Method of supporting rotor core of shaft generator

Abstract

To provide a shaft generator that can perform emergency disconnection with simple work. [Solution] The motor comprises a cylindrical stator core 6 formed of laminated annular steel plates, a stator core pressing plate 80 provided at one and the other axial ends of the stator core 6 and holding the stator core 6 by clamping it in the axial direction, a cylindrical rotor core 3 provided on the inner periphery of the stator core 6 and having an axial length longer than the stator core 6, an intermediate shaft 1 provided on the inner periphery of the rotor core 3 and fastened to the rotor core 3, and a gap material 100 inserted between both axial ends of the rotor core 3 and the stator core pressing plate 80 during emergency cutting to separate the intermediate shaft 1 and the rotor core 3.

Description

[Technical field]

[0001] The present invention relates to a shaft generator used on ships and the like. [Background technology]

[0002] The structure of a conventional permanent magnet type shaft generator will be described with reference to Fig. 1. In a shaft generator, a cylindrical intermediate shaft 1 is disposed on the inner circumference of a cylindrical rotor core 3, and the rotor core 3 is fixed to the intermediate shaft 1 by fastening an intermediate shaft flange 2 protruding from the outer circumference of the intermediate shaft 1 to a rotor core flange 4 protruding from the inner circumference of the rotor core 3 with bolts (not shown). A permanent magnet 5 is attached to the outer circumference of the rotor core 3.

[0003] A cylindrical stator core 6 is disposed on the outer periphery of the rotor core 3, and the stator core 6 is held by a stator frame 7. The stator core 6 is formed of steel plates laminated in the axial direction (left-right direction in the figure). The stator core 6 is sandwiched from both axial ends by stator core holding plates 8, which are disposed on one and the other axial ends, and the laminated steel plates are held in place so as not to shift.

[0004] Furthermore, the stator core 6 is provided with slots (not shown) that penetrate in the axial direction, and these slots house stator windings 9 made of copper wire. The shaft generator has this structure, and is designed to generate electromotive force by electromagnetic induction between the stator windings 9 and the permanent magnets 5.

[0005] In such shaft generators, in the event of an emergency such as a malfunction, it is necessary to quickly prevent the generation of electromotive force. For this reason, in the event of an emergency, the bolts fastening the intermediate shaft flange 2 and the rotor core flange 4 are removed, and the intermediate shaft 1 and the rotor core 3 are separated. This is called emergency disconnection.

[0006] In a shaft generator, the rotor core 3 is held only by the intermediate shaft 1, so in the event of an emergency disconnection, the rotor core 3 is supported by inserting a gap material 10 into the gap between the rotor core 3 and the stator core 6, as shown in Fig. 1, to prevent the rotor core 3 from falling off. For example, Patent Document 1 listed below is a publicly known document relating to a rotor supporting method. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] U.S. Patent Publication No. 2023 / 0163668 Summary of the Invention [Problem to be solved by the invention]

[0008] In the support method of Patent Document 1, the rotor core is fixed to the stator core by a member inserted between the rotor core and the stator core to ensure strong fixing not only during emergency cutting but also during transportation. However, since this is fastened with many bolts, the work is complicated in the event of emergency cutting or transportation.

[0009] The present invention has been made to solve the above problems, and provides a shaft generator that allows emergency disconnection with simple operations. Rotor core support method The purpose is to provide. [Means for solving the problem]

[0010] In order to achieve the above object, a shaft generator according to the present invention Rotor core support method the rotor core includes a cylindrical stator core formed of laminated annular steel plates, stator core presser plates provided at one and the other axial ends of the stator core for axially sandwiching and holding the stator core, a cylindrical rotor core provided on the inner periphery of the stator core and having an axial length longer than the stator core, and an intermediate shaft provided on the inner periphery of the rotor core and fastened to the rotor core, In a shaft generator comprising:In an emergency disconnection to separate the intermediate shaft from the rotor core, a gap is provided between both ends of the rotor core in the axial direction and the stator core pressing plate. Gap material Insert do .

[0011] In the event of emergency disconnection, the rotor core separated from the intermediate shaft can be supported by the gap material inserted between both axial ends of the rotor core and the stator core pressing plate, preventing the rotor core from rotating or falling off. Moreover, emergency disconnection can be performed by the simple operation of inserting the gap material between both axial ends of the rotor core and the stator core pressing plate, and then disconnecting the intermediate shaft from the rotor core. Effect of the Invention

[0012] According to the present invention, a shaft generator capable of performing emergency disconnection with simple operations is provided. Rotor core support method can be provided. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view showing an example of the configuration of a conventional shaft generator. [Diagram 2] 1 is a cross-sectional view showing a configuration example of a shaft generator according to a first embodiment. [Diagram 3] 2 is an enlarged view of a spacer provided in the rotating electric machine according to the first embodiment. FIG. [Figure 4] 1 is a perspective view showing the appearance of a gap member according to a first embodiment. FIG. [Diagram 5] FIG. 11 is a perspective view showing the appearance of a gap member according to a second embodiment. [Figure 6] FIG. 11 is a perspective view showing the appearance of a gap member according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] 1. First embodiment First, a first embodiment of the present invention will be described. Fig. 2 is a cross-sectional view showing a configuration example of a shaft generator 20 according to the first embodiment, and Fig. 3 is an outside diameter diagram of a stator core retainer plate 80 provided in the shaft generator 20. This shaft generator 20 is a permanent magnet type shaft generator used on ships and the like, and an intermediate shaft 1 is connected to a rotating shaft of a main engine that drives a propeller of the ship, for example.

[0016] As shown in FIG. 2, the shaft generator 20 has a cylindrical intermediate shaft 1 disposed inside a cylindrical rotor core 3, and an intermediate shaft flange 2 provided so as to protrude from the outer periphery of the intermediate shaft 1 and a rotor core flange 4 provided so as to protrude from the inner periphery of the rotor core 3 are fastened with bolts (not shown) to fix the rotor core 3 to the intermediate shaft 1. A permanent magnet 5 is attached integrally to the outer periphery of the rotor core 3. As shown in FIG. 2, the permanent magnet 5 is not attached to one end and the other end of the rotor core 3 in the axial direction (left and right direction in the figure). In other words, the permanent magnet 5 is attached integrally to the outer periphery of the rotor core 3 except for both ends in the axial direction. For this reason, the permanent magnet 5 attached to the outer periphery of the rotor core 3 is one step higher than the outer periphery of both ends in the axial direction of the rotor core 3.

[0017] A cylindrical stator core 6 is disposed on the outer periphery of the rotor core 3, and the stator core 6 is held by a stator frame 7. The stator core 6 is formed of annular steel plates laminated in the axial direction (left-right direction in the figure). The stator core 6 is sandwiched from both axial ends by two stator core pressing plates 80 disposed at one and the other axial ends, and is held integrally with the two stator core pressing plates 80. The stator core pressing plates 80 are annular members having inner and outer diameters approximately the same as those of the steel plates forming the stator core 6.

[0018] The axial length of the rotor core 3 is approximately equal to the sum of the axial length of the stator core 6 and the axial length of the two stator core pressing plates 80. The axial length of the portion of the rotor core 3 to which the permanent magnets 5 are attached is approximately equal to the axial length of the stator core 6. The rotor core 3 is fixed to the intermediate shaft 1 such that the portion to which the permanent magnets 5 are attached is located on the inner periphery of the stator core 6, and both axial ends (i.e., the portions to which the permanent magnets 5 are not attached) are located on the inner periphery of the stator core pressing plates 80.

[0019] Furthermore, groove-like slots (not shown) that penetrate in the axial direction are provided radially in the inner periphery of the stator core 6 when viewed from the axial direction. Also, as shown in Fig. 3, groove-like slots 12 that penetrate in the axial direction are provided radially in the inner periphery of the stator core presser plate 80 as well, similar to the stator core 6. The slots 12 of the stator core presser plate 80 and the slots of the stator core 6 are connected to each other, and the slots of the stator core 6 and the slots of the stator core presser plate 80 house stator windings 9 (Fig. 2) made of copper wire.

[0020] 3, the stator core retaining plate 80 has projections called teeth (hereinafter referred to as teeth) 13 between the radially arranged slots 12, and the stator windings 9 (FIG. 2) are wound around these teeth 13. The shaft generator 20 has this kind of structure, and when the intermediate shaft 1 shown in FIG. 2 rotates, an electromotive force is generated by electromagnetic induction between the stator windings 9 and the permanent magnets 5.

[0021] In this shaft generator 20, in the event of an emergency such as a malfunction, the bolts fastening the intermediate shaft flange 2 and the rotor core flange 4 are removed, and the intermediate shaft 1 and the rotor core 3 are separated for emergency disconnection.

[0022] During this emergency disconnection, as shown in Figure 2, in the axial generator 20, in order to prevent the rotor core 3 from falling off, a non-magnetic gap material 100 is inserted into the gap between the outer peripheral surface of one axial end of the rotor core 3 and the inner peripheral surface (more specifically, the tips of the teeth 13) of the stator core pressing plate 80 provided on one axial end side of the stator core 6, and the rotor core 3 is supported by inserting a non-magnetic gap material 100 into the gap between the outer peripheral surface of the other axial end of the rotor core 3 and the inner peripheral surface (more specifically, the tips of the teeth 13) of the stator core pressing plate 80 provided on the other axial end side of the stator core 6.

[0023] 4, the gap material 100 is a ring-shaped (annular) member with an inner diameter that is approximately equal to the outer diameter of both axial ends of the rotor core 3, and an outer diameter that is approximately equal to the inner diameter of the stator core pressing plate 80. In addition, the length of the gap material 100 in the axial direction (left-right direction in the figure) is approximately equal to the axial length of the stator core pressing plate 80, as shown in FIG.

[0024] As described above, permanent magnets 5 are attached to the outer peripheral surface of the rotor core 3 except for both axial ends, and these permanent magnets 5 are one step higher than the outer peripheral surface of the rotor core 3 at both axial ends.

[0025] For this reason, for example, when the gap material 100 is inserted into the gap between the stator core pressing plate 80 and the rotor core 3 from one axial end side of the stator core 6, the gap material 100 comes into contact with the permanent magnet 5 and cannot be inserted any further. Similarly, at the other axial end side of the stator core 6, when the gap material 100 comes into contact with the permanent magnet 5, it cannot be inserted any further.

[0026] This is because if the gap material 100 inserted into the gap between the stator core pressing plate 80 and the rotor core 3 reaches the stator core 6, which is located behind the stator core pressing plate 80, the rotor core 3 will be supported by the stator core 6 and the gap material 100, which may cause the laminated steel plates that form the stator core 6 to deform or shift.

[0027] In other words, the permanent magnet 5 also functions as a stopper to prevent the gap material 100 from reaching the stator core 6 when the gap material 100 is inserted into the gap between the stator core pressing plate 80 and the rotor core 3. As a result, in the shaft generator 20, the rotor core 3 can be supported by the gap material 100 inserted into the gap between the stator core pressing plate 80 and the rotor core 3, and the stator core pressing plate 80, and deformation or displacement of the laminated steel plates that form the stator core 6 can be prevented.

[0028] As described above, the axial generator 20 of the first embodiment includes a cylindrical stator core 6 formed of laminated annular steel plates, stator core pressing plates 80 provided at one and the other axial ends of the stator core 6 for clamping and holding the stator core 6 in the axial direction, a cylindrical rotor core 3 provided on the inner periphery of the stator core 6 and having an axial length longer than the stator core 6, an intermediate shaft 1 provided on the inner periphery of the rotor core 3 and fastened to the rotor core 3, and gap members 100 inserted between both axial ends of the rotor core 3 and the stator core pressing plates 80 during emergency disconnection to separate the intermediate shaft 1 from the rotor core 3.

[0029] In the shaft generator 20, in the event of emergency disconnection, the rotor core 3 separated from the intermediate shaft 1 can be supported by the gap material 100 inserted between both axial ends of the rotor core 3 and the stator core pressing plate 80, and the rotor core 3 can be prevented from rotating or falling off. In addition, in the shaft generator 20, emergency disconnection can be performed by inserting the gap material 100 between the rotor core 3 and the stator core pressing plate 80 to support the rotor core 3, and then disconnecting the intermediate shaft 1 from the rotor core 3. This makes it possible to perform emergency disconnection with simpler work than, for example, the conventional case in which the rotor core is fixed to the stator core with many bolts and then the intermediate shaft and the rotor core are disconnected. Thus, in the first embodiment, it is possible to provide a shaft generator 20 that allows emergency disconnection to be performed with simple work.

[0030] Furthermore, in the shaft generator 20, a gap material 100 is inserted into the gap between the rotor core 3 and the stator core pressing plate 80, so that the rotor core 3 is supported by the stator core pressing plate 80 and the gap material 100, thereby preventing the laminated steel plates that form the stator core 6 from deforming or shifting.

[0031] Furthermore, in the axial generator 20, the permanent magnets 5 are attached to the outer circumferential surface of the rotor core 3 except for both axial ends, and the permanent magnets 5 are one step higher than the outer circumferential surface of both axial ends of the rotor core 3. In this way, when the gap material 100 is inserted into the gap between the stator core pressing plate 80 and the rotor core 3, the permanent magnets 5 act as a stopper, preventing the gap material 100 from being inserted up to the inner circumferential side of the stator core 6.

[0032] 2. Second embodiment Next, a second embodiment of the present invention will be described. In this second embodiment, the shape of the gap member 100 is different from that of the first embodiment, and the configuration other than the gap member 100 is the same as that of the first embodiment, so the description will be omitted. In order to distinguish it from the first embodiment, the gap member 100 of the second embodiment will be referred to as gap member 200.

[0033] Fig. 5 shows the appearance of the gap member 200. This gap member 200 is obtained by dividing a ring-shaped member equivalent to the gap member 100 of the first embodiment shown in Fig. 4 into a plurality of (for example, four) parts 200P in the circumferential direction. In this way, in the second embodiment, by dividing the gap member 200 into a plurality of parts 200P, each of the parts 200P, which is smaller and lighter than the gap member 100 of the first embodiment, can be inserted into the gap between the stator core pressing plate 80 and the rotor core 3, thereby improving the workability during insertion.

[0034] For example, in the case of the first embodiment, when inserting the gap material 100, it is necessary to keep the gap material 100 passing through the intermediate shaft 1, but in the case of the second embodiment, since the gap material 200 is divided into multiple parts 200P, this kind of work can be omitted.

[0035] 3. Third embodiment Next, a third embodiment of the present invention will be described. In this third embodiment, the shape of the gap member 100 is different from that of the first and second embodiments, and the configuration other than the gap member 100 is the same as that of the first embodiment, so the description will be omitted. In order to distinguish it from the first and second embodiments, the gap member 100 of the third embodiment will be referred to as gap member 300.

[0036] Fig. 6 shows the appearance of the gap member 300. Similar to the gap member 200 of the second embodiment, the gap member 300 is a ring-shaped member divided into a plurality of parts 300P in the circumferential direction, and Fig. 6 shows only one of the parts 300P.

[0037] 6, part 300P is provided on its outer periphery with fixing parts 301 for fixing part 300P to stator core holding plate 80 with a fastener (e.g., a bolt). Furthermore, fixing parts 301 of part 300P are provided with through holes 301H for bolts, while teeth 13 of stator core holding plate 80 are provided with screw holes for bolts (not shown).

[0038] In this third embodiment, part 300P is inserted into the gap between the stator core pressing plate 80 and the rotor core 3, and part 300P is fixed to the stator core pressing plate 80 by fastening the fixing portion 301 of part 300P to the teeth 13 of the stator core pressing plate 80 with a bolt.

[0039] In this way, in the third embodiment, each component 300P of the gap material 300 can be fixed to the stator core pressing plate 80, thereby preventing the gap material 300 from becoming detached and falling off, and supporting the rotor core 3 more safely.

[0040] [4. Other embodiments] Next, another embodiment (modification) of the present invention will be described. In the above-mentioned third embodiment, the fixing portion 301 for fixing the part 300P of the gap member 300 to the stator core pressing plate 80 is provided on the outer periphery of the part 300P of the gap member 300, but similarly, in the first embodiment, the fixing portion for fixing the gap member 100 to the stator core pressing plate 80 may be provided on the outer periphery of the gap member 100.

[0041] Furthermore, without being limited thereto, a fixing portion for fixing the part 300P to the rotor core 3 may be provided on the inner periphery of the part 300P of the gap material 300. In this way, each part 300P of the gap material 300 can be fixed to the stator core pressing plate 80 and the rotor core 3. Similarly, in the first embodiment, a fixing portion for fixing the gap material 100 to the rotor core 3 may be provided. Note that the fixing portion 301 may be removed from the part 300P, and only the fixing portion for fixing to the rotor core 3 may be provided.

[0042] Furthermore, in each of the above-described embodiments, the present invention is applied to the shaft generator 20, which is a permanent magnet shaft generator used on ships, etc. However, the present invention is not limited to this, and may be applied to a shaft generator having a configuration partially different from that of each of the above-described embodiments, so long as the shaft generator has a configuration in which the rotor core is held only by the intermediate shaft and the intermediate shaft is separated from the rotor core in the event of emergency disconnection, etc.

[0043] Furthermore, the present invention is not limited to the above-described embodiments, and the scope of application of the present invention extends to any combination of the first to third embodiments and any part or whole of the other embodiments, or to any embodiment in which a part is extracted. [Industrial Applicability]

[0044] The present invention can be widely used in permanent magnet shaft generators used on ships and the like, for example. [Explanation of symbols]

[0045] 1...intermediate shaft, 2...intermediate shaft flange, 3...rotor core, 4...rotor core flange, 5...permanent magnet, 6...stator core, 7...stator frame, 8, 80...stator core retainer plate, 9...stator winding, 10, 100, 200, 300...gap material, 12...slot, 13...teeth, 20...shaft generator, 200P, 300P...parts, 301...fixed part, 301H...through hole.

Claims

1. a cylindrical stator core formed of laminated annular steel plates; a stator core pressing plate provided at one end side and the other end side of the stator core in an axial direction, the stator core being sandwiched and held in place in the axial direction; a cylindrical rotor core provided on an inner circumferential side of the stator core and having an axial length longer than that of the stator core; an intermediate shaft provided on an inner circumferential side of the rotor core and fastened to the rotor core; In a shaft generator comprising: In an emergency disconnection to separate the intermediate shaft from the rotor core, a gap member is inserted between both axial ends of the rotor core and the stator core pressing plate. A method for supporting a rotor core of a shaft generator, comprising:

2. The stator core has an inner circumferential portion provided with a groove-shaped slot penetrating therethrough in the axial direction, The stator core retainer plate has an inner circumferential portion provided with groove-shaped slots communicating with the slots of the stator core, A stator winding is housed in the slots of the stator core and the slots of the stator core pressing plate, The gap material is The rotor core is inserted into a gap between an outer peripheral surface of one end of the rotor core in the axial direction and an inner peripheral surface of the stator core pressing plate provided on one end of the stator core in the axial direction, and the rotor core is inserted into a gap between an outer peripheral surface of the other end of the rotor core in the axial direction and an inner peripheral surface of the stator core pressing plate provided on the other end of the stator core in the axial direction.

2. A method for supporting a rotor core of a shaft generator according to claim 1.

3. The gap material is It is a ring-shaped component.

3. A method for supporting a rotor core of a shaft generator according to claim 2.

4. The gap material is The gap material is divided into multiple parts in the circumferential direction.

4. A method for supporting a rotor core of a shaft generator according to claim 3.

5. A fixing portion for fixing the gap material to the stator core pressing plate is provided on the outer periphery of the gap material.

5. A method for supporting a rotor core of a shaft generator according to claim 3 or 4.

6. A fixing portion for fixing the gap material to the rotor core is provided on the inner periphery of the gap material.

5. A method for supporting a rotor core of a shaft generator according to claim 3 or 4.

7. A permanent magnet is attached to the outer circumferential surface of the rotor core except for both axial ends, The permanent magnet attached to the outer circumferential surface of the rotor core is one step higher than the outer circumferential surfaces at both ends of the rotor core in the axial direction, and functions as a stopper to prevent the gap material from reaching the stator core when the gap material is inserted.

2. A method for supporting a rotor core of a shaft generator according to claim 1.

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