Permanent magnet generator

Abstract

The invention relates to a permanent magnet generator, comprising: a base (1); the outer circle of a pressing ring of the stator (2) is in hot jacket interference fit with the base (1), so that a circumferential air duct is formed between the base (1) and the outer circle of an iron core of the stator (2); the rotor is positioned in the stator (2) and is provided with a rotor magnetic pole (4) with a fin ventilating duct; and the cooler (6) is arranged at the top of the base (1). Compared with the prior art, a novel air-water cooling mode is adopted, cooling water circulation is conducted outside the generator, air circulation is conducted inside the generator, the circulation inside the generator provides a pressure head through rotation of a rotor with a fin ventilation duct, and meanwhile the top drive fan at the top of the cooler further provides kinetic energy of an inner circulation air path.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, and in particular to a permanent magnet generator. Background Art

[0002] At present, permanent magnet generators in the industry generally use water jacket cooling for heat dissipation, but the water jacket cooling heat dissipation efficiency is low, and the corrosion prevention inside the water jacket is difficult to handle. There is a risk of corrosion inside the water jacket, and there is a hidden danger of contaminating the water coolant after corrosion. In addition, the water jacket base manufacturing process is complex, the manufacturing efficiency is low, and the manufacturing cost is high.

[0003] CN202020994956 discloses a permanent magnet wind turbine rotor structure. The rotor bracket structure is a commonly used cylindrical structure, but radial ventilation holes are opened on the bracket. There is no full circle of ventilation ducts, which can only provide surface heat dissipation but cannot form a passage, resulting in low heat dissipation efficiency.

[0004] CN202020285284 discloses a permanent magnet synchronous generator rotor magnetic steel heat dissipation structure, but it does not redesign the cooling structure of the generator and has limited heat dissipation capacity.

[0005] CN201910300163 discloses a cooling air duct structure for the permanent magnet poles of a generator rotor, in which an external cooling air duct cools the permanent magnets, an air guide tube is provided between the stator core and the machine base, a diversion duct is fixed to the inner wall of the driving end of the machine base, the air inlet of the cooler is sealed and docked with the air outlet on the driving end end cover, and the air outlet of the cooler is sealed and docked with the air inlet of the cooling fan, but the patent does not make any improvements to the stator core. Summary of the invention

[0006] The purpose of the present invention is to provide a permanent magnet generator to overcome at least one of the defects of the prior art. The permanent magnet generator adopts air-water cooling to solve the heat dissipation problem of the permanent magnet generator, greatly improves the heat dissipation efficiency, and avoids the hidden danger of corrosion inside the water jacket.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A permanent magnet generator, comprising:

[0009] Machine base;

[0010] The stator with ventilation duct inside has the outer circle of the stator pressing ring and the machine base with interference fit, so that a circumferential air duct is formed between the machine base and the outer circle of the stator core; the stator core structure with ventilation duct, combined with the modular truss-type fixed rotor with fin ventilation duct or the drum slotted magnetic pole structure, provides an effective internal heat dissipation air path for the motor;

[0011] The rotor located inside the stator is provided with rotor poles with finned ventilation ducts;

[0012] A cooler is installed on top of the base.

[0013] Furthermore, the rotor also includes a rotor support; the rotor poles are evenly arranged on the outer surface of the rotor support along the circumferential direction.

[0014] Furthermore, the rotor pole includes a rotor pole box, a ventilation slot plate with fins, and an axial locking rod; the rotor pole box and the ventilation slot plate are alternately stacked, and the rotor pole box and the ventilation slot plate with fins stacked in sequence are fixed by the axial locking rod. The fins can provide an internal circulation cooling air path pressure head when the rotor rotates, thereby helping to dissipate the overall heat of the generator.

[0015] Furthermore, there are multiple rotor pole boxes, preferably 15.

[0016] Furthermore, the rotor bracket is a truss-type rotor bracket, including an intermediate flange, cross bars evenly arranged along the periphery of the intermediate flange, and reinforcing ribs arranged between the intermediate flange and the cross bars. The reinforcing ribs can provide an unobstructed air flow path for the rotor to rotate while meeting the installation strength of the pole box. At the same time, the reinforcing ribs can act as a centrifugal fan to provide additional pressure head for the rotor. Among them, the rotor bracket adopts a truss-type structure with reinforcing ribs, which ensures the rigidity and strength of the rotor bracket on the basis of ensuring the ventilation of the rotor; the reinforcing ribs can also act as a centrifugal fan to provide a large amount of heat dissipation air for the rotor.

[0017] Furthermore, the rotor support is a drum slotted rotor support, including a middle flange, a drum sleeved on the outside of the middle flange, and reinforcing ribs arranged between the middle flange and the drum; the drum is provided with openings matching the number of ventilation slots. The reinforcing ribs can provide an unobstructed air flow path for the rotor to rotate while meeting the installation strength of the pole box, and the reinforcing ribs can act as a centrifugal fan to provide additional pressure head for the rotor.

[0018] Furthermore, the ventilation duct on the rotor pole is composed of ventilation slot plates, which can effectively provide an air duct pressure head; meanwhile, the ventilation slot plates are preferably made of stainless steel to avoid magnetic leakage.

[0019] Furthermore, the permanent magnet generator is also provided with a rear end cover; the rear end cover and the base form a closed cavity, and the cooling gas circulates inside the permanent magnet generator. More specifically, in one embodiment of the present invention, the permanent magnet generator adopts a double-circulation symmetrical air-water cooling design, and cooperates with a modular rotor pole structure with finned ventilation ducts and a stator core ventilation duct structure to provide a large-flow internal circulation air path. Compared with the traditional water-jacket-cooled motor, the upgraded heat exchange efficiency is high, which can effectively solve the motor heat dissipation problem.

[0020] Furthermore, there are at least two coolers; the coolers are symmetrically arranged on the surface of the base, and the hot air inside the permanent magnet generator enters the cooler evenly and is fully cooled. More specifically, the internal hot air passes through the ventilation duct of the rotor yoke, which cools the magnetic steel and the stator core and windings. Since the coolers are dispersed and symmetrically arranged, the ends of the stator windings with large diameters can be effectively cooled.

[0021] Furthermore, the cooler is an air-water cooler with a top drive fan disposed on the top.

[0022] Furthermore, the ventilation duct is made of magnetic-isolating material, preferably magnetic-isolating stainless steel.

[0023] Furthermore, the machine base is also provided with a circular ring-shaped supporting vertical plate for supporting the stator.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) The permanent magnet generator designed in the present invention adopts a new air-water cooling method, in which cooling water circulates outside the generator and air circulates inside the generator. The circulation inside the motor provides pressure head through the rotation of the rotor with finned ventilation ducts, and the cooler on the top of the cooler further provides kinetic energy for the internal circulation air path.

[0026] (2) The top cooler of the permanent magnet generator designed by the present invention is at least two coolers evenly arranged, so that the internal inlet and outlet air paths are more uniform, local hot spots can be eliminated, and heat dissipation efficiency is improved.

[0027] (3) The permanent magnet generator designed in the present invention adopts a double-circulation symmetrical air-water cooling design, which, combined with a modular rotor pole structure with finned ventilation ducts and a stator core ventilation duct structure, can provide a large-flow internal circulation air path. Compared with traditional water-jacket-cooled motors, the upgraded heat exchange efficiency is high and the motor heat dissipation problem can be effectively solved.

[0028] (4) The rotor bracket of the permanent magnet generator designed by the present invention is a rotor bracket with a truss structure and reinforcement ribs, or a rotor bracket with a reel slotted, and the reel is provided with openings matching the number of ventilation slots. Compared with the outer circle of the traditional cylindrical bracket, while meeting the requirements of the split modular rotor bracket fixation, the overall material and weight of the rotor bracket are reduced, the cost of raw materials is effectively saved, and the requirements of rotor ventilation and heat dissipation are also met. At the same time, the split pole box is adopted, and the blocks are magnetized before assembly, which is conducive to the assembly of the rotor pole box. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a front view of the permanent magnet generator in the embodiment;

[0030] Figure 2is a side view of the permanent magnet generator in the embodiment;

[0031] Figure 3 Schematic diagram of the internal wind path structure of the permanent magnet generator in the embodiment;

[0032] Figure 4 A schematic diagram of a rotor in an embodiment;

[0033] Figure 5 is a schematic diagram of a rotor pole in an embodiment;

[0034] Figure 6 is a schematic diagram of a rotor ventilation slot plate in an embodiment;

[0035] Figure 7 A front view of a truss-type rotor support in an embodiment;

[0036] Figure 8 is a side view of a truss-type rotor support in an embodiment;

[0037] Fig. 9 It is a front view of the drum slotted rotor support in the embodiment;

[0038] Fig.10 A side view of a drum slotted rotor support in an embodiment;

[0039] Fig.11 for Figure 1 Middle partial view;

[0040] Numbers in the figure are as follows: 1-machine base; 2-stator; 3-rotor bracket; 4-rotor pole; 5-top drive fan; 6-cooler; 7-rear end cover; 8-middle flange; 9-cross bar; 10-reinforcement rib; 11-rotor pole box; 12-ventilation slot plate; 13-axial locking rod; 14-ventilation slot bottom plate; 15-ventilation slot fin; 16-reel; 17-opening; 18-support vertical plate; a-circumferential air duct between machine base and stator core; b-stator ventilation duct; c-rotor pole ventilation duct; I-permanent magnet generator. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] Example

[0043] A permanent magnet generator, see Figure 1-11 ,include:

[0044] Base 1;

[0045] The stator 2 is provided with a ventilation duct, and the outer circle of the stator 2 pressing ring is shrunk and fitted with the base 1, so that a circumferential air duct is formed between the base 1 and the outer circle of the stator 2 core;

[0046] The rotor located in the stator 2 is provided with a rotor pole 4 with a finned ventilation duct, and a modular rotor pole structure with a finned ventilation duct. Since the rotor has a large diameter, the fins can provide a very large air volume to the inner air duct after rotation;

[0047] The cooler 6 is arranged on the top of the base 1. The stator core structure with ventilation ducts, combined with the modular truss-type fixed rotor poles 4 with fin ventilation ducts, provides an effective internal heat dissipation air path for the motor, namely, the circumferential air duct a between the base and the stator core.

[0048] See Figure 4 The rotor also includes a rotor support 3; the rotor poles 4 are evenly arranged on the outer surface of the rotor support 3 along the circumferential direction.

[0049] See Figure 5 The rotor pole 4 includes a plurality of rotor pole boxes 11, ventilation slot plates 12 with fins, and an axial locking rod 13; the rotor pole boxes 11 and ventilation slot plates 12 are alternately stacked, and the rotor pole boxes 11 and ventilation slot plates 12 with fins that are stacked in sequence are fixed by the axial locking rod 13. The fins can provide an internal circulation cooling air path pressure head when the rotor rotates, thereby helping to dissipate the overall heat of the generator.

[0050] See Figure 6 The ventilation slot plate 12 includes a ventilation slot bottom plate 14 and ventilation slot fins 15 arranged on the surface of the ventilation slot bottom plate 14 .

[0051] In this embodiment, the rotor support is a truss-type rotor support or a drum slotted rotor support.

[0052] If the rotor support 3 is a truss type rotor support, see Figure 7 , 8 , including the middle flange 8, the cross bars 9 evenly arranged along the periphery of the middle flange 8, and the reinforcing ribs 10 arranged between the middle flange 8 and the cross bars 9. The reinforcing ribs 10 can provide an unobstructed wind path for the rotor to rotate while meeting the installation strength of the pole box. At the same time, the reinforcing ribs 10 can act as a centrifugal fan to provide additional pressure head for the rotor. In addition, the rotor bracket 3 adopts a truss structure with reinforcing ribs, which ensures the rigidity and strength of the rotor bracket 3 on the basis of ensuring the ventilation of the rotor; the reinforcing ribs 10 can also act as a centrifugal fan to provide a large amount of heat dissipation air for the rotor.

[0053] If the rotor support 3 is a drum slotted rotor support, see Fig. 9 , 10, including a middle flange 8, a drum 16 sleeved on the outside of the middle flange 8, and a reinforcing rib 10 arranged between the middle flange 8 and the drum 16; the drum 16 is provided with openings 17 matching the number of ventilation slots 12. The reinforcing rib 10 can provide an unobstructed air flow path for the rotor when it rotates while meeting the installation strength of the pole box, and at the same time, the reinforcing rib 10 can act as a centrifugal fan to provide additional pressure head for the rotor.

[0054] See Figure 5 , 6 The ventilation duct on the rotor pole 4 is composed of a ventilation slot plate 12, which can effectively provide an air path pressure head; at the same time, the ventilation slot plate 12 is preferably made of stainless steel to avoid magnetic leakage.

[0055] See Figure 1 , Figure 2 The permanent magnet generator is also provided with a rear end cover 7; the rear end cover 7 and the base 1 form a closed cavity, and the cooling gas circulates inside the permanent magnet generator. In this embodiment, the permanent magnet generator adopts a double-circulation symmetrical air-water cooling design, and cooperates with a modular rotor pole structure with finned ventilation ducts and a stator core ventilation duct structure to provide a large-flow internal circulation air path. Compared with the traditional water-jacket-cooled motor, the upgraded heat exchange efficiency is high, which can effectively solve the motor heat dissipation problem.

[0056] See Figure 1 , 2 There are at least two coolers 6; the coolers 6 are evenly arranged on the surface of the base 1, and the hot air inside the permanent magnet generator evenly enters the cooler 6 to be fully cooled. In addition, the hot air inside the permanent magnet generator passes through the ventilation duct of the rotor yoke, which cools the magnetic steel and the stator core and winding. Since the coolers are dispersed and symmetrically arranged, the large-diameter stator winding end can be effectively cooled.

[0057] See Figure 2 The base is also provided with a circular ring-shaped supporting vertical plate 18 for supporting the stator 2.

[0058] In this embodiment, the cooler 6 is an air-water cooler with a top drive fan 5 disposed on the top. Specific implementation method:

[0060] In this embodiment, the generator has cooling water circulation outside and air circulation inside. The wind path structure diagram is as follows: Figure 2 shown.

[0061] When in use, the base 1 of the permanent magnet generator designed in this embodiment is heat-shrink-fitted with the outer circle of the pressure ring of the stator 2 with the ventilation duct, so that there is a circumferential air duct between the base 1 and the outer circle of the stator core. The air circulation inside the generator is provided by the rotation of the rotor pole 4 with the finned ventilation duct, and the top drive fan 5 on the top of the cooler 6 further provides kinetic energy for the internal circulation air path. The top cooler 5 is two symmetrically arranged coolers, which makes the internal inlet and outlet air paths more uniform, can eliminate local hot spots, and improve heat dissipation efficiency.

[0062] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A permanent magnet generator, characterized in that: include: Machine base (1); A stator (2) is provided with a ventilation duct, and the outer circle of the stator (2) pressing ring is shrunk and fitted with the machine base (1) so that a circumferential ventilation duct is formed between the machine base (1) and the outer circle of the stator (2) iron core; A rotor located inside the stator (2) is provided with a rotor pole (4) with a ventilation duct; A cooler (6) is arranged on the top of the machine base (1).

2. A permanent magnet generator according to claim 1, characterized in that: The rotor further comprises a rotor support (3); the rotor magnetic poles (4) are evenly arranged on the outer surface of the rotor support (3) along the circumferential direction.

3. A permanent magnet generator according to claim 2, characterized in that: The rotor magnetic pole (4) comprises a rotor magnetic pole box (11), a ventilation slot plate with fins (12), and an axial locking pull rod (13); The rotor pole boxes (11) and the ventilation slot plates (12) are alternately stacked, and the rotor pole boxes (11) and the ventilation slot plates (12) stacked in sequence are fixed by an axial locking pull rod (13).

4. A permanent magnet generator according to claim 3, characterized in that: The rotor support (3) is a truss-type rotor support, comprising an intermediate flange (8), cross bars (9) evenly arranged along the periphery of the intermediate flange (8), and reinforcing ribs (10) arranged between the intermediate flange (8) and the cross bars (9).

5. A permanent magnet generator according to claim 3, characterized in that: The rotor support (3) is a drum slotted rotor support, comprising an intermediate flange (8), a drum (16) sleeved on the outside of the intermediate flange (8), and reinforcing ribs (10) arranged between the intermediate flange (8) and the drum (16); the drum (16) is provided with openings (17) whose number matches the ventilation slot plate (12).

6. A permanent magnet generator according to claim 3, characterized in that: The ventilation passage on the rotor magnetic pole (4) is composed of a ventilation slot plate (12).

7. A permanent magnet generator according to claim 1, characterized in that: The permanent magnet generator is also provided with a rear end cover (7); the rear end cover (7) and the base (1) form a closed cavity, and cooling gas circulates inside the permanent magnet generator.

8. A permanent magnet generator according to claim 1, characterized in that: There are at least two coolers (6); the coolers (6) are symmetrically arranged on the surface of the base (1), and the hot air inside the permanent magnet generator evenly enters the coolers (6) to be fully cooled.

9. A permanent magnet generator according to claim 1, characterized in that: The cooler (6) is an air-water cooler with a top drive fan (5) disposed on the top.

10. A permanent magnet generator according to claim 1, characterized in that: The machine base (1) is also provided with a circular ring-shaped supporting vertical plate (18) for supporting the stator (2).

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