CN107104570A - 一种用于植入式轴流血泵的无槽电机 - Google Patents
一种用于植入式轴流血泵的无槽电机 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
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- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
- A61M60/237—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
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- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
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- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
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- H—ELECTRICITY
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- H02K3/28—Layout of windings or of connections between windings
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- H02K3/46—Fastening of windings on the stator or rotor structure
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- H—ELECTRICITY
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- H02K—DYNAMO-ELECTRIC MACHINES
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Abstract
一种用于植入式轴流血泵的无槽电机,它包括有定子铁心、定子绕组、转子转轴、转子永磁体,其特点是,定子铁心由圆环形硅钢片轴向冲压而成,转子永磁体为永磁材料,径向充磁,该定子绕组的线圈介于定子铁心和转子转轴之间,定子绕组粘贴在圆桶形的定子铁心内壁上,定子铁心为无齿槽结构。本发明采用直流无刷无槽的结构,消除了齿槽转矩,降低了铜损。三相绕组分为两层结构,端部铜线排列规则,厚度与中心部分一致,减小电机端部径向厚度。使用高导热率的环氧树脂固定定子绕组,有效解决了线圈发热问题,同时起到对电机绕组固定作用,避免了电磁振动与噪声。
Description
技术领域
本发明涉及医疗器械技术领域,具体涉及一种用于植入式轴流血泵的无槽电机。
背景技术
目前,轴流血泵是一种部分或全部替代心脏泵血功能的机械泵装置,具有广阔的临床应用前景。驱动电机作为人工心脏泵的重要组成部分,其特性直接决定着轴流血泵的性能。轴流血泵驱动电机与传统电机相比,要求在满足高可靠性、高稳定性基础上,减小体积、降低噪声、改善运行性能。永磁无刷直流电动机具有功率密度大、几何尺寸小、动态响应快、运行效率高等一系列优点,在高速运行场合具有广阔的应用前景,目前已经被广泛应用于轴流血泵的驱动。
传统永磁无刷直流电动机存在转矩脉动会导致振动和噪声的产生,影响系统的控制精度,尤其是在高速运转电机中,转矩脉动的影响更为严重。永磁无刷直流电动机的转矩脉动主要源于其谐波转矩,谐波转矩包括齿槽转矩和纹波转矩。前者由定子铁心与转子永磁体相互作用产生,是定子齿槽存在而导致的铁心磁阻变化引起;后者产生于电枢电流波形及感应电动势波形的偏差。关于永磁无刷直流电动机转矩脉动的削弱,相关文献进行了深入研究,取得了一定的研究成果。通过优化削角永磁体、定子开辅助槽、调整定子齿槽宽度,选择分数槽绕组,合适的槽极配合及优化极弧系数等办法削弱转矩脉动。
现有传统直流无刷电机的线圈的绕组端部置于定子边缘外,排列不规则,厚度高,占用空间较大,同时无法有效利用绕组端部部分,增大了电机的漏磁和铜损,降低了电机的转动力矩;传统电机的定子为有齿槽结构,转矩脉动较大。
发明内容
本发明的目的是提供一种用于植入式轴流血泵的无槽电机,它采用无槽结构的永磁无刷直流电动机,定子绕组采用六边形结构,利用高导热环氧树脂将定子线圈固化,定子铁心采用高磁导率硅钢片冲压而成,转子采用高磁能积钕铁硼圆柱形转子,具有转矩波动小、运行平稳、噪声低、电枢电感小和定位干扰力矩小等一系列优点。
为实现上述目的,本发明采取以下技术方案:
一种用于植入式轴流血泵的无槽电机,它包括有定子铁心、定子绕组、转子转轴、转子永磁体,其特征在于:定子铁心由圆环形硅钢片轴向冲压而成,转子永磁体为永磁材料,径向充磁,该定子绕组的线圈介于定子铁心和转子转轴之间,定子绕组粘贴在圆桶形的定子铁心内壁上,定子铁心为无齿槽结构。
其中,定子绕组的两边边缘与定子铁心边缘平齐,定子绕组由A、B、C三相绕组组成,三相绕组对称均匀分布成两层,每匝线圈跨过一个极距,每层每相绕组占据120°的角度,每相线圈包含内层绕组120°和外层绕组120°。
其中,三相绕组接线方式为星形连接。
其中,定子绕组沿轴向分为三个部分:两端部绕组线为向内倾斜,中段绕组部分与转子转轴的轴向平行。
其中,定子绕组的单圈线圈为枣胡形的中心对称的六角形结构,中段线圈部分与转子转轴的轴向平行,是两部分为中段部分,两侧端部分与转子转轴的轴向成一定角度向内倾斜,中段部分与两端部分绕组均为两层结构,其中,内侧端部分为内层绕组,外侧端部分为外层绕组。
其中,定子绕组使用高导热率的环氧树脂固定在定子铁心的内壁上。
本发明采用直流无刷无槽的结构,消除了齿槽转矩,降低了铜损。三相绕组分为两层结构,端部铜线排列规则,厚度与中心部分一致,减小电机端部径向厚度。使用高导热率的环氧树脂固定定子绕组,有效解决了线圈发热问题,同时起到对电机绕组固定作用,避免了电磁振动与噪声。
本发明具有以下有益效果:
(1)定子结构简单,与传统有槽电机结构相比,定子变为无槽结构,加工制作相对简单,消除了齿槽转矩,铜损降低。
(2)定子无槽结构可以使定子硅钢与转子永磁体之间气隙径向长度减小,气隙磁感应强度增大,从而使电机的效率增加,减小发热量。
(3)使用高导热率的环氧树脂固定定子绕组,有效解决了线圈发热问题,同时起到对电机绕组固定作用,避免了电磁振动与噪声。
(4)三相双层定子绕组采用六角形结构,使得电动机的转矩脉动得到了有效抑制,削弱了振动和噪声,可以提高轴流血泵系统的控制精度,有利于轴流血泵的稳定运行。
(5)电机定子绕组的端部采倾斜设计,使用端部与中部绕组的径向厚度一致,有效减小了电机的直径,有利于轴流血泵的小型化与植入。
附图说明
图1是本发明的结构示意图。
图2是本发明的单圈定子绕组示意图。
具体实施方式
参见图1、图2所示:一种用于植入式轴流血泵的无槽电机,它包括有定子铁心1、定子绕组2、转子转轴6、转子永磁体5,定子铁心1由圆环形硅钢片轴向冲压而成,转子永磁体5为永磁材料,径向充磁,该定子绕组2的线圈介于定子铁心1和转子转轴6之间,定子绕组2粘贴在圆桶形的定子铁心内壁上,定子铁心1为无齿槽结构。
定子铁心由硅钢片组成,硅钢片采用冷轧硅钢片,相对于热轧硅钢片,其优点是电机磁滞损耗小,使电机效率提高。多片硅钢片沿轴向冲压,形成定子铁心1。
其中,定子绕组的两边边缘与定子铁心边缘平齐,定子绕组由A、B、C三相绕组组成,三相绕组对称均匀分布成两层,每匝线圈跨过一个极距,每层每相绕组占据120°的角度,每相线圈包含内层绕组120°和外层绕组120°。
其中,三相绕组接线方式为星形连接。
其中,定子绕组沿轴向分为三个部分:两端部绕组线为向内倾斜,中段绕组部分与转子转轴的轴向平行。
其中,定子绕组的单圈线圈为枣胡形的中心对称的六角形结构(见图2所示),中段线圈部分02、05与转子转6的轴向平行,是两部分为中段部分,两侧端部分01、03、04、06与转子转轴6的轴向成一定角度向内倾斜,中段部分与两端部分绕组均为两层结构,其中,内侧端部分01、03为内层绕组,外侧端部分04、06为外层绕组。而有槽电机的绕组,绕组的端部布置在转子边缘之外,端部铜线排列不规则,径向厚度高,不利于轴流血泵植入。本发明的无槽电机的定子绕组,定子绕组轴向长度与定子铁心相同,定子绕组两端部分厚度与中段绕组厚度相同,减小了心脏泵径向尺寸,有利于植入。
其中,定子绕组使用高导热率的环氧树脂固定在定子铁心的内壁上,高导热率的环氧树脂充满线圈空隙,并与定子硅钢粘结在一起。该结构有效解决了线圈发热问题,同时起到对电机绕组固定作用,避免了电磁振动与噪声。
以上所述是本发明的较佳实施例及其所运用的技术原理,对于本领域的技术人员来说,在不背离本发明的精神和范围的情况下,任何基于本发明技术方案基础上的等效变换、简单替换等显而易见的改变,均属于本发明保护范围之内。
Claims (6)
1.一种用于植入式轴流血泵的无槽电机,它包括有定子铁心、定子绕组、转子转轴、转子永磁体,其特征在于:定子铁心由圆环形硅钢片轴向冲压而成,转子永磁体为永磁材料,径向充磁,该定子绕组的线圈介于定子铁心和转子转轴之间,定子绕组粘贴在圆桶形的定子铁心内壁上,定子铁心为无齿槽结构。
2.根据权利要求1所述的一种用于植入式轴流血泵的无槽电机,其特征在于:定子绕组的两边边缘与定子铁心边缘平齐,定子绕组由A、B、C三相绕组组成,三相绕组对称均匀分布成两层,每匝线圈跨过一个极距,每层每相绕组占据120°的角度,每相线圈包含内层绕组120°和外层绕组120°。
3.根据权利要求2所述的一种用于植入式轴流血泵的无槽电机,其特征在于:三相绕组接线方式为星形连接。
4.根据权利要求3所述的一种用于植入式轴流血泵的无槽电机,其特征在于:定子绕组沿轴向分为三个部分:两端部绕组线为向内倾斜,中段绕组部分与转子转轴的轴向平行。
5.根据权利要求4所述的一种用于植入式轴流血泵的无槽电机,其特征在于:定子绕组的单圈线圈为枣胡形的中心对称的六角形结构,中段线圈部分与转子转轴的轴向平行,是两部分为中段部分,两侧端部分绕组与转子转轴的轴向成一定角度向内倾斜,中段部分与两端部分绕组均为两层结构,其中,内侧部分为内层绕组,外侧部分为外层绕组。
6.根据权利要求5所述的一种用于植入式轴流血泵的无槽电机,其特征在于:定子绕组使用高导热率的环氧树脂固定在定子铁心的内壁上。
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