CN112582162B - 松耦合变压器及采用该变压器的水下无线电能传输系统 - Google Patents

松耦合变压器及采用该变压器的水下无线电能传输系统 Download PDF

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CN112582162B
CN112582162B CN202011390960.5A CN202011390960A CN112582162B CN 112582162 B CN112582162 B CN 112582162B CN 202011390960 A CN202011390960 A CN 202011390960A CN 112582162 B CN112582162 B CN 112582162B
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magnetic core
annular
coil
loosely coupled
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CN112582162A (zh
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凡绍桂
李雪峰
文金伟
周相屹
游江
巩冰
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Harbin Engineering University
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14Inductive couplings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
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    • B60L53/10Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12Inductive energy transfer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30Constructional details of charging stations
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    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/24Magnetic cores
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    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/30Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306Fastening or mounting coils or windings on core, casing or other support
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T90/14Plug-in electric vehicles
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract

本发明公开了一种松耦合变压器及采用该变压器的水下无线电能传输系统,包括由内至外布置的两个环状线圈,所述环状线圈包括沿圆周均匀设置的柱状磁芯绕组,各磁芯绕组外缠绕的导线串联连接,每个环状线圈的柱状磁芯绕组的两端分别通过环状磁芯连接在一起,两个环状线圈之间有间隙。本发明松耦合变压器的发射线圈与接收线圈采用模块化设计,松耦合变压器质量轻,且可实现不同功率等级设计;磁场由磁芯约束减小了电磁场在海水中的涡流损耗;采用磁路对称设计,具有较强的抗偏移能力,且对耦合机构对接精度要求低。

Description

松耦合变压器及采用该变压器的水下无线电能传输系统
技术领域
本发明涉及一种松耦合变压器及采用该变压器的水下无线电能传输系统,属于无线电能传输领域。
背景技术
海洋中有很多不同用途的无人潜航器,一般无人潜航器采用电池供电,当携带的电能耗尽时需要对其充电。有三种充电方式分别为打捞充电、湿插拔充电以及无线电能传输充电,其中感应式无线电能传输充电方式具有自主无人充电、安全性高、可靠性高以及充电装备寿命长的特点,受到越来越多的重视。
潜航器一般采用自主无人干预的水下充电方式,当潜航器剩余电量不足时,自动机动至水下充电基站,然后被充电基站捕获对接开始充电。充电基站捕获潜航器的方法有多种,其中如图1所示的喇叭口状捕获装置研究较多。潜航器被喇叭口状捕获装置捕获后,一般轴向有定位装置,到达定位点后夹紧装置将潜航器固定。潜航器被夹紧后,充电基站的电力变换装置开始驱动发射线圈为潜航器充电。潜航器上的接收线圈感应到电能,并通过电力变换装置将电能保存至携带的电池中。由充电基站的发射线圈与潜航器的接收线圈组成的松耦合变压器是感应式无线电能传输的关键,对电能传输的功率、效率等起到关键作用。
为实现可靠、高效率的,水下无线电能传输,松耦合变压器应该具备以下特点:1.要求磁场在水中的路径尽量少以减小海水涡流损耗;2.潜航器上的磁耦合机构应具有质量轻的特点,便于潜航器携带更多有效载荷;3.抗偏移性能强,水流作用下使发射侧与接收侧没有完全对齐、接收端和发射端的上下浮动和接收端发生转动情况下,仍保持较大耦合系数,保证传输功率与传输效率;4.对松耦合变压器线圈的对接精度要求低,便于工程实现。
为了设计松耦合变压器满足以上要求,研究人员提出多种变压器结构。通过磁芯约束磁场可以减小磁场在海水中的路径,提高效率与耦合系数。Zhiyuan Cheng等在文章《Design and Loss Analysis of Loosely Coupled Transformer for an UnderwaterHigh-Power Inductive Power Transfer System(IEEE TRANSACTIONS ON MAGNETICS,51卷7期,2015)》提出一种半封闭变压器结构,耦合系数高,海水损耗小且具有较强抗轴向偏移能力,不过该变压器结构需要改变潜航器外形,破坏流体结构,且要求较高的对接精度。刘润鹏等在文章《一种改进线圈结构的AUV无线充电系统(水下无人系统学报,28卷3期,2020)》以及曾德鹏等在专利《一种带有分离式电磁定位功能的水下无线电能传输系统(申请号201910554193.8)》提出一种类似电机耦合机构的松耦合变压器机构,该机构具有较强耦合系数与一定抗偏移能力,不过该结构对轴向偏移要求较高。Zhengchao Yan等在文章《Underwater wireless power transfer system with a curly coil structure forAUVs(IET Power Electronics,18卷10期,2019)》中提出一种无磁芯的U型松耦合变压器,大大降低了耦合机构重量,不过磁场经过海水较多,且只利用了潜航器腹部,没有充分利用空间尺寸。刘志珍等在专利《一种应用于水下无线充电的耦合线圈和磁芯结构与系统(申请号201710388670.9)》中介绍了一种磁芯均匀排列,嵌套式松耦合变压器结构,对轴向、径向偏移以及旋转偏移不敏感,提高功率传输稳定性,不过该变压结构的部分磁场会经过海水,会带来较大的海水涡流损耗。
目前的松耦合变压器结构无法同时满足海水损耗小、质量轻、抗偏移性能强以及对接精度低的特点。
发明内容
针对上述现有技术,本发明要解决的技术问题是提供一种松耦合变压器及采用该松耦合变压器的水下无线电能传输系统,实现海水损耗小、质量轻、抗偏移性能强以及对接精度低。
为解决上述技术问题,本发明的一种松耦合变压器,包括由内至外布置的两个环状线圈,所述环状线圈包括沿圆周均匀设置的柱状磁芯绕组,各磁芯绕组外缠绕的导线串联连接,每个环状线圈的柱状磁芯绕组的两端分别通过环状磁芯连接在一起,两个环状线圈之间有间隙。
作为本发明的一种优选方案,由内至外布置的两个环状线圈同心布置。
作为本发明的另一种优选方案,环状磁芯为圆形或多边形。
本发明还包括采用上述任意一种松耦合变压器的水下无线电能传输系统,包括充电舱室、提供电能装置,尺寸较大的环状线圈与提供电能装置相连并设置在充电舱室外围,另一个环状线圈与待供电装置相连,当待供电装置进入充电舱室至两个环状线圈相对位置满足给定位置要求时进行充电。
本发明的有益效果:本发明针对目前用于潜航器的水下无线电能传输系统松耦合变压器无法同时满足海水损耗小、质量轻以及抗偏移性能等方面要求的问题,提出一种新型的松耦合变压器结构及采用该松耦合变压器的水下无线电能传输系统,该松耦合变压器的发射线圈与接收线圈采用模块化设计,松耦合变压器质量轻,且可实现不同功率等级设计;磁场由磁芯约束减小了电磁场在海水中的涡流损耗;采用磁路对称设计,具有较强的抗偏移能力,且对耦合机构对接精度要求低。与现有技术相比,本发明的有益效果为:
1.采用模块化设计。松耦合变压器绕组由如图2所示的柱状绕组组成,可根据传输功率大小以及潜航器尺寸配置柱状绕组尺寸和数量,形成不同功率等级的松耦合变压器。
2.松耦合变压器绕组采用磁芯较少,重量较轻,便于放置在潜航器上。
3.主要磁场路径为磁芯,海水涡流损耗小。由于磁场被磁芯约束,磁场在海水中路径较小,减小了海水的电涡流损耗。
4.对称磁路设计,抗旋转偏移能力强。两个松耦合变压器绕组互相嵌套,磁路对称设计,具有较强的抗偏移能力,且对耦合机构对接精度要求低。
5.采用的磁芯材料几何外形简单,不需要特殊的设计,成本较低,易于实现。
附图说明
图1是基于喇叭口状捕获装置的水下充电基站示意图,1_1为潜航器捕获装置,1_2为潜航器夹紧装置,1_3为潜航器,1_4为充电基站的基座,1_5为充电基站的发射线圈,1_6为充电基站的发射部分电力变换器装置,1_7充电舱室。
图2(a)是圆柱状磁芯绕组,图中2_1为绕组,2_2为柱状磁芯。
图2(b)是长方体状磁芯绕组,图中2_1为绕组,2_2为柱状磁芯。
图3(a)是柱状磁芯绕组的一种连接方式,3_1是条状磁芯,3_3是柱状磁芯绕组。
图3(b)是柱状磁芯绕组的一种连接方式,3_2是圆环磁芯,3_3是柱状磁芯绕组。
图4(a)是松耦合变压器磁芯结构侧视图;4_1是发射侧松耦合变压器绕组的端部磁芯,4_2是发射侧松耦合变压器绕组的柱状磁芯绕组,4_3是接收侧松耦合变压器绕组的柱状磁芯绕组,4_4接收侧松耦合变压器绕组的端部磁芯。
图4(b)是松耦合变压器磁芯结构俯视图;4_1是发射侧松耦合变压器绕组的端部磁芯,4_2是发射侧松耦合变压器绕组的柱状磁芯绕组,4_3是接收侧松耦合变压器绕组的柱状磁芯绕组,4_4接收侧松耦合变压器绕组的端部磁芯。
图5是松耦合变压器磁场强度分布图。
具体实施方式
下面结合附图对本发明具体实施方式做进一步说明。
本发明提出松耦合变压器的设计指导思想是:将磁场约束在磁芯中且采用模块化设计。组成松耦合变压器的基本部件为柱状磁芯绕组如图2(a)和2(b)所示,柱状磁芯上面缠绕着导线形成线圈,磁芯与线圈一起组成柱状磁芯绕组。柱状磁芯形状可以是圆柱状、长方体状或其他柱状结构的磁芯,该磁芯用于约束线圈产生的磁场,为磁场提供磁路。
将多个柱状磁芯绕组围绕圆周均匀放置,各磁芯绕组的导线串联连接,导线连接的原则是通电后柱状磁芯绕组磁场方向相同。然后将各柱状绕组的顶端以及底端通过磁芯连接在一起形成松耦合变压器的一个绕组,如图3(a)和图3(b)所示。连接各柱状绕组两端的磁芯可以是柱状磁芯或者圆环状磁芯,只要将各柱状绕组两端形成封闭的磁路即可。
松耦合变压器由两个绕组组成,只需要按照上述方法设计两个绕组即可。直径较小的绕组放置到直径较大绕组的内部,两个绕组构成松耦合变压器。
如图4(a)和图4(b)所示为所提松耦合变压器方案的一种实现方式。发射端线圈与接收端线圈嵌套在一起,发射端线圈放置在如图1所示的充电基站的1_5发射线圈部位的充电舱室外周;接收线圈与船体兼容,可以嵌入AUV的船体中,从而可以为AUV保留大量空间。轴向有定位装置,当两个线圈满足相对位置关系,例如轴向对齐,卡住以后就能开始充电。
松耦合变压器的发射线圈以及接收线圈均由柱状磁芯绕组以及顶端、底端磁芯组成。将多个柱状磁芯绕组围绕充电基站舱室外周/潜航器外周均匀放置,各柱状磁芯绕组之间留有间距。各磁芯绕组的导线串联连接,导线连接的原则是同一松耦合变压器绕组通电后柱状磁芯绕组磁场方向相同。然后将各柱状绕组的顶端以及底端通过圆环形磁芯连接在一起形成松耦合变压器绕组。
实际应用中,可以根据无线传输功率、效率以及潜航器直径等参数选择松耦合变压器的发射端绕组以及接收端绕组尺寸以及柱状绕组的磁芯及线径,已得到适合的自感系数、互感系数等参数。
该实施实例中,设计的一个松耦合变压器参数为:发射端以及接收端变压器绕组各有6个柱状绕组。柱状绕组的磁芯长、宽、高分别为20mm,20mm,15mm的长方体磁芯,每个磁芯的绕组匝数为15匝;发射线圈直径412mm,接收线圈直径320mm,发射线圈与接收线圈间距为26mm。将内环每30度旋转一次共旋转一周记录采集到的自感、互感和耦合系数如表1所示,可以看出旋转角度在0°~360°范围内,线圈自感以及互感随旋转角度变化较小,耦合系数保持在0.58左右。图5为松耦合变压器的磁场分布图,由图可知,大部分磁场被约束在磁芯中,主磁场发射端磁芯发出经过很短的距离后经过接收端磁芯形成磁场闭环。在磁场的整个路径中,磁场经过的海水距离较小,产生的海水涡流损耗也较小。
表1不同偏移角度对应的电感参数
Figure BDA0002810989450000041
Figure BDA0002810989450000051

Claims (5)

1.一种松耦合变压器,其特征在于:包括由内至外布置的两个环状线圈,所述环状线圈包括沿圆周均匀设置的柱状磁芯绕组,各磁芯绕组外缠绕的导线串联连接,每个环状线圈的柱状磁芯绕组的两端分别通过环状磁芯连接在一起,两个环状线圈之间有间隙。
2.根据权利要求1所述的一种松耦合变压器,其特征在于:由内至外布置的两个环状线圈同心布置。
3.根据权利要求1或2所述的一种松耦合变压器,其特征在于:所述环状磁芯为圆形或多边形。
4.一种采用权利要求1或2所述的松耦合变压器的水下无线电能传输系统,其特征在于:包括充电舱室、提供电能装置,尺寸较大的环状线圈与提供电能装置相连并设置在充电舱室外围,另一个环状线圈与待供电装置相连,当待供电装置进入充电舱室至两个环状线圈相对位置满足给定位置要求时进行充电。
5.一种采用权利要求3所述的松耦合变压器的水下无线电能传输系统,其特征在于:包括充电舱室、提供电能装置,尺寸较大的环状线圈与提供电能装置相连并设置在充电舱室外围,另一个环状线圈与待供电装置相连,当待供电装置进入充电舱室至两个环状线圈相对位置满足给定位置要求时进行充电。
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