CN201280999Y - Speed changing frequency-constant permanent magnet speed governing wind power generator - Google Patents

Abstract

Variable-speed constant-frequency permanent-magnet speed-regulating wind generator, which includes a wind wheel, a drive shaft, a speed-up gearbox, a generator and a frequency converter; it also includes a permanent-magnet speed on the drive shaft between the generator and the generator. The utility model has the following advantages: 1) The air gap is adjusted by the permanent magnet governor so that the output of the wind wheel or the gear box to the generator speed can be adjusted steplessly, which can make the generator speed relatively constant; 2) Realize soft start, At any speed of the wind turbine, the generator can be cut in and out at any time, which can increase the power generation time of the wind turbine; 3) Eliminate system vibration, prolong the life of system equipment, and improve reliability; 4) Adapt to various harsh working environments; 5) Reduce the parts of the whole machine, reduce the cost and later use and maintenance costs; 6) not afraid of stalling, not afraid of pulse; 7) tolerate the centering error; 8) prolong the life of the equipment and increase the failure cycle; 9) no electromagnetic interference; cost.

Description

Variable speed constant frequency permanent magnet speed regulation wind turbine

technical field

The utility model relates to a wind power generator, in particular to a variable speed constant frequency permanent magnet speed regulating wind power generator.

Background technique

Now, there are mainly two types of large and medium-sized wind turbines in the world. One is the fixed-pitch stall-adjusting type, which belongs to the constant-speed model. Generally, a synchronous motor or a squirrel-cage asynchronous motor is used as a generator, and the speed of the generator is kept at a constant value through a wind turbine controlled by a fixed-pitch stall. Then, after the wind turbine is connected to the grid, the rotation frequency of the stator magnetic field is equal to the grid frequency, the range of change of the rotor and impeller is small, and the efficiency of capturing wind energy is low. The other type is the variable-speed variable-pitch type, which generally uses double-fed motors or permanent magnet synchronous motors. The speed of the impeller can be changed in a wide range following the change of wind speed through the combination of governor and variable pitch control. Optimum tip speed ratio operation, so that the wind energy utilization coefficient can maintain the maximum value in a large range of wind speed changes, and the energy capture efficiency is maximum. The electric energy generated by the generator is regulated by the converter, and it becomes electric energy with the same frequency, same phase and same amplitude as the grid and is sent to the grid. In contrast, variable speed wind turbines have incomparable advantages.

At present, there are mainly two schemes for the power drive system of variable speed variable pitch wind turbines: one is the speed-up gearbox + wound asynchronous motor + double-fed inverter; the other is direct drive low-speed permanent magnet without gearbox Generator + full power inverter. The two schemes have their own advantages and disadvantages: the former uses a high-speed motor, which is small in size and light in weight. The capacity of the double-fed inverter is only related to the slip capacity of the motor, which has high efficiency and low price. The disadvantage is that the speed-up gearbox is expensive and noisy. , Easy to be damaged by fatigue; the latter has no gearbox and has high reliability, but uses a low-speed permanent magnet motor, which is large in size and high in cost, and the frequency converter needs full power, which increases the cost.

To sum up, the comprehensive performance of the current variable-speed and variable-pitch wind turbines is not perfect yet.

Utility model content

The technical problem to be solved by the utility model is to provide a variable-speed constant-frequency permanent magnet speed-regulating wind power generator. The wind power generator can greatly reduce the cost of the whole machine, can reduce the parts used by the wind turbine, has small volume, light weight, high efficiency, high reliability and good maintainability.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical scheme: it includes a wind wheel, a transmission shaft, a generator and a frequency converter; on the transmission shaft between the machines.

In a further improved technical solution, a speed-up gearbox is arranged between the permanent magnet governor and the wind wheel.

As a further improved technical solution, the permanent magnet governor includes a copper disc rotor and a disc rotor matching the size of the copper disc rotor; the copper disc rotor and the disc rotor face each other on the concentric axis, and the air gap between them is The gap is adjustable.

The utility model has the following advantages:

1) The air gap is adjusted by the permanent magnet governor so that the output of the wind wheel (gearbox) to the generator speed can be adjusted steplessly, which can make the generator speed relatively constant and realize the high-efficiency and high-quality power generation of the wind turbine.

2) Soft start is realized, and the generator can be switched in and out at any time at any speed of the fan, which can increase the power generation time of the wind generator.

3) Eliminate system vibration, prolong the life of system equipment and improve reliability.

4) Adapt to various harsh working environments.

5) Reduce the parts of the whole machine, reduce the cost and the cost of later use and maintenance.

6) Not afraid of stalling, not afraid of pulse. (Protect the motor, the mechanical seal is good.)

7) Tolerate alignment errors.

8) Extend the life of the equipment and increase the failure cycle.

9) No electromagnetic interference.

10) Reduce total cost.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail

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

Fig. 2 is the structural representation of the permanent magnet governor of the present utility model;

Fig. 3 is a working principle diagram of the permanent magnet governor of the present invention.

Detailed ways

Referring to Fig. 1, shown in Fig. 2, the utility model it comprises wind wheel 1, transmission shaft 2, speed-up gear box 3, permanent magnet governor 4, generator 5 and frequency converter 6; Described permanent magnet governor 4 is arranged on the transmission shaft 2 between the transmission gearbox 3 and the generator 5; the permanent magnet governor 4 includes a copper disk rotor 41 and a disk rotor 42 matching the size of the copper disk rotor 41, and the copper disk rotor 41 and the disk rotor 42 face each other on the concentric shaft, and the air gap between the copper disk rotor 41 and the disk rotor 42 is adjustable, and the prior art uses an electric actuator (not shown in the figure) to perform Adjustment work. The wind power generator of the present utility model is arranged on the tower frame 7 .

The working principle of the utility model is as follows:

Referring to the accompanying drawing 3, when the wind wheel 1 rotates, the magnetic force line NS copper conductor drives the copper disk rotor 41 to cut the magnetic force line in the strong magnetic field generated by the disk rotor 42, thus generating an eddy current in the copper disk rotor 41, the eddy current Conversely, an anti-magnetic field is generated around the copper disk rotor 41 to prevent the relative movement between the copper disk rotor 41 and the disk rotor 42 , thereby realizing the torque transmission between the wind wheel 1 and the generator 5 . The torque transmission between the wind wheel 1 and the generator 5 is different from the conventional mechanical connection method, which is connected through an air gap, that is, the speed adjustment is realized by adjusting the air gap distance between the copper disk rotor 41 and the disk rotor 42, Other speed regulation methods do not have this feature.

When the magnetic force line passes through the copper conductor, it will not work when it is stationary; when the two have relative motion, the magnetic force line moves in the conductor to generate an induced eddy current, and then an induced magnetic field is generated on the copper conductor, thereby generating a torque; the closer the magnetic force line density is, the denser it is , the stronger the effect, the greater the torque; the faster the relative movement, the stronger the effect, the greater the torque (the greater the slip, the greater the torque); the greater the relative movement, the stronger the magnetic field induced by the two , to generate mutually repelling forces to achieve the purpose of speed regulation.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. All the implementation manners cannot be exhaustively listed here. All obvious changes or variations derived from the technical solutions of the utility model are still within the scope of protection of the utility model.

Claims (3)

1. A variable-speed constant-frequency permanent-magnet speed-regulating wind generator, which includes a wind wheel, a transmission shaft, a generator and a frequency converter; it is characterized in that it also includes a permanent-magnet speed governor, which is set on the wind wheel on the drive shaft between the generator and the generator. 2. The variable-speed constant-frequency permanent magnet speed-regulating wind power generator according to claim 1, characterized in that: a speed-up gear box is arranged between the permanent magnet speed governor and the wind wheel. 3. The variable-speed constant-frequency permanent-magnet speed-regulating wind power generator according to claim 1 or 2, characterized in that: the permanent-magnet speed governor includes a copper disk rotor and a disk rotor matching the size of the copper disk rotor, and the The copper disk rotor and the disk rotor face each other on the concentric axis, and the air gap between the copper disk rotor and the disk rotor is adjustable.

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