一种磁悬浮离心式心脏泵刚度与阻尼特性分析  

Study on Stiffness and Damping of a Centrifugal Maglev Blood Pump

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作  者:李波[1] 孙传余[1] 文艺成 丁鸿昌[1] 

机构地区:[1]山东科技大学机械电子工程学院,山东青岛266590

出  处:《机械与电子》2015年第12期27-30,共4页Machinery & Electronics

基  金:山东省优秀中青年科学家科研奖励基金项目(BS2013NJ015);黄岛区科技项目(2014-1-39)

摘  要:针对一种磁悬浮离心式心脏泵系统的动态特性,需要分析其刚度与阻尼。为此,分析了径向永磁轴承和开关磁阻电机的径向力学特性,得到磁悬浮转子径向运动方程和控制系统框图;并结合PD控制器,推导出系统径向刚度与阻尼数学表达式,最后通过实例仿真,得到径向刚度与阻尼特性曲线。研究表明,比例和滤波环节对系统动刚度、阻尼比和固有频率均有显著影响,且在低频段,微分系数与阻尼比近似成正比关系。上述研究为磁悬浮离心式心脏泵控制系统的设计和磁悬浮转子径向位移控制提供理论指导。The stiffness and damping of the dynamic characteristics of a centrifugal maglev blood pump,needs to be analyzed.To this end,the equation of radial motion and block diagram of control system about the maglev rotor are provided,according to the study on mechanical characteristics of radial permanent magnetic bearings and switched reluctance motors.And the mathematical expressions of radial stiffness and damping about the maglev system are deduced by combining block diagram of control system and PD controller.Finally,through the simulation example,the characteristic curves of radial stiffness and damping are presented.Studies have shown that dynamicstiffness coefficients,damping ratio and natural frequency are obviously affected by the link of proportion and filter and derivative coefficient is approximately proportional to damping ratio on low-frequency stage.The study provides theoretical guidance for designing the control system of the centrifugal maglev blood pump and radial displacement control of maglev rotor.

关 键 词:磁悬浮心脏泵 径向永磁轴承 开关磁阻电机 刚度 阻尼 

分 类 号:TH133.3[机械工程—机械制造及自动化] R318.11[医药卫生—生物医学工程]

 

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