CN1645719A - Permanent magnet electric motor with double rotor - Google Patents
Permanent magnet electric motor with double rotor Download PDFInfo
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- CN1645719A CN1645719A CN 200410075764 CN200410075764A CN1645719A CN 1645719 A CN1645719 A CN 1645719A CN 200410075764 CN200410075764 CN 200410075764 CN 200410075764 A CN200410075764 A CN 200410075764A CN 1645719 A CN1645719 A CN 1645719A
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- 238000004804 winding Methods 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims 2
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 9
- 230000004907 flux Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 abstract description 2
- 230000005415 magnetization Effects 0.000 description 7
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
本发明公开一种双转子永磁电机，采用铁氧体永磁因此具有很低的制造成本；采用特殊的内外转子磁体结构，双转子共用一个定子，定子铁心为圆柱形结构，能有效提高内、外转子铁氧体磁体所产生的内、外气隙永磁磁密，并使气隙磁密成正弦分布，同时大大降低内、外转子轭部导磁铁心厚度。本发明的双转子永磁电机，不但具有很低的成本而且具有很高的运行效率和转矩密度。2.2kW双转子铁氧体双转子永磁电机样机具有1Nm/kg的转矩密度、87％的运行效率，远高于价格昂贵的钕铁硼永磁电机0.5Nm/kg的转矩密度和86％的运行效率。
The invention discloses a double-rotor permanent magnet motor, which adopts ferrite permanent magnets and thus has very low manufacturing cost; adopts a special inner and outer rotor magnet structure, and the double rotors share a stator, and the stator core is a cylindrical structure, which can effectively improve the inner and outer rotors. 1. The inner and outer air gap permanent magnetic flux density produced by the ferrite magnet of the outer rotor makes the air gap flux density into a sinusoidal distribution, and at the same time greatly reduces the thickness of the inner and outer rotor yoke cores. The dual-rotor permanent magnet motor of the present invention not only has very low cost but also has high operating efficiency and torque density. The 2.2kW double-rotor ferrite double-rotor permanent magnet motor prototype has a torque density of 1Nm/kg and an operating efficiency of 87%, which is much higher than the expensive NdFeB permanent magnet motor with a torque density of 0.5Nm/kg and 86% % operating efficiency.
Description
(一)技术领域(1) Technical field
本发明属于永磁电机，特别是涉及铁氧体永磁电机技术。The invention belongs to permanent magnet motors, in particular to the technology of ferrite permanent magnet motors.
(二)背景技术(2) Background technology
高运行效率和高转矩密度是电机的基本性能要求，稀土永磁电机由于采用高性能的稀土磁体而很容易满足这一要求，但价格昂贵的稀土磁体的采用大大提高了电机的制造成本；铁氧体永磁电机因所用磁体材料廉价而具有很低的制造成本，但磁体磁性能低，而使电机具有较低的运行效率和很低的转矩密度。因此永磁电机由于价格和性能的矛盾难以广泛普及应用。High operating efficiency and high torque density are the basic performance requirements of motors. Rare-earth permanent magnet motors can easily meet this requirement due to the use of high-performance rare-earth magnets, but the use of expensive rare-earth magnets greatly increases the manufacturing cost of the motor; Ferrite permanent magnet motors have very low manufacturing costs due to the low-cost magnet materials used, but the low magnetic properties of the magnets make the motors have low operating efficiency and low torque density. Therefore, it is difficult for permanent magnet motors to be widely used due to the contradiction between price and performance.
国外已公发的双转子径向磁场永磁电机是由一台外转子永磁电机和一台内转子永磁电机套在一起并共用一个定子的新型电机，它可以以价格低廉的铁氧体永磁代替稀土永磁，但仍具有较高的效率和转矩密度。该电机于2003年首次见诸文献并首先由美国人Thomas A Lipo等提出。这种电机的成本优势源于铁氧体永磁的采用，性能优势仅源于其结构的创新。但该电机内外转子磁体采用常规磁体结构，即电机内外转子磁体的块数都与电机的极数相等，每块磁体形成电机的一个磁极，因此该电机低气隙磁密的本质没有变化，限制了该种电机性能的进一步提高；同时，该电机采用常规磁体结构，所产生的气隙磁密波形为梯形波，因此相电势波形也是梯形波，并不适应于正弦交流电源供电。The double-rotor radial field permanent magnet motor that has been published abroad is a new type of motor that is set together by an outer rotor permanent magnet motor and an inner rotor permanent magnet motor and shares a stator. Permanent magnets replace rare earth permanent magnets, but still have higher efficiency and torque density. The motor first appeared in literature in 2003 and was first proposed by American Thomas A Lipo et al. The cost advantage of this motor comes from the use of ferrite permanent magnets, and the performance advantage comes only from the innovation of its structure. However, the magnets of the inner and outer rotors of the motor adopt a conventional magnet structure, that is, the number of magnets in the inner and outer rotors of the motor is equal to the number of poles of the motor, and each magnet forms a magnetic pole of the motor. At the same time, the motor adopts a conventional magnet structure, and the generated air-gap flux density waveform is a trapezoidal wave, so the phase potential waveform is also a trapezoidal wave, which is not suitable for sinusoidal AC power supply.
(三)发明内容(3) Contents of the invention
本发明为解决上述问题，提供一种新型双转子永磁电机。In order to solve the above problems, the present invention provides a novel double-rotor permanent magnet motor.
本发明是在上述双转子永磁电机的基础上，通过采用新型磁体结构，有效提高内、外转子的气隙磁密，降低内外转子轭部磁密从而可以减小甚至省去内外转子导磁铁心轭，因而进一步提高双转子铁氧体永磁电机的运行效率和转矩密度；同时通过采用这一新型磁体结构，可以有效保证内、外转子气隙磁密波形的正弦性，从而保证电机相电势波形的正弦性。The present invention is based on the above-mentioned double-rotor permanent magnet motor, by adopting a novel magnet structure, the air-gap magnetic density of the inner and outer rotors is effectively improved, and the magnetic density of the yoke of the inner and outer rotors is reduced, so that the inner and outer rotors can be reduced or even eliminated. core yoke, thereby further improving the operating efficiency and torque density of the double-rotor ferrite permanent magnet motor; at the same time, by adopting this new magnet structure, it can effectively ensure the sinusoidality of the inner and outer rotor air gap flux density waveforms, thereby ensuring the motor The sinusoidal nature of the phase potential waveform.
本双转子永磁电机由内外永磁转子和双转子之间的定子组成，外转子与定子之间形成电机的外气隙，内转子与定子之间形成电机的内气隙，内外转子在端部固定在一起并同步旋转。The double-rotor permanent magnet motor is composed of inner and outer permanent magnet rotors and a stator between the double rotors. The outer air gap of the motor is formed between the outer rotor and the stator, and the inner air gap of the motor is formed between the inner rotor and the stator. The inner and outer rotors are at the ends. The parts are fixed together and rotate synchronously.
外转子由外转子导磁铁心轭及紧贴其内的永磁体组成，外转子每极磁体由两块或两块以上具有一定充磁规律的磁体块组成。该种磁体结构与常规外转子磁体结构相比，提高了电机气隙磁密，降低了外转子导磁铁心轭中的磁密。The outer rotor is composed of the outer rotor magnet core yoke and the permanent magnet close to it, and each pole magnet of the outer rotor is composed of two or more magnet blocks with certain magnetization rules. Compared with the conventional outer rotor magnet structure, this kind of magnet structure improves the air gap magnetic density of the motor, and reduces the magnetic density in the outer rotor magnetic core yoke.
内转子由内转子导磁铁心轭及紧贴其外的永磁体组成，内转子每极磁体同样由两块或两块以上的具有一定充磁规律的磁体块组成，该磁体结构可以提高电机内气隙的气隙磁密，降低内转子导磁铁心轭中的磁密。The inner rotor is composed of the inner rotor magnetic core yoke and the permanent magnet close to it. Each pole magnet of the inner rotor is also composed of two or more magnet blocks with certain magnetization rules. This magnet structure can improve the motor internal The air-gap magnetic density of the air gap reduces the magnetic density in the inner rotor permeable core yoke.
电机的内外转子共用一个定子，这一定子沿轴向固定在一垂直静止的端盖上。定子由定子铁心和定子绕组组成。定子铁心为圆柱形结构，在其内外表面分别开有均匀分布的齿槽以放置定子绕组。定子绕组每一个线圈的两个有效边分别位于内外定子槽中，这两个槽的中心线一般位于同一半径方向上，也可以有所错位。电机的内外气隙磁场都以定子铁心轭作为其闭合磁路的一部分，并在定子铁心轭中具有相同的方向。因此在定子绕组每一个线圈中，位于定子外槽中的有效边与外气隙磁体相互作用，位于定子内槽中的有效边与外气隙磁场相互作用。The inner and outer rotors of the motor share a stator, which is axially fixed on a vertically stationary end cover. The stator consists of a stator core and a stator winding. The stator core is a cylindrical structure, and its inner and outer surfaces are respectively provided with evenly distributed tooth slots to place the stator winding. The two effective sides of each coil of the stator winding are respectively located in the inner and outer stator slots, and the centerlines of these two slots are generally located in the same radial direction, and may also be misaligned. Both the inner and outer air gap magnetic fields of the motor have the stator yoke as part of their closed magnetic circuit and have the same direction in the stator yoke. Therefore, in each coil of the stator winding, the effective side located in the outer slot of the stator interacts with the outer air gap magnet, and the effective side located in the inner slot of the stator interacts with the outer air gap magnetic field.
电机的转矩密度与电机气隙表面积、气隙磁密值成正比，本发明的双转子永磁电机，不但具有内外两个气隙增大了气隙表面积，而且由于内外转子磁体都采用特殊的磁体结构而增大了内外转子气隙磁密，因此增大了电机的转矩密度；同时本发明所采用的特殊磁体结构，可以使内外转子轭部磁密降低很多，大大减少甚至省去内外转子导磁铁心轭，极大地降低电机的体积和重量，从而更加提高电机的转矩密度。双转子电机特殊的定子线圈结构能有效提高电机铜线利用率，降低绕组电阻，同时所采用的特殊磁体结构有效地提高了磁负荷，从而降低了电负荷，因此可以有效降低电机的铜耗，提高电机的运行效率。The torque density of the motor is directly proportional to the surface area of the motor air gap and the magnetic density value of the air gap. The double-rotor permanent magnet motor of the present invention not only has two air gaps inside and outside to increase the surface area of the air gap, but also because the inner and outer rotor magnets are made of special The magnetic structure of the inner and outer rotors increases the air-gap magnetic density of the inner and outer rotors, thereby increasing the torque density of the motor; at the same time, the special magnet structure adopted in the present invention can greatly reduce the magnetic density of the inner and outer rotor yokes, greatly reducing or even eliminating The inner and outer rotors conduct magnet core yoke, which greatly reduces the volume and weight of the motor, thereby further improving the torque density of the motor. The special stator coil structure of the dual-rotor motor can effectively improve the utilization rate of the copper wire of the motor and reduce the winding resistance. At the same time, the special magnet structure adopted can effectively increase the magnetic load, thereby reducing the electric load, so it can effectively reduce the copper consumption of the motor. Improve the operating efficiency of the motor.
本发明的双转子永磁电机采用特殊的内外转子磁体结构，不但使内、外转子气隙磁密提高、使内外转子轭部磁密降低，从而提高电机的运行效率和转矩密度，而且使内外转子气隙磁密呈正弦分布，能够保证绕组电势呈正弦分布。The double-rotor permanent magnet motor of the present invention adopts a special inner and outer rotor magnet structure, which not only increases the air gap magnetic density of the inner and outer rotors, but also reduces the magnetic density of the yoke of the inner and outer rotors, thereby improving the operating efficiency and torque density of the motor, and making The air gap flux density of the inner and outer rotors is sinusoidally distributed, which can ensure that the winding potential is sinusoidally distributed.
(四)附图说明(4) Description of drawings
图1为双转子永磁电机的横截面图。Figure 1 is a cross-sectional view of a dual-rotor permanent magnet motor.
图2为双转子永磁电机的轴截面图：由外转子导磁铁心轭1、外转子磁体2组成外转子，由转轴8、内转子导磁铁心轭7及内转子磁体6组成内转子。内、外转子通过端部园盘9固连在一起并由轴承11、12支撑在静止座13和垂直静止端盖10上。定子4固定在垂直静止端盖10上。外转子与定子之间形成电机的外气隙3，内转子与定子之间形成电机的内气隙5。2 is a shaft cross-sectional view of a double-rotor permanent magnet motor: the outer rotor is composed of the outer rotor
图3为内、外转子磁体图：分别由多块相同结构尺寸、不同充磁方向的磁体块组成。其中θi表示某一磁体块的位置，箭头方向为该磁体块充磁方向，并用角度θm表示，θm＝(1±p)θi，当磁体块用作外磁体时取“+”，当磁体块用作内磁体时取“-”，p为电机的极对数。Figure 3 is a diagram of the inner and outer rotor magnets: they are composed of multiple magnet blocks with the same structural size and different magnetization directions. Where θ i represents the position of a certain magnet block, the direction of the arrow is the magnetization direction of the magnet block, and is represented by the angle θ m , θ m = (1±p)θ i , when the magnet block is used as an external magnet, take "+" , take "-" when the magnet block is used as the inner magnet, and p is the number of pole pairs of the motor.
图4、图5、图6、图7分别为4极双转子永磁电机每极2块磁体和3块磁体时内、外转子磁体的实例图：其中图4为4极双转子永磁电机每极2块磁体时的外转子磁体结构，图5为4极双转子永磁电机每极2块磁体时的内转子磁体结构，图6为4极双转子永磁电机每极3块磁体时外转子磁体结构，图7为4极双转子永磁电机每极3块磁体时内转子磁体结构，在图3、图4、图5、图6、图7中，箭头方向为磁体块的充磁方向。电机的极对数可以是任意整数，电机每极磁体块数可以是大于1的任意整数。Figure 4, Figure 5, Figure 6, and Figure 7 are examples of inner and outer rotor magnets for a 4-pole double-rotor permanent magnet motor with 2 magnets and 3 magnets per pole, respectively: Figure 4 is a 4-pole double-rotor permanent magnet motor The magnet structure of the outer rotor with 2 magnets per pole, Fig. 5 is the magnet structure of the inner rotor with 2 magnets per pole of the 4-pole dual-rotor permanent magnet motor, and Fig. 6 is the magnet structure of the 4-pole dual-rotor permanent magnet motor with 3 magnets per pole The magnet structure of the outer rotor, Fig. 7 is the magnet structure of the inner rotor when there are 3 magnets per pole of a 4-pole double-rotor permanent magnet motor. In Fig. 3, Fig. 4, Fig. 5, Fig. 6, and Fig. magnetic direction. The number of pole pairs of the motor can be any integer, and the number of magnet blocks per pole of the motor can be any integer greater than 1.
图8为每极4块磁体4极外转子磁体结构产生的磁场分布图，其中箭头方向为磁体充磁方向，各闭合曲线代表磁场磁力线。可以看出磁体外部磁场很弱，而内部磁场很强；因此磁体外部的导磁轭可以很薄甚至可以省去磁体外部导磁轭，同时具有很强的内部磁场。Fig. 8 is a magnetic field distribution diagram generated by the structure of 4 magnets per pole and 4 poles outer rotor magnets, where the direction of the arrow is the magnetization direction of the magnet, and each closed curve represents the magnetic force line of the magnetic field. It can be seen that the external magnetic field of the magnet is very weak, but the internal magnetic field is very strong; therefore, the external magnetic yoke of the magnet can be very thin or even the external magnetic yoke of the magnet can be omitted, while having a strong internal magnetic field.
图9为每极4块磁体4极内转子磁体结构产生的磁场分布图，其中箭头方向为磁体充磁方向，各闭合曲线代表磁力线。可以看出磁体内部磁场很弱，而外部磁场很强；因此磁体内部的导磁轭可以很薄甚至可以省去磁体内部导磁轭，同时具有很强的外部磁场。Fig. 9 is a diagram of the magnetic field distribution generated by the rotor magnet structure with 4 magnets per pole and 4 poles, where the direction of the arrow is the magnetization direction of the magnet, and each closed curve represents the magnetic force line. It can be seen that the internal magnetic field of the magnet is very weak, while the external magnetic field is very strong; therefore, the magnetic yoke inside the magnet can be very thin or even the internal magnetic yoke of the magnet can be omitted, while having a strong external magnetic field.
图10为双转子永磁电机的定子立体图，由定子铁心1和定子绕组2组成。FIG. 10 is a three-dimensional view of a stator of a double-rotor permanent magnet motor, which consists of a
图11为定子的轴截面图，其中1为定子铁心，2为定子绕组一个线圈的两个有效边。Figure 11 is an axial cross-sectional view of the stator, where 1 is the stator core, and 2 is the two effective sides of a coil of the stator winding.
(五)具体实施方案(5) Specific implementation plan
双转子永磁电机的实施由双转子实施、定子实施及双转子与定子的装配组成。双转子实施如图1-图10所示。圆桶型的内转子导磁铁心轭7套在转轴8上，圆桶型的外转子导磁铁心轭1通过端面园盘9固定连接在转轴8上，内外转子导磁铁心轭轴向长度相近并且大体正对；根据所要求的电机极数及每极磁体块数，制作组成外转子磁体2和内转子磁体6的磁体块，组成外转子磁体的各磁体块结构尺寸相同，组成内转子磁体的各磁体块结构尺寸也相同。对各磁体块按图3所示的磁体充磁方向进行充磁，然后将各磁体块按图3所示依次放置在外转子导磁铁心轭内表面上和内转子导磁铁心轭的外表面上，构成外转子磁体2和内转子磁体6。The implementation of the double-rotor permanent magnet motor is composed of the implementation of the double-rotor, the implementation of the stator and the assembly of the double-rotor and the stator. The dual rotor implementation is shown in Figures 1-10. The barrel-shaped inner rotor
定子实施如图11、图12所示。按图11所示冲制定子铁心冲片，按要求的轴向长度叠压铁心片形成电机的定子铁心，按图12所示的方式放置定子线圈，并按一定的规律将各线圈相互连接而组成定子绕组，这样形成双转子永磁电机的定子。The stator implementation is shown in Figure 11 and Figure 12. Punch the stator core sheet as shown in Figure 11, laminate the iron core sheets according to the required axial length to form the stator core of the motor, place the stator coils as shown in Figure 12, and connect the coils to each other according to certain rules The stator windings are formed, thus forming the stator of the dual-rotor permanent magnet motor.
双转子与定子的装配：将靠近端面园盘9的转轴轴端通过轴承11支撑在垂直静止座13上；将定子一端沿轴向固定在垂直静止端盖10上；转轴另一轴端通过轴承12支撑在垂直静止端盖10上。The assembly of the double rotor and the stator: the end of the rotating shaft close to the
发明的2.2kW双转子铁氧体永磁电机，与相似功率的商用感应电机及内置式钕铁硼永磁电机相比较，转矩密度分别为1Nm/kg、0.35Nm/kg、0.5Nm/kg，效率分别为87％、82％、86％。因此双转子电机与感应电机及内置式永磁电机相比具有高的效率和转矩密度，而双转子永磁电机的高转矩密度就意味着电机的体积小，耗用材料少，同时双转子电机采用铁氧体永磁，因此本项发明的双转子永磁电机成本低廉。The invented 2.2kW double-rotor ferrite permanent magnet motor, compared with similar power commercial induction motor and built-in NdFeB permanent magnet motor, the torque density is 1Nm/kg, 0.35Nm/kg, 0.5Nm/kg respectively , and the efficiencies are 87%, 82%, and 86%, respectively. Therefore, the dual-rotor motor has higher efficiency and torque density than the induction motor and the built-in permanent magnet motor, and the high torque density of the dual-rotor permanent magnet motor means that the motor is small in size and consumes less material. The rotor motor adopts ferrite permanent magnets, so the double rotor permanent magnet motor of the present invention has low cost.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100757643A CN100389533C (en) | 2004-12-30 | 2004-12-30 | Permanent magnet electric motor with double rotor |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100757643A CN100389533C (en) | 2004-12-30 | 2004-12-30 | Permanent magnet electric motor with double rotor |
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| CN1645719A true CN1645719A (en) | 2005-07-27 |
| CN100389533C CN100389533C (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100757643A Expired - Fee Related CN100389533C (en) | 2004-12-30 | 2004-12-30 | Permanent magnet electric motor with double rotor |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079559B (en) * | 2006-05-24 | 2010-06-02 | 本田技研工业株式会社 | Electric motor |
| CN102013781A (en) * | 2010-12-29 | 2011-04-13 | 北京奇峰聚能科技有限公司 | Brushless direct current motor with internal and external rotors and without core losses |
| CN102179436A (en) * | 2009-12-04 | 2011-09-14 | 尼克桑斯公司 | Device for continuous corrugation of a metallic tube |
| CN102497074A (en) * | 2011-12-26 | 2012-06-13 | 北京理工大学 | Multiphase fault tolerant permanent magnet motor based on birotor structure |
| CN101340131B (en) * | 2007-07-05 | 2012-07-18 | 松下电器产业株式会社 | Electric motor |
| CN101572452B (en) * | 2008-04-28 | 2012-12-19 | 宁波唯英能源科技有限公司 | Double-layer rotor aerogenerator |
| CN103872879A (en) * | 2014-03-05 | 2014-06-18 | 包海荣 | Reluctance-free alternating current generator |
| WO2015018083A1 (en) * | 2013-08-09 | 2015-02-12 | 深圳市配天电机技术有限公司 | Birotor motor as well as fan and compressor using same |
| CN108322002A (en) * | 2018-02-12 | 2018-07-24 | 山东大学 | A kind of fault tolerant type birotor bipolarity permanent magnet synchronous motor and method |
| CN109995218A (en) * | 2018-07-30 | 2019-07-09 | 熵零技术逻辑工程院集团股份有限公司 | A kind of motor |
| CN110311524A (en) * | 2019-06-18 | 2019-10-08 | 深圳市优必选科技股份有限公司 | Hollow cup brushless direct current motor and robot |
| CN110601474A (en) * | 2019-09-17 | 2019-12-20 | 淮阴工学院 | Radial magnetic field composite flux switching motor |
| CN112838728A (en) * | 2020-12-30 | 2021-05-25 | 顺丰科技有限公司 | Birotor permanent magnet synchronous motor and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2066636U (en) * | 1990-05-16 | 1990-11-28 | 张恩侗 | Magnetogenerator |
| CN2293153Y (en) * | 1997-06-09 | 1998-09-30 | 夏成明 | Double ring magnetic pole parallel winding rare-earth permanent-magnet DC electric machine |
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- 2004-12-30 CN CNB2004100757643A patent/CN100389533C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079559B (en) * | 2006-05-24 | 2010-06-02 | 本田技研工业株式会社 | Electric motor |
| CN101340131B (en) * | 2007-07-05 | 2012-07-18 | 松下电器产业株式会社 | Electric motor |
| CN101572452B (en) * | 2008-04-28 | 2012-12-19 | 宁波唯英能源科技有限公司 | Double-layer rotor aerogenerator |
| CN102179436B (en) * | 2009-12-04 | 2015-03-25 | 尼克桑斯公司 | Device for continuous corrugation of a metallic tube |
| CN102179436A (en) * | 2009-12-04 | 2011-09-14 | 尼克桑斯公司 | Device for continuous corrugation of a metallic tube |
| CN102013781A (en) * | 2010-12-29 | 2011-04-13 | 北京奇峰聚能科技有限公司 | Brushless direct current motor with internal and external rotors and without core losses |
| CN102497074A (en) * | 2011-12-26 | 2012-06-13 | 北京理工大学 | Multiphase fault tolerant permanent magnet motor based on birotor structure |
| WO2015018083A1 (en) * | 2013-08-09 | 2015-02-12 | 深圳市配天电机技术有限公司 | Birotor motor as well as fan and compressor using same |
| CN105453394A (en) * | 2013-08-09 | 2016-03-30 | 深圳市配天电机技术有限公司 | Birotor motor as well as fan and compressor using same |
| CN105453394B (en) * | 2013-08-09 | 2018-09-21 | 深圳市配天电机技术有限公司 | A kind of double-rotor machine and fan, compressor using this motor |
| CN103872879A (en) * | 2014-03-05 | 2014-06-18 | 包海荣 | Reluctance-free alternating current generator |
| CN108322002A (en) * | 2018-02-12 | 2018-07-24 | 山东大学 | A kind of fault tolerant type birotor bipolarity permanent magnet synchronous motor and method |
| CN109995218A (en) * | 2018-07-30 | 2019-07-09 | 熵零技术逻辑工程院集团股份有限公司 | A kind of motor |
| CN110311524A (en) * | 2019-06-18 | 2019-10-08 | 深圳市优必选科技股份有限公司 | Hollow cup brushless direct current motor and robot |
| CN110601474A (en) * | 2019-09-17 | 2019-12-20 | 淮阴工学院 | Radial magnetic field composite flux switching motor |
| CN112838728A (en) * | 2020-12-30 | 2021-05-25 | 顺丰科技有限公司 | Birotor permanent magnet synchronous motor and working method thereof |
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