CN201486773U - A megawatt-level direct drive inner rotor permanent magnet wind turbine - Google Patents

Abstract

The utility model discloses a megawatt-level direct-drive inner rotor permanent magnet wind power generator set. The utility model includes a wind wheel, a variable pitch system, a permanent magnet generator, a machine seat and a yaw system. The permanent magnet generator includes casing, stator, front end cover, rotor, rear end cover and rotor rotation support mechanism, the rotor rotation support mechanism includes a moving shaft, a bearing I, a fixed shaft and a bearing II, both the moving shaft and the fixed shaft are hollow shafts, and the moving shaft Outside the fixed shaft of the shaft sleeve, one end between the moving shaft and the fixed shaft is provided with a bearing I, and the other end is provided with a bearing II. The hollow fixed shaft of the utility model can provide equipment maintenance personnel with a passage from the machine seat to the wheel hub to ensure personal safety. Bearing capacity requirements are low, and the end cover and fixed shaft on the bearing side of the generator are connected to the frame of the nacelle at the same time, so that the end cover bears the load of the generator stator, and the fixed shaft bears the load of the rotor and wind wheel.

Description

A megawatt-level direct drive inner rotor permanent magnet wind turbine

technical field

The utility model relates to a wind power generating set, in particular to a megawatt level direct drive inner rotor permanent magnet wind generating set.

Background technique

In wind turbines, the direct-drive generator structure is called direct-drive wind turbine, but the direct-drive wind turbine is a new technology product developed in recent years. System components, improve the reliability and power generation efficiency of wind turbines, and reduce the noise of wind turbines. A full power converter is used between the generator and the grid. Suitable for power grid fault operation capability.

At present, there are direct-drive outer rotor wind turbines in the domestic and foreign markets, direct-drive inner rotors with single-bearing wind turbines, and direct-drive double-bearing solid-shaft wind turbines.

There are different levels of deficiencies in the above-mentioned direct-drive wind turbines. For example, direct-drive external rotor wind turbines are not well sealed, and wind, sand, mosquitoes, etc. can easily enter the interior of the generator, causing damage to the power generation. It is very unsafe to pass from the engine room to the hub through the outside of the generator. Another example is a generator set with a single-bearing support structure, which requires a bearing to carry both axial force and radial force at the same time. The bearing requirements are extremely high, and the bearing manufacturing process is difficult and the cost is high. The support shaft of the double-bearing solid shaft wind turbine is fixed on the front and rear end covers, and the rear end cover is fixed on the frame, so that the rear end cover bears the casing, stator, rotor, front end cover, rotor support shaft and is fixed on the rotor. impeller and its own weight. The load on the rear end cap is too high. Another example is that the double-bearing supported solid-core shaft direct-drive generator has poor ventilation and heat dissipation, and it needs to pass outside the generator from the engine room to the hub, which poses a safety hazard.

Contents of the invention

The technical problem to be solved by the utility model is to provide a megawatt-level direct drive inner rotor permanent magnet wind power generation unit with uniform load distribution, low requirements on the bearing capacity of the rear end cover and supporting rotor, and high safety performance.

In order to solve the above technical problems, the utility model includes a wind wheel, a variable pitch system, a permanent magnet generator, a nacelle base and a yaw system, and the permanent magnet generator includes a casing, a stator, a front end cover, a rotor, a rear end cover and The rotor rotation support mechanism, the rotor rotation support mechanism includes a moving shaft, a bearing I, a fixed shaft and a bearing II, the moving shaft and the fixed shaft are both hollow shafts, the moving sleeve is outside the fixed shaft, and the space between the moving shaft and the fixed shaft is One end is provided with a bearing I, and the other end is provided with a bearing II, the rotor is fixed on the moving shaft, the moving shaft is connected with the wind wheel, and the fixed shaft is connected with the frame of the nacelle.

In order to make the center of gravity shift towards the frame of the nacelle on the premise of facilitating the passage of maintenance personnel, the moving shaft and the fixed shaft are conical hollow shafts, and the large end of the fixed shaft is fixed to the frame of the nacelle.

In order to facilitate the fixing of the rear end cover, the fixed shaft and the engine room frame, and to make the load distribution more uniform, the fixed axis is provided with a block outside the rear end cover, and the rear end cover, the block block and the engine room frame The connectors are sequentially connected in series and fixed.

In order to facilitate the internal heat dissipation of the permanent magnet generator, the casing is provided with cooling ribs, and the rear end cover is provided with a cooling fan.

The beneficial effects of the utility model are: the wind wheel of the utility model is directly connected with the moving shaft, so that the wind wheel captures the kinetic energy of the wind to directly drive the rotor, and the rotor rotates so that the generator converts the kinetic energy into electric energy. The hollow fixed shaft can provide equipment maintenance personnel with a passage from the engine room base to the hub, ensuring personal safety. The moving shaft is supported by two bearings, and the bearing capacity requirements are low. The end cover and the fixed shaft on the generator side are connected to the frame of the nacelle at the same time, so that the end cover bears the load of the generator stator, and the fixed shaft bears the load of the rotor and wind wheel. The utility model has the advantages of simple structure, good utilization rate of wind energy, high power generation efficiency, stable and reliable operation, and simple and scientific combination of the whole machine.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is the structural representation of part 4 and part 7 in Fig. 1;

In the figure: 1. Wind wheel, 2. Pitch pitch system, 3. Moving shaft, 4. Permanent magnet generator, 5. Cooling ribs, 6. Cooling fan, 7. Engine seat, 8. Yaw system, 9 , bolt I, 10, bolt II, 11, casing, 12, bolt III, 13, stator, 14, front cover, 15, rotor, 16, sealing ring, 17, bearing I, 18, fixed shaft, 19, bearing II, 20, rear end cover.

Detailed ways

As a specific embodiment shown in FIG. 1 , it includes a wind rotor 1 , a pitch control system 2 , a permanent magnet generator 4 , a nacelle base 7 and a yaw system 8 .

As shown in Figure 2, permanent magnet generator 4 comprises casing 11, stator 13, front end cover 14, rotor 15, rear end cover 20 and rotor rotation support mechanism, and front end cover 14 is fixed on the front end of casing 11 by bolt III 12 , rear end cover 20 is fixed on the rear end of casing 11 by bolt III 12. The casing 11 is provided with cooling ribs 5 , and the rear end cover 20 is provided with a cooling fan 6 . The stator 13 and the rotor 15 are disposed inside the casing 11 . The rotor rotation support mechanism includes a moving shaft 3, a bearing I17, a fixed shaft 18 and a bearing II 19, the moving shaft 3 and the fixed shaft 18 are conical hollow shafts, the moving shaft 3 and the fixed shaft 18 are inserted in the casing 11, and the moving shaft 3 sets outside the fixed shaft 18, one end between the moving shaft 3 and the fixed shaft 18 is provided with a bearing I 17, and the other end is provided with a bearing II 19, the rotor 15 is fixed on the moving shaft 3, and the moving shaft 3 is connected to the wind wheel through the bolt II 10 1 connection, a sealing ring 16 is provided between the moving shaft 3 and the front end cover 14. Fixed shaft 18 is in one end outside rear end cover 20 and there is block platform, and rear end cover 20, block platform and cabin frame 7 are fixed in series by bolt 19 successively.

Claims (4)

1. megawatt-stage direct-drive internal rotor permanent-magnetic wind power generating set, comprise wind wheel (1), become slurry apart from system (2), permanent magnet generator (4), cabin support (7) and yaw system (8), permanent magnet generator (4) comprises casing (11), stator (13), front cover (14), rotor (15), rear end cover (20) and rotor rotary support mechanism, it is characterized in that: described rotor rotary support mechanism comprises moving axis (3), bearing I (17), dead axle (18) and bearing I I (19), moving axis (3) and dead axle (18) are hollow shaft, outside moving axis (3) the cover dead axle (18), end between moving axis (3) and the dead axle (18) is established bearing I (17), the other end is established bearing I I (19), rotor (15) is fixed on the moving axis (3), moving axis (3) is connected with wind wheel (1), and dead axle (18) is connected with cabin support (7).

2. megawatt-stage direct-drive internal rotor permanent-magnetic wind power generating set according to claim 1 is characterized in that: described moving axis (3) and dead axle (18) are the taper hollow shaft, and the big end of dead axle (18) and cabin support (7) fix.

3. megawatt-stage direct-drive internal rotor permanent-magnetic wind power generating set according to claim 1 and 2, it is characterized in that: described dead axle (18) is provided with and is in the outer retaining platform of rear end cover (20), and rear end cover (20), retaining platform and cabin support (7) are connected in series fixing by link successively.

4. megawatt-stage direct-drive internal rotor permanent-magnetic wind power generating set according to claim 3 is characterized in that: described casing (11) is provided with radiating fin (5), and rear end cover (20) is provided with radiation fan (6).

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