Manufacturing method for rotary electric machine protection ring and manufacturing device for rotary electric machine protection ring

Abstract

The purpose of the present invention is to, in a manufacturing method for a rotary electric machine protection ring, make it possible to obtain a laminated body by, when winding a fiber-reinforced composite material around the outside of a rotor, running the material at a high tension to suppress thread breakage in the path up to the start of winding thereof, thereby winding the material around the rotor with high tension. To achieve this purpose, this manufacturing method and manufacturing device for a rotary electric machine protection ring are configured such that: tensile stress is applied to a tape-shaped material including a resin and a reinforcing fiber bundle and the tape-shaped material is caused to travel while being brought into contact with a path constituent member; a tensile stress of 300 MPa or more is applied to the tape-shaped material in a path in a range from a certain point in a traveling path to the start point of the winding; and in the path in the range in which the tensile stress of 300 MPa or more is applied, the maximum distance of a section in which the tape-shaped material does not make contact with the path constituent member is 500 mm or less.

Description

Manufacturing method of a protection ring for a rotating electric machine and manufacturing device for a protection ring for a rotating electric machine

[0001] The present invention relates to a method and an apparatus for manufacturing a protection ring for a rotating electrical machine, which can be used to protect the rotor of a rotating electrical machine such as a generator or an electric motor.

[0002] In recent years, in order to improve the performance of rotating electric machines, there has been a demand for rotating electric machines with rotors that rotate at high speeds around their shafts. Rotating electric machines have a variety of structures, including a surface permanent magnet (SPM) type in which permanent magnets are arranged on the outer periphery of the rotor, and an internal permanent magnet (IPM) type in which permanent magnets are embedded in the rotor. When such rotating electric machines are rotated at high speeds, centrifugal force can cause the permanent magnets arranged on the outer periphery to fall off the rotor or damage the rotor itself.

[0003] Patent Document 1 describes a method of tightly winding the outer periphery of the rotor of a rotating electric machine with carbon fiber by applying tension (tensile stress) to the carbon fiber in advance in order to suppress damage and deformation of the rotating electric machine due to high-speed rotation.

[0004] Furthermore, Patent Document 2 describes a method of using a friction resistance imparting member made of an elastic roller to wind carbon fiber filaments around a liner with high tension. A liner is a container that contains a pressurized fluid inside. The carbon fiber filaments are wound around the outer periphery of the liner with high tension to prevent loosening of the carbon fiber filaments caused by differences in the linear expansion coefficients of the members.

[0005] JP 60-102850 A JP 2005-238688 A

[0006] The invention described in Patent Document 1 does not mention the specific tension value or method for pre-winding the carbon fiber around the outer periphery of the rotor when tightly winding it, and therefore the tension design cannot be realized, which ultimately leads to the problem of suppressing the rotation speed.

[0007] In the invention described in Patent Document 2, when a pressure vessel is made by winding carbon fiber, the general tension is about 5 kg / mm2 (about 50 MPa) is exemplified, and an example of high tension is about 20 kg / mm 2 (approximately 200 MPa) is exemplified. However, in the rotor of a rotating electric machine, the tension is insufficient to suppress damage or deformation of the rotating electric machine due to high-speed rotation, which causes a problem of limiting the number of rotations of the rotating electric machine. Furthermore, if a higher tension is applied to the carbon fiber and the fiber is made to run, there is a problem of thread breakage of the running carbon fiber, including the path up to the start of winding.

[0008] In this invention, the outer ring-shaped member used to protect the rotor of such a rotating electric machine is called a rotating electric machine protection ring. The present invention solves the problem of how to achieve extremely high tension when manufacturing a rotating electric machine protection ring made of a fiber-reinforced composite material that is wound around the rotor of a rotating electric machine by winding. Specifically, the present invention aims to achieve a high-performance rotating electric machine protection ring by preventing thread breakage during the running process, including the path leading up to the start of winding, when a tape-shaped material containing resin and reinforced fiber bundles is run at high tension, thereby enabling normal winding around the rotor even at high tension. The present invention also aims to provide a method and apparatus for manufacturing a rotating electric machine protection ring that suppresses displacement that occurs during operation of the rotating electric machine and ultimately enables an improvement in the power density of the rotating electric machine.

[0009] As a result of extensive research to solve the above problems, the inventors have discovered the following method and apparatus for manufacturing a protection ring for a rotating electrical machine, and have completed the present invention.

[0010] This is a method for manufacturing a rotating electric machine protection ring, in which a tensile stress is applied to a tape-like material containing resin and reinforcing fiber bundles, and the material is made to run along a predetermined path defined by components that constitute the path (hereinafter referred to as path component members) while in contact with the path component members, and then the material is wound around the material in a circular shape multiple times to form a cylindrical laminate, wherein a tensile stress of 300 MPa or more is applied to the tape-like material in the path ranging from a certain point on the path to the starting point of the winding, and the maximum distance of the section of the path in which the tensile stress of 300 MPa or more is applied where the tape-like material does not come into contact with the path component members is 500 mm or less.

[0011] Furthermore, in this method for manufacturing a protective ring for a rotating electric machine, the first path component is a first path component that is upstream of the winding start point and closest to the winding start point (excluding path component components on whose outer periphery the winding start point is located), a tensile stress of 300 MPa or more is applied to the tape-like material in the path ranging from the first path component to the winding start point, and the running length of the tape-like material running aerially without contacting the first path component is 500 mm or less. Here, when the path component is a roll, the path component component on whose outer periphery the winding start point is located is a roll that is close to or in contact with the core via the tape-like material, and on whose outer periphery the point where the material starts to be wound around the core is formed; in other words, it can be said to be a roll where a point on the outer periphery is the start point of winding the material around the core.

[0012] In addition, the manufacturing apparatus for rotating electric motor protection rings includes an unwinding device that unwinds a bobbin wound with a tape-like material containing resin and reinforcing fiber bundles, a plurality of path-forming members that form a path along which the unwound tape-like material runs, and a winding device that grips a cylindrical or approximately cylindrical core, wherein as the cylindrical or approximately cylindrical core rotates, the tape-like material is wound in a ring shape multiple times from the winding start point around the outer periphery of the core, and the path up to the winding start point includes a first path-forming member that is upstream of the winding start point and closest to the winding start point (excluding path-forming members on whose outer periphery the winding start point is located), and a running section between the first path-forming member and the winding start point in which a tensile stress of 300 MPa or more is applied to the tape-like material, and the running length of the running section is 500 mm or less.

[0013] The method for manufacturing a protective ring for a rotating electric machine according to the present invention can impart the necessary high tensile stress to the material containing resin and reinforcing fiber bundles that constitutes the cylindrical laminate, and by applying high tensile stress, it is possible to reduce thread breakage that occurs during the running process of the tape-shaped material. The protective ring for a rotating electric machine obtained according to the present invention can further improve the power density of the rotating electric machine by suppressing ring displacement during operation of the rotating electric machine.

[0014] Fig. 1 is a perspective view of a rotating electric machine protection ring according to an embodiment of the present invention; Fig. 2 is a schematic diagram of a manufacturing apparatus for a rotating electric machine protection ring according to an embodiment of the present invention; Fig. 3 is a schematic diagram of a manufacturing apparatus for a rotating electric machine protection ring according to an embodiment of the present invention, the manufacturing apparatus being provided with a cooling mechanism; Fig. 4 is a schematic diagram of a manufacturing apparatus for a rotating electric machine protection ring according to an embodiment of the present invention, the manufacturing apparatus being provided with a heating mechanism; Fig. 5 is a schematic diagram of the winding direction of a material containing resin and reinforcing fibers around a core when forming a laminate according to an embodiment of the present invention.

[0015] The configuration of the rotating electrical machine protection ring of the present invention, and the manufacturing method and manufacturing apparatus for the rotating electrical machine protection ring will be described below.

[0016] 1, the rotating electrical machine protection ring of the present invention is formed by winding a tape-like material containing resin and reinforced fiber bundles multiple times in an annular shape around a core 3 that is the final fastening component, such as the rotor of a rotating electrical machine, to form a cylindrical laminate 1. Arrow 2 indicates the winding direction of the tape-like material, and the area shown in a lighter color than the surrounding area indicates the winding end 20.

[0017] The material containing resin and reinforcing fiber bundles may be in the form of a tape or sheet in which the resin is impregnated into the reinforcing fibers. The tape-shaped material may be wound continuously from the beginning to the end of the winding, or may be wound intermittently in multiple steps. In the present invention, the term "laminated body 1" may refer to the state after the tape-shaped material that has been wound and stacked has been molded, or may refer to the state during the manufacturing process before the material is wound, stacked, and molded. The tape-shaped material may also be called a fiber bundle.

[0018] The type of the reinforcing fiber bundle is not particularly limited, and glass fiber, carbon fiber, aramid fiber, boron fiber, alumina fiber, silicon carbide fiber, etc. can be used. Two or more of these fibers may be mixed. From the viewpoint of obtaining a lightweight and highly rigid fiber-reinforced composite material, it is preferable to use carbon fiber. The number of fibers constituting the fiber bundle can be, for example, 1,000 to 50,000.

[0019] The resin used in the fiber-reinforced composite material is not particularly limited, and thermosetting resins such as epoxy resins, unsaturated polyester resins, phenolic resins, vinyl ester resins, and cyanate ester resins can be used in an uncured state, as well as thermoplastic resins such as polyaryl ether ketone resins, polyether ether ketone resins, polyether ketone ketone resins, polyetherimide resins, polyphenylene sulfide resins, polyether sulfone resins, polyamide resins, and polycarbonate resins. Two or more of these resins may be mixed and used.

[0020] The rotating electrical machine protection ring of the present invention is preferably configured by a laminate 1 formed by winding a tape-shaped material, which is made of a reinforcing fiber bundle impregnated with resin, multiple times into a ring shape. Such a tape-shaped material may be a towpreg or prepreg slit tape in which a reinforcing fiber bundle is pre-impregnated with resin, or may be a reinforcing fiber bundle impregnated with resin in-process using a method such as filament winding.

[0021] There are no particular limitations on the width of the tape-shaped material, but it is preferable to use one with a width of 1 mm to 20 mm, as this makes it easier to wind the material to form a laminate.

[0022] The rotating electric machine protection ring of the present invention preferably has an inner diameter of 1 cm to 25 cm, and it is also preferable that the ring thickness be 0.1 mm to 5.0 mm, as this enhances the displacement suppression effect of the rotating electric machine protection ring and further improves the output density of the rotating electric machine.

[0023] (Manufacturing method and device configuration of rotating electric machine protection ring) In the present invention, in the manufacturing device for cylindrical rotating electric machine protection rings made of a material containing resin and reinforcing fiber bundles, as illustrated in Figure 2, a predetermined path is formed and determined by path-forming members (path-forming members) mainly such as rolls and guides from a bobbin 4 wound with a tape-like material containing resin and reinforcing fiber bundles to the starting point of winding on a core 3, which is the final fastening member such as the rotor of a rotating electric machine.

[0024] FIG. 2 is a schematic diagram showing an example of a manufacturing apparatus for a rotating electrical machine protection ring. The manufacturing apparatus for a rotating electrical machine protection ring shown in FIG. 2 is one embodiment of the present invention, and the present invention should not be interpreted as being limited to FIG. 2 . In FIG. 2 , a tape-shaped material containing resin and reinforcing fiber bundles is drawn from a bobbin 4 (drive devices and the like are not shown). A path for the traveling tape-shaped material 102 containing resin and reinforcing fiber bundles is determined by a multi-stage roll 5, a stress applying mechanism 7, a nip roll 6, and a touch roll 12. The tape-shaped material is then wound around a core 3 from a winding start point 110 to form a laminate 1. In the path along which the tape-shaped material travels to the winding start point, a path component closest to the winding start point, i.e., a first path component, is located upstream of the winding start point. In the path between the first path component and the winding start point, the tape-shaped material 102 travels through the air. The first path component does not include a path component on whose outer periphery the winding start point is located.

[0025] 2 , the core 3 rotates in the direction of rotation indicated by arrow 9, and a tape-like material 102 containing a running resin and reinforcing fiber bundles is wound around it. A touch roll 12 is disposed in proximity to or in contact with the core 3 or the laminate 1, and the touch roll 12 may be nipped and pressed against the core or the laminate 1 by external stress, or may have a small gap, for example, a gap of 0.5 mm to 30 mm, between it and the laminate 1. Here, when determining a roll whose winding start point is on its outer periphery, the times at which the running tape-like material passes the winding start point are considered to be nearly simultaneous, whether the roll is in contact with the laminate 1 or there is a small gap of several tens of millimeters. Therefore, the touch roll 12 in proximity to or in contact with the present invention can be said to be a roll whose winding start point is on its outer periphery.

[0026] Furthermore, as long as the touch roll 12 is a roll that is close to or in contact with the core 3 or the laminate 1, it may be arranged at the start point where the running tape-like material 102 containing the resin and reinforcing fiber bundles is wound onto the core 3, or it may be arranged on the circumference of the core 3 or the laminate 1 outside the start point. When the touch roll 12 is arranged at the start point of winding, the winding start point 110 is formed on the outer periphery of the touch roll 12.

[0027] In the method for manufacturing the laminate 1, the reinforcing fiber bundle or the tape-like material containing the resin and the reinforcing fiber bundle is unwound from the bobbin 4, runs along the path while contacting a roll, a guide, or the like, and then is wound around the core 3 multiple times in an annular shape to form the laminate 1. That is, the reinforcing fiber bundle or the tape-like material containing the resin and the reinforcing fiber bundle is wound in layers around the outer periphery of the core 3. In the present invention, a tensile stress of 300 MPa or more is applied to the tape-like material by a stress application mechanism 7 along the path from a certain point (including the point where the running tape-like material starts running) on ​​the path to the winding start point. Here, the path is configured so that in the region where such high tensile stress is applied, the maximum distance 8 over which the material does not come into contact with the path-constituting members is 500 mm or less.

[0028] In the path from a certain point on the path to the winding start point to the winding start point, the distance of the section where the tape-like material does not come into contact with the path-constituting members includes, in Figure 2, the distance between the multistage roll 5 and the multistage roll 5 downstream thereof, the distance between the multistage roll 5 and the nip roll 6, the distance between the nip roll 6 and the touch roll 12, and the distance between the touch roll 12 and the core 3. If the aerial running length of the section with the longest distance among these is 500 mm or less, the required high tensile stress can be imparted, and the application of high tensile stress can reduce yarn breakage that occurs during the running process of the tape-like material. Aerial running means that the tape-like material runs in the air without coming into contact with the path-constituting members.

[0029] Furthermore, in the route ranging from the winding section, i.e., the core 3, i.e., the first route component closest to the winding start point (excluding the route component on whose outer periphery the winding start point is located), upstream of the winding start point, to the winding start point, a tensile stress of 300 MPa or more is applied to the tape-like material, and it is preferable that the aerial running length of the tape-like material is 500 mm or less.

[0030] Between the path component member and the start point of winding, the tape-like material is wound around a roll and runs through the air without contacting the path component member. The distance between the first path component member and the start point of winding refers to the distance from the point where the tape-like material leaves the first path component member to the start point of winding. The roll on whose outer periphery the start point of winding is located (touch roll 12 in Figure 2) is excluded, but the section where the material runs on that outer periphery is included in the distance to the start point of winding. The point where the tape-like material leaves the first path component member is identified as the state where the tape-like material is wound.

[0031] The inventors discovered that, because the rigidity of the resin before curing, which transmits stress through the reinforcing fibers, is low, the shorter the span length, the more likely the tensile strength of a tape material containing resin and reinforcing fiber bundles is to improve. Furthermore, they discovered that the longer the span length, the more likely the reinforcing fibers are to break. That is, by setting the maximum distance of the running section subjected to high tensile stress to 500 mm or less, a high tensile stress of 300 MPa or more is applied to the tape-shaped material, thereby suppressing the occurrence of thread breakage.

[0032] The bobbin 4 is formed by winding the above material around an inner tube. A film may be attached to the material to separate the material from the bobbin without resistance. The inner tube of the bobbin may also be made of metal.

[0033] The stress applying mechanism 7 that applies tensile stress to the material is not particularly limited, but examples include applying torque to the bobbin 4 using a brake or the like, applying frictional resistance to the material in the multi-stage rolls 5, and applying frictional resistance to the material in the nip rolls 6. Figures 2 to 4 show an example in which the stress applying mechanism 7 using the multi-stage rolls 5 is provided in the path from the bobbin to the core, and the tension applied to the running material increases each time it passes through the rolls. The tape-shaped material is applied with a tensile stress of 300 MPa or more by the stress applying mechanism 7, runs to the first path component further downstream, and is wound circularly multiple times from the starting point of winding around the core 3.

[0034] The point at which the stress applied to the material by any of the above stress application mechanisms 7 is 300 MPa or more is the "certain point on the path up to the winding start point." Note that if the stress applied to the material becomes 300 MPa or more, then drops below 300 MPa, and then returns to 300 MPa or more, the two points at which the stress becomes 300 MPa or more are the "certain point." In either case, the material is run through an apparatus that ensures that the maximum distance 8 at which the material does not come into contact with the path-constituting components is 500 mm or less in the section of the path where the stress applied to the material is 300 MPa or more. A stress of 300 MPa applied to the tape-shaped material simply means that the stress is 300 MPa in the section of the path, and may be 300 MPa in all or part of the section.

[0035] The tensile stress is preferably 500 MPa or more, more preferably 1000 MPa or more, to prevent deformation of the core 3 during rotation. Furthermore, it is desirable that the tensile stress be 6000 MPa or less due to the limit of the tensile strength of the reinforcing fiber bundles. In the above stress range where the tensile stress is higher than 300 MPa, the maximum distance 8 may be designed not to exceed a predetermined range.

[0036] The above-mentioned path forming members are mainly rolls and guides, and include those that come into contact with the material to determine its travel path. Rolls include both free rolls and drive rolls. Rolls also include touch rolls that are arranged in close proximity to or in contact with the material via a core or material, but these are excluded from the first path forming member of the present invention. The above-mentioned stress applying mechanism 7 can be a path forming member. However, it is not limited to rolls and guides. Measuring instruments such as tension meters and speed meters may come into contact with the material on the travel path, but do not usually determine the material travel path. Therefore, unless it is clear that they determine the material travel path, they are not included in the path forming members.

[0037] The maximum distance 8 is preferably as short as possible to prevent breakage of the material or partial thread breakage, but is preferably 500 mm or less, more preferably 300 mm or less, and even more preferably 200 mm or less. The lower limit of the maximum distance 8 is not particularly specified, but may be set to, for example, 1 mm or more. When the material is run under a high tension exceeding that of conventional technology, if the maximum distance 8 is longer than a specified range, breakage of the material and fiber thread breakage increase. The path that constitutes the maximum distance 8 is usually linear because there are no components that bend the material path, such as rolls or guides, but this is not necessarily limited to this.

[0038] The core 3 is a component that will ultimately be fastened with a material, such as a rotor of a rotating electrical machine. The laminate 1 is formed by winding a material containing a resin and reinforced fiber bundles in a stacked manner at the same height when the end faces 13 of the core 3 are placed vertically, as shown in Fig. 5 . In other words, when the circumferential direction 14 of the core 3 (angle 15 is 0°) is defined as the reference direction, the material may be wound in a stacked manner in the reference direction, or by winding in a spiral manner by changing the angle 15 from the reference direction. The winding is performed by rotating the core 3 in the core rotation direction 9.

[0039] When an uncured thermosetting resin is used as the resin constituting the material, the laminate 1 can be cured by applying heat and pressure using a method such as autoclave molding or tape wrap molding to obtain a rotating electrical machine protection ring. Also, as shown in Figure 3, a cooling mechanism 10 may be used to cool at least a portion, preferably all, of the material from a higher temperature to 20°C or less, preferably 15°C or less, and more preferably 5°C or less, before or during the stress application process. Cooling a material using a thermosetting resin is preferable because it can improve viscosity by suppressing molecular motion and prevent thread breakage.

[0040] As shown in FIG. 4 , at least a portion, preferably the entire material, may be heated by a heating mechanism 11 before or during the stress application process. Heating a material made of a thermosetting resin is preferable because the viscosity increases as the curing reaction progresses, potentially reducing thread breakage. Here, "before or during the stress application process" refers to the stage before or during which a tensile stress of 300 MPa or more is applied to the material. For example, when the multi-stage roll 5 or nip roll 6 described above is used as the stress application mechanism 7, this refers to the stage before or during which the material begins to pass through the stress application mechanism. When heating a material made of a thermosetting resin, it is preferable to heat the material between the thermosetting temperature and a temperature 100°C lower than that temperature. For example, when using a material that thermosets at 150°C, it is preferable to heat the material to a temperature between 50°C and 150°C using the heating mechanism 11.

[0041] When a thermoplastic resin is used as the material, the rotating electrical machine protection ring can be obtained at the same time as the laminate 1 is constructed by applying heat with a laser or the like to weld the material while winding it.

[0042] Below, specific manufacturing examples and comparative examples of the molding method for the rotating electrical machine protection ring of the present invention are described. [Example 1] As a tape-shaped material, a towpreg was prepared by impregnating a carbon fiber bundle (T700S-12K) with an epoxy-based resin to obtain a resin content of 30 mass%. To simulate a yarn path in which the maximum distance of the section in which the tape-shaped material does not contact the path-constituting components is 500 mm, an Instron universal testing machine (manufactured by Instron) was used. The span was set to 500 mm, the crosshead speed was set to 2.5 mm / min, and the number of samples was set to n = 3. A tensile stress of up to 300 MPa was applied to the tape-shaped material, and the presence or absence of partial yarn breakage in the tape-shaped material was evaluated. The results showed that no partial yarn breakage occurred after the test.

[0043] This shows that it is possible to wind tape-shaped material with high tensile stress around the outer circumference of the rotor in a rotating electric machine, making it possible to manufacture a rotating electric machine protective ring that can suppress displacement that occurs during rotational operation.

[0044] [Example 2] The same tape-like material as in Example 1 was used, and the same tensile stress as in Example 1 was applied to the tape-like material using the same testing machine as in Example 1, except that the span was set to 400 mm. After the test, the tape-like material was evaluated for the presence or absence of partial thread breakage, and no partial thread breakage was found.

[0045] [Example 3] The same tape-like material as in Example 1 was used, and the same tensile stress as in Example 1 was applied to the tape-like material using the same testing machine as in Example 1, except that the span was set to 100 mm. After the test, the tape-like material was evaluated for partial thread breakage, and no partial thread breakage occurred. Furthermore, a tensile stress of up to 600 MPa was applied, but no partial thread breakage occurred.

[0046] Comparative Example 1 The same tape-like material as in Example 1 was used, and the same tensile stress as in Example 1 was applied to the tape-like material using the same testing machine as in Example 1, except that the span was set to 600 mm. Partial thread breakage occurred in the tape-like material after the test.

[0047] [Comparative Example 2] The same tape-like material as in Example 1 was used, and the same tensile stress as in Example 1 was applied to the tape-like material using the same testing machine as in Example 1, except that the span was set to 700 mm. When the tape-like material was evaluated for partial thread breakage, partial thread breakage occurred.

[0048] Example 4 Using the rotating electrical machine protection ring manufacturing apparatus shown in FIG. 2 , the same tape-like material as in Example 1 was wound to form a laminate. In FIG. 2 , a cylindrical rotor was placed on the core 3, and the tape-like material was wound around the outer periphery. A touch roll 12 was placed on the core 3, and the tape-like material ran over the touch roll 12, passing through the winding start point, and then wound onto the core 3. A very narrow gap (1 mm) existed between the touch roll 12 and the laminate of tape-like material wound around the core 3. In this case, the roll serving as the first path component was the roll closest upstream from the core 3, excluding the touch roll 12 whose winding start point 110 was formed on its outer periphery, and was the roll indicated by reference numeral 6 in FIG. 2 . The distance between the first path component and the winding start point (the aerial running length) was 300 mm.

[0049] A path was created from the bobbin through multiple path-constituting members constituting the path and through a stress-applying process to the core 3. The unwinding speed was 5 m / min, and a tensile stress of 300 MPa was applied using a multistage roll 5 and a nip roll 6 to a range of a maximum distance 8 where the material did not come into contact with the path-constituting members in the region where high tension was applied. The laminate formed in this manner had a diameter of 14 cm, a width of 10 cm, and a thickness of 2.0 mm.

[0050] The tape-like material was evaluated for partial thread breakage, and no partial thread breakage occurred. The rotating electrical machine protection ring wound with the tape-like material was wound around the core with high tension, resulting in a good laminate.

[0051] The rotating electric machine protection ring of the present invention can be attached to the outside of the rotor of a rotating electric machine such as a generator or an electric motor, and can be used to protect the rotor, which includes magnets, from damage caused by centrifugal force when the rotating electric machine is in operation. The present invention can also provide a rotating electric machine composed of such a rotating electric machine protection ring and rotor. It can also be used to protect flywheels used for energy storage from damage caused by centrifugal force.

[0052] For example, the present invention can be suitably applied to the SPM type electric motors described above, which can prevent the permanent magnets from falling off the rotor due to centrifugal force during operation, thereby enabling the rotating electric machine to rotate at high speed. The present invention can also be suitably applied to the IPM type electric motors described above, as well as winding-type electric motors using electromagnets, reluctance-type electric motors using magnetic resistance, and induction-type electric motors that do not use magnets, which can prevent damage to electromagnetic steel sheets and the like due to centrifugal force during operation, thereby enabling the rotating electric machine to rotate at high speed.

[0053] REFERENCE SIGNS LIST 1 Laminate 100 Rotor of rotating electric machine 101 Protective ring for rotating electric machine 102 Tape-shaped material containing resin and reinforced fiber bundle 110 Starting point of winding 2 Winding direction of tape-shaped material 3 Core 4 Bobbin 5 Multi-stage roll 6 Nip roll 7 Stress applying mechanism 8 Maximum distance where material does not come into contact with path constituent member in region where high tension is applied 9 Rotation direction of core 10 Cooling mechanism 11 Heating mechanism 12 Touch roll 13 End surface 14 Circumferential direction 15 Winding angle from reference direction 20 End portion at winding end

Claims

1. A method for manufacturing a rotating electric machine protection ring, comprising applying a tensile stress to a tape-like material containing resin and reinforcing fiber bundles, running the material along a predetermined path defined by a plurality of components constituting the path (hereinafter referred to as path constituent components) while in contact with the path constituent components, and then winding the material in a circular shape several times to form a cylindrical laminate, wherein a tensile stress of 300 MPa or more is applied to the tape-like material in a range from a certain point on the path to the start point of the winding, and within the range of the path where a tensile stress of 300 MPa or more is applied, the maximum distance of the section of the tape-like material that does not come into contact with the path constituent components is 500 mm or less.

2. A method for manufacturing a rotating electric protection ring as described in claim 1, wherein a path component member that is upstream of the starting point of the winding and closest to the starting point of the winding (excluding a path component member on whose outer periphery the starting point of the winding is located) is defined as a first path component member, and in the path ranging from the first path component member to the starting point of the winding, a tensile stress of 300 MPa or more is applied to the tape-like material, and the running length of the tape-like material that runs aerially without contacting the first path component member is 500 mm or less.

3. A method for manufacturing a rotating electric machine protection ring as described in claim 1 or 2, comprising a stress applying process in which stress is applied to a tape-shaped material running along the path by the path constituent members, thereby increasing the tensile stress of the tape-shaped material to 300 MPa or more.

4. A method for manufacturing a rotating electric machine protection ring as described in claim 3, wherein the resin is an uncured thermosetting resin, and at least a portion of the tape-shaped material is cooled to 20°C or below before or during the stress application process.

5. A method for manufacturing a protection ring for a rotating electrical machine as set forth in claim 3, wherein said resin is an uncured thermosetting resin, and at least a portion of said tape-like material is heated before or during said stress application step.

6. A manufacturing device for a rotating electric machine protection ring, comprising: an unwinding device that unwinds a bobbin around which a tape-like material containing resin and reinforced fiber bundles is wound; a plurality of path forming members that form a path along which the unwound tape-like material runs; and a winding device that grips a cylindrical or approximately cylindrical core, wherein the cylindrical or approximately cylindrical core rotates, so that the tape-like material is wound in a circular shape multiple times from a winding start point around the outer periphery of the core, and in the path leading to the winding start point, a first path forming member (excluding a path forming member on whose outer periphery the winding start point is located) is located upstream of the winding start point and is closest to the winding start point, and a running section is provided between the first path forming member and the winding start point, in which a tensile stress of 300 MPa or more is applied to the tape-like material, and the running length of the running section is 500 mm or less.

7. A manufacturing apparatus for a rotating electric machine protection ring as described in claim 6, further comprising a stress applying mechanism for applying a tensile stress to the running tape-shaped material, the stress applying mechanism applying a tensile stress of 300 MPa or more to the tape-shaped material and causing the tape-shaped material to run on a first path component member further downstream.

8. The manufacturing apparatus for a protection ring for a rotating electric machine according to claim 7, further comprising a cooling mechanism for cooling at least a portion of said material to 20° C. or less, located before said stress applying mechanism or at the same position as said stress applying mechanism.

9. The manufacturing apparatus for a protection ring for a rotating electric machine according to claim 7, further comprising a heating mechanism for heating at least a portion of said tape-like material, located before said stress applying mechanism or at the same position as said stress applying mechanism.

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