CN202167906U

CN202167906U - A Novel Doubly Salient Permanent Magnet Direct Drive Wind Turbine

Info

Publication number: CN202167906U
Application number: CN2011203072588U
Authority: CN
Inventors: 孙雨萍; 李陶波
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2011-08-23
Filing date: 2011-08-23
Publication date: 2012-03-14
Anticipated expiration: 2021-08-23

Abstract

The utility model discloses a novel double-salient pole permanent magnet direct-drive wind power generator. The generator is a 6/14-pole double-salient pole permanent magnet motor. Concentrated windings are respectively arranged on the salient poles of six stator cores. Two opposite concentrated windings are connected in series to form a phase, and permanent magnets are respectively arranged on the end faces of the six stator core salient poles; the adjacent permanent magnets on the adjacent stator core salient poles have the same polarity, and the stator core salient poles The arc length is 49°, the arc length of each magnetic pole on the salient pole of the stator core is 12°, the arc length of the salient pole of the rotor iron core on the motor shaft 5 is 10°, and the angle of the rotor chute is 8.57°. The permanent magnets are two pairs of neodymium-iron-boron magnets with a thickness of 2.5mm arranged alternately. The beneficial effect of the utility model: it puts the permanent magnet with high magnetic energy on the surface of the salient pole of the stator core, and the permanent magnet is easy to install; through the comparison of the motor performance curves under different sizes, the more suitable combination of stator and rotor sizes can be determined. parameters to obtain better motor performance and material utilization.

Description

A kind of novel doubly-salient permanent magnet direct-driving aerogenerator

Technical field

The utility model relates to technical field of wind power generator, relates in particular to a kind of novel doubly-salient permanent magnet direct-driving aerogenerator.

Background technology

In recent years, because global energy is in short supply and the reinforcement of environmental consciousness, clean energy resource has obtained very big development.

Wind power generation develops rapidly in worldwide as a kind of principal mode that clean energy resource utilizes, and its technology also reaches its maturity.In wind generator system, wind-driven generator occupies critical role as one of critical component in system, and performance is effect mainly.Make a general survey of the development of wind turbine generator in the world, more and more be tending towards on the one hand maximizing, make the wind-driven generator single-machine capacity constantly increase; On the other hand, very most of manufacturer is conceived to the exploitation of small-sized wind power generator, and reason is mostly small-sized wind power generator is civilian; It is little to have size, easy for installation, and cost is low, the efficient advantages of higher; And have the various regions of being suitable for and climatic environment, use characteristics more widely.

Though the wind-driven generator that uses at present has above-mentioned advantage, is mostly common asynchronous moter and synchronous machine, therefore there is certain weak point:

1, wind generator system often need be provided with mechanical variable speed device for obtaining low rate start, has increased the complexity of equipment thus, has reduced the reliability of equipment operation.The more important thing is that the mechanical variable speed device of being set up certainly exists the problem of energy conversion efficiency, the efficient of whole wind generator system is reduced.

2, under the traditional approach; Adopt empirical equation to the stator and rotor size combinations to wind-driven generator more; Parameters such as gas length, permanent magnet thickness are confirmed, have the artificial factor of setting, and make motor performance and stock utilization fundamentally obtain optimum Match.

The utility model content

The purpose of the utility model is exactly in order to address the above problem, and a kind of novel doubly-salient permanent magnet direct-driving aerogenerator is provided.It has winding utilization height, simple in structure, advantage that moment of inertia is little.

To achieve these goals, the utility model adopts following technical scheme:

A kind of novel doubly-salient permanent magnet direct-driving aerogenerator; This generator is 6/14 utmost point doubly salient permanent magnet motor; Promptly comprise 14 rotor core salient poles and 6 stator core salient poles; Be respectively arranged with concentrated winding above six stator core salient poles, two relative concentrated windings in series of position constitute a phase each other, are respectively arranged with permanent magnet on six stator core salient pole pole shoe end faces; Adjacent permanent magnet polarity on the adjacent stators iron core salient pole is identical; Each stator core salient pole arc length is 49 °; Each the permanent magnet arc length that is located on the stator core salient pole is 12 °, and the rotor core salient pole arc length that is located on the motor shaft is 10 °, and the rotor chute angle is 7 °～9 °.

The said rotor chute angle of the utility model the best is 8.57 °.On each stator core salient pole, described permanent magnet is that the thickness that two pairs of polarity are arranged is the ndfeb magnet of 2.5mm.

The beneficial effect of the utility model:

This novel doubly-salient permanent-magnetic wind driven generator is a direct-drive type; Need not mechanical variable speed device; Improved the efficient and the operational reliability of unit, except that advantage, compared with traditional doubly salient permanent magnet motor with general magneto; It is located at the permanent magnet of high magnetic energy on the pole shoe end face of stator core salient pole, makes that permanent magnet is easy to install; Along with the rotor rotation, concentrate the permanent magnet flux of winding institute interlinkage to change polarity on the doubly salient permanent magnet motor stator, this means to produce the flux change bigger than magnetic flux pulsating.

Calculate 6/14 utmost point doubly salient permanent magnet motor size; Through changing key dimension such as stator and rotor arc length, gas length and the permanent magnet thickness etc. of motor; The situation of change of the magnetic linkage that plays a decisive role to the winding inductance in the motor, cogging torque and to the size and the waveform of induced electromotive force; Carry out comparatively detail analysis and research, and obtained satisfied result.

Analyzed more size combinations; Design feature in view of doubly salient permanent magnet motor; Situation under the various sizes combination has all been carried out finite element analysis; Comparatively suitable stator and rotor size combinations has finally been confirmed in contrast through to the motor performance curve that obtains under the different size, and parameters such as gas length, permanent magnet thickness are so that obtain more excellent motor performance and stock utilization.

Description of drawings

Fig. 1 is 6/14 utmost point stator sectional view.

Fig. 2 is the rotor sectional view.

Fig. 3 is the sectional view of whole motor.

When Fig. 4 is the collocation of different stator and rotor iron core salient pole arc length, to the influence of magnetic linkage amplitude.

When Fig. 5 is the collocation of different stator and rotor iron core salient pole arc length, to the influence of cogging torque amplitude.

Fig. 6 is the influence of rotor tilt angle to cogging torque.

Fig. 7 is the influence of rotor tilt angle to the magnetic linkage amplitude.

Fig. 8 is the relation of rotor tilt angle and skew slot factor.

Regulator curve when Fig. 9 is 214rpm for rotating speed.

Figure 10 is the machine operation principle schematic.

Wherein 1. stator core salient poles are 2. concentrated winding, 3. permanent magnet, 4. air gap, 5. motor shaft, 6. rotor core salient pole.

Embodiment

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

Among Fig. 1, Fig. 2, Fig. 3; A kind of novel doubly-salient permanent magnet direct-driving aerogenerator; This generator is 6/14 utmost point doubly salient permanent magnet motor, promptly comprises 14 rotor core salient poles 6 and be respectively arranged with above 1, six stator core salient pole 1 of 6 stator core salient poles concentrating winding 2; Two relative concentrated winding 2 series connection of position constitute a phase each other, are respectively arranged with permanent magnet 3 on six stator core salient pole 1 pole shoe end faces; Adjacent permanent magnet 3 polarity on the adjacent stators iron core salient pole 1 are identical; Each stator core salient pole 1 arc length is 49 °; Each permanent magnet 3 arc length that is located on the stator core salient pole 1 are 12 °, and rotor core salient pole 6 arc length that are located on the motor shaft 5 are 10 °, and the rotor chute angle is 7 °～9 °.

Said rotor chute angle the best is 8.57 °.

On each stator core salient pole 1, described permanent magnet 3 is that the thickness that two pairs of polarity are arranged is the ndfeb magnet of 2.5mm.

Have air gap 4 between permanent magnet 3 and the stator core salient pole 1.

When Fig. 4 is different stator core salient pole 1, the collocation of rotor core salient pole 6 polar arcs, to the influence of magnetic linkage amplitude.

Analyze of the influence of stator and rotor iron core salient pole arc length degree, to confirm best stator and rotor iron core salient pole arc length degree to motor magnetic linkage amplitude, cogging torque.

Learn from Fig. 4 and Fig. 5 analysis-by-synthesis, 49 ° of stator core salient pole 1 arc length, rotor core salient pole 6 arc length are more suitable selection for 10 °.

The biconvex electrode structure of doubly salient permanent magnet motor has determined that its cogging torque is bigger in addition; Therefore work as motor application in fashionable to the higher field of torque request; Must reduce the influence of cogging torque through skewed slot; The angle that tilts is 2 π/S, and wherein S is the least common multiple of stator core salient pole 1 and rotor core salient pole 6.Because model machine is 6/14 utmost point, so S=42, the cycle of cogging torque is 2 π/42, and corresponding mechanical angle is 8.57 °.

We are equally divided into 5 sections to rotor in this motor, differ from a mechanical angle between any two, have been equivalent to rotor tilt 8.57 °; We can be in 1.714 ° respectively with rotor, and 3.428 °, 5.142 °; 6.856 °, the magnetic linkage mean value of gained is represented on 8.57 ° of these 5 positions.

Fig. 6 changes the influence to cogging torque for the rotor tilt angle.

Fig. 7 changes the influence to the magnetic linkage amplitude for the rotor tilt angle.

The relation of Fig. 8 rotor tilt angle and skew slot factor.

The amplitude of the electromotive force that obtains after the rotor tilt is compared with the electromotive force before not tilting, just can be obtained the skew slot factor of this moment.The skew slot factor that calculates thus and the relation of rotor tilt angle are as shown in Figure 8: from figure, be not difficult to find out the increase along with the rotor tilt angle, the value of skew slot factor declines by a big margin.

Being taken all factors into consideration by Fig. 6, Fig. 7 and Fig. 8, is 8.57 ° so select the rotor chute angle.

External characteristic curve when Fig. 9 is rated speed 214rpm for the strip resistance load speed, its characteristic curve show that the voltage change ratio of generator is little.

More than research shows in the doubly salient permanent magnet motor project organization that stator core salient pole 1 arc length and rotor core salient pole 6 arc length are to influence the topmost design variable of motor performance.The stator and rotor salient pole arc length that changes doubly salient permanent magnet motor can cause bigger influence to motor properties, therefore can improve motor performance through selecting suitable size.As far as the doubly salient permanent magnet motor of 6/14 structure, 49 ° of stator core salient pole 1 arc length, rotor core salient pole 6 arc length are more suitable selection for 10 °, motor properties is preferable.

Among Figure 10, because the inductance of doubly salient permanent magnet motor is less, so should ignore the armature reaction influence when analyzing magnetic field.And turning to of regulation motor to counterclockwise; Be positioned at the moment of 10a position when rotor; Be the equilbrium position of motor this moment; The center line of rotor tooth and stator tooth center line coincide, and permanent magnet 3 magnetic linkages only through stator core salient pole 1 and rotor core salient pole 6 closures, do not have magnetic flux and A phase winding intersecting chain.Rotation along with rotor; The magnetic flux of A phase winding interlinkage increases gradually, when reach Figure 10 b shown in the position, rotate through 1/2 permanent magnet, 3 arc length; Permanent magnet 3 center lines that promptly center line of 2 rotor tooths is corresponding with it respectively coincide; At this moment, the magnetic flux of A phase winding institute interlinkage reaches maximum, and the induced electromotive force of A phase winding is zero.Rotor continues to be rotated counterclockwise, and A phase winding magnetic linkage begins to reduce, and when rotor turns over 1/2 permanent magnet arc length again, arrives the moment of 10c position, and the magnetic flux of A phase winding institute interlinkage is reduced to zero, and this is that motor arrives the equilbrium position for the second time.Rotor turns over the position that 1/2 permanent magnet arc length arrives 10d more counterclockwise, and this moment, A phase magnetic linkage reached reverse maximum, the induced electromotive force vanishing.Rotor continues rotation 1/2 permanent magnet 3 arc length, arrives the position of Figure 10 a, repeats next circulation.So 6/14 utmost point doubly salient permanent magnet motor rotor turns in the process of 1 rotor core salient pole 6 tooth pitch, the magnetic flux of the every phase winding of motor institute interlinkage and induced electromotive force are bipolarity and change one-period.

Though the above-mentioned accompanying drawing that combines is described the embodiment of the utility model; But be not restriction to the utility model protection range; One of ordinary skill in the art should be understood that; On the basis of the technical scheme of the utility model, those skilled in the art need not pay various modifications that creative work can make or distortion still in the protection range of the utility model.

Claims

1. A novel doubly salient permanent magnet direct drive wind generator, characterized in that the generator is a 6/14 pole doubly salient permanent magnet motor, including 14 rotor core salient poles and 6 stator cores Salient poles, six stator core salient poles are respectively provided with concentrated windings, two concentrated windings opposite to each other are connected in series to form a phase, and permanent magnets are respectively arranged on the end faces of the six stator core salient pole pole shoes; adjacent stators Adjacent permanent magnets on the salient poles of the iron core have the same polarity, the arc length of each salient pole of the stator iron core is 49°, and the arc length of each permanent magnet set on the salient poles of the stator iron core is 12°, and it is set on the motor shaft The arc length of the salient pole of the rotor core is 10°, and the angle of the rotor chute is 7°～9°.

2. A novel doubly salient permanent magnet direct-drive wind power generator as claimed in claim 1, wherein the angle of the rotor skew is 8.57°.

3. A novel doubly salient permanent magnet direct-drive wind power generator as claimed in claim 1, characterized in that, on the salient poles of each stator core, the permanent magnets are arranged with two pairs of polarities staggered NdFeB magnets with a thickness of 2.5mm.