts C ₄ and C ₅ so as to be coaxial with each other. The stator core is configured as F.

In addition, 6 is a core presser.

In the above-described embodiment, the case where the fan-shaped cores are shifted by two and stacked in 1/2 or 1/4 is explained. However, basically, the fan-shaped cores may be stacked one by one and the workability is improved. , 2 sheets each as in the embodiment, or 3 instead of this
It is more desirable to perform the shift stacking with an appropriate number such as stacking sheets.

Further, although the embodiment has been described in the case where the number of core blocks is 6, the present invention can be applied to all numbers other than a multiple of 4, for example, 1/4 when the number of core blocks is 5.
Only one core block in the block group F to be staggered, or two and one when the number of core blocks is seven
The entire stator may be configured by dividing the blocks into one and arranging the blocks on one side and the other side, respectively.

[Operation] According to the present invention, the block of the core block that constitutes the stator generates a magnetic flux linkage with respect to the axis of the rotor due to the relationship between the number of joints and the number of poles. The stator blocks are axially connected by shifting by 1/4, and the stator blocks of multiples of 4 are connected to form a block group E. One side of this block group or Since the core blocks of the block group F arranged on the other side are displaced from each other by 1/4 to form a circular core, the interlinkage magnetic fluxes with respect to the axes generated from the respective stator blocks cancel each other out, and The shaft voltage that could be generated by the magnetic flux is always prevented.

[Effect of the Invention] The stacking structure of the fan-shaped cores in the rotating electric machine of the present invention is
As described above, the fan-shaped cores are laid one on top of the other by stacking them one on top of the other, forming a core block of multiple multiples of 4, which is a unit, and these core blocks are connected to each other via a ventilation duct. Form a block group E by directly connecting in the axial direction so as to form a 1/4 stack, and further, a predetermined number of circular cores formed by stacking 1/4 of fan-shaped cores on top of each other in the block group E. One side and / or the other side are arranged side by side so as to be coaxial with each other to form a stator core composed of a desired number of core blocks as a block group F as a whole.

Therefore, it has the following excellent effects.

No axial voltage is generated by the interlinkage magnetic flux, and the adverse effects of the axial voltage are always prevented.

Since the present invention can be applied to cases where the core block is not a multiple of 4, the structure of the stator can be made up of a required number of blocks that can be equipped with ventilation ducts of a number matching the cooling capacity of the rotating electric machine. Can perform required cooling.

Further, in the above-mentioned configuration, when the fan-shaped cores are stacked 1/2 or 1/4 on each other to form a circular core, the blocks of each core are composed of 2 or 3 cores, respectively, or If they are stacked 1/4 apart and stacked, the efficiency of the core stacking work can be greatly improved.

[Brief description of drawings]

FIG. 1 is a front view of a half section showing an embodiment of the present invention. Further, FIGS. 2 to 4 show a conventional example, of which,
2 and 3 (a) to (b) and FIG. 4 (a) are perspective views, respectively, and FIG. 4 (b) is a side view. 4a ₁ ~4a _4: core block C ₁ -C _5: ventilation duct E, F: block group

Claims (2)

[Scope of utility model registration request] 1. A core block of circular cores of a multiple of 4, which is a unit in which fan-shaped cores are shifted from each other by 1/2 and are laminated to form a core block, and these core blocks are connected to each other through a ventilation duct. The parts are directly connected to each other in the axial direction so as to form a 1/4 stack to form a block group E, and further, a predetermined number of circular cores are formed by stacking 1/4 of fan-shaped cores on each other to form the block group E. A fan-shaped core in a rotating electric machine, characterized in that a stator core composed of a desired number of core blocks is formed as a block group F by being arranged in parallel on one side and / or the other side so as to be coaxial. Stacked structure. 2. When the fan-shaped cores are stacked on each other by 1/2 or 1/4 to form a circular core, the blocks of each core are composed of 2 or 3 cores each of which has a 1/2 or 1 core. The stacking structure of fan-shaped cores in a rotating electric machine according to claim 1, wherein the stacking is performed by / 4 shifting.