磁悬浮人工心脏血泵电机及其控制系统研究

Heart disease is a frequent disease for middle and old age people, and myocardium adynamia is the important factor of conducing to death. Heart transplant is the only effective method for late myocardium adynamia. People lay hope on artificial heart development due to the shortness of the hearts for transplant. The main part of the artificial heart is a blood pump. Bearing wear and thrombosis are the two problems to be solved for long time running of the blood pump motor. Adoption of blood pump with magnetic suspension is the received opinion to solve the above problems. Researchers of many countries, such as U.S., Japan and German and so forth, pay attention to the investigation of blood pump with magnetic suspension for many year, however, the magnetic suspension blood pump for practical application has not been developed due to the complicated control technique. .The study of this project supported by the NSFC has gained some important achievements as follows:.① The magnetic suspension force model of beringless motor is first put forward based on the field-circuit coupling analysis, in which the eccentricity of the airgap between rotor and stator of the motor is taken into account. A digital control system based on DSP and CPLD for dynamic rotor displacement detection and magnetic levitation control of bearingless motor has been designed, built and tested. .② A novel bearingless motor with hybrid rotor structure of permanent magnet and core rotor, which has the both advantages of PM rotor and induction rotor bearingless motors, is proposed. A new decoupling control strategy of magnetic suspensin forces for the proposed bearingless motor is put forward based on the current vector control theory. The exactitude and feasibility of the proposed design and control approach have been verified by the tested result of the prototype machine. A invention patent application has been made. .③ An axially controllable disk-type blood pump motor with passive and active magnetic bearings has been proposed and patented. The magnetic suspension of the new structure blood pump is needed to be controlled only in the axial direction..④ A new type of blood pump with dual passive magnetic bearings and impellers has been designed and built. The rotor can be self magnetically suspended and does not need to be controlled. This new blood pump will be much easily used for artifical heart application due to its simple control requirement. .8 papers based on the study of this project have been published, and 3 and 5 in which have been retrieved by the EI and ISTP respectively. Other 2 papers are going to be published. .

目前治疗晚期心肌衰竭的唯一有效方法是心脏移植，由于供体心脏的奇缺，因此人工心脏成为国内外的研究热点。本项目研究的是人工心脏的一项关键技术，即高效高力能密度免维护的人工心脏电机及其控制技术。该电机采用磁悬浮结构，定转子兼作磁力轴承，电机的旋转力矩与磁悬浮力采用一体化实时控制。该项研究具有重大的科学意义与应用价值。