CN201786562U - Dual-stator direct drive permanent magnet wind-driven generator - Google Patents

Abstract

The utility model relates to a double-stator direct-drive permanent magnet wind power generator, which includes an inner stator, an outer stator, a cup-shaped rotor, a front flange, a rear flange, a shell, a main shaft, a front bearing, a front bushing, and a front bearing Outer cover, front bearing inner cover, rear bearing, rear shaft sleeve, rear bearing inner cover, rear bearing outer cover, lock sleeve and lock nut; both inner and outer stators include stator cores, and are installed in stator cores The outer stator is fixed on the shell, and the inner stator is fixed on the flange facing the opening of the cup-shaped rotor; the cup-shaped rotor includes the rotor core, the support frame supporting the rotor core, and the rotor iron core. Permanent magnets with different polarities and staggered arrangement on the core; the main shaft passes through the front bearing, the front shaft sleeve, the front bearing outer cover, the front bearing inner cover, the rear bearing, the rear shaft sleeve, the rear bearing inner cover and the rear bearing outer cover through the front method flange, rear flange and cup-shaped rotor, and protrude from the front flange, and the front flange and rear flange are fixed on the shell. The utility model can effectively improve the efficiency of the motor and reduce the cost of the motor. The utility model can be widely used in various sea and land wind farms.

Description

Double stator direct drive permanent magnet wind turbine

technical field

The utility model relates to a wind power generator equipment, in particular to a double-stator direct-drive permanent magnet wind power generator. the

Background technique

At present, wind power generators are developing in the direction of high reliability, low maintenance, reduced components, lower costs, high efficiency, and high integration. The general trend is that the capacity of a single machine continues to increase. In variable-speed constant-frequency wind power generation systems, double-fed asynchronous generators and permanent magnet synchronous generators are mostly used. Among them, the doubly-fed asynchronous generator, due to the presence of a gearbox, carbon brushes and slip rings on the rotor, leads to high system cost, poor reliability, large maintenance, and serious noise pollution. And when its low-load operation, the efficiency is low, especially with the increase of stand-alone capacity, the problem is more prominent. Therefore, direct drive and brushless are getting more and more attention. Direct-drive permanent magnet wind turbines based on variable speed operation, variable pitch adjustment, low speed, high efficiency, and high power factor have become the future development trend, which has the following advantages: 1. This type of generator uses permanent magnet excitation , Eliminate the excitation loss, improve the efficiency, and realize the brushless. 2. When this type of generator is running, it does not need to absorb reactive power from the grid to establish a magnetic field, which can improve the power factor of the grid. 3. The wind turbine is used to directly drive the generator, the gearbox is eliminated, the efficiency and reliability of the wind turbine are improved, the maintenance amount of the equipment is reduced, and the noise pollution is reduced. However, direct-drive permanent magnet wind turbines are directly connected to wind turbines, with low speed, large number of poles, large stators and rotors, and a flat structure, which brings a problem of transportation difficulties for large motors that cannot be ignored. On the other hand, many wind farms on land are designed in remote mountainous areas. From the factory of the motor to the installation site, it is likely to pass through some bridges and culverts. If the outer diameter of the motor is too large, it will not be able to pass through. the

There is another application situation: large-scale offshore wind farms use direct-drive permanent magnet wind turbines, and the wind turbines adopt decentralized wind turbine control and direct grid connection. The method of decentralized wind turbine control and direct grid connection is a flexible DC transmission method. Each wind turbine has its own converter. By connecting multiple wind turbines in parallel, the transmission capacity can be increased, and a single wind turbine can be controlled separately to work at its ideal level. state, all wind turbines will not be unable to deliver power to the grid due to a single converter failure. At present, the permanent magnet generator used in the offshore flexible direct current transmission mode of the low-speed permanent magnet direct drive wind turbine is generally a low-voltage alternator. , and connected to the DC bus to achieve grid connection. However, this type of generator has complex structure, high cost and low efficiency. the

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a high-efficiency, high-reliability, simple-structure dual-stator direct-drive permanent magnet wind generator. the

In order to achieve the above purpose, the utility model adopts the following technical solutions: a double-stator direct-drive permanent magnet wind generator, which is characterized in that it includes an inner stator, an outer stator, a cup-shaped rotor, a front flange, a rear flange, a shell Body, main shaft, front bearing, front bushing, front bearing cover, front bearing inner cover, rear bearing, rear bushing, rear bearing inner cover, rear bearing cover, locking sleeve for torque transmission and cup A lock nut for axial positioning of the cup-shaped rotor; the inner and outer stators both include a stator core, and multi-phase windings installed in the stator core; the cup-shaped rotor includes a rotor core, supporting the rotor The support frame of the iron core, and the permanent magnets with different N and S polarities arranged in a staggered arrangement on the rotor iron core; the outer stator is fixed on the housing, and the inner stator and the cup-shaped One of the front flange and the rear flange facing the opening of the rotor is fixed; the main shaft passes through the front bearing, the front bushing, the front bearing outer cover, the front bearing inner cover, the rear bearing, the rear bushing, and the rear bearing The inner cover and the rear bearing outer cover run through the front flange, the rear flange and the cup-shaped rotor, and protrude from the front flange, and the front flange and the rear flange are fixed on the housing superior. the

The outer stator forms a first working air gap with the cup-shaped rotor, and the cup-shaped rotor forms a second working air gap with the inner stator. the

The double-stator direct-drive permanent magnet wind power generator adopts a series magnetic circuit structure, through which the permanent magnets are composed of the inner and outer stators, the cup-shaped rotor, the first working air gap and the second working air gap series magnetic circuit. the

The permanent magnets with different and staggered N and S polarities are installed on the inner and outer surfaces of the rotor iron core. the

The permanent magnets arranged in a staggered arrangement with different N and S polarities are installed in inner and outer forming grooves of the rotor iron core. the

The inner and outer stators have the same number of slots and the same number of pole pairs, and the multi-phase windings of the inner and outer stators are all in the form of single-pitch windings with fractional slots, corresponding to the anti-phase series connection of two non-phase windings. the

Due to the adoption of the above technical scheme, the utility model has the following advantages: 1. The dual-stator direct-drive permanent magnet wind-driven generator of the utility model has low rotating speed and large number of poles, and the dual-stator structure adopted can make full use of the In the internal space, under the same volume condition, compared with the ordinary single stator mechanism, the output voltage and output power of the motor can be increased by 40% to 100%, therefore, the performance volume ratio of the motor is effectively improved. 2. Since the multi-phase windings of the two inner stators and the two outer stators of the utility model adopt the single-pitch winding form of fractional slots, this kind of winding structure is easy to realize automatic machine off-line and reduce the complexity of winding off-line; more importantly It is this kind of fractional slot single-pitch winding that can reduce the length of the winding end, so that the length of the entire motor is reduced, the volume is reduced, and the weight is reduced; the reduction of the length of the winding end reduces the amount of copper used, and also reduces The copper loss of the winding is reduced, the cost of the motor is reduced, and the efficiency is improved. 3. Since the utility model adopts the permanent magnet direct drive wind power generator with fractional slot single-pitch winding structure, the least common multiple of the number of poles and the number of slots of the motor is relatively large, which can weaken the magnetic field induced potential distributed by non-sinusoidal waves. Harmonic components and tooth harmonic components, and can greatly reduce the cogging torque caused by the cogging effect, which is an important indicator in the operation of low-speed direct-drive permanent magnet generators. 4. The dual-stator direct-drive permanent magnet wind power generator adopted by the utility model can effectively improve the output voltage and the performance-to-volume ratio of the motor in a wind power generation system with a low speed, and can effectively solve the problem of large-scale direct-drive permanent magnet wind power generators on land. The transportation problem of the magnetic wind turbine and the high voltage output problem required by the flexible DC transmission method for large direct-drive permanent magnet wind turbines at sea. The utility model can be widely used in various sea and land wind farms. the

Description of drawings

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

Fig. 2 is a structural schematic diagram of the utility model applied to a direct-drive wind power generating set. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail. the

As shown in Figure 1, the dual-stator direct-drive permanent magnet wind power generator provided by the utility model includes an inner stator 1, an outer stator 2, a cup-shaped rotor 3, a front flange 4, a rear flange 5, a housing 6. Main shaft 7, front bearing 8, front shaft sleeve 9, front bearing outer cover 10, front bearing inner cover 11, rear bearing 12, rear axle sleeve 13, rear bearing inner cover 14, rear bearing outer cover 15, for transmission Torque lock sleeve 16 and lock nut 17 for axial positioning of cup rotor 3 . the

The inner and outer stators 1 and 2 both include stator cores and multi-phase windings installed in the stator cores. The cup-shaped rotor 3 includes a rotor core, a support frame supporting the rotor core, and permanent magnets with different N and S polarities arranged in a staggered arrangement installed on the inner and outer surfaces of the rotor core or in the inner and outer forming grooves of the rotor core. , and the opening of the cup rotor 3 may correspond to the front flange 4 or to the rear flange 5 . The outer stator 2 and the housing 6 are fixed together, and the inner stator 1 is fixed together with the front flange 4 or the rear flange 5 facing the opening of the cup-shaped rotor 3 . The outer stator 2 and the cup-shaped rotor 3 form a first working air gap, and the cup-shaped rotor 3 and the inner stator 1 form a second working air gap. The main shaft 7 passes through the front bearing 8, the front shaft sleeve 9, the front bearing outer cover 10, the front bearing inner cover 11, the rear bearing 12, the rear shaft sleeve 13, the rear bearing inner cover 14 and the rear bearing outer cover 15, and runs through the front flange 4 , the rear flange 5 and the cup rotor 3, and extend out of the front flange 4. The front flange 4, the rear flange 5 and the housing 6 are fixed together. the

In the above embodiment, the inner and outer stators 1 and 2 have the same number of slots and the same number of pole pairs, and the multi-phase windings of the inner and outer stators 1 and 2 are all in the form of single-pitch windings with fractional slots, corresponding to the opposite phase of the two same-phase windings in series. the

The dual-stator direct-drive permanent magnet wind power generator of the utility model adopts a series magnetic circuit structure, and the permanent magnets with different polarities and staggered arrangement are pasted on the inner and outer surfaces of the rotor iron core or in the inner and outer forming grooves to form a structure through the inner , the outer stators 1, 2, and the cup rotor 3, the series magnetic circuit of the first working air gap and the second working air gap. the

As shown in Figure 2, the main shaft 7 of the double-stator direct-drive permanent magnet generator of the present utility model is directly connected with the wheel hub 18 of the wind turbine, and the rear flange 5 of the double-stator direct-drive permanent magnet generator is connected with the frame 19 . When the wind power generator adopts the AC grid-connected mode, the stator output winding of the dual-stator direct-drive permanent magnet generator of the utility model is connected with the matching full-power converter to realize the variable speed and constant frequency of the wind power generator; the wind power generator adopts In the flexible direct current transmission mode, the stator output windings of the dual-stator direct-drive permanent magnet generator of the utility model are connected with a controllable rectifier to realize the variable-speed constant-voltage direct-current output of the wind power generator. the

In the above-mentioned embodiments, there may be other changes in the structure, connection, and structure of the inner and outer stator windings. The changes and improvements based on the technical solutions of the present invention should not be excluded from the scope of protection of the present invention. the

Claims (9)

1. A double-stator direct-drive permanent-magnet wind-driven generator, characterized in that: it comprises an inner stator, an outer stator, a cup-shaped rotor, a front flange, a rear flange, a housing, a main shaft, a front bearing, a front axle sleeve, Front bearing outer cover, front bearing inner cover, rear bearing, rear bushing, rear bearing inner cover, rear bearing outer cover, lock sleeve for torque transmission and lock nut for axial positioning of cup rotor; The inner and outer stators both include a stator core and a multi-phase winding installed in the stator core; the cup-shaped rotor includes a rotor core, a support frame supporting the rotor core, and a The N and S polarities on the rotor core are staggered permanent magnets; the outer stator is fixed on the housing, the inner stator is opposite to the front flange of the opening of the cup-shaped rotor and One of the rear flanges is fixed; the main shaft passes through the front bearing, the front axle sleeve, the front bearing outer cover, the front bearing inner cover, the rear bearing, the rear axle sleeve, the rear bearing inner cover and the rear bearing outer cover, and runs through the The front flange, the rear flange and the cup-shaped rotor extend out of the front flange, and the front flange and the rear flange are fixed on the housing. 2. The double-stator direct-drive permanent magnet wind power generator according to claim 1, characterized in that: the outer stator and the cup-shaped rotor form a first working air gap, and the cup-shaped rotor and the inner stator A second working air gap is formed. 3. The dual-stator direct-drive permanent magnet wind generator according to claim 1, characterized in that: the dual-stator direct-drive permanent magnet wind generator adopts a series magnetic circuit structure, and through the permanent magnets, the composition passes through the Inner and outer stators, and a series magnetic circuit of the cup rotor, the first working air gap and the second working air gap. 4. The double-stator direct-drive permanent magnet wind-driven generator as claimed in claim 2, characterized in that: the double-stator direct-drive permanent-magnet wind-driven generator adopts a series magnetic circuit structure, and through the permanent magnets, the composition passes through the Inner and outer stators, and a series magnetic circuit of the cup rotor, the first working air gap and the second working air gap. 5. The double-stator direct-drive permanent magnet wind power generator according to claim 1 or 2 or 3 or 4, characterized in that: the permanent magnets arranged in a staggered arrangement with different N and S polarities are installed on the rotor core Inner and outer surfaces. 6. The double-stator direct-drive permanent magnet wind power generator as claimed in claim 1 or 2 or 3 or 4, characterized in that: the permanent magnets arranged in a staggered arrangement with different N and S polarities are installed inside and outside the rotor iron core to form in the slot. 7. The dual-stator direct-drive permanent magnet wind power generator according to claim 1 or 2 or 3 or 4, characterized in that: the number of slots of the inner and outer stators is the same, the number of pole pairs is the same, and the number of the inner and outer stators is the same. The multi-phase windings of the outer stator are in the form of single-pitch windings with fractional slots, corresponding to two anti-phase windings in the same phase. 8. The double-stator direct-drive permanent magnet wind power generator as claimed in claim 5, characterized in that: the number of slots of the inner and outer stators is the same, the number of pole pairs is the same, and the multi-phase windings of the inner and outer stators All adopt fractional slot single-pitch winding form, corresponding to two anti-phase windings in the same phase. 9. The double-stator direct-drive permanent magnet wind power generator as claimed in claim 6, characterized in that: the number of slots of the inner and outer stators is the same, the number of pole pairs is the same, and the multi-phase windings of the inner and outer stators All adopt fractional slot single-pitch winding form, corresponding to two anti-phase windings in the same phase. the

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