Optimization of Hemolytic Performance for Blood Pump Based on Temperature Field Analysis and Three Control Strategies

Abstract

Blood pumps are the most important medical devices for treating heart failure. Haemolysis is an important factor affecting the performance of blood pumps. Excessive temperatures can damage red blood cells, thereby reducing blood compatibility. To solve the problem of haemolysis caused by temperature increase in an electromagnetic suspended blood pump, the influence of temperature increase in an electromagnetic suspended blood pump motor was studied. First, an electromagnetic levitation blood pump model and a mathematical model of the temperature field were established. Subsequently, the influences of two key factors (stator winding phase resistance and blood pump speed) on the overall temperature increase of the electromagnetic levitation blood pump were explored. Finally, based on the law of temperature increase, a temperature optimisation scheme for the motor of an electromagnetic levitation blood pump was proposed. The results show that, on the one hand, the temperature rise of the electromagnetic levitation blood pump can be effectively reduced by properly reducing the stator winding phase resistance and rotating speed. Conversely, optimising commutation and controllers can further reduce the temperature rise. This method can be used as a guide for the optimal design of blood pumps.