Development of a precise controller for an electrohydraulic total artificial heart. Improvement of the motor's dynamic response

ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs
J M AhnB G Min

Abstract

In an electrohydraulic total artificial heart developed at the National Cardiovascular Center (Osaka, Japan), two blood pumps are pushed alternatively by means of the bidirectional motion of a brushless DC motor for pump systole and diastole. Improvement in the dynamic response of the motor is very important to obtain better pump performance; this was accomplished by using power electronic simulation. For the motor to have the desired dynamic response, it must be commutated properly and the damping ratio (zeta), which represents transient characteristics of the motor, must lie between 0.4 and 0.8. Consequently, all satisfactory specifications with respect to power consumption must be obtained. Based on the simulated results, the design criteria were determined and the precise controller designed to reduce torque ripple and motor vibration, and determine motor stop time at every direction change. In in vitro tests, evaluation of the controller and dynamic response of the motor was justified in terms of zeta, power consumption, and motor stop time. The results indicated that the power consumption of the controller and the input power of the motor were decreased by 1.2 and 2.5 W at zeta = 0.6, respectively, compared to the previou...Continue Reading

Citations

Jul 10, 2013·Artificial Organs·Byoung Goo Min
Dec 8, 2000·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·I M SauerE S Bücherl

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