Key result
A hybrid magnetic bearing system with force balance control significantly reduced bearing current and maintained power consumption below 0.5 W under various thrust loads.
A novel hybrid magnetic bearing system for a rotary centrifugal blood pump demonstrated low power consumption (<0.5 W) and reduced bearing current in experimental validation.
May guide low-power bearing designs in centrifugal pumps; leaves open translation to clinical ventricular assist devices.
A hybrid magnetic bearing system was designed for a rotary centrifugal blood pump being developed to provide long-term circulatory support for heart failure patients. This design consists of two compact bearings to suspend the rotor in five degrees-of-freedom with single axis active control. Permanent magnets are used to provide passive radial support and electromagnets to maintain axial stability of the rotor. Characteristics of the passive radial and active thrust magnetic bearing system were evaluated by the electromagnetic finite element analysis. A proportional-integral-derivative controller with force balance algorithm was implemented for closed loop control of the magnetic thrust bearing. The control position is continuously adjusted based on the electrical energy in the bearing coils, and thus passive magnetic forces carry static thrust loads to minimize the bearing current. Performance of the magnetic bearing system with associated control algorithm was evaluated at different operating conditions. The bearing current was significantly reduced with the force balance control method and the power consumption was below 0.5 W under various thrust loads. The bearing parameters predicted by the analysis were validated by the experimental data.
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Jahanmir et al. (2009) studied Heart failure. Hybrid magnetic bearing system for a rotary centrifugal blood pump was evaluated on Power consumption and bearing current. A hybrid magnetic bearing system with force balance control significantly reduced bearing current and maintained power consumption below 0.5 W under various thrust loads.