WO2016192094A1 - 一种电感制造方法 - Google Patents

一种电感制造方法 Download PDF

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Publication number
WO2016192094A1
WO2016192094A1 PCT/CN2015/080826 CN2015080826W WO2016192094A1 WO 2016192094 A1 WO2016192094 A1 WO 2016192094A1 CN 2015080826 W CN2015080826 W CN 2015080826W WO 2016192094 A1 WO2016192094 A1 WO 2016192094A1
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Prior art keywords
inductor
coil
magnetic core
outer magnet
density
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PCT/CN2015/080826
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English (en)
French (fr)
Inventor
郭雄志
阮佳林
刘志达
肖强
罗涛
林泉
陶家智
邱俊
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深圳市铂科磁材有限公司
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Priority to PCT/CN2015/080826 priority Critical patent/WO2016192094A1/zh
Publication of WO2016192094A1 publication Critical patent/WO2016192094A1/zh

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00Fixed inductances of the signal type 
    • H01F17/04Fixed inductances of the signal type  with magnetic core
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties

Definitions

  • the present invention relates to the field of inductance, and more particularly to a method of manufacturing an inductor.
  • UPS photovoltaic power inverters
  • photovoltaic inverters photovoltaic inverters
  • wind power etc.
  • filters, chokes, transformers and reactors are widely used in circuit control systems. Filtering, rectification, and inverter can all be applied to inductive components.
  • inductors or reactors plays a crucial role in the development of the modern electronics industry. Components made by traditional processes are gradually not fully applicable to the future development of miniaturization, and a high-performance miniaturized inductor or reactor is developed. To adapt to the rapid development of modern electronic technology, it has very significant significance.
  • the manufacturing process of a conventional inductor or reactor mainly includes:
  • the traditional wire-wound power inductor pin is basically drawn from the enameled wire and hung on a sheet-like or round-pin electrode bonded with epoxy resin and then soldered to make it reliable. The contact is good. In this way, the expansion and contraction rates of various materials are inconsistent.
  • the inductor works in the process of heating and cooling, which causes different expansion and contraction of related materials. If the time is long, the abnormal loss of the device pad will be caused. 2) In the process of the inductor, the current will flow due to the current flowing through the inductor. Under the high temperature condition of the long-term working body, the solder joint of the enameled wire lead-out head and the inductor pad is oxidized, resulting in an abnormal open circuit.
  • the patch type traditional winding power inductor Most of its pads use an epoxy-based organic adhesive to bond the inductor pads to the core body. Due to the difference in the assembly process of the inductor, it is easy to cause PCB and PCB. There is a lack of coplanarity when mounting, and there is a reliability doubt about the solder joint strength when the inductor is used for a long time.
  • the skeleton ferrite machine-assisted winding and automation.
  • the coil is heated. It is necessary to increase the wire diameter and the like to improve the heat dissipation.
  • the temperature derating is applied when the inductor is applied, and mechanical or electromagnetic resonance noise is generated from time to time during the operation of the inductor. That is to say, this type of inductor or reactor, due to the reliability requirements of the material cost, needs to be increased in material cost to meet the derating.
  • the method of segmenting the air gap can only solve the utilization of the partial winding space.
  • the magnetically permeable glue potting structure has the following defects in application: 1 In the process of magnetically encapsulating, there are inevitably structural defects such as bubbles, which may result in insufficient contact between the coil and the magnetically conductive rubber, resulting in abnormal heat dissipation and noise, etc. during the application of the inductor, shortening the service life of the inductor and making Customer circuit performance is poor; 2 When the magnetic conductive material is heated or cooled, its expansion and contraction rate are inconsistent with the magnetic core and the coil. When the inductor is operated under long-term high temperature and high current conditions, the rubber is peeled off, and the magnetic shielding and mechanical properties of the inductor are degraded, and reliability quality exists. Hidden dangers.
  • Chinese invention patent publication number CN101552091A A metal powder injection molding inductor and a manufacturing method thereof are disclosed, which comprise loading a magnetic core in a hollow cavity of an enameled wire coil body and injecting ferromagnetic metal powder to wrap the coil and the magnetic core, thereby completing the integrally formed inductor.
  • This method solves the problem of poor electrical performance and high production cost of the prior art to some extent. However, its electrical performance still has room for further improvement, and its heat dissipation performance is not good, and it is easily damaged under long-term working conditions.
  • the invention provides a method for manufacturing an inductor, which solves the problem that the electrical performance of the inductor is poor, the heat dissipation effect is poor, and the damage of the mechanical stress on the coil in the original integral molding is solved, that is, the insulation capability of the original coil is not damaged or destroyed.
  • the invention provides a method for manufacturing an inductor, comprising the following steps:
  • the outer magnet has a density of 5.0 to 6.0 g/cm3.
  • the core density is 5.5 to 8.0 g/cm3.
  • the method further includes the step of disposing a heat sink outside the forming inductor.
  • the heat sink is made of pure aluminum.
  • the manufacturing method of the inductor is an integrally formed inductor, and the coil is embedded in the magnetic core, which simplifies the production process of the magnetic core;
  • the integrated molding method makes the processing of the inductor simple, thereby reducing the cost of manufacturing the inductor.
  • the magnetic core and the outer magnet have different densities, and the whole is fully enclosed magnetic shielding structure, and the EMI of the inductor The effect is better than the existing one-piece inductor.
  • a method for manufacturing an inductor includes the following steps:
  • the mixed powder system is injected into the cavity of the injection mold and sintered to obtain an outer magnet, and the density of the outer magnet is less than the density of the core.
  • a heat sink is disposed outside the molded inductor.
  • the radiator is made of pure aluminum.
  • the outer magnet has a density of 6.0 g/cm3.
  • the difference from the embodiment 1 is that the outer magnet has a density of 5.5 g / cm 3 and the core density is 6.0 g / Cm3; the heat sink is made of pure copper material.
  • the other steps in this embodiment are the same as those in the first embodiment.
  • the difference from the embodiment 1 is that the outer magnet has a density of 5.0 g / cm 3 and the core density is 7.0 g / cm 3 . .
  • the other steps in this embodiment are the same as those in the first embodiment.
  • the outer magnet has a density of 6.0 g/cm3 and the core density is 8.0 g/cm3. .
  • the other steps in this embodiment are the same as those in the first embodiment.
  • the integrated molding method makes the processing of the inductor simple, thereby reducing the cost of manufacturing the inductor.
  • the magnetic core and the outer magnet have different densities, and the whole is fully enclosed magnetic shielding structure, and the EMI of the inductor The effect is better than the existing one-piece inductor.

Abstract

提出了一种电感制造方法,包括以下步骤:(1)绕制漆包线线圈;(2)将第一铁磁粉压制成磁芯;(3)将磁芯装入线圈的空心腔内;(4)将线圈装入注射模具内;(5)将第二铁磁粉与高温树脂胶均匀搅拌,得到混合粉体;(6)将所述混合粉体注入所述注射模具内成型得到外磁体,并保证所述外磁体密度小于所述磁芯密度。(7)冷却,脱膜,得到成型电感。通过上述方案制造的电感,具有以下优点:(1)导热性较好,使用寿命长;(2)磁芯与外磁体密度不同,整体实现全封闭磁屏蔽结构,电感的EMI效果较之现有的一体成型电感更好;(3)并解决了原一体成型中机械应力对线圈的破坏,即不损伤或破坏原线圈的绝缘能力。

Description

一种电感制造方法 说明书
一种电感制造方法
技术领 域
本发明涉及电感领域,特别是指一种电感制造方法。
背景技术
随着电子工业的发展,在各种开关电源、 UPS 、光伏逆变器、风能等电源中,滤波器、扼流圈、变压器和电抗器等大量应用于电路控制系统中。滤波、整流和逆变等都可以应用到电感类元件。
电感器或电抗器的使用对于现代电子工业的发展有着至关重要的作用,传统工艺制作的元件渐渐不能完全适用于未来小型化的发展,开发一种高性能的小型化的电感器或电抗器以适应现代电子科技的高速发展,具有非常重大的意义。
传统电感器或电抗器的制造工艺过程主要包括:
一、磁环类磁芯,人工穿线或机器辅助穿线。这种电感制造工艺繁琐,生产过程成本高,对磁环的一致性要求较高。而且大多数电感需要采用手动或者半自动化的方式在磁芯表面绕制绝缘线圈,不易实现生产自动化。对于工业大批量生产来说,需要耗费较多的人力和时间,这必然也会提高生产的成本,极大的限制了电感的发展和现代电子信息技术的进步。另外存在着 1 )电极焊盘可靠性不足,传统绕线功率电感引脚基本上是采用将漆包线直接引出挂在用环氧树脂等胶水粘合的片状或圆针型电极上再予以加锡焊接使其可靠接触良好,这样一来,各种材料膨胀和收缩率不一致,电感工作在发热、冷却过程中导致相关材料产生不同膨胀和收缩,时间长了会引起器件焊盘脱落等异常品质隐患; 2 )电感在工作过程中因电流流过会导致其本体发热,在其长期工作本体高温条件下漆包线引出头与电感焊盘挂线处焊点氧化导致电感开路等异常。
二、贴片式传统绕线功率电感。它的焊盘绝大部分采用以环氧树脂为主要材料的有机粘合胶将电感焊盘与磁芯本体粘结在一块组成,因电感的组装工艺差异容易导致其与 PCB 贴装时共面性差、电感长期工作时其焊点强度存在信赖性疑虑。
三、骨架类铁氧体,可机器辅助绕制与自动化。但由于漏磁通的引入导致线圈发热,需要增大线径等提高散热的方法进行应用时的温度降额使用,电感工作时也不时会产生机械或电磁谐振噪音。也就是说此类型的电感器或电抗器,在物料成本上由于可靠性要求的存在,所以需要在物料成本上要增加来满足降额。分段气隙的方法也只能解决部分绕制空间的利用率提高。
四、'工'字型铁氧体或合金类,可通过自动化生产。传统功率电感绝大部分产品是采用'工'字磁芯为主体磁芯材料绕制而成,其结构不可避免存在如下应用中的瓶颈: 1 )电感抗跌落性能不理想:'工'字形电感结构决定了其远离磁芯中柱的电感本体边缘承受跌落或冲击能力变得薄弱,这样一来电感在受到跌落冲击时容易导致磁芯破碎等异常: 2 )整机组装过程中功率电感在安装不当或料件吸咐过程中位置偏斜容易引起电感本体破损异常。另外,'工'字型绕线目前相当一部分产品采用导磁胶填充磁芯的侧面凹槽以增强其机械强度,减少漏磁干扰。目前这种导磁胶灌封结构在应用中存在如下缺陷: 1 )导磁胶灌封过程中不可避免存在气泡等结构缺陷,这样一来导致线圈与导磁胶不能充分接触从而导致电感应用过程中线圈散热不良及噪音等异常情形,缩短电感的使用寿命、使客户电路性能变差; 2 )导磁材料受热或冷却时其膨胀和收缩率与磁芯以及线圈并不一致,电感在长期高温和大电流条件下工作时导致胶脱落使电感磁屏蔽和机械特性等方面下降,存在可靠性品质隐患。
五、传统绕线功率电感,绝大部分采用开放、热缩套管、导磁胶等方式组成,(主要根据客户产品应用条件、可靠、稳定要求制成并选用)其结构对漏磁的屏蔽效果并不是很好,电感工作时对其周边 IC 、电源模块等电磁场敏感类元器件造成漏磁干扰,从而使得客户产品性能变差, EMI 对策成本增加。
六、传统绕线功率电感因结构和磁芯材料发展的局限性,针对高额定电流的电感产品其体积、外型尺寸受到了一定限制,不适合客户高密度布板以及对体积和空间要求较高的便携式电子产品,与新型发展起来的叠层和平板型功率电感相比存在一定的局限性。
七、中国发明专利公布号 CN101552091A 公布了一种金属粉末注射成型电感及其制造方法,包括在漆包线线圈主体空心腔内装入导磁芯并将铁磁金属粉末注入以包裹线圈及导磁芯,从而完成一体成型的电感。这种方法一定程度上解决了现有技术的电感电气性能差、生产成本高的问题。但是,其电气性能依然具有进一步提升的空间,且其散热性能不佳,在长时间工作情况下极易损坏。
鉴于此,提供一种新型的高密度一体注射成型电感的制造方法成为必要。
发明内容
本发明提出一种电感制造方法,解决了现有技术中电感电气性能差、散热效果不佳且解决了原一体成型中机械应力对线圈的破坏,即不损伤或破坏原线圈的绝缘能力。
本发明的技术方案是这样实现的:
本发明一种电感制造方法,包括以下步骤:
( 1 )绕制漆包线线圈呈螺旋状;
( 2 )将第一铁磁粉通过机械压制成磁芯;
( 3 )将所述磁芯装入所述漆包线线圈的空心腔内;
( 4 )将装有所述磁芯的所述漆包线线圈装入注射模具内;
( 5 )将第二铁磁粉与高温树脂胶均匀搅拌,得到混合粉体;
( 6 )将所述混合粉体注入所述注射模具的模腔内成型得到外磁体,并保证所述外磁体密度小于所述磁芯密度。
( 7 )冷却,脱膜,得到成型电感。
进一步,所述外磁体密度为 5.0~6.0 g/ cm3 。
进一步,并保证所述磁芯密度为 5.5~8.0g/cm3 。
进一步,完成所述步骤( 7 )后,还包括以下步骤:在所述成型电感外侧设置散热器。
进一步,所述散热器为纯铝材质。
本发明的有益效果是:通过上述方案制造的电感,较传统电感具有以下优点:
( 1 )本电感制造方法为一体成型电感,将线圈埋入于磁芯里面,简化了磁芯的生产工艺;
( 2 )一体成型电感可实现自动化制造;
( 3 )采用一体成型方法,电感的加工较简单,从而降低了生产制作电感器的成本。
而相较于现有技术所揭示的电感制造工艺,则具有以下优点:
( 1 )导热性较好,使用寿命长;
( 2 )磁芯与外磁体密度不同,整体实现全封闭磁屏蔽结构,电感的 EMI 效果较之现有的一体成型电感更好。
( 3 )不存在机械应力对线圈的破坏,即不损伤或破坏线圈的绝缘能力。
具体实施方式
下面将对本发明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发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例 1 :
本实施例一种电感制造方法,包括以下步骤:
( 1 )通过自动绕线机,将漆包线线圈绕制呈螺旋状;
( 2 )将第一铁磁粉通过粉末成型压制机压制成磁芯;
( 3 )将磁芯装入漆包线线圈的空心腔内;
( 4 )将装有磁芯的漆包线线圈装入注射模具内;
( 5 )将第二铁磁粉依次与高温树脂胶、粘结剂均匀搅拌,得到混合粉体的喂料;
( 6 )将混合粉体制粒后注入注射模具的模腔内烧结成型得到外磁体,并保证外磁体密度小于磁芯密度。
( 7 )冷却,脱膜,得到成型电感。
( 8 )在成型电感外侧设置散热器。散热器为纯铝材质。
在本实施例中,外磁体密度为 6.0 g/ cm3 。
并保证磁芯密度为 6.5 g / cm3 。
实施例 2 :
在本实施例中,区别于实施例 1 的是:外磁体密度为 5.5 g /cm3 ,磁芯密度为 6.0 g/ cm3 ;散热器为纯铜材料制成的。本实施例中其它步骤同实施例 1 。
实施例 3
在本实施例中,区别于实施例 1 的是,外磁体密度为 5.0g / cm3 ,磁芯密度为 7.0 g/cm3 。本实施例中其它步骤同实施例 1 。
实施例 4
在本实施例中,区别于实施例 1 的是,外磁体密度为 6.0g/cm3 ,磁芯密度为 8.0g/ cm3 。本实施例中其它步骤同实施例 1 。
以相同规格的实施例 1-4 所述方法制造的电感和现有一体成型制造的电感做电气性能测验,得到如下数据:
现有一体成型电感 实施例 1 实施例 2 实施例 3 实施例 4
线圈圈数 30 30 30 30 30
有效磁路长度 l ( cm ) 15.8 15.8 15.8 15.8 15.8
初始感量 L@0A 201.54 269.62 268.73 268.62 269.81
5A 电流下保留的感量值 L@5A 180.26 266.69 265.58 265.61 266.94
通过上述方案制造的电感,较传统电感具有以下优点:
( 1 )一体成型电感,将线圈埋入于磁芯里面,简化了磁芯的生产工艺;
( 2 )一体成型电感可实现自动化制造;
( 3 )采用一体成型方法,电感的加工较简单,从而降低了生产制作电感器的成本。
而相较于现有技术所揭示的电感制造工艺,则具有以下优点:
( 1 )导热性较好,使用寿命长;
( 2 )磁芯与外磁体密度不同,整体实现全封闭磁屏蔽结构,电感的 EMI 效果较之现有的一体成型电感更好。
( 3 )不存在机械应力对线圈的破坏,即不损伤或破坏线圈的绝缘能力。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (1)

  1. 1. 一种电感制造方法,其特征在于,包括以下步骤:
    ( 1 )绕制漆包线线圈呈螺旋状;
    ( 2 )将第一铁磁粉通过机械压制成磁芯 ;
    ( 3 )将所述磁芯装入所述漆包线线圈的空心腔内;
    ( 4 )将装有所述磁芯的所述漆包线线圈装入注射模具内;
    ( 5 )将第二铁磁粉与高温树脂胶均匀搅拌,得到混合粉体;
    ( 6 )将所述混合粉体注入所述注射模具的模腔内成型得到外磁体,并保证所述外磁体密度小于所述磁芯密度。
    ( 7 )冷却,脱膜,得到成型电感。
    2. 根据权利要求 1 所述的一种电感制造方法,其特征在于:所述外磁体密度为 5.0~6.0g/cm 3
    3. 根据权利要求 1 所述的一种电感制造方法,其特征在于:并保证所述磁芯密度为 5.5~8.0 g/cm 3
    4. 根据权利要求 1 所述的一种电感制造方法,其特征在于:完成所述步骤( 7 )后,还包括以下步骤:在所述成型电感外侧设置散热器。
    5. 根据权利要求 4 所述的一种电感制造方法,其特征在于:所述散热器为纯铝材质。
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