JPH07298527A - Rotor structure for electric rotating machine with laminated core - Google Patents

Abstract

PURPOSE:To provide a rotor core for an electric rotating machine with laminated core in which the wobbling on of a rotary shaft can be minimized. CONSTITUTION:Unit core plates 12, integer times the number N of slots, are laminated while turning by a predetermined angle to form a laminated core 10. For example, the number N of slots is '3', the total number of unit core plates is '15' and the turning angle is set equal to the interval of one slot, i.e., 120 deg.. When fifteen unit core plates 12 are laminated while turning at such angle, the punching phase angle makes a round every three plates and the eccentric force of each plate is offset. Furthermore, since the number of unit core plates 12 constituting the laminated core 10 is equal to an integer times the number of plates for one round at the phase angle (equal to the number N of slots), the total eccentric force is also minimized for the entire laminated core 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor structure of a rotary electric machine having a laminated core used for a small inner rotor type motor or generator.

[0002]

2. Description of the Related Art Generally, a laminated core of a rotor used in an inner rotor type motor or a generator has a thickness of, for example, 0.
It is formed by punching a metal plate material such as a silicon steel plate or an electromagnetic soft steel plate of about 5 mm or 1 mm with a press to form an iron core veneer, and stacking and punching a predetermined number of the punched iron core veneers. After that, the rotary shaft is press-fitted into the laminated core thus formed, and then a commutator is attached and winding is performed for each slot to complete the rotor.

However, the above-mentioned metal material for punching the iron core veneer has a non-uniform thickness due to the bending of the rolling rolls produced during manufacturing, and the iron core veneers are laminated while maintaining the punched angular phase. In this case, the core single plates are stacked in a state where the plate thicknesses are non-uniform in the same direction, so that a stacking thickness deviation occurs. In addition, the stack thickness deviation deteriorates the parallelism of the rotor due to displacement and eccentricity between the outer diameter, the inner diameter, and the slot in the iron core single plate punched by the progressive die. When the motor is rotating, the rotor thickness becomes uneven due to stacking thickness deviation and eccentricity, which causes performance deterioration of the rotating electric machine and generation of abnormal noise.Therefore, the rotor balance must be corrected. .

As a technique for solving such an inconvenience, there is a rotor manufacturing method disclosed in Japanese Patent Publication No. 4-23497. In this method, the core single plates are punched out and then the core single plates are laminated by rotating them by an angle of one slot or several slots, and the stacking thickness deviation of the entire laminated core is averaged. .

[0005]

By the way, in the rotor manufacturing method disclosed in the above-mentioned publication, since each iron core single plate is laminated by being rotated by an angle of one slot or several slots, each iron core single plate is laminated. There is a problem that the runout of the rotating shaft becomes large depending on the positional accuracy of the shaft hole formed in the center of the plate. That is, when the iron core single plates whose shaft holes are eccentric in one direction are rotated and stacked, eccentric forces with equal angular intervals are applied to the rotary shaft, and the runout of the rotary shaft occurs in accordance with the combined force. .

Further, as a conventional technique capable of eliminating such an adverse effect due to the eccentricity of the shaft hole of each iron core single plate, there is a "laminated fixed product" disclosed in Japanese Utility Model Laid-Open No. 60-77267. This laminated fixed product (rotor) is
Only the shaft hole of the core single plate at the end is fitted into the rotary shaft, and the inner diameter of the shaft hole of the core single plate in the middle is set to be larger than the outer diameter of the rotary shaft. Therefore, in the case of such a structure, the runout of the rotary shaft due to the iron core single plate in the middle portion does not occur. However, in this conventional technique, since the rotary shaft is fixed only by the iron core single plate at the end, the fixed strength of the rotary shaft may not be sufficient, and the design requirement may not be satisfied. Not a plan.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a rotor structure for a rotary electric machine having a laminated core capable of minimizing the runout of the rotary shaft. .

[0008]

In order to solve the above-mentioned problems, in the rotor structure of a rotating electric machine according to claim 1, a plurality of iron core veneers formed by punching out a metal material are laminated while being rotated by a predetermined angle. A rotor structure including a laminated core and a rotary shaft press-fitted into the laminated core, wherein the number of the core single plates constituting the laminated core is the number of slots N
And each of the iron core veneers are laminated by shifting the angle by dividing 360 degrees by the number of slots N and forming the inner diameter of the shaft hole of the laminated veneer smaller than the outer diameter of the rotary shaft. By doing so, the iron core single plate and the rotating shaft are fitted together.

According to a second aspect of the rotor structure of the rotating electric machine, a laminated core is formed by laminating a plurality of iron core single plates formed by punching out a metal material while rotating them by a predetermined angle, and a rotary shaft press-fitted into the laminated core. A rotor structure having
The number of the core single plates constituting the laminated core is set to an integral multiple of the number of slots N, and each of the core single plates is set to 3
Lamination is performed by shifting an angle obtained by dividing 60 degrees by a divisor of the number of slots N, and the inner diameter of the shaft hole of the laminated single plate is formed smaller than the outer diameter of the rotary shaft, thereby forming the core single plate and the core single plate. It is characterized in that it is fitted with a rotating shaft.

According to a third aspect of the present invention, there is provided a rotor structure of a rotary electric machine according to the first or second aspect, wherein the core single plate is rotated together with two or more adjacent sheets as a set. The number of core single plates constituting the laminated core is an integer multiple of the slot number N or the slot number N
It is characterized in that the number of iron core veneers constituting the set is further multiplied by an integer multiple of the above.

According to a fourth aspect of the present invention, there is provided a rotor structure for a rotary electric machine according to any one of the first to third aspects, wherein the laminated core is
It is characterized in that it further includes one or more iron core veneers as a fraction, and the inner diameter of the shaft hole of the iron veneer as a fraction is larger than the outer diameter of the rotary shaft.

[0012]

According to the invention of claim 1, the core single plates are stacked while being shifted by one slot, and the number of the core single plates constituting the laminated core is an integral multiple of the number N of slots. Therefore, when considering the eccentric force applied to the rotary shaft from each core single plate of the laminated core by considering N core single plates as a set, the sum of the eccentric forces by the N core single plates forming each set is minimized. . Since the total eccentric force of the whole laminated core is an integral multiple of the sum of the eccentric forces of the N iron core veneers, the runout of the rotating shaft caused by the eccentric force of all the iron core veneers is also minimized. be able to. Further, since the rotary shaft is fitted with each iron core single plate, sufficient fixing strength can be secured.

Further, in the invention of claim 2, the rotation angle of the iron core veneer at the time of lamination is set to [a value obtained by dividing 360 degrees by a divisor of the number of slots N]. The number of iron core veneers to be formed is an integral multiple of this slot number N. That is, in order to minimize the sum of the eccentric forces in units of a plurality of iron core single plates as in claim 1 described above, N iron core single plates are stacked while being shifted by one slot, and a plurality of slots are also used. Minutes (360 degrees multiplied by the divisor of the number of slots N) may be shifted at a time. In addition, the set in which the sum of the eccentric forces at this time is the minimum is the number of iron core veneers corresponding to a divisor of the number N of slots, and the number of iron veneers constituting the laminated core is the divisor of this number N of slots. It should be an integral multiple of.

By thus forming the laminated core by laminating the iron core single plates while shifting the angles by several slots, the runout of the rotating shaft caused by the eccentric force of each iron core single plate can be minimized. it can. Also in this case, since the rotary shaft is fitted to each iron core single plate, sufficient fixing strength can be secured.

Further, in the invention of claim 3, in the above-mentioned claim 1 or claim 2, each of the iron core veneers is 1
Although the sheets are stacked one after another by shifting them one by one, two or more sheets of them are grouped together and are shifted together. That is, the sum of the eccentric forces of the iron core veneers until the punching phase of the iron core veneers completes one cycle and returns is the minimum. Further, at this time, the number of iron core single plates having the minimum sum of the eccentric forces is the number of slots N and the number of cores forming each set when stacking by shifting by one slot as shown in claim 1. The number of slots multiplied by the number of slots N and the number of cores forming each group when stacking by shifting by several slots (360 degrees divided by a divisor of the number of slots N) as described in claim 2. A value obtained by multiplying the number of sheets by [the number of angles obtained by dividing 360 degrees by a divisor of the number of slots N] may be used as the number of sheets.

By thus forming a laminated core by arranging a plurality of iron core single plates together and shifting them by a predetermined angle, the runout of the rotary shaft caused by the eccentric force of each iron core single plate can be minimized. You can Also in this case, since the rotary shaft is fitted to each iron core single plate, sufficient fixing strength can be secured.

Further, in the invention of claim 4, when there is a fraction in the number of core veneers constituting the laminated core, the inner diameter of the shaft hole of the core veneers corresponding to this fraction is increased to fit the rotary shaft. I try not to match. In general, the number of iron core veneers forming the laminated core is determined in consideration of the thickness of the iron core veneers, the output characteristics of the rotating electric machine, and the like. The number of slots N is not necessarily an integral multiple. Therefore, when a fraction is generated (for example, when the number of slots is 3 and the total number of core veneers is 16, one core veneer corresponds to this fraction), it corresponds to this fraction. By increasing the shaft hole diameter of the iron core veneer, the eccentric force due to the iron core veneer is prevented from occurring, and the sum of the eccentric forces of the iron core veneers is minimized as in the case of claims 1 to 3. Become.

As described above, even when the laminated core is formed by using an arbitrary number of iron core single plates, the runout of the rotary shaft caused by the eccentric force of each iron core single plate can be minimized. Also in this case, since the rotary shaft fits most of the iron core single plates, sufficient fixing strength can be secured. Furthermore, since the total number of iron core veneers is arbitrary, the degree of freedom in design can be increased.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotor structure of an embodiment to which the present invention is applied will be specifically described below with reference to the drawings.

[First Embodiment] FIG. 1 is a view showing the rotor structure of the first embodiment, in which a rotary shaft 50 and a laminated core 1 are shown.
The assembled state with 0 is shown. 2 is a view showing a cross section taken along the line AA of FIG. The rotor structure shown in these figures is used, for example, in a small motor, and in particular, the present invention is suitable when using a rotating shaft having a relatively weak strength, that is, a flexible shaft.

The laminated core 10 of this embodiment has the number N of slots.
It is formed by stacking and crimping the iron core single plates 12 in an integral multiple of the number. For example, the laminated core 1 of this embodiment
The number N of slots of 2 is "3", and the number of the single iron core plates 12 is "15".

Each core single plate 12 (12-1, 12-2, ...)
Has three slots 14 and three core teeth portions 16 formed therebetween. The three core teeth portions 16 or the three slots 14 are formed at equal intervals of 120 degrees.

(N-1) core single plates 12-2, 12 excluding the core single plate 12-1 located at one end of the laminated core 10.
-3, ... are fitted in the respective parts of the respective core teeth parts 16 for the fitting positioning recesses 18 (18a, 18b, 18).
c) is formed, and when the iron core single plates 10 are stacked, the fitting position matching concave portion 18 and the convex portion formed on the opposite side at the same time are fitted to each other and are caulked to be integrated. The laminated core 12 is formed.
In practice, while restraining the outer peripheral portion of the core teeth portion 16, each iron core single plate positioned by the fitting alignment recess 18 is fitted and caulked, so that the outer periphery of the laminated core 10 is not shown. The output performance is made uniform by making the gap with the inner circumference of the stator almost constant.

Further, a through hole 20 is formed in the iron core single plate 12-1 located at the end portion at a position corresponding to the above-mentioned fitting positioning concave portion 18, and this through hole 2 is formed at the time of stacking.
0 is fitted to the convex portion on the back side of each fitting alignment concave portion 18 of the iron core single plate 12-2. Moreover, the projecting portions of the iron core single plate 12-2 are not exposed from the end surface of the laminated core 10 by the through holes 20, and it is possible to prevent the assembling property and the yield from being deteriorated by the unnecessary projecting portions.

By the way, the feature of this embodiment is that the number of the iron core veneers 12 constituting the laminated core 10 is set to an integral multiple of the number of slots N (= 3), and each iron core veneer 1 is
2 is to perform stacking while rotating 2 at slot intervals, that is, rotating by 120 degrees.

For example, when fifteen iron core veneers 12-1 to 12-15, which are integer multiples of the number of slots "3", are laminated, the iron core veneers 12-1 to 12-15 have the same punching phase. Lamination is performed such that certain fitting alignment recesses 18a are displaced from each other by 120 degrees.

FIG. 3 is an enlarged and exploded view of the vicinity of one of the fitting positioning recesses 18 formed in the core single plate 12, and shows the laminated state of the adjacent core single plates 12.

As shown in the figure, the core single plates 12 are stacked with a shift of one slot each time the layers change. Therefore, the fitting positioning recess 18a of the iron core veneer 12 of a certain layer corresponds to the fitting positioning recess 18b of the core veneer 12 of the next layer, and the fitting positioning recess 18c of the next layer corresponds. Therefore, the fitting position alignment recesses 18a and the like are cycled once every three layers corresponding to the number of slots so as to be in the same phase.

FIG. 4 and FIG. 5 are views for explaining the eccentric force of each iron core veneer 12 in the case of laminating in this way. The eccentric state of the shaft hole 22 when performing is shown. FIG. 4A shows the eccentric force state by one iron core single plate 12, FIG. 4B shows the eccentric force state by two iron core single plates 12, and FIG. 5 shows the number of slots “3”. The state in which the eccentric forces by the iron core veneers 12 corresponding to the above are combined is shown.

The chain double-dashed line circle shown in these figures is a virtual coaxial circle 24, and shows the position of the shaft hole 22 of each core single plate 12 when ideal punching is performed from a metal plate material. When the rotary shaft 50 is press-fitted while rotating each core single plate 12, it can be considered that the rotary shaft 50 is press-fitted to the position of the virtual coaxial circle 24. The shaft hole 22 actually formed in the iron core single plate 12 can be formed within a range of high dimensional accuracy, but it cannot be formed at an ideal position, and the allowable range is Within the same tendency, a slight deviation occurs.

FIG. 4A is an enlarged view showing the deviation between the shaft hole 22 actually formed and the virtual concentric shaft 24. Due to this deviation (eccentricity), the excessive press-fitting portion 26 of the rotary shaft 50 is shown. Appears. Therefore, the eccentric force due to the excessive press-fitting portion 26 acts on the rotary shaft 22, and the runout of the rotary shaft 50 in one direction occurs. Therefore, when only one iron core veneer 12 is focused on, an eccentric force is generated in the direction indicated by the arrow a in FIG.

Next, paying attention to the two iron core veneers 12 stacked by shifting by one slot interval, as shown in FIG. 4 (B), the eccentric force indicated by the arrow a by one iron core veneer 12 is obtained. Occurs, and an eccentric force indicated by an arrow b is generated by the other iron core veneer 12 laminated by being shifted by 120 degrees. Therefore, the sum of these two eccentric forces causes the rotation shaft 50 to shake in the direction indicated by the arrow c.

Furthermore, one slot interval (120
Focusing on the three iron core veneers 12 that are stacked with a deviation of (degree), as shown in FIG. 5, eccentric forces are generated by the iron core veneers 12 in the directions of arrows a, b, and d that are offset by 120 degrees from each other. To do. Therefore, when these three eccentric forces are combined, these eccentric forces cancel each other out, so that the sum of the eccentric forces acting on the rotary shaft 22 is minimized and the runout of the rotary shaft 50 is also minimized.

As described above, the interval of 1 slot is 12
When the core single plates 12 are stacked while being shifted by 0 degree, the runout of the rotary shaft 50 caused by the three core single plates 12 equal to the number of slots is minimized. Therefore, if the number of core single plates 12 constituting the laminated core 10 is set to be an integral multiple of the number of slots “3”, the laminated core 10
The total runout of the rotary shaft 50 is also minimized.

FIG. 6 shows the relationship between the number of core single plates 12 constituting the laminated core 10 and the runout of the rotary shaft 50. Actually, 16 core single plates 12 with the number of slots “3” are shown. With respect to the rotor having the laminated core 10 configured by stacking the sheets by shifting by 120 degrees, the runout of the rotary shaft 50 is measured when the number of the laminated cores 12 is reduced by one.

As shown in the figure, when the number of the iron core single plates 12 becomes 15, 12 and 9 which are integer multiples of the number of slots "3", the shaft runout decreases. From this measurement result, it was confirmed that the eccentric force of each iron core veneer 12 was almost canceled every three sheets, and the runout of the rotary shaft 22 was minimized.

[Second Embodiment] FIG. 7 is a diagram showing a rotor structure of a second embodiment, and shows a sectional structure corresponding to FIG. For example, the number of slots is “3”, and the case where the laminated core 10 is composed of 16 iron core single plates 12 is shown.

In the rotor structure of the first embodiment described above, the core single plates are laminated while rotating at the intervals of the slots 14, and the total number of core single plates 12 constituting the laminated core 10 is an integer multiple of the number N of slots. On the other hand, the rotor structure of this embodiment has the core single plate 12 forming the laminated core 10.
Is characterized in that the total number of slots is set to a number other than an integer multiple of the number of slots N. It is the same that the core single plates 12 are stacked while being rotated at intervals of the slots 14.

That is, when the number of the core single plates 12 constituting the laminated core 10 can be arbitrarily set, the number of the core single plates 12 constituting the laminated core 10 is set as described in the first embodiment. Should be set to an integral multiple of the number of slots N. However, there is a case where the total number of the single iron core plates 12 must be set to a value other than an integral multiple due to output performance and the like, and even in such a case, it is necessary to minimize the runout of the rotary shaft 50.

The laminated core 10 of this embodiment is composed of, for example, 16 iron core single plates 12. This number "1
"6" is not an integer multiple of the number of slots, but an integer multiple "1.
5 "is a fraction.

FIG. 8 is a diagram showing a partially enlarged cross section of FIG. 7, in which the shaft hole 22 of one iron core veneer 12 which is a fractional number.
Details of the neighborhood are shown. As shown in FIG. 8, in the present embodiment, the shaft hole 2 of the iron core veneer 12 which becomes a fraction is used.
The diameter of 2 is formed larger than the outer diameter of the rotary shaft 50. That is, when the rotary shaft 50 is press-fitted into the laminated core 10, only the iron core veneer 12 having this fraction is not fitted to the rotary shaft 50, and an eccentric force is applied to the rotary shaft 50 from the iron core veneer 12. Nor.

As described above, when the number of the iron core single plates 12 constituting the laminated core 10 is set to a value other than an integral multiple of the slot number N, the integral multiple of the slot number N is the same as that of the first embodiment. Lamination is performed in the same manner, and for the other fractions, a gap is provided between the rotary shaft 50 and the rotary shaft 50 so that an eccentric force is not applied to the rotary shaft 50.
Therefore, as in the first embodiment, the runout of the rotary shaft 50 can be minimized.

FIG. 9 is a diagram showing a modification of the rotor structure of this embodiment, and FIG. 10 is a partially enlarged sectional view thereof. These figures correspond to FIG. 7 and FIG.
The case where the number of the iron core veneers 12 constituting 0 is set to "17" is shown.

In this case, since the number of the iron core single plates 12 which is a fraction is "2", the two iron core single plates 12-1 and 12-17 located at both ends of the laminated core 10 correspond to the fraction. However, regarding these, the inner diameter of the shaft hole 22 is
It is also formed to have a large outer diameter of zero. Therefore,
Also in this case, as in the case where the laminated core 10 is configured by the 16 iron core single plates 12, the eccentric force is not applied to the rotary shaft 50 from the iron core single plates 12, which is a fraction, and the runout of the rotary shaft 50 is prevented. Can be kept to a minimum.

The present invention is not limited to the above embodiment, but various modifications can be made within the scope of the gist of the present invention.

For example, in each of the above-described embodiments, the core single plates 12 are stacked while the angles corresponding to the intervals of the slots are shifted to form the laminated core 10, but the number N of slots other than 1. If a divisor exists,
The stacking may be performed while shifting the angle corresponding to the interval between the plurality of slots. That is, the lamination may be performed while shifting the angle of each core veneer 12 divided by the divisor of the number of slots N. Even in this case, the eccentric forces of the core veneers 12 cancel each other out. As a result, the combined force is minimized, and the shake of the rotary shaft 50 can be minimized.

For example, when the number of slots is "6", there are "3" and "2" as divisors other than 1, so 3
1 which is the angle obtained by dividing 60 degrees by "3" or "2"
20 degrees (corresponding to an interval of 2 slots) or 18
Lamination is performed while rotating the core single plate 12 at 0 degrees (corresponding to an interval of 3 slots).

However, in this case, since the punching phase of the iron core single plate 12 makes one cycle for each number of the iron core single plates 12 corresponding to the divisor of the number of slots, the total number of the iron core single plates 12 forming the laminated core 10 is made. It may be set to an integer multiple of the number N of slots.

Further, when the laminated core 10 is constructed by using the number of iron core single plates 12 other than an integer multiple of this slot number N, the shaft hole of the iron core single plate 12 becomes a fraction of this integer multiple. Only the diameter of 22 should be large as described in the second embodiment.

Further, in each of the above-mentioned embodiments, the iron core veneers 12 constituting the laminated core 10 are rotated one by one by an angle corresponding to one slot interval. However, two or more sheets are combined together. You may make it laminate | stack, rotating. In this case as well, the eccentric forces due to these for each of the plurality of iron core single plates 12 cancel each other out, so that the runout of the rotary shaft 50 when the rotary shaft 50 is press-fitted into the laminated core 10 is minimized.

However, in this case, the number of the iron core veneers 12 to be rotated together is multiplied by the number N of slots (for each of the iron core veneers 12 to be rotated, the iron cores to be rotated together are rotated when a plurality of slots are rotated). (For each number of iron core veneers 12 obtained by multiplying the number of veneers 12 by the divisor of the number of slots N), the iron core veneers 12
Since the punching phases of the core core make one round, the total number of the core single plates 12 constituting the laminated core 10 is [the core single plate 1 to be rotated together.
2] x [slot number N] (integer multiple of [number of iron core veneers 12 to rotate together] x [divisor of slot number N] when rotating multiple slots) You can set it to.

Further, in the above-described second embodiment, the iron core veneer 12 which is the fraction is arranged at the end of the laminated core 10. However, the iron core veneers 12 corresponding to this fraction are laminated core 1.
It may be inserted inside 0, and the insertion place is not particularly limited.

However, when there is one iron core veneer 12 which is a fraction, it is desirable to arrange the iron core veneers 12-1 corresponding to this fraction at the position shown in FIG. In particular, since it is necessary to form the through hole 20 only in the iron core single plate 12 arranged at this position,
It is necessary to manufacture a die separately from the other die for punching the iron core single plate 12. For this reason, it is possible to increase the diameter of the shaft hole 22 by using a separately manufactured mold, and there is no need to add additional molds or processes. There is an advantage that can be.

[0054]

As described above, according to the invention of claim 1, the core single plates are stacked while being shifted by one slot, and the number of the core single plates constituting the multilayer core is set to an integral multiple of the number N of slots. Since the sum of the eccentric forces applied to the rotary shaft from each iron core veneer is minimized for each N core veneers, the total eccentric force due to the entire laminated core is minimized and the runout of the rotary shaft is also minimized. be able to. Further, since the rotary shaft is fitted with each iron core single plate, sufficient fixing strength can be secured.

According to the second aspect of the present invention, the rotation angle of the core single plate during lamination is set to [a value obtained by dividing 360 degrees by a divisor of the number of slots N]. The number of the single iron core plates constituting the above is set to be an integral multiple of this slot number N. That is, in order to minimize the sum of the eccentric forces in units of a plurality of iron core single plates as in claim 1 described above, N iron core single plates are stacked while being shifted by one slot, and a plurality of slots are also used. Minutes (360 degrees multiplied by the divisor of the number of slots N) may be shifted at a time. By forming the laminated core by laminating the iron core single plates while shifting the angle by several slots as described above, the runout of the rotary shaft caused by the eccentric force of each iron core single plate can be minimized. Also in this case, since the rotary shaft is fitted to each iron core single plate, sufficient fixing strength can be secured.

According to the third aspect of the invention, two or more iron core veneers are displaced together, and the punching phase of the iron core veneers returns once. The sum of the eccentric forces of each iron core veneer up to is still the minimum. As described above, by forming a laminated core by arranging a plurality of iron core single plates as a set and shifting them together by a predetermined angle, the runout of the rotary shaft caused by the eccentric force of each iron core single plate can be minimized. Also in this case, since the rotary shaft is fitted to each iron core single plate, sufficient fixing strength can be secured.

According to the fourth aspect of the present invention, when the number of iron core veneers forming the laminated core has a fraction, the inner diameter of the shaft hole of the iron core veneers corresponding to this fraction is increased to form a rotary shaft. They are not fitted to each other so that the eccentric force due to the iron core single plate for this fraction is not generated. Therefore, even when the laminated core is configured by using an arbitrary number of iron core single plates, the runout of the rotary shaft caused by the eccentric force of each iron core single plate can be minimized. Also in this case, since the rotary shaft fits most of the iron core single plates, sufficient fixing strength can be secured. Furthermore, since the total number of iron core veneers is arbitrary, the degree of freedom in design can be increased.

[Brief description of drawings]

FIG. 1 is a diagram showing a rotor structure of a first embodiment.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an exploded view in which a part of the laminated core shown in FIG. 2 is partially enlarged.

FIG. 4 is a diagram for explaining an eccentric force of each iron core single plate.

FIG. 5 is a diagram for explaining an eccentric force of each iron core single plate.

FIG. 6 is a diagram showing the relationship between the number of core single plates constituting the laminated core and the runout of the rotary shaft.

FIG. 7 is a diagram showing a rotor structure of a second embodiment.

FIG. 8 is a partially enlarged view showing a part of the laminated core shown in FIG.

FIG. 9 is a diagram showing another example of the rotor structure of the second embodiment.

FIG. 10 is a partial enlarged view showing a part of the laminated core shown in FIG.

[Explanation of symbols]

 10 Laminated Core 12 Iron Core Single Plate 14 Slot 16 Core Teeth 18 Recess for Fitting Position 20 Through Hole 22 Shaft Hole 50 Rotating Shaft

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Shimizu 390 Umeda, Kosai City, Shizuoka Prefecture Asmo Stock Association In-house

Claims (4)

[Claims] 1. A rotor structure comprising: a laminated core in which a plurality of core single plates formed by punching out a metal material are laminated while being rotated at a predetermined angle; and a rotary shaft press-fitted into the laminated core. The number of the core single plates constituting the laminated core is set to an integer multiple of the number of slots N, and each of the core single plates is laminated while shifting the angle by dividing 360 degrees by the number of slots N, and A rotor structure for a rotary electric machine having a laminated core, wherein the core single plate is fitted to the rotary shaft by forming the inner diameter of the shaft hole smaller than the outer diameter of the rotary shaft. 2. A rotor structure comprising: a laminated core in which a plurality of core single plates formed by punching out a metal material are laminated while rotating at a predetermined angle; and a rotary shaft press-fitted into the laminated core. The number of the core single plates constituting the laminated core is set to an integer multiple of the number of slots N, and each of the core single plates is set to 3
Lamination is performed by shifting an angle obtained by dividing 60 degrees by a divisor of the number of slots N, and the inner diameter of the shaft hole of the laminated single plate is formed smaller than the outer diameter of the rotary shaft, thereby forming the core single plate and the core single plate. A rotor structure for a rotary electric machine having a laminated core, characterized by being fitted to a rotary shaft. 3. The iron core veneer according to claim 1 or 2, wherein the iron core veneer is rotated together as a set of two or more adjacent sheets, and A rotary electric machine having a laminated core, wherein the number of slots is an integer multiple of the slot number N or an integer multiple of a divisor of the slot number N is further multiplied by the number of iron core single plates constituting the set. Rotor structure. 4. The laminated core according to any one of claims 1 to 3, wherein the laminated core further includes one or a plurality of iron core veneers, which are fractions, and a shaft hole of the iron core veneer having the fractions. A rotor structure for a rotary electric machine having a laminated core, wherein an inner diameter of the rotor is formed larger than an outer diameter of the rotary shaft.