• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.873-875
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• 2002

본 논문에서는 Magnetic Yoke를 이용, 자기저항을 최소화하여 관내의 자기장을 증가시키고, 또한 펌핑 압력을 증가시킨 Linear Pump를 설계하고 제작하였다. Magnetic Fluid Linear Pump는 직경 12mm인 관에 적용할 수 있도록 설계하였으며 Magnetic Yoke는 두께 0.5mm 규소강판을 적층하여 사용하였으며, Coil은 1000 Tum으로 하여 기자력을 발생시켰다. Pump의 동작 특성을 분석하기 위하여 제작된 Magnetic fluid Lineal Puup의 내부 자기장을 측정하였으며, 인가된 자기장에 의하여 형성되는 Magnetic Fiuld의 형상을 측정하였다.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.51 no.10
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• pp.477-482
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• 2002

One of the key technologic requirements for rotary blood pumps is the sealing of the motor shaft. A mechanical seal, a journal bearing, magnetic coupling, and magnetic suspension have been developed, but they have drawbacks such as wear, thrombus formation, and power consumption. A magnetic fluid seal is durable, simple, and non power consumptive. Long-term experiments confirmed these advantages. The seal body was composed of a Nd-Fe-B magnet and two pole pieces; the seal was formed by injecting magnetic fluid into the gap (50${\mu}m$) between the pole pieces and the motor shaft. To contain the ferro-fluid in the seal and to minimize the possibility of magnetic fluid making contact with blood, a shield with a small cavity was attached to the pole piece. While submerged in blood, the sealing pressure of the seal was measured and found to be 31kPa with magnetic fluid LS-40 (saturated magnetization, 24.3 KA/m) at a motor speed of 10,000 rpm and 53kPa under static conditions(0mmHg). The specially designed magnetic fluid seal for keeping liquids out is useful for axial flow blood pumps. The magnetic fluid seal was incorporated into an intra-cardiac axial flow blood pump.