CN201757034U - Megawatt-class low-speed permanent magnet direct-drive wind generating set - Google Patents

Abstract

The utility model relates to a megawatt-class low-speed permanent magnet direct-drive wind generating set, which comprises a pylon, an engine room assembly, a rotary support frame, an inner rotor permanent magnet low-speed electric generator, a hub, a variable pitch blades system and a low wing-speed blade, wherein the low wing-speed blade is mounted on the hub; the hub is connected with an inner rotor of the inner rotor permanent magnet low-speed electric generator; the other end of the inner rotor permanent magnet low-speed electric generator is fixed on the rotary support frame; and the rotary support frame is mounted on the pylon. The wind generating set provided by the utility model can improve utilization rate of domestic wind source, and increase annual energy output of the wind generating set, thereby having appreciable economic benefit.

Description

Megawatt low-speed permanent magnet direct drive wind turbine

technical field

The utility model relates to a wind power generating device, in particular to a megawatt level low-speed permanent magnet direct drive wind power generating set.

Background technique

Wind energy is clean and renewable energy. In recent years, the average annual growth rate of wind power installed capacity in the world has exceeded 30%, becoming the fastest growing energy equipment. At present, wind turbines installed in wind farms mainly include brushless doubly-fed wind turbines and direct-drive permanent magnet wind turbines. Due to the high rated speed of double-fed generators, special wind power gearboxes are required, and due to the operation of wind turbines Due to the harsh environment, the problem of gearbox damage is very prominent, so people use direct drive permanent magnet motors instead of double-fed generators, which saves the main shaft, bearing housing, gearbox and couplings, and reduces the mechanical connection equipment due to different The beating and vibration generated by the heart improves the conversion efficiency of the unit and the reliability of the wind turbine.

At present, all types of wind turbines can work stably only in areas with good wind resources, but in areas with average wind resources, the operating efficiency is not high, and the annual operation time is about 2000 hours. It is very necessary to design a safe, reliable, low failure rate low-speed permanent magnet direct drive wind turbine suitable for wind farms in my country.

Utility model content

The megawatt-level low-speed permanent magnet direct-drive wind power generator provided by the utility model includes a tower, a nacelle assembly, a slewing bracket, an inner rotor permanent magnet low-speed generator, a wheel hub, a pitch system, and a low-wind speed blade. The blades are installed on the hub, and the hub is connected with the inner rotor permanent magnet low-speed generator and drives its inner rotor to rotate. The other end of the inner rotor permanent magnet low-speed generator is fixed on the slewing bracket. The slewing bracket is installed on the tower.

Preferably, a yaw brake system and an electrical cabinet are installed on the slewing bracket.

Preferably, the inner-rotor permanent magnet low-speed generator and the hub as a whole are disposed horizontally upward by 2-7°.

Preferably, cooling fins are installed outside the stator of the inner rotor permanent magnet low-speed generator.

The beneficial effects of the utility model are as follows.

The wind power generation unit provided by the utility model can improve the utilization rate of wind resources in my country, increase the annual power generation of the wind power generation unit, and has considerable economic benefits. In addition, the inner rotor permanent magnet low-speed direct-drive generator is used, which eliminates the noise and failure caused by the gearbox, and the noise in the engine room is low, which is suitable for the staff to maintain the unit.

Description of drawings

Accompanying drawing 1 is the structure schematic diagram of megawatt level low-speed permanent magnet direct-drive wind power generating set of the present utility model.

Detailed ways

An embodiment of the megawatt-level low-speed permanent magnet direct-drive wind power generating set of the present invention will be described below in conjunction with accompanying drawing 1 .

The megawatt-level low-speed permanent magnet direct-drive wind power generating set of the utility model includes a tower frame 1, a nacelle assembly 4, a slewing bracket 5, an inner rotor permanent magnet low-speed generator 6, a wheel hub 7, a pitch control system 8, and low wind speed blades 9 , the low wind speed blade 9 is installed on the hub 7, the hub 7 is connected with the inner rotor permanent magnet low speed generator 6 and drives its inner rotor to rotate, the other part of the inner rotor permanent magnet low speed generator 6 One end is fixed on the slewing bracket 5, and the slewing bracket 5 is installed on the tower 1; a yaw braking system 2 and an electrical cabinet 3 are installed on the slewing bracket.

Among them, the wind wheel adopts low-wind-speed blades 9 with good aerodynamic performance, low start-up wind speed, and high utilization rate of wind energy.

The inner-rotor permanent magnet low-speed generator 6 and the hub 7 are set horizontally upward by 2-7° as a whole, which reduces the bearing load of the overall hub assembly.

The stator of the inner rotor permanent magnet low-speed generator 6 is equipped with heat sinks outside, which is more conducive to the heat dissipation of the coils, so that the internal temperature of the motor will not be very high, and the effect of protecting the motor is achieved.

Cooperate with the unique control strategy to monitor the operation of the unit, so that the unit can run safely and stably, the converter is connected to the grid at full power, the power quality is high, the impact on the grid is small, and the power generation of the unit is increased.

In addition, the nacelle cover and the hub cover are sealed and connected, which improves the protection performance and safety performance, and facilitates the maintenance and maintenance of the hub equipment.

The whole structure is supported by the tower, which transmits the load of the unit to the slewing bracket 5. The slewing bracket 5 is cast and has good strength and rigidity, which is enough to bear the load of the whole unit, so that the unit can operate safely and stably.

Claims (4)

1. A megawatt-level low-speed permanent-magnet direct-drive wind turbine, comprising a tower (1), a nacelle assembly (4), a slewing bracket (5), an inner rotor permanent-magnet low-speed generator (6), and a hub (7 ), a pitch system (8), a low wind speed blade (9), the low wind speed blade (9) is installed on the hub (7), it is characterized in that the hub (7) is permanently connected to the inner rotor The inner rotor of the magnetic low-speed generator (6) is connected, and the other end of the inner rotor permanent magnet low-speed generator (6) is fixed on the slewing support (5), and the slewing support (5) is installed on the tower on the rack (1). 2. The megawatt-level low-speed permanent magnet direct-drive wind power generator set according to claim 1, characterized in that a yaw braking system (2) and an electrical cabinet (3) are installed on the slewing support. 3. The megawatt-level low-speed permanent magnet direct-drive wind power generator set according to claim 2, characterized in that, the inner rotor permanent magnet low-speed generator (6) and the hub (7) as a whole deviate horizontally by 2 -7° setting. 4. The megawatt-level low-speed permanent magnet direct-drive wind power generator set according to claim 1, characterized in that, a heat sink is installed outside the stator of the inner rotor permanent magnet low-speed generator (6).

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