Patent Description:
A plurality of permanent magnets are mounted on a rotor of a large-size permanent magnet wind power generator, where the permanent magnets of rare earth such as NdFeB (Neodymium-Iron-Boron) are taken as its magnetic pole. When the power generator is in operation, the permanent magnet may easily fall off from the rotor due to various factors such as temperature, humidity, vibration and alternating electromagnetic force in the working environment, thus affecting safe and reliable operation of the power generator. Therefore, the fixing and encapsulating manner of a magnetic steel of the rotor of the permanent magnet wind power generator is very critical.

A common permanent magnet fixing and encapsulating method at present is described below: after a permanent magnet and a rotor are assembled together, a glass fiber cloth is adhered to a surface of a magnetic pole, and then epoxy resin filling is performed for the magnetic pole by vacuum glue injection. After the resin is cured, the glass fiber cloth and the surface of the magnetic pole are bonded integrally to fix and protect the permanent magnet. In this manner, the structure is simpler and material costs are lower. However, because the epoxy resin has a high viscosity, the epoxy resin will encounter a large resistance when passing through a flow channel and thus air cannot be completely expelled smoothly. Further, faults may easily occur to a surface and an interior of an anti-corrosion layer. In this case, moisture in the air may enter the interior of the magnetic pole, and the permanent magnet may be corroded or pulverized, and finally fall off from the rotor and enter into air gap. In this case, chamber-sweeping may occur to the power generator and even the entire power generator may be damaged. Another common permanent magnet fixing method is described below: a permanent magnet is encapsulated in a magnetic pole module box, radial holes are opened respectively on the magnetic pole module box and a rotor, and then the magnetic pole module box is radially fixed on the rotor using bolts. This method is easy to operate but has many defects: the magnetic pole module box must be mounted before the rotor and a stator are assembled, and assembly difficulty is greatly increased due to the strongly-magnetic permanent magnet; the strong magnetism of the magnetic pole module leads to its positioning difficulty and low mounting efficiency, and thus the magnetic pole module can be accurately mounted to a designated position only by experienced technicians with proper tools; when the power generator is in operation, a strong tangential force received by the magnetic pole module must be completely borne by bolts such that a large number of bolts and matching bolt holes should be provided; further, there is a possibility that the bolts may break after a long time of operation.

<CIT> provides a generator rotor capable of fixing a magnetic pole module in an axial direction and a circumferential direction of a yoke, where the generator rotor includes: a yoke, a plurality of pressing strips, magnetic pole modules and stoppers. First, a stopper is placed at one end (e.g., the upper end) of two adjacent pressing strips along the axial direction of the yoke. Then, the first projections of the magnetic pole module are inserted into the mutually opposite concave portions of the two adjacent pressing strips and pushed in from the bottom upward until resting against the stopper. Finally, the assembly of the magnetic pole module is completed by fixing the other stopper on the magnetic yoke at the other end of the two adjacent pressing strips.

<CIT> provides an outer rotor construction for the generator of a wind turbine. The outer rotor construction includes a plurality of rotor housing sections that closely fit together. Each magnet pole piece in <CIT> is mounted on a base plate accommodated in a specified shape slot of each rotor housing section.

<CIT> provides a special-shaped magnetic steel component structure of wind power generator. The special-shaped magnetic steel component structure includes a special-shaped base plate, a magnetic steel, and a protective box. When the special-shaped magnetic steel component is installed, first pressing strips are pre-fixed on a rotor housing by bolts, the rotor housing is pre-punched with bolt holes, the magnetic steels are pushed between two columns of pressing strips through a magnetic steel component installation tooling, then the bolts are tightened.

To sum up, the magnetic pole fixing device of the permanent magnet wind power generator and the permanent magnet wind power generator in the prior art have the shortcomings of high assembly difficulty of the rotor and the stator, high mounting difficulty of the magnetic pole module and low long-term reliability of the magnetic pole module fixing device.

In order to solve the shortcomings of high mounting difficulty of a magnetic pole module and low long-term reliability of a magnetic pole module fixing device in the prior arts, the present disclosure provides a magnetic pole fixing device of a permanent magnet wind power generator and a permanent magnet wind power generator.

To solve the above technical problems, the present disclosure employs the following solutions.

Provided is a magnetic pole fixing device of a permanent magnet wind power generator as defined in claim <NUM>, which is used to fix a plurality of magnetic pole modules on a rotor of the permanent magnet wind power generator.

In this solution, when one of the magnetic pole modules is located between adjacent two of the first fixing block assemblies, and the left second fixing block and the right second fixing block are embedded between adjacent two of the first fixing blocks of the corresponding first fixing block assembly, movements of the magnetic pole module along the circumferential direction and the axial direction of the rotor are both limited. A radial limiting assembly further limits the movement of the magnetic pole module along the radial direction of the rotor. In this way, one of the magnetic pole modules is fixedly and tightly mounted on the rotor, and easy to operate and dismount. In this case, the prior mounting can be easily performed and the subsequent maintenance and servicing are facilitated. The radial limiting assembly further limits the movement of the magnetic pole module along the axial direction of the rotor in addition to limiting the movement of the magnetic pole module along the radial direction of the rotor.

In this solution, a staggered disposal of the left second fixing block and the right second fixing block along the length direction of the magnetic pole module guarantees the fixing reliability of the magnetic pole module and the rotor and saves space.

In this solution, the magnetic pole module is mounted on the rotor by inserting the radial fastener into the second radial connection hole and the first radial connection hole in sequence.

In this solution, the magnetic pole module is mounted on the rotor by inserting the axial fastener into the first axial connection hole and the second axial connection hole.

In this solution, for adjacent two of the magnetic pole modules along the circumferential direction of the rotor, the left second fixing block of one of the adjacent two magnetic pole modules and the right second fixing block of the other of the adjacent two magnetic pole modules are stacked along the thickness direction of the magnetic pole module, such that space can be saved while the fixing reliability of the magnetic pole module and the rotor is guaranteed.

In this solution, for the adjacent two magnetic pole modules along the circumferential direction of the rotor, the sum of the thicknesses of the left second fixing block of one of the adjacent two magnetic pole modules and the right second fixing block of the other of the adjacent two magnetic pole modules is smaller than or equal to the thickness of the magnetic pole module, so as to guarantee the fixing reliability of the magnetic pole module and the rotor.

In this solution, when the first fixing block is a solid fixing block, the first fixing block may be welded to the side surface of the rotor adjacent to the air gap or integrally formed with the rotor by groove milling. Both of the two manners can realize the fixing of the first fixing block on the rotor easily and reliably, and the first fixing block has a higher strength than a radial bolt in the prior art, thus eliminating the possibility that the bolts may break after a long time of operation. When the first fixing block is not a solid fixing block, the first fixing block may be welded to the rotor by welding.

In this solution, the thickness of each of the left second fixing block and the right second fixing block is smaller than or equal to the thickness of the magnetic pole module to ensure the fixing reliability of the magnetic pole module and the rotor.

In this solution, the axial distance between the first fixing blocks may be set such that the left second fixing block and the right second fixing block of the magnetic pole module can both be embedded between adjacent two first fixing blocks of the corresponding first fixing block assembly.

Provided is a permanent magnet wind power generator as defined in claim <NUM>.

The present disclosure has the following beneficial effects: in the present disclosure, a magnetic pole fixing device of a permanent magnet wind power generator different from the prior art is adopted, and a strong tangential force received by the magnetic pole module is borne by the first fixing block, thus avoiding the manufacturing difficulty brought about by the use of a large number of radial bolts for fixing the magnetic pole module in the prior art. Further, the first fixing blocks have a larger force-receiving area and receive force more uniformly. The first fixing blocks are preferably fixed to the rotor by welding or integrally formed with the rotor by groove milling, such that a first fixing block has a higher strength than that of a radial bolt of the prior art, effectively eliminating the possibility of bolt breakage. Furthermore, based on the fixing manner of the first fixing blocks, it is not required to mount a limiting device at an end of one column of axially-arranged magnetic pole modules. Further, each magnetic pole module is independently positioned by use of the first fixing blocks and the second fixing block assembly, thus facilitating the positioning and mounting and effectively solving the shortcomings of high mounting difficulty of magnetic pole module and low long-term reliability of the magnetic pole module fixing device in the prior art.

Numerals of the drawings are described below:.

The present disclosure will be further described below in combination with specific embodiments but not limited to these embodiments.

The present disclosure provides a magnetic pole fixing device of a permanent magnet wind power generator and a permanent magnet wind power generator to fix a magnetic pole module on a rotor. As shown in <FIG>, the magnetic pole fixing device includes a plurality of first fixing block assemblies <NUM>, a plurality of second fixing block assemblies <NUM> and a plurality of radial limiting assemblies <NUM>.

A plurality of first fixing block assemblies <NUM> are disposed on a side surface of a rotor <NUM> adjacent to an air gap and extend toward an exterior of the rotor <NUM>, and the air gap is a gap between the rotor <NUM> and a stator. A plurality of first fixing block assemblies <NUM> are disposed along a circumferential direction of the rotor <NUM> and spaced apart from each other, a distance between two adjacent first fixing block assemblies <NUM> is equal to a width of the magnetic pole module <NUM>, and each first fixing block assembly <NUM> includes a plurality of first fixing blocks <NUM> disposed along an axial direction of the rotor <NUM> and spaced apart from each other.

A plurality of second fixing block assemblies <NUM> are disposed at two opposing side surfaces of the magnetic pole module <NUM> respectively, each second fixing block assembly <NUM> includes one left second fixing block <NUM> and one right second fixing block <NUM>, the left second fixing block <NUM> and the right second fixing block <NUM> are staggered along a length direction of the magnetic pole module <NUM>, and the length direction of the magnetic pole module <NUM> is parallel to the axial direction of the rotor <NUM>. The magnetic pole module <NUM> is accommodated between two adjacent first fixing block assemblies <NUM> which limit the movement of the magnetic pole module <NUM> accommodated therein along the circumferential direction of the rotor <NUM>. The left second fixing block <NUM> and the right second fixing block <NUM> are embedded between two adjacent first fixing blocks <NUM> of the corresponding the first fixing block assembly <NUM>, and the corresponding first fixing blocks <NUM> limit the movement of the magnetic pole module <NUM> along the axial direction of the rotor <NUM>. In order to ensure the left second fixing block <NUM> and the right second fixing block <NUM> at two side surfaces of the magnetic pole module <NUM> can both be embedded between two adjacent first fixing blocks <NUM> included in the corresponding first fixing block assembly <NUM>, a distance between two adjacent first fixing blocks <NUM> included in any first fixing block assembly <NUM> along the axial direction of the rotor <NUM> is smaller than <NUM>/<NUM> of the length of the magnetic pole module <NUM>.

A strong tangential force received by the magnetic pole module <NUM> is borne by the first fixing block <NUM>, thus avoiding manufacturing difficulty brought about by use of a large number of radial bolts in fixing the magnetic pole module <NUM> in the prior art. Furthermore, based on the fixing manner of the first fixing blocks <NUM>, it is not required to mount a limiting device at an end of one column of axially-arranged magnetic pole modules <NUM>. Further, each magnetic pole module <NUM> is independently positioned by use of the first fixing blocks <NUM> and the second fixing block assembly <NUM>, thus facilitating the positioning and mounting.

The radial limiting assembly <NUM> is used to limit the movement of magnetic pole module <NUM> along a radial direction of the rotor <NUM>. However, in addition to limiting the movement of the magnetic pole module <NUM> along the radial direction of the rotor <NUM>, the radial limiting assembly <NUM> may further limit the movement of the magnetic pole module <NUM> along the axial direction of the rotor <NUM>. The radial limiting assembly <NUM> includes a first radial connection hole <NUM>, a second radial connection hole <NUM> and a radial fastener. The first radial connection hole <NUM> is disposed on the rotor <NUM> and located between two adjacent first fixing blocks <NUM> included in the corresponding fixing block assembly <NUM>, and extends along the radial direction of the rotor <NUM>. The second radial connection hole <NUM> is disposed on the second fixing block assembly <NUM> and extends along a thickness direction of the magnetic pole module <NUM>. The thickness direction of the magnetic pole module <NUM> is parallel to the radial direction of the rotor <NUM>. When the magnetic pole module <NUM> is accommodated in the rotor <NUM>, the movement of the magnetic pole module <NUM> along the radial direction of the rotor <NUM> is limited by inserting the radial fastener into the second radial connection hole <NUM> and the first radial connection hole <NUM> in sequence. The radial fastener is mainly used to limit the movement of the magnetic pole module <NUM> along the radial direction of the rotor <NUM>. Further, a radial inward force received by the magnetic pole module <NUM> is far smaller than the tangential force and only generated occasionally.

It is noted that the specific structure of the radial fastener is not provided in the embodiment. Therefore, those skilled in the art may use a well-known radial fastener in the prior art, for example, a bolt.

The first fixing block <NUM> is a solid fixing block which may be welded to the side surface of the rotor <NUM> adjacent to the air gap or integrally formed with the rotor <NUM> by groove milling. Both of the two manners can realize the fixing of the first fixing block <NUM> on the rotor <NUM> easily and reliably, and the first fixing block <NUM> has a larger force-receiving area and receives force more uniformly, and thus the first fixing block <NUM> has a higher strength than a radial bolt in the prior art, thus eliminating the possibility that the bolts may break after a long time of operation.

The magnetic pole module <NUM> includes a seat <NUM>, a housing cover <NUM> and a permanent magnet <NUM>. The seat <NUM> and the housing cover <NUM> are enclosed into a housing <NUM>. The permanent magnet <NUM> is located inside the housing <NUM>. The left second fixing block <NUM> and the right second fixing block <NUM> are integrally formed with the seat <NUM>. A thickness of each of the left second fixing block <NUM> and the right second fixing block <NUM> is smaller or equal to the thickness of the magnetic pole module <NUM>, so as to ensure the fixing reliability of the magnetic pole module <NUM> and the rotor <NUM>.

The permanent magnet wind power generator further includes a rotor <NUM> and a magnetic pole module <NUM> as well as the above magnetic pole fixing device.

This embodiment is structurally identical to the embodiment <NUM> except that the number of the left second fixing blocks <NUM> and the right second fixing blocks <NUM> included in each second fixing block assembly <NUM> is different from that in the embodiment <NUM>; the radial limiting assembly <NUM> is different from that in the embodiment <NUM>; the thickness of the left second fixing block <NUM> and the right second fixing block <NUM> is different from that in the embodiment <NUM>.

As shown in <FIG>, each second fixing block assembly <NUM> includes two left second fixing blocks <NUM> spaced apart along the length direction of the magnetic pole module <NUM> and two right second fixing blocks <NUM> spaced apart along the length direction of the magnetic pole module <NUM>, and the left second fixing block <NUM> and the right second fixing block <NUM> are symmetrically disposed. For two adjacent magnetic pole modules <NUM> along the circumferential direction of the rotor <NUM>, the left second fixing block <NUM> of one of the two adjacent magnetic pole modules <NUM> and the right second fixing block <NUM> of the other of the two adjacent magnetic pole modules <NUM> are stacked along the thickness direction of the magnetic pole module <NUM>; the second radial connection hole <NUM> on the left second fixing block <NUM> of one of the two adjacent magnetic pole modules <NUM> and the second radial connection hole <NUM> on the right second fixing block <NUM> of the other of the two adjacent magnetic pole modules <NUM> are overlapped.

The radial limiting assembly <NUM> includes the second radial connection hole <NUM> and a radial fastener. For two adjacent magnetic pole modules <NUM> along the circumferential direction of the rotor <NUM>, one second radial connection hole <NUM> is disposed on the left second fixing block <NUM> of one of the two adjacent magnetic pole modules <NUM> and the other second radial connection hole <NUM> is disposed on the right second fixing block <NUM> of the other of the two adjacent magnetic pole modules <NUM>, and the second radial connection holes <NUM> extend along the thickness direction of the magnetic pole module <NUM>. The movement of the magnetic pole module <NUM> along the radial direction of the rotor <NUM> is limited by inserting the radial fastener into the second radial connection hole <NUM> on the left second fixing block <NUM> of one magnetic pole module <NUM> and the second radial connection hole <NUM> on the right second fixing block <NUM> of the adjacent magnetic pole module <NUM>. In this embodiment, the radial limiting assembly <NUM> is not limited to the second radial connection hole <NUM> and the radial fastener, and may also include a corresponding first radial connection hole <NUM> disposed on the rotor <NUM>, where the first radial connection hole <NUM> is overlapped with the second radial connection hole <NUM>. This way, the movement of the magnetic pole module <NUM> along the radial direction of the rotor <NUM> is limited by inserting the radial fastener into the second radial connection hole <NUM> and the first radial connection hole <NUM> in sequence, such that the magnetic pole module <NUM> is more stably fixed on the rotor <NUM>.

For two adjacent magnetic pole modules <NUM> along the circumferential direction of the rotor <NUM>, a sum of thicknesses of the left second fixing block <NUM> of one of the two adjacent magnetic pole modules <NUM> and the right second fixing block <NUM> of the other of the two adjacent magnetic pole modules <NUM> is smaller or equal to a thickness of the magnetic pole module <NUM>, so as to ensure the fixing reliability of the magnetic pole module <NUM> and the rotor <NUM>.

The embodiment is structurally identical to the embodiment <NUM> except that the radial limiting assembly <NUM> is different from that in the embodiment <NUM>. The radial connection in the embodiment <NUM> is changed to an axial connection to limit the movement of the magnetic pole module <NUM> along the radial direction of the rotor <NUM>; the manners of fixing the first fixing block <NUM> on the rotor <NUM> are fewer.

As shown in <FIG>, the radial limiting assembly <NUM> includes a first axial connection hole <NUM>, a second axial connection hole <NUM>, and an axial fastener. The first axial connection hole <NUM> is disposed on the first fixing block <NUM> and extends along the axial direction of the rotor <NUM>. The second axial connection hole <NUM> is disposed on the second fixing block assembly <NUM> and extends along the length direction of the magnetic pole module <NUM>. The movement of the magnetic pole module <NUM> along the radial direction of the rotor <NUM> is limited by inserting the axial fastener into the first axial connection hole <NUM> and the second axial connection hole <NUM>.

The first fixing block <NUM> is a hollow fixing block which may be welded to the side surface of the rotor <NUM> adjacent to the air gap to achieve the fixing of the first fixing block <NUM> on the rotor <NUM>. The first fixing block <NUM> has a larger force-receiving area and can receive force more uniformly, such that the first fixing block <NUM> has a higher strength than that of a radial bolt in the prior art, effectively avoiding the possibility that the bolt may break after a long time of operation.

This embodiment is structurally identical to the embodiment <NUM> except that the number of the left second fixing blocks <NUM> and the right second fixing blocks <NUM> included in each second fixing block assembly <NUM> is different from that in the embodiment <NUM>.

As shown in <FIG>, each second fixing block assembly <NUM> includes two left second fixing blocks <NUM> spaced apart along the length direction of the magnetic pole module <NUM> and two right second fixing blocks <NUM> spaced apart along the length direction of the magnetic pole module <NUM>.

Claim 1:
A magnetic pole fixing device of a permanent magnet wind power generator, for fixing a plurality of magnetic pole modules (<NUM>) on a rotor (<NUM>) of the permanent magnet wind power generator, wherein the magnetic pole fixing device of the permanent magnet wind power generator comprises:
a plurality of first fixing block assemblies (<NUM>), disposed on a surface of the rotor (<NUM>)adjacent to an air gap and extending toward an exterior of the rotor, wherein the plurality of first fixing block assemblies (<NUM>) are disposed along a circumferential direction of the rotor (<NUM>) and spaced apart from each other in said circumferential direction, and each of the first fixing block assemblies (<NUM>) comprises a plurality of first fixing blocks (<NUM>) disposed along an axial direction of the rotor (<NUM>) and spaced apart from each other in said axial direction;
a plurality of second fixing block assemblies (<NUM>), where each of the second fixing block assemblies (<NUM>) comprises at least one left second fixing block (<NUM>) and at least one right second fixing block (<NUM>), which are disposed at two opposing side surfaces of the magnetic pole module (<NUM>) respectively;
a plurality of radial limiting assemblies (<NUM>), configured to limit a movement of the magnetic pole modules (<NUM>) along a radial direction of the rotor (<NUM>);
wherein the air gap is a gap between the rotor (<NUM>) and a stator, an accommodation space for accommodating one of the magnetic pole modules (<NUM>) is formed between adjacent two of the first fixing block assemblies (<NUM>), and adjacent two of the first fixing block assemblies (<NUM>) limit a movement of the magnetic pole module (<NUM>) accommodated in the accommodation space along the circumferential direction of the rotor (<NUM>);
the left second fixing block (<NUM>) or the right second fixing block (<NUM>) is embedded between adjacent two of the first fixing blocks (<NUM>) in each of the first fixing block assemblies (<NUM>), to limit the movement of the magnetic pole module (<NUM>) along the axial direction of the rotor (<NUM>).