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Title:
PERMANENT MAGNET SYNCHRONOUS WIND-DRIVEN GENERATOR WITH MULTI-LAYER WINDING
Document Type and Number:
WIPO Patent Application WO/2012/119542
Kind Code:
A1
Abstract:
A permanent magnet synchronous wind-driven generator with a multi-layer winding comprises a casing (1) and an end cap (2). At least two circles of ring-shaped stator cores are fixedly connected to the interior of the casing. A coil winding (4) is provided on each stator core. A rotor shaft (5) arranged in the casing is rotatably coupled to the casing and dynamically coupled to a power device. A rotor (6) fixedly connected to the rotor shaft is arranged between adjacent stator cores. A plurality of permanent magnets (7) distributed uniformly at intervals are connected to the surface of the rotor near to the coil windings. The generator has the advantages of compact structure, small volume, large power and convenience in transport and installation.

Inventors:
ZHANG QIZHI (CN)
YANG XISHAN (CN)
YU KETAO (CN)
Application Number:
PCT/CN2012/071985
Publication Date:
September 13, 2012
Filing Date:
March 06, 2012
Export Citation:
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Assignee:
SHANDONG SWISS ELECTRIC CO LTD (CN)
ZHANG QIZHI (CN)
YANG XISHAN (CN)
YU KETAO (CN)
International Classes:
H02K16/04; H02K1/27
Foreign References:
CN101917101A2010-12-15
CN201956848U2011-08-31
CN102111045A2011-06-29
CN1929263A2007-03-14
Attorney, Agent or Firm:
RUNPING & PARTNERS (Yingu MansionNo. 9 Beisihuanxilu, Haidian District, Beijing 0, CN)
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Claims:
Claims

1. A permanent magnet synchronous wind generator with multi-layer winding, comprising a casing (1) and an end cap (2), characterized in that: at least two circles of ring-shaped stator cores (3) fixedly connected to the interior of the casing (1); a coil winding (4) arranged on each stator core (3); a rotor axis (5) arranged in the casing (1) rotatably coupled to the casing (1) and dynamically coupled to a power device; a rotor (6) fixedly connected to the rotor axis (5) arranged between adjacent stator cores (3); and a plurality of permanent magnets (7) uniformly distributed at intervals are connected to a surface of the rotors (6) near to the coil windings (4).

2. The permanent magnet synchronous wind generator with multi-layer winding according to claim 1, characterized in that: the stator cores (3) are provided with internal and external circles.

Description:
PERMANENT MAGNET SYNCHRONOUS WIND GENERATOR WITH MULTILAYER WINDING

Field of Invention

The present invention relates to a generator for wind-generation, in particular a permanent magnet synchronous wind generator with multi-layer winding.

Background of Invention

Along with the continuous improvements of the wind power technology, the power of the generator used for the wind generator is increasing. At present, all the high power permanent magnet synchronous generators used for wind power generation adopt the structure of one-layer winding with a one-layer permanent magnet. Such a structure may satisfy the demands for lifting and transportation, when the power is lower (e.g. <3MW). However, as the power of the single machine increases, the volume and weight of the generators as well as the inner capacity of the engine also increase, which causes much inconvenience to the transportation and installation, such as that the cost is too high with the usage of a super huge transportation or lifting equipment, and an even larger generator may just not be able to be transported and installed, as even larger lifting equipments for installation cannot be found. To overcome the problem of transportation and lifting, a separated structure is adopted in the large permanent magnet synchronous generator. Although such structure solves the problem of transportation, it leads to significant difficulties to on-site installation and insulation.

Summary of the Invention

The technical problem to be solved by the present invention is to provide a compact- structured wind generator in view of the above deficiencies. The generator sufficiently utilizes the free space inside the generator. Without increasing the overall volume of the generator, the rated power of the generator is increased which facilitates the resolution of on-land transportation issues for large-scale permanent magnet synchronous generator, with creating additional installation and commissioning difficulties. To solve the above-mentioned technical problem, the present invention provides a permanent magnet synchronous wind generator with multi-layer winding which includes the following structure: it contains a casing and an end cap, characterized in that at least two circles of ring-shaped stator cores are fixedly connected to the interior of the casing. A coil winding is arranged on each stator iron core. A rotor axis is arranged in the casing which is rotatably coupled to the casing and dynamically coupled to a power device. A rotor fixedly connected to the rotor axis is arranged between adjacent stator cores. A plurality of permanent magnets uniformly distributed at intervals is connected to a surface of the rotors near to the coil windings.

The stator iron core is provided with the internal and external circles.

The present invention, without increasing the overall volume of the existing wind generator, fully utilizes the remaining space inside the generator by arranging two or more circles of the stator iron cores,. Each iron core is provided with coil winding and a rotor is provided between the adjacent stator iron cores. That is to say, each circle of the coil winding of the stator iron core can generate electricity such that the power of the generator is highly improved without changing the overall size of the generator.

In conclusion, the present invention has the advantages of compact structure, small volume, large power and convenience in transport and installation.

Brief Description of Figures

Embodiments of the invention will now be described with reference to the accompanying drawings of which:

Figure 1 is a schematic diagram of an embodiment of the present invention;

Figure 2 is a sectional view along the line A-A shown in figure 1 and after removing the coil winding;

Figure 3 is a schematic diagram of another embodiment;

Figure 4 is a schematic diagram of the third embodiment. Detailed Description of the Preferred Embodiments

A first embodiment of this invention is described with reference to Figures 1 and 2. A permanent magnet synchronous wind generator with multi-layer winding contains a casing 1 and an end cap 2. Two circles of stator cores 3 are fixedly connected to and concentrically arranged in the interior of the casing 1. The stator iron core 3 is ring-shaped in general, and each circle of the stator iron cores 3 is provided with coil winding 4. The stator iron core 3 is composed of a casing of iron core 31 and a plurality of fins 32 arranged on the internal peripheral surface or the external peripheral surface of the casing of iron core 31 at intervals. The trend of the fin 32 is parallel to the radial direction of the casing of iron core 31. The benefit of this structure is that it is convenient for processing. In details, the fins 32 of the internally located stator iron core 3 are distributed on the inner peripheral surface of the iron core 31, whereas the fins 32 of the of the externally located stator iron 3 are distributed on the external peripheral surface of the iron core 31. The gap between the adjacent fins 32 forms the winding slot 33 for containing the coil winding 4. The method of mounting the coil winding 4 on the stator iron core 3 or the winding method is a prior art technology which will not be elaborated herewith. Inside the casing 1, an inner support casing 8 and a core axis 9 are fixedly connected to the casing. The core axis 9 is arranged inside the inner support casing 8 and is arranged concentrically to the inner support casing 8. The externally located stator iron core 3 is embedded on the inner side wall of the casing, and the internally located stator iron core 3 is sleeved on the outer side wall of the inner support casing 8. The core axis 9 is rotatably coupled to the axle housing i.e. the rotor axis 5 through the bearing 10, where the rotor axis 5 is dynamically coupled to the power unit of the wind generator. One end of the rotor axis 5 extends out of the end casing 2 for dynamic coupling. Between two circles of the stator iron cores 3, there is provided with a cylindrical rotor 6, which is fixed to the rotor axis 5. At the surface of the rotor 6 close to the coil winding 4, in other words on both its internal and external peripheral surfaces, a plurality of permanent magnets 7 are evenly and fixedly connected with at intervals.

After installing the wind generator having the aforesaid structure in the wind generator systems, the rotor axis 5 of the wind generator is dynamically coupled to the power unit of the wind generator systems. The power unit drives the rotor axis 5 to operate the rotation of the rotor 6 such that a rotary magnet field is created. The coil winding 4 cuts the magnet line to create an alternating current. The alternating currents created by the coil winding 4 on the two circles of the stator iron cores 3 are transmitted to two AC current converters respectively, which regulate the alternating currents to meet the requirements of the transmission grid on frequency and voltage. The generators are then combined to the grid.

The second embodiment of this invention is described with reference to Figure 3. Figure 3 is a cross- sectional illustration of the generator after removing the coil winding. The generator in such structure is an improved one on the basis of the first embodiment, that is to say, a concentrically arranged outer support casing 11 is provided outside the inner support casing 8. The outer support casing 11 is also fixedly connected to the casing 1 and the stator iron cores 3 with the coil windings are respectively connected to the outside wall of the inner support casing 8, the inside wall of the outer support casing 11 and the inside wall of the casing 1. The rotor 6 fixedly connected to the rotor axis 5 is located between two stator iron cores 3 on the inner side, and a plurality of permanent magnets 7 are evenly and fixedly connected to the internal and external peripheral surfaces of the rotor 6 at intervals. Between the outer-side stator iron core 3 and the outer support casing 11, there is provided a cylindrical outer rotor 12 fixedly connected to the rotor axis 5. A plurality of permanent magnets 7 are evenly and fixedly connected to the out peripheral surface of outer rotor 12 at intervals. The alternating currents formed by the coil winding on the three circles of the stator iron cores 3 are distributed and transmitted to three converters, which regulates the alternating currents to meet the requirements of the transmission grid on frequency and voltage. The generators are then combined to the grid.

The third embodiment of this invention is described with reference to figure 4. Figure 4 is a cross-sectional illustration of the generator removing the coil winding. The generator in such structure is an improved one on the basis of the second embodiment, that is to say, a circle of the stator core 3 equipped with a coil winding is connected to the outer side wall of the outer support casing 11. This stator iron core 3 is located inside the outer rotor 12. Correspondingly, a plurality of permanent magnets 7 are evenly and fixedly arranged on the internal peripheral surface of the outer rotor 12. In other words, the generator in such structure has four circles of the stator iron cores 3. The alternating currents formed by the coil winding on the three circles of the stator iron cores 3 are distributed and transmitted to four converters, which regulates the alternating currents to meet the requirements of the transmission grid on frequency and voltage. The generators are then combined to the grid.

Exemplifying the generators with two circles of stator iron cores 3, three circles of stator iron cores 3 and four circles of stator iron cores 3, the present invention explains the inventive concept, but not intends to provide limitation to the present invention. Other generators with more circles of the stator iron cores also fall within the scope of protection of the present invention.