Interpolar connection structure of medium-large low-rotating-speed hydraulic generator

Abstract

The utility model provides an interpolar connection structure of a medium-large low-rotating-speed hydraulic generator, which comprises a rotor support, a magnet yoke connected with the rotor support, and a plurality of magnetic poles connected on the magnet yoke, the magnetic poles are wound with magnetic pole coils, and adjacent magnetic poles are connected with each other through the interpolar connection structure. The ends, close to the rotor support, of the magnetic poles are magnetic pole lower ends, the ends, away from the rotor support, of the magnetic poles are magnetic pole upper ends, and the magnetic pole upper ends and the magnetic pole lower ends of the interelectrode connecting structures are alternately arranged between the multiple magnetic poles. According to the interpolar connection structure of the medium-large low-rotating-speed hydraulic generator, the connection structure between magnetic poles is simplified, the structure is simple and easy to install, the manufacturing cost is relatively low, and the problem that in the prior art, a lead of an interpolar connection structure is too long, insulation damage is prone to occurring in the operation process, and consequently a rotor is grounded is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydro-generators, in particular to an inter-pole connection structure for medium and large-sized low-speed hydro-generators. Background Art

[0002] The inter-pole connection of a hydro-generator connects each pole coil through a conductive connecting piece to form a closed current loop. The inter-pole connection method is crucial for the normal operation of the hydro-generator, and it affects the electromagnetic performance and mechanical performance of the entire unit. The inter-pole connecting wire is an important rotating component of the hydro-generator, and it will be subjected to complex forces during the operation of the hydro-generator. Its deformation and stress state will directly affect the normal operation of the unit.

[0003] For example, in a Chinese patent, a novel inter-pole connection structure for the rotor of a bulb tubular hydro-generator with the publication number of CN205791883U is composed of a nut, a single-ear stop washer, a backing plate, an inter-pole connecting plate, a tensioning screw, an I-shaped insulator, and a bolt. The I-shaped insulator is bolted to the yoke ring, and the nut, single-ear stop washer, backing plate, and inter-pole connecting plate connect and lock the pole leads and are fixed on the I-shaped insulator with a tensioning screw. The inter-pole connection structure mentioned in the above utility model is relatively simple, but the manufacturing cost is relatively high, and the lead length is relatively long, there is a hidden danger of rotor grounding caused by lead insulation damage. Summary of the Utility Model

[0004] Aiming at the problems in the prior art that the manufacturing cost of the inter-pole connection structure of the hydro-generator is relatively high, and the length of the inter-pole leads is relatively long, which is prone to lead insulation damage and cause the hidden danger of rotor grounding, the utility model proposes a structure that is simple and easy to install, with relatively low manufacturing cost, and is not prone to lead insulation damage and cause rotor grounding problems.

[0005] In order to achieve the above technical effects, the utility model proposes:

[0006] An inter-pole connection structure for a medium and large-sized low-speed hydro-generator, comprising a rotor bracket, a yoke connected to the rotor bracket, and further comprising a plurality of magnetic poles connected to the yoke. The magnetic poles are wound with magnetic pole coils. Adjacent magnetic poles are interconnected through an inter-pole connection structure. One end of the magnetic pole close to the rotor bracket is the lower end of the magnetic pole, and the end of the magnetic pole far from the rotor bracket is the upper end of the magnetic pole. The inter-pole connection structure is alternately arranged between the upper ends and the lower ends of the plurality of magnetic poles. The inter-pole connection structure of the present utility model is arranged between the magnetic poles and is alternately arranged between the lower ends of a plurality of magnetic poles close to the rotor bracket and the upper ends of the magnetic poles far from the rotor bracket. Each magnetic pole is connected in series through the inter-pole connection structure to form a loop. The inter-pole connection structure has the property of conductivity, and there is no need to additionally arrange leads in the prior art to connect two adjacent magnetic poles in series, avoiding the problem of rotor grounding caused by the damage of the lead insulation layer. At the same time, the inter-pole connection structure of the present utility model has a relatively simple structure, is easy to install, and has a low manufacturing cost.

[0007] The inter-pole connection structure includes an upper-end connection structure and a lower-end connection structure. The upper-end connection structure is arranged between the upper ends of adjacent magnetic poles, and the lower-end connection structure is arranged between the lower ends of adjacent magnetic poles. The inter-pole connection structure includes an upper-end connection structure arranged at the upper ends of the magnetic poles and a lower-end connection structure arranged at the lower ends of the magnetic poles. The upper-end connection structure and the lower-end connection structure are alternately arranged between the magnetic poles.

[0008] The upper-end connection structure includes fixing plates oppositely arranged at the upper ends of two magnetic poles. A fixing plate through-hole is provided on the end face of the fixing plate extending out of the top of the magnetic pole. It further includes a fixing plate connecting plate, and a fixing plate connecting plate through-hole corresponding to the fixing plate through-hole is provided on the fixing plate connecting plate. The two fixing plates are fixedly connected to the fixing plate connecting plate through bolts. The upper-end connection structure includes two fixing plates oppositely arranged at the upper ends of two adjacent magnetic poles. The fixing plates are metal plates, and the fixing plates are fixedly connected to the upper ends of the magnetic poles. One end of the fixing plate is fixed, and the other end extends out of the upper end of the magnetic pole. A through-hole is opened on the end face of the extending end of the magnetic pole for the mutual connection of the two fixing plates. The fixing plate connecting plate is a metal plate in the shape of a sheet, and its length corresponds to the width of the part of the fixing plate extending out of the upper end of the magnetic pole. Two through-holes corresponding to the fixing plate through-holes are provided on the surface, and the two fixing plates are connected by bolts.

[0009] The two oppositely arranged fixing plates are arranged in an up-and-down fitting manner, and the two fixing plate through-holes are correspondingly arranged. The parts of the two fixing plates extending out of the upper ends of the magnetic poles are arranged in an up-and-down fitting manner, and the through-holes correspond to each other. The two fixing plates are connected by the fixing plate connecting plate and bolts.

[0010] The lower end connection structure includes folding plates oppositely arranged at the lower ends of the two magnetic poles. A folding plate through hole is provided on one end face of the folding plate extending out of the lower end of the magnetic pole. It further includes a folding plate connecting plate, and a folding plate connecting plate through hole corresponding to the folding plate through hole is provided on the folding plate connecting plate. The two folding plates are fixedly connected to the folding plate connecting plate by bolts. The lower end connection structure includes two folding plates oppositely arranged at the lower ends of two adjacent magnetic poles. One end of the folding plate is fixed to the lower end of the magnetic pole. The folding plate is a metal plate, and the folding plate is fixedly connected to the lower end of the magnetic pole. One end of the folding plate is fixed, and the other end extends out of the lower end of the magnetic pole. A through hole is provided on the end face of the end extending out of the magnetic pole for the mutual connection of the two folding plates; the folding plate connecting plate is a metal plate, and a through hole corresponding to the folding plate through hole is provided on the surface. The two folding plates and the folding plate connecting plate are connected by bolts.

[0011] The folding plate has a bend, and the folding plate connecting plate has a bend. The lower end connection structure is close to the yoke, and it is inconvenient to install. The length of the folding plate extending out is adjusted appropriately and bent towards the radial direction of the rotor bracket. The positions of the two folding plates are set at a certain angle, and the folding plate connecting plate is provided with a bend to facilitate installation.

[0012] A gasket is provided between the bolt head and any one of the connecting parts, and the gasket is subjected to flanging reinforcement treatment.

[0013] The upper end connection structure and the lower end connection structure are arranged on the opposite side surfaces of the magnetic pole.

[0014] The beneficial effects of the present utility model are as follows:

[0015] The pole connection structure of the medium and large-sized low-speed hydro-generator proposed by the present utility model simplifies the connection structure between the magnetic poles. Through the connection structure arranged between the magnetic poles, several magnetic poles are connected in series into a loop. The structure is simple and easy to install, the manufacturing cost is relatively low, and it avoids the problem that the lead wire of the pole connection structure in the prior art is too long and is prone to insulation damage during operation, resulting in rotor grounding. Description of the Drawings

[0016] Figure 1 It is the overall structure schematic diagram of the pole connection structure of the medium and large-sized low-speed hydro-generator.

[0017] Figure 2 It is the structure schematic diagram of the mutual connection of partial magnetic poles.

[0018] Figure 3 It is Figure 2 The schematic diagram in the A direction in

[0019] Figure 4 It is Figure 3 The sectional view at B-B in

[0020] Figure 5 It isFigure 2 Schematic diagram in the C direction.

[0021] Figure 6 is Figure 5 Schematic diagram in the D direction.

[0022] Figure 7 Schematic diagram of the top view direction of the magnetic pole.

[0023] Reference numerals in the drawings:

[0024] 1. Rotor bracket; 2. Yoke; 3. Magnetic pole; 4. Inter-pole connection structure; 5. Magnetic pole coil; 6. Gasket; 31. Upper end of the magnetic pole; 32. Lower end of the magnetic pole; 41. Upper connection structure; 42. Lower connection structure; 61. Flange; 411. Fixed plate; 412. Fixed plate connecting plate; 413. Through hole of the fixed plate; 414. Through hole of the fixed plate connecting plate; 421. Folding plate; 422. Folding plate connecting plate; 423. Through hole of the folding plate; 424. Through hole of the folding plate connecting plate. Detailed implementation manners

[0025] The following specific embodiments illustrate the implementation manners of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0026] The present invention provides an inter-pole connection structure for a medium and large-sized low-speed hydro-generator, and the following describes the preferred embodiments of the inter-pole connection structure for a medium and large-sized low-speed hydro-generator.

[0027] Embodiment 1

[0028] As Figure 1 shown, the inter-pole connection structure 4 in Embodiment 1 of the medium and large-sized low-speed hydro-generator includes a rotor bracket 1, the outer ring of the rotor bracket 1 is connected to a yoke 2, a plurality of magnetic poles 3 are connected to the yoke 2, a magnetic pole coil 5 is wound around the magnetic poles 3, an inter-pole connection structure 4 is arranged between each adjacent magnetic pole 3, the inter-pole connection structure 4 connects the magnetic poles 3 in series, the inter-pole connection structure 4 is made of metal and has certain electrical conductivity, and at this time, the magnetic poles 3 are connected in series to form a loop. Through holes and counterbores are arranged on the inner circumferential surface of the yoke 2, and corresponding threaded holes are arranged on the end surface where the magnetic poles 3 are connected to the yoke 2, and bolts are used to connect the magnetic poles 3 to the yoke 2.

[0029] As Figure 2As shown, the inter-pole connection structure 4 includes an upper-end connection structure 41 disposed at the upper end 41 of the magnetic pole (the end of the magnetic pole 3 away from the rotor bracket 1) and a lower-end connection structure 42 disposed at the lower end 42 of the magnetic pole (the end of the magnetic pole 3 close to the rotor bracket 1). The upper-end connection structure 41 and the lower-end connection structure 42 are spaced apart between the magnetic poles 3, and the upper-end connection structure 41 and the lower-end connection structure 42 are located on different sides of the hydro-generator. For the two magnetic poles 3 for connecting the generator electrode wires, that is, there is no inter-pole connection structure 4 between the head and the tail of the entire magnetic pole 3 loop. There is an upper-end connection structure 41 between the head and the tail of the magnetic pole 3 loop and the adjacent magnetic poles 3.

[0030] As Figure 3 and Figure 4 shown, the upper-end connection structure 41 includes two fixing plates 411 disposed at the upper ends 41 of adjacent magnetic poles. The fixing plates 411 can be welded to the upper ends 41 of the magnetic poles after the magnetic poles 3 are manufactured. The fixing plates 411 are sheet-shaped and have a certain bending angle in the horizontal direction. The bending angles of the paired fixing plates 411 are symmetrically arranged for easy installation. One end of each is welded to the upper end 41 of the magnetic pole, and the other end extends out of the upper end 41 of the magnetic pole. Two holes are opened along the width direction on the end face extending out of the upper end 41 of the magnetic pole. The paired fixing plates 411 are symmetrically arranged at the upper ends 41 of two adjacent magnetic poles. The upper-end connection structure 41 further includes a fixing plate connecting plate 412 that connects the two fixing plates 411. Its length is the same as the width of the end of the fixing plate 411 extending out of the upper end 41 of the magnetic pole. The fixing plate connecting plate 412 is provided with two fixing plate connecting plate through holes 414 corresponding to the fixing plate through holes 413. The two fixing plate connecting plate through holes 414 are processed into two screw holes. The thickness of the fixing plate connecting plate 412 is designed according to the size of the bolts. One end of the fixing plate through holes 413 of the two fixing plates 411 is arranged vertically, and the two fixing plate through holes 413 are oppositely arranged. Two bolts are used to connect the two fixing plates 411 and the fixing plate connecting plate 412. A gasket 6 is disposed between the head of the bolt and the fixing plate 411. Its size is similar to that of the fixing plate connecting plate 412 and smaller than the fixing plate connecting plate 412. After the bolt connection is completed, the two corners 61 on one side of the gasket 6 are flanged to fix the head of the bolt. The fixing plate connecting plate 412 is a Q235 steel plate. The upper-end connection structure 41 can withstand a certain amount of current and voltage, and the magnitude is the same as that of the current and voltage borne by the magnetic pole coil 5.

[0031] As Figure 5 and Figure 6As shown, the lower end connection structure 42 includes a folded plate 421 provided at the lower end 42 of adjacent magnetic poles. The folded plate 421 can be welded to the lower end 42 of the magnetic pole after the magnetic pole 3 is manufactured. The folded plate 421 is in the shape of a long strip and has a 90° bend in the middle. One end is welded to the lower end 42 of the magnetic pole, and the other end faces the center of the rotor bracket 1. Two folded plate through holes 423 are provided in this section. The paired folded plates 421 are arranged at a certain angle when set, not parallel, which is convenient for installation. The lower end connection structure 42 further includes a folded plate connection plate 422 that connects the two folded plates 421. It has a bend in the middle, and the bending angle is the same as the relative angle of the two paired folded plates 421. Two folded plate connection plate through holes 424 opposite to the folded plate through holes 423 are provided at each of the two ends after folding. During installation, four pairs of bolts and nuts are used to connect the two folded plates 421 to the folded plate connection plate 422 respectively, and the folded plate 421 is located on the side away from the magnetic pole 3. A gasket 6 is provided between each of the two ends of the crease of the folded plate connection plate 422 and the head of the bolt. The two corners 61 on one side of the gasket 6 are flanged to reinforce the head of the bolt. The folded plate connection plate 422 is made of pure copper, and tinned treatment is performed at both ends connected to the folded plate 421 to enhance certain electrical conductivity and anti-oxidation and corrosion resistance.

[0032] As Figure 7As shown, the upper connection structure 41 and the lower connection structure 42 are alternately arranged between the upper ends 41 of adjacent magnetic poles and the lower ends 42 of the magnetic poles. The fixing plate 411 and the folding plate 421 are welded to the magnetic pole 3 in pairs. Since the gap between the magnetic poles 3 is very small, it is convenient to install the upper connection structure 41 at the upper end 41 of the magnetic pole, while it is inconvenient to fix the fixing bolts at the lower end 42 of the magnetic pole. Moreover, the design of the fixing plate connecting plate 412 avoids the inconvenience of installing the nut between the gaps of the magnetic poles 3, and the manufacturing cost of the fixing plate connecting plate 412 is low and will not increase the manufacturing cost; the gap between the lower ends 42 of the magnetic poles is narrower than that between the upper ends 41 of the magnetic poles. The lead-out structure such as the lower connection structure 42 facilitates the fixed connection of the bolts. The angle set between the folding plates 421 facilitates the installation of the folding plate connecting plate 422. The folding plate through hole 423 limits the width of the folding plate connecting plate 422 connecting the two folding plates 421, reduces the resistance between the two folding plates 421, and improves the electrical conductivity of the folding plate connecting plate 422; the material of the folding plate connecting plate 422 is pure copper, with a bend in the middle, and the bending angle is the same as the angle of the two paired folding plates 421. The two sections of the folding plate connecting plate 422 connected to the folding plate 421 are tinned to improve the electrical conductivity and anti-oxidation and corrosion resistance. During the operation of the hydro-generator, the components and connection structures between the magnetic poles 3 will be affected by centrifugal force. In the prior art, the lead support between the magnetic poles 3 is arranged on the rotor support 1. The leads are easily damaged by insulation due to long-term centrifugal action, resulting in rotor grounding accidents. In the present utility model, the magnetic poles 3 are connected by an inter-pole connection structure of a mechanical structure, which is composed of a metal material and can directly replace the role of the leads, avoiding the possibility of lead insulation damage in the prior art. At the same time, the connection structure is simpler than the connection between the leads and the support, with higher efficiency during the installation of a large number of magnetic poles 3 and relatively lower manufacturing cost, having certain practical value.

[0033] Embodiment 2

[0034] The inter-pole connection structure 4 of the medium and large low-speed hydro-generator in Embodiment 2 includes a rotor support 1. The circumferential surface of the rotor support 1 is connected to the magnetic yoke 2. The outer circumferential surface of the magnetic yoke 2 is connected to a plurality of magnetic poles 3. The magnetic poles 3 are wound with magnetic pole coils 5. The magnetic poles 3 are connected in series through the inter-pole connection structure 4. The inter-pole connection structure 4 is alternately arranged between the lower ends 42 of the magnetic poles 3 close to the rotor support 1 and the upper ends far from the rotor support 1.

[0035] The inter-pole connection structure 4 includes an upper connection structure 41 provided at the upper end 41 of the magnetic pole (the end of the magnetic pole 3 away from the rotor bracket 1) and a lower connection structure 42 provided at the lower end 42 of the magnetic pole (the end of the magnetic pole 3 close to the rotor bracket 1). The upper connection structure 41 and the lower connection structure 42 are arranged at intervals between the magnetic poles 3, and the upper connection structure 41 and the lower connection structure 42 are located on different sides of the hydro-generator. For the two magnetic poles 3 for connecting the generator electrode wires, that is, there is no inter-pole connection structure 4 between the first and last magnetic poles 3 of the entire magnetic pole 3 loop, and an upper connection structure 41 is provided between the first and last magnetic poles 3 of the magnetic pole 3 loop and the adjacent magnetic poles 3. Different from the embodiment, in the second embodiment, the upper connection structure 41 and the lower connection structure 42 adopt the same structure.

[0036] As Figure 3 and Figure 4 shown, the upper connection structure 41 includes two fixing plates 411 provided at the upper ends 41 of adjacent magnetic poles. The fixing plates 411 can be welded to the upper ends 41 of the magnetic poles after the magnetic poles 3 are manufactured. The fixing plates 411 are in sheet form and have a certain bending angle in the horizontal direction. The bending angles of the paired fixing plates 411 are symmetrically arranged for easy installation. One end of each is welded to the upper end 41 of the magnetic pole, and the other end extends out of the upper end 41 of the magnetic pole. Two holes are opened along the width direction on the end face that extends out of the upper end 41 of the magnetic pole. The paired fixing plates 411 are symmetrically arranged at the upper ends 41 of two adjacent magnetic poles; the upper connection structure 41 further includes a fixing plate connecting plate 412 that connects the two fixing plates 411. Its length is the same as the width of the end of the fixing plate 411 that extends out of the upper end 41 of the magnetic pole. The fixing plate connecting plate 412 is provided with fixing plate connecting plate through holes 414 corresponding to the fixing plate through holes 413. The two fixing plate connecting plate through holes 414 are processed into threaded holes, and the thickness of the fixing plate connecting plate 412 is designed according to the size of the bolts; one end of the fixing plate through holes 413 of the two fixing plates 411 is arranged vertically, and the fixing plate through holes 413 of the two fixing plates 411 are oppositely arranged. Two bolts are used to connect the two fixing plates 411 and the fixing plate connecting plate 412; a gasket 6 is provided between the head of the bolt and the fixing plate 411. Its size is similar to that of the fixing plate connecting plate 412 and smaller than the fixing plate connecting plate 412. And after the bolt connection is completed, the two corners 61 on one side of the gasket 6 are flanged to fix the bolt head. The fixing plate connecting plate 412 is a Q235 steel plate. The upper connection structure 41 can withstand a certain amount of current and voltage, and the magnitude is the same as that of the current and voltage borne by the magnetic pole coil 5.

[0037] The lower-end connection structure 42 includes a folded plate 421 provided at the lower end 42 of adjacent magnetic poles. The folded plate 421 can be welded to the lower end 42 of the magnetic pole after the magnetic pole 3 is manufactured. The folded plate 421 is in the shape of a long strip and has a 90° bend in the middle. One end is welded to the lower end 42 of the magnetic pole, and the other end faces the center of the rotor bracket 1. Two folded-plate through holes 423 are provided in this section. The paired folded plates 421 are arranged at a certain angle when set, which is convenient for installation. When two magnetic poles 3 connected by the lower-end connection structure 42 are successively installed on the yoke 2, the ends of the paired folded plates 421 of the two magnetic poles 3 with the folded-plate through holes 423 are arranged opposite to each other, and the folded-plate through holes 423 are opposite to each other. The lower-end connection structure 42 further includes a folded-plate connecting plate 422 that connects the two folded plates 421. Its structure is the same as that of the fixed-plate connecting plate 412 and is provided with two threaded holes for fixedly connecting the folded plates 421. During installation, two bolts are used to connect the two folded plates 421 and the folded-plate connecting plate 422, and the folded plates 421 are located on the side close to the magnetic pole 3. A gasket 6 is provided between the folded plate 421 in contact with the bolt head and the bolt head, and the two corners 61 on one side of the gasket 6 are flanged to reinforce the head of the screw. The folded-plate connecting plate 422 is made of Q235 and can withstand a certain amount of current and voltage, and the magnitude is the same as that of the current and voltage borne by the magnetic-pole coil 5.

[0038] Comparing with the inter-pole connection structure 4 of the medium and large low-speed hydro-generator in Comparative Example 1, in Embodiment 2, the lower-end connection structure 42 uses the same connection structure as the upper-end connection structure 41. However, due to the small gap between the magnetic poles 3, the folded plate 421 is still set to have a bend to facilitate the fixed connection between the folded plates 421. Comparing with Comparative Example 1, the design of Embodiment 2 is simpler. The folded-plate connecting plate 422 of the lower-end connection structure 42 is set to have the same structure as the fixed-plate connecting plate 412 of the upper-end connection structure 41, which further simplifies the installation steps. The copper plate with four through holes and a bend is replaced with a Q235 steel plate with two threaded holes, shortening the installation time and reducing the manufacturing cost, which has practical significance in the installation process of a large number of magnetic poles 3.

Claims

1. An inter-pole connection structure for a medium and large-sized low-speed hydro-generator, comprising a rotor bracket and a yoke connected to the rotor bracket, characterized in that, It further includes a plurality of magnetic poles connected to the yoke, the magnetic poles are wound with magnetic pole coils, adjacent magnetic poles are interconnected through an inter-pole connection structure, one end of the magnetic pole close to the rotor bracket is the lower end of the magnetic pole, and one end of the magnetic pole far from the rotor bracket is the upper end of the magnetic pole. The inter-pole connection structure is alternately arranged between the upper ends and the lower ends of the plurality of magnetic poles.

2. The inter-pole connection structure of a medium and large-sized low-speed hydro-generator according to claim 1, wherein The inter-pole connection structure includes an upper-end connection structure and a lower-end connection structure. The upper-end connection structure is arranged between the upper ends of adjacent magnetic poles, and the lower-end connection structure is arranged between the lower ends of adjacent magnetic poles.

3. The inter-pole connection structure of a medium and large-sized low-speed hydrogenerator according to claim 2, wherein, The upper-end connection structure includes fixing plates oppositely arranged on the upper ends of two magnetic poles. A fixing plate through-hole is provided on one end face of the fixing plate extending out of the top end of the magnetic pole. It further includes a fixing plate connecting plate, and a fixing plate connecting plate through-hole corresponding to the fixing plate through-hole is provided on the fixing plate connecting plate. The two fixing plates are fixedly connected to the fixing plate connecting plate by bolts.

4. The inter-pole connection structure of a medium and large-sized low-speed hydro-generator according to claim 3, characterized in that, The two oppositely arranged fixing plates are arranged in an up-and-down fitting manner, and the two fixing plate through-holes are correspondingly arranged.

5. The inter-pole connection structure of a medium and large-sized low-speed hydro-generator according to claim 2, characterized in that, The lower-end connection structure includes folding plates oppositely arranged on the lower ends of two magnetic poles. A folding plate through-hole is provided on one end face of the folding plate extending out of the lower end of the magnetic pole. It further includes a folding plate connecting plate, and a folding plate connecting plate through-hole corresponding to the folding plate through-hole is provided on the folding plate connecting plate. The two folding plates are fixedly connected to the folding plate connecting plate by bolts.

6. The inter-pole connection structure of a medium and large-sized low-speed hydro-generator according to claim 5, characterized in that, The folding plate has a bend, and the folding plate connecting plate has a bend.

7. A pole connection structure for a medium and large-sized low-speed hydrogenerator according to any one of claims 3 to 6, characterized in that, A gasket is provided between the bolt head and any one of the connecting pieces, and the gasket is subjected to flanging reinforcement treatment.

8. The inter-pole connection structure of a medium and large-sized low-speed hydro-generator according to claim 2, characterized in that, The upper-end connection structure and the lower-end connection structure are arranged on opposite side surfaces of the magnetic pole.

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