【作者】 王虎；

【导师】 刘淑琴；

【作者基本信息】 山东大学 ， 电工理论与新技术， 2017， 硕士

【摘要】 心力衰竭是当今世界共同面临的一个难题,人工心脏泵的出现为心力衰竭的治疗提供了一条有效的途径。磁悬浮技术凭借其无接触无摩擦的优点被广泛应用到各个领域。磁悬浮人工心脏泵发展迅速,可以解决机械轴承心脏泵存在的溶血和血栓问题,增加心脏泵的使用寿命和稳定性。人工心脏泵正常工作需要驱动电机提供动力,两者的性能和参数直接相关,人工心脏泵作为植入式医疗器械,对驱动电机的体积、效率要求极为严格。本课题基于国内外的研究情况,设计了一种磁液混合悬浮、体积小、泵机一体化的直驱型轴流式人工心脏泵,研制了适用于人工心脏泵的新型永磁无刷直流电机及其控制器,电机定子采用无槽结构,尽可能增大了叶轮的布置空间,实验表明,所研制的驱动电机基本满足人工心脏泵的指标要求。本文首先综述了人工心脏泵及其驱动系统的发展历史、现状和趋势,详细介绍了国内外先进的心脏泵产品,阐述了永磁无刷直流电机的工作原理和数学模型,并重点介绍了无槽电机的特点和电磁特性,在此基础上,提出了本论文所采用的研究方法。本文从经典磁路计算和有限元仿真两个方面对电机参数进行了设计和优化。在磁路计算中,针对无槽电机的特殊结构,对传统磁路计算的公式进行了修正,提高了磁路设计的计算精度。使用Ansoft软件对无槽无刷直流电机进行建模仿真,重点分析了驱动电机的静态磁场分布、带载起动特性和额定损耗等问题。本文的设计方法将磁路计算的快速和有限元仿真高精度的特点相结合,设计并制造了满足人工心脏泵要求的驱动电机。在驱动控制部分,选用MicroLinear公司生产的无刷直流电机驱动与控制专用集成电路ML4435,采用无传感器控制方法,降低了控制难度和心脏泵的体积,实现了电机本体的驱动控制,调速范围宽。最后对本课题研制的电机本体及其驱动控制系统,进行了实验调试,使用磁悬浮轴承的驱动电机能够实现无接触、无摩擦的稳定运行,电机转速与外加电压之间呈严格的正比关系,实验数据达到了人工心脏泵的要求。更多还原

【Abstract】 The treatment of heart failure is a common problem in the world today.The appearance of artificial heart pump provides an effective way for patients.Magnetic levitation technology has been widely used in various fields because of its advantages of non-contact and friction free.Maglev artificial heart pump has developed rapidly.It can solve the problem of hemolysis and thrombosis caused by the mechanical bearing and increase the service life and stability of the heart pump.Drive motor is the power source for artificial heart pump,and its performance directly determines the parameters of the artificial heart pump.Because artificial heart pump is the implantable medical devices,the drive motor must have the advantages of small volume,high efficiency and low power consumption.This subject is based on the research situation at home and abroad.A small size heart pump with permanent magnetic bearing and axial fluid-film bearings is designed.The axial heart pump adopt direct-drive system.A new type of permanent magnet brushless DC motor and its controller were developed for the heart pump.The motor stator is slotless structure,as far as possible to increase the space of impeller.Experiments show that the drive motor can meet the requirements of the performance index of heart pump.First,this paper summarizes the background,status and development trend of the artificial heart pump and its drive system.The advanced heart pump products at home and abroad are introduced is expounded.The characteristic and electromagnetic characteristics of slotless motor are mainly introduced.On this basis,the research method in this paper is put forward.In this paper,the parameters of the motor are designed and optimized from two aspects:the classical magnetic circuit calculation and the finite element simulation.In the magnetic circuit calculation,according to the special structure of the slotless motor,the formula of the traditional magnetic circuit calculation is modified to improve the calculation precision of the magnetic circuit design.By using the method of combining field and circuit,the magnetic field distribution,starting characteristic and loss of the motor are simulated with Ansoft finite element simulation software.The fast of magnetic circuit calculation and the high precision of finite element simulation are combined in this paper.A drive motor is designed and manufactured to meet the requirements of the heart pump.In the drive control part,Control ASIC ML4435 produced by MicroLinear Company is applied.Using sensorless control method reduce the difficulty of control and controller volume.The drive control of the motor and wide-range speed governing realized.At last,the heart pump and controller were developed successfully and its experimental study was carried out.The experimental results show that the system can achieve stable closed-loop operation,it also has the advantages of smooth rotation,low noise,and strong anti-jamming capability.According to the speed curve which is like a straight line,the system can meet the requirements of the performance index of heart pump.更多还原