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In this paper, a double-stator tubular PM (DSTPM) motor has been newly proposed, which has two tubular stators and one tubular mover. The magnetic circuits of the inner stator and the outer stator are in series, thus reducing the motor radial length. As a result, the motor volume can be saved, and the motor force capability can be improved. Its topology and electromagnetic performance are presented...
In order to satisfy the special requirements of the artificial heart pump designed by brushless DC motor, this paper presented a pulsating control system which can mimic the rhythm beating of the natural heart. It was modeled and simulated by adapting an intelligent algorithm of neural network PID. The results proved that, neural network PID control could effectively solve the problem that the parameters...
Implanted total artificial hearts (TAHs) is becoming a main therapy for the heart failure patients. Instead of the nature hearts, the reliability of the TAHs is very important to the security of human life. To improve the fault-tolerance of the TAHs, this paper proposes a new tubular fault-tolerant permanent-magnet motor, termed as the dual-channel linear oscillating actuators (DC-LOAs), for total...
The axial blood pump requires the pulsation flow, resulting in difficulty and complexity of the controller. This paper proposed a new control strategy of brushless permanent-magnet (PM) motors. By using software control cycle changes, the motor speed pulsing flow effects is implemented, in which the fuzzy control strategy is adopted. A MATLAB-based simulation model is developed to compare the performance...
Three passive magnetic bearings developed by the authors have been applied to the impeller blood pumps. The measuring system with hall sensors is built for determination of the maximal rotor eccentric distances in the pumps. The results show that when the rotating speed exceeds 4000rpm and the mass flow rate exceed 4 L/min, magnetic levitations can be achieved in the rotor with I-type bearing because...
The invasive model of power supply for the commercial blood pumps has brought great discomfort to the patients. An inductive power transmission system based on transformer for blood pumps has been designed and developed. The system is mainly consist of power supply, control circuit of switch, transformer, rectifier circuit and energy storage element. Experiments on power transmission in the system...
The long-term clinical use of blood pumps is dependent on the bio-compatibility. Blood trauma especially hemolysis is closely related to the flow fields in the pumps according to the homodynamic. Computational fluid dynamics technique has been used to visualize the flow patterns and distribution of shear stress in two pumps with different impeller designs and to evaluate the hemolysis level. After...
An implantable aortic valve-pump was designed. There were a central rotor and a stator in the device. The rotor was consisted of driven magnets and an impeller, the stator was consisted of a motor coil with an iron core, an inducer and a diffuser. This pump has promisingly better antithrombogenicity than other heart pumps, for neither connecting conduits nor “bypass” circuits are necessary, which...
Particle image velocimetry with out-trigger synchronization system developed by the authors was applied to investigate the flow patterns and hemo-compatibility in the blood pumps. The results showed that: the particle image velocimetry with outer trigger realized the continuous sample of velocity in one flow path in the pumps; both the absolute velocity and relative velocity varied with impeller design,...
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