CN100514792C - Stator of rotating electric machine - Google Patents
Stator of rotating electric machine Download PDFInfo
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- CN100514792C CN100514792C CNB2006101446000A CN200610144600A CN100514792C CN 100514792 C CN100514792 C CN 100514792C CN B2006101446000 A CNB2006101446000 A CN B2006101446000A CN 200610144600 A CN200610144600 A CN 200610144600A CN 100514792 C CN100514792 C CN 100514792C
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- 238000010586 diagram Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
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- 230000007613 environmental effect Effects 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 5
- 230000006698 induction Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
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- 230000004048 modification Effects 0.000 description 3
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Abstract
The present invention disclosed a stator core of rotating electric machine, stator, and rotating electric machine using them. An outside shape of a stator core body 10 is a polygon which has four or more even number of corners and whose respective diagonal sides L1 and L2 have asymmetrical lengths. In addition, at least two planes are mounted for installing the stator core body 10 to the installing seat 12 in the installing location. In this way, the vibration leaded by the electromagnetism power which is produced by the running of rotating electric machine can be restrained to sufficiently effectively reduce vibration and noise.
Description
The present application is a divisional application of patent applications entitled "stator core and stator of rotating electric machine and rotating electric machine using the same" with application number 021431531, application date 9/13/2002.
Technical Field
The present invention relates to a stator core and a stator of a rotating electric machine, which can sufficiently effectively reduce vibration and noise, in particular, in the rotating electric machine such as a motor, a generator, and a synchronous machine, and a rotating electric machine using them.
Background
Conventionally, as one of rotating electric machines, for example, an induction motor is known.
Fig. 1A is a vertical cross-sectional view showing an example of the structure of such a conventional induction motor.
As shown in fig. 1A, the stator 1 includes a stator frame 2 and a stator core 3 fitted and fixed to the stator frame 2.
The rotor 4 is configured by attaching a rotor core 7 to a rotary shaft 6 supported by a bearing 5.
Recently, however, the speed control of such an induction motor by an inverter (inverter) has been increasing.
However, in the speed control operation using the inverter, since the speed is changed, the frequency of the electromagnetic force is matched with the natural frequency of the stator core 3 of the structural system of the induction motor, and a resonance phenomenon occurs, so that there is a problem that the possibility of generating large vibration and noise becomes very high. In addition, due to the speed variation, the resonance point cannot be avoided.
That is, during the operation of the rotating electrical machine, the vibration mode 8 occurs as the elliptical vibration mode shown by the two-dot chain line in fig. 1B according to the electromagnetic force distribution of the stator core 3. The vibration mode 8 of the stator core 3 is rotated during the operation of the rotating electric machine, and when transmitted to the stator frame 2, the stator frame 2 repeats tension and compression. Thus, strain is generated in the stator frame 2, which causes vibration of the entire rotating electric machine.
However, the conventional rotating electric machine as described above has problems to be solved as follows.
(a) The stator core 3 has a symmetrical cylindrical shape, and it is inevitable that the vibration of the rotating electrical machine increases due to the elliptical vibration mode 8 of the stator core 3 caused by the magnetomotive force distribution of the stator core 3 which is conspicuously generated in the rotating electrical machine with a large capacity, and the stress of each part of the rotating electrical machine increases, which causes a reduction in the life.
(b) In order to obtain rigidity of the stator core 3 capable of withstanding electromagnetic force to reduce vibration and noise, there is a method of increasing the outer diameter of the stator core 3, but this leads to an increase in size and weight of the rotary electric machine.
(c) The general natural frequency is expressed by the above-described equation (f 1).
Wherein, f: natural frequency, K: rigidity, M: and (4) quality.
As described in the above (b), when the rigidity K is increased, the mass M is also increased, so that the natural frequency does not change greatly, and the effect of avoiding the resonance point is small.
(d) When the stator core 3 is large in size and weight, it is needless to say that a large amount of material is required, and the manufacturing equipment, the testing apparatus, and the like are also large in size. For this reason, the manufacturing efficiency of the rotating electric machine is also poor, and it becomes expensive.
Disclosure of Invention
The invention aims to provide a stator core and a stator of a rotating electric machine, which can sufficiently and effectively reduce vibration and noise by inhibiting vibration caused by electromagnetic force generated during the operation of the rotating electric machine.
Another object of the present invention is to provide a rotating electrical machine which can be produced at a low cost with high production efficiency, and which can be produced in a small-scale production and test facility.
The stator of a rotating electrical machine of the present invention is characterized in that: the outer diameter of the stator core main body is polygonal, the number of corners is an odd number of 3 or more, and ribs for supporting the stator core main body to a supporting place are mounted on the sides which are respectively flat, the supporting ribs are used for jointing the stator core and the stator frame, and the mounting height of the supporting ribs and the stator frame is 4/3 times of the middle shaft radius of the distance from the center of the stator core to the outer diameter and the distance from the center of the stator core to the tooth bottom of the stator core.
The stator of a rotating electrical machine of the present invention is characterized in that: the outer diameter of the stator core main body is polygonal, the number of corners is an even number of 4 or more, and ribs for supporting the stator core main body to a supporting place are mounted on the sides which are respectively flat, the supporting ribs are used for jointing the stator core and the stator frame, and the mounting height of the supporting ribs and the stator frame is 4/3 times of the middle axial radius of the distance from the center of the stator core to the outer diameter and the distance from the center of the stator core to the tooth bottom of the stator core.
A stator core for a rotating electric machine according to claim 1 of the present invention is characterized in that: the stator core body has a polygonal outer diameter, the number of corners is an even number of 4 or more, and the lengths of the respective diagonal sides are asymmetrical.
A stator for a rotating electric machine according to claim 2 of the present invention is characterized in that: the stator core of the rotating electric machine according to claim 1 is provided with at least 2 mounting seats for mounting the stator core body to a mounting place.
Here, the seat for mounting the stator core may be 4/3 times the center axis radius of the distance between the average outer diameter of the stator core and the tooth bottom of the stator core.
A stator core for a rotating electric machine according to claim 3 of the present invention is characterized in that: the stator core main body has a polygonal outer diameter, the number of corners is an odd number of 3 or more, and ribs for supporting the stator core main body to a supporting place are attached to the respective sides which become flat surfaces.
A stator core for a rotating electric machine according to claim 4 of the present invention is characterized in that: the stator core main body has a polygonal outer diameter, the number of corners is an even number of 4 or more, and ribs for supporting the stator core main body to a supporting place are attached to the respective sides which become flat surfaces.
Further, a stator for a rotating electric machine according to claim 5 of the present invention is characterized in that: the stator core of the rotating electric machine according to claim 3 is joined to a stator frame by the supporting ribs.
Further, a stator for a rotating electric machine according to claim 6 of the present invention is characterized in that: the stator core of the rotating electric machine according to claim 4 is joined to a stator frame by the supporting ribs.
Here, the supporting rib and the stator core main body may be integrated. The stator core main bodies may be laminated in a skewed manner. Further, the height of the support rib attached to the stator core to the stator frame may be 4/3 times the radius of the middle shaft between the distance from the center of the stator core to the outer diameter and the distance from the center of the stator core to the bottom of the tooth groove of the stator core (i.e., 4/3 times the radius of the shaft having a center at the center of the stator core, which is one-half of the sum of the two distances).
Further, a rotating electrical machine according to claim 7 of the present invention is a rotating electrical machine including a stator and a rotor, characterized in that: the stator is constituted by the stator core according to any one of the above 1 st aspect, 3 rd aspect and 4 th aspect.
A rotating electrical machine according to claim 8 of the present invention is a rotating electrical machine including a stator and a rotor, characterized in that: the stator is the stator according to any one of the above 2, 5 and 6.
Therefore, in the invention according to claim 1, the outer diameter shape of the stator core main body of the stator core of the rotating electrical machine is formed in a polygonal shape, the number of corners is an even number equal to or greater than 4, and the lengths of the respective diagonal sides are asymmetric, so that even in the case of an even-numbered angular structure, when vibration generated by electromagnetic force acting on the inner diameter of the stator core is transmitted to the outer diameter of the stator core, the electromagnetic mode is cancelled by the eigen mode, and vibration and noise of the entire rotating electrical machine can be reduced.
In the case of the invention according to claim 2, the stator core is provided with at least 2 mounting seats for mounting the stator core body to a mounting place, so that the lengths of the respective diagonal sides are asymmetrical, and when vibration generated by electromagnetic force acting on the inner diameter of the stator core is transmitted to the outer diameter of the stator core as in the case of the above-described aspect 1, the electromagnetic mode is cancelled by the natural mode, and vibration and noise of the entire rotating electrical machine can be reduced.
Further, since the mounting seat is provided to the stator core, not only stability is good, but also the natural frequency of the mounting system can be detuned.
Here, as a method of detuning the natural frequency, for example, the natural frequency can be changed by changing the distance from the mounting surface to the center of the stator core.
Further, by setting the mounting seat of the stator core to 4/3 times the center-to-center axial radius of the distance between the average outer diameter of the stator core and the tooth bottom of the stator core, the tangential displacement at the time of the elliptical mode deformation due to the electromagnetic force of the stator core is not generated at this position, and therefore, the vibration transmitted to the mounting portion of the stator core can be further suppressed.
In the invention according to claim 3, the stator core main body has an outer diameter of a polygonal shape with an odd number of angles of 3 or more, and ribs for supporting the stator core main body to a supporting place are attached to the sides which are flat surfaces, whereby the action of canceling the electromagnetic mode by the natural mode is further increased, and the vibration and noise of the rotating electrical machine can be further reduced.
Further, the rigidity of the entire stator can be increased by the support ribs of the stator core, and the rigidity of the stator core that can withstand electromagnetic force can be obtained, thereby making the entire rotating electric machine smaller and lighter.
In the invention according to claim 4, the outer diameter of the stator core main body is formed in a polygonal shape, the number of corners is an even number of 4 or more, and ribs for supporting the stator core main body to a supporting place are attached to the respective sides which become flat surfaces, so that the stator core main body not only has the same function as in the case of the invention according to claim 3, but also has the apex disposed at either one of the upper, lower, left and right sides in the case of an odd number of angles, so that the even number of angles is more advantageous for downsizing.
In the invention according to claim 5, the stator core is joined to the stator frame by the support rib, so that the stator core not only has the same function as in the case of claim 3, but also can be designed with a wider degree of freedom in the external shape of the rotating electric machine.
Further, since a space is formed between the stator core and the stator frame, cooling performance such as ventilation can be improved by the space. Thus, further downsizing and weight saving can be achieved.
In addition, since the temperature of the stator frame of the rotating electric machine can be reduced, it is possible to improve the environmental friendliness and to extend the life.
In the invention according to claim 6, the stator core is joined to the stator frame by the supporting ribs, so that not only the same effect as in the case of the above-described aspect 5 can be obtained, but also the electromagnetic mode can be cancelled by the eigen mode even if the ribs for supporting are disposed so as to be vertically and laterally symmetrical.
In addition, in the case of an odd number of angles, the vertex is disposed at either the upper, lower, left, or right sides, so that the case of an even number of angles is more advantageous for downsizing.
By integrating the supporting ribs with the stator core body, not only the same effects as in the cases of the above-described 3 rd and 4 th aspects can be obtained, but also the rigidity can be improved and the heat dissipation can be improved because of the absence of the joint portions.
In addition, by laminating the stator core main bodies in a skewed manner, the stator core or the tooth grooves of the stator core are skewed (twisted), and the electromagnetic force can be dispersed.
Further, the mounting height of the supporting rib mounted on the stator core to the stator frame is 4/3 times the radius of the middle shaft of the distance from the center of the stator core to the outer diameter and the distance to the bottom of the tooth groove of the stator core, and at this position, the tangential displacement at the time of the elliptical mode deformation due to the electromagnetic force of the stator core is not generated, so that the vibration transmitted to the mounting portion of the stator core can be further suppressed.
In the 7 th aspect of the present invention, the stator is constituted by the stator core according to any one of the 1 st, 3 rd and 4 th aspects, so that the rotating electric machine can be downsized and made highly rigid even with a large capacity, and the manufacturing system of the rotating electric machine can be realized by small-scale manufacturing and testing equipment, so that the manufacturing efficiency is high and the manufacturing can be performed at a low cost.
In addition, in the 8 th aspect of the present invention, the stator is the stator according to any one of the above 2 nd, 5 th, and 6 th aspects, so that the miniaturization and high rigidity of the rotating electric machine can be realized even with a large capacity, and the production system of the rotating electric machine can be realized by small-scale manufacturing and testing equipment, so that the manufacturing efficiency is high, and the manufacturing can be performed at a low cost.
Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out.
Drawings
Fig. 1A and 1B are a longitudinal sectional view and a circuit diagram showing one configuration example of a conventional induction motor.
Fig. 2A and 2B are diagrams for explaining a mechanism of noise generation.
Fig. 3 is a diagram for explaining a circular ring vibration mode.
Fig. 4A and 4B are diagrams for explaining the electromagnetic mode.
Fig. 5A and 5B are diagrams for explaining a structure of generating vibration from a relationship of an electromagnetic force and a natural mode.
Fig. 6 is a perspective view showing an entire configuration example of a stator core of a rotating electric machine according to embodiment 1 of the present invention.
Fig. 7A and 7B are perspective views showing an entire configuration example of a stator of a rotating electric machine according to embodiment 2 of the present invention.
Fig. 8 is a perspective view showing an entire configuration example of a stator of a rotating electric machine according to embodiment 3 of the present invention.
Fig. 9A and 9B are a front view and a side view showing an entire configuration example of a stator core of a rotating electric machine according to embodiment 4 of the present invention.
Fig. 10A and 10B are a front view and a side view showing an entire configuration example of a stator core of a rotating electric machine according to embodiment 5 of the present invention.
Fig. 11 is a front view showing an example of the entire configuration of a stator of a rotating electric machine according to embodiment 6 of the present invention.
Fig. 12 is a front view showing an example of the entire configuration of a stator of a rotating electric machine according to embodiment 7 of the present invention.
Fig. 13 is a front view showing an example of the entire configuration of a stator core of a rotating electric machine according to embodiment 8 of the present invention.
Fig. 14 is a front view showing an example of the entire configuration of a stator core of a rotating electric machine according to embodiment 9 of the present invention.
Fig. 15A and 15B are a front view and a side view showing an entire configuration example of a stator core of a rotating electric machine according to embodiment 10 of the present invention.
Fig. 16A and 16B are a front view and a side view showing an entire configuration example of a stator core of a rotating electric machine according to embodiment 11 of the present invention.
Fig. 17 is a front view showing an example of the entire configuration of a stator of a rotating electric machine according to embodiment 12 of the present invention.
Fig. 18 is a front view showing an example of the entire configuration of a stator core of a rotating electric machine according to embodiment 13 of the present invention.
Detailed Description
First, a noise generation mechanism which is a premise of the concept of the present invention will be described.
Fig. 2A and 2B are diagrams for explaining a mechanism of occurrence of vibration and noise.
As shown in fig. 2A and 2B, when the frequency of the electromagnetic force acting on the air gap between the rotor core and the stator core and the natural frequency of the stator core vibrate together, the stator frame vibrates sharply, and the vibration is dispersed into the air to generate noise.
The deformation mode of the stator frame generated by the electromagnetic force is generally an ellipse (n is 2) of a circular ring vibration mode. The magnetomotive force distribution of the stator core may generate a vibration mode as shown by a thick line in the figure. When the vibration mode of the stator core is rotated during operation of the rotating electric machine and transmitted to the stator frame, the stator frame repeats tension and compression. As a result, strain is generated in the stator frame, or vibration of the entire rotating electric machine is caused.
The circular ring oscillation mode is a mode in which the outer diameter is deformed in the radial direction as shown in fig. 3, and is represented by expansion and contraction (mode n is 0), merge (mode n is 1), ellipse (mode n is 2), triangle (mode n is 3), quadrangle (mode n is 4), pentagon (mode n is 5), and the like.
In the past, the stator frame of the motor has in most cases been left-right symmetrical.
Therefore, the deformation vibration generated in the ellipse (mode n is 2) of the stator core is easily transmitted to the stator frame, and when the electromagnetic force resonates with the stator core, large vibration and noise are generated.
Therefore, in order to reduce vibration and noise in such a motor, it is necessary to make it difficult for deformation of an ellipse (mode n is 2) generated by ring vibration of the stator core to be transmitted to the stator frame.
For example, by making the stator frame have a structure that is difficult to deform into an ellipse, the outer diameter vibration is made less likely to occur, and vibration and noise can be reduced.
The principle of noise generation will be specifically described below.
Since the electromagnetic force is a rotating magnetic field, when viewed from a certain position of the stator core, as shown in fig. 4A and 4B, a pattern in which n is 2 (ellipse) n is 4 (quadrangle) is generated as a forced vibration in the inner diameter of the stator core.
The mode of the electromagnetic force can be represented by formula (1) when it is represented by formula (a).
fM＝A·cos(ωt-Mθ) ...(1)
Wherein f isM: electromagnetic force, A: amplitude of electromagnetic force, ω: angular vibration frequency of electromagnetic force, M: electromagnetic force mode number, θ: mechanical angle, t: time.
On the other hand, the natural vibration mode of the stator core
When only the in-plane vibration of the circular ring is considered, it is represented by equation (2).
Wherein,
: natural vibration mode of the ring, phiN: amplitude of natural vibration mode, N: number of natural vibration modes, α: phase.
Therefore, the formula (3) can be expressed by the above formulas (1) and (2) assuming that the vibration amplitude of the ring generated by the electromagnetic force acting on the motor is z.
Since this is vibration at a certain angle θ, the vibration amplitude Z of the entire ring can be obtained from equation (4) by integrating the ring over the entire circumference with respect to θ.
Specifically, when a specific numerical value is used for the description, the generated vibration Z of the natural vibration mode N-2 and the electromagnetic force mode M-2 can be obtained from a vector product as shown in fig. 5A.
Here, the radially outward vector is positive and the inward vector is negative.
For the number of points calculated, in an exemplary calculation, a representative 8 points is calculated.
The value of the vector product is the occurrence of vibration with Z ═ 4.
The vibration Z in which the electromagnetic force mode M is 2 and the natural vibration mode N is 3 can be obtained from a vector product as shown in fig. 5B.
In the combination of the electromagnetic force mode M being 2 and the natural vibration mode N being 3, Z being 0, no vibration occurs.
That is, the above-described relationship indicates that the eigen-vibration mode and the electromagnetic force mode do not match each other, and that no vibration or noise is generated.
In general, the amount of deformation of the stator core in deformation is 1/(mode number)3And is proportionally smaller, the larger the number of modes, the lower the vibration.
That is, since the forced mode formed by the electromagnetic force is M2 (ellipse), by setting the outer diameter shape of the stator core to the circular ring vibration mode n to 3, 5, and 7, the vibrations can be cancelled out, the modes can be made non-uniform, and the noise of the vibrations can be reduced.
As a method thereof, the shape of the stator core is made asymmetric.
Since the ring vibration pattern M in which the vibration assist force pattern M of the electromagnetic vibration assist force induced in the stator core is an even number is 2, 4, 6, and 8, the pattern can be made to be different by making the outer diameter shape of the stator core the ring vibration pattern n 3, 5, and 7.
Such a method can also be realized by making the shape of the stator core asymmetric.
Next, an embodiment of the present invention based on the idea described above will be described with reference to the drawings.
Fig. 6 is a perspective view showing an entire configuration example of a stator core of the rotating electric machine of the present embodiment.
Since the entire structure of the rotating electric machine is the same as that of the conventional art in fig. 1, the same reference numerals are used for the same portions, and the description thereof is omitted.
That is, as shown in fig. 6, in the stator core 10 of the rotating electric machine according to the present embodiment, the outer diameter shape of the stator core 10 main body is formed in a polygonal shape, the number of corners is an even number of 4 or more, and the lengths of L1 and L2 in the present example, which are the diagonal sides, are asymmetric.
In the stator core of the rotating electrical machine of the present embodiment configured as described above, the outer diameter shape of the stator core 10 main body is formed in a polygonal shape, the number of corners is an even number of 4 or more, and the lengths of L1 and L2 in the present example, which are the diagonal sides, are asymmetric, so that even in the case of a structure having an even number of corners, when electromagnetic force vibration acting on the inner diameter of the stator core 10 is transmitted to the outer diameter of the stator core 10, the electromagnetic mode is cancelled by the eigen mode, and vibration and noise of the entire rotating electrical machine can be reduced.
As described above, in the stator core of the rotating electric machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electric machine is suppressed, and vibration and noise can be sufficiently and effectively reduced.
(embodiment 2)
Fig. 7A is a perspective view showing an example of the overall configuration of the stator of the rotating electric machine according to the present embodiment, and the same reference numerals are used for the same portions as those in fig. 1, and the description thereof is omitted, and only different portions will be described here.
That is, as shown in fig. 7A, the stator of the rotating electric machine according to the present embodiment is provided with at least 2 mounting seats 12 for mounting the stator core 11 body to a mounting place on the stator core 11 of the rotating electric machine having the configuration of embodiment 1 shown in fig. 1.
The mounting seat 12 may be an outer peripheral side of the stator core 11.
In the stator of the rotating electric machine of the present embodiment configured as above, by providing at least 2 mounting seats 12 for mounting the stator core 11 main body to a mounting place on the stator core 11, the sides that are diagonal to each other, for example, L1 and L2, are made asymmetrical, and as in the case of embodiment 1 described above, when vibration generated by electromagnetic force acting on the inner diameter of the stator core 11 is transmitted to the outer diameter of the stator core 11, the electromagnetic mode is cancelled by the eigen mode, and vibration and noise of the entire rotating electric machine can be reduced.
That is, according to the vibration mode of fig. 7B, the natural frequency is represented by the following expression (f 2).
Wherein, E: young's modulus, I: second moment of area, Le: distance from the mounting surface to the center of gravity, K: and (4) quality.
In order to change the natural frequency, the distance from the mounting surface of the stator core 11 to the center of gravity may be changed.
As described above, as in the case of embodiment 1, when vibration generated by electromagnetic force acting on the inner diameter of the stator core 11 is transmitted to the outer diameter of the stator core 11, the electromagnetic mode is cancelled by the natural mode, and vibration and noise of the entire rotating electric machine can be reduced.
Further, by providing the mounting base 12 on the stator core 11, not only stability is improved, but also the natural frequency of the mounting system can be detuned.
As a method of detuning the natural frequency, the natural frequency can be changed by changing, for example, the distance from the mounting surface to the center of the stator core.
As described above, in the stator of the rotating electric machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electric machine is suppressed, and vibration and noise can be sufficiently and effectively reduced.
In addition, the vibration damping device not only has good stability, but also can detune the natural vibration frequency of the mounting system.
(embodiment 3)
Fig. 8 is a perspective view showing an example of the overall configuration of the stator of the rotating electric machine according to the present embodiment, and the same reference numerals are used for the same portions as those in fig. 7, and the description thereof is omitted, and only different portions will be described here.
That is, as shown in fig. 8, in the stator of the rotary electric machine according to the present embodiment, in the stator of the rotary electric machine having the configuration of the 2 nd embodiment shown in fig. 7, the mounting seat 12 of the stator core 11 is positioned at 4/3 times the center axial radius of the distance R1 between the average outer diameter R2 of the stator core 11 and the tooth bottom of the stator core 11 from the center of the stator core 11 (that is, the center axial radius is 1/2 of the sum of the average outer diameter R2 of the stator core 11 and the distance R1 from the center of the stator core 11 to the tooth bottom of the stator core 11).
In the stator of the rotating electric machine according to the present embodiment configured as described above, the position of the mount 12 of the stator core 11 is 4/3 times the center-to-center axial radius of the distance R1 between the average outer diameter R2 of the stator core 11 and the bottom of the tooth space of the stator core 11, and thus, the tangential displacement during the deformation in the elliptical mode due to the electromagnetic force of the stator core 11 is not generated at this position, and therefore, the vibration transmitted to the mount of the stator core 11 can be further suppressed.
As described above, in the stator of the rotating electric machine of the present embodiment, the vibration due to the electromagnetic force generated when the rotating electric machine is operated can be further suppressed, and the vibration and noise can be further effectively reduced.
(embodiment 4)
Fig. 9A and 9B are a front view and a side view showing an entire configuration example of a stator core of a rotating electric machine of the present embodiment.
Since the entire structure of the rotating electric machine is the same as that of the conventional art in fig. 1, the same reference numerals are used for the same portions, and the description thereof is omitted.
That is, as shown in fig. 9A and 9B, the outer diameter of the stator core 13 main body of the rotating electric machine according to the present embodiment is polygonal, the number of corners thereof is an odd number of 3 or more, and the ribs 14 for supporting the stator core 13 main body to the supporting place are attached to the sides that become the flat surfaces by, for example, welding or the like.
In the stator core of the rotating electrical machine of the present embodiment configured as described above, the outer diameter of the stator core 13 main body is polygonal, the number of corners thereof is an odd number of 3 or more, and the ribs 14 for supporting the stator core 13 main body to the supporting place are attached to the sides that become flat surfaces, whereby the action of the natural mode canceling electromagnetic mode is further increased, and the vibration and noise of the rotating electrical machine can be further reduced.
Further, the support ribs 14 of the stator core 13 can increase the rigidity of the entire stator, and the rigidity of the stator core 13 that can withstand electromagnetic force is obtained, thereby making the entire rotating electric machine smaller and lighter.
As described above, in the stator core of the rotating electrical machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electrical machine can be suppressed, and vibration and noise can be reduced more effectively.
In addition, the entire rotating electric machine can be made smaller and lighter.
(embodiment 5)
Fig. 10A and 10B are a front view and a side view showing an entire configuration example of a stator core of a rotating electric machine of the present embodiment.
Since the entire structure of the rotating electric machine is the same as that of the conventional art in fig. 1, the same reference numerals are used for the same portions, and the description thereof is omitted.
That is, as shown in fig. 10A and 10B, the outer diameter of the stator core 15 main body of the rotating electric machine according to the present embodiment is polygonal, the number of corners thereof is an even number of 4 or more, and ribs 16 for supporting the stator core 15 main body to a supporting place are attached to the respective sides which become flat surfaces by, for example, welding or the like.
In the stator core of the rotating electric machine of the present embodiment configured as described above, the outer diameter of the stator core 15 main body is polygonal, the number of corners is an even number of 4 or more, and the ribs 16 for supporting the stator core 15 main body to the supporting place are attached to the respective sides that become flat surfaces, so that the stator core has the same function as in the case of the above-described embodiment 4, and the apex is disposed at either one of the upper, lower, left, and right sides in the case of the odd number of angles, so that the even number of angles is particularly advantageous for downsizing.
As described above, in the stator core of the rotating electrical machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electrical machine can be suppressed, and vibration and noise can be reduced more effectively.
In addition, the entire rotating electric machine can be made smaller and lighter.
(embodiment 6)
Fig. 11 is a front view showing an overall configuration example of a stator of a rotating electric machine according to the present embodiment, and the same portions as those in fig. 9 are denoted by the same reference numerals, and description thereof is omitted, and only different portions will be described here.
That is, as shown in fig. 11, in the stator of the rotating electric machine according to the present embodiment, the stator core 13 of the rotating electric machine having the configuration according to embodiment 4 shown in fig. 9 is joined to the stator frame 17 by the supporting ribs 14.
In the stator of the rotating electric machine of the present embodiment configured as described above, the stator core 13 is joined to the stator frame 17 by the supporting ribs 14, so that not only the same function as in the case of embodiment 4 described above can be obtained, but also the degree of freedom in designing the external shape of the rotating electric machine can be increased.
Further, since a space is formed between the stator core 13 and the stator frame 17, cooling performance such as ventilation can be improved by the space. Thus, the entire rotating electric machine can be further reduced in size and weight.
In addition, since the temperature of the stator frame of the rotating electric machine can be reduced, it is possible to improve the environmental friendliness and to extend the life.
As described above, in the stator of the rotating electric machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electric machine is suppressed, and vibration and noise can be reduced more effectively.
In addition, the degree of freedom in designing the external shape of the rotating electric machine can be increased.
In addition, the entire rotating electric machine can be made smaller and lighter.
In addition, the safety can be improved, the environmental friendliness can be improved, and the life can be prolonged.
(7 th embodiment)
Fig. 12 is a front view showing an overall configuration example of a stator of a rotating electric machine according to the present embodiment, and the same portions as those in fig. 10 are denoted by the same reference numerals, and description thereof is omitted, and only different portions will be described here.
That is, as shown in fig. 12, in the stator of the rotating electric machine according to the present embodiment, the stator core 15 of the rotating electric machine having the configuration according to embodiment 5 shown in fig. 10 is joined to the stator frame 17 by the supporting ribs 16.
In the stator of the rotating electric machine according to the present embodiment configured as described above, the stator core 15 is joined to the stator frame 17 by the supporting ribs 16, so that not only the same effects as those in the case of embodiment 6 described above can be obtained, but also the electromagnetic mode can be cancelled by the eigen mode even if the supporting ribs 16 are disposed so as to be vertically and horizontally symmetrical.
In addition, in the case of the odd-numbered polygon, the vertex is disposed at either the upper, lower, left, or right sides, and therefore, the even-numbered polygon is particularly advantageous for downsizing.
As described above, in the stator of the rotating electric machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electric machine is suppressed, and vibration and noise can be reduced more effectively.
In addition, the degree of freedom in designing the external shape of the rotating electric machine can be increased.
In addition, the entire rotating electric machine can be further reduced in size and weight.
In addition, the safety can be improved, the environmental friendliness can be improved, and the life can be prolonged.
(8 th embodiment)
Fig. 13 is a front view showing an example of the overall configuration of a stator core of a rotating electric machine according to the present embodiment, and the same portions as those in fig. 9 are denoted by the same reference numerals, and the description thereof is omitted, and only different portions will be described here.
That is, as shown in fig. 13, in the stator core of the rotating electric machine according to the present embodiment, the supporting rib 14 and the stator core 18 main body are integrated with each other in the stator core of the rotating electric machine having the configuration as shown in the 4 th embodiment shown in fig. 9.
In the stator core of the rotating electric machine of the present embodiment configured as described above, not only the same function as that of the above embodiment 4 can be obtained by integrating the supporting ribs 14 and the stator core 18 main body, but also the heat radiation performance can be improved because the rigidity is improved and the joint portion is not present, as compared with the case where the ribs 14 are separately integrated.
Thus, vibration and noise can be further reduced and the size can be reduced.
Further, since the support rib 14 is not attached by welding or the like, the cause of deterioration in performance such as welding strain can be suppressed.
As described above, in the stator core of the rotating electrical machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electrical machine can be suppressed, and vibration and noise can be reduced more effectively.
In addition, the entire rotating electric machine can be further reduced in size and weight.
In addition, heat dissipation can be improved.
In addition, the cause of deterioration in performance such as weld strain can be suppressed.
(9 th embodiment)
Fig. 14 is a front view showing an example of the overall configuration of a stator core of a rotating electric machine according to the present embodiment, and the same reference numerals are used for the same portions as those in fig. 10, and the description thereof will be omitted, and only different portions will be described here.
That is, as shown in fig. 14, in the stator core of the rotating electric machine according to the present embodiment, the supporting rib 16 and the stator core 19 main body are integrated with each other in the stator core of the rotating electric machine having the configuration of the 5 th embodiment shown in fig. 10.
In the stator core of the rotating electric machine of the present embodiment configured as described above, not only the same function as that of the above-described embodiment 5 can be obtained by integrating the supporting ribs 16 and the stator core 19 main body, but also the heat radiation property can be improved because the rigidity is improved and the joint portion is not present, as compared with the case where the ribs 16 are separately integrated.
Thus, vibration and noise can be further reduced and the size can be reduced.
Further, since the support rib 16 is not attached by welding or the like, the cause of deterioration in performance such as welding strain can be suppressed.
As described above, in the stator core of the rotating electrical machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electrical machine can be suppressed, and vibration and noise can be reduced more effectively.
In addition, the entire rotating electric machine can be further reduced in size and weight.
In addition, heat dissipation can be improved.
In addition, the cause of deterioration in performance such as weld strain can be suppressed.
(10 th embodiment)
Fig. 15A and 15B are a front view and a side view showing an overall configuration example of a stator core of a rotating electric machine according to the present embodiment, and the same portions as those in fig. 13 are denoted by the same reference numerals, and description thereof is omitted.
That is, as shown in fig. 15A and 15B, in the stator core of the rotating electric machine according to the present embodiment, the stator core 18 main body is laminated in a skewed manner in the stator core of the rotating electric machine having the configuration as in embodiment 8 shown in fig. 13.
In the stator core of the rotating electric machine of the present embodiment configured as described above, not only the same action as that in the case of embodiment 8 described above can be obtained by laminating the stator core 18 main bodies in a skewed manner, but also the electromagnetic force can be dispersed by skewing (twisting) the slots of the stator core 18 or the stator core 18.
Thus, not only can vibration and noise be further reduced, but also torque fluctuation and the like during the operation of the rotating electric machine can be reduced, and the electrical characteristics of the rotating electric machine can be improved.
As described above, in the stator core of the rotating electrical machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electrical machine can be suppressed, and vibration and noise can be reduced more effectively.
In addition, the entire rotating electric machine can be further reduced in size and weight.
In addition, heat dissipation can be improved.
In addition, the cause of deterioration in performance such as weld strain can be suppressed.
In addition, the torque fluctuation in the running process of the rotating electric machine can be reduced, and the electrical characteristics of the rotating electric machine are improved.
(embodiment 11)
Fig. 16A and 16B are a front view and a side view showing an example of the overall configuration of a stator core of a rotating electric machine according to the present embodiment, and the same portions as those in fig. 14 are denoted by the same reference numerals, and description thereof is omitted.
That is, as shown in fig. 16A and 16B, in the stator core of the rotating electric machine according to the present embodiment, the stator core 19 main body is laminated in a skewed manner in the stator core of the rotating electric machine having the configuration as in the 9 th embodiment shown in fig. 14.
In the stator core of the rotating electric machine of the present embodiment configured as described above, not only the same action as that in the case of embodiment 9 described above can be obtained by laminating the stator core 19 main bodies in a skewed manner, but also the electromagnetic force can be dispersed by skewing (twisting) the slots of the stator core 19 or the stator core 19.
Thus, not only can vibration and noise be further reduced, but also torque fluctuation and the like during the operation of the rotating electric machine can be reduced, and the electrical characteristics of the rotating electric machine can be improved.
As described above, in the stator core of the rotating electrical machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electrical machine can be suppressed, and vibration and noise can be reduced more effectively.
In addition, the entire rotating electric machine can be further reduced in size and weight.
In addition, heat dissipation can be improved.
In addition, the cause of deterioration in performance such as weld strain can be suppressed.
In addition, the torque fluctuation in the running process of the rotating electric machine can be reduced, and the electrical characteristics of the rotating electric machine are improved.
(embodiment 12)
Fig. 17 is a front view showing an example of the overall configuration of the stator of the rotating electric machine according to the present embodiment, and the same reference numerals are used for the same portions as those in fig. 11 or 12, and the description thereof is omitted, and only different portions will be described here.
That is, as shown in fig. 17, in the stator of the rotary electric machine according to the present embodiment, in the stator of the rotary electric machine having the configuration of the 6 th or 7 th embodiment shown in fig. 11 or 12, the mounting height of the supporting rib 14 or 16 mounted to the stator core 13 or 15 to the stator frame 17 is set to 4/3 times the middle axis radius of the distance R2 from the center of the stator core 13 or 15 to the outer diameter and the distance R1 from the center of the stator core 13 or 15 to the slot bottom of the stator core 13 or 15 (the middle axis is the axis of 1/2 whose center is the center of the stator core 13 or 15 and whose radius is the sum of the distance R2 from the center of the stator core 13 or 15 to the outer diameter and the distance R1 from the center of the stator core 13 or 15 to the slot bottom of the stator core 13 or 15, that is, that the radius of the middle axis is (R1+ R2)/2).
In the stator of the rotating electric machine according to the present embodiment configured as described above, the mounting height of the supporting ribs 14 or 16 mounted on the stator core 13 or 15 to the stator frame 17 is set to 4/3 times the center axis radius of the distance R2 from the center to the outer diameter of the stator core 13 or 15 and the distance R1 from the bottom of the tooth groove of the stator core 13 or 15, and thus, in this position, since the tangential displacement at the time of the deformation of the elliptical mode due to the electromagnetic force of the stator core 13 or 15 is not generated, the vibration transmitted to the mounting portion of the stator core 13 or 15 can be further suppressed.
As described above, in the stator of the rotating electric machine of the present embodiment, the vibration due to the electromagnetic force generated when the rotating electric machine is operated can be further suppressed, and the vibration and noise can be further effectively reduced.
(embodiment 13)
Fig. 18 is a front view showing an example of the overall configuration of a stator core of a rotating electric machine according to the present embodiment, and the same reference numerals are used for the same portions as those in fig. 13, and the description thereof will be omitted, and only different portions will be described here.
That is, as shown in fig. 18, in the stator of the rotating electric machine according to the present embodiment, in the stator core of the rotating electric machine having the configuration of the 8 th embodiment shown in fig. 13, the height of the support rib 14 attached to the stator core 18 attached to the stator frame 17 is 4/3 times the center axis radius of the distance R2 from the center to the outer diameter of the stator core 18 and the distance R1 from the bottom of the tooth groove of the stator core 18.
In the stator core of the rotating electrical machine according to the present embodiment configured as described above, the mounting height of the supporting ribs 14 mounted on the stator core 18 to the stator frame 17 is set to 4/3 times the center-to-center axial radius of the distance R2 from the center to the outer diameter of the stator core 18 and the distance R1 from the bottom of the tooth groove of the stator core 18, and thus, in this position, the tangential displacement at the time of the elliptical mode deformation due to the electromagnetic force of the stator core 18 is not generated, and therefore, the vibration transmitted to the mounting portion of the stator core 18 can be further suppressed.
As described above, in the stator of the rotating electric machine according to the present embodiment, vibration due to electromagnetic force generated during operation of the rotating electric machine can be suppressed, and vibration and noise can be further effectively reduced.
In the present embodiment, the same application can be made to the stator core of the rotating electric machine having the configuration of embodiment 9 shown in fig. 9, and the same reduction effect as in the above case can be obtained.
(embodiment 14)
In the present embodiment, in a rotating electrical machine having a stator 1 and a rotor 4, the stator 1 is constituted by the stator core of any one of the above-described 1 st, 4 th, 5 th, 8 th, 9 th, 11 th, and 13 th embodiments.
Thus, the rotating electric machine can be miniaturized and made highly rigid even with a large capacity, and the production system can be realized by small-scale manufacturing and testing equipment, so that the manufacturing efficiency is high and the manufacturing can be performed at a low cost.
(embodiment 15)
In the present embodiment, a rotary electric machine including a stator 1 and a rotor 4 is configured such that the stator of any one of the embodiments 2, 3, 6, 7, and 12 is used as the stator 1.
Thus, the rotating electric machine can be miniaturized and made highly rigid even with a large capacity, and the production system can be realized by small-scale manufacturing and testing equipment, so that the manufacturing efficiency is high and the manufacturing can be performed at a low cost.
(modification example)
The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage within a range not departing from the gist thereof.
For example, the present invention is not limited to the use in motors for general industrial use, lifting equipment, and the like, and can be applied to other rotating electric machines such as a generator, a synchronous machine, and the like in the same manner as described above, and similar operational effects can be obtained.
In addition, the embodiments may be combined as appropriate when possible, and in this case, the combined action and effect can be obtained.
In the embodiments described above, inventions including various stages are provided, and a plurality of inventions can be obtained by appropriately combining a plurality of disclosed components.
For example, even if some components are omitted from all the components disclosed in the embodiments, the problem (at least 1) described in the paragraph relating to the problem to be solved by the present invention can be solved, and if the effect (at least 1) described in the paragraph relating to the effect of the invention can be obtained, the configuration in which the components are omitted can be regarded as the invention.
As described above, according to the stator core and the stator of the rotating electric machine of the present invention, the stator core itself is hardly deformed, and the deformation in the elliptical pattern is hardly generated in the stator frame, and the vibration due to the electromagnetic force generated when the rotating electric machine is operated can be suppressed, and the effect of sufficiently reducing the vibration and the noise can be obtained.
In addition, according to the stator core and the stator of the rotating electric machine of the present invention, the cooling performance such as ventilation can be improved by using the space between the stator core and the stator frame.
Thus, further downsizing and weight saving can be achieved.
In addition, since the temperature of the stator frame of the rotating electric machine can be reduced, it is possible to improve the environmental friendliness and to extend the life.
Further, by providing the stator core with the mounting seat and changing the mounting height, the natural frequency of the stator core can be detuned from the mounting system.
In addition, according to the rotating electric machine of the present invention, miniaturization and high rigidity of the rotating electric machine can be realized even with a large capacity, and a production system can be realized by small-scale manufacturing and test equipment, so that the manufacturing efficiency is high and the manufacturing can be performed at low cost.
Other advantages and variations will be apparent to those skilled in the art. The invention in its broader aspects is therefore not limited to the specific details and representative embodiments shown and described herein. Many modifications may be made without departing from the spirit or scope of the general inventive concept.
Claims (2)
1. A stator of a rotating electric machine, characterized in that: the stator core body has a polygonal outer diameter, the number of corners is an odd number of 3 or more, and ribs for supporting the stator core body to a supporting place are attached to the sides which are flat,
the stator core is jointed with a stator frame (17) through the supporting ribs,
the mounting height of the supporting ribs and the stator frame (17) is 4/3 times of the middle shaft radius of the distance from the center of the stator core to the outer diameter and the distance from the center of the stator core to the tooth bottom of the stator core.
2. A stator of a rotating electric machine, characterized in that: the stator core body has a polygonal outer diameter, the number of corners is an even number of 4 or more, and ribs for supporting the stator core body to a supporting place are attached to the sides which are flat,
the stator core is jointed with a stator frame (17) through the supporting ribs,
the mounting height of the supporting ribs and the stator frame (17) is 4/3 times of the middle shaft radius of the distance from the center of the stator core to the outer diameter and the distance from the center of the stator core to the tooth bottom of the stator core.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001280708A JP2003088008A (en) | 2001-09-14 | 2001-09-14 | Stator core of rotating electric machine, stator, and rotating electric machine using them |
| JP280708/2001 | 2001-09-14 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021431531A Division CN1322654C (en) | 2001-09-14 | 2002-09-13 | Stator iron core of rotating electric machine and stator thereof, and rotating electric machine using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1967969A CN1967969A (en) | 2007-05-23 |
| CN100514792C true CN100514792C (en) | 2009-07-15 |
Family
ID=19104654
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510004709XA Expired - Lifetime CN1326309C (en) | 2001-09-14 | 2002-09-13 | Stator iron core of rotating electric machine and rotating electric machine using same |
| CNB021431531A Expired - Lifetime CN1322654C (en) | 2001-09-14 | 2002-09-13 | Stator iron core of rotating electric machine and stator thereof, and rotating electric machine using same |
| CNB2006101446000A Expired - Lifetime CN100514792C (en) | 2001-09-14 | 2002-09-13 | Stator of rotating electric machine |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510004709XA Expired - Lifetime CN1326309C (en) | 2001-09-14 | 2002-09-13 | Stator iron core of rotating electric machine and rotating electric machine using same |
| CNB021431531A Expired - Lifetime CN1322654C (en) | 2001-09-14 | 2002-09-13 | Stator iron core of rotating electric machine and stator thereof, and rotating electric machine using same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2003088008A (en) |
| CN (3) | CN1326309C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5651371B2 (en) | 2010-04-30 | 2015-01-14 | 株式会社東芝 | Rotating electric machine |
| CN104638814B (en) * | 2013-11-13 | 2018-04-17 | Abb技术有限公司 | A kind of rotating device |
| JP6766026B2 (en) * | 2017-11-21 | 2020-10-07 | 三菱重工業株式会社 | Electric compressor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4284920A (en) * | 1979-08-10 | 1981-08-18 | General Electric Co. | Dynamoelectric machine stator assembly |
| US5783892A (en) * | 1995-06-26 | 1998-07-21 | Kabushiki Kaisha Toshiba | Stator for dynamoelectric machines |
| CN1290985A (en) * | 1999-09-30 | 2001-04-11 | 电盛兰达株式会社 | Stator iron core and motor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644361A (en) * | 1979-09-17 | 1981-04-23 | Hitachi Ltd | Rotary electric machine |
| JP2721061B2 (en) * | 1991-11-14 | 1998-03-04 | ファナック株式会社 | Synchronous motor that can reduce cogging torque |
| JP4052719B2 (en) * | 1998-03-05 | 2008-02-27 | 日本電産シバウラ株式会社 | Single phase induction motor |
| JP2001045683A (en) * | 1999-07-29 | 2001-02-16 | Fujitsu General Ltd | Motor |
-
2001
- 2001-09-14 JP JP2001280708A patent/JP2003088008A/en active Pending
-
2002
- 2002-09-13 CN CNB200510004709XA patent/CN1326309C/en not_active Expired - Lifetime
- 2002-09-13 CN CNB021431531A patent/CN1322654C/en not_active Expired - Lifetime
- 2002-09-13 CN CNB2006101446000A patent/CN100514792C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4284920A (en) * | 1979-08-10 | 1981-08-18 | General Electric Co. | Dynamoelectric machine stator assembly |
| US5783892A (en) * | 1995-06-26 | 1998-07-21 | Kabushiki Kaisha Toshiba | Stator for dynamoelectric machines |
| CN1290985A (en) * | 1999-09-30 | 2001-04-11 | 电盛兰达株式会社 | Stator iron core and motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1405946A (en) | 2003-03-26 |
| CN1967969A (en) | 2007-05-23 |
| CN1326309C (en) | 2007-07-11 |
| JP2003088008A (en) | 2003-03-20 |
| CN1652431A (en) | 2005-08-10 |
| CN1322654C (en) | 2007-06-20 |
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