WO2012012978A1 - Magnetic steel for permanent-magnet direct-driven wind mill generator - Google Patents

Magnetic steel for permanent-magnet direct-driven wind mill generator Download PDF

Info

Publication number
WO2012012978A1
WO2012012978A1 PCT/CN2010/078361 CN2010078361W WO2012012978A1 WO 2012012978 A1 WO2012012978 A1 WO 2012012978A1 CN 2010078361 W CN2010078361 W CN 2010078361W WO 2012012978 A1 WO2012012978 A1 WO 2012012978A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
magnetic steel
magnetic
magnet direct
wind power
Prior art date
Application number
PCT/CN2010/078361
Other languages
French (fr)
Chinese (zh)
Inventor
武树森
贾大江
吕先明
李勇
Original Assignee
上海万德风力发电股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海万德风力发电股份有限公司 filed Critical 上海万德风力发电股份有限公司
Publication of WO2012012978A1 publication Critical patent/WO2012012978A1/en

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • H02K1/272Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278Surface mounted magnets; Inset magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1807Rotary generators
    • H02K7/1823Rotary generators structurally associated with turbines or similar engines
    • H02K7/183Rotary generators structurally associated with turbines or similar engines wherein the turbine is a wind turbine
    • H02K7/1838Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction

Definitions

  • the present invention relates to a magnetic steel for a generator, and more particularly to a magnetic steel for a permanent magnet direct drive wind power generator.
  • the permanent magnet synchronous generator can be divided into two types: outer rotor and inner rotor. We know the relationship between air gap, diameter and motor capacity. It is clear that the electrical performance of the same air gap and diameter of the motor, the outer rotor structure and the inner rotor structure is indistinguishable.
  • the magnet of the permanent magnet motor of the inner rotor type is fixed on the outer side or the outer surface of the rotor. If the permanent magnet of the permanent magnet motor of the inner rotor is fixed on the outer surface of the inner rotor, a pressure ring is generally added outside the permanent magnet. Used to protect the magnet. Another method is to fasten the magnet to the dovetail groove on the specially machined rotor and secure it with a wedge. But no matter how it is fixed, its processing requirements are very high and strict. This makes processing difficult and costly.
  • the first method is to use a pressure ring on the outer surface of the permanent magnet to protect the magnet if the permanent magnet of the permanent magnet motor of the inner rotor is fixed on the outer surface of the inner rotor.
  • Another method is to fasten the magnet to the dovetail groove on the specially machined rotor and secure it with a wedge.
  • the processing requirements are very high and strict. This makes processing difficult and costly.
  • the magnetization direction of the permanent magnet is nearly perpendicular to the air gap flux axis and far from the air gap, and the magnetic flux leakage is larger than the radial structure.
  • the permanent magnets are in parallel state.
  • the magnetic flux per pole of the generator is provided by two rare earth permanent magnets, which can improve the air gap magnetic density, especially in the case of a large number of poles.
  • the tangential rotor magnetic circuit structure can be divided into a tangential collar structure and a tangential groove wedge structure due to the different fixing methods of the permanent magnet and the pole piece.
  • Permanent magnet materials especially in rare earth cobalt permanent magnet materials, have low tensile strength. If there is no protective measure on the rotor, when the rotor diameter of the generator is large or high speed, the centrifugal force on the surface of the rotor will cause damage to the permanent magnet. Therefore, a ring is generally added to the outer surface of the synchronous generator rotor that is running at a high speed, and the permanent magnet and the soft iron pole piece are fixed in the corresponding positions by the collar.
  • the magnetic flux path of the tangential collar rotor magnetic circuit structure is: permanent magnet N pole one soft iron pole piece set of ring magnetic material section a soft iron pole piece a permanent magnet S pole. It can be seen from the magnetic flux path that a part of the collar is a component of the main magnetic circuit, and the magnetic permeability is required, and the other part of the collar is the interval between the two magnetic poles, and the magnetic separation is required. Therefore, the collar is composed of a high-precision, high-resistivity magnetic metal material and a non-magnetic material. The path between the permanent magnet and the soft iron pole shoe and the inner wall of the collar is the path of the main magnetic flux, and the parts must be processed with high precision.
  • the permanent magnet In the tangential groove wedge structure, the permanent magnet is fixed by the slot wedge, and the process and structure are relatively simple.
  • Some generators divide the rotor into several sections along the axial direction, and each section is a disk. When assembling, each disk is separately performed. Assemble, then put all the disks on the reels.
  • the magnetization direction of the permanent magnet in the radial rotor magnetic circuit structure is consistent with the air gap flux axis and close to the air gap, and the magnetic flux leakage coefficient is smaller than the tangential structure.
  • the radial magnetization structure and the rare earth permanent magnet work in the roadblock state, only The area of a permanent magnet provides the flux flux at each pole of the generator. Therefore, the air gap magnetic density is relatively low.
  • the shape of the permanent magnet in the radial rotor magnetic circuit structure mainly includes four types: a ring shape, a star shape, a tile type and a rectangle shape.
  • the magnetization direction length of the permanent magnet can be small, and tile-shaped permanent magnets and rectangular permanent magnets are often used. Rectangular hydromagnets have low processing costs and magnetization, and the magnetic properties of the same are best.
  • Tile-shaped ice magnets can also be composed of rectangular permanent magnet strips to reduce permanent magnet processing costs. Adjusting the width of the tile-shaped permanent magnet and the shape and width of the rectangular permanent magnet pole piece, that is, adjusting the pole piece coefficient, can improve the air gap magnetic field waveform.
  • the hybrid rotor magnetic circuit structure places permanent magnets in both radial and tangential directions, which can provide higher air gap magnetic density at a certain rotor diameter, or can reduce the rotor volume under the same air gap magnetic density. . In the case where the radial permanent magnets of the tangential permanent magnets have the same size, the amount of permanent magnets is reduced.
  • the hybrid rotor has a complicated structure, requires high processing precision for the rotor groove type and the permanent magnet, and is time-consuming to manufacture.
  • the representative structure of the axial rotor is a claw pole rotor, which has the advantages of simple shape of the permanent magnet, good magnetic performance, uniform magnetization and high utilization rate.
  • the disadvantage is that the claw pole structure is complicated, the manufacturing is difficult, the time-consuming, the large capacity unit, the claw Extremely subject to centrifugal force, special tightening measures are required.
  • the ratio of the claw pole and the flange to the rotor volume is large, and the motor quality is increased. It is not suitable to be a power frequency generator.
  • the pulsation loss in the claw pole is large and the efficiency is lowered.
  • the object of the present invention is to provide a permanent magnet direct drive wind power generator magnetic steel with simple structure, good processability and low cost in order to overcome the defects of the prior art described above.
  • the object of the present invention can be achieved by the following technical solutions: Designing a magnetic steel for a permanent magnet direct-drive wind power generator, characterized in that the magnetic steel has a rectangular cross section, a through hole in the center thereof, and an upper surface thereof Arched, the lower surface is arched, and the sides include the upper side, the middle side, and the lower side.
  • the through hole includes an upper portion and a lower portion, wherein the upper portion is a rounded table body and the lower portion is a cylindrical body.
  • the upper surface has the same diameter as the arcuate arc of the lower surface. 1
  • the upper side is rectangular.
  • the middle side is arched.
  • the lower side is rectangular.
  • the surface of the magnetic steel is galvanized.
  • the permanent magnet material type is sintered NdFeB 42SH; remanence (Br) 1.23 ⁇ 1.29 T ; maximum magnetic energy product (BH) max ⁇ 36MGOe ; intrinsic coercivity (Hcj) ⁇ 19kOe; intrinsic coercivity ( Hcj) temperature coefficient > -0.55 % / ° ((201 ⁇ 150); bulk magnet bonding performance under room temperature conditions > 10 3, shear strength > 120 MPa at 120 ° C, bonding layer insulation > 500 ⁇ ⁇ .
  • FIG. 1 is a schematic structural view of the present invention
  • Figure 2 is a cross-sectional view taken along line B-B of Figure 1 of the present invention.
  • a magnetic steel for a permanent magnet direct-drive wind power generator has a rectangular cross section, a through hole is arranged in the center, and an upper surface 2 is arched, and the lower surface 7 is In the shape of an arch, the side surface includes an upper side 6, a middle side 4, and a lower side 3.
  • the through hole includes an upper portion 1 and a lower portion 5, wherein the upper portion 1 is a rounded table body and the lower portion 5 is a cylindrical body.
  • the upper surface 2 and the arcuate arc of the lower surface 7 have the same diameter.
  • the upper side 6 is rectangular.
  • the middle side 4 is arched.
  • the lower side 3 is rectangular.
  • Correction page (Article 91) At the center of the magnetic steel, there is a through hole which can be fixed by a countersunk head screw, and the upper side and the lower side are regarded as a rectangular shape, and the bottom surface has a circular arc shape with the same radius as the outer circumference of the rotor, and the surface of the magnetic steel is galvanized.
  • Permanent magnet material type sintered NdFeB 42SH,
  • a new method of fixing the magnetic steel on the outer surface of the inner rotor of the present invention is to use a fixing screw, an anaerobic adhesive, an insulating sheet bead and a high-density glass fiber cloth and an epoxy resin to surround the composite fixing method of closing the outer surface of the entire rotor.
  • the magnet of the present invention is a permanent magnet direct drive generator specifically for wind power generation, it must be noted that it must be used for a direct drive type motor. Since the direct drive motor is a low speed motor, its maximum speed is not allowed to exceed 30 rpm.
  • the center of the magnetic steel has a through hole for wearing a fixing screw, and the surface is galvanized.
  • the barrier between the magnets is an insulating plate.
  • the outer surface of the entire rotor is closed with a 0.1 mm thick high-density glass fiber cloth and epoxy resin.
  • This high-density glass ff cloth and epoxy resin have a strong mechanical strength around the sealing layer.
  • Correction page (Article 91) It can effectively prevent the NdFeB magnet from falling off and oxidizing.
  • the invention has double layer fastening and good oxidation prevention of neodymium iron boron magnetic steel.
  • the innovation of the present invention is due to the use of the magnetic steel, and the magnetic steel that can be used in the permanent magnet wind power generator has a new hybrid fixing method. _
  • the permanent magnet motor's high quality permanent magnet material such as NdFeB permanent magnet material
  • NdFeB permanent magnet material is a mixture of metallic iron, rare earth lanthanum and 'non-metallic boron.
  • the production of magnetic steel is to first make various alloy thin plates, and then crush various materials and then make a mixture according to the design ratio, and then press it into the shape and size of the design to make 3 ⁇ 4.
  • the permanent magnet used in the permanent magnet motor is subjected to high-temperature sintering and heat treatment after press molding, and finally subjected to surface treatment. Due to the permanent magnet preparation process, the tensile strength of the permanent magnet cannot be made very high.
  • the magnetic steel of the present invention is a permanent magnet direct-drive generator specifically for wind power generation, it must be noted that it must be used for a direct drive type motor. Since the direct drive motor is a low speed motor, its maximum speed is not allowed to exceed 30 rpm. After careful analysis, the centrifugal force of the magnet on the inner rotor of the permanent magnet direct-drive wind turbine is only a few thousandth of that of a conventional motor. '
  • the rated speed of the 6-stage motor with the same diameter and the same magnetic steel is 1000 rpm
  • the rated speed of our 1.5MW permanent magnet motor is only 20 rpm
  • the rated speed of our 1.5MW permanent magnet motor is The centrifugal force is only 1/2500 of the centrifugal force of the 6-stage motor with the same mass and the same diameter.
  • the 1.5MW motor magnet of our company is much less centrifugal force!
  • the magnetic steel has a rectangular shape and a through hole at the center for wearing a fixing screw.
  • the magnetic shape is simple and easy to manufacture.
  • the 1.5MW permanent magnet direct-drive wind power generator of the invention adopts the simple design structure and good processability, and the cost is reduced by about 10? ⁇ compared with the conventional method, and good effects are obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Wind Motors (AREA)

Abstract

A magnetic steel for a permanent- magnet direct-driven wind mill generator is provided. The cross section of the magnetic steel is a rectangle in the center of which a through hole is provided. The upper surface (2) and the lower surface (7) of the magnetic steel are arches. The lateral surface of the magnetic steel includes an upper lateral surface (6), a middle lateral surface (4) and a lower lateral surface (3). The magnetic steel has the advantages of being fixed well and a low cost.

Description

一种永磁直驱风力发电机磁钢  Permanent magnet direct drive wind turbine magnet
[技术领域] 本发明涉及一种发电机的磁钢, 尤其是涉及一种用于永磁直驱风力发电机 的磁钢。 [Technical Field] The present invention relates to a magnetic steel for a generator, and more particularly to a magnetic steel for a permanent magnet direct drive wind power generator.
[背景技术] [Background technique]
永磁同步发电机从结构上可分外转子和内转子两种, 我们知道气隙、 直径 和电机容量的关系。 很显然同一气隙和直径的电机, 外转子结构和内转子结构 相比, 在电气性能是没有区别的。  The permanent magnet synchronous generator can be divided into two types: outer rotor and inner rotor. We know the relationship between air gap, diameter and motor capacity. It is clear that the electrical performance of the same air gap and diameter of the motor, the outer rotor structure and the inner rotor structure is indistinguishable.
内转子方式的永磁电机的磁钢是固定在转子外侧或外表面, 如果内转子的 永磁电机的永磁体是在内转子的外表面固定的, 则一般采用在永磁体外面加一 个压环用来保护磁体。 另外一种方法则是将磁体紧固在特殊加工的转子上的燕 尾槽内, 用槽楔方式固定。 但不论用何种方式固定, 其加工要求都很高、 很严 格。 这样就造成加工难度大, 成本高。  The magnet of the permanent magnet motor of the inner rotor type is fixed on the outer side or the outer surface of the rotor. If the permanent magnet of the permanent magnet motor of the inner rotor is fixed on the outer surface of the inner rotor, a pressure ring is generally added outside the permanent magnet. Used to protect the magnet. Another method is to fasten the magnet to the dovetail groove on the specially machined rotor and secure it with a wedge. But no matter how it is fixed, its processing requirements are very high and strict. This makes processing difficult and costly.
但是由于内转子方式的永磁电机的磁钢是固定在转子外侧或外表面, 如果 电机转速较高, 则离心力会很大 (离心力?=111,0)2,10,为防止永磁体的磁体 被离心力破碎, 第一种方法是, 如果内转子的永磁电机的永磁体是在内转子的 外表面固定的, 则一般采用在永磁体外面加一个压环用来保护磁体。 另外一种 方法则是将磁体紧固在特殊加工的转子上的燕尾槽内, 用槽楔方式固定。 但不 论用何种方式固定, 其加工要求都很高、 很严格。 这样就造成加工难度大, 成 本高。  However, since the magnet of the permanent magnet motor of the inner rotor type is fixed to the outer side or the outer surface of the rotor, if the motor speed is high, the centrifugal force will be large (centrifugal force? = 1111, 0) 2, 10, which is a magnet for preventing permanent magnets. The first method is to use a pressure ring on the outer surface of the permanent magnet to protect the magnet if the permanent magnet of the permanent magnet motor of the inner rotor is fixed on the outer surface of the inner rotor. Another method is to fasten the magnet to the dovetail groove on the specially machined rotor and secure it with a wedge. However, regardless of the method used, the processing requirements are very high and strict. This makes processing difficult and costly.
内转子永磁同步发电机中可有四种形式的转子磁路, 分别为径向式、 切向 式、 轴向式和混合式, 在实际的应用中, 常以切向结构和径向磁化结构居多, 由于径向磁化结构因为磁极直接面对气隙, 具有小的漏磁系数, 且其磁轭为一 整块导磁体, 同时避免了轴向励磁时轴向尺寸过大的问题, 因此, 工艺实现容 易, 而且径向磁化结构中, 气隙磁感应强度接近永磁体的工作点磁感应强度, 虽然没有切向结构那么大的气隙磁密, 但也不会太低, 所以径向结构具有明显 的优越性, 也是大型风力发电机设计中应用较多的转子磁路结构。 There are four types of rotor magnetic circuits in the inner rotor permanent magnet synchronous generator, which are radial, tangential, axial and hybrid. In practical applications, the tangential structure and radial magnetization are often used. Most of the structure, because the radial magnetization structure has a small magnetic flux leakage coefficient because the magnetic pole directly faces the air gap, and its yoke is a whole piece of magnetizer, and avoids the problem of excessive axial size during axial excitation. , process realization capacity In the radial and magnetized structure, the magnetic induction of the air gap is close to the magnetic induction intensity of the working point of the permanent magnet. Although there is no air gap magnetic density as large as the tangential structure, it is not too low, so the radial structure has obvious superiority. Sex, it is also a rotor magnetic circuit structure that is widely used in the design of large-scale wind turbines.
在切向磁化结构中, 永磁体的磁化方向与气隙磁通轴线接近垂直且离气隙 较远, 其漏磁比径向式结构要大, 在切向磁化结构中, 永磁体呈并联状态, 由 两块稀土永磁体提供发电机的每极磁通, 可提高气隙磁密, 尤其在极数多的情 况更为突出。  In the tangential magnetization structure, the magnetization direction of the permanent magnet is nearly perpendicular to the air gap flux axis and far from the air gap, and the magnetic flux leakage is larger than the radial structure. In the tangential magnetization structure, the permanent magnets are in parallel state. The magnetic flux per pole of the generator is provided by two rare earth permanent magnets, which can improve the air gap magnetic density, especially in the case of a large number of poles.
切向式转子磁路结构由于永磁体和极靴的固定方式不同, 通常可分为切向 套环式结构和切向槽楔式结构。 永磁材料, 尤其在稀土钴永磁材料的抗拉强度 很低, 如果转子上无防护措施, 等发电机转子直径较大或高速运转时, 转子表 面所承受的离心力将使永磁体出现损坏, 所以一般在高速运转的同步发电机转 子外表加一个套环, 通过套环把永磁体和软铁极靴都固定在相应的位置。  The tangential rotor magnetic circuit structure can be divided into a tangential collar structure and a tangential groove wedge structure due to the different fixing methods of the permanent magnet and the pole piece. Permanent magnet materials, especially in rare earth cobalt permanent magnet materials, have low tensile strength. If there is no protective measure on the rotor, when the rotor diameter of the generator is large or high speed, the centrifugal force on the surface of the rotor will cause damage to the permanent magnet. Therefore, a ring is generally added to the outer surface of the synchronous generator rotor that is running at a high speed, and the permanent magnet and the soft iron pole piece are fixed in the corresponding positions by the collar.
切向套环式转子磁路结构的磁通路径为: 永磁体 N极一软铁极靴一套环的 磁性材料段一软铁极靴一永磁体 S极。 从磁通路径可以看出, 套环的一部分是 主磁路的组成部分, 要求导磁性好, 而套环的另一部分是两磁极的间隔, 需要 隔磁。 因此套环是由高精度、 高电阻率的磁性金属材料和非磁材料构成。 而永 磁体和软铁极靴和套环内壁之间是主磁通的路径, 零件必须进行高精度加工。  The magnetic flux path of the tangential collar rotor magnetic circuit structure is: permanent magnet N pole one soft iron pole piece set of ring magnetic material section a soft iron pole piece a permanent magnet S pole. It can be seen from the magnetic flux path that a part of the collar is a component of the main magnetic circuit, and the magnetic permeability is required, and the other part of the collar is the interval between the two magnetic poles, and the magnetic separation is required. Therefore, the collar is composed of a high-precision, high-resistivity magnetic metal material and a non-magnetic material. The path between the permanent magnet and the soft iron pole shoe and the inner wall of the collar is the path of the main magnetic flux, and the parts must be processed with high precision.
切向槽楔式结构中永磁体用槽楔固定, 工艺和结构比较简单, 有的发电机 将转子沿轴向分为几段, 每段为一个磁盘, 装配时, 先将每一磁盘分别进行组 装, 再将所有磁盘套装在转轴上。  In the tangential groove wedge structure, the permanent magnet is fixed by the slot wedge, and the process and structure are relatively simple. Some generators divide the rotor into several sections along the axial direction, and each section is a disk. When assembling, each disk is separately performed. Assemble, then put all the disks on the reels.
径向式转子磁路结构中永久磁体磁化方向与气隙磁通轴线一致且离气隙较 近, 漏磁系数较切向结构小, 径向磁化结构中和稀土永磁体工作于路障状态, 只有一块永磁体的面积提供发电机每极气隙磁通。 因此气隙磁密相对较低。 径 向式转子磁路结构中永磁体的形状主要有环形、 星形、 瓦片型和矩形四种。  The magnetization direction of the permanent magnet in the radial rotor magnetic circuit structure is consistent with the air gap flux axis and close to the air gap, and the magnetic flux leakage coefficient is smaller than the tangential structure. The radial magnetization structure and the rare earth permanent magnet work in the roadblock state, only The area of a permanent magnet provides the flux flux at each pole of the generator. Therefore, the air gap magnetic density is relatively low. The shape of the permanent magnet in the radial rotor magnetic circuit structure mainly includes four types: a ring shape, a star shape, a tile type and a rectangle shape.
为了尽可能地减小转子的直径, 提高气隙磁密, 同时考虑到稀土永磁的矫 顽力高, 永磁体磁化方向长度可以小, 现多采用瓦片形永磁体和矩形永磁体。 矩形水磁体的加工费低, 磁化均勾, 同样水磁材料的磁性能最好。 瓦片形氷磁 体也可以用矩形永磁体条组成, 以减小永磁体加工费用。 调节瓦片形永磁体的 宽度和矩形永磁体极靴的形状和宽度, 也就是调节极靴系数, 可以改善气隙磁 场波形。 In order to reduce the diameter of the rotor as much as possible, and to improve the air gap magnetic density, and considering the high coercive force of the rare earth permanent magnet, the magnetization direction length of the permanent magnet can be small, and tile-shaped permanent magnets and rectangular permanent magnets are often used. Rectangular hydromagnets have low processing costs and magnetization, and the magnetic properties of the same are best. Tile-shaped ice magnets can also be composed of rectangular permanent magnet strips to reduce permanent magnet processing costs. Adjusting the width of the tile-shaped permanent magnet and the shape and width of the rectangular permanent magnet pole piece, that is, adjusting the pole piece coefficient, can improve the air gap magnetic field waveform.
混合式转子磁路结构是在径向和切向都放置永磁体, 它可以在一定的转子 直径下提供更高的气隙磁密, 或者要可以在气隙磁密相同的情况下缩小转子体 积。 在切向永磁体的径向永磁体的尺寸相同的情况下, 减少永磁体用量。 混合 式转子结构复杂, 对转子槽型和永磁体的加工精度要求高, 制造费时。  The hybrid rotor magnetic circuit structure places permanent magnets in both radial and tangential directions, which can provide higher air gap magnetic density at a certain rotor diameter, or can reduce the rotor volume under the same air gap magnetic density. . In the case where the radial permanent magnets of the tangential permanent magnets have the same size, the amount of permanent magnets is reduced. The hybrid rotor has a complicated structure, requires high processing precision for the rotor groove type and the permanent magnet, and is time-consuming to manufacture.
轴向式转子的代表结构是爪极式转子, 其优点是永磁体形状简单, 磁性能 好, 磁化均匀, 利用率高, 缺点是爪极结构复杂, 制造困难、 费时, 容量大的 机组, 爪极受离心力大, 需采用专门紧固措施, 爪极和法兰盘所占转子体积的 比例较大, 电机质量增加, 不宜制成工频发电机, 爪极中脉动损耗较大, 效率 下降。  The representative structure of the axial rotor is a claw pole rotor, which has the advantages of simple shape of the permanent magnet, good magnetic performance, uniform magnetization and high utilization rate. The disadvantage is that the claw pole structure is complicated, the manufacturing is difficult, the time-consuming, the large capacity unit, the claw Extremely subject to centrifugal force, special tightening measures are required. The ratio of the claw pole and the flange to the rotor volume is large, and the motor quality is increased. It is not suitable to be a power frequency generator. The pulsation loss in the claw pole is large and the efficiency is lowered.
[发明内容] [Summary of the Invention]
本发明的目的就是为了克服上述现有技术存在的缺陷而提供一种结构简 单、 工艺性好、成本低的永磁直驱风力发电机磁钢。 本发明的目的可以通过以下技术方案来实现: 设计一种用于永磁直驱风力 发电机的磁钢, 其特征在于, 该磁钢横截面为长方形, 其中央设有通孔, 其上 表面为拱形, 下表面为拱形, 侧面包括上侧面、 中侧面、 下侧面。 所述的通孔包括上部分、 下部分, 其中上部分为倒圆台体, 下部分为圆柱 体。 所述的上表面与下表面的拱形的圆弧直径相同。 1 所述的上侧面为矩形。 所述的中侧面为拱形。 所述的下侧面为矩形。 所诉磁钢表面镀锌。 所述永磁材料型号为烧结钕铁硼 42SH ; 剩磁 (Br) 1.23〜1.29 T; 最大磁 能积(BH) max^36MGOe; 内禀矫顽力 (Hcj) ^ 19kOe; 内禀矫顽力 (Hcj)的温度 系数> -0.55 % / °( (201 〜150 ); 大块磁体粘接性能室温条件下剪切强 度>10 3, 120°C时剪切强度 >5Mpa, 粘接层绝缘 >500Μ Ω。 The object of the present invention is to provide a permanent magnet direct drive wind power generator magnetic steel with simple structure, good processability and low cost in order to overcome the defects of the prior art described above. The object of the present invention can be achieved by the following technical solutions: Designing a magnetic steel for a permanent magnet direct-drive wind power generator, characterized in that the magnetic steel has a rectangular cross section, a through hole in the center thereof, and an upper surface thereof Arched, the lower surface is arched, and the sides include the upper side, the middle side, and the lower side. The through hole includes an upper portion and a lower portion, wherein the upper portion is a rounded table body and the lower portion is a cylindrical body. The upper surface has the same diameter as the arcuate arc of the lower surface. 1 The upper side is rectangular. The middle side is arched. The lower side is rectangular. The surface of the magnetic steel is galvanized. The permanent magnet material type is sintered NdFeB 42SH; remanence (Br) 1.23~1.29 T ; maximum magnetic energy product (BH) max^36MGOe ; intrinsic coercivity (Hcj) ^ 19kOe; intrinsic coercivity ( Hcj) temperature coefficient > -0.55 % / ° ((201 ~ 150); bulk magnet bonding performance under room temperature conditions > 10 3, shear strength > 120 MPa at 120 ° C, bonding layer insulation > 500 Μ Ω.
[附图说明] 图 1为本发明的结构示意图; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of the present invention;
图 2为本发明的图 1的 B-B方向上剖视图。  Figure 2 is a cross-sectional view taken along line B-B of Figure 1 of the present invention.
[具体实施方式] 下面结合附图和具体实施例对本发明进行详细说明。 DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings and specific embodiments.
实施例  Example
如图 1、 图 2所示, 一种用于永磁直驱风力发电机的磁钢, 该磁钢横截面为 长方形, 其中央设有通孔, 其上表面 2为拱形, 下表面 7为拱形, 侧面包括上 侧面 6、 中侧面 4、 下侧面 3。 所述的通孔包括上部分 1、 下部分 5, 其中上部分 1为倒圆台体, 下部分 5为圆柱体。所述的上表面 2与下表面 7的拱形的圆弧直 径相同。 所述的上侧面 6为矩形。 所述的中侧面 4为拱形。 所述的下侧面 3为 矩形。  As shown in FIG. 1 and FIG. 2, a magnetic steel for a permanent magnet direct-drive wind power generator, the magnetic steel has a rectangular cross section, a through hole is arranged in the center, and an upper surface 2 is arched, and the lower surface 7 is In the shape of an arch, the side surface includes an upper side 6, a middle side 4, and a lower side 3. The through hole includes an upper portion 1 and a lower portion 5, wherein the upper portion 1 is a rounded table body and the lower portion 5 is a cylindrical body. The upper surface 2 and the arcuate arc of the lower surface 7 have the same diameter. The upper side 6 is rectangular. The middle side 4 is arched. The lower side 3 is rectangular.
4  4
更正页 (细则第 91条) 磁钢为中心处有一个可以用沉头螺钉固定的通孔, 且上视与下视为长方形, 底面有与转子外圆半径相同的弧度 侧面为圆弧形,磁钢表面镀锌。 Correction page (Article 91) At the center of the magnetic steel, there is a through hole which can be fixed by a countersunk head screw, and the upper side and the lower side are regarded as a rectangular shape, and the bottom surface has a circular arc shape with the same radius as the outer circumference of the rotor, and the surface of the magnetic steel is galvanized.
主要技术参数:  The main technical parameters:
永磁材料型号: 烧结钕铁硼 42SH,  Permanent magnet material type: sintered NdFeB 42SH,
(1)剩磁 (Br): 1.23〜1.29 T;  (1) Remanence (Br): 1.23~1.29 T;
(2)最大磁能积 (BH) max: ^36MGOe; (2) Maximum magnetic energy product (BH) max: ^36MGOe ;
(3)内禀矫顽力 (Hcj): ^ 19kOe; (3) Intrinsic coercivity (Hcj): ^ 19kOe ;
(4)内禀矫顽力 (Hcj)的温度系数: 优于 -0.55 %/°C(20°C〜150°C);  (4) Temperature coefficient of intrinsic coercivity (Hcj): better than -0.55 % / ° C (20 ° C ~ 150 ° C);
( 5)大块磁体粘接性能达到: 室温, 剪切强度〉 10MPa, 120 °C , 剪切强 度>5^&。 粘接层绝缘 >500Μ Ω。 本发明的内转子的外表面固定磁钢的新方法是用固定螺钉、 厌氧胶、 绝缘 板压条和高密度玻璃纤维布和环氧树脂胶环绕封闭整个转子的外表面的复合式 固定方法。  (5) Bonding properties of bulk magnets are: room temperature, shear strength > 10MPa, 120 °C, shear strength >5^&. Bonding layer insulation >500Μ Ω. A new method of fixing the magnetic steel on the outer surface of the inner rotor of the present invention is to use a fixing screw, an anaerobic adhesive, an insulating sheet bead and a high-density glass fiber cloth and an epoxy resin to surround the composite fixing method of closing the outer surface of the entire rotor.
由于本发明的磁体是专门用于风力发电的永磁直驱发电机, 请注意必须用 于直驱型电机。 因为直驱型电机是低速电机, 其最高转速也不允许超过 30转 / 分。  Since the magnet of the present invention is a permanent magnet direct drive generator specifically for wind power generation, it must be noted that it must be used for a direct drive type motor. Since the direct drive motor is a low speed motor, its maximum speed is not allowed to exceed 30 rpm.
磁钢的中心有一用来穿固定螺钉的通孔, 表面镀锌。 安装时先在要安装磁 钢的转子外壳表面涂上厌氧胶, 再将磁钢的通孔与安装孔对正, 然后每片磁钢 中心用 lCrl8Ni9Ti的不导磁的不锈钢沉头螺钉压紧定位。 在磁钢之间的隔离层 是绝缘板。  The center of the magnetic steel has a through hole for wearing a fixing screw, and the surface is galvanized. When installing, first coat the surface of the rotor shell to which the magnetic steel is to be mounted with anaerobic adhesive, and then align the through hole of the magnetic steel with the mounting hole, and then press the center of each magnetic steel with the non-magnetic stainless steel countersunk head screw of lCrl8Ni9Ti. Positioning. The barrier between the magnets is an insulating plate.
在所有的磁钢安装完毕后, 再以 0.1mm厚的高密度玻璃纤维布和环氧树脂 胶环绕封闭整个转子的外表面。  After all the magnetic steels have been installed, the outer surface of the entire rotor is closed with a 0.1 mm thick high-density glass fiber cloth and epoxy resin.
这种高密度玻璃 ff维布和环氧树脂胶环绕封闭层有很强的机械结构强度,  This high-density glass ff cloth and epoxy resin have a strong mechanical strength around the sealing layer.
5 5
更正页 (细则第 91条) 可有效防止钕铁硼磁钢脱落和氧化。 本发明具有了双层紧固和良好的防止钕铁 硼磁钢氧化作用。 Correction page (Article 91) It can effectively prevent the NdFeB magnet from falling off and oxidizing. The invention has double layer fastening and good oxidation prevention of neodymium iron boron magnetic steel.
本发明的创新处是由于本磁钢的使用, 可以使用于永磁风力发电机的磁钢 有了一种全新的复合式固定新方法。 _  The innovation of the present invention is due to the use of the magnetic steel, and the magnetic steel that can be used in the permanent magnet wind power generator has a new hybrid fixing method. _
因为永磁电机的高品质永磁材料如钕铁硼永磁材料, 是金属铁、 稀土钕及' 非金属硼的混合物。 其中磁钢制造是先制作各种合金薄板, 再将各种材料破碎 后按设计比例制成混合物, 然 再按设计形状和尺寸压制成 ¾。 永磁电机使用 的永磁体压制成型后还需进行高温烧结和热处理, 最后再进行表面处理。 由于 这种永磁体制备工艺的原因, 永磁体的抗拉伸强度是不可能做得很高的。  Because the permanent magnet motor's high quality permanent magnet material, such as NdFeB permanent magnet material, is a mixture of metallic iron, rare earth lanthanum and 'non-metallic boron. Among them, the production of magnetic steel is to first make various alloy thin plates, and then crush various materials and then make a mixture according to the design ratio, and then press it into the shape and size of the design to make 3⁄4. The permanent magnet used in the permanent magnet motor is subjected to high-temperature sintering and heat treatment after press molding, and finally subjected to surface treatment. Due to the permanent magnet preparation process, the tensile strength of the permanent magnet cannot be made very high.
但是由于常规内转子方式的永磁电机的磁钢是固定在转子外侧或外表面, 如果电机转速较高, 则离心力会很大 (离心力 F =πι · ω2 · R) ,通常发电机磁 体为避免应力集中, 不使磁体在离心力作用下碎裂, 因而磁体上禁止有孔洞。  However, since the magnet of the permanent magnet motor of the conventional inner rotor type is fixed on the outer side or the outer surface of the rotor, if the motor speed is high, the centrifugal force will be large (centrifugal force F = πι · ω2 · R), usually the generator magnet is avoided. The stress concentration does not cause the magnet to break under the centrifugal force, so holes are not allowed on the magnet.
由于本发明的磁钢是专门用于风力发电的永磁直驱发电机, 请注意必须用 于直驱型电机。 因为直驱型电机是低速电机, 其最高转速也不允许超过 30转 / 分。 我们经过认真分析研究, 永磁直驱风力发电机内转子上磁体所受离心力只 是常规电机的几千分之一。 '  Since the magnetic steel of the present invention is a permanent magnet direct-drive generator specifically for wind power generation, it must be noted that it must be used for a direct drive type motor. Since the direct drive motor is a low speed motor, its maximum speed is not allowed to exceed 30 rpm. After careful analysis, the centrifugal force of the magnet on the inner rotor of the permanent magnet direct-drive wind turbine is only a few thousandth of that of a conventional motor. '
例如直径相同,磁钢质量也相同的 6级电机的额定转速 1000转 /分,而我公 司 1.5MW永磁电机的额定转速仅为 20转 /分, 因此我公司 1.5MW永磁电机额 定转速时的离心力仅为磁体质量相同且直径也相同的 6级电机所受离心力的 1/2500 我公司 1.5MW电机磁体所受离心力要小得多!  For example, the rated speed of the 6-stage motor with the same diameter and the same magnetic steel is 1000 rpm, and the rated speed of our 1.5MW permanent magnet motor is only 20 rpm, so the rated speed of our 1.5MW permanent magnet motor is The centrifugal force is only 1/2500 of the centrifugal force of the 6-stage motor with the same mass and the same diameter. The 1.5MW motor magnet of our company is much less centrifugal force!
这样我们就可设计出一种不同于常规高速电机的内转子制作方法。 本发明 中, 磁钢外形为长方形, 中心有一用来穿固定螺钉的通孔。 磁刚形状简单, 制 作方便。  In this way, we can design an inner rotor manufacturing method different from conventional high speed motors. In the present invention, the magnetic steel has a rectangular shape and a through hole at the center for wearing a fixing screw. The magnetic shape is simple and easy to manufacture.
6  6
更正页 (细则第 91条) 本发明 1.5MW永磁直驱风力发电机采用本设计结构简单、 工艺性好, 成本 比传统方式降低 10?^左右, 取得良好效果。 Correction page (Article 91) The 1.5MW permanent magnet direct-drive wind power generator of the invention adopts the simple design structure and good processability, and the cost is reduced by about 10?^ compared with the conventional method, and good effects are obtained.

Claims

权 利 要 求 书 Claim
1. 一种永磁直驱风力发电机的磁钢, 其特征在于, 该磁钢横截面为长方形, 其 中央设有通孔, 其上表面为拱形, 下表面为拱形, 侧面包括上侧面、 中侧面、 下侧面。 A magnetic steel for a permanent magnet direct-drive wind power generator, characterized in that the magnetic steel has a rectangular cross section, a through hole is formed in the center thereof, an upper surface is arched, a lower surface is arched, and a side surface includes an upper surface Side, mid side, bottom side.
2. 根据权利要求 1所述的一种永磁直驱风力发电机的磁钢, 其特征在于, 所述 的通孔包括上部分、 下部分, 其中上部分为倒圆台体, 下部分为圆柱体。 2 . The magnetic steel of a permanent magnet direct drive wind power generator according to claim 1 , wherein the through hole comprises an upper portion and a lower portion, wherein the upper portion is a rounded platform and the lower portion is a cylinder. body.
3. 根据权利要求 1所述的一种永磁直驱风力发电机的磁钢, 其特征在于, 所述 的上表面与下表面的拱形的圆弧直径相同。 3. The magnetic steel of a permanent magnet direct drive wind power generator according to claim 1, wherein the upper surface and the arcuate arc of the lower surface have the same diameter.
4. 根据权利要求 1所述的一种永磁直驱风力发电机輔興鋼, 其特征在于, 所述 的上侧面为矩形。 4. A permanent magnet direct-drive wind turbine auxiliary machine according to claim 1, wherein said upper side is rectangular.
5. 根据权利要求 1所述的一种永磁!:顯灣 靈电机的磁钢, 其特征在于, 所述 的中侧面为拱形。 5. A permanent magnet according to claim 1! The magnetic steel of the display bay spirit motor is characterized in that the middle side is arched.
的下侧面为矩形。 The lower side is rectangular.
7. 根据权利褒求 ί ί 的一种永磁直驱风力发电机的磁钢, 其特征在于, 该磁 钢表面镀 7. A magnetic steel for a permanent magnet direct drive wind power generator according to claim ίίί, characterized in that the surface of the magnetic steel is plated
8. 根据权利要求 1所述的一种永磁直驱风力发电机的磁钢, 其特征在于, 永磁 材料型号为烧结钕铁硼 42SH ; 剩磁 (Br) 1.23〜1.29 T; 最大磁能积(BH ) max^36MGOe; 内禀矫顽力(Hcj) 19kOe; 内禀矫顽力(Hcj)的温度系数 > -0.55 %/°C (20° (:〜 150°C); 大块磁体粘接性能室温条件下剪切强度〉 10MPa, 120°C时剪切强度〉 5Mpa, 粘接层绝缘〉 500Μ Ω。 8. The magnetic steel of a permanent magnet direct drive wind power generator according to claim 1, wherein the permanent magnet material type is sintered neodymium iron boron 42SH; residual magnetism (Br) 1.23~1.29 T; maximum magnetic energy product (BH) max^36MGOe ; intrinsic coercivity (Hcj) 19kOe; temperature coefficient of intrinsic coercivity (Hcj) > -0.55 %/°C (20° (:~ 150°C); bulk magnet sticking The shear strength is >10 MPa at room temperature, the shear strength is >5 Mpa at 120 °C, and the insulation of the bonding layer is >500 Ω.
PCT/CN2010/078361 2010-07-26 2010-11-03 Magnetic steel for permanent-magnet direct-driven wind mill generator WO2012012978A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010236311XA CN102340188A (en) 2010-07-26 2010-07-26 Magnetic steel used for permanent-magnet direct drive wind power generator
CN201010236311.X 2010-07-26

Publications (1)

Publication Number Publication Date
WO2012012978A1 true WO2012012978A1 (en) 2012-02-02

Family

ID=45515755

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2010/078361 WO2012012978A1 (en) 2010-07-26 2010-11-03 Magnetic steel for permanent-magnet direct-driven wind mill generator

Country Status (2)

Country Link
CN (1) CN102340188A (en)
WO (1) WO2012012978A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108718125A (en) * 2018-07-18 2018-10-30 江苏中车电机有限公司 A kind of direct-drive permanent magnet wind power generator magnetic pole box installation and guide device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2840480Y (en) * 2005-10-11 2006-11-22 上海万德风力发电股份有限公司 Neodymium-ferroboron permanent magnetic electric machine rotor used on wind power generator
CN101640442A (en) * 2009-07-20 2010-02-03 陆美娟 Permanent magnet generator rotor
CN101728882A (en) * 2008-10-17 2010-06-09 河南森源电气股份有限公司 Permanent magnet generator rotor
CN201774325U (en) * 2010-07-26 2011-03-23 上海万德风力发电股份有限公司 Magnetic steel for 1.5MW permanent magnet direct drive wind driven generator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86105540A (en) * 1986-07-24 1988-02-17 冶金工业部包头稀土研究院 The antirust technology of rare-earth permanent magnet
DE102004045939B4 (en) * 2004-09-22 2010-10-07 Siemens Ag Permanent magnet synchronous machine with suppressing means for improving torque ripple
JP4477072B2 (en) * 2008-02-13 2010-06-09 三菱電機株式会社 Rotating electric machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2840480Y (en) * 2005-10-11 2006-11-22 上海万德风力发电股份有限公司 Neodymium-ferroboron permanent magnetic electric machine rotor used on wind power generator
CN101728882A (en) * 2008-10-17 2010-06-09 河南森源电气股份有限公司 Permanent magnet generator rotor
CN101640442A (en) * 2009-07-20 2010-02-03 陆美娟 Permanent magnet generator rotor
CN201774325U (en) * 2010-07-26 2011-03-23 上海万德风力发电股份有限公司 Magnetic steel for 1.5MW permanent magnet direct drive wind driven generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108718125A (en) * 2018-07-18 2018-10-30 江苏中车电机有限公司 A kind of direct-drive permanent magnet wind power generator magnetic pole box installation and guide device

Also Published As

Publication number Publication date
CN102340188A (en) 2012-02-01

Similar Documents

Publication Publication Date Title
CN102201711B (en) Rotor and permanent magnet type rotating electric machine
CN102684337B (en) Subsection skewed-pole type permanent magnet synchronous motor rotor
CN102005838B (en) High-power permanent-magnet motor rotor, installation method of rotor and method for magnetizing rotor permanent magnet
EP2169806B1 (en) Axial gap rotating electric machine
CN102545493B (en) Method for manufacturing rotor of permanent-magnet motor
US8860272B2 (en) Synchronous generator, especially for wind turbines
WO2013107127A1 (en) Segmented permanent-magnet synchronized motor rotor structure
CN110048575B (en) Composite structure permanent magnet rotor suitable for high-speed permanent magnet synchronous motor
CN105515229A (en) Disc type motor
CN202634111U (en) Subsection skewed-pole type permanent magnet synchronous motor rotor
CN110022043A (en) A kind of virtual pole spoke type permanent magnet synchronous motor of integer slot Distributed Winding and its low pulse design method
CN111654130A (en) Composite rotor structure of energy storage flywheel high-speed permanent magnet synchronous motor
WO2017177740A1 (en) Permanent magnet motor
CN102545434B (en) Radial rotor structure for permanent magnet synchronous motor
CN107565779B (en) A kind of high-precision double-round magnet steel brshless DC motor
CN111509883A (en) Rotor assembly and axial magnetic field motor
CN102647055A (en) Assembly method of large-power permanent magnetic motor rotor
WO2012012978A1 (en) Magnetic steel for permanent-magnet direct-driven wind mill generator
CN107425628A (en) A kind of magneto magnet and production method for reducing eddy-current heating
CN206332513U (en) A kind of modular Thee-phase alternating current permanent-magnetic frequency control motor
CN201541158U (en) 1.5MW permanent-magnet direct-drive wind power generator inner rotor
CN202634110U (en) Radial type PMSM rotor structure
WO2011060685A1 (en) Manufacturing method of inner rotor for large-sized permanent magnet direct-driving wind mill generator
CN106849547A (en) Threephase asynchronous efficient rare-earth permanent magnetism reproducing method
CN206004431U (en) A kind of non-uniform gap durface mounted permanent magnet synchronous motor structure

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10855205

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10855205

Country of ref document: EP

Kind code of ref document: A1