CN1118920C - 液体冷却的异步电机 - Google Patents
液体冷却的异步电机 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
- H02K2205/09—Machines characterised by drain passages or by venting, breathing or pressure compensating means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
为了确保有效的冷却和在定子与转子之间的温度平衡,提供一种异步电动机,其含有封闭的冷却液体回路,所述回路沿着转子和定子的整个长度相继通入定子(1)和转子轴(3)。在转子轴中设置一泵(15)。液体通过静止的轴向管(16)被注入泵中,并在所述轴和管子之间流出。所述泵包括被固定在所述轴的孔的底部的泵部件(20),和被固定在轴上的面向注入管的外部螺旋形肋(17)的纵向叶片(21)。液体被沿着定子外周的环境空气所冷却。
Description
本发明涉及一种异步电气机械(简称电机),尤其涉及异步电动机,其包括一在定子内的并含有液体冷却系统的转子,所述转子具有一中空的轴,其中设置一用于使液体循环的泵。
本发明特别适用于在电牵引或混合车辆的异步电动机,这些电动机必须具有高的比输出,必须是小型的,并且必须具有尽可能少的特别是用于冷却液体的外部连接器。
通常在这种电动机中,冷却液体只在定子中循环,然后冷却液体被引入一被空气冷却的外部散热器。这种设置引起散热器和连接管道布局的困难。此外,不良冷却的转子变得比定子热得多。在一方面,温度的增加迫使设计者限制电流,因而限制电动机的功率,在另一方面,在转子和定子之间的温差导致不同的膨胀,这可以引起机械破坏,特别是在电动机轴承中。
德国专利申请No.4020416描述了一种泵组合在由车辆的牵引电动机驱动的发电机的轴中。这种泵包括具有几个平行通道的中心静止的本体,其具有这样的空间要求,使得其只能被容纳在特别大直径的轴中,上述的系统只冷却转子的轴,但是不冷却定子。
本发明涉及一种异步电气机械,尤其涉及电动机或发电机,其液体冷却系统被这样设置,使得在很大程度上避免上述的缺点。
因此,按照本发明的异步电气机械的特征在于,其液体回路是一在机械内的封闭的回路,并基本上在转子的整个长度上和定子的整个长度上通过定子和转子轴。
因而便获得了一种在电动机内完全封闭的冷却系统,既不需要一外部泵,也不需要和外部散热器连接。液体连续地通过定子和转子进行循环保证了在这两个电机部件之间一个良好的温度平衡,因而膨胀的差别较小,局部温度增加较小,因而允许一较大的比输出与/或减少相同输出条件下的电机体积。
最好是,在定子中的液体回路通过一个冷却室,在其中液体和定子的周围壳体相接触,定子配备有外部风扇,然后,该回路通入设置在定子的支撑结构中的回路中。
这意味着冷却室和定子的周围壳体形成水-空气热交换器,当电气机械是用于电动汽车的电动机时,特别是电动机单独和车辆的轮子相连并位于轮子的通路中时,该壳体基本被暴露在强的气流中。
本发明的其它特点和优点由下面结合附图给出的非限制性的例子的说明中将看得更加清楚,其中:
图1是按照本发明的异步电动机通过轴的剖面示意图,
图2以放大的比例表示图1的细节,其中表示在转子轴中包含的泵的部分,以及
图3和图4表示沿着图2的III-III取的泵的部分的两个示意的截面图。
参看图1和图2,图中所示的异步电动机包括定子1和具有一空心轴3的转子2,所述轴借助于轴承6和7被安装在定子之法兰4和5中。定子的支撑结构用标号8表示,定子绕组用9表示,转子电枢用10表示,转子的转动轴线用11表示。空心轴3的中心孔12是盲孔,轴在其驱动端1被封闭,而在其相反端14是开口的。孔12至少在电枢10的整个长度上延伸,并最好在位于电动机内的轴3的整个长度上延伸,即也延伸进入轴承6和7的区域。
由于具有一封闭的包括位于轴3的孔12中的泵15的例如水或油的冷却液体回路,所以电动机可以被冷却。泵的静止部分基本上由中心注入管16构成,其被固定在定子法兰5上,并在孔12的底部附近敞开。在其外表面上,这根管件配备有至少一个螺旋肋17,其最好在管的整个长度上延伸并具有恒定的高度。所述的管和其肋可以由钢或任何其它合适的材料制成。
泵15的旋转部分包括在一方的离心泵部件20,其被设置在面向管16之出口的孔12的底部,并在另一方设置两个或多个纵向叶片21,它们在轴的孔12的圆周上被规则地分开配置,并面向螺旋肋17。出于平衡的原因,最少提供两个叶片21,但也可以提供多个叶片。如果需要,这些叶片也可以具有螺旋的形状。
泵部件20也起离心泵轮的作用。它可以由在孔12的底部上制造的溢流装置构成,或者由固定在所述孔中的泵轮构成。部件20在管16的出口处吸入液体,并将其在这管子和空心轴3之间向回驱动,因而确保一基本压力和液体与轴之间的良好的热交换。接着,包括叶片21和肋17的泵的轴向部分产生一附加的泵压,并且叶片21形成附加的热交换表面。
为了以低的转速产生足够的流量,叶片21的自由边缘位于离开螺旋肋17的自由边缘为一个小的距离处,如图3所示。这使得即使电动机在慢速旋转时,也能确保有效的冷却。
不过,当电动机快速转动时,泵会消耗过多的功率。在最佳实施例中,这个缺点被这样克服了:旋转叶片21可以按照这种方式变形,使得其和肋17的距离是可变的,特别是通过使叶片21弯曲或挠曲。这种情况如图4所示。
这种效果可以用不同的方式获得。叶片21可以在它们施加给液体上的动态压力之(反)作用下通过挠曲简单地沿横向变形。这种叶片例如可以被沿纵向插置在轴3中的槽中。在这种情况下,图3说明了叶片21在静止或在低速转动(沿箭头R的方向)时的情况,而且,在低转速时,具有相当高的泵流量。在高速时,叶片21如图4所示被弯曲,使得流量、液压负荷损失和所消耗的机械功率比刚性叶片增加得较慢。
按照图3的叶片21的位置可产生湍流液压状态,其增加了转子和液体之间的热交换,特别是在低速时,此时转子电流可以相当大。相反,按照图4的位置则允许层流,因而在高速时可以减少液压损失。
另一种解决办法是使叶片21受温度影响而变形,例如使叶片由具有不同热膨胀系数的两种金属层材制成。在这种情况下,图3表示高温位置,其提供相当高的流量,图4表示低温位置,其消耗较少的机械功率。在这种解决办法中,叶片21也可以是可弯曲的,使得在高速时限制流量。
在定子1中,冷却液体系统包括一基本上是圆柱形的冷却室24,其沿着外部金属壳体25延伸过定子的整个圆周和长度,金属壳体例如由轻金属或金属板制成其上具有外部散热器26。这样,壳体25构成一个由周围空气冷却的散热器。沿着箭头方向循环的液体然后到达定子支撑结构8的管道27,以便冷却支撑结构和绕组,然后,通过相反于驱动侧的法兰5的径向通道28,液体被带入注入管16内部。然后流入泵15的液体在整个长度上冷却轴3和转子。在轴的孔12的出口,液体通过一环形室30和法兰5的径向通道31,从而返回冷却室24。在室30和轴承7之间,只需要一个密封垫32。法兰5的通道28和31可以这样设置,使得在电机静止时通过对流可激起液体的循环。本领域的技术人员将会注意到,这些通道以及管道27可以由铸造技术制成,因而不产生密封问题,因为它们完全位于电机的固定部分内。
上面的说明表明,本发明可以实现这样一种异步电动机(如果需要也可以是发电机),从冷却的观点看来,这种电机是自激的,因为它既不需要外部泵也不需要外部散热器,也不需要任何外部流体回路。这便可以实现小型化和完全封闭的结构,这尤其适用于在浸蚀性和易爆性环境中或用于汽车上。在后一种应用中,本发明为电机的布局提供了较大的自由度,特别是可以省略电机外部的液压回路,这些回路占据空间,引起负荷损失并因为电机的运动而要求可弯曲的回路,它们经常易于破坏。
在电机轴内部的泵的结构会产生轻微的轴向推力,这能够在所有速度下使转子稳定,因而能够阻止在轴承中出现振动。此外,因为在转子和定子之间的温差被大大减小,因而也可以减小或除去轴承中的轴向间隙。这使得可以优化发电机的结构,并延长其使用寿命。
Claims (10)
1.一种异步电机,包括
一定子(1),有一个支撑结构(8)、回路装置(27)和一个外部壳体(25),
一个转子(2),安装在所述定子内并有一个空心轴(3),
一个封闭冷却回路,它穿过所述回路装置(27)并在所述空心轴(3)的内部延伸并且该冷却回路基本上在转子的整个长度和定子的整个长度上延伸,
一个用于使液体在所述冷却回路中循环的泵(15),所述泵结合在转子的所述空心轴(3)中,
其特征在于,冷却回路是一个在电机内部封闭的回路,包括一个散热器,该散热器有一个布置在定子(1)中的冷却室(24),在该冷却室中液体与定子的外部壳体(25)相接触。
2.如权利要求1所述的电机,其特征在于,所述外部壳体(25)具有外部散热器(26)。
3.如权利要求1所述的电机,其特征在于,转子的轴(3)包括一个中心孔(12),其在轴的驱动侧上被封闭,而在相反侧被敞开,并且液体回路包括一沿轴向伸入所述孔并在孔的底部附近敞开的静止的注入管(16)。
4.如权利要求3所述的电机,其特征在于,泵(15)包括一被设置在转子轴的孔(12)的底部的离心泵部件(20)。
5.如权利要求3或4所述的电机,其特征在于,注入管(16)配备有至少一个螺旋形的外部肋(17)。
6.如权利要求5所述的电机,其特征在于,至少两个纵向的或螺旋形的旋转叶片(21)被固定在所述轴的孔中,使得能够围绕注入管的螺旋形肋(17)旋转。
7.如权利要求6所述的电机,其特征在于,旋转叶片(21)可以变形,使得它们离开螺旋形肋的距离是可变的。
8.如权利要求7所述的电机,其特征在于,所述旋转叶片(21)能够受它们施加于液体上的动态压力的影响而变形。
9.如权利要求7所述的电机,其特征在于,旋转叶片(21)能够受温度的影响而变形。
10.如权利要求3所述的电机,其特征在于,所述定子在驱动侧的相反侧通过一含有第一通道(31)和第二通道(28)的法兰(5)被封闭,所述第一通道连接轴的孔(12)之出口和冷却室(24),所述第二通道连接定子的回路装置(27)和注入管(16),这样使所述注入管被固定到法兰上。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP98118291.8 | 1998-09-28 | ||
EP98118291A EP0989658A1 (fr) | 1998-09-28 | 1998-09-28 | Machine électrique asynchrone refroidie par liquide |
Publications (2)
Publication Number | Publication Date |
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CN1249558A CN1249558A (zh) | 2000-04-05 |
CN1118920C true CN1118920C (zh) | 2003-08-20 |
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CN99120726A Expired - Fee Related CN1118920C (zh) | 1998-09-28 | 1999-09-27 | 液体冷却的异步电机 |
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Country | Link |
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US (1) | US6191511B1 (zh) |
EP (1) | EP0989658A1 (zh) |
JP (1) | JP2000102216A (zh) |
KR (1) | KR20000023369A (zh) |
CN (1) | CN1118920C (zh) |
AU (1) | AU759673B2 (zh) |
BR (1) | BR9904365A (zh) |
CA (1) | CA2283875A1 (zh) |
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-
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- 1999-09-22 AU AU50081/99A patent/AU759673B2/en not_active Ceased
- 1999-09-27 CA CA002283875A patent/CA2283875A1/fr not_active Abandoned
- 1999-09-27 US US09/406,105 patent/US6191511B1/en not_active Expired - Fee Related
- 1999-09-27 CN CN99120726A patent/CN1118920C/zh not_active Expired - Fee Related
- 1999-09-28 JP JP11273958A patent/JP2000102216A/ja active Pending
- 1999-09-28 BR BR9904365-3A patent/BR9904365A/pt not_active Application Discontinuation
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CN104426269A (zh) * | 2013-09-10 | 2015-03-18 | 西门子公司 | 具有轴的电机 |
CN104426269B (zh) * | 2013-09-10 | 2019-06-18 | 西门子公司 | 具有轴的电机 |
Also Published As
Publication number | Publication date |
---|---|
US6191511B1 (en) | 2001-02-20 |
BR9904365A (pt) | 2001-03-20 |
EP0989658A1 (fr) | 2000-03-29 |
JP2000102216A (ja) | 2000-04-07 |
CN1249558A (zh) | 2000-04-05 |
AU759673B2 (en) | 2003-04-17 |
AU5008199A (en) | 2000-03-30 |
KR20000023369A (ko) | 2000-04-25 |
CA2283875A1 (fr) | 2000-03-28 |
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