JP5237776B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

In some conventional rotating electrical machines, a yoke is provided on the outer side of an iron core piece of an annular steel plate, and a teeth part is provided on the inner side, and a predetermined number of these are laminated to constitute a stator. In order to fix the stator, a predetermined number of fixing holes are passed through the yoke portion of the stator at equal intervals in the axial direction of the stator, and are fixed to fixing holes provided in the housing through bolts. .
At this time, in order to determine an accurate mounting position of the stator, first, the stator is temporarily fixed in the housing. Next, a special correction device is inserted into the stator, and the positional relationship between the rotor and the stator to be inserted later is measured. Then, a correction value for the current position of the stator is calculated, and based on this, the stator is moved to an appropriate position and then fixed again. (Patent Document 1)

JP, 2007-166705, A FIG. 3, FIG. 9-FIG. 13 Paragraph 0061-Paragraph 0074

In the conventional example, all the holes for fixing the stator are opened in the integrated yoke, so if you try to increase the positioning accuracy by reducing play between these holes and the fixing holes of the housing and the bolts, the processing accuracy Due to this problem, it is difficult to insert and fix all the bolts at predetermined positions.
In addition, the larger the stator, the larger the number of holes for fixing, and the larger the bolts for fixing. As the number of bolts increases, the number of interference elements increases and the accuracy cannot be increased. Therefore, there is a problem that it is necessary to correct the position after leaving play.

  The present invention has been made to solve the above-described problem, and does not require a special correction device, and by simply assembling the connected divided laminated cores according to the fixing holes, the iron cores can be accurately placed at predetermined positions. The purpose is to provide a rotating electric machine that can be fixed.

The rotating electrical machine according to this invention is
A stator having a laminated fixed iron core;
A housing for fixing the stator;
In a rotating electrical machine comprising a rotor that rotates opposite to the stator,
The laminated fixed iron core is formed in an annular shape by connecting a plurality of divided laminated iron cores, each having a core piece having a yoke part and a tooth part, so as to be rotatable at the yoke part, and is provided in the lamination direction of the yoke part. In the rotating electrical machine to be fixed to the fixing hole of the housing by a bolt inserted into the hole ,
The diameter of a circle passing through the center of each fixing hole formed in the housing is larger than the diameter of a circle passing through the center of each hole of the laminated fixed iron core before being attached to the housing.

The rotating electrical machine according to the present invention is
A stator having a laminated fixed iron core;
A housing for fixing the stator;
In a rotating electrical machine comprising a rotor that rotates opposite to the stator,
The laminated fixed iron core is a combination of a plurality of divided laminated iron cores configured in an arc shape by connecting a plurality of divided laminated iron cores, each of which has a yoke part and a tooth part, laminated to be rotatable at the yoke part. The divided laminated cores at least at both ends of each of the divided laminated core groups are fixed in fixed holes opened in the housing by bolts inserted into holes provided in the lamination direction of the yoke portion. In electric
The diameter of a circle passing through the center of each fixing hole formed in the housing is larger than the diameter of a circle passing through the center of each hole of the laminated fixed iron core before being attached to the housing .

The rotating electrical machine according to this invention is
A stator having a laminated fixed iron core;
A housing for fixing the stator;
In a rotating electrical machine comprising a rotor that rotates opposite to the stator,
The laminated fixed iron core is formed in an annular shape by connecting a plurality of divided laminated iron cores, each having a core piece having a yoke part and a tooth part, so as to be rotatable at the yoke part, and is provided in the lamination direction of the yoke part. In the rotating electrical machine to be fixed to the fixing hole of the housing by a bolt inserted into the hole ,
Since the diameter of the circle passing through the center of each fixing hole opened in the housing is larger than the diameter of the circle passing through the center of each hole of the laminated fixed iron core before being attached to the housing , By simply fixing the stator to the housing, the axes of the stator and the rotor can be accurately aligned.

The rotating electrical machine according to the present invention is
A stator having a laminated fixed iron core;
A housing for fixing the stator;
In a rotating electrical machine comprising a rotor that rotates opposite to the stator,
The laminated fixed iron core is a combination of a plurality of divided laminated iron cores configured in an arc shape by connecting a plurality of divided laminated iron cores, each of which has a yoke part and a tooth part, laminated to be rotatable at the yoke part. The divided laminated cores at least at both ends of each of the divided laminated core groups are fixed in fixed holes opened in the housing by bolts inserted into holes provided in the lamination direction of the yoke portion. In electric
Since the diameter of the circle passing through the center of each fixing hole opened in the housing is larger than the diameter of the circle passing through the center of each hole of the laminated fixed iron core before being attached to the housing , By simply fixing the laminated core group to the housing, the axis of the stator and the rotor can be accurately aligned.

Embodiment 1 FIG.
A configuration of a rotary electric machine 1 according to Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a one-side cross-sectional view of a rotating electrical machine 1 according to Embodiment 1 of the present invention.
The rotating electrical machine 1 is fitted with an annular housing 2, an annular stator 3 attached to the outer peripheral portion of the upper surface of the housing 2, and the stator 3 concentrically with the inner periphery of the housing 2, and supported and fixed on the upper surface of the housing 2. The shaft 4 protrudes in the vertical direction of the housing 2 and the annular rotor 6 is attached to the shaft 4 via a bearing 5 and rotates around the shaft 4. The magnet 7 attached to the outer peripheral surface of the rotor 6 rotates while facing the inner peripheral surface of the stator 3.

Next, the detailed configuration of each part will be described. FIG. 2 is a plan view of a laminated fixed iron core 31 in which 72 divided laminated iron cores 32 are connected in an annular shape.
A stator 3 shown in FIG. 1 is obtained by winding a coil around a tooth portion 33 of each divided laminated core 32 of the laminated fixed iron core 31.
3 and 4 are enlarged plan views of the main part of the laminated fixed iron core 31. FIG.
Although not shown, each of the divided laminated cores 32 is formed by alternately laminating two types of iron core pieces, and provided with connecting portions 36 in which the yoke portions 34 of the core pieces of the adjacent divided laminated cores 32 are alternately overlapped. Further, as shown in FIG. 3, the connecting portion 36 is provided with a shaft 35 so that the adjacent divided laminated core 32 can freely rotate. A coil can be easily wound around the teeth by extending the connecting portion 36 to the anti-teeth side. When the ends of the split laminated iron core 32 at both ends are finally welded and joined, an annular stator 3 is obtained.

FIG. 4 shows a state in which the connecting portions 36 of all the divided laminated cores 32 are rotated in the inner direction of the laminated fixed iron core 31 around the shaft 35. In this state, the laminated fixed iron core 31 is circular. At this time, the yoke portions 34 of the adjacent divided laminated cores 32 abut against each other and interfere with each other, and the connecting portion 36 is structured not to be bent further inward. Since the laminated fixed iron core 31 is composed of 72 divided laminated iron cores 32, the adjacent divided laminated iron cores 32 will be described with reference to the shaft 35 from the state in which the two divided laminated iron cores 32 are joined so as to be aligned linearly. It is rotating inward by 360/72 = 5 degrees to the center.
Thus, when the number of the divided laminated cores 32 constituting the laminated fixed iron core 31 is N, the divided laminated iron cores 32 adjacent to each other via the connecting portion 36 are moved from the horizontal state to the inner side of the laminated fixed iron core 31. If the structure can be rotated only by / N degrees, the shape of the laminated fixed iron core 31 having an ideal shape can be obtained in a state where all the connecting portions are rotated inward as much as possible.

Next, a method for fixing the stator 3 to the housing 2 will be described with reference to FIGS. 1, 4, 5, and 6.
FIG. 5 is an enlarged view of the main part of FIG.
The yoke portion 34 of the divided laminated core 32 is provided with a reamer bolt hole 37 penetrating in the lamination direction of the divided laminated core 32. The stator 3 is fixed to the reamer fixing hole 21 formed in the housing 2 through the reamer bolt 8 in the hole 37.
A male screw portion 80 is cut at the tip of the reamer bolt 8, and a female screw portion 22 is cut behind the reamer fixing hole 21. A tapered portion 82 is provided at the boundary between the male screw portion 80 and the shaft portion 81 of the reamer bolt 8. The male screw part 80 is slightly thinner than the shaft part 81, and the female screw part 22 screwed into the male screw part 80 has an inner diameter smaller than the opening of the reamer fixing hole 21. As a result, the tip of the reamer bolt 8 can be easily inserted into the reamer fixing hole 21.
It should be noted that at least two divided laminated iron cores 32 are fixed. The reason will be described later.

Next, the positional relationship between the reamer fixing hole 21 opened in the housing 2 and the reamer bolt hole 37 provided in the yoke portion 34 of the divided laminated core 32 will be described with reference to FIG.
FIG. 6 shows the position of the reamer bolt hole 37 provided in the yoke portion 34 of the split laminated iron core 32 used when the annularly formed stator 3 is fixed to the housing 2 (●) and the reamer fixing hole opened in the housing 2. It is a top view which overlaps and shows the position of 21 (circle mark).
In the figure, for the sake of explanation, two reamer bolt holes 37 are indicated by reamer bolt holes 137 and 237, respectively. Similarly, two reamer fixing holes 21 are displayed as reamer fixing holes 121 and 221, respectively.
As shown in FIG. The diameter of the circle passing through the center of each circle is set to be greater than the diameter of the circle passing through the center of each circle. For ease of explanation, circles of clearly different sizes are drawn in the figure, but in reality they are roughly the same and the circle passing through the center of the circle is slightly enlarged.

Next, the reason why the diameter of the circle passing through the center of the circle is set to be equal to or larger than the diameter of the circle passing through the center of the circle.
As described above, the connecting portions 36 connecting the divided laminated cores 32 can rotate, but the inner portions do not rotate more than a predetermined value, and the connecting portions 36 are rotated inwardly to the maximum. The arrangement of the reamer bolt holes 37 at this time is marked with ●.
In FIG. 6, in order to fix the stator 3 to the housing 2, the reamer bolt 8 is inserted into the reamer fixing hole 137, and the reamer bolt 8 that has come out from below is inserted into the reamer fixing hole 121 marked with ○.

At this time, since all the reamer fixing holes 21 marked with ○ are provided in the same housing 2, the distances between all the circles are determined. That is, the interval between the reamer fixing hole 121 and the reamer fixing hole 221 cannot be changed.
However, each connecting portion 36 can rotate in the direction in which the diameter of the laminated fixed iron core 31 increases from the state of FIG. 6, so that the length between adjacent ● marks, for example, between the reamer bolt holes 137 and 237 The length can be made longer than the state of FIG.
Of course, in order to open some connecting part 36, it is necessary to be able to move some connecting part 36 in the closing direction. For this reason, all the connecting parts are structured to have a slight play at 360 degrees / N degrees as described above.

  Thus, even if there is a certain degree of error in the positional accuracy of the reamer fixing hole 21 and the reamer bolt 8 opened in the housing 2, the rotation of the connecting portion 36 of the divided laminated core 32 that is not directly fixed to the housing 2 is utilized. All the reamer bolts 8 can be inserted and fixed in all the reamer fixing holes 21 by adjusting. The reason why at least two split laminated iron cores 32 fixed to the housing 2 with the reamer bolt 8 is to absorb the error in the positional relationship between the reamer bolt hole 37 and the reamer fixing hole 21 by using the rotation of the connecting portion 36, and This is because it does not affect the fixing position (orientation) of the divided laminated core 32 that is directly fixed to the housing 2.

As described above, by connecting the diameter of the circle passing through the center of the circle mark to be equal to or larger than the diameter of the circle passing through the center of the circle mark, the connected laminated fixed cores can be easily fixed at a predetermined position with high accuracy.
Actually, this error is distributed between the connecting portions 36 and is suppressed to the level of the stress acting on the connecting portions 36, so that the stator 3 can be fixed to the housing 2 with high accuracy simply by tightening the reamer bolt 8. Further, by determining the number and thickness of the reamer bolts 8 according to the driving torque of the rotating electrical machine 1, strong and reliable fixing can be easily realized.

Further, since the stator 3 and the rotor 6 can be accurately aligned with each other by simply fixing the stator 3 to the housing 2 with the reamer bolt 8, the driving vibration and noise of the rotating electrical machine 1 can be reduced.
In addition, according to the present invention, the shape of the stator 3 can be fixed simply by fixing the stator to the housing 2 with the reamer bolt 8, and it is not necessary to separately prepare a cylindrical body for storing the stator 3, thereby reducing the number of parts, Manufacturing cost can be reduced.
Moreover, the energy efficiency improvement by the weight reduction of the rotary electric machine 1 and the recyclability are realizable.
In this embodiment, the structure is provided with a restriction on the rotation angle to the inside of the connecting portion 36. However, even if the structure has no restriction at all, the number of the divided laminated cores 32 to be fixed to the housing 2 is increased. There is no practical problem. In particular, in the case of a structure in which every other divided laminated iron core 32 is fixed, even if the connecting portion 6 has no restriction on the rotation angle, the same effect can be exhibited as in the case where the rotation angle is restricted as described above. .

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG.
FIG. 7 is a plan view of the laminated fixed iron core 131 according to the second embodiment.
In the first embodiment, all the divided laminated iron cores 32 are connected. Finally, the divided laminated iron cores 32 at both ends are joined by welding to form an annular laminated fixed iron core 31.
In this embodiment, not all the divided laminated cores 32 are connected, but are divided into several groups and the groups are arranged in an annular shape. In FIG. 7, split laminated iron cores 132 are arranged at both ends, and seven divided laminated iron cores 32 are connected therebetween to form one divided laminated iron core group 13, and eight of these are assembled to constitute one laminated fixed iron core 131. Yes.

In order to fix the divided laminated core group 13 to the housing 2, the divided laminated cores 132 at least at both ends of the divided laminated core group 13 are fixed using the reamer bolt 8 as in the first embodiment. In FIG. 7, an intermediate divided laminated iron core 32 is further fixed. In addition, a connection structure is not required in the one end part where the divided laminated cores 132 at both ends are not connected, and any shape may be employed as long as the adjacent divided laminated core groups 13 can be arranged in a ring shape. The difference between the divided laminated core 32 and the divided laminated core 132 is only the difference in the connecting portion, and the other structures are the same.
As in the first embodiment, the shape accuracy of the stator can be further improved by adopting a structure in which the connecting portion 36 does not bend more than 360 degrees / N degrees from the horizontal state.
Needless to say, the greater the number of divided laminated cores to be fixed, the closer the laminated fixed iron core 131 is to a circle and the higher the accuracy of the stator.
In addition, in the case of a structure in which every other divided laminated iron core 32 without restriction of the rotation angle is fixed, the rotation angle is restricted even in a connecting portion without restriction of the rotation angle, as in the first embodiment. The same effect as the case can be exhibited.

By adopting such a configuration, the same effect as the rotating electrical machine 1 of the first embodiment can be obtained.
Further, in the first embodiment, since the whole is connected in an annular shape, a slight error is given to the inner rotation angle of the connecting portion 36. However, in this embodiment, the error is absorbed at both ends of each group. Therefore, there is no need for extra play in the rotation angle, and the divided laminated core group 13 of each group can be accurately arranged in an arc shape and fixed to the housing 2.
Furthermore, it is not necessary to weld the end of each divided laminated core group 13 to the end of the adjacent divided laminated core group 13, and the laminated fixed core 131 can be easily manufactured while attaching the divided laminated core group 13 in order.

1 is a lateral cross-sectional view of a rotating electrical machine 1 according to a first embodiment. 2 is a plan view of a laminated fixed iron core 31 according to Embodiment 1. FIG. FIG. 3 is an enlarged plan view of a main part of a laminated fixed iron core 31 (a state where a part of connecting portions is opened) according to the first embodiment. It is the top view to which the principal part of the lamination | stacking fixed iron core 31 (state which closed all the connection parts) of Embodiment 1 was expanded. FIG. 3 is an enlarged view of a main part of the rotating electrical machine 1 according to the first embodiment. In the first embodiment, the position of the reamer bolt hole 37 provided in the yoke portion 34 of the split laminated iron core 32 (marked with ●) and the reamer opened in the housing 2 are used when the annularly formed stator 3 is fixed to the housing 2. It is a top view which overlaps and shows the position of fixing hole 21 (circle mark). 6 is a plan view of a laminated fixed iron core 131 according to a second embodiment. FIG.

Explanation of symbols

1 rotating electrical machine, 2 housing, 21, 121, 221 reamer fixing hole,
22 female thread part, 3 stator, 31, 131 laminated fixed iron core,
32,132 Divided laminated iron core, 33 teeth, 34 yoke, 35 shafts,
36 connecting part, 37, 137, 237 reamer bolt hole, 4 shafts, 5 bearings,
6 Rotor, 7 Magnet, 8 Reamer bolt, 80 Male thread part, 81 Shaft part,
82 taper part, 13 division | segmentation laminated core group.

Claims (6)

A stator having a laminated fixed iron core;
A housing for fixing the stator;
In a rotating electrical machine comprising a rotor that rotates opposite to the stator,
The laminated fixed iron core is formed in an annular shape by connecting a plurality of divided laminated iron cores, each having a core piece having a yoke part and a tooth part, so as to be rotatable at the yoke part, and is provided in the lamination direction of the yoke part. In the rotating electrical machine to be fixed to the fixing hole of the housing by a bolt inserted into the hole ,
A rotating electrical machine characterized in that a diameter of a circle passing through the center of each of the fixing holes formed in the housing is larger than a diameter of a circle passing through the center of each of the holes of the laminated fixed core before being attached to the housing. When the total number of the divided laminated cores constituting the divided fixed iron core is N,
Each connection part that connects the adjacent divided laminated iron cores does not bend to the teeth part side more than 360 / N degrees from a position where the adjacent divided laminated iron cores are linearly arranged. Item 2. The rotating electrical machine according to Item 1 . The rotating electrical machine according to claim 1 or claim 2, wherein the bolt is reamer bolt. A stator having a laminated fixed iron core;
A housing for fixing the stator;
In a rotating electrical machine comprising a rotor that rotates opposite to the stator,
The laminated fixed iron core is a combination of a plurality of divided laminated iron cores configured in an arc shape by connecting a plurality of divided laminated iron cores, each of which has a yoke part and a tooth part, laminated to be rotatable at the yoke part. The divided laminated cores at least at both ends of each of the divided laminated core groups are fixed in fixed holes opened in the housing by bolts inserted into holes provided in the lamination direction of the yoke portion. In electric
A rotating electrical machine characterized in that a diameter of a circle passing through the center of each of the fixing holes formed in the housing is larger than a diameter of a circle passing through the center of each of the holes of the laminated fixed core before being attached to the housing. When the total number of the divided laminated cores constituting the divided fixed iron core is N,
Each of the connecting portions that connect the divided laminated cores adjacent to each other in the divided laminated core group does not bend toward the teeth portion side by more than 360 / N degrees from the position where the adjacent divided laminated cores are linearly arranged. The rotating electrical machine according to claim 4 . The rotating electrical machine according to claim 4 , wherein the bolt is a reamer bolt.

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