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An initial investigation of insulation fault effects on LVAD motor performance

机译:绝缘故障对LVAD电机性能的影响的初步调查

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Thousands of patients suffering from congestive heart failure (CHF) benefit from safe and reliable, temporary left ventricular assist devices (LVAD). Designed to perform in parallel with the left ventricle of the native heart, there are only five devices in the United States approved for use of up to 2 years to support CHF patients until a donor heart becomes available, or the heart recovers some function. With limited donor hearts (/spl sim/3000), fully implantable LVADs are currently being designed for up to 10 years and are a complex medical device with multiple subsystems. The permanent magnet, brushless DC (BLDC) motor subsystem is evaluated for insulation failures using simulations of the electrical circuit model in MatLab (Mathworks). Variations in the number of turns lost and groundwall insulation have a direct effect on the current available to drive the motor. This preliminary model provides results that support the hypothesis that LVAD insulation failures lead to poor pump performance, and potentially, pump failure.
机译:成千上万的患有充血性心力衰竭(CHF)的患者受益于安全可靠的临时左心室辅助设备(LVAD)。设计为与天然心脏的左心室平行运行,在美国只有五种设备可以使用长达2年的时间来支持CHF患者,直到有供体心脏可用或心脏恢复某些功能为止。由于供体心脏有限(/ spl sim / 3000),目前可植入的LVAD的设计长达10年之久,是具有多个子系统的复杂医疗设备。使用MatLab(Mathworks)中的电路模型仿真评估永磁无刷直流(BLDC)电机子系统的绝缘故障。损耗匝数和接地绝缘的变化会直接影响可用于驱动电动机的电流。该初步模型提供的结果支持以下假设:LVAD绝缘故障会导致泵性能下降,并有可能导致泵故障。

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