The electromagnetic torque and eddy current loss analysis of the non-contact driving device of artificial heart

In this paper, we analyze and calculate the magnetic field and eddy current distribution and electromagnetic torque characteristics and eddy current loss of permanent magnet of the non-contact driving device for the blood pump of artificial heart using finite element method. Through the analysis, we know that the driving device can deliver the enough torque when the spacing distance between the active and the passive magnet axis is 120 mm. This torque fully meets the energy transfer request of artificial heart blood pump. By comparing the calculating results of magnetostatic field and time-dependent magnetic field, we know that the influence of the eddy current on the electromagnetic torque can be ignored in normal working of non-contact driving device. This research on the driving characteristics of the non-contact permanent magnet power transmission system has laid a theoretical foundation for the optimal design of an artificial heart with the permanent magnet driving device. In addition, the research´s findings can also be used for the reference of other non-contact permanent magnet gear drive problems.