CN219351384U - Halbach permanent magnet synchronous motor rotor with few rare earth combined magnetic poles - Google Patents

Halbach permanent magnet synchronous motor rotor with few rare earth combined magnetic poles Download PDF

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CN219351384U
CN219351384U CN202320107685.4U CN202320107685U CN219351384U CN 219351384 U CN219351384 U CN 219351384U CN 202320107685 U CN202320107685 U CN 202320107685U CN 219351384 U CN219351384 U CN 219351384U
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permanent magnet
rare earth
magnets
synchronous motor
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李春艳
初秋
孟涛
李宗耀
车爽
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Heilongjiang University
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Abstract

A Halbach permanent magnet synchronous motor rotor with few rare earth combined magnetic poles relates to the technical field of motors. The utility model aims to solve the problem that the existing rare earth permanent magnet synchronous motor is large in rare earth permanent magnet material consumption. Each pole permanent magnet comprises m main magnets and 2n auxiliary magnets, n auxiliary magnets are respectively arranged on two sides of the m main magnets in the circumferential direction, each main magnet comprises a non-rare-earth material layer and a rare-earth neodymium-iron-boron layer which are sequentially arranged from inside to outside along the radial direction, and the auxiliary magnets and the non-rare-earth material layers are all non-rare-earth ferrite. The rare earth permanent magnet material has small dosage, and can effectively get rid of excessive dependence on the rare earth permanent magnet material. The motor magnetic flux density is low, the motor iron loss can be reduced, and the motor operation efficiency is high. The rotating speed regulating range of the surface-mounted permanent magnet synchronous motor can be widened.

Description

一种少稀土组合磁极的Halbach永磁同步电机转子A Halbach Permanent Magnet Synchronous Motor Rotor with Fewer Rare Earth Combined Pole

技术领域technical field

本实用新型属于电机技术领域。The utility model belongs to the technical field of motors.

背景技术Background technique

稀土永磁同步电机具有功率密度高、效率高、结构简单和易于调速等优点,被广泛应用在各个行业。但是,稀土永磁材料是一种不可再生的资源,随着产业的发展对稀土产品提出更大需求,加剧看稀土永磁材料的供需缺口。近年来稀土永磁材料价格大幅增长导致稀土永磁同步电机的制造成本随之增加,其中稀土永磁体成本将占稀土永磁电机总成本的20%。图1给出了两种现有稀土永磁同步电机的结构,该结构的电机转矩性能好,但是稀土永磁体用量大,电机制造成本高。Rare earth permanent magnet synchronous motors have the advantages of high power density, high efficiency, simple structure and easy speed regulation, and are widely used in various industries. However, rare earth permanent magnet materials are non-renewable resources. With the development of the industry, there is a greater demand for rare earth products, which intensifies the gap between supply and demand of rare earth permanent magnet materials. In recent years, the sharp increase in the price of rare earth permanent magnet materials has led to an increase in the manufacturing cost of rare earth permanent magnet synchronous motors, of which the cost of rare earth permanent magnets will account for 20% of the total cost of rare earth permanent magnet motors. Figure 1 shows two existing structures of rare earth permanent magnet synchronous motors. The motor torque performance of this structure is good, but the amount of rare earth permanent magnets is large, and the manufacturing cost of the motor is high.

实用新型内容Utility model content

本实用新型是为了解决现有的稀土永磁同步电机稀土永磁材料用量大的问题,现提供一种能够充分发挥永磁同步电机高转矩密度优势的少稀土组合磁极的Halbach永磁同步电机转子。The utility model is to solve the problem that the existing rare earth permanent magnet synchronous motor has a large amount of rare earth permanent magnet materials, and now provides a Halbach permanent magnet synchronous motor with less rare earth combined magnetic poles that can give full play to the advantages of the high torque density of the permanent magnet synchronous motor rotor.

一种少稀土组合磁极的Halbach永磁同步电机转子,包括永磁体和转子铁芯,所述永磁体呈Halbach阵列结构设置在转子铁芯的外圆周面,每一极永磁体均包括m块主磁体和2n块辅助磁体,其中,m和n均为正整数,所述m块主磁体的周向两侧各设有n块辅助磁体,每块主磁体均包括沿径向由内向外依次排布的非稀土材料层和稀土钕铁硼层,所述辅助磁体和非稀土材料层均为非稀土铁氧体,同一极中m块主磁体的充磁方向相同、且均与m块主磁体整体的径向中线平行,相邻两极中主磁体的充磁方向相反,A Halbach permanent magnet synchronous motor rotor with few rare earth combined magnetic poles, including permanent magnets and rotor iron cores, the permanent magnets are arranged on the outer circumference of the rotor iron core in a Halbach array structure, and each pole permanent magnet includes m pieces of main magnets. magnets and 2n auxiliary magnets, wherein m and n are both positive integers, n auxiliary magnets are provided on both sides of the m main magnets in the circumferential direction, and each main magnet includes non-rare earth material layer and rare earth NdFeB layer, the auxiliary magnet and the non-rare earth material layer are non-rare earth ferrite, the magnetization direction of the m main magnets in the same pole is the same, and they are all the same as the m main magnets The overall radial center line is parallel, and the magnetization directions of the main magnets in adjacent two poles are opposite.

以任意一极中m块主磁体整体的径向中线为基准线、且该m块主磁体的充磁方向背向转子铁芯的圆心时,则第i块辅助磁体的充磁角度

Figure SMS_1
满足下式:When the radial centerline of the m main magnets in any pole is taken as the reference line, and the magnetization direction of the m main magnets faces away from the center of the rotor core, the magnetization angle of the i-th auxiliary magnet
Figure SMS_1
Satisfies the following formula:

Figure SMS_2
Figure SMS_2

以任意一极中m块主磁体整体的径向中线为基准线、且该m块主磁极的充磁方向朝向转子铁芯的圆心时,则第i块辅助磁体的充磁角度

Figure SMS_3
满足下式:When the radial centerline of the m main magnets in any one pole is taken as the reference line, and the magnetization direction of the m main magnetic poles faces the center of the rotor core, then the magnetization angle of the i-th auxiliary magnet
Figure SMS_3
Satisfies the following formula:

Figure SMS_4
Figure SMS_4

其中,p=2为电机极对数,i=1,2,...,4pn,3≤m+2n≤6,θi为第i块辅助磁体径向中线与基准线的夹角,所述充磁角度

Figure SMS_5
为第i块辅助磁体充磁方向与基准线的夹角,且位于基准线顺时针方向的夹角角度为负值,位于基准线逆时针方向的夹角角度为正值。Among them, p=2 is the number of pole pairs of the motor, i=1,2,...,4pn, 3≤m+2n≤6, θi is the angle between the radial centerline of the i-th auxiliary magnet and the reference line, so Magnetization Angle
Figure SMS_5
is the angle between the magnetization direction of the i-th auxiliary magnet and the reference line, and the included angle in the clockwise direction of the reference line is a negative value, and the included angle in the counterclockwise direction of the reference line is a positive value.

进一步的,上述每一极中m块主磁体的整体弧长与每一块辅助磁体的弧长相等;Further, the overall arc length of the m main magnets in each pole is equal to the arc length of each auxiliary magnet;

或者,上述每一极中m块主磁体的整体弧长大于每一块辅助磁体的弧长;Or, the overall arc length of the m main magnets in each pole is greater than the arc length of each auxiliary magnet;

或者,上述每一极中m块主磁体的整体弧长小于每一块辅助磁体的弧长。Alternatively, the overall arc length of the m main magnets in each pole is smaller than the arc length of each auxiliary magnet.

进一步的,上述稀土钕铁硼层包括径向排布的外层弧和内层弧,所述外层弧的弧长大于内层弧的弧长。Further, the above-mentioned rare earth NdFeB layer includes radially arranged outer arcs and inner arcs, and the arc length of the outer arcs is longer than that of the inner arcs.

本实用新型中组合磁极采用非稀土和稀土两种永磁材料,相对非稀土永磁同步电机来说更有利于提高电机的转矩密度,同时Halbach阵列能够提高气隙磁通密度,将两者的优势结合起来,能够有效提高电机的电磁转矩。本实用新型相对于现有技术能够实现以下四个方面的技术改善:In the utility model, the combined magnetic pole adopts non-rare earth and rare earth permanent magnet materials, which is more conducive to improving the torque density of the motor compared with the non-rare earth permanent magnet synchronous motor. At the same time, the Halbach array can increase the air gap magnetic flux density, combining the two The combination of advantages can effectively improve the electromagnetic torque of the motor. Compared with the prior art, the utility model can realize technical improvements in the following four aspects:

(1)稀土永磁材料用量少,能够有效摆脱对稀土永磁材料的过度依赖。(1) The amount of rare earth permanent magnet materials is small, which can effectively get rid of the excessive dependence on rare earth permanent magnet materials.

(2)借助聚磁的Halbach结构以及组合磁极提高电磁转矩,电机电磁转矩性能较好。(2) With the help of the Halbach structure of magnetic concentration and the combination of magnetic poles, the electromagnetic torque is improved, and the electromagnetic torque performance of the motor is better.

(3)相对于现有稀土永磁同步电机,采用本实用新型转子的电机磁通密度低,能够减少电机铁损,电机的运行效率高,充分发挥永磁同步电机高效率的优势。(3) Compared with the existing rare earth permanent magnet synchronous motor, the motor adopting the rotor of the utility model has a low magnetic flux density, can reduce the iron loss of the motor, has high operating efficiency of the motor, and fully exerts the advantages of high efficiency of the permanent magnet synchronous motor.

(4)相对于现有表贴式永磁同步电机,采用本实用新型转子的电机永磁磁链低,能够拓宽表贴式永磁同步电机的转速调速范围。(4) Compared with the existing surface-mounted permanent magnet synchronous motor, the permanent magnet flux linkage of the motor adopting the rotor of the utility model is low, which can widen the speed regulation range of the surface-mounted permanent magnet synchronous motor.

附图说明Description of drawings

图1为两种传统结构的稀土永磁同步电机转子结构示意图,其中,(a)为表贴式稀土永磁同步电机,(b)为稀土Halbach永磁同步电机;Figure 1 is a schematic diagram of the rotor structure of two traditional rare earth permanent magnet synchronous motors, wherein (a) is a surface-mounted rare earth permanent magnet synchronous motor, and (b) is a rare earth Halbach permanent magnet synchronous motor;

图2为一种少稀土组合磁极的Halbach永磁同步电机的结构示意图;Fig. 2 is the structural representation of the Halbach permanent magnet synchronous motor of a kind of rare earth combined magnetic pole;

图3为一种少稀土组合磁极的Halbach永磁同步电机转子的结构示意图;Fig. 3 is the structural representation of the Halbach permanent magnet synchronous motor rotor of a kind of few rare earth combined magnetic pole;

图4为辅助磁体的充磁角度示意图,其中,(a)表示以基准线的充磁方向朝向转子铁芯的圆心,(b)表示以基准线的充磁方向背向转子铁芯的圆心;Fig. 4 is a schematic diagram of the magnetization angle of the auxiliary magnet, wherein (a) indicates that the magnetization direction of the reference line is towards the center of the rotor core, and (b) indicates that the magnetization direction of the reference line is facing away from the center of the rotor core;

图5为m=2,n=1时,少稀土组合磁极的Halbach永磁同步电机转子的结构示意图;Fig. 5 is m=2, when n=1, the structural representation of the rotor of the Halbach permanent magnet synchronous motor with few rare earth combined magnetic poles;

图6为m=1,n=2时,少稀土组合磁极的Halbach永磁同步电机转子的结构示意图;Fig. 6 is m=1, when n=2, the structural representation of the rotor of the Halbach permanent magnet synchronous motor with few rare earth combined magnetic poles;

图7为主磁体和辅助磁体径向厚度不等的转子结构示意图,其中,(a)表示主磁体厚度大于辅助磁体厚度,(b)表示主磁体厚度小于辅助磁体厚度;Fig. 7 is a schematic diagram of the rotor structure with different radial thicknesses of the main magnet and the auxiliary magnet, wherein (a) indicates that the thickness of the main magnet is greater than that of the auxiliary magnet, and (b) indicates that the thickness of the main magnet is smaller than that of the auxiliary magnet;

图8为含有T形主磁体的转子结构示意图。Fig. 8 is a structural schematic diagram of a rotor containing a T-shaped main magnet.

稀土钕铁硼层1、辅助磁体2、非稀土材料层3、转子铁芯4、转轴5、定子6、绕组7。Rare earth NdFeB layer 1, auxiliary magnet 2, non-rare earth material layer 3, rotor core 4, rotating shaft 5, stator 6, winding 7.

具体实施方式Detailed ways

下面将结合本实用新型实施例中的附图,对本实用新型实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本实用新型一部分实施例,而不是全部的实施例。基于本实用新型中的实施例,本领域普通技术人员在没有作出创造性劳动的前提下所获得的所有其它实施例,都属于本实用新型保护的范围。需要说明的是,在不冲突的情况下,本实用新型中的实施例及实施例中的特征可以相互组合。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

具体实施方式一:参照图2至图4具体说明本实施方式,本实施方式所述的一种少稀土组合磁极的Halbach永磁同步电机转子,包括永磁体和转子铁芯4,所述永磁体呈Halbach阵列结构设置在转子铁芯4外圆周面。Specific Embodiment 1: This embodiment is described in detail with reference to FIGS. 2 to 4. A Halbach permanent magnet synchronous motor rotor with rare earth combined magnetic poles described in this embodiment includes a permanent magnet and a rotor core 4. The permanent magnet It is arranged on the outer circumferential surface of the rotor core 4 in a Halbach array structure.

如图2和3所示,本实施方式中转子极对数为2,每一极永磁体均包括1块主磁体和2块辅助磁体2,2块辅助磁体2分别位于主磁体的周向两侧。每一极中的主磁体均包括沿径向由内向外依次排布的非稀土材料层3和稀土钕铁硼层1。所述辅助磁体2和非稀土材料层3均为非稀土铁氧体。As shown in Figures 2 and 3, the number of pole pairs of the rotor in this embodiment is 2, and each pole permanent magnet includes 1 main magnet and 2 auxiliary magnets 2, and the 2 auxiliary magnets 2 are respectively located on the two circumferential sides of the main magnet. side. The main magnet in each pole includes a non-rare earth material layer 3 and a rare earth NdFeB layer 1 sequentially arranged radially from inside to outside. Both the auxiliary magnet 2 and the non-rare earth material layer 3 are non-rare earth ferrite.

主磁体的充磁方向与主磁体的径向中线平行,相邻两极中主磁体的充磁方向相反。The magnetization direction of the main magnet is parallel to the radial center line of the main magnet, and the magnetization direction of the main magnet in two adjacent poles is opposite.

如图4(a)所示,以任意一极中主磁体的径向中线为基准线、且该主磁体的充磁方向朝向转子铁芯4的圆心时,则第i块辅助磁体2的充磁角度

Figure SMS_6
满足下式:As shown in Figure 4(a), when the radial centerline of the main magnet in any pole is taken as the reference line, and the magnetization direction of the main magnet is toward the center of the rotor core 4, the charge of the ith auxiliary magnet 2 magnetic angle
Figure SMS_6
Satisfies the following formula:

Figure SMS_7
Figure SMS_7

如图4(b)所示,以任意一极中主磁体的径向中线为基准线、且该主磁体的充磁方向背向转子铁芯4的圆心时,则第i块辅助磁体2的充磁角度

Figure SMS_8
满足下式:As shown in Figure 4(b), when taking the radial midline of the main magnet in any pole as the reference line and the magnetization direction of the main magnet facing away from the center of the rotor core 4, the i-th auxiliary magnet 2 Magnetization angle
Figure SMS_8
Satisfies the following formula:

Figure SMS_9
Figure SMS_9

其中,p=2为电机极对数,i=1,2,...,8,θi为第i块辅助磁体2径向中线与基准线的夹角,所述充磁角度

Figure SMS_10
为第i块辅助磁体2充磁方向与基准线的夹角,且位于基准线顺时针方向的夹角角度为负值,位于基准线逆时针方向的夹角角度为正值。Wherein, p=2 is the number of pole pairs of the motor, i=1,2,...,8, θ i is the angle between the radial center line of the i-th auxiliary magnet 2 and the reference line, and the magnetization angle
Figure SMS_10
is the angle between the magnetization direction of the i-th auxiliary magnet 2 and the reference line, and the included angle in the clockwise direction of the reference line is a negative value, and the included angle in the counterclockwise direction of the reference line is a positive value.

具体实施方式二:参照图5具体说明本实施方式,本实施方式与具体实施方式一所述的一种少稀土组合磁极的Halbach永磁同步电机转子的区别在于,本实施方式中,每一极永磁体均包括2块主磁体和2块辅助磁体2。Specific embodiment two: this embodiment is described in detail with reference to Fig. 5, the difference between this embodiment and the Halbach permanent magnet synchronous motor rotor of a kind of rare earth combined magnetic pole described in specific embodiment one is that in this embodiment, each pole The permanent magnets each include 2 main magnets and 2 auxiliary magnets 2 .

永磁体块数增加有利于提高电机的电磁转矩。The increase in the number of permanent magnet blocks is beneficial to improve the electromagnetic torque of the motor.

具体实施方式三:参照图6具体说明本实施方式,本实施方式与具体实施方式一所述的一种少稀土组合磁极的Halbach永磁同步电机转子的区别在于,本实施方式中,每一极永磁体均包括1块主磁体和4块辅助磁体2。Specific embodiment three: this embodiment is described in detail with reference to Fig. 6, the difference between this embodiment and the Halbach permanent magnet synchronous motor rotor of a kind of rare earth combined magnetic pole described in specific embodiment one is that in this embodiment, each pole The permanent magnets all include 1 main magnet and 4 auxiliary magnets 2 .

永磁体块数增加有利于提高电机的电磁转矩。The increase in the number of permanent magnet blocks is beneficial to improve the electromagnetic torque of the motor.

具体实施方式四:参照图7具体说明本实施方式,本实施方式是对具体实施方式一所述的一种少稀土组合磁极的Halbach永磁同步电机转子的进一步说明,本实施方式中,主磁体和辅助磁体2在径向方向厚度不同,即:主磁体的径向厚度大于或小于辅助磁体2的径向厚度。Specific embodiment four: this embodiment is specifically described with reference to Fig. 7, and this embodiment is the further description of the Halbach permanent magnet synchronous motor rotor of a kind of few rare earth combined magnetic pole described in specific embodiment one, and in this embodiment, the main magnet It is different from the thickness of the auxiliary magnet 2 in the radial direction, that is, the radial thickness of the main magnet is greater than or smaller than the radial thickness of the auxiliary magnet 2 .

本实施方式中,不等厚组合的磁极能够减小非稀土永磁体的用量,进一步减轻转子的质量,有利于降低电机的成本。同时,不等厚组合磁极Halbach阵列更有利于调整气隙磁通密度波形的正弦度,有利于降低转矩波动。In this embodiment, the magnetic poles combined with unequal thickness can reduce the amount of non-rare earth permanent magnets, further reduce the mass of the rotor, and help reduce the cost of the motor. At the same time, the unequal-thickness combined magnetic pole Halbach array is more conducive to adjusting the sine degree of the air-gap magnetic flux density waveform and is conducive to reducing torque ripple.

具体实施方式五:本实施方式是对具体实施方式一所述的一种少稀土组合磁极的Halbach永磁同步电机转子的进一步说明,本实施方式中,每一极中主磁体的整体弧长与每一块辅助磁体2的弧长相等或不等,当不等时,每一极中m块主磁体的整体弧长大于或小于每一块辅助磁体2的弧长。Specific embodiment five: this embodiment is a further description of the Halbach permanent magnet synchronous motor rotor of a kind of rare earth combined magnetic pole described in specific embodiment one. In this embodiment, the overall arc length and arc length of the main magnet in each pole are The arc lengths of each auxiliary magnet 2 are equal or different, and when they are not equal, the overall arc length of the m main magnets in each pole is greater than or smaller than the arc length of each auxiliary magnet 2 .

本实施方式中,主磁体的宽度和辅助磁体2的弧长(宽度)不同,使得设计更为灵活,根据气隙磁通密度设计目标调整达到稀土永磁同步电机转矩所需要的永磁体的宽度。主磁体的宽度越大,越有利于提高电机的电磁转矩,同时也会增加稀土永磁体用量提高电机的成本。In this embodiment, the width of the main magnet is different from the arc length (width) of the auxiliary magnet 2, so that the design is more flexible. According to the design target of the air gap magnetic flux density, the ratio of the permanent magnet required for the torque of the rare earth permanent magnet synchronous motor can be adjusted. width. The larger the width of the main magnet, the more beneficial it is to improve the electromagnetic torque of the motor, and at the same time it will also increase the amount of rare earth permanent magnets and increase the cost of the motor.

具体实施方式五:参照图8具体说明本实施方式,本实施方式是对具体实施方式一所述的一种少稀土组合磁极的Halbach永磁同步电机转子的进一步说明,本实施方式中,稀土钕铁硼层1的形状近似于“T”形,具体的,稀土钕铁硼层1包括径向排布的外层弧和内层弧,所述外层弧的弧长大于内层弧的弧长。Specific embodiment five: this embodiment is specifically described with reference to Fig. 8, and this embodiment is the further explanation to the Halbach permanent magnet synchronous motor rotor of a kind of few rare earth combined magnetic pole described in specific embodiment one, in this embodiment, rare earth neodymium The shape of the iron-boron layer 1 is similar to a "T" shape. Specifically, the rare earth NdFeB layer 1 includes radially arranged outer arcs and inner arcs, and the arc length of the outer arc is longer than that of the inner arc. long.

本实施方式中,稀土钕铁硼层1的径向中心线位置电机的永磁体提供的磁通最多,T形稀土钕铁硼层1部分展开至辅助磁体对应的该部分径向位置电机的永磁体提供的磁通次之,T形延展部分的径向位置电机永磁体提供的磁通最少。有利于气隙磁通密度波形的正弦分布,降低转矩波动。In this embodiment, the permanent magnet of the motor at the radial centerline position of the rare earth NdFeB layer 1 provides the most magnetic flux, and the T-shaped rare earth NdFeB layer 1 part expands to the permanent magnet at the radial position corresponding to the auxiliary magnet. The magnetic flux provided by the magnet is next, and the radial position of the T-shaped extension part provides the least magnetic flux by the permanent magnet of the motor. It is beneficial to the sinusoidal distribution of the air gap magnetic flux density waveform and reduces torque ripple.

由于钕铁硼比较脆,太薄容易碎,同时稀土永磁同步电机永磁体厚度薄了转矩性能下降很快,因此稀土Halbach电机如果从厚度上减小稀土材料永磁体用料的程度十分有限。所以依靠减小稀土永磁的一点点厚度,是非常有限的。而本实用新型采用铁氧体在组合磁极中,稀土永磁体和普通稀土永磁同步电机中的稀土永磁体厚度虽然相差不大,但是宽度却远远小于普通稀土永磁同步电机,能够明显的降低稀土材料的用量。Because NdFeB is relatively brittle, too thin and easy to break, and the thickness of the permanent magnet of the rare earth permanent magnet synchronous motor is thin, the torque performance drops rapidly. Therefore, if the rare earth Halbach motor reduces the thickness of the rare earth material permanent magnet, the degree of material used is very limited. . Therefore, it is very limited to rely on reducing the thickness of the rare earth permanent magnet a little bit. And the utility model adopts ferrite in the combined magnetic pole, although the thickness of the rare earth permanent magnet and the rare earth permanent magnet in the common rare earth permanent magnet synchronous motor have little difference, the width is far smaller than the common rare earth permanent magnet synchronous motor, which can obviously Reduce the amount of rare earth materials used.

如果是内置永磁体的结构,在弱磁控制上永磁体的退磁问题就比较突出。由于本实施方式是属于表贴式的范畴,直交轴电感相等,采用id=0控制,没有去磁电流,这种情况下,性能低下容易去磁的铁氧体的弱势就不明显了。因为不需要弱磁,所以退磁问题就不突出。If it is a structure with a built-in permanent magnet, the problem of demagnetization of the permanent magnet is more prominent in the field weakening control. Since this embodiment belongs to the category of surface-mounted type, the orthogonal axis inductance is equal, and the id=0 control is adopted, and there is no demagnetization current. In this case, the disadvantage of ferrite with low performance and easy demagnetization is not obvious. Because there is no need for field weakening, the problem of demagnetization is not prominent.

综上所述,现有的稀土Halbach,都集中在电机的电磁转矩性能提升上,倾向于用大量的磁性能更好的钕铁硼材料。而本实用新型能够在降低稀土材料用量的同时提高电磁转矩,具有良好的应用前景。To sum up, the existing rare earth Halbach focuses on improving the electromagnetic torque performance of the motor, and tends to use a large amount of NdFeB materials with better magnetic properties. However, the utility model can increase the electromagnetic torque while reducing the amount of rare earth materials, and has good application prospects.

虽然在本文中参照了特定的实施方式来描述本实用新型,但是应该理解的是,这些实施例仅仅是本实用新型的原理和应用的示例。因此应该理解的是,可以对示例性的实施例进行许多修改,并且可以设计出其他的布置,只要不偏离所附权利要求所限定的本实用新型的精神和范围。应该理解的是,可以通过不同于原始权利要求所描述的方式来结合不同的从属权利要求和本文中所述的特征。还可以理解的是,结合单独实施例所描述的特征可以使用在其它所述实施例中。Although the invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It is therefore to be understood that numerous modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the invention as defined by the appended claims. It shall be understood that different dependent claims and features described herein may be combined in a different way than that described in the original claims. It will also be appreciated that features described in connection with individual embodiments can be used in other described embodiments.

Claims (5)

1. A Halbach permanent magnet synchronous motor rotor with few rare earth combined magnetic poles comprises a permanent magnet and a rotor core (4), wherein the permanent magnet is arranged on the outer circumferential surface of the rotor core (4) in a Halbach array structure,
it is characterized in that each pole permanent magnet comprises m main magnets and 2n auxiliary magnets (2), wherein m and n are positive integers, n auxiliary magnets (2) are respectively arranged on two sides of the circumference of the m main magnets, each main magnet comprises a non-rare-earth material layer (3) and a rare-earth neodymium-iron-boron layer (1) which are sequentially arranged from inside to outside along the radial direction, the auxiliary magnets (2) and the non-rare-earth material layers (3) are non-rare-earth ferrite,
the magnetizing directions of the m main magnets in the same pole are the same and are parallel to the radial central line of the whole m main magnets, the magnetizing directions of the main magnets in the adjacent two poles are opposite,
when the radial central line of the whole m main magnets in any pole is taken as a datum line and the magnetizing direction of the m main magnets is away from the circle center of the rotor core (4), the magnetizing angle theta of the ith auxiliary magnet (2) i * Satisfies the following formula:
Figure QLYQS_1
when the radial central line of the whole m main magnets in any pole is taken as a datum line and the magnetizing direction of the m main magnetic poles faces the circle center of the rotor core (4), the magnetizing angle theta of the ith auxiliary magnet (2) i * Satisfies the following formula:
Figure QLYQS_2
wherein the method comprises the steps ofP=2 is the pole pair number of the motor, i=1, 2,..4 pn, 3.ltoreq.m+2n.ltoreq.6, θ i Is the included angle between the radial center line of the ith auxiliary magnet (2) and the datum line, and the magnetizing angle theta i * The included angle between the magnetizing direction of the ith auxiliary magnet (2) and the datum line is negative, and the included angle between the magnetizing direction and the datum line in the clockwise direction is positive.
2. Halbach permanent magnet synchronous motor rotor with few rare earth combined poles according to claim 1, characterized in that the overall arc length of m main magnets in each pole is equal to the arc length of each auxiliary magnet (2).
3. Halbach permanent magnet synchronous motor rotor with few rare earth combined poles according to claim 1, characterized in that the overall arc length of m main magnets in each pole is larger than the arc length of each auxiliary magnet (2).
4. Halbach permanent magnet synchronous motor rotor with few rare earth combined poles according to claim 1, characterized in that the overall arc length of m main magnets in each pole is smaller than the arc length of each auxiliary magnet (2).
5. A Halbach permanent magnet synchronous motor rotor with few rare earth combined magnetic poles according to claim 1, characterized in that the rare earth neodymium iron boron layer (1) comprises an outer layer arc and an inner layer arc which are radially arranged, wherein the arc length of the outer layer arc is larger than that of the inner layer arc.
CN202320107685.4U 2023-02-03 2023-02-03 Halbach permanent magnet synchronous motor rotor with few rare earth combined magnetic poles Active CN219351384U (en)

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