CN107124053B - An alternating pole permanent magnet motor rotor using hybrid permanent magnets - Google Patents

An alternating pole permanent magnet motor rotor using hybrid permanent magnets Download PDF

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Publication number
CN107124053B
CN107124053B CN201710388163.5A CN201710388163A CN107124053B CN 107124053 B CN107124053 B CN 107124053B CN 201710388163 A CN201710388163 A CN 201710388163A CN 107124053 B CN107124053 B CN 107124053B
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permanent magnet
energy density
rotor
rotor core
tile
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CN107124053A (en
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王凯
李健
吴科明
刘闯
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • 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
    • H02K1/2746Inner 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 arranged with the same polarity, e.g. consequent pole type
    • 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/02Details of the magnetic circuit characterised by the magnetic material
    • 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
    • H02K1/24Rotor cores with salient poles ; Variable reluctance rotors
    • 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
    • H02K1/2786Outer rotors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02Details
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The invention discloses a kind of Consequent pole permanent magnet motor rotor using hybrid permanent-magnet, including rotor core section, magnetic guiding loop, high-energy density permanent magnet and low energy densities permanent magnet, a magnetic guiding loop is coaxially disposed between two neighboring rotor core section;Consequent pole permanent magnet motor rotor can be used as internal rotor, can also be used as outer rotor.The outer surface of each rotor core section or the inner surface circumferentially uniformly distributed outer salient pole for having p arc, wherein p is motor number of pole-pairs;An outer arcuate slot is formed between two neighboring outer salient pole, lays a high-energy density permanent magnet in each outer arcuate slot;It is circumferentially uniformly distributed on the inner or outer side anchor ring of each rotor core section to have n inner arc slot, and n >=p;A low energy densities permanent magnet is laid in each inner arc slot.The present invention can further increase the torque output capability of alternately pole surface formula magneto while saving motor cost and weakening alternately pole surface formula magneto shaft leakage field.

Description

一种采用混合永磁体的交替极永磁电机转子An alternating pole permanent magnet motor rotor using hybrid permanent magnets

技术领域technical field

本发明涉及电机设计领域,特别是一种采用混合永磁体的交替极永磁电机转子。The invention relates to the field of motor design, in particular to an alternating pole permanent magnet motor rotor using mixed permanent magnets.

背景技术Background technique

永磁电机具有高转矩密度和高效率,已经广泛应用于医疗器械、家用电器、电动汽车、风力发电和航空航天等领域。不同的永磁电机转子结构,使得磁路不同,这就使得电机性能、控制系统、制造工艺和适用场合也不同。根据永磁同步电机的坐标变换理论,表面式永磁电机的直轴磁路和交轴磁路。直轴磁路:永磁体→气隙→定子铁心→气隙→相邻的永磁体→转子铁心→回到永磁体。(图中定子铁心和气隙没有画出,但是行业内都知道)。交轴磁路:两个永磁体的边界处→气隙→定子铁心→气隙→相邻的两个永磁体的边界处→转子铁心→回到开始两个永磁体的边界处。Permanent magnet motors have high torque density and high efficiency, and have been widely used in medical equipment, household appliances, electric vehicles, wind power generation and aerospace. Different permanent magnet motor rotor structures make the magnetic circuit different, which makes the motor performance, control system, manufacturing process and applicable occasions different. According to the coordinate transformation theory of permanent magnet synchronous motor, the direct axis magnetic circuit and quadrature axis magnetic circuit of surface permanent magnet motor. Straight-axis magnetic circuit: permanent magnet → air gap → stator core → air gap → adjacent permanent magnet → rotor core → back to the permanent magnet. (The stator core and air gap are not shown in the figure, but they are known in the industry). Quadrature-axis magnetic circuit: at the boundary of two permanent magnets → air gap → stator core → air gap → at the boundary of two adjacent permanent magnets → rotor core → back to the boundary of the two permanent magnets.

可见,其直轴磁路的磁阻与交轴磁路的磁阻相等,所以其直轴电感等于交轴电感。It can be seen that the reluctance of the direct-axis magnetic circuit is equal to that of the quadrature-axis magnetic circuit, so the direct-axis inductance is equal to the quadrature-axis inductance.

永磁同步电机的电磁转矩Te表达式,如式(a)所示。The electromagnetic torque Te expression of the permanent magnet synchronous motor is shown in formula (a).

式(a)中,p为电机的极对数,ψpm为永磁磁链,Ld和Lq分别为直轴电感和交轴电感,id和iq分别为电枢绕组的直轴电流和交轴电流。Ia是正弦相电流的峰值,β是电流相位角。Tpm和Tr分别是永磁转矩分量和磁阻转矩分量。In formula (a), p is the number of pole pairs of the motor, ψ pm is the permanent magnet flux linkage, L d and L q are the direct-axis inductance and quadrature-axis inductance, respectively, and id and i q are the direct axis of the armature winding, respectively. current and quadrature current. I a is the peak value of the sinusoidal phase current and β is the current phase angle. T pm and Tr are the permanent magnet torque component and the reluctance torque component, respectively.

由于表面式永磁电机的直轴电感等于交轴电感,所以其磁阻转矩分量为0。只含有永磁转矩分量,即表面式永磁电机的电磁转矩Te表达式,可由式(b)所示。Since the direct-axis inductance of the surface-type permanent magnet motor is equal to the quadrature-axis inductance, its reluctance torque component is zero. It only contains the permanent magnet torque component, that is, the electromagnetic torque Te expression of the surface permanent magnet motor, which can be shown by formula (b).

表面式永磁电机转子的制造工艺简单,其输出转矩中不含有磁阻转矩分量,故控制方法简单,广泛应用于机床、机器人和医疗器械等伺服传动场合。传统的表面式永磁电机使用大量价格较高的稀土永磁材料,是其生产成本较高的主要原因。为了降低其成本,申请号为200710010915.0的发明专利,提供了一种表面式永磁伺服电机转子,永磁体与“假极”交替布置,永磁体的数量仅为传统表面式永磁电机的一半,节省了永磁材料,从而降低了电机的总成本。The manufacturing process of the surface type permanent magnet motor rotor is simple, and its output torque does not contain a reluctance torque component, so the control method is simple, and it is widely used in servo transmission occasions such as machine tools, robots and medical equipment. The traditional surface-type permanent magnet motor uses a large amount of high-priced rare earth permanent magnet materials, which is the main reason for its high production cost. In order to reduce its cost, the invention patent with the application number of 200710010915.0 provides a surface-type permanent magnet servo motor rotor. The permanent magnets and "dummy poles" are alternately arranged, and the number of permanent magnets is only half of the traditional surface-type permanent magnet motor. Permanent magnet material is saved, thereby reducing the overall cost of the motor.

然而,正如IEEE磁学会刊发表的文章:Comparative Analysis of End Effect inPartitioned Stator Flux Reversal Machines Having Surface-Mounted andConsequent Pole Permanent Magnets,所指出的,交替极结构的永磁电机,其端部漏磁比较严重。However, as pointed out in an article published in the Journal of the IEEE Magnetic Society: Comparative Analysis of End Effect in Partitioned Stator Flux Reversal Machines Having Surface-Mounted and Consequent Pole Permanent Magnets, the permanent magnet motor with alternating pole structure has serious magnetic leakage at the end.

另外,交替极表面式永磁电机的转轴端部会有单极性漏磁,使得电机的转轴端部发生磁化,这将对整个电机系统的可靠性和安全性产生影响。发明专利201611011019.1提出采用转子分段的方法,在转子和转轴内部提供漏磁路径,削弱了转轴端部的磁化。然而,两段转子交界处的漏磁会降低转矩输出能力,永磁体的利用率较低。In addition, the end of the rotating shaft of the alternating-pole surface permanent magnet motor will have unipolar magnetic leakage, which will make the end of the rotating shaft of the motor magnetized, which will affect the reliability and safety of the entire motor system. The invention patent 201611011019.1 proposes a method of rotor segmentation to provide a magnetic leakage path inside the rotor and the rotating shaft, which weakens the magnetization of the end of the rotating shaft. However, the flux leakage at the junction of the two rotors will reduce the torque output capability and the utilization of permanent magnets is low.

发明内容SUMMARY OF THE INVENTION

本发明要解决的技术问题是针对上述现有技术的不足,而提供一种采用混合永磁体的交替极永磁电机转子,该采用混合永磁体的交替极永磁电机转子能在节省电机成本和削弱交替极表面式永磁电机转轴漏磁的同时,进一步提高交替极表面式永磁电机的转矩输出能力。The technical problem to be solved by the present invention is aimed at the deficiencies of the above-mentioned prior art, and provides an alternating pole permanent magnet motor rotor using mixed permanent magnets. The alternating pole permanent magnet motor rotor using mixed permanent magnets can save motor costs and reduce costs. While weakening the magnetic leakage of the rotating shaft of the alternating pole surface type permanent magnet motor, the torque output capability of the alternating pole surface type permanent magnet motor is further improved.

为解决上述技术问题,本发明采用的技术方案是:In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

一种采用混合永磁体的交替极永磁电机转子,包括转子铁心段、导磁环、高能量密度永磁体和低能量密度永磁体。An alternating pole permanent magnet motor rotor using mixed permanent magnets includes a rotor core segment, a magnetic conducting ring, a high energy density permanent magnet and a low energy density permanent magnet.

转子铁心段至少有两个,且均同轴设置;相邻两个转子铁心段之间同轴设置一个导磁环。There are at least two rotor core segments, and they are all coaxially arranged; a magnetic conducting ring is coaxially arranged between two adjacent rotor core segments.

交替极永磁电机转子能作为内转子,也能作为外转子。The alternating pole permanent magnet motor rotor can be used as an inner rotor as well as an outer rotor.

当交替极永磁电机转子作为内转子时,布设方式包括。When the alternating pole permanent magnet motor rotor is used as the inner rotor, the layout includes.

1)转子铁心段和导磁环均同轴套装在转轴上。1) Both the rotor core segment and the magnetic conductive ring are coaxially sleeved on the rotating shaft.

2)每个转子铁心段的外表面沿周向均匀布设有p个弧形的外凸极,其中,p为电机极对数;相邻两个外凸极之间形成一个外弧形槽,每个外弧形槽内布设一个外瓦片式永磁体,每个外瓦片式永磁体均为高能量密度永磁体。2) The outer surface of each rotor core segment is evenly distributed with p arc-shaped outer salient poles along the circumferential direction, where p is the number of motor pole pairs; an outer arc-shaped slot is formed between two adjacent outer salient poles, An outer tile-type permanent magnet is arranged in each outer arc-shaped slot, and each outer tile-type permanent magnet is a permanent magnet with high energy density.

3)每个转子铁心段的内侧圆环面上沿周向均匀布设有n个内弧形槽,且n≥p;每个内弧形槽的内径均大于转子铁心段的内径,相邻两个内弧形槽之间的转子铁心段构成内加强筋;每个内弧形槽内布设一个内瓦片式永磁体,每个内瓦片式永磁体均为低能量密度永磁体。3) On the inner annular surface of each rotor core segment, n inner arc-shaped grooves are uniformly distributed in the circumferential direction, and n≥p; the inner diameter of each inner arc-shaped groove is larger than the inner diameter of the rotor core segment, and two adjacent The rotor core segments between the inner arc-shaped slots constitute inner reinforcing ribs; an inner-tile-type permanent magnet is arranged in each inner-arc-shaped slot, and each inner tile-type permanent magnet is a low-energy density permanent magnet.

当交替极永磁电机转子作为外转子时,布设方式包括。When the alternating pole permanent magnet motor rotor is used as the outer rotor, the layout includes.

(1)每个转子铁心段的外侧圆环面上沿周向均匀布设有n个外弧形槽,且n≥p;每个外弧形槽的外径均小于转子铁心段的外径,相邻两个外弧形槽之间的转子铁心段构成外加强筋;每个外弧形槽内布设一个外瓦片式永磁体,每个外瓦片式永磁体均为低能量密度永磁体;(1) There are n outer arc grooves uniformly distributed on the outer annular surface of each rotor core segment along the circumferential direction, and n≥p; the outer diameter of each outer arc groove is smaller than the outer diameter of the rotor core segment, The rotor core segment between two adjacent outer arc-shaped slots constitutes an outer reinforcing rib; an outer tile-type permanent magnet is arranged in each outer arc-shaped slot, and each outer tile-type permanent magnet is a low-energy density permanent magnet ;

(2)每个转子铁心段的内表面沿周向均匀布设有p个弧形的的内凸极,相邻两个内凸极之间形成一个内弧形槽,每个内弧形槽内布设一个内瓦片式永磁体,每个内瓦片式永磁体均为高能量密度永磁体。(2) p arc-shaped inner salient poles are evenly distributed on the inner surface of each rotor core segment along the circumferential direction, and an inner arc-shaped slot is formed between two adjacent inner salient poles, and each inner arc-shaped slot is An inner tile type permanent magnet is arranged, and each inner tile type permanent magnet is a high energy density permanent magnet.

交替极永磁电机转子无论作为内转子,还是作为外转子,均还具有如下布设方式。The alternating pole permanent magnet motor rotor also has the following arrangement, whether it is used as an inner rotor or an outer rotor.

相邻两个转子铁心段上的高能量密度永磁体沿周向偏移的电周期角度为360°/2p。The electrical period angle of the high-energy-density permanent magnets on the two adjacent rotor core segments offset in the circumferential direction is 360°/2p.

位于同一个转子铁心段上的所有外瓦片式永磁体的充磁方向一致,位于同一个转子铁心段上的所有内瓦片式永磁体的充磁方向一致,位于同一个转子铁心段上的外瓦片式永磁体和内瓦片式永磁体的充磁方向相反。The magnetization directions of all the outer tile permanent magnets located on the same rotor core segment are the same, and the magnetization directions of all inner tile permanent magnets located on the same rotor core segment are the same. The magnetization directions of the outer tiled permanent magnets and the inner tiled permanent magnets are opposite.

相邻两个转子铁心段上的外瓦片式永磁体的充磁方向相反;相邻两个转子铁心段上的内瓦片式永磁体的充磁方向相反。The magnetization directions of the outer tile-type permanent magnets on the two adjacent rotor core segments are opposite; the magnetization directions of the inner tile-type permanent magnets on the two adjacent rotor core segments are opposite.

每个外瓦片式永磁体和每个内瓦片式永磁体的两侧均设置有隔磁槽。Magnetic isolation slots are provided on both sides of each outer tile-type permanent magnet and each inner tile-type permanent magnet.

高能量密度永磁体两侧的隔磁槽的系数其中θb1为高能量密度永磁体两侧的隔磁槽的圆心角,θm1为高能量密度永磁体的圆心角;kc1取值范围为0-0.2。Coefficient of magnetic isolation slots on both sides of high energy density permanent magnets Wherein θ b1 is the central angle of the magnetic isolation slot on both sides of the high energy density permanent magnet, θ m1 is the central angle of the high energy density permanent magnet; the value range of k c1 is 0-0.2.

低能量密度永磁体两侧的隔磁槽的系数其中θb2为低能量密度永磁体两侧的隔磁槽的圆心角,kc2取值范围在0-0.2之间。Coefficient of magnetic isolation slots on both sides of low energy density permanent magnets Wherein θ b2 is the central angle of the magnetic isolation slot on both sides of the low energy density permanent magnet, and the value of k c2 ranges from 0 to 0.2.

导磁环的外周或内周同轴套设有轴向充磁永磁体;假设轴向充磁永磁体的外径为r1,高能量密度永磁体的外径为r3,高能量密度永磁体的内径为r4,则r3≤r1≤r4。The outer or inner circumference of the magnetic conducting ring is coaxially sleeved with an axially magnetized permanent magnet; it is assumed that the outer diameter of the axially magnetized permanent magnet is r1, the outer diameter of the high-energy density permanent magnet is r3, and the outer diameter of the high-energy density permanent magnet is r3. The inner diameter is r4, then r3≤r1≤r4.

位于同一个转子铁心段两侧的两个轴向充磁永磁体的充磁方向相反。The magnetization directions of the two axially magnetized permanent magnets located on both sides of the same rotor core segment are opposite.

导磁环的轴向长度系数其中La为导磁环的轴向长度,Lef为电机整机的有效轴向长度;ka取值范围为0-0.1。Axial Length Factor of Magnetic Ring Wherein L a is the axial length of the magnetic permeable ring, L ef is the effective axial length of the motor as a whole; the value range of ka is 0-0.1.

高能量密度永磁体的极弧系数αp1=θm1p/(2π),其中θm1为高能量密度永磁体的圆心角,αp1取值范围为0.35-0.75。The pole arc coefficient α p1m1 p/(2π) of the high energy density permanent magnet, where θ m1 is the central angle of the high energy density permanent magnet, and the value of α p1 ranges from 0.35 to 0.75.

低能量密度永磁体的极弧系数αp2=θm2n/(2π),其中n为低能量密度永磁体槽的个数,θm2为低能量密度永磁体的圆心角,αp2取值范围为0.7-0.99。The pole arc coefficient α p2 = θ m2 n/(2π) of the low energy density permanent magnet, where n is the number of low energy density permanent magnet slots, θ m2 is the central angle of the low energy density permanent magnet, and the value range of α p2 is 0.7-0.99.

高能量密度永磁体为钕铁硼,低能量密度永磁体为铁氧体。The high energy density permanent magnet is NdFeB, and the low energy density permanent magnet is ferrite.

本发明采用上述结构后,能在节省电机成本和削弱交替极表面式永磁电机转轴漏磁的同时,进一步提高交替极表面式永磁电机的转矩输出能力。After adopting the above structure, the present invention can further improve the torque output capability of the alternating pole surface type permanent magnet motor while saving the motor cost and weakening the magnetic leakage of the rotating shaft of the alternating pole surface type permanent magnet motor.

附图说明Description of drawings

图1显示了本发明作为内转子时转子铁心段的二维结构示意图。Fig. 1 shows a schematic diagram of the two-dimensional structure of the rotor core segment when the present invention is used as an inner rotor.

图2显示了本发明作为内转子时相邻两个转子铁心段中永磁体充磁方向二维示意图。FIG. 2 shows a two-dimensional schematic diagram of the magnetization direction of permanent magnets in two adjacent rotor core segments when the present invention is used as an inner rotor.

图3显示了本发明作为内转子且不含轴向充磁永磁体时的三维结构示意图。FIG. 3 shows a schematic diagram of the three-dimensional structure of the present invention when it is used as an inner rotor and does not contain an axially magnetized permanent magnet.

图4显示了本发明作为内转子时转轴端部漏磁磁通路径图。FIG. 4 shows the path diagram of the leakage magnetic flux at the end of the rotating shaft when the present invention is used as an inner rotor.

图5显示了本发明作为内转子时低能量密度永磁体的主磁通路径图。Figure 5 shows the main magnetic flux path diagram of the low energy density permanent magnet of the present invention as an inner rotor.

图6显示了本发明作为内转子且含有轴向充磁永磁体时的三维结构示意图。FIG. 6 shows a schematic diagram of the three-dimensional structure of the present invention when it is used as an inner rotor and contains axially magnetized permanent magnets.

图7显示了本发明作为外转子时相邻两个转子铁心段中永磁体充磁方向二维示意图。FIG. 7 shows a two-dimensional schematic diagram of the magnetization direction of permanent magnets in two adjacent rotor core segments when the present invention is used as an outer rotor.

图8显示了本发明作为外转子时的三维结构示意图。Fig. 8 shows a schematic diagram of the three-dimensional structure of the present invention as an outer rotor.

图9显示了本发明与现有技术电机的电磁转矩对比(半个电周期)。Figure 9 shows the electromagnetic torque comparison (half electrical cycle) of the present invention and a prior art machine.

其中有:Including:

10.转子铁心段;11.外凸极;12.外弧形槽;13.内加强筋;14.内弧形槽;15.隔磁槽;16.内凸极;17.外加强筋;10. Rotor core segment; 11. Outer salient pole; 12. Outer arc groove; 13. Inner reinforcing rib; 14. Inner arc groove; 15. Magnetic isolation slot; 16. Inner salient pole; 17. Outer reinforcing rib;

21.高能量密度永磁体;22.低能量密度永磁体;21. High energy density permanent magnet; 22. Low energy density permanent magnet;

30.导磁环;31.轴向充磁永磁体;30. Magnetic ring; 31. Axial magnetized permanent magnet;

40.转轴;50.转轴端部漏磁磁通路径;60.主磁通路径。40. The rotating shaft; 50. The leakage magnetic flux path at the end of the rotating shaft; 60. The main magnetic flux path.

具体实施方式Detailed ways

下面结合附图和具体较佳实施方式对本发明作进一步详细的说明。The present invention will be described in further detail below with reference to the accompanying drawings and specific preferred embodiments.

本发明以10极电机(5对极,即p=5)为例,分别以作为内转子和外转子单独进行说明。The present invention takes a 10-pole motor (5 pairs of poles, that is, p=5) as an example, and is separately described as an inner rotor and an outer rotor.

一、交替极永磁电机转子作为内转子使用1. The rotor of alternating pole permanent magnet motor is used as the inner rotor

如图1至图6所示,一种采用混合永磁体的交替极永磁电机转子,包括转子铁心段10、导磁环30、高能量密度永磁体21和低能量密度永磁体22。As shown in FIGS. 1 to 6 , an alternating pole permanent magnet motor rotor using hybrid permanent magnets includes a rotor core segment 10 , a magnetic permeable ring 30 , high energy density permanent magnets 21 and low energy density permanent magnets 22 .

高能量密度永磁体优选为钕铁硼,低能量密度永磁体优选为铁氧体。The high energy density permanent magnet is preferably NdFeB, and the low energy density permanent magnet is preferably ferrite.

转子铁心段至少有两个,相邻两个转子铁心段之间同轴设置一个导磁环。There are at least two rotor core segments, and a magnetic conducting ring is coaxially arranged between two adjacent rotor core segments.

本发明中将以两个转子铁心段为例进行详细说明,导磁环将为1个。两个转子铁心段和一个导磁环均同轴套装在转轴上。In the present invention, two rotor core segments will be taken as an example for detailed description, and there will be one magnetic conducting ring. Two rotor core segments and a magnetic conducting ring are coaxially sleeved on the rotating shaft.

每个转子铁心段的外表面沿周向均匀布设有p个弧形的外凸极,其中,p为电机极对数,本发明中p=5。The outer surface of each rotor core segment is uniformly distributed with p arc-shaped outer salient poles along the circumferential direction, where p is the number of motor pole pairs, and p=5 in the present invention.

相邻两个外凸极之间形成一个外弧形槽,每个外弧形槽内布设一个外瓦片式永磁体,每个外瓦片式永磁体均为高能量密度永磁体。An outer arc-shaped slot is formed between two adjacent outer salient poles, and an outer tile-type permanent magnet is arranged in each outer arc-shaped slot, and each outer tile-type permanent magnet is a high-energy density permanent magnet.

每个转子铁心段的内侧圆环面上沿周向均匀布设有n个内弧形槽,且n≥p,本发明中,优选n=5。On the inner annular surface of each rotor core segment, n inner arc-shaped grooves are uniformly distributed along the circumferential direction, and n≥p, in the present invention, preferably n=5.

每个内弧形槽的内径均大于转子铁心段的内径。The inner diameter of each inner arc groove is larger than the inner diameter of the rotor core segment.

相邻两个内弧形槽之间的转子铁心段构成内加强筋13;每个内弧形槽内布设一个内瓦片式永磁体,每个内瓦片式永磁体均为低能量密度永磁体。The rotor core segment between the two adjacent inner arc slots constitutes the inner reinforcing rib 13; an inner tile permanent magnet is arranged in each inner arc slot, and each inner tile permanent magnet is a permanent magnet with low energy density. magnet.

相邻两个转子铁心段上的外瓦片式永磁体(也即高能量密度永磁体)沿周向偏移的电周期角度为360°/2p,本发明优选为36°。The electrical period angle at which the outer tile-type permanent magnets (ie high-energy density permanent magnets) on two adjacent rotor core segments are offset in the circumferential direction is 360°/2p, which is preferably 36° in the present invention.

如图2所示,位于同一个转子铁心段上的所有外瓦片式永磁体的充磁方向一致,位于同一个转子铁心段上的所有内瓦片式永磁体的充磁方向一致,位于同一个转子铁心段上的外瓦片式永磁体和内瓦片式永磁体的充磁方向相反。As shown in Figure 2, the magnetization directions of all outer tile-type permanent magnets located on the same rotor core segment are the same, and the magnetization directions of all inner tile-type permanent magnets located on the same rotor core segment are the same. The magnetization directions of the outer shingled permanent magnets and the inner shingled permanent magnets on one rotor core segment are opposite.

相邻两个转子铁心段上的外瓦片式永磁体的充磁方向相反;相邻两个转子铁心段上的内瓦片式永磁体的充磁方向相反。The magnetization directions of the outer tile-type permanent magnets on the two adjacent rotor core segments are opposite; the magnetization directions of the inner tile-type permanent magnets on the two adjacent rotor core segments are opposite.

每个外瓦片式永磁体和每个内瓦片式永磁体的两侧均设置有隔磁槽15。Magnetic isolation slots 15 are provided on both sides of each outer tile-type permanent magnet and each inner tile-type permanent magnet.

外瓦片式永磁体两侧的隔磁槽的系数其中θb1为外瓦片式永磁体两侧的隔磁槽的圆心角,θm1为外瓦片式永磁体的圆心角;kc1取值范围为0-0.2。Coefficient of magnetic isolation slots on both sides of outer tile permanent magnets Wherein θ b1 is the central angle of the magnetic isolation slots on both sides of the outer tile type permanent magnet, θ m1 is the central angle of the outer tile type permanent magnet; the value range of k c1 is 0-0.2.

内瓦片式永磁体两侧的隔磁槽的系数其中θb2为内瓦片式永磁体两侧的隔磁槽的圆心角,kc2取值范围在0-0.2之间。Coefficient of magnetic isolation slot on both sides of inner tile permanent magnet Wherein θ b2 is the central angle of the magnetic isolation slot on both sides of the inner tile-type permanent magnet, and the value of k c2 ranges from 0 to 0.2.

导磁环的外周同轴套设有轴向充磁永磁体31,轴向充磁永磁体31既可以是高能量密度永磁体,也可以是低能量密度永磁体,本发明中优选为高能量密度永磁体。The outer circumference of the magnetic conducting ring is coaxially sleeved with an axially magnetized permanent magnet 31. The axially magnetized permanent magnet 31 can be either a high-energy density permanent magnet or a low-energy density permanent magnet. In the present invention, a high-energy permanent magnet is preferred. Density permanent magnets.

如图9所示,轴向充磁永磁体31的设置,能大幅提高交替极永磁电机的转矩输出能力。As shown in FIG. 9 , the arrangement of the axially magnetized permanent magnets 31 can greatly improve the torque output capability of the alternating pole permanent magnet motor.

假设轴向充磁永磁体的外径为r1,高能量密度永磁体的外径为r3,高能量密度永磁体的内径为r4,则r3≤r1≤r4。Assuming that the outer diameter of the axially magnetized permanent magnet is r1, the outer diameter of the high energy density permanent magnet is r3, and the inner diameter of the high energy density permanent magnet is r4, then r3≤r1≤r4.

位于同一个转子铁心段两侧的两个轴向充磁永磁体的充磁方向相反。The magnetization directions of the two axially magnetized permanent magnets located on both sides of the same rotor core segment are opposite.

导磁环的轴向长度系数其中La为导磁环的轴向长度,Lef为电机整机的有效轴向长度,也就是所有转子铁心轴长加上导磁环的轴长;ka取值范围为0-0.1。Axial Length Factor of Magnetic Ring Among them, L a is the axial length of the magnetic permeable ring, and L ef is the effective axial length of the motor, that is, the shaft length of all rotor cores plus the axial length of the magnetic permeable ring; the value range of ka is 0-0.1.

外瓦片式永磁体的极弧系数αp1=θm1p/(2π),其中θm1为外瓦片式永磁体的圆心角,αp1取值范围为0.35-0.75。The pole arc coefficient α p1m1 p/(2π) of the outer tile permanent magnet, where θ m1 is the central angle of the outer tile permanent magnet, and the value range of α p1 is 0.35-0.75.

内瓦片式永磁体的极弧系数αp2=θm2n/(2π),其中n为内瓦片式永磁体槽的个数,θm2为内瓦片式永磁体的圆心角,αp2取值范围为0.7-0.99。The pole arc coefficient α p2m2 n/(2π) of the inner tile permanent magnet, where n is the number of inner tile permanent magnet slots, θ m2 is the central angle of the inner tile permanent magnet, α p2 The value range is 0.7-0.99.

在交替极永磁电机的内侧设置有内弧形槽,用于放置低能量密度永磁体。由于内弧形槽的存在,所以外瓦片式永磁体通过转轴端部的漏磁的磁通路径中的磁阻变大,因此由外瓦片式永磁体产生的转轴端部的漏磁降低了,如图4所示的转轴端部漏磁磁通路径50。由于内瓦片式永磁体也采用单极性充磁,所以相邻两段的低能量密度永磁体的充磁方向相反,这样磁路可以通过定子铁心、两段转子铁心和导磁环构成闭合的回路:一段内瓦片式永磁体→外凸极→气隙→定子铁心→气隙→另一段外凸极→另一段内瓦片式永磁体→导磁环→回到开始的内瓦片式永磁体,如图5所示的内瓦片式永磁体的主磁通路径60。正是因为内瓦片式永磁体的主磁通路径经过导磁环闭合,其产生的转轴端部漏磁很小。另外,内瓦片式永磁体可以进一步增加电机的主磁通,从而提高交替极永磁电机的转矩输出能力。如图9所示,本发明的电磁转矩远高于背景技术201611011019.1中的电磁转矩。An inner arc-shaped slot is provided on the inner side of the alternating pole permanent magnet motor for placing low energy density permanent magnets. Due to the existence of the inner arc-shaped slot, the magnetic resistance in the magnetic flux path of the outer tile-type permanent magnet through the magnetic flux leakage at the end of the rotating shaft increases, so the magnetic leakage at the end of the rotating shaft generated by the outer tile-type permanent magnet is reduced. Now, the leakage magnetic flux path 50 at the end of the rotating shaft is shown in FIG. 4 . Since the inner tile-type permanent magnet also adopts unipolar magnetization, the magnetization directions of the two adjacent low-energy density permanent magnets are opposite, so that the magnetic circuit can be closed by the stator core, the two-stage rotor core and the magnetic conducting ring. The loop: one segment of inner tile permanent magnets→outer salient poles→air gap→stator core→air gap→another segment of outer salient poles→another segment of inner tiled permanent magnets→magnetic conductive ring→return to the inner tile at the beginning type permanent magnet, such as the main magnetic flux path 60 of the inner tile type permanent magnet as shown in FIG. 5 . It is precisely because the main magnetic flux path of the inner tile-type permanent magnet is closed by the magnetic conducting ring, the magnetic flux leakage at the end of the rotating shaft is very small. In addition, the inner tile type permanent magnet can further increase the main magnetic flux of the motor, thereby improving the torque output capability of the alternating pole permanent magnet motor. As shown in FIG. 9 , the electromagnetic torque of the present invention is much higher than that of the background art 201611011019.1.

二、交替极永磁电机转子作为外转子使用2. The rotor of alternating pole permanent magnet motor is used as the outer rotor

如图7和图8所示,一种采用混合永磁体的交替极永磁电机转子,也包括转子铁心段10、导磁环30、高能量密度永磁体21和低能量密度永磁体22。As shown in FIGS. 7 and 8 , an alternating pole permanent magnet motor rotor using hybrid permanent magnets also includes a rotor core segment 10 , a magnetic permeable ring 30 , high energy density permanent magnets 21 and low energy density permanent magnets 22 .

转子铁心段至少有两个,相邻两个转子铁心段之间同轴设置一个导磁环。There are at least two rotor core segments, and a magnetic conducting ring is coaxially arranged between two adjacent rotor core segments.

本发明中将以两个转子铁心段为例进行详细说明,导磁环将为1个。In the present invention, two rotor core segments will be taken as an example for detailed description, and there will be one magnetic conducting ring.

定子同轴固定套装在固定轴的外周,两者形成为一体结构;固定轴两端分别从定子两端伸出,并且固定轴的两个伸出端各套装一个轴承。The stator is coaxially fixed and sleeved on the outer circumference of the fixed shaft, and the two form an integrated structure; two ends of the fixed shaft respectively protrude from both ends of the stator, and each of the two extended ends of the fixed shaft is sleeved with a bearing.

两个转子铁心段和一个导磁环均同轴套设在定子外周,并且通过支撑体同轴安装在轴承上。Two rotor core segments and a magnetic conducting ring are coaxially sleeved on the outer circumference of the stator, and are coaxially mounted on the bearing through the support body.

每个转子铁心段的内表面沿周向均匀布设有p个弧形的的内凸极,本发明中优选p=5。P arc-shaped inner salient poles are uniformly distributed on the inner surface of each rotor core segment along the circumferential direction, and preferably p=5 in the present invention.

相邻两个内凸极之间形成一个内弧形槽,每个内弧形槽内布设一个内瓦片式永磁体,每个内瓦片式永磁体均为高能量密度永磁体。An inner arc slot is formed between two adjacent inner salient poles, and an inner tile type permanent magnet is arranged in each inner arc slot, and each inner tile type permanent magnet is a permanent magnet with high energy density.

每个转子铁心段的外侧圆环面上沿周向均匀布设有n个外弧形槽,且n≥p,本发明中优选n=5。On the outer annular surface of each rotor core segment, n outer arc grooves are uniformly distributed along the circumferential direction, and n≥p, preferably n=5 in the present invention.

每个外弧形槽的外径均小于转子铁心段的外径,相邻两个外弧形槽之间的转子铁心段构成外加强筋17。The outer diameter of each outer arc-shaped slot is smaller than the outer diameter of the rotor core segment, and the rotor core segment between two adjacent outer arc-shaped slots constitutes an outer reinforcing rib 17 .

每个外弧形槽内布设一个外瓦片式永磁体,每个外瓦片式永磁体均为低能量密度永磁体。An outer tile-type permanent magnet is arranged in each outer arc-shaped slot, and each outer tile-type permanent magnet is a low-energy density permanent magnet.

相邻两个转子铁心段上的内瓦片式永磁体(也即高能量密度永磁体)沿周向偏移的电周期角度为360°/2p,本发明优选为36°。The electrical period angle at which the inner tile-type permanent magnets (ie high-energy density permanent magnets) on two adjacent rotor core segments are offset in the circumferential direction is 360°/2p, which is preferably 36° in the present invention.

如图7所示,位于同一个转子铁心段上的所有外瓦片式永磁体的充磁方向一致,位于同一个转子铁心段上的所有内瓦片式永磁体的充磁方向一致,位于同一个转子铁心段上的外瓦片式永磁体和内瓦片式永磁体的充磁方向相反。As shown in Figure 7, the magnetization directions of all the outer tile-type permanent magnets located on the same rotor core segment are the same, and the magnetization directions of all the inner tile-type permanent magnets located on the same rotor core segment are the same. The magnetization directions of the outer shingled permanent magnets and the inner shingled permanent magnets on one rotor core segment are opposite.

相邻两个转子铁心段上的外瓦片式永磁体的充磁方向相反;相邻两个转子铁心段上的内瓦片式永磁体的充磁方向相反。The magnetization directions of the outer tile-type permanent magnets on the two adjacent rotor core segments are opposite; the magnetization directions of the inner tile-type permanent magnets on the two adjacent rotor core segments are opposite.

每个外瓦片式永磁体和每个内瓦片式永磁体的两侧均设置有隔磁槽15。Magnetic isolation slots 15 are provided on both sides of each outer tile-type permanent magnet and each inner tile-type permanent magnet.

高能量密度永磁体两侧的隔磁槽的系数其中θb1为高能量密度永磁体两侧的隔磁槽的圆心角,θm1为高能量密度永磁体的圆心角;kc1取值范围为0-0.2。Coefficient of magnetic isolation slots on both sides of high energy density permanent magnets Wherein θ b1 is the central angle of the magnetic isolation slot on both sides of the high energy density permanent magnet, θ m1 is the central angle of the high energy density permanent magnet; the value range of k c1 is 0-0.2.

低能量密度永磁体两侧的隔磁槽的系数其中θb2为低能量密度永磁体两侧的隔磁槽的圆心角,kc2取值范围在0-0.2之间。Coefficient of magnetic isolation slots on both sides of low energy density permanent magnets Wherein θ b2 is the central angle of the magnetic isolation slot on both sides of the low energy density permanent magnet, and the value of k c2 ranges from 0 to 0.2.

导磁环的内周同轴套设有轴向充磁永磁体,轴向充磁永磁体既可以是高能量密度永磁体,也可以是低能量密度永磁体,本发明中优选为高能量密度永磁体。The inner circumference of the magnetic conducting ring is coaxially sleeved with an axially magnetized permanent magnet. The axially magnetized permanent magnet can be either a high-energy density permanent magnet or a low-energy density permanent magnet. In the present invention, a high-energy density permanent magnet is preferred. Permanent magnets.

如图9所示,轴向充磁永磁体31的设置,能大幅提高交替极永磁电机的转矩输出能力。As shown in FIG. 9 , the arrangement of the axially magnetized permanent magnets 31 can greatly improve the torque output capability of the alternating pole permanent magnet motor.

假设轴向充磁永磁体的外径为r1,高能量密度永磁体的外径为r3,高能量密度永磁体的内径为r4,则r3≤r1≤r4。Assuming that the outer diameter of the axially magnetized permanent magnet is r1, the outer diameter of the high energy density permanent magnet is r3, and the inner diameter of the high energy density permanent magnet is r4, then r3≤r1≤r4.

位于同一个转子铁心段两侧的两个轴向充磁永磁体的充磁方向相反。The magnetization directions of the two axially magnetized permanent magnets located on both sides of the same rotor core segment are opposite.

导磁环的轴向长度系数其中La为导磁环的轴向长度,Lef为电机整机的有效轴向长度;ka取值范围为0-0.1。Axial Length Factor of Magnetic Ring Wherein L a is the axial length of the magnetic permeable ring, L ef is the effective axial length of the whole motor; the value range of ka is 0-0.1.

高能量密度永磁体的极弧系数αp1=θm1p/(2π),其中θm1为高能量密度永磁体的圆心角,αp1取值范围为0.35-0.75。The pole arc coefficient α p1m1 p/(2π) of the high energy density permanent magnet, where θ m1 is the central angle of the high energy density permanent magnet, and the value of α p1 ranges from 0.35 to 0.75.

低能量密度永磁体的极弧系数αp2=θm2n/(2π),其中n为低能量密度永磁体槽的个数,θm2为低能量密度永磁体的圆心角,αp2取值范围为0.7-0.99。The pole arc coefficient α p2 = θ m2 n/(2π) of the low energy density permanent magnet, where n is the number of low energy density permanent magnet slots, θ m2 is the central angle of the low energy density permanent magnet, and the value range of α p2 is 0.7-0.99.

作为外转子时,在交替极永磁电机的外侧设置有外弧形槽,用于放置低能量密度永磁体。由于外弧形槽的存在,所以内瓦片式永磁体通过固定轴端部的漏磁的磁通路径中的磁阻变大,因此由内瓦片式永磁体产生的固定轴端部的漏磁降低了。由于外瓦片式永磁体也采用单极性充磁,所以相邻两段的低能量密度永磁体的充磁方向相反,外瓦片式永磁体的主磁通路径经过导磁环闭合,其产生的固定轴端部漏磁很小。另外,外瓦片式永磁体可以进一步增加电机的主磁通,从而提高交替极永磁电机的转矩输出能力。When used as an outer rotor, an outer arc-shaped slot is arranged on the outer side of the alternating pole permanent magnet motor for placing low energy density permanent magnets. Due to the existence of the outer arc-shaped slot, the magnetic resistance in the magnetic flux path of the inner tile-type permanent magnet through the leakage flux at the end of the fixed shaft becomes larger, so the leakage of the inner tile-type permanent magnet at the end of the fixed shaft is generated. Magnetism decreased. Since the outer tile-type permanent magnet also adopts unipolar magnetization, the magnetization directions of the two adjacent low-energy density permanent magnets are opposite, and the main magnetic flux path of the outer tile-type permanent magnet is closed by the magnetic conducting ring. The resulting magnetic flux leakage at the end of the fixed shaft is very small. In addition, the outer tile type permanent magnet can further increase the main magnetic flux of the motor, thereby improving the torque output capability of the alternating pole permanent magnet motor.

以上详细描述了本发明的优选实施方式,但是,本发明并不限于上述实施方式中的具体细节,在本发明的技术构思范围内,可以对本发明的技术方案进行多种等同变换,这些等同变换均属于本发明的保护范围。The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention. These equivalent transformations All belong to the protection scope of the present invention.

Claims (10)

1.一种采用混合永磁体的交替极永磁电机转子,其特征在于:包括转子铁心段、导磁环、高能量密度永磁体和低能量密度永磁体;1. a kind of alternating pole permanent magnet motor rotor adopting hybrid permanent magnet, it is characterized in that: comprise rotor core segment, magnetic permeable ring, high energy density permanent magnet and low energy density permanent magnet; 转子铁心段至少有两个,且均同轴设置;相邻两个转子铁心段之间同轴设置一个导磁环;There are at least two rotor core segments, and they are all coaxially arranged; a magnetic conducting ring is coaxially arranged between two adjacent rotor core segments; 交替极永磁电机转子能作为内转子,也能作为外转子;The rotor of the alternating pole permanent magnet motor can be used as an inner rotor or an outer rotor; 当交替极永磁电机转子作为内转子时,布设方式包括:When the alternating pole permanent magnet motor rotor is used as the inner rotor, the layout methods include: 1)转子铁心段和导磁环均同轴套装在转轴上;1) The rotor core segment and the magnetic conductive ring are coaxially sleeved on the rotating shaft; 2)每个转子铁心段的外表面沿周向均匀布设有p个弧形的外凸极,其中,p为电机极对数;相邻两个外凸极之间形成一个外弧形槽,每个外弧形槽内布设一个外瓦片式永磁体,每个外瓦片式永磁体均为高能量密度永磁体;2) The outer surface of each rotor core segment is evenly distributed with p arc-shaped outer salient poles along the circumferential direction, where p is the number of motor pole pairs; an outer arc-shaped slot is formed between two adjacent outer salient poles, An outer tile-type permanent magnet is arranged in each outer arc-shaped slot, and each outer tile-type permanent magnet is a high-energy density permanent magnet; 3)每个转子铁心段的内侧圆环面上沿周向均匀布设有n个内弧形槽,且n≥p;每个内弧形槽的内径均大于转子铁心段的内径,相邻两个内弧形槽之间的转子铁心段构成内加强筋;每个内弧形槽内布设一个内瓦片式永磁体,每个内瓦片式永磁体均为低能量密度永磁体;3) On the inner annular surface of each rotor core segment, n inner arc-shaped grooves are uniformly distributed in the circumferential direction, and n≥p; the inner diameter of each inner arc-shaped groove is larger than the inner diameter of the rotor core segment, and two adjacent The rotor core segment between the inner arc slots constitutes an inner reinforcing rib; an inner tile permanent magnet is arranged in each inner arc slot, and each inner tile permanent magnet is a low energy density permanent magnet; 当交替极永磁电机转子作为外转子时,布设方式包括:When the alternating pole permanent magnet motor rotor is used as the outer rotor, the layout includes: (1)每个转子铁心段的外侧圆环面上沿周向均匀布设有n个外弧形槽,且n≥p;每个外弧形槽的外径均小于转子铁心段的外径,相邻两个外弧形槽之间的转子铁心段构成外加强筋;每个外弧形槽内布设一个外瓦片式永磁体,每个外瓦片式永磁体均为低能量密度永磁体;(1) There are n outer arc grooves uniformly distributed on the outer annular surface of each rotor core segment along the circumferential direction, and n≥p; the outer diameter of each outer arc groove is smaller than the outer diameter of the rotor core segment, The rotor core segment between two adjacent outer arc-shaped slots constitutes an outer reinforcing rib; an outer tile-type permanent magnet is arranged in each outer arc-shaped slot, and each outer tile-type permanent magnet is a low-energy density permanent magnet ; (2)每个转子铁心段的内表面沿周向均匀布设有p个弧形的的内凸极,相邻两个内凸极之间形成一个内弧形槽,每个内弧形槽内布设一个内瓦片式永磁体,每个内瓦片式永磁体均为高能量密度永磁体;(2) p arc-shaped inner salient poles are evenly distributed on the inner surface of each rotor core segment along the circumferential direction, and an inner arc-shaped slot is formed between two adjacent inner salient poles, and each inner arc-shaped slot is An inner tile-type permanent magnet is arranged, and each inner tile-type permanent magnet is a permanent magnet with high energy density; 交替极永磁电机转子无论作为内转子,还是作为外转子,均还具有如下布设方式:The alternating pole permanent magnet motor rotor also has the following layouts, whether it is used as an inner rotor or an outer rotor: 相邻两个转子铁心段上的外瓦片式永磁体或内瓦片式永磁体沿周向偏移的电周期角度为360°/2p;The electrical period angle at which the outer tile-type permanent magnets or the inner tile-type permanent magnets on the two adjacent rotor core segments are offset in the circumferential direction is 360°/2p; 位于同一个转子铁心段上的所有外瓦片式永磁体的充磁方向一致,位于同一个转子铁心段上的所有内瓦片式永磁体的充磁方向一致,位于同一个转子铁心段上的外瓦片式永磁体和内瓦片式永磁体的充磁方向相反;The magnetization directions of all the outer tile permanent magnets located on the same rotor core segment are the same, and the magnetization directions of all inner tile permanent magnets located on the same rotor core segment are the same. The magnetization directions of the outer tile-type permanent magnet and the inner tile-type permanent magnet are opposite; 相邻两个转子铁心段上的外瓦片式永磁体的充磁方向相反;相邻两个转子铁心段上的内瓦片式永磁体的充磁方向相反。The magnetization directions of the outer tile-type permanent magnets on the two adjacent rotor core segments are opposite; the magnetization directions of the inner tile-type permanent magnets on the two adjacent rotor core segments are opposite. 2.根据权利要求1所述的采用混合永磁体的交替极永磁电机转子,其特征在于:每个外瓦片式永磁体和每个内瓦片式永磁体的两侧均设置有隔磁槽。2. The alternating pole permanent magnet motor rotor adopting hybrid permanent magnets according to claim 1, is characterized in that: both sides of each outer tile type permanent magnet and each inner tile type permanent magnet are provided with magnetic isolation groove. 3.根据权利要求2所述的采用混合永磁体的交替极永磁电机转子,其特征在于:高能量密度永磁体两侧的隔磁槽的系数其中θb1为高能量密度永磁体两侧的隔磁槽的圆心角,θm1为高能量密度永磁体的圆心角;kc1取值范围为0-0.2。3. The alternating pole permanent magnet motor rotor adopting the hybrid permanent magnet according to claim 2, is characterized in that: the coefficient of the magnetic isolation slot on both sides of the high energy density permanent magnet Wherein θ b1 is the central angle of the magnetic isolation slot on both sides of the high energy density permanent magnet, θ m1 is the central angle of the high energy density permanent magnet; the value range of k c1 is 0-0.2. 4.根据权利要求2所述的采用混合永磁体的交替极永磁电机转子,其特征在于:低能量密度永磁体两侧的隔磁槽的系数其中θb2为低能量密度永磁体两侧的隔磁槽的圆心角,θm2为低能量密度永磁体的圆心角,kc2取值范围在0-0.2之间。4. The alternating pole permanent magnet motor rotor using hybrid permanent magnets according to claim 2 is characterized in that: the coefficient of the magnetic isolation slots on both sides of the low energy density permanent magnets Wherein θ b2 is the central angle of the magnetic isolation slot on both sides of the low energy density permanent magnet, θ m2 is the central angle of the low energy density permanent magnet, and k c2 ranges from 0 to 0.2. 5.根据权利要求1所述的采用混合永磁体的交替极永磁电机转子,其特征在于:导磁环的外周或内周同轴套设有轴向充磁永磁体;假设轴向充磁永磁体的外径为r1,高能量密度永磁体的外径为r3,高能量密度永磁体的内径为r4,则r3≤r1≤r4。5. The alternating pole permanent magnet motor rotor adopting hybrid permanent magnets according to claim 1, is characterized in that: the outer circumference or inner circumference of the magnetic conducting ring is coaxially sleeved with axially magnetized permanent magnets; The outer diameter of the permanent magnet is r1, the outer diameter of the high energy density permanent magnet is r3, and the inner diameter of the high energy density permanent magnet is r4, then r3≤r1≤r4. 6.根据权利要求5所述的采用混合永磁体的交替极永磁电机转子,其特征在于:位于同一个转子铁心段两侧的两个轴向充磁永磁体的充磁方向相反。6 . The alternating-pole permanent magnet motor rotor using hybrid permanent magnets according to claim 5 , wherein the magnetization directions of the two axially magnetized permanent magnets located on both sides of the same rotor core segment are opposite. 7 . 7.根据权利要求1所述的采用混合永磁体的交替极永磁电机转子,其特征在于:导磁环的轴向长度系数其中La为导磁环的轴向长度,Lef为电机整机的有效轴向长度;ka取值范围为0-0.1。7. The alternating-pole permanent magnet motor rotor using hybrid permanent magnets according to claim 1, characterized in that: the axial length coefficient of the magnetically permeable ring Wherein L a is the axial length of the magnetic permeable ring, L ef is the effective axial length of the whole motor; the value range of ka is 0-0.1. 8.根据权利要求1所述的采用混合永磁体的交替极永磁电机转子,其特征在于:高能量密度永磁体的极弧系数αp1=θm1p/(2π),其中θm1为高能量密度永磁体的圆心角,αp1取值范围为0.35-0.75。8. The alternating pole permanent magnet motor rotor using hybrid permanent magnets according to claim 1, characterized in that: the pole arc coefficient α p1m1 p/(2π) of the high energy density permanent magnets, wherein θ m1 is high The central angle of the energy density permanent magnet, α p1 ranges from 0.35 to 0.75. 9.根据权利要求1所述的采用混合永磁体的交替极永磁电机转子,其特征在于:低能量密度永磁体的极弧系数αp2=θm2n/(2π),其中n为低能量密度永磁体槽的个数,θm2为低能量密度永磁体的圆心角,αp2取值范围为0.7-0.99。9 . The alternating pole permanent magnet motor rotor using hybrid permanent magnets according to claim 1 , wherein: the pole arc coefficient α p2m2 n/(2π) of the low energy density permanent magnets, wherein n is low energy The number of density permanent magnet slots, θ m2 is the central angle of the low energy density permanent magnet, and the value range of α p2 is 0.7-0.99. 10.根据权利要求1所述的采用混合永磁体的交替极永磁电机转子,其特征在于:高能量密度永磁体为钕铁硼,低能量密度永磁体为铁氧体。10 . The alternating pole permanent magnet motor rotor using hybrid permanent magnets according to claim 1 , wherein the high energy density permanent magnets are NdFeB and the low energy density permanent magnets are ferrites. 11 .
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