Rotary electric machine protection ring, method for manufacturing rotary electric

Abstract

The invention provides a rotating electric machine protection ring and a manufacturing method of the rotating electric machine protection ring. The rotating electrical machine protection ring is formed by annularly winding a strip-shaped or sheet-shaped material formed by impregnating reinforcing fibers with resin multiple times to form a cylindrical laminated body, and the same fiber exists in a plurality of layers extending from the outermost layer to the inner peripheral side in the winding end region of the outermost layer of the laminated body. The present invention relates to a rotating electrical machine guard ring comprising a fiber-reinforced composite material wound around the outside of a rotor of a rotating electrical machine, the strength of the rotating electrical machine guard ring being improved and higher-speed rotation of the rotating electrical machine being achieved by suppressing peeling of a winding end portion of the rotating electrical machine guard ring occurring during operation of the rotating electrical machine.

Description

Technical Field

[0001] The present invention relates to a protective ring for a rotating electrical machine, a method for manufacturing the same, a rotating electrical machine, and an electric mobile device. Background Art

[0002] In recent years, in order to improve the performance of rotating electrical machines, high-speed rotation of rotating electrical machines has been required. As rotating electrical machines, an SPM (Surface Permanent Magnet) type in which permanent magnets are arranged on the outer peripheral side of a rotor and an IPM (Internal Permanent Magnet) type in which permanent magnets are buried and arranged in a rotor can be cited. However, when the rotating electrical machine is rotated at high speed, due to centrifugal force, the permanent magnets arranged on the outer periphery may fall off from the rotor, or the rotor itself may be damaged. In order to suppress the destruction of the rotating electrical machine associated with such high-speed rotation, Patent Document 1 discloses an annular material that is covered and installed on the outer peripheral surface side of the permanent magnets arranged on the outer peripheral side of a rotating member in an SPM type rotating electrical machine, and is an annular material in which a belt-shaped fiber bundle formed by flatly bundling a plurality of filamentous fibers arranged in one direction is formed into a covering cylinder.

[0003] As the above-described annular material, for reasons such as high strength and light weight, a fiber-reinforced composite material, and in particular, a material using carbon fiber as a reinforcing fiber is described as a preferred raw material.

[0004] Patent Document 2 discloses a restraint member that restrains magnets arranged on the outer periphery from the outer periphery in a manner of surrounding the outer periphery of the rotating shaft of the rotor of a rotating electrical machine in a circular shape. The restraint member is formed by winding a fiber bundle formed by bundling a plurality of fibers into a belt shape a plurality of times to form a laminated ring shape, and integrally bonding with a resin serving as a matrix. A method of suppressing peeling of the winding end by cutting the winding end into a substantially V shape is described.

[0005] Prior Art Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-71763

[0007] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2019-110622 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] In the invention described in Patent Document 1, when a strong tension is applied to the above-described covering cylinder (ring) by centrifugal force associated with the high-speed rotation of the rotating electrical machine, the material constituting the end portion formed by winding and molding the belt-shaped fiber bundle peels off from other portions, whereby the ring is damaged and the strength is reduced.

[0010] In the invention described in Patent Document 2, although the peeling of the winding end is suppressed by cutting it into a V shape, since the stress is concentrated at the front end of the V-shaped cut, the effect of suppressing the peeling of the winding end is insufficient.

[0011] Here, in the present invention, a ring-shaped material that is wound around the outside of the rotor of a rotating electric machine and can be used to protect it is referred to as a rotating electric machine protection ring.

[0012] An object of the present invention is to provide a rotating electric machine protection ring, a method for manufacturing the same, a rotating electric machine, and an electric mobile device, which improve the disadvantages of the prior art. For a rotating electric machine protection ring composed of a fiber-reinforced composite material wound around the outside of the rotor of a rotating electric machine, by suppressing the peeling of the winding end portion of the rotating electric machine protection ring that occurs during the operation of the rotating electric machine, the strength of the rotating electric machine protection ring can be increased, and a higher-speed rotation of the rotating electric machine can be achieved.

[0013] Means for Solving the Problem

[0014] To solve the above problems, the present invention has the following technical configurations.

[0015] [1] A rotating electric machine protection ring is formed by winding a strip-shaped or sheet-shaped material impregnated with reinforcing fibers in a ring shape multiple times to form a cylindrical laminate. In the winding end region of the outermost layer of the laminate, the same fiber exists across multiple layers from the outermost layer to the inner peripheral side layer.

[0016] [2] The rotating electric machine protection ring according to [1], wherein the same fiber existing across multiple layers includes the fiber constituting the strip-shaped or sheet-shaped material.

[0017] [3] The rotating electric machine protection ring according to [1], wherein the same fiber existing across multiple layers includes fibers other than the fiber constituting the strip-shaped or sheet-shaped material.

[0018] [4] A method for manufacturing a rotating electric machine protection ring, wherein the rotating electric machine protection ring is formed by winding a strip-shaped or sheet-shaped material impregnated with reinforcing fibers in a ring shape multiple times to form a cylindrical laminate, and then molding the laminate. In the winding end region of the laminate, a fiber pressing tool is inserted from the outermost layer to the inner peripheral side layer, so that the fiber constituting the strip-shaped or sheet-shaped material in the outer peripheral side layer including the outermost layer penetrates into the inner peripheral side layer.

[0019] [5] A method for manufacturing a protective ring for a rotating electrical machine, wherein the protective ring for a rotating electrical machine is formed by annularly winding a strip-shaped or sheet-shaped material impregnated with a resin in reinforcing fibers multiple times to form a cylindrical laminate, and then molding the laminate. In the winding end region of the laminate, fibers constituting the strip-shaped or sheet-shaped material and an auxiliary wire are stitched across multiple layers from the outermost layer to the inner peripheral side layer, and the auxiliary wire is a fiber other than the fiber constituting the strip-shaped or sheet-shaped material.

[0020] [6] A rotating electrical machine having the protective ring for a rotating electrical machine according to any one of [1] to [3], wherein the single-unit output of the rotating electrical machine is 200 kW or more.

[0021] [7] A rotating electrical machine having the protective ring for a rotating electrical machine according to any one of [1] to [3], wherein the single-unit output density of the rotating electrical machine is 6 kW / kg or more.

[0022] [8] An electric mobile device having the rotating electrical machine according to [6] or [7].

[0023] Effects of the Invention

[0024] The protective ring for a rotating electrical machine according to the present invention can suppress peeling of the winding end portion in the length direction of the outermost layer of the ring when the rotating electrical machine operates, and thus can enable the rotating electrical machine to rotate at a higher speed. Description of the Drawings

[0025] Figure 1 is a perspective view of the protective ring for a rotating electrical machine according to an embodiment of the present invention.

[0026] Figure 2 is a side cross-sectional view showing a form in which fibers of the strip-shaped or sheet-shaped material in the outer peripheral side layer penetrate further to the inner peripheral side in the winding end region.

[0027] Figure 3 is a front cross-sectional view showing a form in which, in the winding end region, fibers constituting the strip-shaped or sheet-shaped material are stitched across multiple layers from the outermost layer to the inner peripheral side layer using an auxiliary wire. Detailed Embodiments

[0028] Hereinafter, the structure of the protective ring for a rotating electrical machine of the present invention and the method for manufacturing the protective ring for a rotating electrical machine will be mainly described.

[0029] (Structure of the Protective Ring for a Rotating Electrical Machine)

[0030] The rotating electrical machine protection ring of the present invention is formed by annularly winding a strip or sheet material impregnated with a resin in a reinforcing fiber multiple times to form a cylindrical laminate. The strip or sheet material can be continuously wound from the winding start point to the winding end point, or can be intermittently wound in multiple times. In addition, in the present disclosure, the laminate is used as a term representing two states, namely, the state before molding and the state after molding.

[0031] In addition, in the present disclosure, the cylindrical shape includes a shape deformed from a complete cylindrical shape by allowing the fibers in the outer peripheral layer including the outermost layer to penetrate into the inner peripheral layer and the material to sink.

[0032] There is no particular limitation on the reinforcing fiber used in the above fiber-reinforced composite material, and glass fiber, carbon fiber, aramid fiber, boron fiber, alumina fiber, silicon carbide fiber, etc. can be used. Two or more of these fibers can also be used in combination. From the viewpoint of obtaining a lightweight and highly rigid fiber-reinforced composite material, carbon fiber is preferably used.

[0033] There is no particular limitation on the fiber diameter of the reinforcing fiber used in the above fiber-reinforced composite material. The fiber diameter is preferably 10 μm or less, more preferably 8 μm or less, and further preferably 6 μm or less. Those with a fiber diameter of 4.5 μm or more can be used.

[0034] The fiber diameter of the above reinforcing fiber is measured as follows. Taking multiple measured reinforcing fibers as objects, the mass per unit length Af (g / m) and specific gravity Bf (g / cm 3 ) are obtained. Based on the obtained values of Af and Bf and the number of fiber roots Cf of the measured reinforcing fiber, the fiber diameter (μm) of the reinforcing fiber is calculated using the following formula.

[0035] Fiber diameter of reinforcing fiber (μm) = ((Af / Bf / Cf) / π) (1 / 2) × 2 × 10 3

[0036] There is no particular limitation on the resin used in the above fiber-reinforced composite material. In addition to thermosetting resins such as epoxy resin, unsaturated polyester resin, phenolic resin, vinyl ester resin, and cyanate resin, thermoplastic resins such as polyaryletherketone resin, polyetheretherketone resin, polyetherketoneketone resin, polyetherimide resin, polyphenylene sulfide resin, polyethersulfone resin, polyamide resin, and polycarbonate resin can also be used. Two or more of these resins can be used in combination.

[0037] The rotating electrical machine protection ring in the present invention is composed of a laminate formed by annularly winding a strip or sheet material impregnated with a resin in a reinforcing fiber multiple times.

[0038] The strip or sheet material may be a prepreg material or a slit tape in which reinforcing fibers are pre-impregnated with a resin, or a material formed by winding reinforcing fibers annularly by a method such as fiber winding and impregnating the resin into the reinforcing fibers in this state. In addition, the above-mentioned slit tape is a kind of strip material, which is a material obtained by pre-impregnating reinforcing fibers with a resin and cutting it into a predetermined width in a strip shape.

[0039] There is no particular limitation on the width of the strip or sheet material. When using a material with a width of 1 mm to 100 mm, it is easy to wind and form a laminate, so it is preferred. In addition, it is sometimes not possible to clearly identify a strip material and a sheet material. For example, when the width is 100 mm, it can be called either a strip material or a sheet material. On the other hand, generally, if the width is 1 mm to 30 mm, it can be called a strip material.

[0040] In the present invention, in the winding end region of the outermost layer of the above-mentioned laminate, the same fiber exists across a plurality of layers from the outermost layer to the inner peripheral side layer. In other words, the same fiber exists across a plurality of layers including the outermost layer. The same fiber that exists across a plurality of layers from the outermost layer to the inner peripheral side layer may be a part of the fiber constituting the above-mentioned strip or sheet material, or a fiber other than the fiber constituting the strip or sheet material. The same fiber may exist across two or more layers, more preferably across three or more layers, and further preferably across five or more layers.

[0041] As Figure 1 shown, the above-mentioned winding end region 3 of the outermost layer means that in the circle observed by looking down the cylindrical laminate according to the present invention in the axial direction, taking the line connecting the winding end 2 and the center of the circle as the starting point (0°), when the angle formed in the direction opposite to the direction of winding the strip or sheet material is set as Θ, the circumferential region where Θ is in the range of 0° or more and 30° or less ( Figure 1 ).

[0042] The winding end 2 refers to the end in the length direction in the laminate formed by winding the strip or sheet material.

[0043] In the present invention, if at least a part of the fiber that exists across the above-mentioned plurality of layers is present in the range from the winding end (Θ = 0°) to Θ being 15° or less, the peeling suppression effect of the rotating electrical machine protection ring can be further improved, so it is preferred.

[0044] The inner diameter of the rotating electrical machine protection ring of the present invention is preferably 1 cm to 25 cm. Additionally, the thickness of the ring is preferably 0.1 mm to 5.0 mm. When the inner diameter and thickness of the rotating electrical machine protection ring are within the above ranges, the outermost layer peeling inhibition effect of the rotating electrical machine protection ring is improved, and the rotating electrical machine can rotate at a higher speed.

[0045] The thickness of the above laminate does not need to be uniform throughout the circumference of the laminate. Part of it can be raised or depressed, and it can also cover multiple parts.

[0046] (Forming method of the rotating electrical machine protection ring)

[0047] In the present invention, the laminate is formed from a strip-shaped or sheet-shaped material, and it is usually preferably wound into a cylindrical material.

[0048] As the above cylindrical material, either a core material such as a mandrel or a component such as a rotor of a rotating electrical machine that becomes the object to be finally fastened can be used.

[0049] The formation of the laminate can be carried out by repeatedly winding the strip-shaped or sheet-shaped material in the 0° direction based on the circumferential direction of the cylindrical material, in other words, by overlapping and winding at the same height position of the cylindrical material, or it can be wound in a spiral shape by changing the angle from the above reference direction.

[0050] In the case of using a thermosetting resin as the resin of the constituent material, by methods such as autoclave molding and filament winding molding, heat and pressure are applied to the above laminate to cure it, and thus a rotating electrical machine protection ring can be obtained.

[0051] In the case of using a thermoplastic resin as the material, during the above lamination, it is heated with a laser or the like while winding, or vibration cladding or ultrasonic cladding is performed to make it clad, and thus a rotating electrical machine protection ring can be obtained while forming the laminate.

[0052] The above-mentioned same fiber existing across multiple layers can include a part of the fiber constituting the strip-shaped or sheet-shaped material, or can include a fiber other than the fiber constituting the strip-shaped or sheet-shaped material. The above-mentioned same fiber existing across multiple layers can include both the fiber constituting the strip-shaped or sheet-shaped material and the fiber other than the fiber constituting the material.

[0053] In the case where the same fiber existing across multiple layers is a part of the fiber constituting the strip-shaped or sheet-shaped material, when the resin is a thermosetting resin, before or during the curing of the formed laminate, for example, a fiber pressing tool such as a pin or a cylindrical shape is used to press into the winding end area of the laminate, and thus, by using its insertion pressure, a part where the fiber constituting the strip-shaped or sheet-shaped material penetrates from the outermost layer into the inner layer can be formed ( Figure 2 )

[0054] In addition, when the resin is a thermosetting resin, vibration or ultrasonic waves are applied to the winding end region of the laminate before or during the curing process when the laminate is formed and cured. When the resin is a thermoplastic resin, vibration or ultrasonic waves are applied to the laminate during the forming process of the laminate. By this vibration and heating, a portion where the fibers penetrate from the outermost layer into the inner layer can also be formed.

[0055] As the material of the pin, which is a representative example of the fiber pressing tool, metal is preferred. In addition, as the shape and form, a single needle or a plurality of needles arranged on a base can be used.

[0056] In addition, when the same fiber that extends across multiple layers is a fiber other than the fiber that constitutes the belt-shaped or sheet-shaped material, before the laminate is formed and cured, the fiber that constitutes the belt-shaped or sheet-shaped material and the auxiliary line composed of fibers other than the fiber that constitutes the belt-shaped or sheet-shaped material are sewn from the outermost layer of the laminate to the inner peripheral layer by one or more layers. Thereby, a portion can be formed in which the auxiliary line composed of fibers other than the fiber that constitutes the belt-shaped or sheet-shaped material exists in one or more layers from the outermost layer to the inner peripheral layer ( Figure 3 ). There is no limitation on the direction of sewing the auxiliary line. If sewing is performed in a direction orthogonal to the direction of the fiber that constitutes the belt-shaped or sheet-shaped material, end peeling can be further suppressed, so it is preferred.

[0057] The fiber used as the above-mentioned auxiliary line may be any fiber other than the fiber that constitutes the belt-shaped or sheet-shaped material, and is not particularly limited. For example, glass fiber, carbon fiber, aramid fiber, boron fiber, alumina fiber, silicon carbide fiber, etc. can be used. Two or more of these fibers can be used in combination.

[0058] The rotating electrical machine according to the present invention has the above-mentioned rotating electrical machine protection ring. More specifically, it is composed of the above-mentioned rotating electrical machine protection ring and a rotor. And in the present invention, this rotating electrical machine can also be used and provided as an electric mobile device having a rotating electrical machine.

[0059] The electric mobile devices mentioned here include electric vehicles, electric aircraft, electric ships, etc., but as long as it is a mobile device driven by a rotating electrical machine, it is not limited thereto. According to this technology, the output or output density of the rotating electrical machine is increased, and weight reduction and miniaturization can be achieved. Therefore, an increase in the cruising range and an increase in the design freedom can be expected as a mobile device. The output of a single rotating electrical machine, that is, the single output, is preferably 200 kW or more, more preferably 300 kW or more. In addition, a rotating electrical machine of 2,000 kW or less can be used. In addition, the output density of a single rotating electrical machine, that is, the single output density, is preferably 6 kW / kg or more, more preferably 8 kW / kg or more. In addition, a rotating electrical machine of 30 kW or less can be used.

[0060] Embodiment

[0061] Hereinafter, embodiments of a specific molding method of the rotating electrical machine protection ring of the present invention will be described.

[0062] Furthermore, the peeling test of the winding end portion of the laminate is carried out and evaluated by the method shown below.

[0063] · Peeling test of winding end portion

[0064] Taking the rotating electrical machine protection rings obtained in each of the examples and comparative examples as objects, using an Instron universal testing machine (manufactured by Instron Corporation), the diameter of the tool provided on the inner circumference of the object is set to 130 mm, and the crosshead speed is set to 2.5 mm / minute, and the NOL ring test (ASTM D2290 (2019)) is carried out. When increasing the load applied to the ring, in the case where the rotating electrical machine protection ring breaks and no peeling of the winding end portion is confirmed, it is evaluated that the peeling of the winding end portion is suppressed, and the load applied to the ring at the time of peeling is taken as the load at the time of peeling. In addition, the load applied to the ring at the time of ring breakage is taken as the load at the time of ring breakage. Furthermore, when a state where the winding end portion is slightly peeled from the inner layer is confirmed, it is regarded as peeled.

[0065] (Example 1)

[0066] As the cylindrical material for forming the laminate, a metal mandrel with a diameter of 150 mm and a width of 15 mm is used. In addition, a plurality of bundles formed by arranging carbon fibers with a fiber diameter of 5 μm at 12,000 fibers / bundle are arranged to form a reinforcing fiber sheet aligned in one direction so that the unit area weight becomes 100 g / m 2 and impregnated with an epoxy resin composition composed of bisphenol A type epoxy resin, dicyandiamide (curing agent), diuron (curing accelerator), and polyvinyl formal (viscosity regulator) to obtain a sheet-like unidirectional prepreg with a resin content of 30% by mass, which is cut in the width direction of the unidirectionally arranged fibers with a width of 15 mm, and a strip-shaped material is prepared as the strip-shaped material constituting the laminate.

[0067] On the above-mentioned mandrel, the cut strip-shaped prepreg is pasted in a direction where the length direction of the fiber is orthogonal to the axial direction of the mandrel, and then wound while applying tension until the thickness reaches 1 mm to form a laminate.

[0068] In the winding end region of the outermost layer of the formed laminate, at positions 1.5 mm from the winding end towards the direction opposite to the winding direction and at positions 3 mm, 7 mm, and 11 mm from one side surface of the prepreg in the width direction at three locations, align the circumference of a metal pin with a diameter of 1 mm and insert the pin. Next, at positions 4 mm from the winding end towards the direction opposite to the winding direction and at positions 5 mm and 9 mm from one side surface of the prepreg in the width direction at two locations, align the circumference of the pin in the same manner as above and insert the pin. Finally, at a position 6.5 mm from the winding end towards the direction opposite to the winding direction and at a position 7 mm from one side surface of the prepreg in the width direction at one location, align the circumference of the pin in the same manner as above and insert the pin. Additionally, as described above, the diameter of the pin is 1 mm, and when there are multiple pin insertion sites, the interval between adjacent insertion sites is 3 mm. At any position where the pin is inserted, a portion where the fiber penetrates into the inner layer on the inner circumferential side is formed. According to the insertion amount of the pin, it was confirmed that the fiber penetrated into the fifth layer from the outermost layer.

[0069] After forming the portion where the fiber penetrates, cover the laminate with a bag film and perform pressure and heat curing using an autoclave to form the rotating electric machine protection ring.

[0070] (Example 2)

[0071] As the cylindrical material for forming the laminate, a metal mandrel with a diameter of 130 mm and a height of 15 mm was used. Additionally, a sheet-shaped unidirectional prepreg was obtained under the same conditions as in Example 1 and cut into strips with a width of 7 mm in the width direction of the fiber to prepare a strip-shaped material.

[0072] On the above-mentioned mandrel, after pasting the cut strip-shaped prepreg in a direction where the length direction of the fiber is orthogonal to the axial direction of the mandrel, it was spirally wound while applying tension until the thickness reached 1 mm to form a laminate.

[0073] Prepare two cylindrical fiber pressing tools with a circular cross-section having a diameter of 0.7 mm and a length of 15 mm, align the length direction with the winding direction, align one end with the winding end, and place them on the winding end region of the outermost layer of the formed laminate. The position of the center of the two cylindrical fiber pressing tools in the width direction of the laminate is set at a position 1.95 mm from both ends in the width direction. In this state, cover the laminate with a bag film and perform pressure and heat curing using an autoclave, thereby sinking the cylindrical fiber pressing tools into the inner layer, inserting them into the laminate, and at the same time forming the rotating electric machine protection ring.

[0074] When observing the laminate from the side, the calculation is performed by obtaining the length in the thickness direction of the laminate of the cylindrical fiber pressing tool not inserted into the laminate, and it is confirmed that the fiber penetrates into the inner layer of the third layer from the outermost layer.

[0075] Regarding the rotating electrical machine protection ring manufactured by the above method, a peeling test of the winding end portion was conducted, and as a result, the peeling suppression effect was confirmed in both Examples 1 and 2. The results are shown in Table 1.

[0076] (Comparative Example 1)

[0077] A rotating electrical machine protection ring was obtained under the same conditions as in Example 2, except for the portion where the layer with fiber penetration into the inner peripheral side was not formed.

[0078] Regarding the rotating electrical machine protection ring manufactured by the above method, a peeling test of the winding end portion was conducted, and as a result, the peeling suppression effect was not confirmed. The results are shown in Table 1.

[0079] Table 1

[0080] Example 1 Example 2 Comparative Example 1 Number of layers where the same fiber exists 5 3 0 Location where the same fiber exists 5 2 0 Load (kN) at the time of peeling - 15.0 10.8

[0081] Industrial Applicability

[0082] The rotating electrical machine protection ring of the present invention is installed outside the rotor of a rotating electrical machine such as a generator or a motor, and can be used to protect the rotor including a magnet from damage caused by centrifugal force during the operation of the rotating electrical machine. According to the present invention, a rotating electrical machine composed of the rotating electrical machine protection ring and the rotor can also be provided. In addition, in the present invention, an electric mobile device using the rotating electrical machine can also be provided.

[0083] For example, it can be preferably applied to the above-mentioned SPM type motor. Since it can suppress the permanent magnet from falling off the rotor due to centrifugal force during operation, the rotating electrical machine can rotate at high speed. In addition, it can also be preferably applied to the above-mentioned IPM type motor. Since it can suppress the damage to the electromagnetic steel sheet caused by centrifugal force during operation, the rotating electrical machine can rotate at high speed.

[0084] Explanation of Reference Numerals

[0085] 1 Laminate

[0086] 2 Winding End Portion

[0087] 3 Winding End Region

[0088] 4 Winding Direction

[0089] 5 In the circle observed when looking down at the ring, the angle Θ formed in the direction opposite to the winding direction 4 of the material, starting from the radius to the winding end portion 2 (0°)

[0090] The outermost layer of the laminate 1

[0091] The inner layer of the laminate 1

[0092] The space generated by the fiber penetrating into the inner peripheral side layer

[0093] The radial direction of the ring

[0094] Auxiliary line

[0095] The fiber constituting the strip or sheet material

Claims

1. A rotating electrical machine protection ring is a rotating electrical machine protection ring formed by annularly winding a strip or sheet material impregnated with a reinforcing fiber multiple times to form a cylindrical laminate. In the winding end region of the outermost layer of the laminate, the same fiber exists across multiple layers from the outermost layer to the inner peripheral side layer.

2. The rotating electrical machine protection ring according to claim 1, wherein the same fiber existing across multiple layers includes the fiber constituting the strip or sheet material.

3. The rotating electrical machine protection ring according to claim 1, wherein the same fiber existing across multiple layers includes a fiber other than the fiber constituting the strip or sheet material.

4. A method for manufacturing a rotating electrical machine protection ring, wherein the rotating electrical machine protection ring is formed by annularly winding a strip or sheet material impregnated with a reinforcing fiber multiple times to form a cylindrical laminate, and then molding the laminate. In the winding end region of the laminate, a fiber pressing tool is inserted into the layers from the outermost layer to the inner peripheral side layer, so that the fiber constituting the strip or sheet material in the outer peripheral side layer including the outermost layer invades the inner peripheral side layer.

5. A method for manufacturing a rotating electrical machine protection ring, wherein the rotating electrical machine protection ring is formed by annularly winding a strip or sheet material impregnated with a reinforcing fiber multiple times to form a cylindrical laminate, and then molding the laminate. In the winding end region of the laminate, the fiber constituting the strip or sheet material and an auxiliary wire are stitched across multiple layers from the outermost layer to the inner peripheral side layer, and the auxiliary wire is a fiber other than the fiber constituting the strip or sheet material.

6. A rotating electrical machine having the rotating electrical machine protection ring according to any one of claims 1 to 3, wherein the single unit output of the rotating electrical machine is 200 kW or more.

7. A rotating electrical machine having the rotating electrical machine protection ring according to any one of claims 1 to 3, wherein the single unit output density of the rotating electrical machine is 6 kW / kg or more.

8. An electric mobile device having the rotating electrical machine according to claim 6 or 7.

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