膀胱动力泵电磁驱动单元的建模与仿真

Modeling and Simulation for the Electromagnetic Drive Unit of Bladder Power Pump

研究膀胱动力泵电磁驱动单元的电磁驱动特性,针对体外辅助膀胱排尿系统,为了优化性能,提出了利用等效磁荷法建立膀胱动力泵电磁驱动单元数学模型。将电磁铁和永磁体分别看成等效磁荷,建立以磁荷间库伦作用力表示电磁驱动力的电磁驱动单元模型。模型的电磁铁电流、永磁体间距、永磁体数量、永磁体与电磁铁间角度等主要因素对膀胱动力泵电磁驱动能力有影响。在Matlab平台上仿真,结果表明,可提高膀胱动力泵的电磁驱动能力。改进的模型具有建模简单,计算速度快及求解精度较高等特点,可为膀胱动力泵的设计和分析提供依据和有效手段。

To study the electromagnetic driving characteristics of the electromagnetic drive unit of bladder power pump, a new method to establish the mathematics model of electromagnetic drive unit of blader power pump is proposesd using Equivalent Magnetic Charge. The electromagnet and permanent magnet（PM） in the electromagnetic drive unit are regarded as equivalent magnetic charges respectively. The electromagnetic force between electromagnet and PM is represented using the Kulun force bewteen the charges. Based on the established model, the main influence factors acting on the driving capability of the electromagnetic drive unit, such as the electromagnet current, the inter- val size between each PM, the numbers of PM and the angle between PM and electromagnet, are analyzed on the Matlab platform. The simulation results show that the driving capability is enhanced by increasing the electromagnet current and the numbers of PM, or by reducing the interval size between each PM, and the angle between PM and e- lectromagnet. Compared with the model of Finite Element Analysis, the established model has the properties of con- venient modeling, quick computation and high calculation accuracy. The research provides the beneficial guidance and means for the design and analysis of bladder power pump.