CN104620003A - 磁力轴承和用于在磁力轴承的芯周围安装铁磁结构的方法 - Google Patents
磁力轴承和用于在磁力轴承的芯周围安装铁磁结构的方法 Download PDFInfo
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Abstract
一种磁力轴承,设置有径向致动器部分和轴向致动器部分,上述径向致动器部分包括设置有定子磁轭(3)的叠片定子叠层组(2),其特征在于,定子磁轭(3)与围绕定子磁轭(3)的闭合铁磁结构(9)相联。
Description
技术领域
本发明涉及用于使机器旋转的磁力轴承,这种轴承具有集成式径向-轴向结构,轴向控制磁通量穿过软磁芯的中心开口。
磁力轴承提供无接触式悬撑。其摩擦损耗小,因而在高速应用场合,这种磁力轴承很受欢迎。但是,由于转子动力的限制,高速旋转机器的结构通常很复杂。在这个意义上看,轴向长度的任何减少均造成转子动力达到极限值。在"组合式轴承"中最大限度地应用了这种性质,这种轴承结构中,将轴向通道和径向通道集成到紧凑结构中,从而可共享各种功能部件。
背景技术
在专利和科技文献中均可以找到组合式轴承的各种例子。通常,轴向控制磁通量的路径经过铁磁材料叠片叠层组的中心开口。在下列专利或专利申请中可以找到例子:US5.514.924,US6.268.674,US6.727.617,WO2008/074045,CN1.737.388。在科技文献如Imoberdorf等、Pichot等以及Buckner等撰写的文章中可以找到其它例子。在Blumenstock的美国专利US6359357B1描述的组合式轴承中,轴向控制磁通量不经过铁磁材料叠片叠层组的中心开口。
如果轴向控制磁通量的路径经过材料叠片叠层组的中心开口,或具体而言,如果在组合式轴承包含的某区域导电路径包围控制磁通量,那么组合式轴承的轴向通道性能会受到不利影响。在这种情况下,改变控制磁通量会在周围材料中感应出电压。如果周围路径是闭合的且导电的,那么该感应电压会产生循环电流,从而会产生焦耳损耗。实际上,这种材料叠片叠层组可被认为是变压器的次级短路线圈,其中轴向控制线圈是初级线圈。这种结果取决于频率:原则上,损耗随着频率增加而增加。对于某一轴向控制电流和频率,焦耳损耗会减小所产生的作用力。因此,轴向通道的性能会受到影响。
如果轴向致动器作用在材料叠片叠层组上,那么类似现象也会出现在这种材料叠片叠层组上。在这种情况下,控制磁通量进入叠层组本身中,但物理解释是相同的。在美国专利号US6268674中,Takahashi提出在材料叠片叠层组中形成一系列均匀分布的径向切口。显然,为了保持足够的强度,不能在薄片的整个厚度上进行切割。这样,如果控制磁通量仅进入切口区域,那么仍会局部产生感应电流。这种技术仅仅提供了一种解决办法来减小相关材料叠片叠层组中的损耗。整个控制磁通量仍然一直被另外的定子叠层组包围。
国际专利申请WO2011/054065描述了一种用于消除由轴向控制磁场在定子叠层组中感应的涡流的方法。其通过贯穿叠层组的各个薄片形成切口,然后堆叠薄片使得叠层组内的磁场磁阻被影响至最小而实现。这种方法的缺陷在于,由径向控制线圈引起的叠层的磁场磁阻会增大。另外,众所周知,薄片之间的涂层不是完全绝缘,组件的部分也可能导致薄片之间相互接触,所以仍然会观察到循环电流。因此,用于衰减涡流的附加手段可以进一步改善性能。
发明内容
本发明的目的是提供一种选择方式来降低涡流引起的损耗。
为此,本发明涉及一种磁力轴承,其设置有径向致动器部分和轴向致动器部分,所述径向致动器部分设置有具有定子磁轭的叠片定子叠层组,以及定子磁轭与围绕定子磁轭的闭合铁磁结构相联接。
附图说明
为了更透彻地显示本发明的特征,下文参照附图通过非限制性的实例来描述依照本发明的磁力轴承的一些优选实施例,其中:
图1-3显示了已知组合式轴承的纵向截面;
图4和5显示了已知组合式轴承的径向截面;
图6示意地显示了依照本发明的磁力轴承的一部分的透视图,该部分用于产生径向力;
图7显示了沿图6中线VII-VII剖取的截面;
图10、13和14显示了依照图7的材料叠片叠层组的磁轭的各种实施例;
图8和9显示了组装依照图7的铁磁结构的顺序步骤;
图11显示了依照图10的铁磁结构的一部分;
图12显示了依照图14的铁磁结构的分解图;
图16显示了依照图14的铁磁结构的分解图。
具体实施方式
图1、2和3显示了现有技术的组合式轴承的一些纵向截面。图4和5显示了现有技术的组合式轴承的两个可能的径向截面。
所显示的可供选择的设计结构均由叠片转子叠层组1、叠片定子叠层组2、定子磁轭3、磁极磁轭12、两个轴向磁极4a、4b和至少三个径向磁极5构成。
轴向力受轴向控制线圈6控制,该轴向控制线圈的结构是旋转对称的。
径向力受径向控制线圈7控制,该径向控制线圈缠绕在径向磁极5周围。
如果永久磁铁8不产生偏磁场,可通过某种特定方式将偏置电流增加到轴向控制电流中、或通过将偏置电流引导穿过单独的偏置线圈中而产生偏磁场,所述偏置线圈呈旋转对称形式,并且靠近轴向控制线圈6布置。上述偏置线圈具有与轴向控制线圈6相同的构造,并且与该轴向控制线圈6物理分离,但紧邻该轴向控制线圈。
当将电流供给至径向控制线圈7时,磁通量开始在定子叠层组2的薄片平面中流动。
供给至轴向控制线圈6的电流所产生的磁通量经过磁极磁轭12,接着进入轴向磁极4a,穿过该轴向磁极与转子叠层组1的间隙以及转子叠层组与相对的轴向磁极4b的间隙,最终返回到磁极磁轭12。
结果,由于轴向控制电流随着时间而变化,时变磁通量经过定子叠层组2的中心孔。
根据法拉第-楞次定理和欧姆定理,定子叠层组2的薄片中感应出循环电流。因此,本发明的目的是提供用于该感应循环电流的衰减装置。
循环电流受到的阻抗主要由薄片叠层组的切向电阻决定。
可能还存在小的感应作用,但相对有限。本发明涉及在叠片叠层组周围安装另外的装置,这样,明显增大对阻抗的感应作用。
依照本发明,这是通过使定子磁轭与围绕定子磁轭3的闭合铁磁结构9相联接的方式实现的,如图6所示。
实际上,这种"联接"是指上述铁磁结构9实际上围绕定子磁轭3的一部分,同时定子磁轭3也围绕上述铁磁结构9的一部分,就像联接在一起的链条的两个链路。
图7、10、13和14显示了带有几个典型型式的围绕中空铁磁结构9的材料叠片叠层组的定子磁轭3的轴向截面。
为了最大化该方法的性能,理论上,可以采用另外的手段来限制或防止在中空铁磁结构中感应的涡流。
这可以通过例如利用诸如铁素体部分、软磁复合物部分或堆叠的薄铁磁薄片部分制成的部分10组装中空铁磁结构9而实现。
为了最小化铁磁结构9的磁阻和成本,上述部分10优选为U形,如图8所示。
图9显示了可以使这种U形部分安装在定子磁轭3周围的方式。代替使用U形部分10,也可以使用直的部分11,如图11所示。
图12显示了可以使图11的这些直的部分11安装在定子磁轭3周围的方式。为了最小化磁阻,必须将这些部分压紧在一起。
但是,这种中空铁磁结构9也可以通过在材料叠片叠层组的定子磁轭3周围缠绕非晶体条带或纳米晶体条带制成,如图13所示。
代替直接缠绕这些材料,也可以将这些材料缠绕在一单独的结构上,所形成的中空铁磁结构可以被分成多个部分,如图15所示,这些部分再在材料叠片叠层组的定子磁轭3周围联接在一起,如图16所示,并且将这些部分压紧在一起,以便最小化磁阻。
本发明在任何情况下都不局限于上述以及附图所示的实施例,而是,在不脱离本发明范围的情况下,能以各种型式实现依照本发明的磁力轴承。
Claims (15)
1.一种磁力轴承,其设置有径向致动器部分和轴向致动器部分,上述径向致动器部分包括设置有定子磁轭(3)的叠片定子叠层组(2),其特征在于,定子磁轭(3)与围绕该定子磁轭(3)的闭合铁磁结构(9)相联。
2.如权利要求1所述的磁力轴承,其特征在于,所述轴向致动器部分包括围绕所述叠片定子叠层组(2)的至少一个轴向控制线圈(6),而且还包括磁极磁轭(12)和两个轴向磁极(4a和4b);永久磁铁(8)设置在定子磁轭(3)和两个轴向磁极(4a和4b)之间;上述永久磁铁(8)在轴向方向上被磁化;以及永久磁铁(8)在定子磁轭(3)的两个轴向侧的磁化方向相反。
3.如权利要求1所述的磁力轴承,其特征在于,径向磁化的永久磁铁(8)围绕所述叠片定子叠层组(2);以及,轴向致动器部分的至少一个轴向控制线圈(6)安装在径向磁化的永久磁铁(8)和叠片定子叠层组(2)的至少一个轴向侧上。
4.如权利要求3所述的磁力轴承,其特征在于,径向磁化的永久磁铁(8)构建为一系列相邻安装的更小永久磁铁。
5.如权利要求1所述的磁力轴承,其特征在于,所述轴向致动器部分包括至少一个轴向控制线圈(6)、磁极磁轭(12)和两个轴向磁极(4a和4b);以及,上述至少一个轴向控制线圈(6)安装在所述叠片定子叠层组(2)的至少一个轴向侧上。
6.如权利要求5所述的磁力轴承,其特征在于,上述磁极磁轭(12)接触上述定子磁轭(3)。
7.如权利要求5或6所述的磁力轴承,其特征在于,该磁力轴承设置有偏置线圈,所述偏置线圈具有与所述轴向控制线圈(6)相同的构造,并且与该轴向控制线圈(6)物理分离,并紧邻该轴向控制线圈(6)。
8.如权利要求1所述的磁力轴承,其特征在于,上述闭合铁磁结构(9)包括彼此电绝缘的成组的薄片。
9.如权利要求1所述的磁力轴承,其特征在于,上述闭合铁磁结构(9)包括缠绕的扁平条带。
10.如权利要求1所述的磁力轴承,其特征在于,上述闭合铁磁结构(9)包括铁素体。
11.如权利要求1所述的磁力轴承,其特征在于,上述闭合铁磁结构(9)包括软磁性复合粉末。
12.如权利要求1所述的磁力轴承,其特征在于,上述闭合铁磁结构(9)包括非晶体材料或纳米晶体材料。
13.如权利要求1所述的磁力轴承,其特征在于,上述闭合铁磁结构(9)包括多个互连的部分。
14.一种用于制造磁力轴承的方法,其特征在于:该方法包括下列步骤:
-提供定子磁轭(3);
-提供一组铁磁体部分,所述铁磁体部分形成内尺寸大于或等于上述定子磁轭(3)的轴向截面的外尺寸的闭合路径;
-将铁磁体部分放置在定子磁轭(3)周围,由此形成闭合路径;
-将所有铁磁体部分牢固地压紧在一起;和
-将形成的铁磁结构(9)固定到定子磁轭(3)上。
15.一种用于制造磁力轴承的方法,其特征在于:该方法包括下列步骤:
-提供定子磁轭(3);
-在由诸如非晶体条带、纳米晶体条带、磁性线或纤维材料所形成的筒管上提供铁磁材料;
-电绝缘定子磁轭(3);
-在定子磁轭周围缠绕所述筒管上的铁磁材料,以便在该定子磁轭(3)周围形成铁磁结构(9);和
-将形成的铁磁结构(9)固定到定子磁轭(3)上。
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BE201200328A BE1020693A3 (nl) | 2012-05-16 | 2012-05-16 | Magnetisch lager en werkwijze voor het monteren van een ferromagnetische structuur rond een kern van een magnetisch lager. |
BE2012/0328 | 2012-05-16 | ||
PCT/BE2013/000023 WO2013170322A1 (en) | 2012-05-16 | 2013-05-03 | Magnetic bearing and method for mounting a ferromagnetic structure around a core of a magnetic bearing |
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