JPH09289745A - Magnetic pole laminate of rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the strength of transition sections, and to prevent deformation and breaking while reducing leakage flux, by installing work hardening sections by compressive deformation among magnetic poles in each laminated plate consisting of disks or ring-shapes having a fixed number of the magnetic poles on circumferences or the narrow-width transition sections tying the magnetic poles and other laminated plate sections. SOLUTION: Work hardening sections 53, to which compressive deformation treatment is executed, are mounted on parts of the transition sections 27 of each laminated plate 51 constituting the pole laminate of a rotor interposed in a stator for a rotating machine. Since the work hardening sections 53 are kept within a range in the circumferential direction B centering around the shoulder section corner of an opening section 25 for a magnet, the wall thickness t1 is made thinner than those T1 of other sections of the laminated plates 51, and air gaps 55 are generated among each laminated plate 51. Accordingly, strength against external force in the work hardening sections 53 is increased while reluctance is elevated, the strength of the transition sections 27 is ensured and deformation and breaking are prevented, and leakage flux is redeuced and the performance of the rotating machine can be improved. The same treatment can also be conducted in the stator for the rotating machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic pole laminate for a rotating machine, and more particularly to a magnetic pole laminate for a rotating machine used for a rotor or a stator and formed by laminating laminated plates.

[0002]

2. Description of the Related Art Conventionally, a magnetic pole laminated body formed by laminating laminated plates is used for a stator or a rotor of a rotating machine (motor or generator). As the laminated plate, for example, a steel plate made of a high magnetic permeability material is used. This laminated structure suppresses the eddy current loss to a low level. Hereinafter, as a conventional technique, a motor including a stator and a rotor having such a laminated structure will be described.

"Prior Art 1" FIG. 4 is a cross-sectional view showing the structure of a conventionally used motor. This motor is an inner magnet type permanent magnet motor including a stator 1 and a rotor 3 inserted in the stator 1 and having a permanent magnet in the rotor 3.

The stator body 5 of the stator 1 has a plate thickness of 0.
A ring-shaped stator laminated plate 7 of about 5 mm is laminated to form a tubular shape. Six salient poles 9 are provided on the stator body 5 so as to project to the inner peripheral side. 6
The individual salient poles 9 are provided at equal intervals and are integrally formed on the stator body 5. The inner peripheral surface of each salient pole 9 is a cylindrical surface, and is set so as to face the outer peripheral surface of the rotor 3 with a constant gap. A stator coil is formed by winding a stator winding 11 around each salient pole 9 as shown in the figure.

The rotor body 13 of the rotor 3 has a plate thickness of 0.5.
The rotor laminated plates 15 having a ring shape of about millimeter are laminated to form a cylindrical shape. A rotary shaft 17 is fixed to the center of the rotor body 13, and the rotary shaft 17 is pivotally supported by a motor case (not shown). In addition, in the vicinity of the outer peripheral surface of the rotor main body 13, there are two locations (180
The rotor magnet 19 is fixed at a position where the phase is shifted. Then, the rotor magnet 19 in the rotor body 13
A portion on the outer peripheral side of the magnetic pole is the magnetic pole 21. That is, the magnetic flux generated in the rotor magnet 19 enters and leaves the rotor 3 through the magnetic pole 21.

FIG. 5 is a plan view of the rotor laminated plate 15. At the center of the rotor laminated plate 15, a circular shaft mounting hole 23 for inserting the rotary shaft 17 is provided. Also,
A rectangular magnet opening 25 for inserting the rotor magnet 19 is provided near the outer peripheral surface of the rotor laminated plate 15. A magnetic pole 21a is provided on the outer peripheral side of the magnet opening 25.
The magnetic pole 21a is laminated to form the magnetic pole 21 of the rotor body 13 described above. Here, the opening 25 for the magnet
A narrow portion between the shoulder portion and the outer circumference of the rotor is referred to as a crossover portion 27. The transition portion 27 is a portion that connects the magnetic pole 21a and the other rotor laminated plate 15 portion.

The configuration of the conventional motor shown in FIG. 4 has been described above. When the motor is operating, a rotating magnetic field is generated by supplying an alternating current to the stator winding 11. On the other hand, in the rotor 3, a magnetic field is generated in the magnetic pole 21 by the rotor magnet 19. Due to the magnetic action of the rotating magnetic field of the stator 1 and the magnetic field of the rotor 3, a rotational force acts on the rotor 3 and the rotor 3 rotates.

"Prior Art 2" FIG. 6 is a cross-sectional view showing the structure of a motor according to the prior art 2. As shown in FIG. In this motor, the structure of the stator main body 33 in the stator 31 is different from that of the related art 1. The stator main body 33 has a split structure, and includes a stator outer cylinder 35 and a stator inner cylinder 37 fitted in the stator outer cylinder 35 without a gap.

The stator outer cylinder 35 is formed in a cylindrical shape by stacking ring-shaped stator outer cylinder laminated plates 39 having a plate thickness of about 0.5 mm. The stator inner cylinder 37 also has a plate thickness of 0.5.
A ring-shaped stator inner cylinder laminated plate 41 having a millimeter shape is laminated to form a cylindrical shape. In the stator inner cylinder 37,
Six convex poles 43 are provided at equal intervals in the circumferential direction. The adjacent convex poles 43 are connected on the inner peripheral side by the connecting portion 45. Inner peripheral surface of the stator inner cylinder 37 (that is, inner peripheral surface of the cylinder formed by the convex pole 43 and the connecting portion 45)
Is a cylindrical surface, and is set so as to face the outer peripheral surface of the rotor 3 with a constant gap. The outer peripheral surface of the stator inner cylinder 37 (that is, the outer surface of each salient pole 43) is also a cylindrical surface. The stator inner cylinder 37 is press-fitted into the stator outer cylinder 35, and the salient poles 43 are in close contact with the stator outer cylinder 35 without any gap. By eliminating the gap between the salient pole 43 and the stator outer cylinder 35, the magnetic flux can easily pass between them.

FIG. 7 is a plan view of the stator inner cylinder laminated plate 41. Six salient poles 43a are connected by a connecting portion 45a corresponding to the cross-sectional shape of the stator inner cylinder 37. The salient poles 43a and the connecting portions 45a are stacked to form the salient poles 43 and the connecting portions 45 of the stator inner cylinder 37 described above. The connecting portion 45a is a connecting portion that connects between the adjacent salient poles 43a.

In the case of the motor shown in FIG. 6, the stator winding 11 can be wound around the salient pole 43 before the stator inner cylinder 37 is fitted into the stator outer cylinder 35. Since the stator winding 11 is wound from the outside, the winding work is easier than the case of winding from the inside as in the case of the conventional technique 1. And
It is possible to increase the occupancy rate of the stator winding 11 in the space between the salient poles and increase the number of turns of the stator coil.

[0012]

[Problems to be Solved by the Invention]

"Problem with Prior Art 1" FIG. 8 shows details of the portion A indicated by a circle in FIG. The minimum width dimension in the radial direction of the transition portion 27 is W1 as shown.

FIG. 8 shows the rotor magnet 19 to the magnetic pole 21a.
The magnetic flux Φa passing through and reaching the salient pole 9 is indicated by an arrow. A part of the magnetic flux Φa does not reach the salient pole 9 and becomes a leakage magnetic flux Φb, which is leaked from the transition portion 27 to other portions of the rotor laminated plate 15. In order to efficiently pass the magnetic flux between the magnetic pole 21a and the convex pole 9 to improve the performance of the motor, it is preferable to reduce the leakage magnetic flux Φb as much as possible. Here, the opening 25 for the magnet
Are arranged closer to the outer peripheral side to narrow the width of the crossover portion 27 in the radial direction, whereby the leakage magnetic flux can be effectively reduced. That is, when the width of the crossover portion 27 in the radial direction W1 is narrowed, the magnetic resistance of the crossover portion 27 increases due to the reduction of the cross-sectional area, and thus the leakage magnetic flux Φb decreases.

On the other hand, when the rotor 3 rotates, a centrifugal force F acts on the rotor magnet 19 as shown in the figure. A bending moment acts on the transition portion 27 by the centrifugal force F. Therefore, to prevent cracks and fractures due to bending moment,
It is necessary to set the width of the transition portion 27 in the radial direction. Further, since the centrifugal force F increases in proportion to the square of the rotor rotation speed, the bending moment acting on the crossover portion 27 also increases according to the rotor rotation speed. Therefore, the maximum rotation speed of the motor is limited by the bending strength (that is, the width dimension) of the transition portion 27.

As described above, in the conventional motor, it is preferable to reduce the magnetic flux Φb even if the width of the crossover portion 27 is narrowed in the radial direction in order to improve the performance of the motor. It is difficult to reduce the width of the portion 27.

"Problem with Prior Art 2" FIG. 9 shows the details of the portion B indicated by a circle in FIG. Connection part 45
The minimum width dimension of a in the radial direction is W2 as shown.

In FIG. 9, the magnetic flux Φc from the convex pole 43a to the magnetic pole 21a is shown by an arrow. A part of the magnetic flux Φc does not reach the magnetic pole 21a and becomes a leakage magnetic flux Φd, which is the connecting portion 45.
Leaked in a. Also here, in order to efficiently pass the magnetic flux between the salient pole 43a and the magnetic pole 21a to improve the performance of the motor, the magnetic flux Φd is reduced as much as possible even if the width of the connecting portion 45a in the radial direction is narrowed. Is effective.

On the other hand, (1) at the time of manufacturing the motor, it is necessary to prevent the connecting portion 45 from cracking or breaking during handling of the stator inner cylinder 37. (2) Further, in order to improve the performance of the motor by reducing the gap between the stator 1 and the rotor 3,
The inner peripheral surface of the stator inner cylinder 37 may be finished by machining. In this case, it is necessary to prevent deformation of the connecting portion 45 during machining. (3) Furthermore, as mentioned above,
When the stator inner cylinder 37 is configured to be press-fitted into the stator outer cylinder 35, it is necessary to secure the annular rigidity of the stator inner cylinder 37 to prevent deformation. In addition, since a bending moment acts on the connecting portion 45 by press fitting, it is necessary to prevent cracks or breakage in the connecting portion 45 during press fitting. The radial width of the connecting portion 45a of each stator laminated plate 41 is (1) to
It is set wide to some extent to meet the requirement of (3).

As described above, in the motor of the prior art 2, in order to improve the performance of the motor, it is preferable to reduce the leakage magnetic flux Φd even if the width of the connecting portion 45a in the radial direction is narrowed. However, since it is necessary to prevent the connecting portion 45a from cracking or breaking and prevent the stator inner cylinder 37 from being deformed during press fitting, the connecting portion 4a
It is difficult to narrow the width of 5a.

"Object of the Invention" The present invention has been made to solve the above-mentioned problems, and is formed by laminating laminated plates, and magnetic poles are laminated so that magnetic poles are formed on the periphery of the laminated plates. Regarding the body An object of the present invention is to improve the strength of the crossover between the magnetic poles of each laminated plate, or the crossover of the magnetic poles and other magnetic pole laminated body portions against external force, and to increase the magnetic resistance of the crossover so as to prevent leakage of magnetic flux. It is to provide a magnetic pole laminated body capable of reducing The object of the present invention is to ensure both the strength of the crossover portion to prevent deformation and destruction and to improve the motor performance by reducing the leakage magnetic flux.

[0021]

DISCLOSURE OF THE INVENTION The present invention provides a magnetic pole laminate of a rotating machine formed by laminating laminated plates, each laminated plate having a disc or ring shape forming a predetermined number of magnetic poles on its circumference. The magnetic poles, or the magnetic poles and other laminated plate portions are connected by a narrow crossover portion, and a work-hardened portion due to compressive deformation of the crossover portion is provided.

According to the above, the magnetic poles of each laminated plate are connected at the crossover portion, or the magnetic poles of each laminated plate and the other laminated plate portions are connected at the crossover portion. Then, a work-hardened portion due to compressive deformation is provided in this transition portion. The work-hardened portion may be provided in all or a part of the crossover portion. In this work-hardened part, the strength against external force is increased due to the compressive deformation, and the magnetic permeability is increased and the magnetic resistance is increased.

In one aspect of the present invention, the magnetic pole laminated body is used for a rotor inserted in a stator of a rotating machine, and the laminated plate has a magnet opening for inserting a rotor magnet near the outer periphery of the rotor. Is provided and the magnetic pole is formed outside the magnet opening, and the crossover is a narrow portion between the shoulder of the magnet opening and the outer circumference of the rotor.

The above is a form in which the present invention is applied to a rotor of a rotating machine. Magnetic poles are formed outside the magnet openings of the laminated plate. A narrow portion between the shoulder of the magnet opening and the outer circumference of the rotor serves as a bridging portion that connects the magnetic pole and other laminated plate portions. A work hardening part is provided in this transition part.

Further, according to one aspect of the present invention, the magnetic pole laminated body is used for a stator of a rotating machine, and the laminated plate has a plurality of convex poles for winding a stator winding arranged in an annular shape. The connecting portion is formed in a ring shape and is a narrow connecting portion that connects the salient poles on the inner peripheral side.

The above is a form in which the present invention is applied to a stator of a rotating machine. In each laminated plate, a connecting portion is provided so as to connect adjacent convex poles on the inner peripheral side, and this connecting portion is a connecting portion connecting between the magnetic poles. Then, a work hardening part is provided in this transition part.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. Note that elements given the same reference numerals as those given to the elements shown in FIG. 4 to FIG.

[Embodiment 1] The motor of the present embodiment is different from the motor of the prior art 1 described above only in the structure of the rotor laminated plate constituting the rotor 3. Therefore, the description of the configuration common to the prior art 1 will be omitted, and only the difference will be described.

FIG. 1 shows the structure of the rotor laminated plate 51 of the first embodiment. 4A is a plan view of the rotor laminated plate 51, and shows an enlarged portion corresponding to a circle A in FIG. The shape of the rotor laminated plate 51 viewed from the direction of the arrow X in FIG. 1A is shown in FIG.
FIG. 2B shows a state in which the rotor laminated plates 51 are laminated.

As shown in FIG. 1 (a), in the rotor laminated plate 51 of the present embodiment, a work-hardened portion 53 that has been subjected to a compressive deformation process is provided in a part of the transition portion 27, and that portion of that portion is provided. The cross-sectional area is set smaller than in the prior art. FIG.
As shown in (a), the work-hardened portion 53 has the magnet opening 2
It is provided around the shoulder corner of No. 5, and the range of the work-hardened portion 53 is B in the circumferential direction. Further, as shown in FIG. 1B, the minimum thickness of the work-hardened portion 53 is t1, which is smaller than the thickness T1 of the general portion of the rotor laminated plate 51. Since the work-hardened portion 53 is thinner than the general portion, a void 55 is formed between the rotor laminated plates 51.

FIG. 2 shows the result of performing compression deformation processing.
The characteristic change of the steel plate for the rotor laminated plate 51 is shown. This figure shows the characteristics when cold rolling is performed as the compression deformation process. In the figure, the horizontal axis represents the degree of deformation (the degree of deformation by compression deformation processing), and the vertical axis represents the tensile strength and magnetic permeability of the steel sheet. As shown in the figure, the tensile strength increases as the degree of deformation increases. The increase in tensile strength is
It is based on work hardening during compression deformation. Further, the magnetic permeability decreases as the degree of deformation increases. In this way, by applying compressive deformation treatment, the tensile strength and magnetic permeability are
Two characteristics can be changed at the same time.

As is clear from FIG. 2, the work hardening portion 53.
Then, the tensile strength is higher than the general portion of the rotor laminated plate 51, and the magnetic permeability is low. As a result of giving such properties to the work-hardened portion 53, the following effects are obtained in the present embodiment.

(1) Even though the cross-sectional area of the crossover 27 is reduced, the bending strength of the crossover 27 is maintained. Therefore, the strength against the bending moment based on the centrifugal force F acting on the rotor magnet 19 is secured. From the above, the minimum width dimension w1 in the radial direction of the transition portion 27 is shown in FIG.
It can be made smaller than the minimum width dimension W1 in the related art 1 shown in FIG.

The strength with respect to the bending moment can be further increased by adjusting the width dimension of the crossover portion 27 and the degree of compressive deformation. As a result, regarding the strength of the transition portion 27, the limit of the maximum motor rotation speed can be increased.

(2) The magnetic resistance of the transition portion 27 is increased as compared with the prior art 1 for the following reasons (a) to (c), and as a result, the leakage magnetic flux Φb explained in FIG. Is also decreasing. That is, (a) the magnetic permeability decreases due to the compressive deformation, and the magnetic resistance increases in inverse proportion to the magnetic permeability. (B) It becomes thin due to compressive deformation, and the transition portion 27
The cross-sectional area of is smaller, and the magnetic resistance increases in inverse proportion to the cross-sectional area. (C) A void 55 is formed between the rotor laminated plates 51 due to the compressive deformation. Since the magnetic permeability of air is very small, the magnetic resistance increases due to the formation of voids.

[Embodiment 2] The motor of this embodiment is different from the motor of the prior art 2 described above only in the structure of the stator inner cylinder laminated plate constituting the stator inner cylinder 37. Therefore, the description of the configuration common to the prior art 2 will be omitted, and only the differences will be described.

FIG. 3 shows the structure of the stator inner cylinder laminated plate 61 of the second embodiment. 6A is a plan view of the stator inner cylinder laminated plate 61, and shows an enlarged portion corresponding to a circle B in FIG. The shape of the stator inner cylinder laminated plate 61 as viewed in the direction of the arrow Y in the figure is shown in FIG. FIG. 11B shows a state where the stator inner cylinder laminated plates 61 are laminated.

A work hardening portion 63 subjected to compression deformation processing is provided in a part of the connecting portion 45a.
The cross-sectional area of 5a is set smaller than that of the prior art 2.
As shown in FIG. 3A, the work hardening portion 63 is connected to the connecting portion 45.
It is provided in the center of a, and the range of the work hardening portion 63 is b in the circumferential direction. Further, as shown in FIG. 3B, the minimum thickness of the work hardening portion 63 is t2, which is smaller than the thickness T2 of the general portion of the stator inner cylinder laminated plate 61. The work hardening portion 63 has a reduced thickness, so that a gap 65 is formed between the stator inner cylinder laminated plates 61.

In the work hardening section 63, as in the first embodiment described with reference to FIG. 2, the stator inner cylinder laminated plate 61 is formed.
The tensile strength is higher than that of the general part and the magnetic permeability is low. As a result of giving such properties to the work hardening part 63,
The following effects are obtained in this embodiment.

(1) Although the minimum width dimension of the connecting portion 45a is reduced, the bending strength of the connecting portion 45a is maintained. Therefore, the stator inner cylinder 37 is prevented from being deformed or broken during handling, processing or press fitting. As described above, the minimum width dimension w2 in the radial direction of the transition portion (coupling portion 45a) can be made smaller than W2 in the conventional technique 2 of FIG.

(2) The magnetic resistance of the connecting portion 45a is increased as compared with the prior art 2 due to the reasons (a) to (c) described in the first embodiment, and the leakage magnetic flux Φd described in FIG. 9 is used. Has been reduced. The strength against deformation and breakage can be further improved by adjusting the width dimension of the connecting portion 45a and the degree of compression deformation.

The preferred embodiment of the present invention has been described above. It goes without saying that the present invention can be applied to a generator as well. Further, the present invention can be similarly applied to a rotating machine having only a rotor or a stator as a laminated body. Further, the work hardening part is not limited to the position shown in the first and second embodiments, and may be provided at another place of the crossover part or the connecting part, or may be provided on the entire crossover part or the connecting part.

In addition, regarding the second embodiment, the present invention can be similarly applied to a configuration in which the stator inner cylinder 37 is fitted into the stator outer cylinder 35 without being press-fitted. Further, the present invention can be applied to both the case where the inner circumference of the stator inner cylinder 37 is machined and the case where it is not machined.

[0044]

According to the present invention, the work-hardened portion is provided between the magnetic poles of each laminated plate, or in the bridging portion connecting the magnetic poles to the other laminated plate portions, so that the work-hardened portion is strong against external force. The two characteristics change at the same time such that the magnetic permeability becomes higher and the magnetic permeability becomes higher. Therefore, both effects of securing the strength of the crossover portion to prevent deformation and destruction and reducing leakage magnetic flux from the crossover portion to improve the motor performance can be achieved at the same time.

According to one aspect of the present invention, in a laminated plate forming a magnetic pole laminated body used for a rotor, a narrow portion (that is, a crossover portion) between the shoulder portion of the magnet opening and the outer circumference of the rotor.
By providing the work-hardened portion in the, the strength of the crossover portion against the bending moment based on the centrifugal force acting on the rotor magnet is increased, and other laminated plates are passed from the magnetic pole outside the magnet opening through the crossover portion. Leakage magnetic flux leaking to a part is reduced.

Further, according to one aspect of the present invention, in the laminated plate forming the magnetic pole laminated body used for the stator, the work hardening portion is provided in the narrow connecting portion connecting the convex poles on the inner peripheral side. The strength of the connecting portion against external force is increased, and the leakage magnetic flux leaking to the connecting portion is reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a shape of a rotor laminated plate of a motor according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing changes in characteristics of a laminated plate due to compression deformation processing.

FIG. 3 is an explanatory view showing a shape of a stator laminated plate of the motor according to the second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a configuration of a motor of prior art 1.

5 is a plan view of a rotor laminated plate of the motor of FIG.

FIG. 6 is a cross-sectional view showing a configuration of a motor of prior art 2.

7 is a plan view of a stator inner cylinder laminated plate of the motor of FIG. 6. FIG.

8 is a detailed view of a portion of a circle A of the motor of FIG.

9 is a detailed view of a portion of a circle B of the motor of FIG.

[Explanation of symbols]

1,31 stator, 3 rotor, 5,33 stator body, 9,43,43a convex pole, 11 stator winding,
13 rotor body, 15, 51 rotor laminated plate, 19
Rotor magnets 21, 21a Magnetic poles, 25 Magnet openings, 27 Crossovers, 35 Stator outer cylinders, 37 Stator inner cylinders, 41, 61 Stator inner cylinder laminated plates, 45, 45
a Connection part, 53,63 Work hardening part, 55,65 Void.

Claims (3)

[Claims] 1. A magnetic pole laminate for a rotating machine, which is formed by laminating laminated plates, each laminated plate having a disk shape or a ring shape forming a predetermined number of magnetic poles on its circumference, and between the magnetic poles or between the magnetic poles. And other laminated plate portions are connected by a narrow crossover portion, and a work-hardened portion due to compressive deformation is provided on the crossover portion. 2. The magnetic pole laminate for a rotating machine according to claim 1, wherein the magnetic pole laminate is used for a rotor inserted in a stator of the rotating machine, and the laminated plate has a rotor magnet near a rotor outer periphery. An opening for a magnet for inserting the magnet is formed, the magnetic pole is formed outside the opening for the magnet, and the crossover portion is a narrow portion between the shoulder of the opening for the magnet and the outer circumference of the rotor. A magnetic pole laminate for a rotating machine, wherein: 3. The magnetic pole laminate of the rotating machine according to claim 1, wherein the magnetic pole laminate is used for a stator of a rotating machine, and the laminated plate has a plurality of protrusions for winding a stator winding. A magnetic pole laminate for a rotating machine, wherein the poles are arranged in a ring shape and are formed in a ring shape, and the crossover portion is a narrow connecting portion that connects the convex poles on an inner peripheral side.