| Because of the high incidence of heart disease and the shortage of donor organs,the development of artificial heart has been a research hotspot in recent years.At present,the energy supply mode of artificial heart is mainly through the skin cable,but because of the wire through the skin,it is easy to cause postoperative infection and human exclusion.There is no wire or conduit connection in wireless energy transmission mode,which can avoid the problem of percutaneous wire infection.Therefore,wireless energy transmission mode is more and more concerned by relevant researchers.With the development of magnetic driving technology,magnetic technology can be used to drive blood pump non-contact.However,although the current magnetic driven blood pump can realize the contactless energy transfer of permanent magnet,the magnetic flux leakage effect of permanent magnet is serious,and there are some problems such as low utilization efficiency and low transfer torque.In order to solve the above problems,this paper proposes a magnetic driven blood pump based on the principle of magnetic modulation.The magnetic field generated by the permanent magnet is modulated by a salient iron plate,which reduces the magnetic leakage phenomenon and improves the utilization efficiency of the permanent magnet.The medium and low speed rotor of the magnetic driven blood pump removes the permanent magnet,which is composed of salient iron and back iron,making the pump body lighter and easier to maintain and replace.Firstly,based on the principle of magnetic field modulation,this paper analyzes the movement mode of magnetic gear,and proposes a magnetic gear structure suitable for external magnetic drive blood pump.Then,based on the basic principle of electromagnetic field finite element analysis,the simulation model is built based on ANSYS,and the torque performance under different transmission ratios is analyzed.By simultaneous interpreting the influence of internal rotor permanent magnet,permanent magnet ring permanent magnet,outer rotor salient pole iron and back iron parameters on torque,the magnetic circuit structure of magnetic regulating magnetic pump is optimized.Secondly,the torque characteristics,magnetic field distribution,eddy current loss and other transmission performance of the magnetic driven blood pump are analyzed,and the influence of different gap distance on the torque and magnetic field is analyzed,which verifies the feasibility of contactless transmission of the magnetic driven blood pump.Finally,a comprehensive blood pump test-bed is designed,and the blood pump and its water circulation circuit are installed to make the blood pump carry out water pumping test.Through the measurement of parameters such as flow,pressure,load torque and spatial magnetic flux density of the magnetic driven blood pump,the effectiveness of the proposed magnetic driven blood pump is verified by comparing with the simulation results. |
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